Picture adjusting device

Abstract

Abstract PURPOSE:To adjust independently the contrast and brightness by providing the 1st pulse for contract adjustment and the 2nd pulse for brightness adjustment and bringing the level of the 2nd pulse to a constant number of multiple of the level of the 1st pulse. CONSTITUTION:A signal from a contrast adjusting signal generating circuit 21 is fed to a gate circuit 22 and gated by the gate by using a signal from a terminal 7 and the result is fed to a terminal 3. On the other hand, a signal from a luminance signal adjusting signal generating circuit 23 is multiplied with a signal from the circuit 12 by a multiplier 24, gated by a signal from a terminal 13 and the result is fed to a terminal 4. Then a value Y of the pulse fed to the terminal 4 is expressed as Y=KX, where X is the signal from the circuit 21 and K is the signal from the circuit 23, and when the values X, Y are fed to the terminals 3, 4 a gain G of the gain adjusting circuit 5 is expressed as a/x, where (a) is a reference value from a terminal 9, and a brightness adjusting pulse Y' extracted from the circuit 5 is expressed as aK, which is independent of the value X.

Inventors

• 👤 Yoshibumi Yamakawa
• 👤 山川　義文

Bibliographic Details