JPH11119230A - Liquid crystal display device and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the display quality of a liquid crystal display device(LCD) and to improve its productivity, by preventing wiring on an array substrate from being cut off or short-circuited due to burrs generated in a light shielding film on a counter substrate in the case of molding the external shape by breaking a liquid crystal (LC) cell formed by mutually sticking the array substrate and the counter substrate. SOLUTION: A black matrix(BM) 32 is arranged on the counter substrate 22 so that its end part is located in an coated area of a seal agent 44 to prevent the BM 32 from being cut off at the time of molding the outer shape of the LC cell, 1st and 2nd gap holding pillars 43a, 43b are formed on the peripheral, edge of the substrate 22 and the seal member 44 is applied to an area held between these pillars 43a, 43b to uniformly hold the gap of the LC cell at the time of fixing the seal agent 44.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having a light-shielding film and a color filter made of a coloring material on an electrode substrate, and more particularly to a liquid crystal display device and a liquid crystal display device in which the gap between the electrode substrates is kept constant. The present invention relates to an improvement in the production method of

[0002]

2. Description of the Related Art A light-shielding film such as a black stripe or a black matrix and a color filter composed of three primary color materials of red (R), green (G) and blue (B) are provided between the light-shielding films. A color liquid crystal display device (hereinafter, abbreviated as a color LCD) has conventionally been formed as shown in FIGS. That is, a thin film transistor provided at the intersection of the scanning line 2 and the signal line 3 on the transparent first insulating substrate 1) is hereinafter abbreviated as TFT. 3) On the array substrate 7 having the matrix-shaped pixel electrodes 6 driven by 4, and on the transparent second insulating substrate 8, a light-shielding film 10a and three of red (R), green (G), and blue (B) A color filter 10 made of a primary color material 10b and a counter substrate 12 having a counter electrode 11
Are adhered to each other with a sealant 14 via a plastic pearl 13 for holding a gap, and a liquid crystal composition 16 is attached to the gap.
To form a color LCD 17.

At the time of manufacturing, a plurality of array substrates 7 are patterned on a transparent first insulating substrate 1 and a plurality of opposing substrates 12 are patterned on a transparent second insulating substrate 8. Thereafter, a plastic pearl 13 is sprayed on the array substrate 7, a sealant 14 surrounding the periphery of the display area 6 is further applied, the array substrate 7 and the counter substrate 12 are aligned, and the sealant 14 is solidified. First
To an array substrate along the fourth to fourth cutting lines 1a to 1d.
The opposite substrate was broken along a to 8d to form a liquid crystal cell having a desired outer shape, and then the liquid crystal composition 16 was sealed in the gap between the liquid crystal cells.

[0004]

However, in the color LCD 17, the light-shielding film 10a is
The first and second insulating substrates 1 and 8 extend to the outside of the first to fourth cutting lines 12a to 12d.
When the outer shape of the array substrate 7 and the counter substrate 12 is formed, burrs of the light-shielding film 10a are generated, and the burrs come into contact with the array substrate 7 so that the scanning lines 2 or the signal lines 3 on the array substrate 7 are formed. And the like have been cut, and the yield has been reduced due to the occurrence of display defects. When the light-shielding film 10a is made of a conductive material, burrs of the light-shielding film 10a generated at the time of breaking the first insulating substrate 1 and the second insulating substrate 8 cut the scanning lines 2 or the signal lines 3. Even if the scanning line 2 or the signal line 3 is simply contacted, a short circuit occurs between the scanning line 2 and the signal line 3, thereby causing a problem that a display defect occurs and a yield is reduced.

In view of the above, the present invention has been made to solve the above-mentioned problems, and at the time of forming the outer shapes of the array substrate and the counter substrate, the burrs of the light shielding film formed on the counter substrate damage the wiring on the array substrate and cut the wiring. Of a liquid crystal display device having a high production yield and a high production yield without causing an adverse electrical effect on the wiring due to short circuit or short circuit, causing no display failure due to wiring damage. The purpose is to provide a method.

[0006]

According to the present invention, there is provided, as a means for solving the above-mentioned problems, an array having pixel electrodes arranged in a matrix and driven by thin film transistors to which signals are inputted from scanning lines and signal lines. A substrate, a counter substrate that has a counter electrode and is disposed to face the array substrate with a predetermined gap therebetween, a sealant surrounding the gap around the pixel electrode, and a region surrounded by the seal agent. A liquid crystal composition to be enclosed, a color filter layer made of a light-shielding film and a coloring material formed on the counter substrate and arranged so that an end does not extend outside the region where the sealant is disposed, and the sealant. A gap holding column is provided on both sides of the sealant so as to sandwich the gap between the array substrate and the opposing substrate.

According to another aspect of the present invention, there is provided an array substrate having pixel electrodes arranged in a matrix and driven by thin film transistors to which signals are input from scanning lines and signal lines, and a counter electrode. An opposing substrate having a predetermined gap with the array substrate, a sealant surrounding the gap around the pixel electrode, and a liquid crystal composition sealed in a region surrounded by the sealant. And a color filter layer formed of a coloring material and a light-shielding film formed on the counter substrate and having an end not extending outside the region where the sealant is disposed. The pixel electrodes in a matrix shape driven by the thin film transistors to which signals are input from the scanning lines and the signal lines are formed on a first insulating substrate, and the array substrate is formed. Forming a color filter layer made of the light-shielding film and the color material and a color filter layer made of the light-shielding film and a color material and the counter electrode on a second insulating substrate to form the counter substrate, Forming, on both sides of the array substrate and / or the opposing substrate with the sealant disposing region therebetween, gap holding columns for holding the gap between the array substrate and the opposing substrate constant; Coating the array substrate and / or the opposing substrate so as to be located between the gap holding pillars, bonding the array substrate and the opposing substrate with the gap therebetween, And forming a break in the counter substrate into a predetermined shape.

According to the present invention, the color filter layer is formed so as not to extend outside the region where the sealant is disposed, so that the light-shielding film is not broken when the outer shape of the liquid crystal cell is formed. It is an object of the present invention to provide a liquid crystal display device having good display quality and high production yield by preventing display defects such as disconnection or short circuit of wiring due to contact with burrs generated in a film. In addition, since gap holding columns are provided on both sides sandwiching the sealant, the gap between the array substrate and the counter substrate is uniformly held regardless of whether the end portion of the color filter layer exists in the sealant application area. And
It is an object of the present invention to obtain a liquid crystal cell with high manufacturing accuracy and to obtain a liquid crystal display device having good display quality.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in FIGS. 1 and 2 are a schematic sectional view and a plan view, respectively, showing a part of an active matrix type color LCD 18, in which a TFT 2 is used as a driving element.
A liquid crystal composition 29 is sealed in a predetermined gap formed by arranging an array substrate 21 using a substrate 7 and an opposing substrate 22 to face each other.

The array substrate 21 is made of indium tin oxide (hereinafter abbreviated as ITO) driven by a TFT 27 to which signals are inputted from scanning lines 24 and signal lines 26 on a first insulating substrate 23 made of glass. ), A pixel electrode 28 patterned in a matrix, a protective film is formed, and an alignment film 30 made of polyimide is further applied. Reference numeral 30a denotes an auxiliary member, which is in contact with a second gap holding column, which will be described later, at the periphery of the array substrate, and is formed simultaneously with the same member as the scanning line 24 or the signal line 26 and the alignment film 30.

The opposing substrate 22 is a light shielding film on a second insulating substrate 31 made of glass, a black matrix (hereinafter abbreviated as BM) 32 made of chromium (Cr), and a red matrix between the BMs 32. (R), green (G), blue (B)
Of the three primary colors 33, 34, and 35 in a stripe pattern on a color filter 37 via a flattening layer 38.
It has a counter electrode 40 made of TO, and an alignment film 42 made of polyimide is applied on a protective film 41. Note that the end of the color filter 37 extends to an area where a sealant 44 to be described later is applied.

Reference numeral 43a denotes a BM3 at the periphery of the counter substrate 22.
2 and a first gap holding pillar composed of coloring materials 33, 34, 35 and an alignment film 42 laminated thereon.
A layer 50 formed of the same material and having the same thickness as the BM 32 formed in the display area, and a color material 3 laminated thereon;
This is a second column for maintaining a gap, which is composed of 3, 34, 35 and an alignment film 42. Then, the array substrate 21 and the opposing substrate 22
Is fixed with a sealant 44 applied to a region sandwiched between the first and second gap holding columns 43a and 43b, and the liquid crystal composition 29 is sealed in a gap surrounded by the sealant 44. Further, 46 and 47 are deflection plates.

Next, a manufacturing process of the color LCD 18 will be described. First, a film formation technique and a photolithography technique are repeated on a first insulating substrate 23 having a size capable of forming a plurality of array substrates 21, and a scanning line 24, a signal line 26, and a TFT are formed.
27 and the pixel electrode 28 are formed in a plurality of patterns, a protective film and an alignment film 30 are formed on the pattern, and a plurality of array substrate patterns 48 are formed as shown in FIG.

Next, a film having a thickness of 200 as shown in FIG. 4A is formed on a second insulating substrate 31 having a size capable of forming a plurality of opposing substrates 22 by a film forming technique and a photolithography technique.
and a plurality of patterns of BM32 nm.
A layer 50 of the same material and the same thickness as the BM 32 is patterned around the periphery of the BM 32. Next, as shown in FIG. 4B, the BM is formed using a first mask 51 in which a first through hole 51a is formed.
A red (R) color material 33 is applied in a stripe shape to the gap 32. However, a second through hole 51b for a pillar for laminating the coloring materials 33, 34, 35 on the BM 32 and the layer 50 is formed at a position corresponding to the peripheral portion of the BM 32 and the layer 50 of the first mask 51. The red (R) color material 33 is applied on the BM 32 and the layer 50 to a thickness of 1500 nm.

Next, as shown in FIGS. 4C and 4D, like the red (R) color material 33, the first through holes 52a and 53 are formed.
The green (G) and blue (B) color materials 34 are provided in the gaps of the BM 32 by using the second or third masks 52 and 53 in which a is formed.
35 is applied in a stripe shape to form the color filter 37, while the second through holes 52b and 53b for pillars
On the BM 32 and the red (R) color material 33 on the layer 50, green (G) and blue (B) color materials 34 and 35 are formed to a thickness of 1500 n.
m, and then sequentially laminating and coating the first and second gap holding columns 43a and 43b. However, BM32 and layer 5
The heights of the color materials 33 to 35 stacked on 0 are adjusted according to the gap between the array substrate 21 and the counter substrate 22.

Thereafter, as shown in FIG. 4E, an opposing electrode 40 is formed on the color filter 37 with a flattening layer 38 interposed therebetween.
The first and second gap holding pillars 43a are formed around the second insulating substrate 31 on the periphery thereof, as shown in FIG.
A plurality of opposing substrate patterns 58 on which 43b are formed are formed. At this time, the first and second gap holding columns 43a, 43
The height of b is about 4500 nm. It is only necessary that the column for maintaining the gap is formed at least along the side where the lead lines are arranged in the liquid crystal cell.

Thereafter, the alignment films 30 and 42 are subjected to rubbing treatment, respectively, so that the first and second gap holding columns 4 of the counter substrate 22 are formed.
After the sealant 44 is applied to the region sandwiched between 3a and 43b, the array substrate 21 and the opposing substrate 22 are aligned so as to overlap, and the first insulating substrate 23 and the second insulating substrate 31 are bonded. Next, the first insulating substrate 23 and the second insulating substrate 31 are respectively connected to the first to fourth cutting lines 21 a to 21 d and 22 of the array substrate 21 and the counter substrate 22.
Breaking is performed along a to 22d to form a liquid crystal cell having a predetermined outer shape. At this time, in the counter substrate 22, the BM 32 of the color filter 37 extends only up to the application region of the sealant 44, and the first to fourth cutting lines 22a to 22
At the time of the break at d, it is not cut.

Thereafter, the liquid crystal composition 29 is injected into the gap between the array substrate 21 and the counter substrate 22 surrounded by the sealant 44, and the polarizing plates 46 and 47 are adhered to complete the color LCD 18.

The color LCD 1 thus manufactured
When a display test was performed using Sample No. 8, no display defect due to disconnection or short circuit of the scanning line 24 or the signal line 26 was observed, and good display quality was obtained.

With this configuration, the color filter 3
7, the BM 32 extends only up to the region where the sealant 44 is applied. Even when the first and second insulating substrates 23 and 31 are broken at the time of forming the outer shape of the array substrate 21 and the counter substrate 22, the BM 32 Is not broken, the scanning lines 24 and the signal lines 26 on the array substrate 21 are not damaged or short-circuited due to burrs as in the conventional case, and the wiring is not adversely affected electrically, and high quality is achieved. Can be obtained, the occurrence of defects is smaller than in the past, and the production yield can be improved.

Further, in this embodiment, a sealant 44 is applied to a region sandwiched between the first and second gap holding columns 43a and 43b, and the array substrate 21 and the opposing substrate 22 are bonded together. , The end of the BM 32 extends to the region where the sealant 44 is applied, so that the gap between the two substrates 21 and 22 causes a step.
The thickness of the gap holding columns 43a and 43b is regulated to be constant, and thus the gap between the substrates 21 and 22 can be uniformly held, and good display quality can be obtained. Moreover, the gap holding columns 43a and 43b can be formed simultaneously with the formation of the color filter 37 using the same material as the material forming the color filter 37. In particular, it is necessary to newly perform a process for manufacturing the gap holding columns. There is no increase in manufacturing cost.

The present invention is not limited to the above-described embodiment, but can be modified without departing from the spirit of the invention. It may be formed of a different resin or the like, or may be provided on the array substrate side instead of the counter substrate. If the light-shielding film does not extend outside the sealant,
As in the first modification shown in FIG. 6, a color LCD 65 may be formed on the opposing substrate 60 such that the end of the color filter 62 is located inside the application region of the sealant 61. Further, as long as the gap between the LCDs can be held constant, the arrangement position of the gap holding columns is not limited.
As shown in a second modification shown in FIG. 1, first and second gap holding columns 66 and 67 are arranged on a counter substrate 64, and a sealant 68 is provided.
May be cut at the first to fourth contact sections 70 to 73 between the second gap holding pillar 67 and the sealing agent 68.

The thickness of the light-shielding film is not limited.
In the case of a thick light-shielding film having a thickness of 00 nm or more, the step becomes large between the region where the light-shielding film is present and the region where the light-shielding film is not present. The shape of the column for maintaining the gap is not limited to a circular column, but may be arbitrary such as being provided in a line along the sealant.

[0024]

As described above, according to the present invention, when the outer shape is formed into a desired shape by, for example, breaking a liquid crystal cell composed of an array substrate and a counter substrate of a color LCD, light is shielded by a cutting line of the counter substrate. No burrs on the film, no damage or short-circuit on the array substrate due to burrs, no defects due to adverse electrical effects, and high quality display images can be obtained. The yield can be improved.

Further, by disposing a sealant for fixing the array substrate and the opposing substrate in a region sandwiched between the gap holding columns formed on the opposing substrate, the end of the color filter layer extends to the application region of the sealant. Therefore, even if there is a step in the gap between the two substrates due to the presence or absence of the color filter layer in the application area, the sealant fixing portion can be regulated to a fixed thickness by the gap holding columns, and thus the array substrate and the counter substrate The gap between them can be kept uniform, and good display quality can be obtained without causing gap unevenness.

[Brief description of the drawings]

FIG. 1 is a partial schematic cross-sectional view of a color LCD according to an embodiment of the present invention.

2A and 2B show a color LCD according to an embodiment of the present invention, wherein FIG. 2A is a schematic plan view, and FIG.
It is a schematic sectional drawing in the -A 'line.

FIG. 3 is a schematic explanatory view showing a plurality of array substrate patterns formed on a first insulating substrate according to the embodiment of the present invention.

FIGS. 4A and 4B are schematic process diagrams showing a manufacturing process of the counter substrate according to the embodiment of the present invention, wherein FIG.
(B) shows the time when the red (R) color material is applied, (c) shows the time when the green (G) color material is applied, and (d) shows the blue (B).
(E) is a schematic explanatory view showing the time of forming the alignment film.

FIG. 5 is a schematic explanatory view showing a plurality of opposing substrate patterns formed on a second insulating substrate according to the embodiment of the present invention.

FIG. 6 is a partial schematic sectional view showing a first modification of the present invention.

FIG. 7 is a partial schematic sectional view showing a second modification of the present invention.

FIG. 8 is a partial schematic cross-sectional view showing a conventional color LCD.

FIG. 9 is a schematic plan view showing a conventional color LCD.

[Explanation of symbols]

 Reference Signs List 18 color LCD 21 array substrate 22 opposed substrate 23 first insulating substrate 24 scanning line 26 signal line 27 TFT 28 pixel electrode 29 liquid crystal composition 31 second insulating substrate 32 BM 33 .., 34, 35... Color material 37... Color filter 40... Counter electrode 43a... First gap holding pillar 43b. Mask 53 ... third mask

Claims (6)

[Claims] 1. An array substrate having pixel electrodes which are arranged in a matrix and driven by a thin film transistor to which signals are input from a scanning line and a signal line, and which has a counter electrode and has a predetermined gap from the array substrate And a liquid crystal composition enclosed in a region surrounded by the sealant, the sealant surrounding the gap around the display area where the pixel electrode is arranged, and the counter substrate. And a color filter layer made of a light-shielding film and a coloring material arranged so that an end does not extend outside the arrangement region of the sealant, and the array provided on both sides of the sealant so as to sandwich the sealant. A liquid crystal display device comprising: a substrate; and a gap holding column that holds the gap between the counter substrate and the counter substrate constant. 2. The liquid crystal display device according to claim 1, wherein the gap maintaining pillar is formed on the counter substrate using a material forming the counter substrate. 3. The liquid crystal display device according to claim 2, wherein the material forming the opposite substrate includes at least a part of the color filter layer. 4. The liquid crystal display device according to claim 1, wherein the gap maintaining columns provided on both sides of the sealing agent so as to sandwich the sealing agent have the same sectional structure in the layer direction. 5. The liquid crystal display device according to claim 1, wherein the thickness of the light shielding film is 500 nm or more. 6. An array substrate which is arranged in a matrix and has a pixel electrode driven by a thin film transistor to which signals are inputted from a scanning line and a signal line, and has an opposing electrode and is separated by a predetermined gap from the array substrate An opposing substrate, a sealing agent surrounding the gap around the pixel electrode, a liquid crystal composition sealed in a region surrounded by the sealing agent, and an end portion formed on the opposing substrate. A liquid crystal display device having a light-shielding film and a color filter layer made of a coloring material arranged so as not to extend outside the region where the sealant is arranged, wherein the scanning line and the signal are formed on a first insulating substrate. Forming the matrix-shaped pixel electrode driven by the thin-film transistor to which a signal is input from a line to form the array substrate; and forming a light-shielding film on a second insulating substrate. Forming the color filter layer and the light-shielding film made of a color material and the color filter layer made of a color material and the counter electrode to form the counter substrate; and forming the sealant on the array substrate and / or the counter substrate. Forming gap holding columns for keeping the gap between the array substrate and the counter substrate constant on both sides of the arrangement region; and forming the array so that the sealant is located between the gap holding columns. A step of applying to the substrate and / or the counter substrate; a step of bonding the array substrate and the counter substrate with the sealant with the gap therebetween; and a step of forming the array substrate and the counter substrate in a predetermined shape. A method for manufacturing a liquid crystal display device, comprising: