JP2001324720A - Liquid crystal display device and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a liquid crystal display device capable of preventing a sealant from being protruded to a display region and from being disconnected by air bubbles, excellent in display characteristics, capable of narrowing a picture frame and attaining a high yield. SOLUTION: The first projecting patterns 10a and the second projecting patterns 10b are respectively formed inside and outside the sealant 6 provided on either one or both of a display driving substrate 1 and a counter substrate 2. Each of the first and the second projecting patterns 10a, 10b is a plurality of projecting patterns continuously arranged at a specified internal, suppresses the spreading of the sealant 6 in the plane direction by pressurizing and its protrusion to the display region 3 due to variation in coating precision and a coated amount, and prevents a contaminant from flowing out into a liquid crystal 7 from the sealant 6. Since the air bubbled between the sealant 6 and the projecting patterns 10a, 10b are discharged, defective injection of the liquid crystal or lowering of panel strength due to disconnection of the sealant 6 do not occur and a liquid crystal display device with the excellent display characteristics and the narrow picture frame is obtained with a high yield.

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 and a method of manufacturing the same, and more particularly, to a structure near a seal member for bonding a display driving substrate and a counter substrate.

[0002]

2. Description of the Related Art Liquid crystal display devices are widely used as display devices for watches, calculators, etc. because of their features such as thinness, light weight, and low power consumption. In particular, a liquid crystal display device that performs active driving by a TFT (thin film transistor) or the like is being replaced by a CRT, which is a display device of a word processor, a personal computer, or the like. Accordingly, further improvement in display characteristics is required.

A conventional method of manufacturing a liquid crystal display device will be briefly described with reference to FIGS. FIG. 4 shows a cross section of a portion indicated by AA in FIG. In the figure, 1
Is a display drive substrate in which electrodes for driving TFTs and liquid crystals are formed on a transparent insulating substrate such as a glass substrate, and 2 is an opposing substrate on which a colored layer for performing color display is formed on the transparent insulating substrate. Reference numeral 3 denotes a display area where an image is displayed, 4 denotes a peripheral area which is an outer edge of the substrate, and 5 denotes a mounting terminal section for performing display driving. 6 is the display drive substrate 1
And a sealing material formed on one of the outer edges of the opposing substrate 2, that is, the peripheral region 4, for adhering the two substrates and determining an injection region of the liquid crystal 7, and a sealing material 8 for keeping the distance between the substrates constant. The spacer 9 mixed therein is a spacer arranged in the injection region of the liquid crystal 7 for the same purpose as the spacer 8. First, a display drive substrate 1 and a counter substrate 2 are prepared, and an alignment film (not shown) is formed on each substrate surface. Next, bead-shaped spacers 9 for keeping the distance between the substrates constant are sprayed on one of the substrates.
Further, a sealing material 6 is applied to one of the outer edges of these substrates. At this time, it is necessary to mix the spacer 8 in the sealing material 6 in order to obtain a uniform substrate spacing.
Next, the display drive substrate 1 and the opposing substrate 2 are overlapped so that the pixels coincide with each other, and the sealing material 6 is cured while applying a substantially uniform pressure to the entire surface of the substrate to bond the two substrates together. afterwards,
The liquid crystal display device is obtained by cutting the substrate into a predetermined size, enclosing the liquid crystal 7, and passing through a predetermined process.

[0004]

In the conventional method of manufacturing a liquid crystal display device as described above, in the case where the sealing material 6 protrudes into the display area 3 or approaches the display area 3 too much,
Since the liquid crystal 7 is contaminated and good display durability cannot be obtained, when the two substrates are bonded to each other, the sealing material 6 spreads in the surface direction due to pressure, and the application accuracy and sealing of the sealing material 6 are increased. It was necessary to take into account the variation in the width of the sealing material 6 due to the variation in the application amount of the material 6. Therefore, the sealing material 6
It is necessary to provide a sufficiently large surrounding territory 4 where
It has been difficult to narrow the frame of the liquid crystal display device. As means for solving the above problems, for example, Japanese Patent Laid-Open No. 11-237
Japanese Patent Application Laid-Open No. 621 proposes a structure in which a linear wall portion is formed between a sealing material and a display area to prevent the sealing material from protruding into the display area. However, in this structure, since the wall portion is formed continuously, bubbles are trapped between the sealing material and the wall portion, the bubbles expand at the time of thermocompression bonding, a hole is formed in the sealing material, and a liquid crystal injection failure occurs. There is fear. In addition, the conventional sealing material 6 is mixed with the spacer 8 for keeping the distance between the substrates constant. However, there is a problem that air bubbles may be involved during the mixing, and the sealing material 6 is disconnected. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to prevent the sealing material from protruding into a display area or disconnection due to bubbles, to have excellent display characteristics, to achieve a narrow frame and a high yield. It is an object of the present invention to obtain a possible liquid crystal display device and a method for manufacturing the same.

[0006]

According to the present invention, there is provided a liquid crystal display device having a display driving substrate and a counter substrate arranged to face each other and sandwiching a liquid crystal, and an outer edge of one of the display driving substrate and the counter substrate. A sealing material that is formed and adheres the two substrates and determines a liquid crystal injection region; and a sealing material that is formed adjacent to the sealing material inside the sealing material for one or both of the display driving substrate and the counter substrate. One projection pattern and a second projection pattern formed adjacent to the seal material outside the seal material of one or both of the display drive substrate and the counter substrate. In addition, the first projection pattern and the second projection pattern each include a plurality of projection patterns arranged continuously at predetermined intervals and substantially parallel to the sealing material.

The first projection pattern and the second projection pattern have a length of the first projection pattern of X1, an interval of Y1, an interval of the second projection pattern of X2, and an interval of Y2.
In this case, the relationship of Y1 / (X1 + Y1) <Y2 / (X2 + Y2) is satisfied. Further, the first projection pattern and the second projection pattern are as follows: when the interval between the first projection patterns is Y1 and the interval between the second projection patterns is Y2, 10 μm ≦ Y1 ≦ 1000 μm and 10 μm ≦ Y2 ≦ 1000 μm. Is what you do. Further, the first projection pattern and the second projection pattern are made of a photosensitive resin.

In the method of manufacturing a liquid crystal display device according to the present invention, a plurality of projection patterns are continuously arranged at predetermined intervals on one or both outer edges of the display driving substrate and the counter substrate. Forming the first projection pattern and the second projection pattern in parallel with each other, and preparing a sealing material that does not include a spacer for maintaining a substrate interval, and using the sealing material for any of the display driving substrate and the counter substrate. One of the steps, a step of coating at a position sandwiched between the first projection pattern and the second projection pattern, a display driving substrate and an opposing substrate are overlapped, the sealing material is cured, and the two substrates are adhered to each other. It is manufactured so as to include a step of sealing liquid crystal between them.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2
1 is a partial plan view and a partial cross-sectional view illustrating a liquid crystal display device according to Embodiment 1 of the present invention. The structure of a liquid crystal display device similar to the conventional one will be described with reference to FIG.
In FIG. 3, reference numeral 1 denotes a display drive substrate in which electrodes for driving TFTs and liquid crystals are formed on a transparent insulating substrate such as a glass substrate, and 2 denotes a colored layer for performing color display on the transparent insulating substrate. The counter substrate is formed, 3 is a display area where an image is displayed, and 4 is a peripheral area which is an outer edge of the substrate. In FIGS. 1 and 2, reference numeral 6 denotes a liquid crystal layer 7 which is formed on an outer edge portion of one of the display driving substrate 1 and the counter substrate 2, that is, in the peripheral region 4.
, Which does not include a spacer for maintaining the distance between the substrates. Furthermore, 10a
Is a first projection pattern formed inside the seal material 6 of one or both of the display drive substrate 1 and the opposing substrate 2 and adjacent to the seal material 6; A second projection pattern formed outside the sealing material 6 and adjacent to the sealing material 6, 11 is a black matrix formed in the peripheral region 4 of the opposing substrate 2, and 12 is an opposing It is a colored layer formed on the substrate 2. Although not shown, ITO or a transparent organic insulating film may be formed on the counter substrate 2 in some cases. In the liquid crystal display device according to the present embodiment, the first projection pattern 10a is sealed inside the sealing material 6 of one or both of the display driving substrate 1 and the counter substrate 2, and the second projection pattern 10b is sealed outside the sealing material. It is characterized in that it is formed adjacent to the material 6. In the first projection pattern 10a and the second projection pattern 10b, a plurality of projection patterns are arranged continuously at predetermined intervals and substantially parallel to the sealing material 6.

A method for manufacturing a liquid crystal display device according to the present embodiment will be briefly described. First, a first projection pattern 10a and a second projection pattern 10b in which a plurality of projection patterns are continuously arranged at predetermined intervals on the outer edge portion of the opposite substrate 2 on which the opposite electrode and the color filter are formed. Are formed parallel to each other. The formation of the first and second projection patterns 10a and 10b is performed by applying a photosensitive resin on the counter substrate 2 and patterning by photolithography. Next, an alignment film (not shown) is formed on the surfaces of the display drive substrate 1 and the counter substrate 2, and rubbing is performed in a predetermined direction. Subsequently, a bead-like spacer (not shown) having a diameter of 4.5 μm is sprayed on one of the substrates to keep the distance between the substrates constant. Next, a sealing material 6 that does not include a spacer for maintaining the substrate interval is prepared, and this sealing material 6 is applied to the first projection pattern 10a of the counter substrate 2.
And a position interposed between the second projection patterns 10b. Next, the display driving substrate 1 and the opposing substrate 2 are overlapped so that the pixels coincide with each other, and the sealing material 6 is cured while applying a substantially uniform pressure to the entire surface of the substrate to bond the two substrates together. Thereafter, the substrate is cut out into a predetermined size, the liquid crystal 7 is sealed between the substrates, and the liquid crystal display device according to the present embodiment is obtained through a predetermined process.

The first projection pattern 10a and the second projection pattern 10b correspond to the first projection pattern 10a.
X1, the interval Y1, the second protrusion pattern 10b
When the length is X2 and the interval is Y2, it is preferable that the following relationship is satisfied: Y1 / (X1 + Y1) <Y2 / (X2 + Y2), and 10 μm ≦ Y1 ≦ 1000 μm and 10 μm ≦ Y2 ≦ 1000 μm. In the present embodiment, X1
= 90 μm, Y1 = 10 μm, X2 = 400 μm, Y2
= 100 μm. This is the second projection pattern 10
b is defined as the distance Y1 between the first protrusion patterns 10a.
By setting it larger than this, when the applied amount of the sealing material 6 is too large, the protrusion to the display area 3 side is suppressed. When Y1 and Y2 are 10 μm or less,
Seal material 6 and first and second protrusion patterns 10a, 1
There is a possibility that air bubbles sandwiched between 0b may not escape well, and the seal pattern may be disconnected, resulting in defective liquid crystal injection.
In the above case, there is a possibility that the sealing material 6 protrudes from the gap between the projection patterns. Further, the pattern width is preferably 1 mm or less because the peripheral area 4 is desirably narrow in order to reduce the size of the liquid crystal display device.
It was set to 0 μm. Further, the height of the pattern is determined from the distance between the substrates of the liquid crystal display device, and is approximately 6.7 μm in the present embodiment.
m.

As described above, according to the present embodiment, by providing the first projection pattern 10a, the spread in the surface direction due to the pressurization of the sealing material 6 and the variation in the coating accuracy and the coating amount are caused by the conventional method. Since the protrusion of the sealing material 6 into the display area 3 which has occurred can be suppressed and the outflow of contaminants from the sealing material 6 to the liquid crystal 7 can be prevented, the liquid crystal having good display characteristics and good yield can be obtained. A display device can be obtained. Further, by providing the second projection pattern 10b, the yield is improved without the sealing material 6 protruding to the cutting position when the panel is cut. In addition, since the first and second projection patterns 10a and 10b are continuously arranged at a predetermined interval, air bubbles between the sealing material 6 and the projection pattern can be released, and the first and second projection patterns 10a and 10b can be heated and compressed. Since the breakage of the sealing material 6 due to the expansion of the bubbles does not occur, defects such as defective liquid crystal injection and reduced panel strength do not occur. In addition, the first and second projection patterns 10
Since the expansion of the sealing material 6 can be suppressed by the elements a and 10b, it is not necessary to provide the peripheral territory 4 widely as in the related art, and the frame of the liquid crystal display device can be narrowed. further,
By making the heights of the first and second projection patterns 10a and 10b equal to the substrate spacing, the spacers conventionally mixed in the sealing material 6 become unnecessary, so that the cost can be reduced and the sealing material 6 can be further reduced. Since the step of mixing spacers can be omitted, the yield is also improved.

In the present embodiment, the first projection pattern 10a and the second projection pattern 10b are formed on the counter substrate 2, but they may be formed on the display drive substrate 1, May be formed on both the opposing substrate 2 and the display driving substrate 1 so as to face each other. further,
A certain portion may be formed on the counter substrate 2 and other portions on the display drive substrate 1. In the present embodiment, the sealing material 6
The first and second projection patterns 1 on both sides of the entire pattern
Although 0a and 10b are formed, it is not always necessary to form projection patterns on both sides of the sealing material 6 with respect to the liquid crystal injection portion (the portion B in FIG. 1) in which the seal pattern is formed perpendicular to the substrate edge. . Further, the sealing material 6 may be formed on either the display driving substrate 1 or the opposing substrate 2.

[0014]

As described above, according to the present invention, the first projection pattern is provided inside the sealing material of one or both of the display driving substrate and the counter substrate, and the second projection pattern is provided outside the sealing material. The first and second projection patterns are formed adjacent to the sealing material and are continuously arranged at a predetermined interval to prevent the sealing material from protruding into the display area, and the liquid crystal from the sealing material is formed. Can prevent outflow of contaminants to the substrate and release air bubbles between the sealing material and the projection pattern, thereby causing defects such as defective liquid crystal injection and reduced panel strength due to disconnection of the sealing material. Thus, a liquid crystal display device with good display characteristics and high yield can be obtained. Further, since it is not necessary to provide a wide peripheral area, the frame of the liquid crystal display device can be narrowed.

Further, since the first projection pattern and the second projection pattern serve to maintain the distance between the substrates, a sealing material containing no spacer can be used, and the step of mixing the spacer with the sealing material can be omitted. In addition, the cost can be reduced and the yield can be improved.

[Brief description of the drawings]

FIG. 1 is a partial plan view showing a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view illustrating the liquid crystal display device according to the first embodiment of the present invention.

FIG. 3 is a top view illustrating a liquid crystal display device.

FIG. 4 is a sectional view showing a conventional liquid crystal display device.

[Explanation of symbols]

1 display drive substrate, 2 counter substrate, 3 display area, 4
Peripheral area, 5 mounting terminals, 6 sealing material, 7 liquid crystal,
8 spacer, 9 spacer, 10a first projection pattern, 10b second projection pattern, 11 black matrix, 12 colored layer.

Claims (6)

[Claims] 1. A display driving substrate and an opposing substrate which are arranged to oppose each other and sandwich liquid crystal, and are formed on an outer edge of any one of the display driving substrate and the opposing substrate. A seal member that determines an injection region of the first substrate, a first protrusion pattern formed adjacent to the seal member inside one or both of the display drive substrate and the counter substrate, and the display. A liquid crystal display device, comprising: a second projection pattern formed adjacent to the seal material on one or both of the drive substrate and the counter substrate, outside the seal material. 2. The first projection pattern and the second projection pattern are characterized in that a plurality of projection patterns are arranged continuously at predetermined intervals and substantially parallel to the seal material. The liquid crystal display device according to claim 1. 3. A first projection pattern and a second projection pattern, wherein the length of the first projection pattern is X1, the interval is Y1, the length of the second projection pattern is X2, and the interval is Y2. 3. The liquid crystal display device according to claim 2, wherein the following relationship is satisfied: Y1 / (X1 + Y1) <Y2 / (X2 + Y2). 4. The first projection pattern and the second projection pattern, when the interval between the first projection patterns is Y1 and the interval between the second projection patterns is Y2, 10 μm ≦ Y1 ≦ 1000 μm, 10 μm 4. The liquid crystal display device according to claim 2, wherein ≦ Y2 ≦ 1000 μm. 5. 5. The liquid crystal display device according to claim 1, wherein the first protrusion pattern and the second protrusion pattern are made of a photosensitive resin. 6. A first projection pattern and a second projection pattern in which a plurality of projection patterns are continuously arranged at predetermined intervals on an outer edge of one or both of a display driving substrate and a counter substrate. Forming a sealant that does not include a spacer for maintaining a substrate interval, and providing the sealant with one of the display drive substrate and the counter substrate, the first protrusion pattern and A step of coating at a position sandwiched between the second projection patterns, overlapping the display drive substrate and the counter substrate, curing the sealing material, bonding the two substrates, and enclosing a liquid crystal between the substrates A method for manufacturing a liquid crystal display device, comprising the steps of: