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Color display device using light shutter and color filters

a color display device and color filter technology, applied in the field of color display devices, can solve the problems of less than completely satisfactory color reproduction in such devices, heavy cathode ray tubes, and occupying a lot of space where used, and achieves superior color reproduction, bright and high saturation, and high purity of color in saturation.

Inactive Publication Date: 2000-07-25
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

A further object of the present invention is to provide a color display device having a high purity of color in saturation and superior color reproduction.
Yet another object of the present invention is to provide a color liquid crystal display device which shows bright and high saturation and excellent color reproduction by combining color filters with a light source which has peaks in each wavelength range corresponding to red, blue, and green.

Problems solved by technology

Cathode ray tubes are heavy and take up a lot of space where used.
However, color reproduction in such devices has proven less than completely satisfactory.

Method used

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Examples

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Embodiment Construction

Reference is first made to FIGS. 1A and 1B which depict full color display devices generally indicated at 10a and 10b, respectively. Display devices 10a and 10b include a light shutter 2 which may be a liquid crystal light shutter, a color filter 1 adjacent thereto, and a light source 3. Output light 4 is modulated according to display information. Color device 10b in FIG. 1B includes a reflector 5. Various types of constructions of transparent-type full color liquid crystal display devices wherein a light source is provided at the back of a liquid crystal light shutter as depicted in FIG. 1A have been proposed. In addition, reflective type devices wherein a light source is provided in front of a light shutter as depicted in FIG. 1B have also been proposed heretofore.

FIG. 2A and 2B show arrangements of color filters and light shutters. FIG. 2A shows a case utilizing an additive mixture of colors and FIG. 2B show a case using a subtractive mixture of colors. In FIG. 2A, R(red), G(gre...

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PUM

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Abstract

A color display device particularly adapted for use in flat panel applications provides a bright picture with high saturation and excellent color reproduction. The color display device includes a light shutter mechanism which controls the amount of light passing therethrough. Color filters of different colors are disposed adjacent to the light shutter mechanism and include a plurality of color elements. Each color filter has a peak at the transmittance spectrum thereof. A light source illuminates the light shutter mechanism with the light source having peaks in a luminance spectrum adjusted to correspond to the peaks of the transmittance spectrum of each color filter.

Description

BACKGROUND OF THE INVENTIONThe present invention is directed to a color display device and, in particular, to a color liquid crystal display device which utilizes a light source and color filters whose properties are selected to provide a high purity of color saturation and superior color reproduction.Various types of color reproduction display screens or devices have been utilized over the years. The standard is a conventional cathode ray tube (CRT) which is utilized in television sets and other types of monitors. Cathode ray tubes are heavy and take up a lot of space where used.Flat television screens or monitors have recently been proposed. One such type of flat television screen or display panel which utilizes a liquid crystal image display panel with integrated addressing circuitry is disclosed in U.S. Pat. No. 3,840,695. Advances have also been made in addressing liquid crystal flat-panel colored television display devices by utilizing a thin-film transistor matrix. See, for e...

Claims

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Application Information

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IPC IPC(8): F21V8/00G02F1/1335G02F1/13H01J29/89H01J61/02H04N9/12G02B6/00G02F1/13357
CPCG02B6/0038G02B6/0046G02B6/005G02B6/0068G02B6/0071G02F1/133514G02F1/133609H01J29/898H01J61/025H04N9/12G02B6/0036G02F2001/133607H01J2229/8926G02F1/133607
Inventor SONEHARA, TOMIO
Owner SEIKO EPSON CORP
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