JPH0580304A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To shield the scattered light of grid-shaped spacings and the picture element parts of an off state and to obtain the bright black color and high contrast by forming light shielding layers facing the grid-shaped spacings of the transparent electrodes on an inlet side on a glass substrate on an exit side. CONSTITUTION:This device is constituted by providing the light shielding layers in the regions of the grid-shaped spacings exclusive of the effective picture element parts on the glass substrate on the exit side. Namely, the light shielding layers 6 consisting of Cr/Cr oxide layers of, for example, 200mm film thickness are formed in the regions facing the grid-shaped spacings 4a of the transparent electrodes 4 of the glass substrate 2 facing the glass substrate 1 under the transparent electrodes 3 thereof. The effective picture element parts consist of picture elements of 50mum square in such a manner. The contrast of about 60 heretofore is improved to 100 and is greatly upgraded in the case of the size of the transparent electrodes 4 being 40mum square. The scattered light of the liquid crystal layer of the effective picture elements in the off state and the grid-shaped spacings 4a is shielded by the light shielding layers and is not emitted and, therefore, the bright black color and high contrast are obtd. and particularly the effect of high-density picture elements is high.

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 device,
In particular, the present invention relates to a liquid crystal display device made of polymer-impregnated liquid crystal.

[0002]

2. Description of the Related Art A conventional liquid crystal display device made of a polymer-impregnated liquid crystal will be described with reference to FIGS.

FIG. 2 is an enlarged sectional view of a main part of a liquid crystal display device,
FIG. 3 and FIG. 4 are schematic cross-sectional views for explaining the operation, showing the off state and the on state, respectively.

Referring to FIG. 2, in the conventional liquid crystal display device, the transparent electrodes 3 and 4 for driving are provided on the opposing surfaces of the pair of glass substrates 1 and 2, and the entire surface of the glass substrate 1 and the glass substrate. 2 is formed on the entire surface with a grid-like gap so as to form an effective pixel, and a polymer-impregnated liquid crystal is sandwiched between the glass substrates 1 and 2.

The operation of the liquid crystal display device configured as described above will be described with reference to FIGS. 3 and 4.

As shown in FIG. 3, transparent electrodes 3 and 4 are provided.
When no voltage is applied between the two, the liquid crystal 5b impregnated in the polymer 5a is dispersed in an arbitrary direction, and the incident light indicated by the arrow L ₁ from one glass substrate 2 is caused by the liquid crystal 5b. As shown by L ₂ , the light is scattered to be in an optically dark state. On the other hand, as shown in FIG. 4, when a voltage is applied between the transparent electrodes 3 and 4, the liquid crystal 5b impregnated in the polymer 5a aligns the liquid crystal orientation in one direction, so that the incident light is not scattered and the arrow It is emitted as transmitted light indicated by L ₃ and is in an optically bright state. The display device is operated by electrically controlling the above state.

[0007]

However, in the above configuration, since the incident light is scattered to form a dark state in the off state, the black sinking is poor, and in the bright state, the transparent electrode 4 has a grid pattern. Since the incident light to the gap 4a is scattered, there is a problem that the contrast of the effective pixel is low. Particularly, in the high-density liquid crystal display device, there is a problem that the area ratio of the effective pixel portion is reduced and the contrast is extremely lowered.

The present invention solves the above problems and provides a liquid crystal display device capable of obtaining an image having a bright black color and high contrast.

[0009]

In order to solve the above-mentioned problems, the present invention provides a light-shielding layer on the glass substrate 1 on the emission side in the area of the lattice-shaped gaps 4a excluding the effective pixel portion.

[0010]

With the above structure, scattered light from the effective pixels in the off state and the liquid crystal layer in the lattice-shaped gap 4a is blocked by the light-shielding layer and is not emitted, so that a clear black color and high contrast can be obtained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.

FIG. 1 is an enlarged cross-sectional view of a main part of a liquid crystal display device according to the present invention. The difference from the conventional example shown in FIG. 2 is that a glass substrate 1 is provided under a transparent electrode 3 and a glass substrate facing the transparent electrode 3. In a region facing the lattice-shaped gap 4a of the second transparent electrode 4,
For example, the light-shielding layer 6 made of a Cr / oxide Cr layer having a film thickness of 200 nm
Is the point that formed. Others are the same as the conventional example,
The same components are designated by the same reference numerals, and the description thereof will be omitted.

According to the present embodiment, when the size of the transparent electrode 4 is 40 μm square and the pixel is 50 μm square, the conventional contrast is about 60, and the contrast is improved to 100, which is a great improvement.

[0014]

As described above, according to the present invention,
Unnecessary scattered light is removed by the light-shielding layer, and a liquid crystal display device having clear black and high contrast can be obtained. The effect is particularly great in high-density pixels.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of a liquid crystal display device according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of a conventional liquid crystal display device.

FIG. 3 is a schematic cross-sectional view for explaining the operation of the liquid crystal display device.

FIG. 4 is a schematic cross-sectional view for explaining a liquid crystal display device.

[Explanation of symbols]

1, 2 ... Glass substrate, 3, 4 ... Transparent electrode, 4a ... Lattice gap, 5 ... Polymer impregnated liquid crystal, 5a ... Polymer,
5b ... Liquid crystal, 6 ... Light-shielding layer.

Claims (1)

[Claims] 1. A transparent electrode is provided on the entire surface of the glass substrate on the emission side, and a large number of transparent electrodes are separated on the glass substrate on the incident side by lattice-shaped gaps, on the opposite surfaces of the pair of glass substrates. A liquid crystal display device in which a polymer-impregnated liquid crystal is sandwiched between the glass substrates formed above, and a light-shielding layer facing the above-mentioned lattice-shaped gaps is formed on the exit-side glass substrate.