JPH06308478A - Color filter for liquid crystal display - Google Patents

Abstract

PURPOSE:To efficiently produce the color filter in which luminescent point is eliminated as much as possible and by which good liquid crystal display quality can be obtained by omitting the pinhole correcting work of a black matrix pattern. CONSTITUTION:The overlapped width (b) of a colored pattern layer B arranged in a state where it is overlapped on a black matrix pattern layer 2 on a color filter substrate 1 is wider than the overlapped widths (g), and (r) of other colored pattern layers G and R arranged in a state where they are overlapped on the black matrix pattern layer 2, and a colored layer B1 is provided inside a space 2a on the black matrix pattern layer 2 obtained by making both end of colored pattern layers G and R distantly opposed each other and overlapped.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As shown in FIG. 2, a color filter for liquid crystal display, which is used by being installed in a liquid crystal color display device, is
A black matrix pattern layer 2 and a filter color pattern layer 3 are formed on a transparent filter substrate 1 such as a glass substrate by a dyeing method, a pigment dispersion method, a printing method or the like. The filter color pattern layer 3 is Blue
It is formed by regularly arranging three colored patterns of a blue (blue) colored pattern B, a green (green) colored pattern G, and a red (red) colored pattern R, and to enhance the liquid crystal display contrast. In addition, along the boundary portion between the colored patterns B, G, and R of the filter color pattern layers 3, the width a is appropriately equalized so as to overlap.
The black matrix pattern layers 2 of parallel lines, lattice pattern, mesh pattern, and the like, which are arranged at regular regular intervals, are formed as light-shielding layers.

Generally, each colored pattern B constituting each filter color pattern layer 3 with respect to a so-called black matrix pattern layer 2 which is a light shielding layer of a conventional color filter,
The overlapping width o of G and R is set so that about 1/4 of the width a of the black matrix pattern layer 2 is overlapped.

[0004]

The black matrix pattern layer 2 of the color filter for the above liquid crystal display device.
Is formed as a thin film on the filter substrate 1, and in the black matrix pattern layer 2, fine pinholes (hole-shaped light-shielding missing portions) of micron order may occur in the manufacturing stage of the color filter. Yes,
For example, in the case of a TFT-CF (color filter used in a TFT type liquid crystal display device using a thin film transistor on the opposite electrode side as a display driving switching element for each liquid crystal display matrix), its black matrix pattern layer 2 (light shielding layer) is used. ) Has a small pinhole of several μm or less, malfunction may occur in the liquid crystal display device,
The quality of the displayed image easily deteriorates.

Further, the TFT array liquid crystal display operation TF of the TFT array in which the pinholes generated in the black matrix pattern layer 2 on the filter substrate are arranged so as to face the pinholes.
Even if it occurs in a portion that is out of position with respect to the formation region of T (switching thin film transistor), the pinhole impairs the light-shielding effect and the liquid crystal display contrast. In the (positive type display part), it may become a bright spot to deteriorate the display quality.

At present, the pinhole forms a black matrix pattern layer 2 on a filter substrate 1 as shown in FIG. 2, and a filter color composed of B, G, and R coloring patterns is formed on the black matrix pattern layer 2. After forming the pattern layer 3, the inspection and marking work of the pinhole generation portion of the black matrix pattern layer 2 and the pinhole portion where the pinhole generation portion is color-corrected by using the blue (blue) pigment dispersion paint Since the color correction work, the heating and solidifying work of the correction paint, and the cleaning work are carried out, the correction requires skill, time, and labor.

It is an object of the present invention to efficiently manufacture a color filter having a good liquid crystal display quality without a bright spot by omitting the work of correcting a pinhole.

[0008]

According to the present invention, there is provided a black matrix pattern layer 2 on a color filter substrate 1 and blue, green and red colored patterns whose ends overlap with the pattern layer 2, respectively. In the color filter for liquid crystal display in which the filter color pattern layer 3 including the layers B, G and R is arranged, the overlap width b of the blue colored pattern layer B overlapped and arranged on the black matrix pattern layer 2 Is wider than the overlapping widths g and r of the other green and red colored pattern layers G and R arranged so as to overlap each other on the black matrix pattern layer 2, and the end portions of both colored pattern layers G and R are overlapped. A black matrix pattern layer 2 in which the
A color filter for liquid crystal display, characterized in that a blue colored layer B ₁ is provided in the upper facing gap 2a.

[0009]

In the color filter for liquid crystal display of the present invention, the overlapping width b of the blue colored pattern layer B arranged on the black matrix pattern layer 2 on the filter substrate 1 is changed to other Green and Red.
Is set to be larger than the overlapping widths g and r of the colored pattern layers G and R, and the overlapping width Bl is set to be larger than that of the black matrix pattern layer 2.
The ue colored pattern layer 3 is a blue pigment (dye) that is on the shorter wavelength side and has a lower specific visual sensitivity than the hues of Green and Red, and thereby has the effect of making fine pinholes less visible. The pinhole generated in the black matrix pattern layer 2 in the region of the large overlap width b can be inconspicuously corrected.

Further, the facing gap 2a on the black matrix pattern layer 2 in which the ends of the green and red colored pattern layers G and R are opposed to each other and overlap each other.
A colored layer B ₁ is provided which contains blue or a blue-based pigment (dye), which is on the short wavelength side and has a low relative visual sensitivity and which makes fine pinholes less noticeable. Therefore, most of the black matrix pattern layer 2 in the color filter including the area of the overlap width b that is set to a large size has a colored pattern including the upper side thereof with Blue or a Blue-based pigment (dye). Since it is covered with the layer B and the coloring layer B ₁ , most pinholes generated in the black matrix of the color filter can be corrected inconspicuously.

[0011]

EXAMPLES The color filter for liquid crystal display of the present invention will be described in detail below with reference to the examples. FIG. 1 shows one example of the color filter of the present invention, which is formed on a transparent filter substrate 1 such as glass. , The black matrix pattern layer 2 having a width a is regularly formed at equal intervals (a + t).

In one embodiment, the width a of the black matrix pattern layer 2 is about a = 20 μm-7.
It is set to any of the ranges of 0 μm.

The intervals t between the black matrix pattern layers 2 arranged at equal intervals (the intervals between the inner ends of the pattern layers 2 facing each other) are about t = 20 μm.
It is set to any of the ranges of 100 μm.

The black matrix pattern layer 2 has a stripe pattern in which a large number of parallel linear stripes are regularly arranged, a grid pattern in which a large number of parallel linear stripe patterns are regularly arranged in the vertical and horizontal directions, or a regular pattern. There is an appropriate mesh pattern or the like.

On the flack matrix pattern layer 2,
Blue, Green, Red colored pattern layers B,
A filter color pattern layer 3 composed of G and R is applied and laminated, and each of the color pattern layers B, G, and
The Rs are aligned and arranged so as to overlap the black matrix pattern layer 2.

The color filter in the present invention is shown in FIG.
As shown in FIG. 7, the overlap width b between the blue colored pattern layer B and the black matrix pattern layer 2 is at least the overlap width g between the green colored pattern layer G and the black matrix pattern layer 2, and Re.
Coloring pattern layer R of d and black matrix pattern 2
B> g and b> r with respect to the overlap width r of

The overlap width g of the green colored pattern layer G and the black matrix pattern layer 2 is
And the overlapping width r between the red colored pattern layer R and the black matrix pattern layer 2 is g = r
Or it is suitable that g≈r.

In one embodiment of the invention, Green
Width g of the colored pattern layer G of
The overlapping width r of the colored pattern layer R of 3 μm to
It is suitable to be set to about 5 μm, but the invention is not limited to this.

Further, as shown in FIG. 1, the color filter according to the embodiment of the present invention has the following coloring patterns B,
A gap d is appropriately provided between G and R so that they do not overlap each other, and it is appropriate that d = 3 μm to 5 μm or less is set, but of course d = 0 μ
It may be m.

As shown in FIG. 1, the color filter according to one embodiment of the present invention is a black matrix pattern layer in which the end portions of both green and red colored pattern layers G and R are spaced apart from each other and overlap each other. 2 in the facing gap 2a on the short wavelength side (about 400 nm to 500 n).
m range), which has a relatively low relative visual sensitivity to Green and Red, and which has an effect of making fine pinholes less noticeable, or a blue coloring material for forming the blue coloring pattern B, or The coloring layer B ₁ is formed using a coating material containing a blue-based coloring material (dye, pigment, coating material, ink).

The width of the facing gap 2a is, of course, the pattern width a of the black matrix pattern layer 2 and the black matrix pattern layers of the green and red colored pattern layers G and R, which are adjacent to each other. It is determined by the overlap widths g and r for 2.

Further, the color filter for liquid crystal display of the present invention comprises the black matrix pattern layer 2 and the filter color pattern layer 3 on the filter substrate 1, but within a range not departing from the gist of the present invention. On the black matrix pattern layer 2 and the filter color pattern layer 3, a transparent protective film for appropriately protecting the filter color pattern layer 3 or a transparent conductive film (transparent electrode film such as ITO film) as a counter electrode may be provided. It is possible.

In the color filter for liquid crystal display of the present invention, when the black matrix pattern layer 2, the filter color pattern layer 3 and the like are patterned on the filter substrate 1, a well-known appropriate precision pattern forming method is used. A known color filter pattern forming method (a dyeing method, a pigment dispersion method, a printing method, etc.) that can be performed using a photolithography method, a photo-etching method using a photoresist or an etchant, a dyeing method, an intaglio offset printing method, etc. ).

[0024]

EFFECT OF THE INVENTION The color filter for liquid crystal display of the present invention is a microscopic pinhole which is generated in a black matrix pattern layer (light-shielding layer) formed in a thin film on a filter substrate at the manufacturing stage of the color filter. The (hole-shaped light-shielding missing portion) overlaps the colored pattern layer of Blue, which has a large overlap width with the black matrix pattern layer, and the end portions of both the colored pattern layers of Green and Red, which are separated from each other and face each other. Most pinholes generated in the black matrix of the color filter can be inconspicuously corrected by the coloring layer formed by using the paint containing the blue pigment in the facing gap on the black matrix pattern layer. , Normal liquid crystal color filters and T
Even if the black matrix pattern layer of the FT type color filter has minute pinholes of several μm or less, it is possible to prevent malfunction of the liquid crystal display device and deterioration of the quality of the displayed image. To prevent the occurrence of bright spots on the black display (positive display),
It has the effect of improving the display quality.

In addition, the conventional inspection and marking work of the pinhole occurrence place after forming the filter color pattern layer, the pinhole occurrence place is manually colored by using a pigment dispersion paint of Blue (blue) It is possible to save labor in the correction process such as the color placement work on the pinhole portion, the heat solidification work of the correction paint, and the cleaning work, and it is possible to efficiently manufacture the color filter having a good liquid crystal display quality.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of a liquid crystal display color filter of the present invention.

FIG. 2 is a side sectional view of a conventional color filter for liquid crystal display.

[Explanation of symbols]

1 ... Filter Substrate 2 ... Black Matrix Pattern Layer 2a ... Opposing Gap 3 ... Filter Color Pattern Layer B ... Blue Coloring Pattern Layer G ... Green Coloring Pattern Layer R ... Red Coloring Pattern Layer a ... Black Matrix Pattern Pattern Width b ... Blue color pattern layer overlap width g ... Green color pattern layer overlap width r ... Red color pattern layer overlap width d ... Gap t ... Black matrix pattern inner facing space

Claims (1)

[Claims] 1. A black matrix pattern layer 2 on a color filter substrate 1, and blue, green, and so on that end portions thereof overlap the pattern layer 2.
In the color filter for liquid crystal display, in which the red color pattern layers B, G and R and the filter color pattern layer 3 are arranged, the blue color pattern layer B overlapped on the black matrix pattern layer 2 is formed. Another green having an overlap width b overlapped on the black matrix pattern layer 2
The overlapping widths g and r of the colored pattern layers G and R of n and Red are wider, and the end portions of the colored pattern layers G and R are opposed to each other on the black matrix pattern layer 2 so as to face each other and overlap each other. A color filter for liquid crystal display, characterized in that a blue colored layer B ₁ is applied in the gap 2a.