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US 2011/0298975 A1Published application
Control circuit of display device, and display device, and display device and electronic appliance incorporating the same
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorMasami Endo
Life of this patent
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Abstract
An object is to realize downsizing and cost reduction of a display device by efficiently using a physical region of a memory in a control circuit of the display device. A structure of a video data storage portion of the control circuit is that provided with a video data storage portion for storing video data of an n-th frame (n is a natural number), a video data storage portion for storing video data of an (n+1)th frame, and a video data storage portion for sharing video data of the n-th frame and the (n+1)th frame among received video data.
Claims1
A control circuit of a display device comprising:
- first to third video data storage portions;
- a video data format conversion portion for writing a first video data in the first video data storage portion, writing a second video data in the second video data storage portion and writing a third video data in the third video data storage portion;
- a selection means for alternating between writing of the first video data in the first video data storage portion and writing of the second video data in the second video data storage portion every one frame period;
- and
- a display control portion for alternating between reading of the first video data from the first video data storage portion and reading of the second video data from the second video data storage portion every one frame period, wherein the writing of the first video data and the reading of the first video data are alternately carried out,
- wherein the writing of the second video data and the reading of the second video data are alternately carried out, and
- wherein the third video data is read from the third video data storage portion by the display control portion during a retrace period.
4 more elements
Dependencies are inferred from the claim text.