JPH08146370A - Method for correcting defect of liquid crystal display device - Google Patents

Abstract

PURPOSE: To make it possible to obscure the defective picture elements existing in a liquid crystal display panel and eventually to prevent the degradation in display grade after defect correction by perpendicularly orienting the liquid crystal molecules of a liquid crystal layer. CONSTITUTION: Oriented films 14, 14 are respectively formed on the side of the surfaces of an active matrix substrate 12 and counter substrate 16 in contact with the liquid crystal layer. These oriented films 14, 14 are so formed as to orient the liquid crystal molecules of the liquid crystal layer by twisting these molecules nearly 90 deg.. Respective polarizing plates are so disposed that the light emitted from a back light, etc., is twisted along the orientation state of the liquid crystal molecules by nearly 90 deg. within the liquid crystal layer and is emitted from the polarizing plate on the active matrix substrate 12 side. Then, the transmitted light of the liquid crystal display panel is transmitted through the liquid crystal layer without being twisted therein. The transmitted light is shut off by the polarizing plates in a normally white mode and is transmitted through the polarizing plates in a normally black mode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a defective pixel in a liquid crystal display device, and more particularly to a method for repairing a defective pixel in a liquid crystal display device by irradiating a laser beam.

[0002]

2. Description of the Related Art Conventionally, an active matrix driving type liquid crystal display device has TFTs (Thin Film Transistor) for pixel electrodes arranged in a matrix on one glass substrate of a pair of glass substrates to be bonded. And MIM (Met
al Insulator Metal) A switching element such as a diode is connected, and each pixel electrode is selected or deselected by the switching operation of this switching element to perform a display operation. Therefore, in the active matrix drive type liquid crystal display device, crosstalk at the time of non-selection, which is a drawback of the simple matrix drive type liquid crystal display device, does not occur, and a high image quality display can be realized.

By the way, the above switching element generally has a multi-layer structure in which a semiconductor layer, an insulating layer, and various electrodes for driving liquid crystal are laminated on a glass substrate. Patterning on the glass substrate is repeated. Therefore, when manufacturing the switching element, there is a possibility that a defective switching element that does not operate normally may occur due to a disconnection or a short circuit. Therefore, the picture element including the picture element electrode connected to the defective switching element is a defective picture element to which no voltage is applied. Especially, in the liquid crystal display device in the normally white mode which is the display operation mode in which the display screen is set to white when the voltage is OFF, this defective pixel is confirmed as a bright spot defect in which light is always transmitted. To be done.

Therefore, various methods have been proposed as a method for repairing a bright spot defect in a liquid crystal display device, in which a bright spot defect is repaired by irradiating a laser beam in the vicinity of the bright spot defect portion of a liquid crystal display panel. For example, Japanese Patent Laid-Open No. 1-1875
No. 32, "Liquid crystal display device" discloses a method of reducing a light transmission amount of a defective picture element by using a laser beam to damage a polarizing plate in a defective picture element portion. In addition, JP-A-3
In the "Method for manufacturing an active liquid crystal panel" of Japanese Patent Laid-Open No. 21928, a color filter of a defective pixel is burnt to gray by a laser beam, and a rubbing surface on the pixel electrode side is heated to disturb the alignment state of liquid crystal. , A method of reducing the light transmission amount of a defective pixel is disclosed. Further, in "Liquid Crystal Display Device and Method for Correcting Defects in Liquid Crystal Display Device" of Japanese Patent Application Laid-Open No. 4-301615, a recessed processed portion is formed on a glass substrate corresponding to a defective pixel by a laser beam, and a bottom surface thereof is roughened. A surface is disclosed to reduce the light transmission amount of the defective picture element. In addition, JP-A-60-24
In "Defective method of liquid crystal display device" of Japanese Patent No. 3635, a defective pixel portion is irradiated with a laser beam to burn an alignment film or a pixel electrode material to lose the alignment regulating force for a liquid crystal layer, A method is disclosed in which the liquid crystal molecules in that portion are randomly arranged to reduce the light transmission amount of the defective pixel.

[0005]

However, in any of the above-mentioned methods for correcting the bright spot defect of the liquid crystal display device, the light transmission amount of the defective pixel is reduced so that the light transmission amount is reduced when the voltage is ON. Light transmission amount between half-tone and voltage OFF (halftone)
However, it has not been possible to completely block the light that passes through the defective pixel.

Therefore, when the liquid crystal display device in which the defective picture element is corrected to the halftone as described above is applied to the magnifying projection type liquid crystal projection apparatus, the entire picture element is enlarged, and the corrected defective picture element is also included. Expanded. Therefore, in such a case, the defect picture element becomes conspicuous and the image quality of the projected image is deteriorated only by making the light transmission amount of the defect picture element halftone.

Further, in the above-mentioned method for correcting each bright spot picture element,
In any case, the amount of energy of the laser beam applied to the defective pixel is not explicitly mentioned. Usually, when a defective pixel is repaired by using a laser beam, it is necessary to irradiate the laser beam on almost the entire surface of the defective pixel. Therefore, when a defective pixel is irradiated with a laser beam having an energy amount equal to or more than a predetermined value, the defective normal pixel is affected, and the problem arises that the display quality of the corrected liquid crystal display device is deteriorated.

The present invention has been made in view of the above problems, and an object thereof is to almost completely eliminate the transmission of light of a defective pixel and to adjoin the defective pixel by irradiation of a laser beam. It is an object of the present invention to provide a defect repairing method for a liquid crystal display device, which can prevent deterioration of the display quality of the liquid crystal display device after repairing the defective pixel by eliminating the influence on the normal pixel.

[0009]

According to another aspect of the present invention, there is provided a method of correcting a defect in a liquid crystal display device, wherein liquid crystal is enclosed between a pair of transparent electrodes, and display picture elements are arranged in a matrix to form a twist nematic mode. In a transmissive liquid crystal display device including a liquid crystal display panel that performs a display operation, the liquid crystal molecules of the liquid crystal layer of the defective pixel existing in the liquid crystal display panel are vertically aligned.

A defect repairing method for a liquid crystal display device according to a second aspect is the defect repairing method for a liquid crystal display device according to the first aspect, in which a laser beam is used to vertically align liquid crystal molecules in the liquid crystal layer of the defective pixel. The feature is that the defective pixel is irradiated.

A defect repairing method for a liquid crystal display device according to claim 3 is the defect repairing method for a liquid crystal display device according to claim 2, wherein two or more irradiation spots of a laser beam are formed on the defective pixel. The feature is that irradiation is performed in a dispersed manner.

A defect repairing method for a liquid crystal display device according to a fourth aspect is the defect repairing method for a liquid crystal display device according to the third aspect, wherein a laser beam is formed into a triangular shape with each irradiation spot on the defect picture element being a vertex. It is characterized by irradiating so as to be arranged in.

[0013]

According to the defect repairing method of claim 1, in the liquid crystal display panel which performs display operation in the twisted nematic mode by vertically aligning the liquid crystal molecules of the liquid crystal layer of the defective pixel, the transmitted light is transmitted through the liquid crystal layer. It transmits without being twisted inside, is blocked by the polarizing plate in the normally white mode, and is transmitted through the polarizing plate in the normally black mode. Thus, by vertically aligning the liquid crystal molecules, it is possible to control the light transmission amount of the defective pixel. Therefore, the defective picture elements existing in the liquid crystal display panel can be made inconspicuous, and as a result, the display quality of the liquid crystal display device after correction can be prevented from being degraded.

According to the defect repairing method of the second aspect, by irradiating the defective pixel with the laser beam, the transparent electrode and the alignment film of the defective pixel are burned at the irradiation spot. As a result, the liquid crystal molecules of the liquid crystal layer of the defective pixel are randomly aligned because there is no transparent electrode and alignment film in the irradiation spot, while they are vertically aligned around the irradiation spot by applying an electric field by the transparent electrode. Therefore, the defective picture element transmits halftone light at the laser beam irradiation spot, while controlling the amount of light transmission around the laser beam irradiation spot. The picture elements as a whole can be made inconspicuous, and as a result, it is possible to prevent the display quality of the liquid crystal display device after correction from being degraded.

According to the defect repairing method of the third aspect, the laser beam is dispersed and irradiated so that two or more irradiation spots are formed on the defect picture element, so that the periphery of the irradiation spot, that is, the laser beam. The influence part of can be increased. As a result, the region where the liquid crystal molecules corresponding to the defective pixel are vertically aligned is enlarged, so that the region where the light transmission amount of the defective pixel can be controlled can be enlarged. Therefore, the defective pixels existing in the liquid crystal display panel can be made inconspicuous, and the display quality of the corrected liquid crystal display device can be prevented from being degraded.

According to the defect repairing method of claim 4, by irradiating the laser beam so that the irradiation spots are arranged in a triangular shape with each vertex as an apex,
The array of laser beam irradiation spots formed on the defective pixel can be a delta array. Thus, by limiting the irradiation spot of the laser beam to the defective pixel, the affected portion of the laser beam at the peripheral edge of the irradiation spot can be limited to the defective pixel. Therefore, when the defective pixel is irradiated with the laser beam, the influence of the laser beam on the normal pixel adjacent to the defective pixel can be reduced, so that only the defective pixel can be corrected.
As a result, it is possible to prevent deterioration of the display quality of the liquid crystal display device after the correction.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS.

The liquid crystal display device applied to the defect correcting method of the liquid crystal display device of the present invention includes a liquid crystal panel (liquid crystal display panel) 7 shown in FIG. The liquid crystal panel 7 has a structure in which a liquid crystal layer 11 is sandwiched between an active matrix substrate 12 and a counter substrate 16 which are arranged to face each other.

On the active matrix substrate 12, picture element electrodes 13 arranged in a matrix and TFTs 10 as switching elements connected to the picture element electrodes 13 are formed on a glass substrate. . Further, in the counter substrate 16, a counter electrode 15 facing the picture element electrodes 13 is formed on a glass substrate. Therefore,
The liquid crystal panel 7 is a transmissive liquid crystal display panel.

The picture element electrodes 13 ... Are made of a transparent conductive film such as an ITO film, and as shown in FIG. 3, matrix picture elements 17 are formed on the liquid crystal panel 7.
Therefore, by the switching operation of the TFT 10, the picture element electrodes 13 ... Of the active matrix substrate 12 are selected or deselected, and the voltage is selectively applied to the picture element 17 to perform the display operation. It is like this.

The active matrix substrate 12 is also provided.
Alignment films 14 and 14 are formed on the contact surface side of the counter substrate 16 and the liquid crystal layer 11, respectively, and the alignment films 14 and 14 align the liquid crystal molecules of the liquid crystal layer 11 by twisting them by approximately 90 °. It is designed to let you.

On the outer surfaces of the active matrix substrate 12 and the counter substrate 16, polarizing plates (not shown) are arranged so that their polarization axes are orthogonal to each other. That is, in each polarizing plate, for example, when light emitted from a backlight or the like enters the liquid crystal layer 11 from the counter substrate 16 side via the polarizing plate, the light is aligned in the liquid crystal layer 11 in the alignment state. It is arranged so as to be emitted from the polarizing plate on the side of the active matrix substrate 12 along with, ie, twisted by about 90 °.

Therefore, the operation mode of the liquid crystal panel 7 is the voltage OFF among the twisted nematic modes.
It becomes a normally white mode in which light is sometimes transmitted and light is blocked when the voltage is turned on.

That is, in the normally white mode liquid crystal panel 7 described above, since liquid crystal molecules are aligned in a state of being twisted at about 90 ° unless a voltage is applied to the liquid crystal layer 11, the liquid crystal molecules are aligned from the counter substrate 16 side. The incident light is transmitted through the polarizing plate on the side of the active matrix substrate 12, while the liquid crystal molecules are aligned in the direction of the electric field, that is, in the direction perpendicular to each electrode when a voltage higher than the threshold value is applied to the liquid crystal layer 11. Therefore, the light incident from the counter substrate 16 side is blocked by the polarizing plate on the active matrix substrate 12 side.

Generally, the TFT 10 has a multi-layer structure in which a semiconductive layer, an insulating layer, a source / drain electrode, a gate electrode, etc. are laminated on a glass substrate, and a normal switching is performed in a manufacturing process of a liquid crystal display element. There is a possibility that the TFT 10 having a defect that does not operate may be formed. The TFT 10 having such a defect has a corresponding pixel electrode 1
Since a voltage cannot be applied to the liquid crystal layer 3, a defective pixel electrode 9 (FIG. 2) in which a voltage cannot be applied to the liquid crystal layer 11 is generated.

Further, such defective pixel electrode 9 drives the liquid crystal panel 7 in the normally white mode described above, and when a voltage is applied to all the pixel electrodes 13 ...
When the light is emitted from the counter substrate 16 side of the liquid crystal panel 7, the light is recognized by searching for the picture element 17 (FIG. 3) in the light transmitting state. Since the picture element 17 in the transmissive state is in a state in which light is always transmitted (bright spot state) regardless of the voltage application to the liquid crystal layer 11, the defective picture element 17 is called a bright spot picture element 18. .

Here, a method of correcting the bright spot picture element 18 generated on the liquid crystal panel 7 will be described below with reference to FIGS. 1 to 3. In this embodiment, an excimer laser is used as a laser light source, and XeF having an oscillation wavelength of 351 nm that passes through a glass surface is used as a gas for enclosing the laser.

First, a defect correction system applied to the defect correction method for the liquid crystal display device of this embodiment will be described.

As shown in FIG. 1, the above defect repair system includes an excimer laser oscillator 1 as a laser light source, and an excimer laser oscillator 1 emits a laser beam on the optical path in order from the excimer laser oscillator 1 side. A mask 2, an ultraviolet reflection mirror 4, a lens 5, a liquid crystal panel 7, and a liquid crystal panel mounting table 8 are arranged. That is, the laser beam 3 emitted from the excimer laser oscillator 1
After passing through the slit of the mask 2 and being reflected by the ultraviolet reflecting mirror 4, the light is focused on the correction portion 6 of the liquid crystal panel 7 mounted on the liquid crystal panel mounting base 8 via the lens 5.

When the laser beam 3 of the excimer laser oscillator 1 is focused on the correction portion 6 of the liquid crystal panel 7,
The defective pixel electrode 9 of the liquid crystal panel 7, the counter electrode 15 facing the defective pixel electrode 9, and the alignment films 14 and 14 (hatched portions in FIG. 2) are set to an output capable of burning.

As shown in FIG. 3, the mask 2 has slits formed on the bright spot picture element 18 of the correction portion 6 of the liquid crystal panel 7 so that a plurality of irradiation spots 19 of the laser beam 3 can be formed. ing. In this case, the mask 2 is formed with slits so that the irradiation spots 19 are located at the vertices of a triangle, that is, the slits are in a delta arrangement.
As a result, the irradiation spots 19 of the laser beam 3 are formed on the bright spot picture element 18 in a delta arrangement.

Next, a method of repairing the bright spot picture element 18 existing in the liquid crystal panel 7 by the above defect repair system will be described. The size of the opening of the bright pixel 18 is 60 ×
60 μm, and accordingly, the pulse number of the laser beam 3 emitted from the excimer laser oscillator 1 is 10
Times, energy density 0.7 J / cm, frequency 1H
z, the beam diameter is set to 60 μm, and the slit diameter of the mask 2 is set to 10 μm.

First, the bright spot picture element 1 existing on the liquid crystal panel 7.
Check item 8. In this case, the voltage is turned on while the polarizing plates are provided above and below the liquid crystal panel 7 and the light transmission state is observed, and the picture element in the light transmission state is confirmed as the bright spot picture element 18. However, the operation mode of the liquid crystal panel 7 is a normally white mode.

Next, the liquid crystal panel 7 in which the positions of the bright spot picture elements 18 are confirmed is placed on a predetermined position of the liquid crystal panel placing table 8,
The correction part 6 is set according to the position of the bright spot picture element 18.
At this time, the polarizing plate of the liquid crystal panel 7 is removed.

Next, the laser beam 3 set to a predetermined output from the excimer laser oscillator 1 is focused on the correction portion 6 of the liquid crystal panel 7 through the mask 2, the ultraviolet reflecting mirror 4 and the lens 5, and a bright dot picture is formed. Correct the element 18. Then, after the bright spot picture element 18 is corrected, a polarizing plate is arranged on the liquid crystal panel 7 again.

Therefore, in the corrected portion 6, as shown in FIG. 3, irradiation spots 19 ... Are arranged in a delta pattern on the bright spot picture elements 18 and the irradiation spots 1 are formed.
On the concentric circles 9 ..., Laser irradiation-affected areas 20 ... Which are influenced by the laser beam 3 are formed. At this time, the output of the laser beam 3 is set so as to burn the pixel electrode 13, the counter electrode 15, and the alignment film 14 as described above. Two
While the defective pixel electrode 9 shown in (4), the counter electrode 15 and the alignment films 14 and 14 corresponding to the defective pixel electrode 9 are burned,
In the laser irradiation affected area 20, the defective pixel electrode 9, the counter electrode 15, and the alignment films 14 and 14 remain.

As a result, in the liquid crystal layer 11 corresponding to the irradiation spot 19, the defective pixel electrode 9, the counter electrode 15 and the alignment films 14 and 14 are eliminated, so that the liquid crystal molecules are randomly arranged and the laser irradiation affected part. In the liquid crystal layer 11 corresponding to 20, since only the alignment films 14 and 14 are lost and the defective pixel electrode 9 and the counter electrode 15 remain, the liquid crystal molecules are in a state in which an electric field is applied by each remaining electrode, Direction, that is, a direction perpendicular to each substrate.

As described above, the liquid crystal panel 7 after the bright spot picture element 18 has been corrected has polarizing plates provided above and below, and when light from the counter substrate 16 side is transmitted when the voltage is turned on, it is shown in FIG. As described above, the corrected bright spot picture element 18 is in a state of hardly transmitting light. Here, the light-transmitting area of the liquid crystal panel 7 is indicated by a white portion, and the light-shielded area is indicated by a shaded portion.

That is, after the bright spot picture element 18 is irradiated with the laser beam 3, the irradiation spot 19 of the bright picture element 18 is ...
In this case, since the liquid crystal molecules are randomly arranged, the light transmission amount becomes an intermediate amount between when the voltage is turned on and when the voltage is turned off, that is, halftone luminance, and the laser irradiation affected portion 2 of the bright spot picture element 18
In 0, the liquid crystal molecules are vertically aligned, so that light is blocked by the polarizing plate.

Therefore, as described above, the laser beam 3
By irradiating the bright spot picture element 18 with light, the amount of light transmitted through the bright spot picture element 18 can be significantly reduced.
The bright spots of can be made inconspicuous. As a result, even when the liquid crystal panel 7 after the bright spot picture element 18 is corrected is used in a liquid crystal display device, it is possible to prevent the display quality of an image from being degraded. For example, when the liquid crystal panel 7 after the correction of the bright spot picture element 18 is applied to a magnifying projection type liquid crystal projection device, the corrected defective picture element is not conspicuous even if the whole picture element is magnified. The decrease can be prevented.

In general, when the bright spot picture element 18 is modified by using the laser beam, as shown in FIG. 5, the irradiation spot 19 corresponding to the shape of the bright spot picture element 18 is formed by the irradiated laser beam. 'And the laser irradiation affected area 20' are formed. In this case, since the irradiation spot 19 'is formed in such a size that the bright spot picture element 18 can be corrected, the laser irradiation affected area 20' also becomes large, and even up to the picture element 17 adjacent to the bright spot picture element 18. It has an influence. Therefore, when the bright spot picture element 18 is modified, the laser beam influences the adjacent normal picture elements 17 ..., and the display quality of the modified liquid crystal display device is degraded.

On the other hand, in the present application, as shown in FIG. 3, since the irradiation spots 19 are formed in the delta arrangement on the bright spot picture element 18, the influence of the laser beam 3 is exerted. Can be made smaller. Therefore, even if the bright spot picture element 18 is irradiated with the laser beam 3 for correction, it does not affect the normal picture elements 17 adjacent to the bright spot picture element 18 ... The liquid crystal display device can be corrected, and as a result, the display quality of the liquid crystal display device after the correction can be improved.

Further, in the present embodiment, the output of the laser beam 3 is set under the above-mentioned conditions, but the present invention is not limited to this, and the energy density of the laser beam 3 may be variable, for example. In this case, if the energy density of the laser beam 3 is set smaller than the value of the above-mentioned embodiment, the formation area of the laser irradiation-affected portion 20 becomes smaller, and the energy density of the laser beam 3 is smaller than that of the above-mentioned embodiment. If is also set to be large, the formation area of the laser irradiation-affected portion 20 becomes large. Accordingly, by changing the energy density of the laser beam 3, it is possible to change the size of the region where the vertically aligned liquid crystal molecules are present in the bright spot picture element 18. Therefore, the light transmission amount of the bright spot picture element 18 can be arbitrarily changed.

[0044]

As described above, according to the defect repairing method for a liquid crystal display device of the present invention, the liquid crystal is sealed between the pair of transparent electrodes, and the picture elements for display are arranged in a matrix. In a transmissive liquid crystal display device including a liquid crystal display panel that performs a display operation in a twist nematic mode, liquid crystal molecules of a liquid crystal layer of a defective pixel existing in the liquid crystal display panel are vertically aligned to correct the defective pixel.

As a result, the defective picture elements existing in the liquid crystal display panel can be made inconspicuous, and as a result, the display quality of the liquid crystal display device after the defect correction can be prevented from being degraded.

As described above, the defect repairing method for a liquid crystal display device according to a second aspect of the present invention irradiates the defective pixel with a laser beam in order to vertically align the liquid crystal molecules of the liquid crystal layer of the defective pixel. Correct the defective pixel.

With this, in addition to the effect of the first aspect, the liquid crystal molecules of the liquid crystal layer of the defective pixel can be randomly aligned at the irradiation spot, but can be vertically aligned around the irradiation spot.

Therefore, the defective picture element transmits halftone light at the laser beam irradiation spot, while the light transmission amount can be controlled around the laser beam irradiation spot, so that the liquid crystal display panel can be controlled. The existing defective picture elements can be made inconspicuous as a whole, and as a result, the display quality of the liquid crystal display device after correction can be prevented from being degraded.

In the defect repairing method for a liquid crystal display device according to a third aspect of the present invention, as described above, the laser beam is dispersed and irradiated so that two or more irradiation spots are formed on the defective pixel. Correct the defective pixel.

As a result, in addition to the effect of the second aspect, the region where the liquid crystal molecules are vertically aligned is enlarged, so that the region which blocks the transmission of light of the defective pixel can be enlarged.

Therefore, since the area where the light transmission amount of the defective picture element can be controlled is enlarged, the defective picture element existing in the liquid crystal display panel can be made inconspicuous, and the display quality of the liquid crystal display device after correction can be improved. The effect that it can prevent a fall is produced.

As described above, the defect repairing method for a liquid crystal display device according to a fourth aspect of the present invention irradiates a laser beam so that each irradiation spot is arranged in a triangular shape with each vertex as a vertex on the defect picture element. By doing so, the defective picture element is corrected.

As a result, in addition to the effect of the third aspect, it is possible to reduce the influence of the irradiation spot of the laser beam on the adjacent picture element, so that it is possible to correct only the defective picture element.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a defect repair system configured by applying a defect repair method for a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the liquid crystal display panel modified in FIG.

FIG. 3 is a plan view showing a state in which a defect pixel of the liquid crystal display panel shown in FIG. 2 is irradiated with a laser beam.

FIG. 4 is a schematic diagram showing a state of the liquid crystal panel corrected by the defect correction system of FIG. 1 as seen from the active matrix substrate side when light is emitted from the counter substrate side when the voltage is OFF.

FIG. 5 is a plan view showing a conventional defect repairing method for a liquid crystal display device and showing a state where a defective pixel of a liquid crystal display panel is irradiated with a laser beam.

[Explanation of symbols]

 1 Excimer Laser Oscillator 3 Laser Beam 7 Liquid Crystal Panel (Liquid Crystal Display Panel) 9 Defect Picture Electrode 10 TFT 11 Liquid Crystal Layer 12 Active Matrix Substrate (Transparent Electrode Substrate) 13 Picture Element Electrode 14 Alignment Film 15 Counter Electrode 16 Counter Substrate (Transparent Electrode) Substrate) 17 Picture element 18 Bright spot picture element (Defect picture element) 19 Irradiation spot

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Osamu Miyazaki 22-22 Nagaike-cho, Abeno-ku, Osaka, Osaka Within the corporation

Claims (4)

[Claims] 1. A liquid crystal display device comprising a transmissive liquid crystal display panel in which liquid crystal is enclosed between a pair of transparent electrodes, display picture elements are arranged in a matrix, and a display operation is performed in a twisted nematic mode. The defect repairing method for a liquid crystal display device, wherein the liquid crystal molecules of the liquid crystal layer of the defective pixel existing in the liquid crystal display panel are vertically aligned. 2. A defect repairing method for a liquid crystal display device according to claim 1, wherein a laser beam is applied to the defect picture element in order to vertically align the liquid crystal molecules of the liquid crystal layer of the defect picture element. 3. A defect repairing method for a liquid crystal display device according to claim 2, wherein the laser beam is dispersed and irradiated so that two or more irradiation spots are formed on the defective picture element. 4. The defect correction of a liquid crystal display device according to claim 3, wherein the laser beam is applied so that the irradiation spots are arranged in a triangular shape with each vertex on the defect picture element. Method.