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Projection type display, a display and a drive method thereof Number:7,136,035 from the United States Patent and Trademark Office (PTO) owispatent

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Title: Projection type display, a display and a drive method thereof

Abstract: A projection type display is provided that can change a quantity of light emitted to a light modulation device without changing the intensity of light emission from a lamp and exhibits superiority in an image expression and adaptability to an operational environment. This includes an illumination device, a liquid crystal light valve modulating light emitted from the illumination device and a projection lens projecting light modulated by the liquid crystal light valve. This illumination device is provided with a light source and a fly-eye lens, making illumination distribution of light incident from the light source uniform and a liquid crystal element for light adjustment, which is disposed on an optical axis of light emitted from the light source and adjusts a quantity of light emitted from the light source. Hence, a quantity of light per unit time emitted from the illumination device is adjustable by driving a liquid crystal element for light adjustment with the time-sharing based on information from outside.

Patent Number: 7,136,035 Issued on 11/14/2006 to Yoshida


Inventors: Yoshida; Shohei (Nagano, JP)
Assignee: Seiko Epson Corporation (Tokyo, JP)
Appl. No.: 10/310,043
Filed: December 5, 2002


Foreign Application Priority Data

Dec 11, 2001 [JP] 2001-377828
Dec 17, 2001 [JP] 2001-383721

Current U.S. Class: 345/87 ; 345/32; 348/751; 353/31
Current International Class: G09G 3/36 (20060101)
Field of Search: 345/32,87 348/743,751 353/31,20,38 349/8


References Cited [Referenced By]

U.S. Patent Documents
5631665 May 1997 Takizawa et al.
6120152 September 2000 Nakayama et al.
6683657 January 2004 Miyawaki
6943756 September 2005 Choi
Foreign Patent Documents
A-3-179886 Aug., 1991 JP
U 04-006037 Jan., 1992 JP
A 04-199123 Jul., 1992 JP
405224155 Sep., 1993 JP
A 05-333323 Dec., 1993 JP
A 07-123342 May., 1995 JP
A 08-095515 Apr., 1996 JP
A 09-105907 Apr., 1997 JP
2001-228569 Apr., 2001 JP
A 2001-100689 Apr., 2001 JP
A 2001-100699 Apr., 2001 JP
A 2001-142048 May., 2001 JP
A 2001-264728 Sep., 2001 JP
A 2003-107422 Apr., 2003 JP
Primary Examiner: Liang; Regina
Attorney, Agent or Firm: Oliff & Berridge, PLC

Claims



The invention claimed is:

1. A projection type display, comprising: an illumination device; a light modulation device that modulates light emitted from the illumination device; and a projection device that projects light modulated by the light modulation device; the illumination device being provided with a light source, a uniform illumination device making a distribution of illumination of light incident from the light source uniform, and a liquid crystal element for light adjustment, installed on an optical axis of light emitted from the light source, for adjusting the flux of light emitted from the light source, a flux of light emitted from the illumination device per unit time is adjustable by driving the liquid crystal element for light adjustment with time-sharing between a high transmittance ratio and a low transmittance ratio in response to information from outside, and a signal applied to the light modulation device being changed based on a signal supplied to the liquid crystal element for light adjustment, such that color tone being changed by the liquid crystal element for light adjustment, the changed color tone of light emitted from the liquid crystal element for light adjustment being correctable by the light modulation device.

2. The projection type display according to claim 1, the illumination device being provided with two fly-eye lenses composed of a first fly-eye lens and a second fly-eye lens arranged in order from the side nearest to the light source along the optical axis.

3. The projection type display according to claim 1, the illumination device being a rod state light guide body dividing light form the light source into a plurality of light fluxes by using reflection and emitting them.

4. The projection type display according to claim 1, further comprising: a control signal determination device that determines a control signal to control the liquid crystal element for light adjustment based on an image signal; and a light adjustment control device controlling the liquid crystal element for light adjustment based on the control signal.

5. The projection type display according to claim 1, further comprising: a light modulation control signal determination device that determines a control signal to control the light modulation device based on the control signal that controls the liquid crystal element for light adjustment; and a light modulation control device that controls the light modulation device based on the control signal determined by the light modulation control signal determination device.

6. A projection type display, comprising: an illumination device; a light modulation device that modulates light emitted from the illumination device; and a projection device that projects light modulated by the light modulation device; the illumination device being provided with a light source, a uniform illumination device making a distribution of illumination of light incident from the light source uniform, and a liquid crystal element for light adjustment, installed on an optical axis of light emitted from the light source, for adjusting the flux of light emitted from the light source, a flux of light emitted from the illumination device per unit time is adjustable by driving the liquid crystal element for light adjustment with time-sharing between a high transmittance ratio and a low transmittance ratio in response to information from outside, and a period of applying voltage to the light modulation device being changed based on a signal supplied to the liquid crystal element for light adjustment such that color tone being changed by the liquid crystal element for light adjustment, the changed color tone of light emitted from the liquid crystal element for light adjustment being correctable by the light modulation device.

7. A method of driving a projection type display including a liquid crystal element for light adjustment and a light modulation device, comprising: adjusting a flux of light emitted from an illumination device with time-sharing between a high transmittance ratio and a low transmittance ratio; and projecting the light; a control signal to control the liquid crystal element for light adjustment being determined based on an image signal, and the liquid crystal element for light adjustment is controlled based on the control signal such that a quantity of light irradiated to a light modulation device is adjusted; and the control signal to control the liquid crystal element for light adjustment being determined based on the image signal, and the liquid crystal element for light adjustment is controlled based on the control signal such that a flux of light irradiated to the light modulation device is adjusted, while a control signal to control the light modulation device is determined based on the control signal to control the liquid crystal element for light adjustment, and the light modulation device is controlled based on the control signal such that color tone being changed by the liquid crystal element for light adjustment, the changed color tone of light emitted from the liquid crystal element for light adjustment being corrected by the light modulation device.

8. A display, comprising: an illumination device; and a light modulation device that modulates light emitted from the illumination device; the illumination device being provided with a light source, a uniform illumination device making a distribution of illumination of light incident from the light source uniform, and a liquid crystal element for light adjustment, installed on an optical axis of light emitted from the light source, to adjust the intensity of light emitted from the light source, a flux of light emitted from the illumination device per unit time is adjustable by driving the liquid crystal element for light adjustment with time-sharing between a high transmittance ratio and a low transmittance ratio in response to information from outside, and a signal applied to the light modulation device being changed based on a signal supplied to the liquid crystal element for light adjustment such that color tone being changed by the liquid crystal element for light adjustment, the changed color tone of light emitted from the liquid crystal element for light adjustment being correctable by the light modulation device.

9. The display according to claim 8, further comprising: a control signal determination device that determines a control signal to control the liquid crystal element for light adjustment based on an image signal and a light adjustment control device controlling the liquid crystal element for light adjustment based on the control signal.

10. The display according to claim 8 further comprising: a light modulation control signal determination device that determines a control signal to control the light modulation device based on a control signal that controls the liquid crystal element for light adjustment and a light modulation control device that controls the light modulation device based on the control signal determined by the light modulation control signal determination device.

11. A display, comprising: an illumination device; and a light modulation device that modulates light emitted from the illumination device; the illumination device being provided with a light source, a uniform illumination device making a distribution of illumination of light incident from the light source uniform, and a liquid crystal element for light adjustment, installed on an optical axis of light emitted from the light source, to adjust the intensity of light emitted from the light source, a flux of light emitted from the illumination device per unit time is adjustable by driving the liquid crystal element for light adjustment with time-sharing between a high transmittance ratio and a low transmittance ratio in response to information from outside, and a period of applying voltage to the light modulation device being changed based on a signal supplied to the liquid crystal element for light adjustment such that color tone being changed by the liquid crystal element for light adjustment, the changed color tone of light emitted from the liquid crystal element for light adjustment being correctable by the light modulation device.

12. A method of driving a display, including a liquid crystal element for light adjustment and a light modulation device, comprising: adjusting a flux of light emitted from an illumination device with time-sharing between a high transmittance ratio and a low transmittance ratio to display the light, a control signal that controls the liquid crystal element for light adjustment being determined based on an image signal, and the liquid crystal element for light adjustment being controlled based on the control signal, such that a flux of light irradiated to the light modulation device is adjusted; the control signal that controls the liquid crystal element for light adjustment being determined based on the image signal, and the liquid crystal element for light adjustment being controlled based on the control signal, such that a flux of light irradiated to the light modulation device is adjusted, while a control signal that controls the light modulation device being determined based on the control signal to control the liquid crystal element for light adjustment, and the light modulation device being controlled based on the control signal such that color tone being changed by the liquid crystal element for light adjustment, the changed color tone of light emitted from the liquid crystal element for light adjustment being corrected by the light modulation device.
Description



BACKGROUND OF THE INVENTION

1. Field of Invention

The present invention relates to a projection type display, a display and a drive method thereof. In particular, it relates to a projection type display, a display and its drive method, that are superior in an image expression and obtain an image of brightness fitted for a user's favorite and an operating environment.

2. Description of Related Art

The related art includes developments in information apparatuses. In the related art, there is an increasing demand for flat type displays with high resolution and low power consumption. Thus, the related art includes research and development of these features. In particular, a liquid crystal display is expected to satisfy the above-mentioned demand since its optical characteristic varies by electrically controlling an alignment of liquid crystal molecules. As one form of this liquid crystal display, a projection type liquid crystal display (liquid crystal projector) is well known. The display projects and enlarges an image emitted from optical system using a liquid crystal display light valve onto a screen via a projection lens.

A projection type liquid crystal display uses a liquid crystal light valve as a light modulation device. On the other hand, projection type displays in practical use include those using a digital mirror device (hereafter "DMD") as a light modulation device in addition to a liquid crystal light valve. However, this kind of a related art projection type display has the following problems.

(1) Sufficient contrast cannot be obtained because of light leakage and stray light among various kinds of optical elements constituting an optical system. Hence, the range of gray scale for displaying (the dynamic range) is narrow, and the related art projection type display is inferior to an existing monitor using a cathode ray tube (hereafter "CRT") in quality and strong appeal of an image.

(2) Even if improvement in quality of an image is intended by processing various kinds of image signals, sufficient effects are not exhibited because of the narrow dynamic range.

In order to address or solve such problems of a projection type display, namely in order to expand its dynamic range, it is considered that a flux of light incident on a light modulation device (a light valve) is changed in response to an image signal. The most convenient method to realize such change is to change the light-emitting intensity of a lamp. Japanese Patent Laid-Open No. 3-179886 discloses a method to control the light-emitting intensity of a metal halide lamp.

As a lamp used in a projection type liquid crystal display, a high-pressure mercury lamp is commonly used in the related art. However, it is extremely difficult to control the light-emitting intensity of a high-pressure mercury lamp. Hence, it is required to provide a method that changes a flux of light incident on a light modulation device in response to an image signal, even if the light-emitting intensity of a lamp itself is not changed.

In addition to the above-mentioned problems, the light-emitting intensity of a light source is fixed in related art projection type displays. Hence, it is a problem that, for example, a displayed image becomes too bright under a viewing environment that is relatively dark, and brightness of a displayed image changes in response to the size of a projection screen changed by zooming a projection lens and a projection distance.

In order to overcome the above mentioned problems, the object of the present invention is to provide a projection type display, a display and its driving method that can change a flux of light incident onto a light modulation device without changing the light-emitting intensity of a lamp and show superior effects in an image expression and adaptability to an operating environment.

SUMMARY OF THE INVENTION

In order to address the above-mentioned object, a projection type display of the present invention, as the first mode, includes: an illumination device; a light modulation device modulating light emitted from the illumination device; and a projecting device projecting light modulated by the light modulation device, the illumination device being provided with a light source, a uniform illumination device making distribution of illumination of light emitted from the light source uniform, and a liquid crystal element for light adjustment, installed on the optical axis of light emitted from the light source, adjusting the intensity of light emitted from the light source; and a flux of light emitted from the illumination device per unit time is adjustable by driving the liquid crystal element for light adjustment with time-sharing in response to information from outside.

The inventor found that a liquid crystal element for light adjustment, adjusting the transmittance ratio based on information from outside, is added to the related art illumination device of a projection type display to adjust a flux of light incident onto the light modulation device in response to an image, without changing light-emitting intensity of a light source. The above-mentioned "information from outside" is, for example, information based on an image signal applied to a light modulation device, information based on the rate of magnifying a projected image, information based on a state of brightness under operational environment, and/or information of user's taste.

According to the projection type display of the present invention, a liquid crystal element for light adjustment to control a flux of light emitted from a light source is provided, and this liquid crystal element for light adjustment is controlled based on the information from outside. Hence, a flux of light emitted from the illumination device to the light modulation device per unit time can be adjusted by function of the liquid crystal element for light adjustment when the projection type display is used. For example, if information from outside is based on an image signal, and the image at that time is a bright scene, the liquid crystal element for light adjustment is driven with time-sharing when receiving a voltage applied thereto. A flux of transmitting light per unit time is adjusted by the time allocation of this time-sharing drive such that a flux of light emitted from the illumination device to the light modulation device per unit time is adjusted.

For example, if the time allocation for applying voltage and for applying non-voltage during one frame of the liquid crystal element for light adjustment in a normally white display is controlled, it is possible to freely change this time allocation of two states such as 100% transmittance ratio and 0% transmittance ratio (hereafter referred to as "the time allocation for 100% transmittance ratio" and "for 0% transmittance ratio").

In addition, changing the time allocation for 100% transmittance ratio and for 0% transmittance ratio also changes a flux of light emitted from the liquid crystal element for light adjustment. Hence, in case of a bright scene, the time allocation for 100% transmittance ratio is increased and the time allocation for 0% transmittance ratio is decreased, so as to increase a flux of light. In case of a dark scene, the time allocation for 100% transmittance ratio is decreased and the time allocation for 0% transmittance ratio is increased, so as to decrease a flux of light. Thus, a flux of light emitted to the light modulation element can be adjusted by the liquid crystal element for light adjustment.

Therefore, the light modulation device can obtain light having the intensity according to an image, even when the light-emitting intensity from the light source is fixed, and the above-mentioned constitution can contribute to expansion of the dynamic range of the projection type display. Similarly, it is possible to obtain light having the intensity according to a magnifying rate of projection, brightness under an operational environment or a user's taste.

Therefore, according to the projection type display of the present invention, it is provided with the illumination device where a flux of light emitted from the uniform illumination device per unit time is adjustable by driving the liquid crystal element for light adjustment with time-sharing based on information from outside. Hence, light having desirable brightness can be obtained at the light modulation device even when light-emitting intensity of a light source is fixed. Thus, dynamic range of a projection type display can be expanded, and a projection type display, that is superior in an image expression and adaptability to an operating environment, can be realized.

When a flux of light is adjusted by the liquid crystal element for light adjustment, the white balance of light emitted from the liquid crystal element for light adjustment to the light modulation device, may be changed. Namely, light emitted from the liquid crystal element for light adjustment to the light modulation device, may be colored. This is because birefringence of liquid crystal is utilized in a liquid crystal element used as a light adjusting device. If light, emitted from the liquid crystal element for light adjustment to the light modulation device is colored, such coloration affects light emitted from the light modulation device such that an image obtained by projecting the light is also affected. Hence, according to the projection type display of the present invention, voltage applied to the light modulation device is changeable in response to a signal applied to the liquid crystal element for light adjustment, or period of applying voltage to the light modulation device is changeable in response to a signal applied to the liquid crystal element for light adjustment. Hence, it is possible thereby to correct color tone (white balance correction) by the light modulation device regarding light emitted from the liquid crystal element for light adjustment.

For example, when the transmittance ratio of the liquid crystal element for light adjustment is near 100% (more concretely, the transmittance ratio 98%) and the transmittance ratio is near 0% (more concretely, transmittance ratio 2%), a proportional formula can be easily calculated, showing the relationship between the transmittance ratio of the liquid crystal element for light adjustment and the white balance of light emitted from the liquid crystal element for light adjustment (the relationship between the time allocation for the transmittance ratio 100% and for the transmittance ratio 0% of the liquid crystal element for light adjustment and the white balance of light emitted from the liquid crystal element for light adjustment), from two points showing the white balance of light emitted from the liquid crystal element for light adjustment. Then, such a proportional formula is memorized in advance in a control circuit, and voltage applied to the light modulation device is corrected by simple calculation, or a period of supplying voltage to the light modulation device is corrected by simple calculation such that light emitted from the liquid crystal element for light adjustment becomes the desired white balance. Hence, it is possible to emit light in which the color tone is corrected by the light modulation device, for example, light under the condition of the desired white balance. Thus, light emitted from the light modulation device can be prevented from being affected by coloration of light emitted from the liquid crystal element for light adjustment.

The relationship, between the transmittance ratio of the liquid crystal element for light adjustment (a flux of light emitted from the liquid crystal element for light adjustment) and the white balance of light emitted from the liquid crystal element for light adjustment, is linear. Therefore, the white balance is corrected only by operating simple calculation to signals applied to the light modulation device based on signal applied to the liquid crystal element for light adjustment. Thus, color tone can be easily corrected, and the size of a control circuit can be small.

Therefore, according to the projection type display of the present invention, a flux of light emitted from the uniform illumination device can be adjusted by driving the liquid crystal element for light adjustment with time-sharing based on information from outside. Further, it is possible to correct color tone by changing signals applied to the above light modulation device based on signals applied to the liquid crystal element for light adjustment. Hence, even when the light-emitting intensity of the light source is fixed, light having desired brightness and corrected white balance can be obtained at the light modulation device such that the dynamic range of a projection type display can be expanded, and a projection type display device that is superior in an image expression and adaptability to operating environment can be realized.

In an exemplary embodiment of a liquid crystal element for light adjustment according to the present invention, a liquid crystal panel is preferably used, where a liquid crystal layer is sandwiched between a pair of light-transmissive substrates, light-transmissive electrodes are formed on the liquid crystal layer side of the pair of light-transmissive substrates and an orientation film is formed at the liquid crystal layer side on these light-transmissive electrodes. It is preferable that a rapid response system such as a FLC (a ferroelectric liquid crystal) system, an AFLC (antiferroelectric liquid crystal) system, a .pi.-cell system, or a TN (Twisted Nematic) system are used, as this liquid crystal panel.

In an exemplary embodiment of a uniform illumination device according to the present invention, the structure may be such that two fly-eye lenses include a first fly-eye lens and second fly-eye lens that are arranged in order from the side closest to the light source along with the above optical axis. Thus, in the uniform illumination device including two fly-eye lenses, plural images of the second light source are formed by a first fly-eye lens. These plural images of the second light source are superimposed on a light adjustment element via the second fly-eye lens. Hence, distribution of illumination of the original light source can be uniform.

In addition, in another exemplary embodiment of the uniform illumination device, there may be provided a rod type light guide member that emits bundles of light rays by divining a bundle of light from the light source into plural bundles of light rays. According to another exemplary embodiment a rod type light guide member, a rod lens and so on can be used. Thus, if a uniform illumination device is a rod type light guide member, it is possible to control not only a flux of light that irradiates the entire surface to be irradiated of the light modulation device, but also a flux of light that irradiates each area when the entire region to be irradiated in the light modulation device, is divided into plural areas. According to this embodiment, it is possible to control an illumination distribution within such area in the light modulation device.

Next, a display of the present invention includes an illumination device and a light modulation device modulating light emitted from the illumination device, wherein the illumination device being provided with a light source, a uniform illumination device making distribution of illumination of light emitted from the light source uniform, and a liquid crystal element for light adjustment, installed on an optical axis of light emitted from the light source, adjusting the intensity of light emitted from the light source; and a flux of light emitted from the uniform illumination device per unit time is adjustable by driving the liquid crystal element for light adjustment with time-sharing in response to information from outside.

According to this display, the illumination device can adjust a flux of light emitted from the uniform illumination device per unit time by controlling a flux of light transmitting through the liquid crystal element for light adjustment with time-sharing drive based on information from outside. Hence, the desired brightness of light can be obtained at the light modulation device, even when light-emitting intensity is fixed, such that the dynamic range of a projection type display can be expanded. Thus a projection type display, superior in an image expression and adaptability to an operating environment, can be realized.

In addition, in an exemplary embodiment the light modulation device can correct color tone by changing signals applied to the light modulation device based on signals applied to the liquid crystal element for light adjustment. In addition, in an exemplary embodiment, in the above light modulation device, the period of applying voltage to the light modulation device is changed based on a signal supplied to the liquid crystal element for light adjustment, such that color tone of light emitted from the liquid crystal element for light adjustment is correctable by the light modulation device.

In addition, to drive the above projection type display or display, an exemplary embodiment provides a control signal determination device determining a control signal, to control the liquid crystal element for light adjustment, based on an image signal; and a light adjustment control device controlling the liquid crystal element for light adjustment based on the control signal.

According to this structure, a control signal determination device determines a brightness control signal for controlling the liquid crystal element for light adjustment based on an image signal. The light adjustment control device controls the time allocation for the light transmittance ratio 100% and for the transmittance ratio 0% in 1 frame in the liquid crystal element for light adjustment based on the above control signal. A flux of light per 1 frame is controlled by this operation. As a result, the dynamic range of a projection type display or a display can be expanded, and a projection type display or a display superior in an image expression and adaptability to an operating environment can be realized.

In addition, in the above projection type display or display, according to an exemplary embodiment, it is preferable to provide a light modulation control signal determination device, as a control device, determining a control signal to control the light modulation device based on the control signal controlling the liquid crystal element for light adjustment; and a light modulation control device controlling the light modulation device based on the control signal determined by the light modulation control signal determination device.

The light modulation control signal determination device memorizes a proportional formula, in advance, showing the relationship between the transmittance ratio of the liquid crystal element for light adjustment (or a flux of light emitted from the liquid crystal element for light adjustment) and the white balance of light emitted from the liquid crystal element for light adjustment (the proportional formula showing the relationship between the time allocation for the transmittance ratio 100% and for the transmittance ratio 0% of the liquid crystal element for light adjustment and the white balance of light emitted from the liquid crystal element for light adjustment). The light modulation control signal determination device determines a signal applied to the light modulation device by simple calculation such that light emitted from the liquid crystal element for light adjustment to the light modulation device becomes desired white balance in the light modulation device. This determined signal is applied to the light modulation device from the light modulation control device based on the signal determined by the light modulation control signal determination device. This operation can correct color tone of light emitted from the liquid crystal element for light adjustment to the light modulation device.

In addition, an exemplary method of driving the above projection type display or a display, determines a control signal to control the liquid crystal element for light adjustment based on an image signal and controls the liquid crystal element for light adjustment based on the control signal, such that a flux of light irradiated to the light modulation device is adjusted.

According to this structure, the dynamic range of a projection type display or a display can be expanded, and an image having a high image expression can be obtained.

Further, in an exemplary method of driving the above projection type display or a display, it is preferable to determine a control signal to control the light modulation device based on the control signal to control the liquid crystal element for light adjustment and control the light modulation device based on the control signal such that color tone of light is corrected. According to this method, color tone of light emitted from the liquid crystal element for light adjustment to the light modulation device can be corrected such that change of the white balance by coloration of light emitted from the liquid crystal element for light adjustment can be avoided.

Next, in order to address the above issue, a projection type display of the present invention, as the second mode, includes a light source; a color separation device separating light emitted from the light source into plural color lights; plural light modulation device modulating plural color lights separated by the color separation device, a color integration device integrating color lights modulated by the plural light modulation device; and a projecting device projecting light integrated by the color integration device, wherein; a first light adjustment device adjusting a flux of the color light is installed between the light adjustment device and the color separation device along an optical path of at least one separated color light, and the first light adjustment device is controlled based on information from outside such that a flux of color light transmitting through the first light adjustment device is adjustable.

The inventor found an additional way to adjust a flux of light incident onto the light modulation device in response to an image without changing light-emitting intensity of a light source, where a flux of at least one color light among plural color lights obtained by separating light emitted from the light source by the color separation device, can be adjusted based on information from outside. The above-mentioned "information from outside" is, for example, information based on an image signal applied to a light modulation device, information based on the rate of magnifying a projected image, information based on a state of brightness under operational environment and information of user's taste.

Namely, according to a projection type display of an exemplary embodiment, the first light adjustment device for controlling a flux of light is installed between the light modulation device and the color separation device on the optical path of at least one separated color light. This first light adjustment device is controlled based on the above mentioned information from outside. In other words, the first light adjustment device adjusting a flux of at least one color light among plural color lights separated by the color separation device is provided between at least one of, plural light modulation devices and the color separation device, such that the first light adjustment device is controlled based on information from outside. Hence, for example, when information from outside is information based on an image signal, and an image scene at that time has deviated color tone, the light transmittance of color light transmitting through the first light adjustment device is adjusted by controlling the first light adjustment device such that it is possible to adjust a flux of light, incident on the light modulating device, corresponding to the first light adjustment device. In this way, at least one of the plural light modulation device can obtain a flux of light in response to an image, even when the light-emitting intensity of the light source is fixed, such that the dynamic range of the projection type display can be expanded.

Therefore, according to the projection type display of the above exemplary embodiment, a flux of at least one color light among plural color lights, obtained by separating the light emitted from the light source using the color separation device, can be adjusted by controlling the first light adjustment device based on the information from outside. Hence, even when the light-emitting intensity of the light source is fixed, the desired intensity of color light can be obtained at the light modulation device corresponding to the first light adjustment device such that the dynamic range of a projection type display can be expanded, and a projection type display superior in an image expression and adaptability to an operational environment can be realized.

In addition, in the projection type display of the second exemplary embodiment, a second light adjustment device adjusting a flux of light emitted from the light source may be installed between the light source and the color separation device; and the second light adjustment device may be controlled based on information from outside such that a flux of light emitted from the light source transmitting through the second light adjustment device is adjustable (this may be referred to as third mode of the projection type display).

According to the structure provided with the above mentioned second light adjustment device installed between the light source and the color separation device, a flux of light emitted from the light source can be adjusted in advance by the second light adjustment device based on the information from outside before color separation. Then, a flux of at least one of color lights among plural color lights after color separation can be adjusted by the first light adjustment device, thereafter.

In addition, in the second exemplary embodiment of the projection type display, it is preferable that the plural color lights, separated by the color separation device are red light, green light and blue light; the plural light modulation device includes a red light modulation device for modulating the red light, a green light modulation device for modulating the green light and a blue light modulation device for modulating the blue light; the first light adjustment device is installed between the plural light modulation device and the color separation device; and the first light adjustment device is controlled based on information from outside such that a flux of light transmitting through the first light adjustment device is adjustable.

According to the structure of this projection type display, the first light adjustment device is provided between the plural light modulation device and the color separation device. The first light adjustment device is provided on each of the optical axes of plural separated color lights between the light modulation device and the color light separation device, such that it is possible to adjust a flux of any color light, such as red light, green light and blue light obtained by color separation of light emitted from the light source. Hence, even when the light-emitting intensity of the light source is fixed, a desirable flux of light can be obtained at the light modulation device corresponding to each of the first light adjustment device. Therefore, brightness corresponding to an image can be obtained. Further, even when color tone of an image is deviated, it is possible to adjust light effectively. Thus, the dynamic range of the projection type display can be expanded, and it is advantageous in that the projection type display superior in an image expression and adaptability to an operational environment can be realized.

In addition, when the first light adjustment device is provided between the plural light modulation device and the color separation device, a flux of each of the plural color lights can be adjusted by controlling each of the first light adjustment devices, such that it is possible to adjust the white balance of light obtained by integrating color lights emitted from each of the light modulation device.

Thus, when the first light adjustment device is provided between the plural light modulation device and the color separation device, the intensity of color light emitted to each of the light modulation devices can be adjusted by controlling each of the first light adjustment devices, such that it is not necessary to install the second light adjustment device before color separation.

In addition, in the third exemplary embodiment of a projection type display, it is preferable that the plural color lights separated by the color separation device are red light, green light and blue light. The plural light modulation device includes a red light modulation device for modulating the red light, a green light modulation device for modulating the green light and a blue light modulation device for modulating the blue light. The first light adjustment device is installed between the green light modulation device and the color separation device along a green light path; and the first light adjustment device is controlled based on information from outside such that a flux of green light transmitting through the first light adjustment device is adjustable.

According to this projection type display, a flux of light emitted from the light source can be adjusted in advance, before the color separation by the second light adjustment device, based on the information from outside. Then, a flux of green light, among plural color lights after color separation, can be adjusted by the first light adjustment device thereafter. Hence, for example, in case of an image such as evening scenery or blue sky, a flux of green light can be decreased by controlling the first light adjustment device such that gray scale displaying green color can be finely managed, and gray scale reproduction of green color can be improved.

Green light has high visual sensitivity for a viewer such that an image seems to be dark if the green color light is weak, even when red or blue light is strong. In an image such as evening scenery, it is necessary that red light is emitted strongly, and when a light adjustment device is installed before color separation, a flux of light can not be decreased whereas an image looks dark. As a result, green tone reproduction becomes worse, and good image display is not provided. On the other hand, according to the above mentioned projection type display, a flux of green light, among plural color lights after the color separation, can be adjusted by the first light adjustment device such that desirable image reproduction can be attained effectively, even if color tone of image is deviated like a blue sky or evening scenery.

In addition, in the third exemplary embodiment of the projection type display, it is preferable that the plural color lights separated by the color separation device are red light, green light and blue light. The plural light modulation device includes a red light modulation device for modulating the red light, a green light modulation device for modulating the green light and a blue light modulation device for modulating the blue light. The first light adjustment device is installed between the blue light modulation device and the color separation device along a blue light path; and the first light adjustment device is controlled based on information from outside, such that a flux of blue light transmitting through the first light adjustment device is adjustable.

According to the projection type display, a flux of light emitted from the light source can be adjusted in advance by the second light adjustment device based on the information from outside before color separation. Then, a flux of blue light, among plural color lights after color separation, can be adjusted by the first light adjustment device thereafter. Hence, for example, in case of an image of evening scenery, a flux of blue light is decreased by controlling the first light adjustment device such that the ratio of red light in an image can be increased. Therefore, according to the above mentioned projection type display, a flux of blue light, among plural color lights after color separation, can be adjusted by the first light adjustment device such that desirable image reproduction can be attained effectively, even if color tone of image is deviated like evening scenery.

Further, when the first light adjustment device, adjusting the intensity of blue light is installed between the above color separation device and the blue light modulation device, a flux of blue light incident on the light modulation device for blue light can be decreased in case of an image having a small flux of blue light. Hence, even when the light modulation device for blue light includes a liquid crystal display described thereafter, deterioration of a liquid crystal display due to the blue light can be avoided, and light-proof property of a liquid crystal display can be improved as the light modulation device for blue light.

In addition, in the third exemplary embodiment of the projection type display, it is preferable that the plural color lights separated by the color separation device are red light, green light and blue light. The plural light modulation device includes a red light modulation device for modulating the red light, a green light modulation device for modulating the green light and a blue light modulation device for modulating the blue light. Each of the first light adjustment devices are installed between the green light modulation device and the color separation device along a green light path; and/or between the blue light modulation device and the color separation device along a blue light path. These first light adjustment devices are controlled based on information from outside, such that a flux of the blue light and the green light transmitting through the first light adjustment device is adjustable.

According to this projection type display, it has similar effects as those of a display provided with the first light adjustment device adjusting a flux of blue light or the first light adjustment device adjusting the intensity of green light described before.

In addition, a projection type display of the present invention, as the fourth mode, includes a light source; a color separation device separating light emitted from the light source into plural color lights sequentially; a light modulation device modulating each of plural color lights separated by the color modulation device; and a projecting device projecting each of the color lights modulated by the color modulation device sequentially. A first light adjustment device, adjusting a flux of each of the color lights synchronously with emitting each of the color lights from the color separation device, is installed between the light modulation device and the color separation device. The first light adjustment device is controlled based on information from outside such that a flux of light transmitting through the first light adjustment device is adjustable.

According to the projection type display of the fourth exemplary embodiment, a flux of each color light, separated from light of the light source by the color separation device, can be adjusted by controlling the first light adjustment device. Hence, even when light-emitting intensity of the light source is fixed, a desirable amount of color light can be obtained by the light modulation device, such that the dynamic range of the projection type display can be expanded, and a projection type display, superior in an image expression and adaptability to an operational environment, can be realized.

In addition, a projection type display of the present invention, as the fifth exemplary embodiment, includes a light source; a color separation device separating light emitted from the light source into plural color lights sequentially; a light modulation device modulating each of plural color lights separated by the color modulation device; and a projecting device projecting sequentially each of the color lights modulated by the light modulation device.

A second light adjustment device, adjusting a flux of light emitted from the light source synchronously with emitting each of the color lights from the color separation device, is installed between the light source and the color separation device. The second light adjustment device is controlled based on information from outside such that a flux of light emitted from the light source and transmitting through the second light adjustment device is adjustable.

According to this projection type display, a flux of light emitted from the light source can be adjusted before the color separation by controlling the second light adjustment device based on information from outside. A flux of each of the color lights obtained by transmitting such adjusted light through color separation devices is adjusted such that a desired flux of light can be obtained, even when the light-emitting intensity of the light source is fixed. Hence, the dynamic range of the projection type display can be expanded, and the projection type display superior in an image expression and adaptability to an operational environment can be realized.

In addition, a projection type display of the present invention, as the sixth exemplary embodiment, includes plural light sources capable of emitting different color lights, respectively; plural light modulation devices modulating the color lights corresponding to the plural light sources, respectively; a color integration device integrating color lights modulated by the plural modulation devices; and a projecting device projecting light integrated by the color integration device.

A first light adjustment device adjusting the intensity of the color light is installed between the light source and the color modulation device along an optical path of at least one of the different color lights; and the first light adjustment device is controlled based on information from outside such that a flux of light transmitting through the first light adjustment device is adjustable.

According to this projection type display, a flux of at least one of the plural color lights emitted from the plural light sources can be adjusted by controlling the first light adjustment device based on the information from outside. A desired flux of light can be obtained at the light modulation device corresponding to the first light adjustment device such that the dynamic range of the projection type display can be expanded, and the projection type display superior in an image expression and adaptability to an operational environment can be realized.

In addition, in the projection type display of the sixth exemplary embodiment, it is preferable that the different color lights, separated by the color separation device, are red light, green light and blue light. The plural light modulation devices include a red light modulation device for modulating the red light, a green light modulation device for modulating the green light and a blue light modulation device for modulating the blue light. The first light adjustment device is installed between the plural light sources and the plural light modulation devices. The first light adjustment device is controlled based on information from outside, such that a flux of the color light transmitting through the first light adjustment device is adjustable.

According to this projection type display, the first light adjustment device is provided between the plural light sources and the plural light modulation devices. Namely, the first light adjustment device is provided on the light path for each of the plural color lights between the light source and the light modulation device, such that it is possible to adjust a flux of color lights such as red light, green light and blue light emitted from the plural light sources. Even when the light-emitting intensity of each of the light sources is fixed, a desired amount of color lights can be obtained by the light modulation device corresponding to the first light adjustment device, such that brightness in response to an image can be obtained, and light adjustment is effectively attained even when color tone of an image is deviated. Hence, the dynamic range of the projection type display can be expanded, and it is advantageous in realizing the projection type display superior in an image expression and adaptability to an operational environment.

In addition, the projection type display of the present invention, as the seventh exemplary embodiment, includes a light source capable of emitting each of different color lights sequentially; a light modulation device modulating each of the color lights; and a projecting device projecting each of the color lights modulated by the modulation device.

A first light adjustment device capable of adjusting a flux of the color light synchronously with emitting each of the color lights from the light source is provided. The first light adjustment device is controlled based on information from outside such that a flux of light transmitting through the first light adjustment device is adjustable.

According to this projection type display, a flux of each of the color lights emitted from the light source can be adjusted by controlling the first light adjustment device based on the information from outside, such that a desired flux of light can be obtained at the light modulation device even when the light-emitting intensity of color lights emitted from the light source is fixed. Hence, the dynamic range of a projection type display can be expanded, and a projection type display superior in an image expression and adaptability to an operational environment can be realized.

In the above projection type display, at least one of the first light adjustment devices may be a liquid crystal element for light adjustment. In such first light adjustment device, including a liquid crystal element for light adjustment, when voltage is applied to this liquid crystal element for light adjustment, for example, the applied voltage is increased, so that the transmittance ratio of color light transmitting through the first light adjustment device becomes lower. Further, when the applied voltage is decreased, the transmittance ratio of color light transmitting through the first light adjustment device becomes higher. Thus, the intensity of color light can be adjusted.

In the projection type display, at least one of the first light adjustment device may be a shutter of a roll screen system or a disk rotary system. In such first light adjustment device, including a shutter of the roll screen system or the disk rotary system, color light transmitting through this first light adjustment device can be shielded during a specific term. A flux of color light transmitting through this first light adjustment device can be adjusted by changing this shielding term.

In the above projection type display, at least one of the second light adjustment devices may be a liquid crystal element for light adjustment. In such second light adjustment devices, including a liquid crystal element for light adjustment, when voltage is applied to this liquid crystal element for light adjustment, for example, the applied voltage is increased, so that the transmittance ratio of color light transmitting through the second light adjustment device becomes lower. Further, when the applied voltage is decreased, the transmittance ratio of color light transmitting through the second light adjustment device becomes higher. Thus, the intensity of light emitted from the light source can be adjusted before color separation.

In the projection type display, at least one of the second light adjustment devices may be a shutter of a roll screen system or a disk rotary system. In such a second light adjustment device, including a shutter of the roll screen system or the disk rotary system, color light transmitting through this second light adjustment device can be shielded during a specific term. A flux of color light transmitting through this second light adjustment device can be adjusted by changing this shielding term.

As an exemplary embodiment of a liquid crystal element for light adjustment used as the first and the second light adjustment devices, it is preferable to provide a liquid crystal panel where a liquid crystal layer is sandwiched between a pair of light-transmissive substrates, light-transmissive electrodes are formed on the pair of light-transmissive substrates at the side of liquid crystal layer, and an orientation layer is formed on each of the light transmissive-electrodes at the side of a liquid crystal layer. As this liquid crystal panel, TN (Twisted Nematic) system, STN (Super Twisted Nematic) system, VA (Vertical Alignment), .pi.cell system, IPS (In-Plane Switching) system, FLC (a ferroelectric liquid crystal) system, AFLC (antiferroelectric liquid crystal) system can be used.

In addition, a method of driving a projection type display preferably includes a control signal determination device controlling the first light adjustment device and/or the second light adjustment device based on the image signal, and a light adjustment control device controlling the first light adjustment device and/or the second light adjustment device based on the control signal.

According to this structure, a control signal for controlling the above first light adjustment device and/or the second light adjustment device is determined by the control signal determination device based on histogram of every color of image signal. Then, the light adjustment control device supplies light, of which brightness is changed in response to an image, to the light modulation device by controlling the first light adjustment device and/or the second light adjustment device based on these control signals.

Hence, this operation allows the dynamic range of a projection type display to be expanded, and a projection type display superior in an image expression and adaptability to an operational environment can be realized.

A method of driving a projection type display of the present invention is a method of driving any one of the above structures of projection type displays, determines a control signal to control the first light adjustment device and/or the second light adjustment device based on the image signal, and controls the first light adjustment device and/or the second light adjustment device based on the control signal such that a flux of light incident onto the light modulation device is adjusted.

According to this structure, dynamic range of the projection type display can be expanded, and a display superior in an image expression can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic showing a projection type liquid crystal display of the first exemplary embodiment of the present invention.

FIG. 2 is a block schematic showing a drive circuit of the projection type liquid crystal display of the first exemplary embodiment.

FIG. 3 shows a schematic explaining a first method to determine a brightness control signal from an image signal in the projection type liquid crystal display of the first exemplary embodiment.

FIG. 4 shows a schematic explaining a second method of the first exemplary embodiment.

FIG. 5 shows a schematic explaining a third method of the first exemplary embodiment.

FIGS. 6(a) and 6(b) are schematics showing an example of the time allocation of tr


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