JP2009229801A - Liquid crystal panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a color filter from chipping or peeling by improving the adhesive strength of a color filter of a liquid crystal panel, and to make it easy to set conditions of spinning being a manufacturing step of the color filter. <P>SOLUTION: The liquid crystal panel includes a transparent substrate 11, a black matrix 12 formed on the transparent substrate 11 to have vacant portions, and color filters 14, a transparent resin layer 13 being provided at the vacant portions of the black matrix 12 between the transparent substrate 11 and color filters 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal panel having a color filter.

Conventionally, liquid crystal panels are characterized by light weight, thinness, and low power consumption, and are used in many electronic devices. The liquid crystal panel is divided into horizontal gate lines (scanning lines) and vertical source lines (data lines), and has sub-pixels arranged in a matrix. Usually, R (red) and G (
One pixel is constituted by three sub-pixels of green) and B (blue), and color mixing is performed by adjusting the luminance of each sub-pixel.

The liquid crystal panel includes a liquid crystal layer having a liquid crystal element, an array substrate that changes brightness by changing the orientation of the liquid crystal element located below the liquid crystal layer, and a color filter substrate that is colored above the liquid crystal layer. Have Usually, as shown in FIG. 4, the color filter substrate 5 has a black matrix 12 formed on a transparent substrate 11 such as glass. The black matrix 12 is a light shielding material made of metal or resin, and shields the gate line, the source line, and the TFT element portion, and the display area becomes an empty portion to allow the passage of light. R, G and B color filters 51 are formed so as to cover the black matrix 12 (see FIG. 2 of Patent Document 1). The color filter 51 is formed by applying a photosensitive color resist of one color so as to cover the black matrix 12, and spinning (rotating) it to make the thickness uniform, and exposing the area where the color filter 51 is unnecessary,
The part exposed by development is removed. This process is performed in three colors of R, G, and B.
JP-A-8-43621

However, in the conventional color filter forming method, the color filter in the display region is bonded to a transparent substrate such as a glass substrate. The transparent substrate has a mirror surface, and since there are few irregularities when viewed at the microscope level, the adhesive area with the color filter is small and the adhesive force is weak. Further, when the transparent substrate is made of glass, an organic material (acrylic resin, epoxy resin, etc.) color filter is bonded to the glass of an inorganic material, so that the adhesive force due to intermolecular bonding is weak. For this reason, there is a problem that the color filter is chipped or peeled off.

In addition, for the spin to make the thickness uniform, it is necessary for each color to set the optimum rotation speed and time for each of the rising step, holding step, and falling step, but the black matrix wall is an obstacle. Thus, there is a problem that it is difficult to set an optimum condition with less film thickness unevenness and less radiation unevenness.

The present invention has been made in view of such problems, and improves the adhesive strength of the color filter,
It prevents chipping or peeling. Further, it is intended to facilitate the setting of spin conditions, which is a color filter manufacturing process.

In order to solve the above problems, a liquid crystal panel of the present invention is a liquid crystal panel having a transparent substrate, a black matrix formed with a void on the transparent substrate, and a color filter,
A transparent resin layer is provided between the transparent substrate and the color filter in the empty space of the black matrix.

As a result, the color filter is bonded to a transparent resin having irregularities on the surface as compared with a mirror-like transparent substrate, so that the substantial bonding area is widened and the bonding strength is high. Further, since both are materials having an adhesive force to the transparent substrate, the adhesive force due to intermolecular bonding is high. As described above, since the adhesive strength is increased, the color filter can be prevented from being chipped or peeled off. In addition, since the unevenness of the adhesion surface of the color filter is reduced, it is easy to set the spin condition, which is the color filter manufacturing process.

  The transparent resin layer is formed to cover the black matrix.

As a result, the color filter adheres to the transparent resin without adhering to the black matrix, thereby increasing the adhesive strength. In addition, since the transparent resin in the display area is formed over all the sub-pixels, the transparent resin is also difficult to peel off.

The black matrix is made of a resin material. Since the thickness of the black matrix is larger in the resin material than in the metal material, the effect of the present invention is great.

Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below exemplifies a liquid crystal panel for embodying the technical idea of the present invention, and is not intended to specify the present invention to this liquid crystal panel. Other embodiments within the scope are equally applicable.

The liquid crystal panel is divided into horizontal gate lines (scanning lines) and vertical source lines (data lines), and has sub-pixels (not shown) arranged in a matrix. Usually, R (red) and G (green)
A single pixel is composed of three B (blue) sub-pixels, and color mixing is performed by adjusting the luminance of each sub-pixel.

The liquid crystal panel includes a liquid crystal layer (not shown) having a liquid crystal element, an array substrate (not shown) that is located below the liquid crystal layer and changes the luminance by changing the orientation of the liquid crystal element, and an upper part of the liquid crystal layer. And a color filter substrate 1 that performs coloration. FIG. 1 is a cross-sectional view showing a main part of the color filter substrate 1 in the first embodiment. A black matrix 12 is formed on a transparent substrate 11 such as glass (FIG. 2B). This black matrix 12 is a light shielding material such as metal or resin, and includes a gate line (not shown), a source line (not shown), and a TFT element portion (not shown).
(Not shown) is shielded, and the display area becomes empty to allow the passage of light. A transparent resin layer 13 is filled in the empty space of the black matrix 12 so as to be flush with the black matrix 12 (FIG. 2).
(C)). The material of the transparent resin layer 13 is a colorless and transparent resin containing no pigment,
Made of acrylic resin or epoxy resin. The black matrix 12 and the transparent resin layer 1
The color filter 14 is formed so as to be superimposed on 3 (FIG. 2D).

A method for forming the color filter 14 will be described in detail. The surface of the formed transparent resin layer 13 is washed and dried, and a G (green) color resist is applied. Spin to make the thickness uniform. The rotation speed and time of the rising step, holding step, and falling step are set for each color so that the spin has less film thickness unevenness and radiation unevenness. After drying, an area where the color filter is unnecessary is exposed. The part exposed by development is removed. Next, color filters are similarly formed in the order of B (blue) and R (red).

As described above, the present invention provides a transparent resin layer between the transparent substrate and the color filter.
Compared with the conventional case, the substantial bonding area is increased and the bonding strength is increased. Further, since both are materials having an adhesive force to the transparent substrate, the adhesive force due to intermolecular bonding is increased. As described above, since the adhesive strength is increased, the color filter can be prevented from being chipped or peeled off. In addition, since the unevenness of the adhesion surface of the color filter is reduced, it is easy to set the spin condition, which is the color filter manufacturing process. If the black matrix 12 is made of a resin instead of a metal, the height of the black matrix 12 is increased, so that the effect of the ease of setting the spin condition compared to the conventional case is increased.

FIG. 3 is a cross-sectional view showing the main part of the color filter substrate 1 ′ according to the second embodiment of the present invention. The configuration of the second embodiment that is the same as the configuration of the first embodiment is denoted by the same reference numeral and description thereof is omitted. As shown in FIG. 3, the transparent resin layer 13 ′ of Example 2 is formed so as to cover the black matrix 12.
A color filter 14 ′ is formed on the transparent resin layer 13 ′. Therefore, in Example 2, the transparent resin layers 13 ′ of all the sub-pixels are connected, and the color filter 14 ′ is not bonded to the black matrix 12.

In this way, the color filter 14 'adheres to the transparent resin without adhering to the black matrix 12, so that the adhesive strength is increased. In addition, since the transparent resin in the display area is formed over all the sub-pixels, the transparent resin is also difficult to peel off.

It is sectional drawing which shows the principal part of the color filter substrate of Example 1 of this invention. FIG. 4 is a diagram illustrating a manufacturing process of the color filter substrate of Example 1. It is sectional drawing which shows the principal part of the color filter substrate of Example 2 of this invention. It is sectional drawing which shows the principal part of the conventional color filter substrate.

Explanation of symbols

1, 1 'color filter substrate 11 transparent substrate 12 black matrix 13, 13' transparent resin layer 14, 14 'color filter

Claims (3)

A liquid crystal panel having a transparent substrate, a black matrix formed with a void on the transparent substrate, and a color filter,
A liquid crystal panel, wherein a transparent resin layer is provided between the transparent substrate and the color filter in an empty portion of the black matrix. The liquid crystal panel according to claim 1, wherein the transparent resin layer is formed to cover the black matrix. The liquid crystal panel according to claim 1, wherein the black matrix is formed of a resin material.

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