Display device and method for driving same
AssigneeSharp Kabushiki Kaisha
InventorsFumiyuki Kobayashi, Akizumi Fujioka, Asahi Yamato, Taketoshi Nakano, Toshihiro Yanagi
Life of this patent
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Abstract
A memory access section 16 writes, in a memory (10), a received image signal, in a case where a current frame is one that is located right before a frame in a scanning signal. On the other hand, the memory access section 16 does not write, in the memory (10), a received image signal, in a case where the current frame is one that is located right before a frame in a pause period. This allows a further reduction in electric power used to write, in the memory (10), an image signal received from outside.
Claims10
A display device comprising:
- a display panel including a plurality of scanning lines, a plurality of data lines which intersect with the plurality of scanning lines, and a plurality of pixels which are provided near respective intersections of the plurality of scanning lines and the plurality of data lines;
- control signal output means for outputting a control signal which alternately designates (i) a scanning period in which a whole region on a screen of the display panel is scanned and which is constituted by at least one first frame and (ii) a pause period in which at least part of the region on the screen is not scanned and which is constituted by at least one second frame;
- receiving means for receiving, in each of the at least one first frame and the at least one second frame, an image signal supplied from outside of the display device;
- a memory having a region in which the image signal received by the receiving means is stored;
- writing means for (i) writing, in the memory, the image signal received by the receiving means, in a case where a current frame is one that is located right before the at least one first frame in the scanning period and (ii) not writing, in the memory, the image signal received by the receiving means, in a case where the current frame is one that is located right before the at least one second frame in the pause period;
- reading means for reading out, from the memory, the image signal stored in the memory, in the at least one first frame in the scanning period;
- scanning signal output means for outputting each scanning signal to a corresponding one of the plurality of scanning lines, in the at least one first frame in the scanning period;
- and
- image signal output means for receiving the image signal read out by the reading means and outputting the image signal thus received to the plurality of data lines, in the at least one first frame in the scanning period.
A method of driving a display device which includes a display panel and a memory, the display panel including a plurality of scanning lines, a plurality of data lines which intersect with the plurality of scanning lines, and a plurality of pixels which are provided near respective intersections of the plurality of scanning lines and the plurality of data lines, the memory having a region in which an image signal is stored,
- the method comprising the steps of:
- (a) outputting a control signal which alternately designates (i) a scanning period in which a whole region on a screen of the display panel is scanned and which is constituted by at least one first frame and (ii) a pause period in which at least part of the region on the screen is not scanned and which is constituted by at least one second frame;
- (b) receiving, in each of the at least one first frame and the at least one second frame, the image signal supplied from outside of the display device;
- (c) (i) writing, in the memory, the image signal received in the step (b), in a case where a current frame is one that is located right before the at least one first frame in the scanning period and (ii) not writing, in the memory, the image signal received in the step (b), in a case where the current frame is one that is located right before the at least one second frame in the pause period;
- (d) reading out, from the memory, the image signal stored in the memory, in the at least one first frame in the scanning period;
- (e) outputting each scanning signal to a corresponding one of the plurality of scanning lines, in the at least one first frame in the scanning period;
- and
- (f) receiving the image signal read out in the step (d) and outputting the image signal thus received to the plurality of data lines, in the at least one first frame in the scanning period.
Dependencies are inferred from the claim text.