KR20060079982A - Color filter panel and method of manufacturing the same - Google Patents

Abstract

The present invention provides a color filter comprising a substrate, a plurality of light blocking members formed in a reverse taper shape on the substrate, a color filter formed between the light blocking members, and a common electrode formed on the light blocking member and the color filter. A display panel and a method of manufacturing the same are provided.

Light blocking member, reverse taper, light leakage, stain, display characteristics

Description

COLOR FILTER PANEL AND METHOD OF MANUFACTURING THE SAME}

1 is a cross-sectional view illustrating a color filter display panel according to an exemplary embodiment of the present invention.

2 to 6 are cross-sectional views sequentially illustrating a method of manufacturing a color filter display panel according to an exemplary embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

21: substrate 220: light blocking member layer

220a: light blocking member 230R: red color filter

230G: green color filter 230B: blue color filter

250: overcoat 270: common electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter display panel and a method for manufacturing the same, and more particularly, to a color filter display panel and a method for manufacturing the same, which can prevent a decrease in display characteristics due to light leakage caused by liquid crystal alignment.

Liquid crystal display is one of the most widely used flat panel displays, and light emitted from a light source such as a back light passes through a liquid crystal by driving a thin film transistor. A display device which performs optical display by emitting light according to a signal to a color filter.

Among the liquid crystal display devices, a field generating electrode is provided on each of two display panels. In one display panel (hereinafter, referred to as a thin film transistor display panel), a plurality of pixel electrodes are arranged in a matrix form, and a plurality of thin film transistors for switching signals to the pixel electrodes are included. ) Is provided. In addition, a display panel facing the thin film transistor array panel (hereinafter, referred to as a color filter display panel) includes a color filter of red (R), green (G), and blue (B) for expressing color, and between each color filter. A light blocking member, such as a black matrix, and a common electrode are formed to block liquid crystal light leakage in a region that is not electrically controlled.

The light blocking member formed on the color filter display panel is classified into a metal light blocking member made of chromium (Cr) or the like and an organic light blocking member made of an organic material.

The organic light shielding member has the advantage of being simple in process compared with the metal light shielding member.

However, since the organic light blocking member is formed to have a higher thickness than the metal light blocking member, both edges have an edge taper inclined at an angle with respect to the substrate. In this case, light leakage according to the liquid crystal alignment may be exposed along an end portion of the organic light blocking member in which the edge taper is formed. This is perceived as a stain from the outside, resulting in a decrease in display quality.

Therefore, this invention provides the color filter display panel which can prevent the fall of display quality, and its manufacturing method for solving the said problem.

The color filter display panel according to the present invention includes a substrate, a plurality of light blocking members formed in a reverse taper shape on the substrate, a color filter formed between the light blocking members, and a common electrode formed on the light blocking member and the color filter. It includes.

In addition, the method for manufacturing a color filter display panel according to the present invention includes the steps of forming a light blocking member layer on a substrate, photographing etching the light blocking member layer to form a light blocking member having an inverse tape shape, and a color filter between the light blocking members. And forming a common electrode on the light blocking member and the color filter.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a portion of a layer, film, region, plate, etc. is said to be "on top" of another part, this includes not only when the other part is "right over" but also when there is another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

First, a color filter display panel according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 1.

1 is a cross-sectional view illustrating a color filter display panel according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the color filter display panel according to an exemplary embodiment of the present invention includes a substrate 210 and a plurality of light blocking members 220a formed at predetermined intervals on the substrate 210.

Hereinafter, for convenience of description, the side of the light blocking member 220a in contact with the substrate 210 is referred to as a 'substrate side light blocking member', and the side facing the substrate side light blocking member and close to the liquid crystal is referred to as a 'liquid crystal side light blocking member'.

The light blocking member 220a is formed of a photosensitive organic material such as an acryl-based monomer, a photo-initiator, and carbon black.

The light blocking member 220a is formed in a reverse-tapered shape in which the liquid crystal side light blocking member has a width wider than that of the substrate side light blocking member. The light blocking member 220a having the reverse taper shape may block light in a wider area, thereby preventing display quality degradation such that light leakage due to the alignment of the liquid crystal is recognized as uneven color.

In the conventional light blocking member, since the substrate side light blocking member is formed wider than the liquid crystal side light blocking member, an inherent edge taper is formed on the substrate. The light shielding member in which such an edge taper is formed passes the liquid crystal light leakage of the area | region which is not controlled by the viewing angle as it is along the edge as it is outside. In this case, light leakage due to the alignment of the liquid crystal is perceived as unevenness, resulting in a decrease in display quality.

In the present invention, in order to overcome this problem, the liquid crystal side light blocking member is formed in an inverse taper shape having a wider width than the substrate side light blocking member. In this case, since the edge taper is not formed while blocking the light leakage caused by the alignment of the liquid crystal located in the light blocking member region with a wider width, deterioration of display quality can be prevented.

Such a reverse tapered light blocking member may be formed in various ways. For example, there is a method of reducing the amount of heat transferred to the substrate-side light blocking member rather than the liquid crystal-side light blocking member by lowering the pre-bake temperature when forming the light blocking member. Alternatively, a method of lowering the exposure dose may be used. In this case, the photo-chemical reaction occurring in the substrate-side light blocking member is reduced due to the reduction in the exposure amount transmitted to the substrate-side light blocking member, so that the substrate-side light blocking member can be formed to have a narrower width than the liquid crystal side light-shielding member. .

Alternatively, the light blocking member may be formed by adjusting a component. For example, it is possible to reduce the photochemical reaction in the substrate-side light-shielding member by increasing the content of the pigment in the light-shielding member component than the conventional to reduce the amount of light transmitted or reduce the content of the photoinitiator in the substrate-side light-shielding member.

In the same manner as described above, the light-shielding member 220a having an inverse tape shape in which the liquid crystal-side light blocking member has a wider width than the substrate-side light blocking member is formed.                     

Red, green, and blue color filters 230R, 230G, and 230B are sequentially formed on the light blocking member 220a, and a common electrode (ITO or IZO) is formed on the red, green, and blue color filters 230R, 230G, and 230B. 250 is formed on the entire surface of the substrate 210.

Next, with reference to FIGS. 2-6, the manufacturing method of the color filter display panel which concerns on this invention is demonstrated in detail.

First, as shown in FIG. 2, the light blocking member layer 220 is formed to have a thickness of 2 to 4 μm on a substrate 210 made of transparent glass or the like. The light blocking member layer 220 is formed of a photosensitive organic material including an acryl-based monomer, a photo-iniciator, and carbon black.

The light blocking member layer 220 may include different amounts of photoinitiator and / or carbon black in the substrate-side light blocking member layer and the liquid crystal-side light blocking member layer. For example, by reducing the content of the photoinitiator in the substrate-side light blocking member layer, the photo-chemical reaction by exposure in the substrate-side light blocking member layer can be reduced. Alternatively, by increasing the content of carbon black in the liquid crystal side light blocking member layer, the transmittance can be reduced to reduce the exposure amount transmitted to the substrate side light blocking member layer.

In this case, less linkage bonding is generated in the substrate-side light-shielding member layer than in the liquid crystal-side light-shielding member layer, so that it can be formed in the form of reverse taper.

Such a reverse tapered light blocking member can be formed by various methods also in the following steps. In the pre-bake step, which is the next process, precuring is carried out at a temperature lower than that of the existing precuring, for example, about 60 ° C. or lower, preferably 30 to 60 ° C., By reducing the amount of heat transferred to the substrate side light blocking member, the liquid crystal side light blocking member after exposure can be formed to have a wider width than the substrate side light blocking member.

Or in the exposure process which is a process after precuring, it exposes with the light of about 150mJ / cm <2> or less intensity | strength using a photomask. This is performed at a lower energy than when exposed under conditions of about 200 mJ / cm 2 or more. In this case, the photo-chemical reaction is reduced by reducing the exposure amount delivered to the substrate-side light blocking member. The member can be formed in a narrower width than the liquid crystal side light blocking member.

In the conventional light blocking member, since the substrate side light blocking member is formed wider than the liquid crystal side light blocking member, an inherent edge taper is formed on the substrate. According to this edge taper, the liquid crystal light leakage of the region not controlled by the viewing angle is passed through as it is. In this case, light leakage due to the alignment of the liquid crystal is perceived as unevenness, resulting in a decrease in display quality.

As described above, in the present invention, the liquid crystal side light blocking member is formed in a reverse-tapered form having a wider width than the substrate side light blocking member. The light blocking member 220a having the reverse taper shape can block light in a wider area, and unlike the conventional method, the taper does not form an edge taper, thereby preventing display quality degradation such as light leakage caused by the alignment of liquid crystals as being spotted. have.

According to the exposure process, the area exposed through the mask is formed in a hard structure by a photochemical reaction and remains through a development process to be described later, and the unexposed area is removed through the development process.

Then, a post-bake process is performed at a temperature of 100 to 110 ° C. for 30 minutes to 1 hour.

Next, development is performed using a 2.38% tetramethyl ammonium hydroxide (TMAH) solution to form a light-shielding member 220a having a reverse tapered shape as shown in FIG. 3.

Then, as shown in FIG. 4, a color filter of red (R), for example, is laminated between the light blocking members 220a and a red color filter 230R is formed by a photolithography process, and then, for example, green (G). After laminating the color filters and forming the green color filter 230G by the photolithography process, for example, the blue (B) color filters are laminated and the blue color filter 230B is sequentially formed by the photolithography process. The order of forming the color filters of red (R), green (G) and blue (B) may be changed.

Subsequently, the surface of the color filters 230R, 230G, 230B and the light blocking member 220a is irradiated with ultraviolet rays and infrared rays. At this time, the infrared surface treatment is a process of preheating before performing the ultraviolet surface treatment, at which time moisture and gaseous components remaining in the red, green, and blue color filters 230R, 230G, and 230B are removed. In addition, the ultraviolet surface treatment is performed by injecting high concentrations of ozone (O ₃ ) molecules into the ultraviolet chamber, wherein the oxygen atoms or molecules of the injected ozone are red, green and blue color filters 230R, 230G, 230B or Organic matter remaining on the surface of the light blocking member 220a is decomposed.

Subsequently, as shown in FIG. 5, an overcoat 250 for planarizing the color filters 230R, 230G, and 230B and the light blocking member 220a is formed. The overcoat 250 is made of a photosensitive photosensitive organic material.

6, a common electrode 270 made of ITO or IZO is formed on the overcoat 250 to complete the color filter display panel. At this time, the common electrode 270 is formed to a thickness of 500 to 2500Å.

Although the present invention has been described with reference to the embodiments illustrated in the accompanying drawings, it is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Accordingly, the true scope of protection of the invention should be defined by the appended claims.

As described above, since the light blocking member pattern is formed in the reverse taper shape, light leakage caused by the alignment of the liquid crystal located in the light blocking member region can be blocked in a wider width, thereby preventing the display quality from being lowered.

Claims (9)

Board, A plurality of light blocking members formed on the substrate in a reverse taper shape; A color filter formed between the light blocking members, and And a common electrode formed on the light blocking member and the color filter. The color filter display panel of claim 1, wherein the light blocking member comprises an organic material. The color filter display panel of claim 1, wherein the light blocking member comprises an acrylic monomer, a photoinitiator, and carbon black. Forming a light blocking member layer on the substrate, Photo-etching the light blocking member layer to form a light blocking member having a reverse taper shape; Forming a color filter between the light blocking members, and And forming a common electrode on the light blocking member and the color filter. The method of claim 4, wherein the forming of the light blocking member layer is formed of an acrylic monomer, a photoinitiator, and carbon black. The method of claim 4, wherein the forming of the light blocking member layer comprises controlling the content distribution of the photoinitiator differently in the substrate side light blocking member layer and the liquid crystal side light blocking member layer. The method of claim 6, wherein the forming of the light blocking member layer is performed such that the liquid crystal side light blocking member layer has a higher amount of photoinitiator than the substrate side light blocking member layer. The method of claim 4, wherein the forming of the light blocking member comprises pre-bake at about 30 to 60 ° C. 6. The method of claim 4, wherein the forming of the light blocking member includes exposing the light blocking member at an exposure amount less than 150 mJ / cm 2.

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