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Clamp and gamma correction circuit, and image display apparatus and electronic machine employing the same

  • US 5,940,058 A
  • Filed: 11/06/1997
  • Issued: 08/17/1999
  • Est. Priority Date: 11/08/1996
  • Status: Expired due to Term
First Claim
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1. A clamp and gamma correction circuit comprising:

  • a clamp circuit which receives an image signal varying between a first voltage and a second voltage and clamps one of the first and the second voltages to a predetermined clamp voltage while keeping constant an amplitude between the first and the second voltage;

    a gamma correction circuit which receives the output of the clamp circuit and amplifies the output of the clamp circuit at different amplification factors depending on whether the output of the clamp circuit exceeds at least one predetermined reference voltage; and

    a voltage setting circuit that sets the clamp voltage and the at least one predetermined reference voltage to the clamp circuit and the gamma correction circuit, respectively, while varying both the clamp voltage and the at least one predetermined reference voltage, a voltage difference between the clamp voltage and the at least one predetermined reference voltage is kept constant.

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