Title: Liquid crystal display and manufacturing process thereof
Abstract: The invention provides a small-sized liquid crystal display in which a frame region of an outer peripheral portion of a display region is made small without any light leak at peripheral portion of the display region of a liquid crystal display panel. The invention also provides a manufacturing process of such a liquid crystal display. Periphery shading films (shade films 3a and 3b) of a display region of a liquid crystal display panel are alternately formed on a first substrate 1 (shade film 3a) and a second substrate 2 (shade film 3b) oppositely arranged, and a transparent portion (width Q) for irradiating a seal resin 4 used to adhere the two substrates forming the liquid crystal display panel with ultraviolet rays 7 is provided within a region (width P) where the periphery shading films are formed.
Patent Number: 6,842,208 Issued on 01/11/2005 to Takasaki, et al.
| Inventors:
|
Takasaki; Ichiro (Kumamoto, JP);
Morii; Yasuhiro (Kumamoto, JP);
Mizunuma; Masaya (Kumamoto, JP)
|
| Assignee:
|
Kabushiki Kaisha Advanced Display (Kumamoto, JP)
|
| Appl. No.:
|
881753 |
| Filed:
|
June 18, 2001 |
Foreign Application Priority Data
| Aug 07, 1998[JP] | 10-224179 |
| Current U.S. Class: |
349/110; 349/149; 349/153; 349/190 |
| Intern'l Class: |
G02F 001/133.3; G02F001/134.5 |
| Field of Search: |
349/153,110-111,149,190
|
References Cited [Referenced By]
U.S. Patent Documents
| 4222635 | Sep., 1980 | Julke | 349/190.
|
| 5889569 | Mar., 1999 | Okamoto et al. | 349/110.
|
| 5959712 | Sep., 1999 | Morii et al. | 349/190.
|
| 6104467 | Aug., 2000 | Nakahara et al. | 349/189.
|
| 6115097 | Sep., 2000 | Yamazaki | 349/153.
|
| 6118509 | Sep., 2000 | Miyake | 349/153.
|
| 6124917 | Sep., 2000 | Fujioka et al. | 349/153.
|
| 6400439 | Jun., 2002 | Fujioka et al. | 349/153.
|
| 6424394 | Jul., 2002 | Morii | 349/110.
|
Primary Examiner: Ton; Toan
Attorney, Agent or Firm: McDermott Will & Emery LLP
Parent Case Text
This application is a divisional of application Ser. No. 09/376,057 filed
Aug. 17, 1999 now U.S. Pat. No. 6,268,898.
Claims
What is claimed is:
1. A manufacturing process of a liquid crystal display, comprising the
steps of:
providing a first substrate having a display region, an outside edge
portion positioned outside of the display region, and a first shade film
formed on the outer edge portion;
providing a second substrate having a display region opposing to the
display region of the first substrate, an outside edge portion opposing to
the outside edge portion of the first substrate, electrodes for displaying
on the display region, an electrode leading wires having shading
characteristics and lead from the display electrodes to an outside of the
display region, and a second shade film formed on the outside edge portion
of the second substrate;
forming a combination of the first substrate and the second substrate
oppositely to each other with a seal resin of an ultraviolet ray hardening
type between the outside edge portions of the first and second substrates,
wherein the first and second shade films are formed to give a peripheral
shading width formed by putting together the width of the first shade film
and the width of the second shade film, the seal resin is positioned only
between the second shade film of the second substrate and a transparent
portion of the first substrate corresponding to the second shade film, and
ultraviolet ray can be transmitted through the transparent portion of the
first substrate;
sealing a liquid crystal held between the first substrate and the second
substrate with the seal resin; and
hardening the seal resin by irradiation to only one side of the first
substrate of the combination with ultraviolet ray through the transparent
portion of the first substrate.
2. The manufacturing process of the liquid crystal display according to
claim 1, wherein the irradiation for the one side for the combination is
performed only on the seal resin applied portion.
3. The manufacturing process of the liquid crystal display according to
claim 2, wherein the irradiation is performed through a shade plate having
an ultraviolet ray transmitting region at the seal resin applied portion.
4. The manufacturing process of the liquid crystal display according to
claim 2, wherein the irradiation is performed through a fiber at seal
resin applied portion.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display and to a
manufacturing process thereof.
2. Prior Art
FIG. 17 is a schematic plan view showing a liquid crystal display panel of
a conventional liquid crystal display, FIG. 18(a) is a schematic sectional
view taken along the line J--J of FIG. 17, and FIG. 18(b) is a schematic
sectional view taken along the line K--K of FIG. 17.
In the drawings, reference numerals 1 and 2 indicate a first substrate and
a second substrate oppositely arranged; numeral 3a indicates a shade film
formed on the first substrate 1; numeral 4 indicates a seal resin of
ultraviolet ray hardening type; numeral 5 indicates a display electrode
for displaying a picture formed on the second substrate 2; numeral 6
indicates a display electrode, electrode leading wire, insulating film,
etc. (hereinafter referred to as electrode leading wire, etc.) formed on
the outside of a display region of the second substrate 2; and numeral 7
indicates ultraviolet rays with which the seal resin 4 is irradiated for
hardening.
In the conventional liquid crystal display of above arrangement, the first
substrate 1 and the second substrate 2 arranged oppositely are adhered to
each other, and the seal resin 4 of ultraviolet ray hardening type for
sealing a liquid crystal held between the first substrate 1 and the second
substrate 2 is applied to a transparent portion where at least either the
first substrate 1 or the second substrate 2 is transparent, and the
applied seal resin 4 is hardened from the transparent substrate side by
irradiation with the ultraviolet rays 7. In addition, as a film for
shading the ultraviolet rays such as electrode leading wire, etc. 6 is
formed in the peripheral portion of the second substrate 2, the
irradiation with the ultraviolet rays 7 is generally performed from the
first substrate 1 side.
Since the conventional liquid crystal display is arranged as mentioned
above, as shown in FIG. 18(a), in the peripheral portion of the first
substrate 1, it is necessary to secure a transparent portion having a
width Q for irradiating the seal resin 4 with the ultraviolet rays 7 on
the outside of a portion where the shade film 3a having a width P for
shading a display region is formed. Thus, it is necessary for a width R of
a frame region being an outer periphery of the display region to have a
width formed by putting together the width P and the width Q. Hence, a
problem exists in that the liquid crystal display cannot be small-sized.
Further, when making small the width R of the frame region of the outer
periphery of the display region while securing the width Q of the
transparent portion for irradiating the seal resin 4 with the ultraviolet
rays 7, the region for forming the shade film 3a to shade the periphery of
the display region becomes insufficient. Hence, another problem exists in
that a light leak takes place in the peripheral portion of the display
region, eventually resulting in poor display quality.
Furthermore, when the irradiation with the ultraviolet rays 7 is performed
from the second substrate 2 side where the shade film 3a for shading the
periphery of the display region is not formed, the ultraviolet rays are
shaded by the electrode leading wire, etc. 6 formed in the peripheral
portion of the second substrate 2. Hence, a further problem exists in that
the hardening of the seal resin 4 at this portion is not perfect.
SUMMARY OF THE INVENTION
The present invention was made to solve the above-discussed problems and
has an object of providing a small-sized liquid crystal display in which
the frame region of the outer peripheral portion of the display region is
made small without any light leak at the peripheral portion of the display
region. Another object of the invention is to provide a manufacturing
process suitable to such a liquid crystal display.
To accomplish the foregoing object, a liquid crystal display according to
the invention comprises: a first substrate having a shade film formed in
contact with an outer edge portion of a display region; a second substrate
having a display electrode for displaying on a picture plane, an electrode
leading wire having a shading characteristic and lead from the display
electrode to outside of the display region, and a shade film formed on the
outside of the display region; and a seal resin of ultraviolet ray
hardening type to adhere said first substrate and the second substrate
oppositely to each other and for sealing a liquid crystal held between the
first substrate and the second substrate; in which the shade film formed
on the first substrate and the shade film formed on the second substrate
are formed to be continuous between the first substrate and the second
substrate oppositely arranged, the shade film is formed either on the
first substrate or on the second substrate in a portion where the seal
resin is applied, and ultraviolet rays can transmit through the remaining
substrate.
Another liquid crystal display according to the invention comprises: a
first substrate having a shade film formed in contact with an outer edge
portion of a display region; a second substrate having a display electrode
for displaying on a picture plane and a shade material such as electrode
leading wire lead from said display electrode to outside of the display
region; a seal resin of ultraviolet ray hardening type for adhering said
first substrate and the second substrate oppositely to each other and for
sealing a liquid crystal held between the first substrate and the second
substrate; and a plurality of slits formed on the shade film and on the
shade material for transmitting ultraviolet rays to a seal resin applied
portion; in which the slits are arranged alternately between the first
substrate and the second substrate arranged oppositely.
It is preferable that the slits are arranged alternately between the first
substrate and the second substrate arranged oppositely in the seal resin
applied portion, and the ultraviolet ray transmitting portions thereof are
formed to be continuous.
It is preferable that the slits are arranged alternately between the first
substrate and the second substrate arranged oppositely in the seal resin
applied portion, and the ultraviolet ray transmitting portions thereof are
formed to be discontinuous.
It is preferable that the slits are formed into an optional secondary
dimensional shape as occasion demands.
A manufacturing process of a liquid crystal display according to the
invention includes a step of hardening a seal resin of ultraviolet ray
hardening type applied for adhering a first substrate and a second
substrate by irradiating two surfaces of the overlapped first and second
substrates with ultraviolet rays.
It is preferable that the irradiation of the overlapped first and second
substrates with the ultraviolet rays is performed simultaneously from two
sides.
It is preferable that the irradiation of the overlapped first and second
substrates with the ultraviolet rays is performed alternately one side
after another.
The manufacturing process includes a step of irradiating only the seal
resin applied portion with the ultraviolet rays to harden the seal resin
applied for adhering the overlapped first and second substrates to each
other.
It is preferable that the irradiation of the overlapped first and second
substrates with the ultraviolet rays is performed through a shade plate
having an ultraviolet ray transmitting region at the seal resin applied
portion.
It is preferable that the irradiation of the overlapped first and second
substrates with the ultraviolet rays is performed by inducing the
ultraviolet rays to the seal resin applied portion through a fiber, etc.
The manufacturing process includes a step of performing a heat treatment,
after the irradiation with the ultraviolet rays using any of said process,
using a seal resin of ultraviolet ray reaction inducing and thermosetting
type.
In the invention, since the shade films for shading the periphery of the
display region in the liquid crystal display are formed alternately on the
two substrates oppositely arranged and the transparent portion for
irradiation with ultraviolet rays is provided on the seal resin used to
adhere the two substrates forming a liquid crystal display panel in the
region where the film for shading the periphery is formed, not only the
peripheral portion of the display region can be prevented from any light
leak by securing sufficiently the region where the film for shading the
periphery is formed, but also the liquid crystal display can be
small-sized by reducing the width of the frame region of the peripheral
portion of the display region.
Further, in the portion to which the seal resin is applied, when the shade
film or the shade material is formed on both of the two substrates
oppositely arranged, by providing alternately the slits for transmission
of the ultraviolet rays in the shade film or the shade material, and by
providing the transparent portion for irradiating the seal resin with the
ultraviolet rays in the periphery shading film region, not only the
peripheral portion of the display region can be prevented from any light
leak by securing sufficiently the region where the periphery shading film
is formed, but also the liquid crystal display can be small-sized by
reducing the width of the frame region of the peripheral portion of the
display region.
Further, when the shade film or the shade material is formed on both of the
two substrates oppositely arranged in the portion to which the seal resin
is applied, by providing a condition that opening portions of the slits
for transmission of the ultraviolet rays formed on the shade film or the
shade material are discontinuous, that is, by providing the overlapping
portion where films having the shade characteristic are overlapped in the
two substrates, there arises an allowance in alignment at the time of
overlapping the two substrates.
Further, in the manufacturing process of a liquid crystal display, when it
is necessary to perform the irradiation of the seal resin of ultraviolet
ray hardening type used to adhere the two substrates forming the liquid
crystal panel oppositely to each other with the ultraviolet rays on both
sides of the overlapped two substrates, by performing such irradiation
simultaneously from both sides, the step of hardening the seal resin can
be performed in a short time, eventually resulting in improvement of
productivity.
Further, in the manufacturing process of a liquid crystal display, when it
is necessary to perform the irradiation of the seal resin of ultraviolet
ray hardening type with the ultraviolet rays on both sides of the
overlapped two substrates, by performing such irradiation one side after
another, construction of ultraviolet ray irradiator can be simplified.
Further, in the manufacturing process of a liquid crystal display, by
performing the irradiation of the seal resin of ultraviolet ray hardening
type with the ultraviolet rays only in the region where hardening of the
seal resin is required, constituent elements (such as display electrode,
orientation film for liquid crystal, etc.) involved in the display
characteristic of the liquid crystal display are free from influences of
the ultraviolet rays, and it becomes possible to achieve a liquid crystal
display of high display quality.
Furthermore, using a seal resin of ultraviolet ray reaction inducing and
thermosetting type, even when there remains any portion not irradiated
with the ultraviolet rays for any reason, the seal resin can be exactly
hardened by heat treatment, and it is possible to achieve a liquid crystal
display of high reliability.
Other objects, features and advantages of the invention will become
apparent in the course of the following description with reference to the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic plan view showing a liquid crystal display panel of a
liquid crystal display according to example 1 of the present invention.
FIGS. 2(a) and (b) are schematic sectional views showing a liquid crystal
display panel of a liquid crystal display according to example 1 of the
invention.
FIG. 3 is a schematic plan view showing a liquid crystal display panel of a
liquid crystal display according to example 2 of the invention.
FIGS. 4(a) and (b) are schematic sectional views showing a liquid crystal
display panel of a liquid crystal display according to example 2 of the
invention.
FIG. 5 is a schematic plan view showing a liquid crystal display panel of a
liquid crystal display according to example 3 of the invention.
FIG. 6 is a partially enlarged plan view showing a liquid crystal display
panel of a liquid crystal display according to example 3 of the invention.
FIG. 7 is a schematic sectional view showing a liquid crystal display panel
of a liquid crystal display according to example 3 of the invention.
FIG. 8 is a partially enlarged plan view showing a liquid crystal display
panel of a liquid crystal display according to example 4 of the invention.
FIG. 9 is a schematic sectional view showing a liquid crystal display panel
of a liquid crystal display according to example 4 of the invention.
FIG. 10 is a partially enlarged plan view showing a liquid crystal display
panel of a liquid crystal display according to example 5 of the invention.
FIG. 11 is a schematic sectional view showing a liquid crystal display
panel of a liquid crystal display according to example 5 of the invention.
FIG. 12 is a schematic view showing an arrangement of an ultraviolet ray
irradiator used in manufacturing a liquid crystal display according to
example 6 of the invention.
FIGS. 13(a) and (b) are schematic views showing an arrangement of an
ultraviolet ray irradiation device used in manufacturing a liquid crystal
display according to example 7 of the invention.
FIG. 14 is a schematic view showing an arrangement of another ultraviolet
ray irradiation device used in manufacturing a liquid crystal display
according to example 7 of the invention.
FIGS. 15(a) and (b) are schematic views showing an arrangement of an
ultraviolet ray irradiation device used in manufacturing a liquid crystal
display according to example 8 of the invention.
FIG. 16 is a schematic view showing an arrangement of an ultraviolet ray
irradiation device used in manufacturing a liquid crystal display
according to example 9 of the invention.
FIG. 17 is a schematic plan view showing a liquid crystal display panel of
a liquid crystal display of this type according to the prior art.
FIGS. 18(a) and (b) are schematic sectional views showing a liquid crystal
display panel of a liquid crystal display according to the prior art.
DESCRIPTION OF THE PREFERRED EMBODIMENT
EXAMPLE 1
A liquid crystal display being an example according to the invention is
hereinafter described with reference to the drawings. FIG. 1 is a
schematic plan view showing a liquid crystal display panel of a liquid
crystal display according to example 1 of the invention, FIG. 2(a) is a
schematic sectional view taken along the line A--A of FIG. 1, and FIG.
2(b) is a schematic sectional view taken along the line B--B of FIG. 1.
In the drawings, reference numerals 1 and 2 indicate a first substrate and
a second substrate oppositely arranged; numeral 3a indicates a shade film
formed on the first substrate 1; numeral 3b indicates a shade film formed
on the second substrate 2; and numeral 4 indicates a seal resin of
ultraviolet ray hardening type for adhering the first substrate 1 and the
second substrate 2 arranged oppositely to each other so that which a
liquid crystal is sealed between the first substrate 1 and the second
substrate 2. Numeral 5 indicates a display electrode for displaying a
picture formed on the second substrate 2; numeral 6 indicates a display
electrode formed on the outside of a display region of the second
substrate 2, electrode leading wire, insulating film and others.
(hereinafter referred to as electrode leading wire, etc.). In the region
indicated as 6, due to the wiring of the shade film or to reflection of
the ultraviolet rays occurring as a result of lamination of the
transparent film, the ultraviolet rays are partially shaded. Numeral 7
indicates ultraviolet rays with which the seal resin 4 is irradiated for
hardening. P indicates a width of a region where a film for shading the
periphery of the display region (periphery shading film) of the liquid
crystal display panel is formed. Q indicates a width of a transmission
region of the ultraviolet rays 7 with which the seal resin 4 is irradiated
for hardening.
In the liquid crystal display according to this example, as a periphery
shading film for shading the periphery of the display region, the shade
film 3a is formed on the first substrate 1 extending continuously from the
outer edge portion of the display region to a predetermined region, and
the shade film 3b is formed on the second substrate 2 arranged oppositely
to the first substrate 1. The width P of the periphery shading film formed
in this manner is a width formed by putting together a width of the shade
film 3a formed on the first substrate 1 and a width of the shade film 3b
formed on the second substrate 2. In the first substrate 1, a transparent
portion having the width Q corresponding to the portion of the second
substrate 2 where shade film 3b is formed, is formed, and the seal resin 4
is irradiated with the ultraviolet rays 7 through this transparent
portion.
In this example, since the periphery shading films (shade films 3a and 3b)
of the display region are alternately formed on the first substrate 1
(shade film 3a) and second substrate 2 (shade film 3b) oppositely
arranged, and the periphery shading films are formed on the second
substrate 2 side in the region where seal resin 4 is irradiated with the
ultraviolet rays 7, whereby the transparent portion (width Q) for
irradiating the seal resin 4 with the ultraviolet rays 7 can be formed on
the first substrate 1 side in the region (width P) where the periphery
shading films (shade films 3a and 3b) are formed. As a result, the width
of the frame region of the outer periphery of the display region can be
equivalent to the width P of the region where the periphery shading films
are formed, and it is possible to achieve a small-sized liquid crystal
display by making the frame region small. As the region (width P) where
the periphery shading films of the display region are formed is
sufficiently secured, it is possible to prevent the peripheral portion of
the display region from light leak.
EXAMPLE 2
FIG. 3 is a schematic plan view showing a liquid crystal display panel of a
liquid crystal display according to example 2 of the invention, FIG. 4(a)
is a schematic sectional view taken along the line C--C of FIG. 3, and
FIG. 4(b) is a schematic sectional view taken along the line D--D of FIG.
3.
In the liquid crystal display according to this example, at the portion
where the electrode leading wire, etc. 6 are not formed on the second
substrate 2 shown in FIG. 4(a), the shade film 3a is formed on the first
substrate 1 extending continuously from the outer edge portion of the
display region to the end of the substrate to serve as a periphery shading
film of the display region, and the irradiation of the seal resin 4 with
the ultraviolet rays 7 is performed from the second substrate 2 side.
In the liquid crystal display according to this example, at the portion
where the electrode leading wire, etc. 6 are formed on the second
substrate 2 shown in FIG. 4(b), the shade film 3a is formed on the first
substrate 1 extending continuously from the outer edge portion of the
display region to the predetermined portion to serve as a periphery
shading film of the display region, and the shade film 3b is formed on the
second substrate 2 arranged oppositely to the first substrate 1. The width
P of the periphery shading films formed in this manner is a width formed
by putting together the width of the shade film 3a formed on the first
substrate 1 and the width of the shade film 3b formed on the second
substrate. In the first substrate 1, a transparent portion having a width
Q corresponding to the portion where the shade film 3b of the second
substrate 2 is formed, is formed on the outside of the shade film 3a. And
the seal resin 4 is irradiated with the ultraviolet rays 7 from the first
substrate 1 side through this transparent portion.
In this example, at the portion where the electrode leading wire, etc. 6
are not formed on the second substrate 2 shown in FIG. 4(a), by forming
the periphery shading film on the first substrate 1 and by performing the
irradiation of the seal resin 4 with the ultraviolet rays 7 from the
second substrate 2 side, the entire region (width P) where the periphery
shading film (shade film 3a) is formed can be used as the transparent
portion (width Q) for irradiating the seal resin 4 with the ultraviolet
rays 7. In the portion where the electrode leading wire, etc. 6 are formed
on the second substrate 2 shown in FIG. 4(b), by forming alternately the
periphery shading films of the display region on the first substrate 1
(shade film 3a) and on the second substrate 2 (shade film 3b) arranged
oppositely, and by forming the periphery shading film on the second
substrate 2 in the region where the seal resin 4 is irradiated with the
ultraviolet rays 7, it is possible to provide the transparent portion
(width Q) for irradiating the seal resin 4 with the ultraviolet rays 7
within the region (width P) where the periphery shading films (shade films
3a and 3b) are formed. As a result, the width of the frame region of the
outer periphery of the display region can be equivalent to the width P of
the region where the periphery shading films are formed, and it is
possible to achieve a small-sized liquid crystal display by making the
frame region small. As the region (width P) where the periphery shading
films of the display region are formed is sufficiently secured, it is
possible to prevent the peripheral portion of the display region from
light leak.
EXAMPLE 3
FIG. 5 is a schematic plan view showing a liquid crystal display panel of a
liquid crystal display according to example 3 of the invention, FIG. 6 is
an enlarged view of a part E of FIG. 5, and FIG. 7 is a schematic
sectional view taken along the line F--F of FIG. 6.
In the drawings, reference numeral 9a indicates a slit for transmission of
the ultraviolet rays formed in the shade film 3a of the first substrate 1,
and numeral 9b indicates a slit for transmission of the ultraviolet rays
formed in electrode leading wire, etc. 10 having a shading characteristic
among the electrode leading wires, etc. 6 provided in the periphery of the
second substrate 2. In addition, when the slit 9b is formed in fine wiring
portion, it is necessary to form it considering that electric resistance
value of the wiring is not influenced. Description of the same parts and
portions as those in FIGS. 1 and 2 are omitted herein just by designating
the same reference numerals thereto.
In the liquid crystal display according to this example, at the portion
where the electrode leading wire, etc. 6 are not formed on the second
substrate 2, the shade film 3a is formed on the first substrate 1
extending continuously from the outer edge portion of the display region
to the end of the substrate to serve as a periphery shading film of the
display region. In the portion where the electrode leading wire, etc. 6
are formed on the second substrate 2 shown in FIG. 6, at the portion to
which the seal resin 4 of the shade film 3a formed continuously from the
outer edge portion of the display region to the end of the substrate on
the first substrate 1 is applied, the slit 9a for transmission of
ultraviolet rays having an opening width "a" and an interval "b" is
formed. At the portion formed in the peripheral portion of the second
substrate 2 and to which the seal resin 4 of the electrode leading wire,
etc. 10 having a shading characteristic is applied, the slit 9b having an
opening width "a" and an interval "b" is arranged in such a manner as to
be alternate with the slit 9a provided in the shade film 3a and to be
continuous when the first substrate 1 and the second substrate 2 are
arranged oppositely, as shown in FIG. 7. The irradiation of the seal resin
3 with the ultraviolet rays 7 is performed from two sides of the first
substrate 1 and second substrate 2 arranged oppositely, and the entire
seal resin 4 is irradiated with the ultraviolet rays 7 through the slits
9a and 9b.
In this example, When the periphery shading film (shade film 3a) of the
display region is formed on the first substrate 1 having the width P and
the films having a transmission characteristic (shade film 3a and
electrode leading wire, etc. 10) are formed on both first substrate 1 and
second substrate 2 at the portion where the seal resin 4 is applied, by
providing the slits 9a and 9b for transmission of ultraviolet rays on the
shade film 3a and the electrode leading wire, etc. 10 in such a manner as
to be alternately continuous, and by performing the irradiation of the
seal resin 4 with the ultraviolet rays 7 from both sides of the first
substrate 1 and the second substrate 2 arranged oppositely through the
slits 9a and 9b, it becomes possible to provide a transparent portion
(slits 9a and 9b) for irradiating the seal resin 4 with the ultraviolet
rays 7 within the region (width P) where the shading films are formed. As
a result, the width of the frame region of the outer periphery of the
display region can be equivalent to the width P of the region where the
periphery shading films are formed, and it is possible to achieve a
small-sized liquid crystal display by making the frame region small. As
the region (width P) where the periphery shading films of the display
region are formed is sufficiently secured, it is possible to prevent the
peripheral portion of the display region from light leak.
EXAMPLE 4
In the foregoing example 3, the slit 9a provided in the shade film 3a
formed on the first substrate 1 and the slit 9b provided in the electrode
leading wire, etc. 10 formed on the second substrate 2 arranged oppositely
to the first substrate 1 and having a shading characteristic are arranged
alternately such that opening portions thereof are continuous. On the
other hand, in this example 4, as shown in FIGS. 8 and 9, the opening
width "a" of the slit 11a provided in the shade film 3a and the opening
width "b" of the slit 11b provided in the electrode leading wire 10 are
reduced by a predetermined amount, and therefore when arranging oppositely
the first substrate 1 and the second substrate 2, the opening portions of
the slits 10a and the 10b are discontinuous.
FIGS. 8 and 9 show example 4, and in which FIG. 8 is an enlarged view of a
part corresponding to E of FIG. 5, and FIG. 9 is a schematic sectional
view taken along the line G--G of FIG. 8.
In the drawings, reference numeral 11a indicates a slit for transmission of
ultraviolet rays formed in the shade film 3a of the first substrate 1;
numeral 11b is a slit for transmission of ultraviolet rays formed in the
electrode leading wire, etc. 10 having a shading characteristic provided
in the peripheral portion of the second substrate; "a" indicates an
opening width of the slit 11a; "b" indicates an opening width of the slit
11b; and "c" indicates a width of a distance in opening portion between
the slit 11a provided in the first substrate 1 and the slit 11b provided
in the second substrate 2 when the first substrate 1 and the second
substrate 2 are arranged oppositely, in other word, "c" is an overlapping
portion formed in which the films having the shading characteristic (shade
film 3a and the electrode leading wire, etc. 10) in the first substrate 1
and the second substrate 2 are formed to be overlapped. This width "c" of
the overlapping portion is determined considering an amount being able to
harden the seal resin 4 at the overlapping portion of the films having the
shading characteristic by oblique incident light of the ultraviolet rays 7
at the time of irradiating the seal resin 4 and scattered light at the
seal resin 4 portion.
In this example, not only the same advantage as that in example 3 is
achieved, it is possible to have an allowance in alignment of overlapping
the first substrate 1 and the second substrate 2.
EXAMPLE 5
Though, in example 3, the slits 9a and 9b provided in the shade film 3a
formed on the first substrate 1 and in the electrode leading wire, etc. 10
having a shading characteristic formed on the second substrate 2 arranged
oppositely to the first substrate 1 are formed to be linear at the portion
where the seal resin 4 is applied, as shown in FIGS. 10 and 11, it is also
preferable that they are formed to be slits 12a and 12b of any secondary
dimensional shape considering appearance and function. In this case, the
same advantage as that in example 3 is achieved, and it is possible to
improve in prevention of refractive scattered light from slit edge, and in
applicability and adherence of the seal resin 4.
EXAMPLE 6
FIG. 12 is a schematic view to explain a method of irradiating the seal
resin 4 of ultraviolet ray hardening type used for adhering the first
substrate 1 and the second substrate 2 arranged oppositely and forming a
liquid crystal display panel with the ultraviolet rays 7. In the drawing,
reference numeral 1 indicates a first substrate, numeral 2 indicates a
second substrate, numeral 4 is a seal resin of ultraviolet ray hardening
type, and numeral 14 is an overlapped substrate comprising the first
substrate 1 and the second substrate 2 arranged oppositely. Numeral 15 is
an ultraviolet lamp, numeral 16 is an ultraviolet ray transmission plate
for supporting the overlapped substrate 14 and through which ultraviolet
rays can transmit, and numeral 17 is an alignment mechanism.
The seal resin 4 in manufacturing the liquid crystal display according to
this example is irradiated with the ultraviolet rays 7 from two sides of
the overlapped substrate 14 simultaneously on the entire two surfaces,
when it is necessary to irradiate the two sides of the overlapped
substrate 14 with the ultraviolet rays 7.
In this example, when it is necessary to irradiate the two surfaces of the
overlapped substrate 14 with the ultraviolet rays 7 for the irradiation of
the seal resin 4 of ultraviolet ray hardening type held between the first
substrate 1 and the second substrate 2, the hardening of the seal resin 4
with the ultraviolet rays can be performed in a short time.
EXAMPLE 7
Though, in example 6, the irradiation of the seal resin 4 with the
ultraviolet rays 7 is performed from both sides of the overlapped
substrate 14 simultaneously on the entire two surfaces, the irradiation is
performed alternately one side after another in this example 7 as shown in
FIG. 13 and FIG. 14.
In the method of irradiating the seal resin 4 with the ultraviolet rays 7
in the manufacturing method according to this example, in order to
irradiate the two surfaces of the overlapped substrate 14 with the
ultraviolet rays 7, an ultraviolet ray irradiator comprises two sections
as shown in FIG. 13. First using an apparatus formed as shown in FIG.
13(a), one side (the second substrate 2 side in this example) of the
overlapped substrate 14 is irradiated with the ultraviolet rays 7, then
after moving the substrate to another apparatus formed as shown in FIG.
13(b), another side (the second substrate 1 side in this example) is
irradiated with the ultraviolet rays 7.
In the irradiation method shown in FIG. 14, first one side (the second
substrate 2 side in this example) of the overlapped substrate 14 is
irradiated with the ultraviolet rays 7, then after turning over the
overlapped substrate 14, another side (the second substrate 1 side in this
example) is irradiated with the ultraviolet rays 7.
In this example, even when it is necessary to perform the irradiation of
the seal resin 4 of ultraviolet ray hardening type held between the first
substrate 1 and the second substrate 2 with the ultraviolet rays 7 on both
surfaces of the overlapped substrate 14, arrangement of the ultraviolet
ray irradiator can be simplified. In the method shown in FIG. 14, the
irradiator can be formed into a single apparatus.
EXAMPLE 8
FIG. 15 shows views each to explain a method of irradiating the seal resin
4 of ultraviolet ray hardening type used for adhering oppositely the first
substrate 1 and the second substrate 2 forming a liquid crystal display
panel with the ultraviolet rays 7 in the manufacturing process of the
liquid crystal display described in examples 1, 2, 3, 4 and 5, and in
which FIG. 15(b) is a plan view of a shade plate disposed in FIG. 15(a).
In the drawings, reference numeral 18 is a shade plate having a shade film
in a region other than that required in transmission of the ultraviolet
rays 7 to harden the seal resin 4, and is arranged on the ultraviolet ray
transmission plate 16 in an overlapping manner.
In the irradiation method of the seal resin 4 with the ultraviolet rays 7
in the manufacture of the liquid crystal display according to this
example, the irradiation is performed through the shade plate 18 provided
with the shade film in the region other than that required to transmit the
ultraviolet rays 7 for hardening of the seal resin 4.
In addition, the shade plate 18 provided with the shade film according to
this example can be applied to the apparatus having an arrangement shown
in examples 6 and 7.
In this example, since the irradiation is performed through the shade plate
18 provided with the shade film in the region other than that required to
transmit the ultraviolet rays 7 for hardening of the seal resin 4,
essential elements (such as display electrode, orientation film for liquid
crystal, etc.) involved in the display characteristic of the liquid
crystal display are free from influences of the irradiation with the
ultraviolet rays.
EXAMPLE 9
Though, in example 8, the irradiation of the overlapped substrate 14 with
the ultraviolet rays 7 is performed through the shade plate 18 provided
with the shade film in the region other than that required to transmit the
ultraviolet rays 7 for hardening of the seal resin 4, the same advantage
as that in example 8 can be achieved by irradiating only the region
required for hardening the seal resin 4 by leading the ultraviolet rays 7
emitted from the ultraviolet lamp 15 through a fiber 19 or the like as
shown in FIG. 16.
EXAMPLE 10
Though, in each of the foregoing examples, a resin of ultraviolet ray
hardening type is used as the seal resin 4 for adhering in an opposite
manner the first substrate 1 and the second substrate 2 forming a liquid
crystal display panel of the liquid crystal display, a seal resin of
ultraviolet ray reaction inducing thermosetting type (such as acrylic or
epoxy mixed resin) is used in this example.
In the seal resin of ultraviolet ray reaction inducing thermosetting type,
hardening reaction is induced by the irradiation with ultraviolet rays,
and is accelerated by heat treatment.
It should be understood that the foregoing relates to only several examples
of the invention and that various changes and modifications may be made in
the invention without departing from the spirit and scope thereof.
*
