Display Device, Contrast Adjusting Method and Contrast Adjusting Program
AssigneePanasonic Corporation
InventorNobumichi Takaba
Life of this patent
Estimating the term…
Abstract
A feature detecting circuit 4 detects an average luminance, a white area value and a black area value of a video signal, and a control circuit 5 controls a contrast adjusting circuit 2 such that a contrast gain of the video signal is more moderately increased than decreased according to changes of the detected average luminance, white area value and black area value. As a result, a good video quality can be obtained upon both increasing and decreasing the contrast gain of the video signal to adjust the contrast of the video signal.
Claims13
1-12. (canceled)
A display device, comprising:
- an adjusting portion for adjusting the contrast of a video signal;
- a detecting portion for detecting a feature quantity of the video signal;
- a control portion for controlling a contrast adjusting operation of the adjusting portion according to a change of the feature quantity detected by the detecting portion;
- and
- a display portion for displaying a video image using the video signal having the contrast thereof adjusted by the adjusting portion,
- wherein the control portion controls the adjusting portion such that a contrast gain of the video signal is more moderately increased than decreased according to the change of the feature quantity detected by the detecting portion.
A contrast adjusting method for a display device, comprising:
- a detection step of detecting a feature quantity of a video signal;
- an adjustment step of adjusting the contrast of the video signal according to a change of the feature quantity detected in the detection step;
- and
- a display step of displaying a video image using the video signal adjusted in the adjustment step,
- wherein, in the adjustment step, the contrast gain of the video signal is more moderately increased than decreased according to the change of the feature quantity detected in the detection step.
A computer-readable recording medium storing a contrast adjusting program for a display device causing a microcomputer built in the display device comprising a detecting portion for detecting a feature quantity of a video signal, an adjusting portion for adjusting the contrast of the video signal, and a display portion for displaying a video image using the video signal adjusted by the adjusting portion to function as:
- an obtaining portion for obtaining the feature quantity detected by the detecting portion;
- and
- a control portion for controlling a contrast adjusting operation of the adjusting portion according to a change of the feature quantity obtained by the obtaining portion,
- wherein the control portion controls the adjusting portion such that the contrast gain of the video signal is more moderately increased than decreased according to the change of the feature quantity obtained by the obtaining portion.
Dependencies are inferred from the claim text.