JP2001337220A - Color filter for liquid crystal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter for a liquid crystal preventing haze generation on a transparent electrode. SOLUTION: In the color filter for the liquid crystal provided with a transparent substrate 2, a light shielding mask 3 formed on a surface of the transparent substrate, a translucent film 4 formed on a light transmissive opening part of the light shielding mask and transparent electrodes 5 formed on their surfaces, the color filter is characterized by being provided with narrow pores 7 going through the transparent electrodes 5 in the film thickness direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, a color liquid crystal display device has been known as a kind of display device for displaying various images such as characters and figures. In such a color liquid crystal display device, a combination of a backlight and a color filter for liquid crystal is generally used because colorization can be relatively easily realized.

In a color filter for liquid crystal used in a color liquid crystal display device, a light-shielding mask called a black matrix is formed on a surface of a transparent substrate formed of, for example, transparent glass. The light-shielding mask includes a light-shielding portion and a plurality of light-transmitting openings provided in a predetermined pattern at predetermined positions of the light-shielding portion. A display section is formed by these light transmitting openings, and the shape of the display section is set according to the use such as time display and speed display. In each light transmitting portion, a light transmitting film colored red, green, and blue, which becomes red (R), green (G), and blue (B) pixels formed with a colored resist, is formed. .
Further, a transparent electrode made of indium tin oxide (ITO) or the like is directly formed in a predetermined pattern on the surface of the light-shielding mask and each light-transmitting film.

[0004]

By the way, in the above-mentioned conventional color filter for liquid crystal, at least in the lower layer of the transparent electrode, due to the heat history after the formation of the transparent electrode in the manufacturing process. The unreacted components of the colored resist forming the light transmitting film are released to the outside as a decomposition gas. At this time, since the transparent electrode hardly transmits the decomposition gas, the interface between the transparent electrode and the light transmitting film is
The stress of the decomposition gas is concentrated, and the transparent electrode is distorted or the transparent electrode is separated from the light transmitting film. In addition, haze is caused by the difference in thermal expansion coefficient between the transparent electrode and the light-transmitting film.
In some cases, thermal stress is applied to the interface between the transparent electrode and the light transmitting film, and the transparent electrode peels off from the light transmitting film.

[0005] This haze is likely to occur in a large area of a transparent electrode patterned into a predetermined shape, or in a portion where a transparent electrode is formed on a colored resist having a small amount of a pigment component.
This is more noticeable as the thickness of the colored resist is larger.

Further, when haze is generated in the transparent electrode, there is a problem that the transparent electrode is disconnected due to stress.

[0007] The present invention has been made in view of the above points, and has as its object to provide a color filter for liquid crystal that can prevent haze from occurring in a transparent electrode.

[0008]

In order to achieve the above-mentioned object, a feature of the color filter for liquid crystal according to the present invention according to the first aspect is that a transparent electrode is provided with pores penetrating in the film thickness direction. . And, by adopting such a configuration, since the transparent electrode has pores, the pores serve as a passage when the decomposition gas generated due to the heat history after forming the transparent electrode goes out. Therefore, the stress of the decomposed gas concentrated on the interface between the transparent electrode and the light transmitting film can be reduced. Therefore, haze can be easily prevented from occurring, and disconnection of the transparent electrode caused by the haze can be reliably prevented.

A feature of the color filter for a liquid crystal of the present invention according to claim 2 is that, in claim 1, the pores are formed in a slot shape. By adopting such a configuration, the area of the pores can be easily increased, and the thermal stress caused by the difference in thermal expansion coefficient between the transparent electrode and the light transmitting film can be appropriately buffered. it can. Here, the slot-shaped pores are elongated holes whose periphery is surrounded by a transparent electrode, whereby the transparent electrodes separated by the slot-shaped pores are in a parallel state, and the resistance of the transparent electrode increases. Can be minimized.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

1 to 3 show an embodiment of a color filter for a liquid crystal according to the present invention. FIG. 1 is a schematic structural view of a main part, and FIG. 2 is an explanatory view showing an example of a display pattern of a display part. FIG. 3 is an enlarged explanatory view showing an example of the pores of the transparent electrode.

As shown in FIG. 1, a color filter 1 for a liquid crystal according to the present embodiment has a black substrate formed of a black colored resist (photoresist) on a surface of a transparent substrate 2 formed of transparent glass or the like. A light-shielding mask 3 called a mask or a black matrix;
Light transmitting films 4R, 4G, 4 made of three blue colored resists
B is formed, and a transparent electrode 5 made of indium tin oxide (ITO) or the like is directly formed on these surfaces.

The light-shielding mask 3 is formed of a light-transmitting film 4 (reference numeral 4).
Are light-transmitting films 4R, 4G, and 4B of three colors of red, green, and blue) and a light-shielding portion 3a that shields a gap between the light-transmitting films 4R, 4G, and 4B. And a plurality of light transmission openings 3b. The display section 6 having a predetermined shape is formed by the light transmitting openings 3b. The display pattern of the display unit 6 is partially divided into a plurality of parts. For example, as shown in FIG. 2, when a desired numerical value is displayed, a display unit serving as a lighting unit provided for transmitted light display is provided. A portion 6a and a non-display portion 6b serving as a non-lighting portion that blocks transmitted light can be formed.
Note that the shape of the display unit 6 is set according to the use such as time display and speed display.

Returning to FIG. 1, each of the light transmitting films 4 is made of R
(Red), G (Green), and B (Blue) pixels are formed of three color resists of red, green, and blue, and are formed in the light transmitting openings 3b of the light-shielding mask 3 constituting the display unit 6. They are arranged in a predetermined pattern. The pattern arrangement of each light-transmitting film 4 composed of the three colored resists is selected from a variety of pattern arrangements such as a mosaic type, a triangle type, a stripe type, and a four-pixel arrangement type as required according to a design concept or the like. Used. Further, as the colored resist for forming each light transmitting film 4, a photosensitive resin (photoresist) or a non-photosensitive resin is selected and used as required according to a design concept or the like. Here, the light transmitting film 4 is red
Although illustrated as colored resists of three colors of green and blue, any film may be used as long as the film transmits light, and a transparent film may be used regardless of hue.

As shown in FIG. 3, the transparent electrode 5 has a plurality of pores 7 penetrating in the thickness direction. In the present embodiment, the pores 7 are used to connect a portion where the area of the transparent electrode 5 is large, more specifically, a connection between the display side connection portion 5a of the transparent electrode 5 connected to the display unit 6 and the outside. The routing portion 2c having a line width of the transparent electrode 5 of 100 μm or more in the routing portion 5 located between the connection terminal forming portion 5b serving as the connection terminal 8 is provided. Further, each of the fine holes 7 in the present embodiment is formed in a slot shape having a width of 50 μm, and these fine holes 7 are arranged at a pitch of 50 μm.

The shape of the pores 3 may be selected from a variety of shapes such as a circle, an ellipse, and a triangle, depending on the shape of the site where the pores 3 are formed. The area can be easily increased, the thermal stress at the interface caused by the difference in the thermal expansion coefficient between the transparent electrode 5 and the light transmitting film 4 can be appropriately buffered, and the propagation of defects such as disconnection of the transparent electrode 5 can be prevented. It is preferable that the shape is a slot shape (slit shape) from the viewpoint that it can be performed. The width of the pores 7 is preferably 5 μm or more in order to accurately penetrate the transparent electrode 5 in the film thickness direction, and is preferably 75 μm or less in order to prevent an increase in the resistance value of the transparent electrode 5.

On the surface of the transparent electrode 5, an alignment film (not shown) made of a polymer material such as polyimide for arranging liquid crystal molecules in a predetermined form is provided.

Next, the operation of the present embodiment having the above-described configuration will be described.

According to the color filter 1 for a liquid crystal of the present embodiment, the transparent electrode 5 has the pores 7 penetrating in the film thickness direction. Gas, the unreacted portion of the colored resist in the light-shielding mask 3 and the light-transmitting film 4 in the present embodiment acts as a passage when going outside, so that the interface between the transparent electrode 5 and the light-transmitting film 4 The stress of the decomposed gas concentrated on the substrate can be reduced.

Therefore, according to the liquid crystal color filter 1 of the present embodiment, haze can be easily prevented from occurring, and disconnection of the transparent electrode 5 caused by the haze can be reliably prevented. it can.

Further, according to the color filter 1 for a liquid crystal of the present embodiment, since the pores 7 are formed in a slot shape, the area of the pores 7 can be easily enlarged. That is, since the area of the passage through which the decomposition gas passes can be easily increased, the stress of the decomposition gas concentrated on the interface between the transparent electrode 5 and the light transmitting film 4 and the thermal stress generated by the difference in the thermal expansion coefficient are further reduced. It can be small.

In the display section 6 of the present embodiment, a light-shielding mask 3 is provided between the transparent electrode 5 and the transparent substrate 2.
Since only one layer of the light-transmitting film 4 is provided, haze hardly occurs even when the area is large. Therefore, by forming the pores 7 in the routing portion 5c of the transparent electrode 5, the generation level of haze can be easily and reliably reduced to a level having no practical problem.

The present invention is not limited to the above embodiment, but can be variously modified as needed.

[0024]

As described above, according to the color filter for liquid crystal of the present invention according to the first aspect, since the transparent electrode has pores, the pores have a thermal history after forming the transparent electrode. Acts as a passage for the decomposed gas generated to the outside to escape to the outside, so that the stress of the decomposed gas concentrated on the interface between the transparent electrode and the light transmitting film can be reduced. Therefore, it is possible to easily prevent the occurrence of haze, and to achieve an extremely excellent effect that the disconnection of the transparent electrode caused by the haze can be reliably prevented.

Further, according to the color filter for liquid crystal of the present invention according to the second aspect, the area of the pores can be easily increased, and it is caused by the difference in the thermal expansion coefficient between the transparent electrode and the light transmitting film. An extremely excellent effect such as the ability to buffer the thermal stress at the interface is achieved.

[Brief description of the drawings]

FIG. 1 is a schematic structural view of a main part of an embodiment of a liquid crystal color filter according to the present invention.

FIG. 2 is an explanatory diagram showing an example of a display pattern of a display unit of the color filter shown in FIG.

FIG. 3 is an enlarged explanatory view showing an example of pores of a transparent electrode of the color filter shown in FIG.

[Explanation of symbols]

 Reference Signs List 1 color filter for liquid crystal 2 transparent substrate 3 light-shielding mask 3a light-shielding part 3b light-transmitting opening 4 light-transmitting film 4R (red) light-transmitting film 4G (green) light-transmitting film 4B (blue) light-transmitting film 5 transparent electrode 5a display side connection part 5b connection terminal formation part 5c routing part 6 display part 6a display part 6b non-display part 7 pore 8 connection terminal

Continuation of the front page (72) Inventor Masayuki Kato 5-7-18 Higashi-Nippori, Arakawa-ku, Tokyo Optrex Corporation F-term (reference) 2H048 BA11 BA43 BA45 BA48 BB01 BB08 BB44 2H091 FA02Y FA34Y FA41Z LA20 5G435 AA07 AA16 BB12 CC12 FF13 GG12 HH12 HH14

Claims (2)

[Claims] 1. A transparent substrate, a light-shielding mask formed on a surface of the transparent substrate, a light-transmitting film formed on a light-transmitting opening of the light-shielding mask, and a transparent electrode formed on these surfaces. A color filter for liquid crystal, comprising: a transparent electrode provided with pores penetrating in a thickness direction. 2. The liquid crystal color filter according to claim 1, wherein the pores are formed in a slot shape.