VIDEO DISPLAY DEVICE AND LIQUID CRYSTAL DRIVING DEVICE OF VIDEO DISPLAY DEVICE

• Main Author: OGURA KAZUO
• Format: Patent
• Language: English
• Published: 22.12.1994
• Edition: 5
• 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; EDUCATION; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SEALS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PURPOSE:To make a static image part easily visible with video signals in which animation image parts and static image parts coexist. CONSTITUTION:This video display device 20 for which the liquid crystal driving device is used has an image forming circuit 23 which forms image data and outputs the data and a source driver 26 which samples the RGB video signals in a horizontal direction and outputs the signals to the source electrodes of the transistors in a color liquid crystal panel 27 after amplifying the signals. This source driver 26 is provided with a timing generating circuit which generates various kinds of clocks to enable the assignment of the changing timing of a sampling clock of the RGB video signals according to the data for assigning the phase change from a CPU 21 by an arbitrary horizontal scanning line number, a sample-hold circuit which samples/holds the RGB video signals in the horizontal direction according to the clocks formed by this timing generating circuit and an output buffer which amplifies the sampling data for several horizontal dot numbers and outputs the data to the color liquid crystal panel 27 so that the phases of the sampling clocks of the RGB video signals of the source driver 26 can be changed arbitrarily.