JPH06273743A - Color liquid crystal electrooptic device - Google Patents

Abstract

PURPOSE:To improve the cell gap uniformity in a seal part and a display part by providing the seal part, of a color liquid crystal cell with a black matrix layer, too. CONSTITUTION:A transparent electrode 3 patterned into a prescribed shape is arranged on a glass substrate 1, and red, green, and blue color filter layers 2R, 2G, and 2B are successively and repeatedly formed on this electrode 3 by the electrodeposition method. Spaces among color filter layers and the seal part are provided with black matrix layers 4 and 12, respectively. A top coat layer 5 is provided on color filter layers 2R, 2G, and 2B and black matrix layers 4 and 12, and a patterned transparent electrode 6 is provided on this layer 5. Meanwhile, a transparent electrode 8 patterned into a prescribed shape is arranged on the other glass substrate 7 facing the glass substrate 1, and liquid crystal 10 is enclosed and hermetically sealed by a seal part 9 provided in the outer peripheral parts of two glass substrates 1 and 7.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color liquid crystal electro-optical device used in personal computers, pocket televisions and the like. FIG. 2 is a schematic sectional view of a conventional color liquid crystal electro-optical device. (A) and (b) are drawn by changing the cut surface by 90 degrees. In the configuration of the color liquid crystal electro-optical device of this conventional example, a transparent electrode 3 patterned in a predetermined shape is arranged on a glass substrate 1 which is a transparent substrate, and red, green and blue color filters are provided on the transparent electrode 3. Layers 2R, 2G and 2B are sequentially and repeatedly provided with a thickness of about 1.4 μm. A black matrix layer 4 having a thickness of about 1.4 μm is provided in the gap between the color filter layers. Further, color filter layers 2R, 2G, 2
A top coat layer 5 having a thickness of about 4 μm is provided on B and the black matrix layer 4. On this top coat layer 5, a transparent electrode 6 which has been patterned again is provided to form a color filter substrate. On the other hand, the other substrate facing each other has a transparent electrode 8 patterned in a predetermined shape on a glass substrate 7 which is a transparent substrate. These two glass substrates 1 and 7 are hermetically sealed by a seal portion 9 provided on the outer peripheral portions of both substrates, and a liquid crystal 10 is enclosed therein. To set the gap between the two substrates, the display spacers 11 are dispersedly arranged between the transparent electrodes forming the display, and the seal spacer 9 having a grain size corresponding to the gap is provided in the seal 9. It is done by mixing. Such a configuration is the basis of the liquid crystal cell of the color liquid crystal electro-optical device. In addition, a color liquid crystal electro-optical device has a structure in which a polarizing plate is attached to the outside of the other substrate facing the color filter substrate and a power supply circuit for driving liquid crystal, a controller circuit, a backlight, etc. are connected. Is. Further, the color filter substrate of this conventional example has a transparent electrode 3 under the color filter layers 2R, 2G and 2B.
Is provided. This is only when it is necessary to form a color filter. This is a color filter manufacturing method such as a polymer electrodeposition method. The transparent electrode 3 is unnecessary when a color filter manufactured by another manufacturing method such as a dyeing method, a printing method or a pigment dispersion method is used. A liquid crystal cell used in a color liquid crystal electro-optical device is a ST having excellent electro-optical characteristics.
The N (Super Twisted Nematic) method is often used. One of the important characteristics required for this STN type liquid crystal cell is the problem of cell gap uniformity. The cell gap is the gap h between the two substrates shown in FIG. 2, and includes the display portion spacer 11 and the seal portion 9.
It is controlled by the seal spacer included in the. The uniformity required for this cell gap is ± 0.1
μm or less. When the cell gap is ± 0.1 μm or more, the visibility becomes a problem because the electro-optical characteristics of the color liquid crystal electro-optical device are non-uniform, that is, the color tone is uneven and the contrast is lowered. As shown in FIG. 2, since the gap h of the cell gap and the gap k of the seal portion differ by the thickness of the color filter and the black matrix, it is difficult to control the cell gap particularly near the seal portion, and the gap of the entire liquid crystal cell is large. Was very difficult to control. Therefore, in order to make the cell gap of the liquid crystal cell used in the color liquid crystal electro-optical device uniform, the black matrix layer formed in the gap of the color filter is also used in the seal portion. By providing the same, the gap of the seal portion of the liquid crystal cell and the gap of the cell gap have the same structure. As described above, by providing the black matrix layer formed in the gap of the color filter also in the seal part, the gap of the seal part of the liquid crystal cell and the gap of the cell gap become the same. Is solved and it becomes easy to control the gap of the entire liquid crystal cell. Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view used in the color liquid crystal electro-optical device of the present invention, and FIGS. 1 (a) and 1 (b) respectively show the cut surfaces changed by 90 degrees. A transparent electrode 3 patterned in a predetermined shape is arranged on a glass substrate 1, and red, green, and blue color filter layers 2R, 2G, and 2B are sequentially and repeatedly deposited on the transparent electrode 3 by about 1. It is formed with a thickness of 4 μm. Black matrix layers 4 and 12 having a thickness of about 1.4 μm are provided in the gaps and the seal portions of the color filter layer.
As a method of forming the black matrix layer, for example, a negative photosensitive resin in which a black pigment is dispersed is applied by printing or the like and exposed from the back surface of the glass substrate 1. Further, a top coat layer 5 having a thickness of about 4 μm is provided on the color filter layers 2R, 2G, 2B and the black matrix layers 4, 12 by a spin coater or the like. On this top coat layer 5, a transparent electrode 6 which is patterned again is provided. On the other hand, the other substrate facing each other has a transparent electrode 8 patterned on a glass substrate 7 in a predetermined shape. These two glass substrates 1 and 7 are hermetically sealed by a seal portion 9 provided on the outer peripheral portion,
Liquid crystal 10 is enclosed. The seal portion 9 and the gap k between the two substrates and the gap h of the cell gap forming the display portion are substantially equal. Therefore, the particle size of the spacer mixed in the seal part 9 and the particle size of the display part spacer 11 are substantially equal to each other. For example, the seal part spacer applies an epoxy type sealant containing 6.0 μm of glass fiber powder at a ratio of 2.0 Wt% by screen printing to a thickness of about 30 μm, and the display part spacer 11 has a thickness of 6.0 μm. After disposing the plastic spacers in a dispersed manner, they were pressed and pressed under a pressure of 0.4 Kg / c for bonding. As a result, the gap of this liquid crystal cell was ± 0.4 μm with good uniformity, and it became easy to control the gap near the seal portion. The particle size may be slightly changed depending on the mixing ratio of the glass fibers, the pressure bonding conditions and the state of the substrate. Further, in this embodiment, the structure in which the color filter is formed by the electrodeposition method is described, but other methods are also effective. As described above, according to the present invention, by providing the black matrix layer also in the seal part of the color liquid crystal cell, it is possible to improve the cell gap uniformity of the seal part and the display part. did it. As a result, the color liquid crystal electro-optical device using this color liquid crystal cell was able to obtain an image with uniform color tone and contrast.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a liquid crystal cell of a color liquid crystal electro-optical device of the present invention. (A) and (b) are rotated by 90 degrees with respect to each other. FIG. 2 is a schematic cross-sectional view of a liquid crystal cell of a conventional color liquid crystal electro-optical device. (A) and (b) are rotated by 90 degrees with respect to each other. [Description of Reference Signs] 1, 7 Glass substrate 3, 6, 8 Transparent electrode 2R, 2G, 2B Color filter layer 4, 12 Black matrix layer 5 Top coat layer 9 Seal part 10 Liquid crystal 11 Display part spacer h Cell gap gap k Gap between seals

Claims (1)

Claim: What is claimed is: 1. A color filter substrate having at least a color filter layer and a black matrix layer and the other substrate on which a transparent electrode is formed are opposed to each other with a seal portion interposed between the two substrates. A color liquid crystal electro-optical device comprising a liquid crystal sealed therein, wherein at least a black matrix layer of a color filter substrate is also formed on a seal portion.