JP3274283B2 - Color filter for liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter incorporated in a color liquid crystal display.

[0002]

2. Description of the Related Art A problem demanded of a color liquid crystal display device is to pursue higher luminance and lower power consumption by increasing the aperture ratio of pixels. As one of the measures,
There is a method of forming a black matrix on a thin film transistor (hereinafter referred to as TFT) substrate side. According to this,
Unlike the related art, there is no need to provide an alignment margin in the black matrix portion in consideration of a bonding error between the TFT substrate and the color filter substrate on which the black matrix is formed, which contributes to increasing the aperture ratio.

Conventionally, marks such as alignment marks formed on a color filter substrate are formed of a chromium film used for a black matrix.
The mark pattern shape (linearity) was good, and bonding at the time of cell formation was easy. However, when a black matrix is formed on the TFT substrate side, it is necessary to form a mark using any of red, green, and blue color filters on the color filter substrate side. For example, when the first color red is applied, as shown in FIG. 2, a mark 3 having an inferior shape such as a fringe 5 is formed by halation or the like from the glass because the mark 3 is formed directly on the elementary glass. Alignment errors tend to occur, which is a problem.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems, and has been developed to provide a color filter having a mark shape having a good mark shape and having no alignment error at the time of cell formation and having no black matrix. The purpose is to provide.

[0005]

That SUMMARY OF THE INVENTION The present invention is, blanking
A thin-film transistor substrate with a rack matrix
Color filter board without rack matrix
When manufacturing a color liquid crystal display device by bonding
In a color filter substrate, an alignment mark used for bonding both substrates in the cell forming process is formed in the alignment mark forming portion in a base previously formed in red and in a shape such as a square or a circle larger than the size of the alignment mark. on the pattern, a color filter for a liquid crystal display device characterized by comprising forming a purple marks by laminating subtractive mixing pattern of the mark shape at blue. More specifically, a base pattern such as a square or a circle larger than the size of the mark is previously colored in red on the alignment mark forming portion for bonding in the cell forming process on the color filter glass substrate. It is formed together with the pattern of the part. Next, a pattern of a color filter portion is formed in green, and finally, in blue, an alignment mark pattern is formed by laminating the pattern of the color filter portion on the base pattern of the red film.

[0006]

With the above structure, the red resist in the lower layer absorbs the short-wavelength region up to around 500 nm. A good mark pattern is obtained.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below step by step. Each color filter made of a pigment-dispersed resist is formed on a glass substrate by photolithography. First, a red resist (trade name “CR-200” manufactured by Fuji Hunt Co.)
0 ”), spin-coat the entire surface to a thickness of 1.0 to 2.0 μm, and perform pre-baking at 70 ° C. for 20 minutes. Next, exposure is performed at 120 mJ / cm ² through a photomask, the resist is developed using a dedicated developer, and post-baking is performed at 230 ° C. for 60 minutes.

[0008] Here in the photo mask for the red (hereafter referred to as "red version") on the, and the pattern for color matching mark 2 shown in FIG. 1 for a later time to match the green version and blue version, A square or circular pattern 4 which is sufficiently larger than the mark 3 is formed in an area where the mark 3 necessary for assembling the TFT device is to be formed. The pattern 4 may have any shape as long as it is larger than the size of the mark 3.

Next, a green plate pattern is similarly formed using a green resist (trade name “CG-2000” manufactured by Fuji Hunt Co.). Finally, a blue resist pattern is similarly formed using a blue resist (trade name “CB-2000” manufactured by Fuji Hunt Company). Here, the pattern for the mark 3 necessary for assembling the TFT device is formed on the blue resist. The mark 3 is formed on the pattern 4 previously formed of a red resist as shown in FIG.

[0010] In the step of bonding to the TFT substrate by using the color filter thus formed and forming a cell, an alignment error does not occur because the mark shape is good, and a liquid crystal cell with high accuracy is obtained.

[0011]

According to the above color filter,
Even in the color filter substrate having no black matrix, a good pattern can be obtained shape, yet the alignment at the time of cell assembling order mark purple is obtained becomes easy by subtractive color mixing of the red and blue, the accuracy well,
Error-free alignment is possible.

[0012]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing one embodiment of an alignment mark used for a color filter of the present invention.

FIG. 2 is an explanatory view showing an example of a conventional alignment mark.

[Explanation of symbols]

 1 Glass substrate 2 Color matching mark 3 Mark 4 Pattern 5 Fringe

Claims (1)

(57) [Claims] 1. A thin film transistor having a black matrix formed thereon.
Color board without the register substrate and black matrix
To form a color liquid crystal display device.
In the color filter substrate at the time of manufacturing, the alignment mark used at the time of bonding the two substrates in the cell forming step has a shape such as a square or a circle which is larger than the size of the alignment mark in red in advance in the alignment mark forming portion. A color filter for a liquid crystal display device, comprising: a blue mark-shaped pattern laminated on a base pattern formed on the base pattern formed as described above to form a purple mark by subtractive color mixing.