Driving system for active-matrix displays
First Claim
1. A method of using raw grayscale image data representing images to be displayed in a plurality of successive frames, to drive a display having a plurality of pixels that include a drive transistor and an organic light emitting device, said method comprising:
- dividing each frame into at least a long sub-frame and a short sub-frame, a time period of the long sub-frame being greater than a time period of the short sub-frame;
determining which of a plurality of predetermined grayscale value ranges a raw grayscale value for a pixel during a frame falls within; and
supplying the pixel with drive currents during each of the long sub-frame of the frame and the short sub-frame of the frame based upon said determined grayscale value range,wherein the drive current supplied to the pixel during the long sub-frame is greater than the drive current supplied to the pixel during the short sub-frame when the determined grayscale value range is a first predetermined range of grayscale values.
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Accused Products
Abstract
Raw grayscale image data, representing images to be displayed in successive frames, is used to drive a display having pixels that include a drive transistor and an organic light emitting device by dividing each frame into at least first and second-frames, and supplying each pixel with a drive current that is higher in the first sub-frame than in the second sub-frame for raw grayscale values in a first preselected range, and higher in the second sub-frame than in the first sub-frame for raw grayscale values in a second preselected range. The display may be an active matrix display, such as an AMOLED display.
595 Citations
20 Claims
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1. A method of using raw grayscale image data representing images to be displayed in a plurality of successive frames, to drive a display having a plurality of pixels that include a drive transistor and an organic light emitting device, said method comprising:
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dividing each frame into at least a long sub-frame and a short sub-frame, a time period of the long sub-frame being greater than a time period of the short sub-frame; determining which of a plurality of predetermined grayscale value ranges a raw grayscale value for a pixel during a frame falls within; and supplying the pixel with drive currents during each of the long sub-frame of the frame and the short sub-frame of the frame based upon said determined grayscale value range, wherein the drive current supplied to the pixel during the long sub-frame is greater than the drive current supplied to the pixel during the short sub-frame when the determined grayscale value range is a first predetermined range of grayscale values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for using raw grayscale image data representing images to be displayed in a plurality of successive frames, to drive a display having a plurality of pixels that each include a drive transistor and an organic light emitting device, multiple select lines coupled to said array for delivering signals that select when each pixel is to be driven, and multiple data lines for delivering drive signals to the selected pixels, said apparatus comprising:
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a source driver coupled to said data lines and including a processing circuit for receiving said raw grayscale image data and adapted to; divide each frame into at least a long sub-frame and a short sub-frame, a time period of the long sub-frame being greater than a time period of the short sub-frame; determine which of a plurality of predetermined grayscale value ranges a raw grayscale value for a pixel during a frame falls within; and program the pixel for each of the long sub-frame of the frame and the short sub-frame of the frame based upon said determined grayscale value range for supplying the pixel with drive currents based upon said determined grayscale value range, wherein the drive current supplied to the pixel during the long sub-frame is greater than the drive current supplied to the pixel during the short sub-frame when the determined grayscale value range is a first predetermined range of grayscale values. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification