| 摘要 |
PROBLEM TO BE SOLVED: To provide a gamma correcting circuit which controls a gamma correction quantity without affecting a correction point (inflection point) nor frequency characteristics. SOLUTION: The gamma correcting circuit 101 includes a main signal processing circuit 11 and a correction signal generating circuit 12. The main signal processing circuit 11 inputs a video signal (RGB signal and primary-color signal) Si and generates a signal according to a specific voltage and an output resistance which are not illustrated. The correction signal generating circuit 12 includes current differential amplifiers gm-AMP1 to gm-AMP3 corrected in parallel and is so constituted that the video signal is inputted and outputs are added to the signal generation of the main signal processing circuit 11. A video signal So obtained by adding a gamma correction signal to main signal processing like this is supplied to a signal amplifying circuit (preamplifier PreAmp here) of, for example, a computer display system.
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