KR20080068161A - Liquid crystal display panel and method of manufacturing the same - Google Patents

Abstract

A liquid crystal panel and a method for manufacturing the same are provided to reduce a manufacturing cost and to form a sealing member by using a photo-curable composition for the formation of a light blocking layer in forming a sealing member. A liquid crystal panel(100) comprises a TFT array substrate(120), a color filter substrate(110), a liquid crystal layer(140), and a sealing member(130). The TFT array substrate comprises an array of TFTs. The color filter substrate comprises color filters(113). The liquid crystal layer is inserted between the TFT array substrate and the color filter substrate. The sealing member, which combines the TFT array substrate with the color filter substrate, comprises a paint. The paint comprises a black paint, such as carbon black. The color filter substrate comprises a display area(DA) and a peripheral area(PA) which encloses the display area. A light blocking layer(112) is formed between the sealing member and the display area.

Description

Liquid crystal display panel and its manufacturing method {LIQUID CRYSTAL DISPLAY PANEL AND METHOD OF MANUFACTURING THE SAME}

1 is a cross-sectional view showing a liquid crystal display panel according to an embodiment of the present invention;

2 to 5 are process diagrams illustrating a method of manufacturing a liquid crystal display panel according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

100 liquid crystal display panel 110 color filter substrate

120: thin film transistor substrate 130: sealing member

140: liquid crystal layer 300: mask

The present invention relates to a liquid crystal display panel and a method for manufacturing the same, and more particularly, to a liquid crystal display panel and a method for manufacturing the same, which can reduce manufacturing costs and improve display quality.

In general, a liquid crystal display device displays an image by using optical and electrical properties of the liquid crystal material. The liquid crystal display device has advantages such as light weight, low power, and low driving voltage compared to a CRT and a plasma display panel.

The liquid crystal display device includes a thin film transistor substrate, a color filter substrate, and a liquid crystal layer disposed between the substrates. Light generated from the light source passes through the liquid crystal layer, and the liquid crystal layer displays an image by adjusting the transmittance of the light.

The liquid crystal display device includes a sealing member for bonding the thin film transistor substrate and the color filter substrate to seal the liquid crystal layer. The sealing member is generally formed using a sealing composition comprising a binder resin, a crosslinking agent, a polymerization initiator, a filler, and the like, and the sealing composition includes a sealing spacer for maintaining a gap between the substrates.

The sealing spacers are expensive and there is a fear of agglomeration between the substrates by agglomeration with each other in the sealing member. In addition, there is a fear that adjacent liquid crystals may be contaminated by the uncured crosslinking agent, the polymerization initiator, or the like of the sealing composition.

Accordingly, the technical problem of the present invention is to solve such a conventional problem, and to provide a liquid crystal display panel which can reduce manufacturing costs and improve display quality.

Another object of the present invention is to provide a method of manufacturing the liquid crystal display panel.

According to an aspect of the present invention, a liquid crystal display panel includes a thin film transistor substrate, a color filter substrate, a liquid crystal layer disposed between the thin film transistor substrate and the color filter substrate, and a sealing member for coupling the thin film transistor substrate and the color filter substrate. Include. The thin film transistor substrate includes a thin film transistor array, and the color filter substrate includes a color filter. The sealing member includes a pigment.

Specifically, the pigment may include a black pigment, and the black pigment may include carbon black.

The color filter substrate may include a display area and a peripheral area surrounding the display area, and may further include a light blocking layer formed between the sealing member and the display area.

According to the method of manufacturing a liquid crystal display panel according to an aspect of the present invention, a resin layer is formed by coating a photocurable composition including a pigment on a peripheral region of a color filter substrate including a color filter. A portion of the resin layer is irradiated with ultraviolet rays through a mask to form a sealing spacer pattern. The thin film transistor substrate including the thin film transistor substrate array is aligned to be in contact with the resin layer. Ultraviolet rays are irradiated onto the resin layer to couple the color filter substrate and the thin film transistor substrate.

The pigment may include a black pigment, and the photocurable composition may further include a binder resin, a crosslinking agent, a photopolymerization initiator, and a solvent in addition to the pigment.

The forming of the sealing spacer pattern may be performed by using a mask including a light transmission pattern corresponding to the sealing spacer pattern.

For example, the sealing spacer pattern may have a column shape having a substantially circular cross section.

As described above, the manufacturing cost of the liquid crystal display panel can be reduced, and the display quality can be improved by preventing contamination of the liquid crystal layer.

Hereinafter, a liquid crystal display panel according to an exemplary embodiment of the present invention and a method of manufacturing the same will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view illustrating a liquid crystal display panel according to an exemplary embodiment of the present invention. The liquid crystal display panel 100 includes a color filter substrate 110, a thin film transistor substrate 120, a sealing member 130, and a liquid crystal layer 140 disposed between the color filter substrate 110 and the thin film transistor substrate 120. ). The liquid crystal display panel 100 may further include a spacer (not shown) disposed between the color filter substrate 110 and the thin film transistor substrate 120 to maintain a gap between the substrates.

The color filter substrate 110 may include a base substrate 111, a light blocking layer 112, a color filter 113, and a common electrode 114. The color filter substrate 110 includes a display area DA and a peripheral area PA surrounding the display area.

The base substrate 111 may be made of a transparent material having high light transmittance, for example, glass.

The light blocking layer 112 may be formed on the base substrate 111 and may include an opaque material having a low light transmittance, for example, a colorant such as carbon black. The light blocking layer 112 prevents color mixing of light passing through the color filter 113 and increases resolution. The light blocking layer 112 may be formed between each pixel of the display area DA and may be formed on the peripheral area PA to distinguish the display area DA from the peripheral area PA. have. The light blocking layer 112 formed on the peripheral area PA has a wider width than the light blocking layer formed between each pixel of the display area DA.

In an exemplary embodiment, the light blocking layer 112 formed between the display area DA and the peripheral area PA has a width of about 1.4 mm to about 1.6 mm, which is about 2.4 mm smaller than that of the conventional light blocking layer. It is preferred to have a width of from about 2.6 mm.

The color filter 113 may be formed on the base substrate 111 to partially overlap with the light blocking layer 112 or partially overlap with another adjacent color filter 113. The color filter 113 may include, for example, a red color filter, a green color filter, and a blue color filter, and may include pigments and / or dyes corresponding to each color.

The color filter substrate 110 may further include an organic insulating layer (not shown) covering the light blocking layer 112 and the color filter 113. The organic insulating layer protects the light blocking layer 112 and the color filter 113, and compensates for the step difference caused by the light blocking layer 112 and the color filter 113. Level the surface. The organic insulating layer may be formed of a synthetic resin such as acrylic.

The common electrode 114 is formed on the base substrate 111 to cover the light blocking layer 112 and the color filter 113. The common electrode may be made of a transparent conductive material, for example, indium tin oxide or indium zinc oxide. A predetermined common voltage is applied to the common electrode 114. In some cases, the common electrode 114 may be formed on the thin film transistor substrate 120.

The color filter substrate 110 may further include an alignment layer for orienting liquid crystal molecules of the liquid crystal layer 140. The alignment layer may be made of a synthetic resin, for example, a polyimide resin.

The thin film transistor substrate 120 includes a base substrate 121, a gate electrode 122, a gate insulating layer 123, a channel layer 124a, an ohmic contact layer 124b, a source electrode 125, and a drain electrode 126. The passivation layer 127, the planarization layer 128, and the pixel electrode 129 may be included.

The gate electrode 122 is formed on the base substrate 121 and receives a gate signal from a gate line (not shown). The gate electrode 122 may be formed of, for example, aluminum, an aluminum alloy, molybdenum, molybdenum alloy, chromium, or the like, and may have a single layer or a multilayer structure.

The gate insulating layer 123 covers the gate electrode 122 and may be made of an insulating material such as silicon oxide or silicon nitride.

The channel layer 124a is formed on the gate insulating layer 123 to overlap the gate electrode 121 and may be made of amorphous silicon. A pair of ohmic contact layers 124b spaced apart from each other are formed on the channel layer 124a, and the ohmic contact layer 124b may be formed of amorphous silicon doped with impurities.

The source electrode 125 and the drain electrode 126 are formed on the ohmic contact layer 124b. The source electrode 125 and the drain electrode 126 are spaced apart from each other to expose a portion of the channel layer 124a. A portion of the drain electrode 126 is electrically connected to the pixel electrode 129 through the connection hole CH of the planarization film 128.

The passivation layer 127 covers the source electrode 125, the drain electrode 126, and the exposed channel layer 124a.

The planarization layer 128 is formed on the passivation layer 127. The planarization layer 128 planarizes the surface of the thin film transistor substrate 120. A connection hole CH is formed in the planarization layer, through which the drain electrode 126 and the pixel electrode 129 are electrically connected.

The pixel electrode 129 is formed on the planarization layer 128. A predetermined data voltage transmitted from the drain electrode 126 is applied to the pixel electrode 129. An electric field is generated by a voltage difference between the data voltage and the common voltage applied to the common electrode 113, thereby adjusting the arrangement of the liquid crystal molecules of the liquid crystal layer 140.

The color filter substrate 110 and the thin film transistor substrate 120 are coupled by a sealing member 130. The sealing member 130 includes a pigment. For example, the sealing member may be formed using a photocurable composition including a binder resin, a crosslinking agent, a photopolymerization initiator, a pigment, and the like, and the photocurable composition may be a conventional method for forming the light blocking layer 112. Substantially the same as the photocurable composition can be used. The sealing member 130 is positioned on the peripheral area PA. As a result, the light blocking layer 112 may be positioned between the sealing member 130 and the display area DA.

Hereinafter, a method of manufacturing a liquid crystal display panel according to an embodiment of the present invention will be described with reference to the drawings and specific embodiments.

2 to 5 are process diagrams illustrating a method of manufacturing a liquid crystal display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the photocurable composition is coated on the color filter substrate 110 to form a resin layer 131. Specifically, the photocurable composition is applied to the peripheral area PA of the color filter substrate 110 to have a rectangular frame shape.

The color filter substrate 110 may include a base substrate 112, a light blocking layer 112, a color filter 113, and a common electrode 114. Since the color filter substrate 110 is substantially the same as the color filter substrate 110 of the liquid crystal display panel according to the exemplary embodiment, detailed description thereof will be omitted.

The photocurable composition may include, for example, a binder resin, a crosslinking agent, a photopolymerization initiator, a pigment, and a solvent. Specifically, the photocurable composition may include about 10 to about 30 parts by weight of the binder resin, about 10 to about 20 parts by weight of the crosslinking agent, about 1 to 10 parts by weight of the photopolymerization initiator, about 5 to 25 parts by weight of the pigment, and an extra solvent. Can be.

As the binder resin, the crosslinking agent, the photopolymerization initiator, the pigment, and the solvent, those known in the art may be used. The pigment may comprise carbon black and other black pigments. In addition, the pigment may include a pigment of various colors such as red, blue, green, etc. in addition to the black pigment, so that the photocurable composition exhibits a black color.

3 and 4, a portion of the resin layer 131 is irradiated with ultraviolet rays to form a sealing spacer pattern 132 using the mask 300. The sealing spacer pattern 132 may serve as a conventional sealing spacer, thereby maintaining an appropriate gap between the color filter substrate 110 and the thin film transistor substrate 120 in a sealing process without a conventional sealing spacer. The sealing spacer pattern 132 may have a columnar shape, and a plurality of sealing spacer patterns 132 may be disposed in the resin layer 131 at regular intervals.

The mask 300 has a light transmission pattern 310 corresponding to the sealing spacer pattern 132. For example, the light transmission pattern 310 may be a dot pattern having a substantially circular shape.

Referring to FIG. 5, the thin film transistor substrate 120 prepared in advance is in contact with the resin layer 131 and aligned to face the color filter substrate 110, and then irradiated with ultraviolet rays to the resin layer 131. The color filter substrate 110 and the thin film transistor substrate 120 are combined to form a sealing member 130.

The sealing member 130 may include a pigment to serve as a light blocking layer, and have a higher degree of curing than a conventional sealing member, thereby reducing and / or preventing contamination of the liquid crystal by an uncured material.

According to the present invention as described above, the manufacturing cost of the liquid crystal display panel can be reduced by forming the sealing member using the photocurable composition for forming the light blocking layer, which is cheaper than the photocuring composition for forming the conventional sealing member. In addition, by not using a separate sealing spacer, it is possible to prevent gaps caused by the sealing spacer and the like and to reduce costs. In addition, by increasing the degree of photocuring of the sealing member, it is possible to prevent contamination of the liquid crystal layer by the uncured material.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

Claims (9)

A thin film transistor substrate including a thin film transistor array; A color filter substrate including a color filter; A liquid crystal layer interposed between the thin film transistor substrate and the color filter substrate; And And a sealing member coupling the thin film transistor substrate to the color filter substrate and including a pigment. The liquid crystal display panel of claim 1, wherein the pigment comprises a black pigment. The liquid crystal display panel of claim 2, wherein the black pigment comprises carbon black. The liquid crystal display panel of claim 1, wherein the color filter substrate further comprises a display area and a peripheral area surrounding the display area, and further comprising a light blocking layer formed between the sealing member and the display area. Forming a resin layer by applying a photocurable composition comprising a pigment on a peripheral region of a color filter substrate including a color filter; Irradiating a portion of the resin layer with ultraviolet rays through a mask to form a sealing spacer pattern; Aligning the thin film transistor substrate including the thin film transistor substrate array to be in contact with the resin layer; And And irradiating the resin layer with ultraviolet rays to couple the color filter substrate and the thin film transistor substrate. The method of claim 5, wherein the pigment comprises a black pigment. The method of claim 5, wherein the photocurable composition further comprises a binder resin, a crosslinking agent, a photopolymerization initiator, and a solvent. The method of claim 5, wherein the forming of the sealing spacer pattern is performed using a mask including a light transmission pattern corresponding to the sealing spacer pattern. The method of claim 5, wherein the sealing spacer pattern has a columnar shape having a substantially circular cross section.

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