KR101269004B1 - The method for improving the unwanted brightness of a color filter using IR-Laser - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing bright spot defects by using an ultraviolet laser, and in particular, a short generated in a channel portion of a thin film transistor for a liquid crystal display, or a color loss of a pigment generated during a manufacturing process of a color filter substrate. For example, the present invention relates to improving a bright spot defect in which a pixel at a defective position is brighter than a normal pixel when the screen is driven.

To this end, in the present invention, after placing a black resin (polyethylene terephthalate) film coated with a black resin (black resin) on the substrate corresponding to the defective pixel, by irradiating the black resin with an ultraviolet laser (IR-Laser) from the top When the adhesive is adhered to the substrate, since the light incident from the backlight is blackened by the black resin, dark spots in which the defective pixels cannot be observed with the naked eye are progressed to remove the bright spots.

Description

The method for improving the unwanted brightness of a color filter using IR-Laser}

1 is a cross-sectional view showing some pixels of a conventional array substrate for a thin film transistor liquid crystal display device;

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. FIG.

3 is an enlarged view of a portion A of FIG. 1, in particular, illustrating a case in which a short occurs in a thin film transistor unit; FIG.

4 is a cross-sectional view schematically illustrating a case where a bad pixel is generated in a conventional thin film transistor liquid crystal display.

5 is a cross-sectional view schematically showing a thin film transistor liquid crystal display device according to the present invention.

6A and 6B illustrate a method of bonding black resin to a substrate using an ultraviolet laser (IR-Laser).

Description of the Related Art [0002]

200: upper substrate 220a, 220b, 220c: red, green, blue sub color filter

225: black matrix

230: liquid crystal layer 240: protective film

250: lower substrate 255: array element

257 upper alignment layer 258 lower alignment layer

270: seal pattern 280: backlight

290, 295: first and second black resin pattern

PA: pixel area

NPA: non-pixel area

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film transistor liquid crystal display device, and more particularly, to improve light point defects of color filters by attaching light blocking means using an ultraviolet laser (IR-Laser).

Generally, the driving principle of a liquid crystal display device utilizes the optical anisotropy and polarization properties of a liquid crystal. Since the liquid crystal has a long structure, it has a directionality in the arrangement of molecules, and the direction of the molecular arrangement can be controlled by artificially applying an electric field to the liquid crystal.

Accordingly, if the molecular arrangement direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular arrangement direction of the liquid crystal due to optical anisotropy to express image information.

In addition, the liquid crystal display includes a color filter substrate on which a common electrode is formed, an array substrate on which a pixel electrode is formed, and a liquid crystal filled between the two substrates. By driving the liquid crystal, it is excellent in characteristics such as transmittance and aperture ratio.

Hereinafter, a conventional thin film transistor liquid crystal display device will be described with reference to the accompanying drawings.

FIG. 1 is a plan view illustrating some pixels of a conventional array substrate for a thin film transistor liquid crystal display device, and FIG. 2 is a cross-sectional view taken along line II-II of FIG.

As illustrated, the gate wiring 20 is formed in one direction on the substrate 10, and the gate electrode 36 is formed by extending from the gate wiring 20.

The gate insulating layer 45 is formed on one of the inorganic insulating materials such as silicon nitride (SiNx) or silicon oxide (SiO ₂ ).

An active layer 40 made of pure amorphous silicon and an ohmic contact layer 41 made of impurity amorphous silicon are stacked on the gate insulating layer 45.

The data line 30 is formed to intersect the gate line 20 perpendicularly to define the pixel region P, and the data line 30 is partially overlapped with the gate line 20. The source electrode 32 extended from and the drain electrode 34 spaced apart from each other are configured.

In this case, the ohmic contact layer 41 positioned in the interval between the source and drain electrodes 32 and 34 is removed to expose the active layer 40, and the portion is used as a channel ch.

A passivation layer 55 is formed on the upper surface of the source and drain electrodes 32 and 34 by one selected from a group of inorganic insulating materials such as silicon nitride (SiNx) or silicon oxide (SiO ₂ ), and a part of the drain electrode 34. The pixel electrode 50 in contact with the drain electrode 34 through the drain contact hole CH1 exposing is formed in the pixel region P.

In the process of manufacturing the array wiring in the above-described configuration, a short between the wirings due to foreign matters may occur, and in particular, a short occurs frequently between the source and drain electrodes located in the thin film transistor.

Hereinafter, this will be described in detail with reference to the accompanying drawings.

FIG. 3 is an enlarged view of a portion A of FIG. 1, and in particular, when a short occurs in the thin film transistor unit, it is a diagram schematically illustrating cutting using a laser. Here, the same reference numerals are given to the same names as in FIG. 1.

As shown, the source and drain electrodes 32 and 34 are spaced apart from each other, the source electrode 32 extends from the data line 30, and the drain electrode 34 is the source electrode 32. And spaced apart.

Here, a state in which a short is generated due to the foreign matter 65 falling off in the interval between the source and drain electrodes 32 and 34 spaced apart during the substrate cleaning process and the deposition process of the array wiring.

Since the short paralyzes the function of the thin film transistor, the pixel connected thereto acts as a bright point. Therefore, the B or C portion of the source electrode 32 or the drain electrode 34 is cut by using a laser (not shown) to change the pixel that acted as the bright spot into the dark spot.

However, when the laser is used, the strong energy of the laser affects the lower layer, which causes damage to the wiring located in the lower layer. In addition, contamination of particles by the laser is generated, which adversely affects the performance of the thin film transistor (T in FIG. 1).

In addition, although not shown in the drawings, in the process of manufacturing the red, green, and blue sub-color filter formed in the color filter substrate, defects may occur due to color loss of the red, green, and blue pigments.

Therefore, due to the short-circuit between the source and drain electrodes described above, or defects such as color loss of red, green, and blue pigments, bright spot defects in which the pixel at the defective position is brighter than the normal pixels are generated when the screen is driven. This is a factor in lowering yield and increasing manufacturing cost.

This will be described in detail with reference to the accompanying drawings.

4 is a cross-sectional view schematically illustrating a case where a bad pixel is generated in a conventional thin film transistor liquid crystal display, and will be described with reference to this.

As shown, the color filter substrate as the upper substrate 100 and the array substrate as the lower substrate 150 face each other, and the liquid crystal layer 130 is interposed between the upper and lower substrates 100 and 150.

A seal pattern 170 is formed at both outermost sides of the upper and lower substrates 100 and 150 to seal both the substrates 100 and 150, and a lower portion of the lower substrate 150 serves as a light source. The backlight 180 is positioned.

An array element 155 is formed on the pixel area PA on the transparent substrate 151 that is divided into the pixel area PA and the non-pixel area NPA of the lower substrate 150. A lower alignment layer 158 is formed on the upper front surface of the 155 for protecting it and for initial alignment of the liquid crystal.

The red, green, and blue sub color filters 120a, 120b, and 120c are sequentially formed on the transparent substrate 101 of the upper substrate 100 to correspond to the pixel area PA of the lower substrate 150. The black matrix 125 for blocking the mixed color and non-pixel sections NPA of each of the color filters 120a, 120b, and 120c is configured to correspond to the non-pixel region NPA of the lower substrate 150.

In addition, a passivation layer 140 is formed on the entire upper surface of the substrate 101 on which the black matrix 125 and the color filters 120a, 120b, and 120c are formed, and the upper portion having the same function as the lower alignment layer 158. The alignment film 157 is formed.

In this case, the light incident from the backlight 180 passes through the lower substrate 150 and the liquid crystal layer 130, and then passes through each of the color filters 120a, 120b, and 120c configured in the upper substrate 100. When the screen is driven, the F or G part where the defective pixel is located is transmitted more than the normal pixel due to the short circuit between the source and drain electrodes or the color deterioration of red, green, and blue pigments. It increases, causing the bright spots to appear brighter with the naked eye.

The occurrence of such bright spots acts as a factor in lowering yield and increasing manufacturing cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a pixel which is defective when driving a screen due to a short such as a short occurring in an array element for a thin film transistor liquid crystal display or a color loss of a pigment used in a color filter, etc. It aims to improve the yield by eliminating bright spot defects that appear brighter than normal pixels.

Laser adhesion method according to the present invention for achieving the above object is a step of positioning a substrate, a polyethylene resin (polyethylene terephthalate) film coated with a black resin (black resin) on the substrate, and spaced apart from the PET film Aligning the laser to the laser, irradiating the laser onto the PET film, and exothermic reaction to the black resin by heat radiated from the laser, thereby adhering the black resin to the substrate. It is done.

The laser emits ultraviolet (Infra-Red: IR).

The thin film transistor liquid crystal display device according to the present invention is composed of a first substrate and a second substrate divided into a pixel area and a non-pixel area are bonded to each other, and in the liquid crystal display device in which defective pixels are generated at an arbitrary position,

An array element formed on one surface of the second substrate, a second alignment layer formed on the array element, and a surface of the first substrate facing the second substrate, and corresponding to the non-pixel region A black filter positioned and a color filter configured to correspond to the pixel region with the black matrix as a boundary;

A first alignment layer formed on the black matrix and the color filter, a liquid crystal layer interposed between the first and second substrates, a seal pattern formed at the outermost portions of the first and second substrates, And a black resin pattern configured to correspond to the defective pixel, and a backlight configured to be spaced apart from the second substrate.

In this case, the black resin pattern is simultaneously configured on the outer surface of the first substrate or the second substrate corresponding to the defective pixel, or the outer surfaces of the first and second substrates.

The black resin pattern is bonded by a laser and includes an optical member between the second substrate and the backlight.

According to an aspect of the present invention, there is provided a method of manufacturing a thin film transistor liquid crystal display, in which a first substrate and a second substrate divided into a pixel region and a non-pixel region are bonded to each other, and a defective pixel is generated at an arbitrary position. In the liquid crystal display device,

Forming an array element on an opposite surface of the second substrate, forming a second alignment layer on the array element, and forming an array element on one surface of the first substrate facing the second substrate, Forming a black matrix corresponding to the non-pixel region, and forming a color filter corresponding to the pixel region using the black matrix as an interface;

Forming a first alignment layer on the black matrix and the color filter, forming a seal pattern on the outermost portions of the first and second substrates, and separating the first and second substrates from each other. And injecting a liquid crystal through an injection hole, and adhering a black resin pattern corresponding to the defective pixel.

In this case, the black resin pattern is bonded by a laser using ultraviolet rays, the black resin pattern is the outer surface of the first substrate or the second substrate corresponding to the defective pixel, or the outer surface of the first and second substrate Is configured at the same time.

Hereinafter, a liquid crystal display device according to the present invention will be described with reference to the accompanying drawings.

FIG. 5 is a cross-sectional view illustrating a thin film transistor liquid crystal display device according to an exemplary embodiment of the present invention, in which the same names as in FIG.

According to an exemplary embodiment of the present invention, a PET (polyethylene terephthalate) film coated with a black resin is disposed on an outer surface of a color filter substrate or an array substrate in a liquid crystal display device in which a bright spot is generated, and an ultraviolet laser spot is generated in the spot. When the black resin is bonded to the substrate by irradiating on, the defective pixel, which acted as a bright point by the black resin, acts as a dark spot, thereby improving yield and lowering the manufacturing cost by removing the bright spot.

As shown, the color filter substrate as the upper substrate 200 and the array substrate as the lower substrate 250 face each other, and the liquid crystal layer 230 is interposed between the upper and lower substrates 200 and 250.

A seal pattern 270 is formed at both outermost sides of the upper and lower substrates 200 and 250 to seal both the substrates 200 and 250, and a lower portion of the lower substrate 250 serves as a light source. The backlight 280 is positioned.

An array element 255 is formed in the pixel area PA on the transparent substrate 251 that is divided into the pixel area PA and the non-pixel area NPA of the lower substrate 250. A lower alignment layer 258 is formed on the upper front surface of the 255 for protecting it and for initial alignment of the liquid crystal.

The red, green, and blue sub color filters 220a, 220b, and 220c are sequentially formed on the transparent substrate 201 of the upper substrate 200 to correspond to the pixel area PA of the lower substrate 250. The black matrix 225 for blocking the mixed and non-display sections of the color filters 220a, 220b, and 220c is formed at a position corresponding to the non-pixel area NPA of the lower substrate 250.

In addition, a passivation layer 240 is formed on the entire upper surface of the substrate 201 on which the black matrix 225 and the color filters 220a, 220b, and 22c are formed, and the upper portion having the same function as the lower alignment layer 258. An alignment film 257 is formed.

Although not shown in the drawings, a common electrode may be further configured between the passivation layer 240 and the upper alignment layer 257.

In addition, the first and second black resin patterns 290 and 295 may correspond to the H and I portions in which defective pixels generated by one of the above-described causes are located on the outer surfaces of the upper and lower substrates 200 and 250. Bond it. Here, the first and second black resin patterns 290 and 295 may be adhered to the outer surfaces of the upper and lower substrates 200 and 250, respectively, but the upper or lower substrate 200, In 250), it may be adhered only to any selected substrate.

In this case, the light incident from the backlight 280 passes through the lower substrate 250 and the liquid crystal layer 230, and then passes through the color filters 220a, 220b, and 220c of the upper substrate 200. To implement the screen.

Here, in the liquid crystal display according to the present invention, even if any defective pixel occurs, the defective pixel is caused by the first and second black resin patterns 290 and 295 adhered to the outer surface of the upper or lower substrates 200 and 250. It is possible to block or absorb the light incident to the prior.

Therefore, in the present invention, even if defective pixels are generated due to defects in the array substrate or the color filter substrate for the liquid crystal display device, when black resin is adhered to the outer surfaces of both substrates, light incident to the defective pixels is blocked or absorbed in advance. As a result, the defective pixels, which were seen as bright spots, can be seen as dark spots so that the bright spots can be eliminated.

6A and 6B illustrate a method of adhering a black resin to a substrate, which will be described in detail with reference to the drawings.

As shown in FIG. 6A, a polyethylene terephthalate (PET) film 310 having a black resin 320 coated thereon is positioned on the substrate 300.

Next, as shown in Figure 6b, when irradiated with an ultraviolet laser (IR-Laser) to the selected area on the PET film 310, the black resin 320 is applied to the heat of the ultraviolet beam (IR-beam) As a result of the exothermic reaction, the black resin pattern 340 corresponding to the selected region is adhered to the substrate 300.

Therefore, in the present invention, when a black resin pattern is formed corresponding to a pixel in which defective pixels are generated in a liquid crystal display device in which defective pixels are generated, the light incident from the backlight is blackened by the black resin pattern, and thus is visually observed. Defective pixels, which were seen as bright spots, appear as dark spots, and thus can be removed.

However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, the thin film transistor liquid crystal display device according to the present invention may be applied to a transverse electric field type liquid crystal display device in which a common electrode and a pixel electrode are formed on the same substrate, and may be applied to an overall flat panel display device.

In the present invention, the PET film coated with the black resin is placed on the outer surface of the color filter substrate or the array substrate, and when the ultraviolet laser is irradiated to the area where the bright spot is generated, the black resin is adhered to the substrate. As a result, the defective pixel acts as a dark spot, thereby improving yield and lowering the manufacturing cost by removing the bright point defect.

Claims (9)

Positioning a polyethylene terephthalate (PET) film coated with a black resin on a substrate so that the substrate and the black resin face each other; Aligning a laser to the top spaced apart from the PET film; Irradiating a beam of the laser onto a selected area of the PET film; Heat generation of the black resin corresponding to the selected region by heat of the beam irradiated from the laser causes the black resin corresponding to the selected region to be bonded to the substrate to form a black resin pattern Laser bonding method comprising a. The method of claim 1, The laser bonding method of claim 1, wherein the laser emits ultraviolet (Infra-Red: IR). In a liquid crystal display device in which a first pixel and a second substrate divided into a pixel region and a non-pixel region are bonded to each other, and a defective pixel is generated at an arbitrary position, An array element configured to face one surface of the second substrate; A second alignment layer formed on the array element; A black matrix formed on one surface of the first substrate facing the second substrate and positioned corresponding to the non-pixel region; A color filter configured to correspond to the pixel region with the black matrix as a boundary; A first alignment layer formed on the black matrix and the color filter; A liquid crystal layer interposed between the first and second substrates; A seal pattern formed at outermost portions of the first and second substrates; A black resin pattern configured to correspond to the defective pixel; A backlight configured below the second substrate and spaced apart from the second substrate Liquid crystal display comprising a. The method of claim 3, wherein And the black resin pattern is formed on an outer surface of the first substrate or the second substrate corresponding to the defective pixel or on the outer surfaces of the first and second substrates. The method of claim 3, wherein The black resin pattern is a liquid crystal display, characterized in that the adhesive is configured by a laser. The method of claim 3, wherein And an optical member between the second substrate and the backlight. In a liquid crystal display device in which a first pixel and a second substrate divided into a pixel region and a non-pixel region are bonded to each other, and a defective pixel is generated at an arbitrary position, Forming an array element on an opposite surface of the second substrate; Forming a second alignment layer on the array element; Forming a black matrix formed on one surface of the first substrate facing the second substrate and corresponding to the non-pixel region; Forming a color filter corresponding to the pixel area, using the black matrix as a boundary; Forming a first alignment layer on the black matrix and the color filter; Forming a seal pattern on outermost portions of the first and second substrates; Injecting liquid crystal through a liquid crystal injection hole configured to be spaced apart from the first and second substrates; Adhering a black resin pattern in response to the defective pixel; Liquid crystal display device manufacturing method comprising a. The method of claim 7, wherein The black resin pattern is bonded by a laser using ultraviolet light. The method of claim 7, wherein And the black resin pattern is formed on an outer surface of the first substrate or the second substrate corresponding to the defective pixel or on the outer surfaces of the first and second substrates.

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