JPH09189902A - Liquid crystal device and information transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower reflectivity and to prevent light leakage by bringing color filters into stable and tight contact with a substrate. SOLUTION: Line-like light shielding layers 4, the color filters 5 and transparent electrodes (information electrodes) 7 are formed on the glass substrate 2 on a display surface side. Light shielding layers 4, and transparent electrodes (scanning electrodes) 10 respectively having opening regions 10a and spacings 10b in the positions corresponding to the color filters 5 are formed on the glass substrate 3 on the rear surface side disposed with an illumination device (back light). As a result, the color filters 5 come into stable and tight contact with the glass substrate 2 and the reflectivity is lowered. The light leakage is thus prevented by the transparent electrodes (scanning electrodes) 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal device and an information transmission device for displaying information using liquid crystal.

[0002]

2. Description of the Related Art In a liquid crystal display element for color display, a color filter composed of red (R), green (G) and blue (B) pixels for color display is formed on one of a pair of glass substrates. Has been done. In order to perform high-quality display in such a liquid crystal display element, light leakage due to illumination of the illumination device (backlight) is prevented between the pixels of red (R), green (G), and blue (B). That is also one of the important matters.

Conventionally, in order to prevent light leakage between pixels of a color filter, for example, the black matrix is overlapped with the edge of each pixel so that each pixel is shielded by a black matrix such as a Cr film as a light shielding layer. To prevent light from leaking from between the pixels.

[0004]

However, in the above-mentioned conventional liquid crystal display element, the black matrix is formed so as to overlap the edge portion of each pixel of the color filter in order to prevent light leakage from between pixels. Considering the adhesiveness between the black matrix that is a metal and the color filter that is a resin material, the degree of freedom in selecting these materials is small, and the color filter cannot be stably adhered to the substrate.

Further, by forming the black matrix so as to shield each pixel of the color filter, the installation area of the black matrix becomes large. Therefore, when the glass substrate on which the black matrix is formed is arranged on the display surface side (observation side), the reflectance is increased and the visibility is lowered.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a liquid crystal device and an information transmission device in which the adhesion of a color filter is good, the reflectance is low, and light leakage does not occur.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a liquid crystal device in which liquid crystal is sandwiched between a pair of substrates arranged so as to face each other, one of the substrates is provided. A line-shaped light-shielding layer formed at a predetermined interval, a color filter formed between the light-shielding layers so as not to contact the light-shielding layer, and orthogonal to the light-shielding layer through a protective film on the color filter. A plurality of information electrodes formed so as to form, on the other substrate, the light-shielding layer, and a plurality of scanning electrodes having an opening region at a position corresponding to the color filter, and the information electrodes. The feature is that they are formed so as to be orthogonal to each other.

Further, one of the substrates having the information electrodes formed thereon may be arranged on the display surface side, and the other substrate having the scanning electrodes formed thereon may be arranged on the rear surface side of the illuminating device. It has a feature.

Further, it is characterized in that the color filter is composed of red, green and blue pixels or red, green, blue and white pixels.

Further, the information transmission device according to the present invention includes a graphic controller for outputting a data signal and a scanning method signal, a scanning signal control circuit for outputting scanning line address data and a scanning method signal, a display data and a scanning method signal. Is provided with an information signal control circuit for outputting the liquid crystal display device and any one of the liquid crystal devices described above.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic plan view showing a liquid crystal display element which is a liquid crystal device according to an embodiment of the present invention, and FIG. 2 is a schematic sectional view thereof. The liquid crystal display element 1 includes a pair of glass substrates 2 and 3 arranged to face each other,
On the glass substrate 2 located on one display surface side (observation side), a black matrix 4, a color filter 5, a protective film 6, and a transparent electrode (IT) which is an information electrode (segment electrode).
O film) 7, insulating film 8 and alignment film 9 are formed, and the transparent electrode (ITO film) 10, which is a scanning electrode (common electrode), the insulating film 11, and the alignment film 12 are formed on the glass substrate 3 located on the back side.
And a liquid crystal (for example, a chiral smectic liquid crystal) 13 is injected between the alignment films 9 and 12.
An illumination device (backlight) 14 is arranged below the glass substrate 3.

The black matrix 4 is formed of Mo on the glass substrate 2 by a sputtering method with a film thickness of about 800 Å at predetermined intervals in a line shape (for example, line width: 10 μm).
And the pitch is 315 μm).

The color filter 5 has a large number of one display pixel composed of red (R), green (G), blue (B) and white (W) pixels R, G, B and W, respectively. The color display is performed by mixing colors by controlling the voltage applied between each transparent electrode (information electrode) 7 and the transparent electrode (scanning electrode) 10. Further, the color filter 5 is the black matrix 4
Are formed so as not to contact the black matrix 4. This color filter 5 is formed on the glass substrate 2 by 1.5 μm by photolithography, for example.
It is formed with a film thickness of about.

The transparent electrode (information electrode) 7 is formed orthogonal to the black matrix 4. The transparent electrode (information electrode) 7 is formed by depositing an ITO film with a film thickness of about 600 Å on the protective film 6 formed on the color filter 5 by, for example, a spin coating method, for example, by a sputtering method, and by a photolithographic method. Patterning (for example, line width: 100 μm, display area: 90 μm × 3
10 μm).

In addition, a portion other than the effective display area of the transparent electrode (information electrode) 7 is formed by, for example, a sputtering method.
An Al film is formed with a film thickness of about 500 Å, and the auxiliary electrode is patterned by the photolithography method.

The transparent electrode (scanning electrode) 10 is orthogonal to the opposing transparent electrode (information electrode) 7, and the color filter 5
Of the pixels R, G, B, and W, which are the display areas, in the opening 10a (in the drawing, the openings 10 in some of the pixels R are
(only a is shown) is formed, and the glass substrate 2
A gap 10b as an opening region is formed at a position corresponding to the linear black matrix 4 formed in the above.
The opening 10a is formed slightly smaller than each pixel R, G, B, W.

The transparent electrode (scanning electrode) 10 is formed by forming an ITO film on the glass substrate 3 by sputtering, for example, to a film thickness of about 600 Å, and patterning it by photolithography (for example, between lines: 5 μm, Pitch: 315 μm), and the openings 10a and the gaps 10b are formed at the positions corresponding to the pixels R, G, B, and W of the color filter 5 formed on the glass substrate 2 on the opposite side and at the positions corresponding to the black matrix 4, respectively. Form.

In addition, an Al film is formed on the transparent electrode (scanning electrode) 10 except the effective display region by sputtering, for example, to a film thickness of about 1500 Å, and the auxiliary electrode is patterned by photolithography. .

The transparent electrodes (information electrodes) 7 and the transparent electrodes (scanning electrodes) 10 have TaO as insulating films 8 and 11, respectively.
x is formed to have a film thickness of about 1000 Å by, for example, a sputtering method, and further 2 is formed on the surface by, for example, a printing method.
Alignment films 9 and 12 are formed with a film thickness of about 00Å, and are rubbed.

Then, spherical spacers (not shown) having a uniform diameter are scattered between the alignment films 9 and 12, the glass substrates 2 and 3 are attached, and the periphery thereof is sealed by a sealing material (not shown). Between the alignment films 9 and 12 (for example, liquid crystal
Chiral smectic liquid crystal) 13 is injected.

The liquid crystal display element 1 according to this embodiment is configured as described above, and the color filter 5 is formed on the glass substrate 2 arranged on the display surface side (observation side), and the rear surface side (illumination device). 14 side) on the glass substrate 3 at the positions corresponding to the respective pixels R, G, B, W of the color filter 5
and a transparent electrode (scanning electrode) having a gap 10b at a position facing the linear black matrix 4
By forming 10, transparent electrodes (scanning electrodes) 10
Thus, it is possible to prevent light leakage due to the illumination of the illumination device 14 from portions other than the pixels R, G, B, W of the color filter 5, and it is possible to improve the contrast.

Since the color filter 5 and the transparent electrode (information electrode) 7 are formed on the glass substrate 2 arranged on the display surface side (observation side), the space between the color filter 5 and the transparent electrode (information electrode) 7 is reduced. High-precision alignment can be easily performed.

Further, since the black matrix 4 which is a metal is formed so as not to contact the color filter 5 on the glass substrate 2 arranged on the display surface side (observation side), the degree of freedom in selecting the material of the color filter 5 is increased. Is increased, and the color filter 5 can be stably attached to the glass substrate 2.

Further, since the black matrix 4 and the transparent electrode (information electrode) 7 are formed in the shape of a line having a narrow width and are orthogonal to each other, the black matrix 4 and the transparent electrode (information electrode) 7 are arranged between the black matrix 4 and the transparent electrode (information electrode) 7. The probability of occurrence of short circuit can be reduced.

Further, since the black matrix 4 formed on the glass substrate 2 arranged on the display surface side (observation side) can have a small area due to the narrow line shape, the reflectance is lowered, Visibility is improved.

Furthermore, since the surface area of the auxiliary electrode formed on the transparent electrode (scanning electrode) 10 can be increased,
It is possible to reduce the resistance of the transparent electrode (scanning electrode) 10. In the above-described embodiment, the color filter 5 is composed of four pixels R, G, B and W of red (R), green (G), blue (B) and white (W). A color filter may be configured with three pixels R, G, and B of (R), green (G), and blue (B).

FIG. 3 is a block diagram showing the configuration of an information transmission device equipped with the liquid crystal display element 1 described above. The information transmission device 30 includes the liquid crystal display element 1 described above, a drive control unit 31, and a graphic controller 32.

The liquid crystal display element 1 includes a scanning signal applying circuit 3
3 and the information signal applying circuit 34 are connected. The drive control unit 31 includes a scan signal control circuit 35, an information signal control circuit 36, and a drive control circuit 37. The scan signal control circuit 35 outputs scan line address data to the scan signal applying circuit 33 to control the information signal. The circuit 36 is the information signal applying circuit 34.
Output display data to Further, the scanning signal control circuit 3
5. The data and the scanning method signal are input to the information signal control circuit 36 from the graphic controller 32 through the drive control circuit 37.

The data output from the graphic controller 32 is converted into address data and display data by the scanning signal control circuit 35 and the information signal control circuit 36, respectively, and the scanning method signal is directly used as the scanning signal application circuit 33.
And an information signal application circuit 34.

Further, the scanning signal application circuit 33 applies a scanning signal having a waveform determined by the scanning method signal to the transparent electrode (scanning electrode) 10 of the liquid crystal display element 1 determined by the address data, and the information signal application circuit 34 causes the liquid crystal Display element 1
Is applied to the transparent electrode (information electrode) 7 of FIG. 2 with a waveform determined by two of the display content of white or black and the scanning method signal sent by the display data.

The information transmission device 30 according to the present embodiment is configured as described above, and since the liquid crystal display element 1 has a low reflectance and does not leak light, high quality display can be performed.

[0033]

As described above, according to the present invention,
A scan in which a line-shaped light-shielding layer, a color filter arranged so as not to contact the light-shielding layer, and an information electrode are formed on one substrate, and the light-shielding layer is formed on the other substrate, and an opening region is provided at a position corresponding to the color filter. By forming the electrodes,
Since the color filter is not in contact with the light shielding layer, the adhesion between the color filter and the substrate is improved, and the scanning electrode can prevent light leakage to improve the contrast.
Furthermore, since the reflectance is also low, good color display quality can be obtained.

Further, in the information transmission device provided with the liquid crystal device according to the present invention, it is possible to perform high-quality display with high contrast.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a liquid crystal display element according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a liquid crystal display element according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of an information transmission device including a liquid crystal device according to the present invention.

[Explanation of symbols]

 1 Liquid Crystal Display Element (Liquid Crystal Device) 2, 3 Glass Substrate (Substrate) 4 Black Matrix 5 Color Filter 7 Transparent Electrode (Information Electrode) 10 Transparent Electrode (Scanning Electrode) 10a Opening (Opening Area) 10b Gap (Opening Area) 13 Liquid crystal (chiral smectic liquid crystal) 14 Lighting device 30 Information transmission device

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yuko Yokoyama 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (4)

[Claims] 1. A liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates arranged so as to face each other, and a line-shaped light-shielding layer formed at a predetermined interval on one of the substrates, and the light-shielding layer. A color filter formed between the light-shielding layers so as not to come into contact with the light-shielding layer, and a plurality of information electrodes formed on the color filter so as to be orthogonal to the light-shielding layer via a protective film, and the other substrate A liquid crystal device, comprising: the light-shielding layer and a plurality of scan electrodes each having an opening region at a position corresponding to the color filter, formed so as to be orthogonal to the information electrodes. 2. The one substrate on which the information electrodes are formed is arranged on the display surface side, and the other substrate on which the scanning electrodes are formed is arranged on the rear surface side on which the illumination device is arranged. Item 3. The liquid crystal device according to item 1. 3. The liquid crystal device according to claim 1, wherein the color filter includes red, green and blue pixels or red, green, blue and white pixels. 4. A graphic controller that outputs a data signal and a scanning method signal, a scanning signal control circuit that outputs scanning line address data and a scanning method signal, and an information signal control circuit that outputs display data and a scanning method signal. An information transmission device comprising: the liquid crystal device according to any one of claims 1 to 3.