JPH09318959A - Liquid crystal display device and its bright point defect correcting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a correcting method which can comply with high definition of the liquid crystal display device as to a full-time light transmitting pixel defect correcting method which forming a light shield film of resin having a light shield material dispersed for pixels of the liquid crystal display device through which light is always transmitted. SOLUTION: When a full-time light transmitting pixel defect of the high- definition liquid crystal display device is corrected by this method, a liquid resin film 15 having a surface that becomes nearly parallel at the center part of an array substrate 2 is formed on the full-time light transmitting pixel defect, the circumference of the liquid resin film 15 is irradiated with laser light 16 of 100W in output and 1μm in wavelength to burn out the liquid resin film at the periphery, and a gate resin film 17 is formed at the periphery of the remaining liquid resin film and then cured. Consequently, while the light shield film 13 is made to correspond with conventional high-definition pixel electrodes and machined into an arbitrary shape independent of surface tension, the film is made more uniform than before.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device and a method for correcting bright spot defects in the liquid crystal display device.

2. Description of the Related Art Liquid crystal display devices have been attracting attention as the mainstay of next-generation displays, and especially in the field of high-definition video such as high-definition televisions and projectors.
An active matrix type liquid crystal display device using FT has been researched and developed as a favorite. In such an active matrix type liquid crystal display device, the electrode wiring width and the element size are made as small as possible, and the number of pixels per unit area is increased within a limited substrate size to achieve high definition. A typical polycrystalline silicon TF is shown in FIG.
The cross-sectional structure of a T-type liquid crystal display device is shown. As shown in FIG. 14, the liquid crystal display device includes a glass-made array substrate 2 and a filter substrate 3 which face each other with the liquid crystal 1 interposed therebetween.
Of the pair of glass substrates facing each other, the array substrate 2 has a large number of signal lines and scanning lines formed in a matrix on the glass substrate, and the pixel electrodes are formed at intersections of these signal lines and scanning lines. For charging and discharging the electric charge of
T4 (thin film transistor) is formed. Further, a pixel electrode 5 larger than the TFT is provided adjacent to the TFT 4. On the other hand, of the pair of glass substrates, the filter substrate 3 has the filter layer 6 and the BM formed thereon.
7 (black matrix) and the transparent conductive film 8 are formed. Further, an array alignment film 9 and a filter alignment film 10 are arranged on the liquid crystal side inside these two glass substrates so as to be in contact with the liquid crystal 1. In addition, the array polarization plate 11 and the filter polarization plate 12 are attached to the outside of the two glass substrates so that the polarization axes are orthogonal or parallel depending on the method. In the active matrix type liquid crystal display device having such a structure, the projection type 1 is formed on one substrate.
440 (horizontal pixel number) × 1024 (vertical pixel number) = about 148
It is necessary to form one million or more TFT elements like million pixels. Therefore, a defect is likely to occur in the manufacturing process, and when the TFT malfunctions or when the pixel electrode or the alignment film is not normally formed, it becomes impossible to block the transmitted light in the pixel. The part appears as a bright spot defect. In a liquid crystal display device employing a BM, just as the BM on the display screen is inconspicuous when attention is paid to the displayed screen, the extent to which the BM on the screen is perceived as a display defect by the human eyes is always light. Light transmission defects (bright spot defects) are much higher than non-transmission defects,
A realistic response was desired. Therefore, as a method of correcting the bright spot defect of such a liquid crystal display device, the gate electrode and the drain electrode of the TFT are circuit-connected using a laser beam and a DC voltage is always applied to the pixel electrode of the defective pixel. ,
There has been proposed a method of always making a light non-transmissive defect (Japanese Patent Laid-Open No. 5-210111). However, in this repair method, the DC voltage applied to the corresponding pixel electrode may cause the ions in the liquid crystal to concentrate in the repair portion, which may shorten the life of the liquid crystal display device. As a method of correcting the bright spot defect without applying a DC voltage to the pixel electrode in the defective portion, there is a method of shielding the defective pixel electrode region from light. 1) Light shielding by a metal film by laser CVD (JP-A-5-249487). Gazette), 2)
Light shielding by a resin in which a light shielding material is dispersed (Japanese Patent Laid-Open No. 4-32)
Japanese Patent No. 3617) has been proposed. Further, a method has also been proposed in which an alignment film of a liquid crystal display device is irradiated with a laser beam so that a light non-transmissive defect is constantly generated (Japanese Patent Laid-Open No. 60-243635).
(Japanese Patent Laid-Open No. 8-15660).

[Patent Document 1] Japanese Unexamined Patent Publication No. 5-24948
In the method described in Japanese Patent Publication No. 7, a metal film must be deposited so as to cover the entire pixel region with a film thickness required for light shielding, and the process time including evacuation is long, which causes a problem in throughput. There is. In addition, JP-A-60-2
In the method disclosed in Japanese Patent Laid-Open No. 43635 or JP-A-8-15660, for example, when fine particles such as a filler used for obtaining a gap between opposing glass substrates of a liquid crystal display device are present in the corrected pixel region, There is a problem that it can not be corrected well and causes symptoms such as light leakage. Further, the method described in Japanese Patent Laid-Open No. 4-323617 clears these problems, but since the light-shielding material dispersed in the resin is attached by transfer or printing, it has a size of 200 μm or more. However, in a high-definition pattern of 100 μm or less, the light-shielding film 13 adheres to two or more pixels as shown by the area within the ellipse in FIG. There was a problem that caused it. The present invention solves the above-mentioned problems and provides a liquid crystal display device that is compatible with high-definition patterns.

SUMMARY OF THE INVENTION A bright spot defect repairing method for a liquid crystal display device according to the present invention is a bright spot defect repairing method for a liquid crystal display device, wherein a constant light transmitting pixel defect of a liquid crystal display panel is a constant light nontransmitting pixel defect. In the liquid crystal display panel, a light-shielding film is provided on the constantly light-transmitting pixel defect of the liquid crystal display panel, and the light-shielding film is processed so as to shield only the pixel of the always-light-transmitting pixel defect. Further, the bright spot defect correcting method for a liquid crystal display device of the present invention is characterized in that the light shielding film is changed from a liquid state to a solid state. Furthermore, the bright spot defect correction method for a liquid crystal display device of the present invention is characterized in that the light-shielding film is changed from a gel state to a solid state. Then, the bright spot defect correcting method for a liquid crystal display device of the present invention is characterized in that the light shielding film is made of a resin in which a light shielding material is dispersed. In addition, the bright spot defect correcting method of the liquid crystal display device of the present invention is characterized in that the light shielding film is on the light transmitting side of the constant light transmitting pixel defect of the liquid crystal display panel. The bright spot defect correcting method for a liquid crystal display device of the present invention is characterized by processing by burning away the periphery of the light shielding film. Then, the bright spot defect repairing method of the liquid crystal display device of the present invention is characterized by processing by curing the center of the light shielding film. Alternatively, the bright spot defect correcting method for a liquid crystal display device of the present invention is characterized in that the light shielding film is processed by using a laser. In addition,
The liquid crystal display device of the present invention is a liquid crystal display device in which a constant light transmission pixel defect of a liquid crystal display panel is a constant light non-transmission pixel defect, and a light shielding material is dispersed on the light transmission side of the constant light transmission pixel defect of the liquid crystal display panel. A light-shielding film made of resin is located, and the light-shielding film has a shape including the TFT and the pixel. According to the configuration of the present invention, even in a high-definition defective pixel pattern, the light-shielding film does not cover the normal pixels, so that the correction can be performed without lowering the display quality, and the yield of the high-definition liquid crystal display panel can be improved. Can be improved. Further, since the light-shielding film is processed on the outside of the liquid crystal panel at room temperature and atmospheric pressure, the throughput is high, and even if fine particles such as fillers are present between the glass substrates, it is possible to make a good correction. Further, when the incident angle of light with respect to the panel is not constant within the panel as in a transmissive liquid crystal projector, the light blocking positions do not match on the panel surface, but in the method of the present invention, a light blocking film is provided on the light transmitting side for processing. Therefore, it is possible to select an arbitrary position to block light. By the way, the resin in which the light-shielding material is dispersed is close to a liquid state before curing and has a substantially constant volume on the glass substrate but does not have a fixed shape. Make an interface perpendicular to it. When observed with one light-shielding film, the surface of the central light-shielding film is more parallel to the substrate than the surface of the surrounding light-shielding film. Further, when the two light-shielding films having different areas are observed, the light-shielding film having a larger area is flatter than the light-shielding film having a smaller area with respect to the substrate. Such a phenomenon occurs because the surface tension γ acts between the substrate and the light shielding film. If the transfer pattern of the transfer plate is approximated by a square with one side a, γ = F /, where V is the volume of resin remaining on the glass substrate, ρ is the density of resin, g is the acceleration of gravity, and 4a is the circumference.
L = Vρg / 4a. As is clear from the above equation, in order to reduce the volume of the light shielding film according to the high definition of the liquid crystal display device under a constant surface tension, the length a of one side of the transfer plate is
Needs to be smaller. However, when the circumference of the light-shielding film transferred to the substrate becomes small to some extent, even if the length a of one side is reduced to several tens of μm, as shown in FIG. 16, the hanging drop 14 in the direction parallel to gravity becomes long. At the same time, the cross-sectional area of the hanging drop 14 in the direction perpendicular to gravity becomes larger than the area of the transfer plate,
The diameter of the liquid resin transferred to the glass substrate by transfer is about 200 μm. Therefore, according to the present invention, once a light-shielding film having a relatively large diameter which is adjusted depending on the surface tension of the light-shielding film and the weight of the light-shielding film is formed on a liquid crystal display device, then unnecessary portions are burnt out by laser light or only necessary portions are burnt out. Decided to heat cure. When a large light-shielding film is shaped into a small light-shielding film as described above, the cross-sectional shape of the light-shielding film after shaping does not become a semicircular shape, which is an equilibrium state when the area is small from the beginning, and a large size before shaping is used. It takes the form of a plateau using the flatness of the area and center. Therefore, the thickness of the remaining light shielding film becomes uniform, and the uniformity of light shielding increases. Also,
The planar shape of the light-shielding film after shaping is always processed into an arbitrary shape according to the pixel shape of the light-transmitting pixel defect. Therefore, the area and position of the remaining light-shielding film are most suitable for bright spot defect correction.

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional process diagram of a bright spot defect correction method for a liquid crystal display device. First, as shown in FIG. 1a, on the array substrate 2 at the light transmitting position above the bright spot defect of the liquid crystal display panel, a film having a film thickness of 20 μm in normal temperature and normal pressure air,
Carbon black, which is dispersed at 10 wt% in the epoxy resin and blocks light, is attached by screen printing to form an opaque liquid resin film 15 having a surface substantially parallel to the center of the substrate. Second, as shown in Figure 1b,
With the liquid resin film 15 as it is, a wavelength of 1 μm is always provided around the liquid resin film, which corresponds to the portion of the pixel adjacent to the light transmitting pixel defect.
Laser light from a YAG laser device of m, output of 100 W
Is irradiated. Then, as shown in FIG. 1c, the unnecessary liquid resin film is burned out, and at the same time, a portion adjacent to the burned-off liquid resin film is temporarily cured to become a gel resin film 17 which is not deformed.
Thirdly, as shown in FIG. 1d, the light-shielding film 13 is constantly formed on the array substrate 2 above the light-transmitting pixel defect by heat transfer heating in an atmosphere of 120 ° C. for 30 minutes or radiant heating by laser light. Form. FIG. 2 is a plan process diagram of the bright spot defect correcting method of the liquid crystal display device of the first embodiment. First,
As shown in FIG. 2a, the temperature of 20 ° C., the pressure of 1 atm, and the relative humidity of 60% are set at the positions of the constantly transparent pixel defects of the array substrate 2.
After printing the opaque resin with the light shielding material dispersed under the conditions of
The average radius is 200 μm when the circumference is circular due to surface tension.
The liquid resin film 15 is formed. Next, as shown in FIG. 2B, when the liquid resin film in the pixel portion adjacent to the light transmitting pixel defect is always irradiated with the laser light, the liquid resin film in that portion is heated to become the burned-out portion 18 and the light is transmitted. Come to do. At the same time, the liquid resin film adjacent to the burned-off portion 18 is temporarily hardened to become a hollow rectangular gel resin film 17. From FIG. 2b, the planar shape of the light-shielding film is not a circle dominated by surface tension,
It can be seen that it is processed into a rectangle independent of the surface tension. Further, since the periphery is gelled, even if the liquid resin film 15 remaining in the gel resin film 17 is heated to cure the liquid resin film 15 later, the plane boundary of the light shielding film does not change much. (Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a cross-sectional process diagram of the bright spot defect repairing method for the liquid crystal display device of the second embodiment. First, as shown in FIG. 3a, on the array substrate 2 at the light transmitting position above the bright point defect of the liquid crystal display panel, the light dispersed at 15 wt% in the epoxy resin having a film thickness of 15 μm at room temperature and normal pressure is blocked. Dye (dye name CI Black 22) is attached by transfer to form an opaque liquid resin film 15. Second, as shown in FIG. 3b, after the liquid resin film is once converted into the gel resin film 17 by heating, a wavelength of 1 μm is constantly provided around the gel resin film 17, which corresponds to a pixel portion adjacent to the light transmitting pixel defect. The laser light 16 is emitted from a YAG laser device having an output of 200 W. Then, as shown in FIG. 3c, the unnecessary gel resin film is burned out, and at the same time, the portion adjacent to the burned gel resin film is fully cured to become the light shielding film 13 which is not deformed. Thirdly, as shown in FIG. 3d, by heat transfer heating in an atmosphere of 120 ° C. for 30 minutes or radiant heating by a laser beam, the entire upper portion of the light transmitting pixel defect is converted into the light shielding film 13. The conversion of the liquid resin film into the gel resin film is performed by adjusting the elapsed time after preparation of the liquid resin film, the heating time or the heating temperature. FIG. 4 is a plan process diagram of a bright spot defect correcting method for a liquid crystal display device according to the second embodiment. First, as shown in FIG. 4A, an opaque resin in which a light-shielding material is dispersed at room temperature and normal pressure is transferred to a position of a constantly light-transmitting pixel defect on the array substrate 2, and then a liquid whose circumference is circular due to surface tension is transferred. The resin film 15 is formed. Next, as shown in FIG. 4B, after the liquid resin film is converted into a gel resin film by heating in advance, the laser light is constantly applied to the gel resin film of the pixel portion adjacent to the light transmitting pixel defect. The gel resin film is heated to become the burned-out portion 18 and light is transmitted therethrough. At the same time, the gel resin film adjacent to the burned-off portion 18 is fully cured to become the hollow rectangular light-shielding film 13. According to the present embodiment, since the periphery is fully cured, the light shielding film 1 will be
Even if the gel resin film 17 remaining inside 3 is heated to cure, the plane boundary of the light shielding film does not change. Further, according to the present embodiment, since the light-shielding film on the substrate is not necessarily shaped in a flat place because it is gelled, it is possible to set the angle at which the substrate can be shaped easily. (Third Embodiment) A third embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a sectional process view of a bright spot defect repairing method for a liquid crystal display device according to the third embodiment. First, as shown in FIG. 5a, on the array substrate 2 at the light transmitting position above the bright point defect of the liquid crystal display panel, the light dispersed at 20 wt% in the epoxy resin having a film thickness of 15 μm at room temperature and normal pressure is blocked. A dye (dye name CI Black 29) is attached by printing to form an opaque liquid resin film 15. Second, as shown in FIG. 5b, after the liquid resin film is first converted into the light-shielding film 13 by heating, the light-shielding film 13 is always surrounded by a wavelength of 1 μm, which corresponds to the pixel portion adjacent to the light-transmitting pixel defect.
Laser light from a YAG laser device of m, output of 400 W 16
Is irradiated. Then, as shown in FIG. 5c, the desired light-shielding film 13 is obtained by burning away the unnecessary light-shielding film.
According to this embodiment, a light-shielding film having a cross-sectional shape that is not affected by surface tension can be obtained with the least number of steps. FIG. 6 is a plan process diagram of a bright spot defect correcting method for a liquid crystal display device according to the third embodiment. First, as shown in FIG. 6a, an opaque resin in which a light-shielding material is dispersed at room temperature and normal pressure is printed at the position of the constantly light-transmitting pixel defect of the array substrate 2, and then a liquid whose circumference is circular due to surface tension is printed. The resin film 15 is formed. Next, as shown in FIG. 6b, after the liquid resin film is converted into an elliptical light-shielding film by heating in advance, the light-shielding film in the pixel portion adjacent to the light-transmitting pixel defect is always irradiated with laser light, and the portion is irradiated. The light-shielding film is heated to become the burned-off portion 18, and light is transmitted therethrough. The shaping device for burning out the light-shielding film in the pixel portion adjacent to the always-light-transmitting pixel defect described above will be described below. FIG. 7 is a perspective view of a shaping device used in the first, second and third embodiments. As shown in FIG. 7, the emitted light 19 of at least several 100 W emitted from the YAG laser device is deformed by the lens 20 so as to come close to the outer shape of the light-shielding film transferred onto the array substrate, and thereafter, the target light is obtained. When passing through the opening 23 of the mask 22 having the light-shielding portion 21, which is similar to the outer shape of the constantly light-transmitting pixel defect, the irradiation light 24 becomes the irradiation light 24 capable of burning out the light-shielding film of the pixel portion adjacent to the constantly light-transmitting pixel defect. As the mask, a development pattern of a negative type resist in which photopolymerization always proceeds by light from a light-transmitting pixel defect may be used in addition to an ordinary metal mask made of Cr. The embodiment so far is an embodiment in which an unnecessary light shielding film is shaped by a laser, but an embodiment in which a necessary light shielding film is subsequently cured by a laser will be described below. (Fourth Embodiment) A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a sectional process view of a bright spot defect repairing method for a liquid crystal display device according to the fourth embodiment. First, as shown in FIG. 8A, the liquid crystal display panel is placed on the array substrate 2 at the light transmitting position above the bright spot defect in the air at room temperature and normal pressure.
Insulating inorganic pigments Y (yellow) and C, which have a thickness of μm and are dispersed in an epoxy resin at 20 wt% to block light.
A mixture of (cyan) and M (magenta) colors is applied by printing to form an opaque liquid resin film 15. Second, as shown in FIG. 8b, the liquid resin film 15 above the bright spot defect is irradiated with laser light 16 from a YAG laser device having a wavelength of 1 μm and an output of 10 W. Then, as shown in FIG. 8C, the gel resin film 17 gelled by the laser light is formed on the array substrate 2 above the bright point defect. Further, the portion adjacent to the gel resin film remains in the liquid state. Thirdly, as shown in FIG. 8d, after preliminarily immersing in an organic solvent at 50 to 60 ° C. for 15 minutes or more for degreasing,
Rinse twice with water, 5 to 3 in 60% sulfuric acid at 60 ° C.
When the liquid resin film is etched for 0 minutes and then fully cured, the light-shielding film 13 having excellent thickness uniformity is formed on the array substrate 2.
Formed on top. According to this embodiment, bright spots can be covered with low energy. FIG. 9 is a plan process diagram of a bright spot defect correcting method for a liquid crystal display device according to the fourth embodiment. First, as shown in FIG. 9A, an opaque resin in which a light-shielding material is dispersed at room temperature and normal pressure is printed at a position of a constantly light-transmitting pixel defect of the array substrate 2, and then a liquid having a circular circumference due to surface tension is printed. Resin film 1
5 is formed. Next, as shown in FIG. 9B, when the light-shielding film in the portion of the light-transmitting pixel defect is constantly irradiated with laser light, the light-shielding film in that portion is cured to become the light-shielding film 13. The unnecessary liquid resin film or gel resin film around the rectangular light-shielding film is
It is removed by the etching conditions to become the melting portion 25,
Conventionally, a portion which has spread due to surface tension and which does not transmit light although the pixel is normally displayed, transmits light. (Fifth Embodiment) A fifth embodiment of the present invention will be described with reference to FIG. FIG. 10 is a sectional process view of a bright spot defect repairing method for a liquid crystal display device according to the fifth embodiment. First in Figure 10
As shown in a, on the array substrate 2 at the light transmitting position above the luminescent spot defect of the liquid crystal display panel, the insulating property of blocking the light dispersed at 20 wt% in the epoxy resin having a film thickness of 30 μm at room temperature and normal pressure. The organic pigment (pigment name CI 50440) is attached by transfer to form an opaque liquid resin film 15.
Second, as shown in FIG. 10b, a wavelength of 1 μm and an output of 2 μm are applied to the gel resin film 17 above the bright spot defect that has been uniformly heated in advance.
Laser light 16 is emitted from a 0 W YAG laser device.
Then, as shown in FIG. 10c, the light shielding film 13 solidified by the laser beam is formed on the array substrate 2 above the bright point defect. Further, the portion adjacent to the light shielding film remains in the gel state as before. Thirdly, as shown in FIG. 10d, for degreasing, it is preliminarily immersed in an organic solvent at 50 to 60 ° C. for 15 minutes or more in advance, then washed twice with water, and the temperature is 60 ° C.
When the gel resin film is etched in 60% by volume of sulfuric acid for 5 to 30 minutes, the plate-shaped light-shielding film 13 becomes the array substrate 2.
Formed on top. According to this embodiment, since the periphery is in a gel state, the shape of the heat-cured light shielding film is likely to be rectangular. The shaping device that cures the light-shielding film at the portion of the always-light-transmitting pixel defect described above will be described below. FIG. 11 is a perspective view of a shaping device used in the fourth and fifth embodiments. As shown in FIG. 11, at least several tens of watts of emitted light 19 emitted from the YAG laser device is emitted.
Is deformed by the lens 20 so as to come close to the outer shape of the light-shielding film transferred onto the array substrate, and then passes through the opening 23 of the mask 22, which is similar to the outer shape of the target light-transmissive pixel defect, Irradiation light 24 is always available to cure the light-shielding film in the portion of the light-transmitting pixel defect. As the lens used in FIG. 11, a lens that narrows the width of light such as a cylindrical lens is used. As the mask, in addition to a normal metal mask made of Cr, a development pattern of a positive type resist in which photolysis is always promoted by light from a light transmitting pixel defect may be used.
Moreover, the shape of the mask is not limited to the shape similar to the pixel,
It may be a rectangle including the area of the TFT. In this way, the light-shielding film made of resin in which the light-shielding material is dispersed is positioned on the light-transmitting side of the constant light-transmitting pixel defect of the liquid crystal display panel,
Moreover, if the shape of the light-shielding film is a quadrangle including the TFT and the pixel, it is usually the easiest to fill the plane of the display screen, which is usually a rectangle, with the light from the outside of the liquid crystal display panel. On the other hand, the TFT is shielded from light, and the sharpness of the liquid crystal display panel is improved. Next, the position of the light-shielding film thus manufactured on the liquid crystal display panel will be shown by a sectional view. FIG. 12 is a cross-sectional view of a liquid crystal display panel formed by the bright spot defect correcting method for a liquid crystal display device of the present invention. As shown in FIG. 12, the light shielding film 13 is formed on the array substrate 2 made of glass, and the surface is covered with the array polarizing film 11 made of cellulose triacetate. Further, a polycrystalline silicon film formed at 500 ° C. is deposited on the inner surface side of the array substrate. Further, the surface of the polycrystalline silicon film is almost covered with an oxide film, and a transparent ITO pixel electrode 5 extending from a part of the opening to the pixel is formed.
And electrically connected to the source connected to the signal line. On the other hand, the boundary of the light shielding film 13 on the array substrate 2 is formed so as to overlap with the BM 7 side on the filter substrate 3, as compared with the boundary of the filter layer 6 that transmits light on the filter substrate 3. The reason for doing this is that the liquid crystal 1 between the two substrates is easier to move than the solid and the degree of scattering is larger than that of the solid, and the incident light is usually non-parallel light. Further, the light transmitted through the liquid crystal display panel first passes through the filter substrate and then through the array substrate having the light shielding film arranged at a specific position. With this configuration, with respect to light from the inside of the liquid crystal display panel,
Not only is the on-off ratio of the TFT improved by limiting the amount of light incident on the TFT, but it is also possible to reliably block light according to the position of the light transmitted through the array substrate. Therefore, FIG. 13 shows the position of the light-shielding film manufactured by the present invention in plan view with respect to the pixels. FIG. 13 is a plan view of a liquid crystal display device manufactured by the bright spot defect correcting method of the present invention. As shown in FIG. 13, white pixels are arranged so as to be scattered between the BMs 7 that shield light with metal Cr or the like. As shown in FIG. 13, the light-shielding film 13 made of resin in which the light-shielding material is dispersed is formed in a square shape in a shape substantially similar to the pixel represented by the left diagonal line. The ellipse shown by the dotted line including the light-shielding film 13 is the region of the light-shielding film when it is repaired by the conventional bright spot defect repairing method. FIG.
As can be seen from FIG. 3, according to the bright spot defect correction method of the present invention, only defective pixels are reliably shielded from light. Although the above embodiments have described the dye or pigment that absorbs a specific wavelength as the light shielding material, a metal material such as Ti that reflects visible light may be used. The light-shielding film having a thickness of several tens of μm has a black pigment, Ti having a particle size of about 10 μm, and a particle size of 0.1 μm.
More preferably, graphite of m is dispersed in an epoxy resin in a weight ratio of 3: 3: 1. Although not shown, it is possible to adopt a configuration in which each TFT on the screen and an abnormal pixel are covered. The light-shielding film need not be provided on the substrate, and may be provided on the polarizing plate in some cases. Furthermore, gelling or main curing may be adjusted not only by heat but also by time. As described above, in the bright spot defect repairing method for a liquid crystal display device of the present invention, since the light-shielding film is provided outside the liquid crystal panel under normal temperature and normal pressure, it is easy to repair the liquid crystal panel after fabrication, and moreover, the liquid crystal panel is transparent. It is also easy to adjust the degree of scattering of incoming light.
Since the shape of the dome-shaped light-shielding film is excluded, not only the thickness uniformity of the light-shielding film is improved, but also the processing accuracy of the light-shielding film is up to about 10 times the wavelength used for processing. High definition.

As described above, according to the bright spot defect repairing method for a liquid crystal display device of the present invention, it is possible to achieve high throughput without deteriorating the display quality even in a fine pixel electrode structure of 100 μm or less. Provided is a bright spot defect repairing method capable of repairing a bright spot defect of a liquid crystal display device at room temperature and normal pressure and capable of excellent repair without light leakage even when fine particles such as filler are present between glass substrates. it can. Moreover, since the liquid-state light-shielding film having a flat surface is processed, the thickness of the light-shielding film can be made uniform with relatively low energy. In addition, since the gel-shaped light-shielding film having no surface flow is processed, thermal deformation is less likely to occur, and the similarity between the light-shielding film and the pixel is enhanced, so that light can be reliably shielded. In addition, since the light-shielding film contains the resin, the light-shielding film is likely to be in a liquid state, and an interface parallel to the underlying substrate of the light-shielding film is easily formed. Further, since the light shielding film is arranged on the light transmitting side, it is easy to match the area and position of the light leaking from the bright spot. Further, since the thin surroundings are burnt out, the light-shielding film can be processed more quickly and with high precision. Further, since the central portion having excellent flatness is hardened, the light-shielding film can be processed to be flat and highly precise. Further, since the light-shielding film is processed by the laser, it can be processed in air at room temperature and normal pressure, and the throughput can be increased. In addition, in the liquid crystal display device of the present invention, a light-shielding film made of a resin in which a light-shielding material is dispersed is located on the light-transmitting side of a constant light-transmitting pixel defect of a liquid crystal display panel, and the shape of the light-shielding film is TFT. Since it has a shape including pixels, it has excellent planar filling properties of a high-definition rectangular display screen, and can reduce the photocurrent by shielding the TFT to improve the sharpness of the liquid crystal display device. Therefore, the present invention plays an extremely important role in liquid crystal display devices in the field of high-definition video such as high-vision projectors and displays for personal computers, regardless of whether they are projection type or direct-view type.

[Brief description of drawings]

FIG. 1 is a cross-sectional process diagram of a bright spot defect repairing method for burning away a liquid resin film of the present invention.

FIG. 2 is a plan process diagram of a bright spot defect correcting method for burning away a liquid resin film of the present invention.

FIG. 3 is a cross-sectional process diagram of a bright spot defect repairing method for burning away a gel resin film of the present invention.

FIG. 4 is a plan process diagram of a bright spot defect correcting method for burning away a gel resin film of the present invention.

FIG. 5 is a cross-sectional process diagram of a bright spot defect correcting method for burning away a solid resin film of the present invention.

FIG. 6 is a plan process diagram of a bright spot defect correcting method for burning away a solid resin film of the present invention.

FIG. 7 is a perspective view of a laser shaping device for burning away a resin film of the present invention.

FIG. 8 is a sectional process drawing of a bright spot defect correcting method for curing a liquid resin film of the present invention.

FIG. 9 is a plan process diagram of a bright spot defect correcting method for curing a liquid resin film of the present invention.

FIG. 10 is a sectional process drawing of a bright spot defect repairing method for curing a gel resin film of the present invention.

FIG. 11 is a perspective view of a laser shaping device for curing the resin film of the present invention.

FIG. 12 is a sectional view of a liquid crystal display device having a laser-processed light-shielding film of the present invention.

FIG. 13 is a plan view of a liquid crystal display device having a laser-processed light-shielding film of the present invention.

FIG. 14 is a cross-sectional view of a liquid crystal display device having a conventional unprocessed light-shielding film.

FIG. 15 is a plan view of a liquid crystal display device having a conventional unprocessed light-shielding film.

FIG. 16 is a cross-sectional view of a liquid resin film hanging from a conventional transfer plate.

[Explanation of symbols]

 1 Liquid Crystal 2 Array Substrate 3 Filter Substrate 4 TFT 5 Pixel Electrode 6 Filter Layer 7 BM 8 Transparent Conductive Film 9 Array Alignment Film 10 Filter Alignment Film 11 Array Polarizer 12 Filter Polarizer 13 Light-Shielding Film 14 Suspended Drop 15 Liquid Resin Film 16 Laser Light 17 Gel resin film 18 Burned-out part 19 Emitted light 20 Lens 21 Light-shielding part 22 Mask 23 Opening 24 Irradiation light 25 Melting part

Claims (9)

[Claims] 1. A bright spot defect correction method for a liquid crystal display device, wherein a constant light transmitting pixel defect of a liquid crystal display panel is a constant light non-transmitting pixel defect, wherein a light shielding film is provided on the constant light transmitting pixel defect of the liquid crystal display panel. A method for correcting a bright spot defect of a liquid crystal display device, characterized in that the light shielding film is processed into a shape that shields only the pixels having the always light transmitting pixel defect. 2. The method of repairing a bright spot defect in a liquid crystal display device according to claim 1, wherein the light-shielding film is changed from a liquid state to a solid state. 3. The bright spot defect correction method for a liquid crystal display device according to claim 1, wherein the light-shielding film is changed from a gel state to a solid state. 4. The method of repairing a bright spot defect in a liquid crystal display device according to claim 1, wherein the light shielding film is made of a resin in which a light shielding material is dispersed. 5. The method of repairing a bright spot defect in a liquid crystal display device according to claim 1, wherein the light shielding film is on the light transmitting side of the constant light transmitting pixel defect of the liquid crystal display panel. 6. The method of repairing a bright spot defect in a liquid crystal display device according to claim 1, wherein the light shielding film is processed by burning out the periphery thereof. 7. The method of repairing a bright spot defect of a liquid crystal display device according to claim 1, wherein the light shielding film is processed by hardening the center thereof. 8. The method of repairing a bright spot defect in a liquid crystal display device according to claim 1, wherein the light shielding film is processed by using a laser. 9. A liquid crystal display device in which a constant light transmission pixel defect of a liquid crystal display panel is a constant light non-transmission pixel defect, and a resin in which a light shielding material is dispersed on the light transmission side of the constant light transmission pixel defect of the liquid crystal display panel. A liquid crystal display device characterized in that a light-shielding film made of is positioned and the light-shielding film has a shape including TFTs and pixels.