JP3327124B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a liquid crystal display device.

[0002]

2. Description of the Related Art In general, in an active matrix type liquid crystal display device, a switching element is provided for each pixel area, and a liquid crystal is filled between one element substrate on which a matrix array is formed and an opposite substrate on the other side. In advance,
Predetermined information is displayed by controlling the alignment state of the liquid crystal for each pixel region. Here, as a switching element, T
Although a three-terminal element such as an FT (Thin Film Transitor) or a two-terminal element such as an MIM-type nonlinear element is used, the MIM-type non-linear element is required in order to respond to the demand for a larger screen and lower cost for a liquid crystal display device. It is more advantageous to use Also, when an MIM type nonlinear element is used,
Since the data lines can be provided on one element substrate on which the matrix array is formed and the scanning lines can be provided on the other opposing substrate, there is an advantage that a crossover short circuit between the scanning lines and the data lines does not occur.

A conventional active matrix type polymer dispersion type liquid crystal display device 500 using such an MIM type nonlinear element has a MIM type as shown in FIG.
A dimming layer made of a polymer dispersed liquid crystal in which a polymer and a liquid crystal are aligned with each other is provided between the element substrate 100 and the counter substrate 200.

The MIM element substrate 100 is a glass substrate 10
And a driver 30 and a plurality of electrodes 32 connected to the driver 30 and extending in a vertical direction on the paper surface. The opposing substrate 200 includes a glass substrate 20, a driver 40, and a plurality of electrodes 42 connected to the driver 40 and extending in the left-right direction of the drawing. An MIM type nonlinear element (not shown) is provided on the MIM element substrate 100 at a position corresponding to each intersection of the electrode 32 and the electrode 42.

When forming an MIM type nonlinear element, the electrode 3
It is necessary to pass a current through the MIM element substrate 10.
After assembling the panel with the counter substrate 200 and the counter substrate 200, the end 34 of the electrode 32 is connected to the end surface 12 of the glass substrate 10 for the convenience of conducting a current to the panel and testing display defects of the panel.
Extends to Similarly, the end portion 44 of the electrode 42 also extends to the end surface 24 of the glass substrate 20 for the convenience of conducting a test on a display failure or the like by energizing the panel. Then, for convenience in assembling the glass substrate 10 and the glass substrate 20, the end surface 12 of the glass substrate 10 and the end surface 22 of the glass substrate 20, and the end surface 14 of the glass substrate 10 and the end surface 24 of the glass substrate 20 are respectively combined. It has a configuration.

[0006]

However, in the liquid crystal display device having such a configuration, white turbid portions 210 and 220 are formed near the end faces 12 and 22 and near the end faces 14 and 24, respectively.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a liquid crystal display device which suppresses the formation of a cloudy portion at an end of a liquid crystal display panel.

[0008]

According to the present invention, there is provided a first substrate, a second substrate provided opposite to the first substrate, a first main surface of the first substrate, and a first substrate. A light control layer provided between the second main surface of the second substrate and the light control layer, wherein the light control layer has a liquid crystal and a polymer, and the liquid crystal and the polymer are Being oriented with respect to each other, the first substrate has a first end surface, the second substrate has a second end surface corresponding to the first end surface, and the first substrate has a second end surface. A plurality of first electrodes are provided on one main surface, and the first end face and the first end face are provided to prevent white turbidity caused by misalignment of the orientation state of the polymer due to static electricity coming from the first electrodes. At least one of the second end faces is provided so as to protrude from a first end of the plurality of first electrodes on the first end face side. It is characterized in that is.

Further, one of the first end face and the second end face is provided so as to protrude from the first end,
The other end of the first end face and the second end face is aligned with the position of the first end.

Further, both the first end face and the second end face are provided so as to protrude from the first end.

The first substrate has a third end surface, the second substrate has a fourth end surface corresponding to the third end surface, and the second substrate has a second end surface. A plurality of second electrodes are provided on a main surface of the second electrode, and at least one of the third end face and the fourth end face is a second end of the plurality of second electrodes on the fourth end face side. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is provided so as to protrude further.

One of the third end surface and the fourth end surface is provided so as to protrude from the second end portion,
5. The liquid crystal display device according to claim 4, wherein a position of the other of the third end surface and the fourth end surface is aligned with a position of the second end. 6.

5. The liquid crystal display device according to claim 4, wherein both the third end face and the fourth end face are provided so as to protrude from the second end.

7. The liquid crystal display according to claim 1, wherein the light control layer containing the liquid crystal is composed of a polymer dispersed liquid crystal containing a liquid crystal and a polymer. apparatus.

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a view for explaining a liquid crystal display device according to a first embodiment of the present invention. FIG. 1A is a plan view, and FIG. 1B is B1 in FIG. 1A. FIG. 1C is a cross-sectional view taken along line C1-C1 of FIG. 1A, FIG. 2 is an enlarged plan view of a portion A of FIG. 1, and FIG.
FIG. 4 is a partial enlarged plan view, and FIG. 4 is a sectional view taken along line X4-X4 of FIG.

The liquid crystal display device 500 of the present embodiment
An active matrix type polymer-dispersed liquid crystal display device using an IM type nonlinear element as a switching element and a polymer-dispersed liquid crystal in which a polymer and a liquid crystal are aligned with each other as a light control layer.

As shown in FIGS. 1A to 1C, in this liquid crystal display device 500, a dimming layer made of a polymer dispersed liquid crystal in which a polymer and a liquid crystal are aligned with each other is provided between an MIM element substrate 100 and a counter substrate 200. Is provided. The MIM element substrate 100 includes a glass substrate 10, a driver 30, and a plurality of electrodes 32 connected to the driver 30 and extending in a vertical direction on the paper surface. The opposing substrate 200 includes a glass substrate 20, a driver 40, and a plurality of electrodes 42 connected to the driver 40 and extending in the left-right direction of the drawing.

As shown in FIG. 2, a pixel 50 is provided on the MIM element substrate 100 at a position corresponding to each element of the matrix constituted by the electrodes 32 and the electrodes 42. The driver 30 is connected to the electrode 32 and to the driving electrode 36.

As shown in FIG. 3, each pixel 50 includes a Cr reflective pixel electrode 52 and a MIM type nonlinear element 60, and the Cr reflective pixel electrode 52 is connected to the electrode 32 via the MIM type nonlinear element 60. Have been.

As shown in FIG. 4, the MIM element substrate 100
1, a tantalum oxide film 11 is provided on a glass substrate 10. A tantalum electrode 31 is provided on the tantalum oxide film 11, and a tantalum oxide film 33 formed by anodizing the surface of the tantalum electrode 31 is formed on the tantalum electrode 31.
A Cr reflection pixel electrode 52 is provided on the tantalum oxide film 33, and the MIM type nonlinear element 60 is constituted by the tantalum electrode 31, the tantalum oxide film 33 and the Cr reflection pixel electrode 52. Then, the MIM element substrate 1
An alignment film 72 is provided on the uppermost part of 00.

On the other hand, in the counter substrate 200, an ITO (Indium Tin Oxide) electrode is provided on the glass substrate 20, and an alignment film 74 is provided on the ITO electrode 21. This ITO electrode 21 corresponds to the electrode 42 shown in FIG.

Between the MIM element substrate 100 and the opposing substrate 200, a polymer dispersed liquid crystal 80 in which a polymer and a liquid crystal are aligned with each other is used as a light control layer. This polymer dispersed liquid crystal 80 is formed as follows. First, the glass substrate 10 on which the alignment film 72 is formed and rubbed is applied.
An empty panel is formed by the rubbing treatment and the glass substrate 20 on which the alignment film 74 is formed, and then the liquid crystal and the polymer precursor (monomer) are placed between the glass substrate 10 and the glass substrate 20 in a vacuum. To be sealed. After the sealing, the liquid crystal and the polymer precursor are in a state of being mutually aligned between the glass substrate 10 and the glass substrate 20. Thereafter, the polymer precursor (monomer) is polymerized by irradiating ultraviolet rays to obtain a polymer dispersed liquid crystal 80 in which the polymer and the liquid crystal are aligned with each other.

Referring again to FIGS. 1A to 1C, in the liquid crystal display device 500 of the present embodiment, the end 34 of the electrode 32
Extends to the end face 12 of the glass substrate 10, but the end face 22 of the glass substrate 20 protrudes from the end face 12 of the glass substrate 10 and the end 34 of the electrode 32 by a distance a.
As a result, it becomes difficult for static electricity due to peeling electrification to enter the electrode 32, and generation of a cloudy portion on the end surfaces 12 and 22 is suppressed. The end 44 of the electrode 42 extends to the end surface 24 of the glass substrate 20, but the end 44 of the electrode
Is the end face 24 of the glass substrate 20 and the end 44 of the electrode 42
From the distance b. As a result, it becomes difficult for static electricity due to peeling electrification to enter the electrode 42, and the end faces 14, 2
The formation of a cloudy portion on the fourth side is suppressed.

(Second Embodiment) FIGS. 5A and 5B are diagrams for explaining a liquid crystal display device according to a second embodiment of the present invention. FIG. 5A is a plan view, and FIG. FIG. 5C is a sectional view taken along line C5-C5 of FIG. 5A.

In this embodiment, the end 34 of the electrode 32 extends to the end face 12 of the glass substrate 10, but the end face 22 of the glass substrate 20 is formed by the end face 12 of the glass substrate 10 and the end 34 of the electrode 32. A point protruding a distance a from
And the end 44 of the electrode 42 is the end face 24 of the glass substrate 20.
This is the same as in the first embodiment except that the end face 14 of the glass substrate 10 is aligned with the end 44 of the electrode 42 and the end face 24 of the glass substrate 20, so that the end face 2
4 differs from the first embodiment in that it does not protrude from the fourth embodiment. The other points are the same as in the first embodiment.

In the present embodiment, the static electricity due to the peeling charging becomes less likely to enter the electrode 32, and the formation of the cloudy portion on the end faces 12 and 22 is suppressed.

(Third Embodiment) FIG. 6 is a sectional view illustrating a liquid crystal display device according to a third embodiment of the present invention.

In this embodiment, the end surface 22 of the glass substrate 20 projects from the end 34 of the electrode 32 by a distance a, and the end surface 12 of the glass substrate 10 also projects from the end 34 of the electrode 32 by a distance a. Although different from the first embodiment, other points are the same. Also in this case, the static electricity due to the peeling charge is less likely to enter the electrode 32, and the end face 1
The generation of white turbid portions on the sides 2 and 22 is suppressed.

(Fourth Embodiment) FIG. 7 is a sectional view for explaining a liquid crystal display device according to a fourth embodiment of the present invention.

In this embodiment, the end face 22 of the glass substrate 20 is aligned with the end 34 of the electrode 32 and does not protrude from the end 34, but the end face 12 of the glass substrate 10 is separated from the end 34 of the electrode 32. The difference from the first embodiment lies in the point that it protrudes by the distance a, but the other points are the same. Also in this case, the static electricity due to the peeling charge is less likely to enter the electrode 32, and the generation of the cloudiness on the end surfaces 12 and 22 is suppressed.

(Fifth Embodiment) FIG. 8 is a sectional view for explaining a liquid crystal display device according to a fifth embodiment of the present invention.

In this embodiment, the end surface 14 of the glass substrate 10 projects from the end 44 of the electrode 42 by a distance b, and the end surface 24 of the glass substrate 20 also projects from the end 44 of the electrode 42 by a distance b. Although different from the first embodiment, other points are the same. Also in this case, the static electricity due to the peeling charge is less likely to enter the electrode 42, and the end face 1
The generation of cloudiness on the sides 4 and 24 is suppressed.

(Sixth Embodiment) FIG. 9 is a sectional view for explaining a liquid crystal display device according to a sixth embodiment of the present invention.

In this embodiment, the end face 14 of the glass substrate 10 is aligned with the end 44 of the electrode 42 and does not protrude from the end 44, but the end face 24 of the glass substrate 20 is separated from the end 44 of the electrode 42. The difference from the first embodiment lies in the point that it protrudes by the distance b, but the other points are the same. Also in this case, the static electricity due to the peeling charge is less likely to enter the electrode 42, and the formation of the cloudy portion on the end faces 14, 24 is suppressed.

In each of the above embodiments, the value of a is preferably 0.3 to 3 mm, more preferably
0.4 to 4 mm, more preferably 0.5 to 2 m
m. The value of b is also preferably 0.3 to 3 mm,
More preferably, it is 0.4 to 4 mm, further preferably, 0.5 to 2 mm. If the thickness is less than 0.3 mm, the effect of suppressing static electricity from entering the electrode is small, and the effect is 5 mm.
If it exceeds, useless parts will increase.

In each of the above embodiments, the liquid crystal display device controlled by the MIM type nonlinear element has been described as an example, but the present invention can be applied to a simple matrix type liquid crystal display device. In each of the above embodiments, a dimming layer made of a polymer dispersed liquid crystal in which a polymer and a liquid crystal are aligned with each other is provided between the MIM element substrate 100 and the counter substrate 200 using the alignment film. The present invention can be applied to a polymer dispersion type liquid crystal display device without using an alignment film, and the dimming layer is composed of liquid crystal without using a polymer. It is also applicable to liquid crystal display devices.

[0046]

According to the present invention, it is possible to provide a liquid crystal display device having excellent display quality by suppressing the formation of white turbid portions at the edges of the liquid crystal display device panel.

[Brief description of the drawings]

FIGS. 1A and 1B are views for explaining a liquid crystal display device according to a first embodiment of the present invention. FIG. 1A is a plan view, and FIG.
1B is a sectional view taken along line B1-B1 of FIG. 1A, and FIG. 1C is a sectional view taken along line C1-C1 of FIG. 1A.
It is a line sectional view.

FIG. 2 is an enlarged plan view of a portion A in FIG.

FIG. 3 is an enlarged plan view of a portion B in FIG. 2;

FIG. 4 is a sectional view taken along line X4-X4 of FIG. 3;

5A and 5B are views for explaining a liquid crystal display device according to a second embodiment of the present invention, wherein FIG. 5A is a plan view and FIG.
5A is a sectional view taken along line B5-B5, and FIG. 5C is a sectional view taken along line C5-C5 of FIG. 5A.
It is a line sectional view.

FIG. 6 is a cross-sectional view illustrating a liquid crystal display device according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a liquid crystal display device according to a fourth embodiment of the present invention.

FIG. 8 is a cross-sectional view illustrating a liquid crystal display device according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view illustrating a liquid crystal display device according to a sixth embodiment of the present invention.

10A and 10B are views for explaining a conventional liquid crystal display device, FIG. 10A is a plan view, and FIG. 10B is B10- in FIG. 10A.
FIG. 10C is a cross-sectional view taken along line B10, and FIG.
It is a line sectional view.

[Explanation of symbols]

 10, 20: Glass substrate 11: Tantalum oxide film 12, 14, 22, 24: End face 21: ITO electrode 30, 40: Driver 31: Tantalum electrode 32, 42 ... Electrode 33: Tantalum oxide film 34, 44 ... End 36 ... Driving electrode 50 ... Pixel 52 ... Cr reflective pixel electrode 60 ... MIM type nonlinear element 72,74 ... Alignment film 80 ... Polymer dispersion type liquid crystal 100 ... MIM element substrate 200 ... Counter substrate 210,220 ... White opaque part 500 ... Liquid crystal Display device

Continuation of the front page (72) Inventor Tetsuya Daitsu 3-5-5 Yamato, Suwa-shi, Nagano Seiko Epson Corporation (56) References JP-A-7-120762 (JP, A) JP-A-58- 28721 (JP, A) JP-A-6-281942 (JP, A) JP-A-7-49657 (JP, A) JP-A 1-154023 (JP, A) JP-A-7-84273 (JP, A) JP-A-4-245223 (JP, A) JP-A-7-218915 (JP, A) JP-A-53-16647 (JP, A) JP-A-2-301722 (JP, A) JP-A-3-119830 (JP, U) Japanese Utility Model 63-128528 (JP, U) Japanese Utility Model Application Hei 2-62517 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1334 G02F 1 / 1345 G02F 1/136

Claims (6)

(57) [Claims] A first substrate, a second substrate provided to face the first substrate, a first main surface of the first substrate, and a second substrate of the second substrate. A light control layer provided between the liquid crystal display device and the main surface, wherein the light control layer includes a liquid crystal and a polymer, and the liquid crystal and the polymer are aligned with each other; One substrate has a first end surface; the second substrate has a second end surface corresponding to the first end surface; and a plurality of substrates on the first main surface of the first substrate. A first electrode is provided, and at least one of the first end face and the second end face is provided to prevent clouding caused by a shift in the orientation state of the polymer due to static electricity coming from the first electrode. A first electrode on the first end surface side of the plurality of first electrodes;
The liquid crystal display device is provided so as to protrude from an end of the liquid crystal display. 2. One of the first end face and the second end face is provided so as to protrude from the first end, and the other of the first end face and the second end face and the second end face. 1
2. The liquid crystal display device according to claim 1, wherein the positions of the ends are aligned. 3. The liquid crystal display device according to claim 1, wherein both the first end face and the second end face are provided so as to protrude from the first end. 4. The first substrate has a third end surface, the second substrate has a fourth end surface corresponding to the third end surface, and the second substrate has a second end surface. A plurality of second electrodes are provided on a main surface of the second electrode, and at least one of the third end face and the fourth end face is a second end of the plurality of second electrodes on the fourth end face side. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is provided so as to protrude further. 5. One of the third end surface and the fourth end surface is provided so as to protrude from the second end portion, and the other position of the third end surface and the fourth end surface and the position of the third end surface and the fourth end surface are different from each other. 2
The liquid crystal display device according to claim 4, wherein the positions of the end portions are aligned. 6. The liquid crystal display device according to claim 4, wherein both the third end face and the fourth end face are provided so as to protrude from the second end.