Unlock instant, AI-driven research and patent intelligence for your innovation.

Liquid crystal device and electronic equipment

a liquid crystal device and electronic equipment technology, applied in static indicating devices, non-linear optics, instruments, etc., can solve the problems of difficult to remove the electrostatic charge, difficult to display a high-quality image, and tend to be electrostatically charged substances

Inactive Publication Date: 2009-06-23
SEIKO EPSON CORP
View PDF19 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a liquid crystal device with a structure that prevents electrostatic charging and ensures a high-quality image. This is achieved by using a light-shielding metal film on the other-side substrate, which has no electrodes for driving the liquid crystal and maintaining a fixed voltage. The conductive film can be made of various metallic materials and is not required to be transparent. The fixed voltage can be a ground voltage, a voltage on the common electrode, the center voltage of the image signal amplitude, a non-selection voltage of the scanning signal, or a logic voltage provided from an external driving means. This technique allows for the use of existing voltages without generating an additional voltage and provides high resistance to electrostatic charging.

Problems solved by technology

This can cause a problem in that the substrate tends to be electrostatically charged.
The electrostatic charge disturbs the orientation of the liquid crystal and thus it becomes impossible to display a high-quality image.
Once the substrate is electrostatically charged, it is difficult to remove the electrostatic charge because there is no electrode on the other-side substrate.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Liquid crystal device and electronic equipment
  • Liquid crystal device and electronic equipment
  • Liquid crystal device and electronic equipment

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

(First Embodiment)

[0048]FIG. 1 is a schematic diagram illustrating a main part of a liquid crystal device according to the present invention, wherein FIG. 1a is a plane view of a color filter substrate 104, and FIG. 1b is a cross-sectional view of the liquid crystal device. The structure is described first. Two transparent glass substrates 104 and 109 with a thickness of 1.1 mm are disposed in close proximity to each other, and a liquid crystal layer 106 is disposed between them. A light-shielding chromium (Cr) film 101, a red / green / blue (RGB) color filter 102, and an orientating film 105 are formed one on another on the inner surface of the upper glass substrate 104, and a polarizing plate 103 is disposed on the outer surface of the upper glass substrate 104. Common electrodes 111, an insulating layer 108, pixel electrodes 112, and an orientating film 107 are formed on the inner surface of the lower glass substrate 109, and a polarizing plate 110 is disposed on the outer surface of...

second embodiment

(Second Embodiment)

[0059]In this second embodiment, as shown in FIG. 9, the liquid crystal device has a similar structure to that employed in the first embodiment except that the light-shielding chromium film 903 formed on the upper glass substrate (101 in FIG. 1) is grounded. The structure of the liquid crystal device is described in further detail below with reference to FIG. 9. FIG. 9a is a plane view of a liquid crystal panel, and FIG. 9b is an enlarged cross-sectional view illustrating a part in which an electric connection between the upper and lower substrates is made via a silver paste. The light-shielding chromium film 903 formed on the inner surface of the upper substrate 901 (104 in FIG. 1) is connected to a dummy electrode 904 formed on the inner surface of the lower substrate 902 (109 in FIG. 1) wherein the connection is made via the silver paste 905 and at a point outside the seal area 906. As shown in FIG. 9b, the dummy electrode 904 is electrically connected via an a...

third embodiment

(Third Embodiment)

[0062]In this third embodiment, the liquid crystal device has a similar structure to that employed in the first embodiment except that the light-shielding chromium film formed on the upper glass substrate is connected to the amplitude center voltage (605 in FIG. 6) of the image signal. The connection is made in the same manner as shown in FIG. 9, and the dummy electrode 904 is connected to a voltage line for supplying the amplitude center voltage of the image signal wherein the voltage line is formed on a flexible circuit board 909 mounted on the liquid crystal panel. The liquid crystal device constructed in the above-described manner was subjected to an electrostatic voltage test under an application of about 1 kV. Without encountering electrostatic charging, a high-quality image was displayed, and no disturbance in the liquid crystal orientation was observed.

[0063]In the liquid crystal device constructed in the above-described manner according to the third embodi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
angleaaaaaaaaaa
voltageaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

A liquid crystal device has a structure in which an electric field is applied across a liquid crystal in a direction substantially parallel to the plane of a substrate. A conductive film is formed on a first substrate on which an electric field control is provided, and also on a color filter substrate located opposite the first substrate, and the conductive films are maintained at either a ground voltage, a common electrode voltage, the center voltage of an image signal, a non-selection voltage of a scanning signal, or a logic voltage of an external driver or otherwise the voltage of the conductive films is maintained in a floating state. The liquid crystal device having the above structure displays a high-quality image without encountering an influence of electrostatic charges.

Description

[0001]This application is a Division of Ser. No. 08 / 952,018 Nov. 4, 1997 U.S. Pat. No. 6,346,932.[0002]This is a Division of application Ser. No. 08 / 952,018 filed Nov. 14, 1997 now U.S. Pat. No. 6,346,932. The entire disclosure of the prior application(s) is hereby incorporated by reference herein in its entirety.FIELD OF THE INVENTION[0003]The present invention relates to an active matrix type liquid crystal device including active elements located at respective pixels (also called picture elements) thereby controlling the voltage applied to the liquid crystal at the respective pixels, and more particularly, to a liquid crystal device of the type in which a voltage is applied in a lateral direction (along the layer) to the liquid crystal at the respective pixels.[0004]The present invention also relates to electronic equipment using such a liquid crystal device.BACKGROUND TECHNOLOGY[0005]The great majority of liquid crystal devices used in notebook personal computers or liquid cryst...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): G09G3/36G02F1/1335G02F1/1343
CPCG02F1/133512G02F1/134363G02F1/136204G02F2201/121G02F1/133514
Inventor MAEDA, TSUYOSHI
Owner SEIKO EPSON CORP