| 摘要 |
The display device is able to make an image of a dark scene to become easy to see without increasing a contrast. A composite video signal from an input terminal (1) is supplied to a separating circuit 2, in which it is separated to provide a luminance signal and two color-difference signals. The luminance signal thus separated is supplied to a dynamic gamma circuit (5). In this dynamic gamma circuit (5), its gamma correction curve between an input and an output thereof is changed in response to a control signal from a control circuit (11) in such a manner that an intermediate signal level is increased from approximately a straight line, for example. Then, the luminance signal thus gamma-corrected and two color-difference signals are converted by a converting circuit (6) into three primary color signals, and supplied through respective A/D-converting circuits (7R, 7G, 7B) to a display means (8) such as a plasma display or the like. Also, the luminance signal from the separating circuit (2) is supplied through a comparing circuit (9) to an integrating circuit (10). A signal from this integrating circuit (10) is supplied to the control circuit (11), from which there is generated a control signal whose magnitude corresponds to an average luminance level.
|
