JP4414061B2 - Liquid crystal display device and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device and a manufacturing method thereof, and more particularly to a structure in the vicinity of a sealing material for bonding a display driving substrate and a counter substrate.
[0002]
[Prior art]
Liquid crystal display devices are widely used as display devices for wristwatches, calculators, and the like because they have features such as thinness, light weight, and low power consumption. In particular, liquid crystal display devices that are driven by TFTs (thin film transistors) or the like are being replaced by CRTs that are display devices such as word processors and personal computers, and accordingly, further improvement in display characteristics is required.
[0003]
A conventional method for 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 driving 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 a colored layer for performing color display on the transparent insulating substrate. 3 is a display area in which an image is displayed, 4 is a peripheral area which is an outer edge of the board, and 5 is a mounting terminal section for performing display driving. Reference numeral 6 denotes a sealing material which is formed on the outer edge of one of the display driving substrate 1 and the counter substrate 2, that is, the peripheral region 4, adheres both substrates and determines the injection region of the liquid crystal 7, and 8 has a constant substrate interval. A spacer 9 mixed in the sealing material 6 for holding the liquid crystal 7 is a spacer disposed in the injection region of the liquid crystal 7 for the same purpose as the spacer 8.
First, the display drive substrate 1 and the counter substrate 2 are prepared, and an alignment film (not shown) is formed on the surface of each substrate. Next, bead-like spacers 9 for keeping the substrate interval constant are dispersed on either one of these substrates. Furthermore, the sealing material 6 is applied to the outer edge of one of these substrates. At this time, it is necessary to mix the spacers 8 in the sealing material 6 in order to obtain a uniform substrate interval.
Next, the display driving substrate 1 and the counter substrate 2 are overlapped so that the pixels coincide with each other, and the sealing material 6 is cured and the both substrates are bonded to each other while applying substantially uniform pressure to the entire surface of the substrate. Thereafter, the substrate is cut into a predetermined size, the liquid crystal 7 is sealed, and a liquid crystal display device is obtained through a predetermined process.
[0004]
[Problems to be solved by the invention]
In the conventional method for manufacturing a liquid crystal display device as described above, when the sealing material 6 protrudes into the display region 3 or is too close to the display region 3, the liquid crystal 7 is contaminated and good display durability is obtained. Therefore, when two substrates are bonded, the width of the sealing material 6 varies due to the spread in the surface direction of the sealing material 6 due to pressure, the application accuracy of the sealing material 6 and the variation in the coating amount of the sealing material 6. It was necessary to consider. Therefore, it is necessary to provide the peripheral castle 4 where the sealing material 6 is formed sufficiently wide, and it is difficult to narrow the frame of the liquid crystal display device.
As means for solving the above problems, for example, in Japanese Patent Application Laid-Open No. 11-237621, a linear wall portion is formed between the sealing material and the display area, thereby preventing the sealing material from protruding into the display area. A structure has been proposed. However, since the wall portion is formed continuously in this structure, bubbles are confined 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 defective liquid crystal injection occurs. There is a fear.
Further, the conventional sealing material 6 is mixed with the spacer 8 for keeping the substrate interval constant, but there is a problem that bubbles may be entrained during the mixing and the sealing material 6 is disconnected. .
[0005]
The present invention has been made in order to solve the above-described problems, and prevents liquid from sticking out to the display area of the sealing material and disconnection due to bubbles, has excellent display characteristics, and can achieve a narrow frame and a high yield. An object is to obtain a display device and a manufacturing method thereof.
[0006]
[Means for Solving the Problems]
A liquid crystal display device according to the present invention is formed on a display drive substrate and a counter substrate that are arranged to face each other and sandwich a liquid crystal, and on an outer edge portion of one of the display drive substrate and the counter substrate, and adheres both substrates together. A sealing material for determining an injection region of liquid crystal, and a projection pattern formed adjacent to the sealing material on the inner side of one or both of the display driving substrate and the counter substrate, and the projection pattern includes at least A plurality of projection patterns are continuously formed at a predetermined interval along the entire pattern of the sealing material except for the liquid crystal injection portion where the pattern of the sealing material is formed perpendicular to both substrate edges. When arranged substantially in parallel and the interval between the protrusion patterns is Y1,
10 μm ≦ Y1 ≦ 1000 μm.
[0007]
In addition, a display drive substrate and a counter substrate which are arranged to face each other and sandwich the liquid crystal, and are formed on either one of the outer edges of the display drive substrate and the counter substrate, and both substrates are bonded and a liquid crystal injection region is determined. A sealing material, a first protrusion pattern formed adjacent to the sealing material on the inner side of one or both of the display driving substrate and the counter substrate, and one of the display driving substrate and the counter substrate Alternatively, a second protrusion pattern formed adjacent to the seal material is provided outside both the seal materials, and the first protrusion pattern and the second protrusion pattern have at least the seal material patterns at the ends of both substrates. along the entire pattern of the sealing material except for the liquid crystal injection part are vertically formed to each the plurality of protrusion pattern is continuously at predetermined intervals, and the sealing material Are arranged substantially parallel, when the interval of the first protrusion patterns Y1, and the interval of the second protrusion patterns and Y2,
10μm ≦ Y1 ≦ 1000μm, it is an 10μm ≦ Y2 ≦ 1000μm.
When 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,
Y1 <Y2, and Y1 / (X1 + Y1) <Y2 / (X2 + Y2)
It satisfies the relationship.
The first protrusion pattern and the second protrusion pattern are made of a photosensitive resin.
[0008]
In the liquid crystal display device manufacturing method according to the present invention, a plurality of protrusion patterns are continuously arranged at predetermined intervals on either or both of the display drive substrate and the counter substrate. 10 μm ≦ Y1 ≦ 1000 μm, 10 μm ≦ Y2 ≦ 1000 μm where the protrusion pattern and the second protrusion pattern are parallel to each other, the interval between the first protrusion patterns is Y1, and the interval between the second protrusion patterns is Y2. Prepare a sealing material that does not include spacers to maintain the substrate spacing, and at least the sealing material except for the liquid crystal injection portion where the sealing material pattern is formed perpendicular to both substrate edges. All patterns, so as to form at a position sandwiched between the first protrusion patterns and second protrusion patterns, sealant display drive substrate and the counter substrate A step of applying the deviation or the other, superimposed display drive substrate and the counter substrate, and curing the sealant to adhere the two substrates, is obtained by such producing includes the step of sealing a liquid crystal between substrates .
[ 0009 ]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a partial plan view and a partial cross-sectional view showing a liquid crystal display device according to Embodiment 1 of the present invention. Further, the structure of the liquid crystal display device similar to the conventional one will be described with reference to FIG.
In FIG. 3, reference numeral 1 is a display driving 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 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 the outer edge of the substrate. In FIGS. 1 and 2, reference numeral 6 denotes a sealing material that is formed on the outer edge of one of the display drive substrate 1 and the counter substrate 2, that is, the peripheral region 4, and bonds both substrates and determines the injection region of the liquid crystal 7 Thus, the spacer for holding the substrate interval is not included. Further, 10a is a first protrusion pattern formed adjacent to the seal material 6 on the inner side of one or both of the display drive substrate 1 and the counter substrate 2, and 10b is the display drive substrate 1 and A second protrusion pattern formed adjacent to the sealing material 6 on the outer side of one or both sealing materials 6 of the counter substrate 2, and 11 a black matrix formed in the peripheral region 4 of the counter substrate 2, Reference numeral 12 denotes a colored layer formed on the counter substrate 2. Although not shown, ITO, a transparent organic insulating film, or the like may be formed on the counter substrate 2.
The liquid crystal display device according to the present embodiment seals the first protrusion pattern 10a on the inner side and the second protrusion pattern 10b on the outer side of either or both of the display drive substrate 1 and the counter substrate 2, respectively. It is characterized by being formed adjacent to the material 6. In addition, the first protrusion pattern 10 a and the second protrusion pattern 10 b have a plurality of protrusion patterns arranged continuously at a predetermined interval and substantially parallel to the sealing material 6.
[ 0010 ]
A method for manufacturing the liquid crystal display device in this embodiment will be briefly described. First, a first protrusion pattern 10a and a second protrusion pattern 10b in which a plurality of protrusion patterns are continuously arranged at predetermined intervals on the outer edge portion of the counter substrate 2 on which the counter electrodes and the color filters are formed. Are formed parallel to each other. The first and second protrusion patterns 10a and 10b are formed by applying a photosensitive resin on the counter substrate 2 and patterning by a photolithography method. Next, an alignment film (not shown) is formed on the surfaces of the display drive substrate 1 and the counter substrate 2, and a rubbing process is performed in a predetermined direction. Subsequently, bead-shaped spacers (not shown) having a diameter of 4.5 μm for keeping the substrate interval constant are dispersed on either one of these substrates.
Next, a sealing material 6 that does not include a spacer for holding the substrate interval is prepared, and the sealing material 6 is positioned between the first protrusion pattern 10a and the second protrusion pattern 10b of the counter substrate 2. Apply to.
Next, the display driving substrate 1 and the counter substrate 2 are overlapped so that the pixels coincide with each other, and the sealing material 6 is cured and the both substrates are bonded to each other while applying substantially uniform pressure to the entire surface of the substrate. Thereafter, the substrate is cut 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.
[ 0011 ]
The first protrusion pattern 10a and the second protrusion pattern 10b have the length of the first protrusion pattern 10a as X1, the interval as Y1, the length of the second protrusion pattern 10b as X2, and the interval as Y2. When
Y1 / (X1 + Y1) <Y2 / (X2 + Y2)
Satisfy the relationship
10 μm ≦ Y1 ≦ 1000 μm,
10 μm ≦ Y2 ≦ 1000 μm
It is desirable to be in the range. In this embodiment, X1 = 90 μm, Y1 = 10 μm, X2 = 400 μm, and Y2 = 100 μm.
This is because the interval Y2 of the second protrusion pattern 10b is made larger than the interval Y1 of the first protrusion pattern 10a, so that the protrusion to the display area 3 side is caused when the application amount of the sealing material 6 is excessive. It is to suppress. In addition, when Y1 and Y2 are 10 μm or less, the bubbles sandwiched between the sealing material 6 and the first and second protrusion patterns 10a and 10b may not be removed well, and the sealing pattern may be disconnected, resulting in poor liquid crystal injection. In the case of 1000 μm or more, there is a possibility that the sealing material 6 may protrude from the gap between the protrusion patterns.
Further, since it is desirable that the peripheral region 4 is narrow in order to reduce the size of the liquid crystal display device, the pattern width is suitably 1 mm or less, and is set to 20 μm in this embodiment. Further, the height of the pattern is determined from the substrate interval of the liquid crystal display device, and is set to about 6.7 μm in this embodiment.
[0012]
As described above, according to the present embodiment, by providing the first projection pattern 10a, it has conventionally occurred due to the spread in the surface direction due to the pressurization of the sealing material 6 and the variation in coating accuracy and coating amount. In addition, it is possible to prevent the sealing material 6 from protruding into the display area 3 and to prevent the outflow of contaminants from the sealing material 6 to the liquid crystal 7, so that a liquid crystal display device with good display characteristics and high yield can be obtained. Obtainable. Further, by providing the second protrusion pattern 10b, the yield is improved without the sealing material 6 protruding to the cutting position when the panel is cut. Further, since the first and second protrusion patterns 10a and 10b are continuously arranged at a predetermined interval, air bubbles between the sealing material 6 and the protrusion pattern can be escaped, and during the thermocompression bonding Since the disconnection of the sealing material 6 due to the expansion of the bubbles does not occur, defects such as poor liquid crystal injection and lower panel strength do not occur. In addition, since the spread of the sealing material 6 can be suppressed by the first and second protrusion patterns 10a and 10b, it is not necessary to provide the peripheral castle 4 widely as in the prior art, and the liquid crystal display device has a narrow frame. Figured.
Further, by making the heights of the first and second protrusion patterns 10a and 10b equal to the substrate interval, the spacers previously mixed in the sealing material 6 become unnecessary, so that the cost can be reduced and the seal is further increased. Since the step of mixing the spacer with the material 6 can be omitted, the yield is also improved.
[ 0013 ]
In the present embodiment, the first protrusion pattern 10a and the second protrusion pattern 10b are formed on the counter substrate 2. However, they may be formed on the display drive substrate 1 or when they are overlaid. You may form in both the opposing board | substrate 2 and the display drive board | substrate 1 so that it may oppose. Further, the counter substrate 2 and other portions may be formed on the display drive substrate 1 at certain locations. Further, in the present embodiment, the first and second protrusion patterns 10a and 10b are formed on both sides of the entire pattern of the sealing material 6. However, the liquid crystal injection portion (where the seal pattern is formed perpendicular to the substrate edge) With respect to the portion B in FIG. 1, it is not always necessary to form a protrusion pattern on both sides of the sealing material 6. Further, the sealing material 6 may be formed on either the display driving substrate 1 or the counter substrate 2.
[ 0014 ]
【The invention's effect】
As described above, according to the present invention, a plurality of protrusion patterns are continuously arranged at a predetermined interval adjacent to the seal material on the inner side of one or both of the display drive substrate and the counter substrate. to, and substantially parallel-arranged collision force pattern the sealant (first protrusion pattern) provided, when the interval of the protrusion pattern was Y1, by a 10 [mu] m ≦ Y1 ≦ 1000 .mu.m, the display of the sealant The protrusion to the region can be suppressed, and the outflow of contaminants from the sealing material to the liquid crystal can be prevented. In addition, by providing a projection pattern (second projection pattern) adjacent to the seal material on the outside of one or both of the display drive substrate and the counter substrate, the seal material is cut when the panel is cut. Yield is improved without protruding. In addition, since these protrusion patterns have a plurality of protrusion patterns arranged continuously at a predetermined interval, bubbles between the sealing material and the protrusion pattern can be released, and liquid crystal injection due to disconnection of the sealing material Defects such as defects and panel strength degradation do not occur. Accordingly, a liquid crystal display device with favorable display characteristics and high yield can be obtained. Further, since the spread of the sealing material can be suppressed and it is not necessary to provide a wide peripheral region, the frame of the liquid crystal display device can be reduced.
[ 0015 ]
In addition, since the projection pattern plays a role of maintaining the gap between the substrates, a sealing material that does not include a spacer can be used, and a step of mixing the spacer with the sealing material can be omitted, so that 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 showing the liquid crystal display device according to the first embodiment of the present invention.
FIG. 3 is a top view showing a liquid crystal display device.
FIG. 4 is a cross-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 terminal, 6 Sealing material, 7 Liquid crystal, 8 Spacer, 9 Spacer,
10a first protrusion pattern, 10b second protrusion pattern,
11 Black matrix, 12 colored layer.

Claims (5)

A display driving substrate and a counter substrate which are arranged to face each other and sandwich the liquid crystal,
A sealant formed on the outer edge of one of the display drive substrate and the counter substrate, which bonds the two substrates and determines the liquid crystal injection region;
Provided with a projection pattern formed adjacent to the sealing material inside the sealing material of either or both of the display drive substrate and the counter substrate,
The protrusion pattern includes at least a predetermined interval along the entire pattern of the sealing material except for the liquid crystal injection portion where the sealing material pattern is formed perpendicular to both substrate edges. Are arranged continuously and substantially parallel to the sealing material, and the interval between the protrusion patterns is Y1,
10 μm ≦ Y1 ≦ 1000 μm
A liquid crystal display device characterized by the above. A display driving substrate and a counter substrate which are arranged to face each other and sandwich the liquid crystal,
A sealant formed on the outer edge of one of the display drive substrate and the counter substrate, which bonds the two substrates and determines the liquid crystal injection region;
A first projection pattern formed adjacent to the sealing material on the inner side of the sealing material of one or both of the display driving substrate and the counter substrate;
A second protrusion pattern formed adjacent to the sealing material outside the sealing material of either or both of the display driving substrate and the counter substrate;
The first projection pattern and the second projection pattern are at least along the entire pattern of the sealing material except for the liquid crystal injection portion in which the pattern of the sealing material is formed perpendicular to both substrate ends. Each of the plurality of protrusion patterns is continuously arranged at a predetermined interval and substantially parallel to the sealing material, the interval between the first protrusion patterns is Y1, and the interval between the second protrusion patterns is Y2. When
10 μm ≦ Y1 ≦ 1000 μm, 10 μm ≦ Y2 ≦ 1000 μm
A liquid crystal display device characterized by the above. When 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,
Y1 <Y2, and Y1 / (X1 + Y1) <Y2 / (X2 + Y2)
The liquid crystal display device according to claim 2, wherein the relationship is satisfied.   The liquid crystal display device according to claim 2, wherein the first protrusion pattern and the second protrusion pattern are made of a photosensitive resin. A first protrusion pattern and a second protrusion pattern in which a plurality of protrusion patterns are continuously arranged at predetermined intervals on the outer edge portion of either one or both of the display driving substrate and the counter substrate, in parallel with each other, And when the interval between the first protrusion patterns is Y1, and the interval between the second protrusion patterns is Y2,
Forming so that 10 μm ≦ Y1 ≦ 1000 μm, 10 μm ≦ Y2 ≦ 1000 μm,
A sealing material that does not include a spacer for maintaining a gap between the substrates is prepared, and at least all the patterns of the sealing material except for the liquid crystal injection portion in which the pattern of the sealing material is formed perpendicular to the ends of both substrates are as is formed at a position sandwiched between the first projection pattern and the second projection pattern, the step of applying the sealing material on one of the display driving substrate and the counter substrate,
A method of manufacturing a liquid crystal display device, comprising: a step of superimposing the display driving substrate and the counter substrate, curing the sealing material, bonding the substrates, and enclosing a liquid crystal between the substrates.

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