COLOR DISPLAY DEVICE

• Main Author: OSADA NAOYUKI
• Format: Patent
• Language: English
• Published: 13.04.1992
• Subjects: ADVERTISING; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION; CRYPTOGRAPHY; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DISPLAY; DISPLAYING; EDUCATION; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FREQUENCY-CHANGING; LABELS OR NAME-PLATES; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SEALS; SIGNS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PURPOSE:To offer a color display device which is improved in productivity without requiring any complex manufacturing process by superposing an EL panel which changes in color and a liquid crystal panel which forms light- transmissive areas selectively on it. CONSTITUTION:The EL panel 1 is in a flat plate shape on the whole and constituted by superposing plural EL layers which change in color to generate respective colors of, for example, R, G, and B. The liquid crystal panel 2 is superposed on the EL panel like this and this liquid crystal panel 2 forms light-transmissive areas selectively and may have matrix constitution of, for example, row and column electrodes. This constitution omits a process of manufacturing the high- density R, G, and B color filters of the liquid crystal panel 2 and the productivity is improved. Further, one light-shielding and light-transmissive areas of the liquid crystal panel are regarded as one picture element, on which a desired color can be displayed, so an excessive request for high-density integration is prevented.