Display apparatus capable of adjusting subfield number according to brightness
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMitsuhiro Kasahara, Yuichi Ishikawa, Tomoko Morita
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Abstract
A display apparatus adjusts the brightness of a plasma display panel. The display apparatus comprises an adjusting device, which acquires image brightness data, and adjusts the number of subfields Z on the basis of brightness data.
Claims9
A display apparatus for creating, for each image, a number of subfields Z from a first subfield to a Zth subfield in accordance with a Z bit representation of each pixel, a weight of each subfield, and a number of gradation display points, the display apparatus comprising:
- a contrast detector that detects contrast on a display panel displaying the image;
- an image characteristic determining device that determines a subfield number Z and a weighing multiple, while maintaining a same number of gradation display points, based on the contrast on the display panel;
- and
- a weight setting device that multiplies the weight of each subfield by the weighing multiple;
- wherein the image characteristic determining device decreases the subfield number Z and increases the weighing multiple as the contrast on the display panel decreases.
A display method for creating, for each image, a number of subfields Z from a first subfield to a Zth subfield in accordance with a Z bit representation of each pixel, a weight of each subfield, and a number of gradation display points, the display method comprising:
- detecting a contrast on a display panel displaying the image;
- determining a subfield number Z and a weighing multiple, while maintaining a same umber of gradation display points, based on the contrast;
- and
- multiplying the weight of each subfield by the weighing multiple,
- wherein the subfield number Z decreases and the weighing multiple increases as the contrast on the display panel decreases.
A display apparatus for creating, for each image, a number of subfields Z from a first subfield to a Zth subfield in accordance with a Z bit representation of each pixel, a weight of each subfield, a multiplication factor for amplifying an image signal, and a number of gradation display points, the display apparatus comprising:
- a contrast detector that detects contrast on a display panel displaying the image;
- an image characteristic determining device that determines a subfield number Z, a weighing multiple and the multiplication factor based on the contrast on the display panel;
- a multiplier for amplifying the image signal by the multiplication factor;
- and
- a weight setting device that multiplies the weight of each subfield by the weighing multiple,
- wherein the image characteristic determining device decreases the multiplication factor as the contrast on the display panel increases.
Dependencies are inferred from the claim text.