DIGITAL GAMMA CORRECTING METHOD AND LIQUID CRYSTAL DEVICE USING THE SAME

PROBLEM TO BE SOLVED: To provide a high-accuracy, high-speed and low-cost digital gamma correcting method by providing simplified and detailed modes for converting the gradation of a digital video signal according to gamma correction data generated while using simplified and detailed characteristics...

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Bibliographic Details
Main Author KABURAGI CHIHARU
Format Patent
LanguageEnglish
Published 29.10.1999
Edition6
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
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
FREQUENCY-CHANGING
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
SEALS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Summary:PROBLEM TO BE SOLVED: To provide a high-accuracy, high-speed and low-cost digital gamma correcting method by providing simplified and detailed modes for converting the gradation of a digital video signal according to gamma correction data generated while using simplified and detailed characteristics approximate to the driving voltage/transmission factor characteristics of a liquid crystal panel. SOLUTION: In the simplified mode, first of all, the parameter of simplified V-T characteristics is read from a ROM 6, the simplified V-T characteristics are reproduced in a RAM for work inside a CPU 5, and the gamma correction data are calculated and stored in an LUT 1 corresponding to a driving voltage range. In the detailed mode, on the other hand, the parameter of detailed V-T characteristics is read from the ROM 6, the detailed V-T characteristics are reproduced in the RAM for work inside the CPU 5, and the gamma correction data are calculated and stored in the LUT 1 corresponding to the driving voltage range. Then, prescribed gamma correction is performed for digital video data 100 by the LUT 1, digital/analog conversion is performed for corrected digital video data 101 by a DAC 2 and an analog video signal 102 is outputted.
Bibliography:Application Number: JP19980105224