OLED luminance degradation compensation
First Claim
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1. A display for driving an array of a plurality of pixel circuits with a current compensated for luminance degradation, each of said pixel circuits having an electroluminescent device, the display comprising:
- a display panel comprising the array of pixel circuits, the pixel circuits arranged in at least one row and a plurality of columns;
a column driver for driving the electroluminescent devices in the pixel circuits with a driving current;
a base pixel including an electroluminescent device not driven by display currents;
a read block for determining a capacitance of an electroluminescent device of a pixel circuit and for determining a capacitance of an electroluminescent device of the base pixel; and
a control block for correlating a difference between the determined capacitances of the electroluminescent devices in the pixel circuit and the base pixel to a current correction factor for the electroluminescent device of the pixel circuit, and for controlling the operation of the column driver and the read block, the control block being operable to adjust the driving current based on the current correction factor, and to drive the electroluminescent device with the compensated drive current.
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Abstract
A system and method are disclosed for determining a pixel capacitance. The pixel capacitance is correlated to a pixel age to determine a current correction factor used for compensating the pixel drive current to account for luminance degradation of the pixel that results from the pixel aging.
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Citations
10 Claims
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1. A display for driving an array of a plurality of pixel circuits with a current compensated for luminance degradation, each of said pixel circuits having an electroluminescent device, the display comprising:
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a display panel comprising the array of pixel circuits, the pixel circuits arranged in at least one row and a plurality of columns; a column driver for driving the electroluminescent devices in the pixel circuits with a driving current; a base pixel including an electroluminescent device not driven by display currents; a read block for determining a capacitance of an electroluminescent device of a pixel circuit and for determining a capacitance of an electroluminescent device of the base pixel; and a control block for correlating a difference between the determined capacitances of the electroluminescent devices in the pixel circuit and the base pixel to a current correction factor for the electroluminescent device of the pixel circuit, and for controlling the operation of the column driver and the read block, the control block being operable to adjust the driving current based on the current correction factor, and to drive the electroluminescent device with the compensated drive current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification