Display device and luminance control method therefor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMitsuhiro Kasahara, Yuichi Ishikawa, Tomoko Morita
Life of this patent
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Abstract
A temperature difference estimated value is found from a video signal using a temperature estimated value representing the temperature of the panel outer periphery of a display screen of a PDP and a reference value representing the temperature of the panel outer periphery of the PDP which is outputted from a panel periphery temperature setter by a temperature difference estimator, and the luminance of an image displayed on a display is controlled depending on the temperature difference estimated value by a controller and a brightness controller.
Claims10
A display device, comprising:
- a display having a display screen, that displays an image with a gray scale corresponding to a video signal using a plurality of light emitting formats which are equal in a total number of gray scales but which differ in the number of light emitting pulses on each of the gray scales, and an outer peripheral portion adjacent to said display screen;
- a temperature estimation device that provides a temperature estimation value, that corresponds to a temperature of said display screen, from said video signal;
- an operation device that obtains a temperature difference estimation value based upon a reference value, that corresponds to a temperature of said outer peripheral portion, and said temperature estimation value;
- and
- a control device that selects a light emitting format, from said plurality of light emitting formats, based upon said temperature difference estimation value, to lower a luminance of said image as said temperature difference estimation value increases.
A method for controlling a luminance of a display having a display screen, that displays an image with a luminance corresponding to a video signal, and an outer peripheral portion adjacent to said display screen, comprising:
- estimating a temperature estimation value, corresponding to a temperature of the display screen, from the video signal;
- determining a temperature difference estimation value using a reference value corresponding to the temperature of the outer peripheral portion and the temperature estimation value;
- selecting a light emitting format, from among a plurality of light emitting formats, based upon the temperature difference estimation value;
- and
- lowering the luminance of the image as the temperature difference estimation value increases.
A display device, comprising:
- a display having a display screen, that displays an image with a gray scale corresponding to a video signal using a plurality of light emitting formats which are equal in a total number of gray scales but which differ in the number of light emitting pulses on each of the gray scales, and an outer peripheral portion adjacent to said display screen;
- a temperature estimation device that provides a temperature estimation value, that corresponds to a temperature of said display screen, from said video signal;
- an operation device that obtains a temperature difference estimation value based upon a reference value, that corresponds to a temperature of said outer peripheral portion, and said temperature estimation value;
- and
- a control device that controls that luminance of the image based on the temperature difference estimation value.
Dependencies are inferred from the claim text.