System and methods for extracting correlation curves for an organic light emitting device
First Claim
1. A method for compensating of aging effects in a display system comprising a plurality of organic light emitting diode (OLED) based pixels configured to display images, the method comprising:
- storing, in a computer-readable non-transitory memory device, a first characterization correlation curve for a first stress condition and a second characterization correlation curve for a second stress condition, said first and second characterization correlation curves obtained using one or more reference devices;
determining a stress condition on one or more of the OLED based pixels resulting from operation of the display system;
determining a compensation factor based on the determined stress condition and the characterization correlation curves of the first and second stress conditions; and
adjusting a programming voltage or current to the one or more OLED based pixels configured to display images based on the compensation factor.
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Abstract
A system and method for determining and applying characterization correlation curves for aging effects on an organic light organic light emitting device (OLED) based pixel is disclosed. A first stress condition is applied to a reference pixel having a drive transistor and an OLED. An output voltage based on a reference current is measured periodically to determine an electrical characteristic of the reference pixel under the first predetermined stress condition. The luminance of the reference pixel is measured periodically to determine an optical characteristic of the reference pixel. A characterization correlation curve corresponding to the first stress condition including the determined electrical and optical characteristic of the reference pixel is stored. The stress condition of an active pixel is determined and a compensation voltage is determined by correlating the stress condition of the active pixel with curves of the predetermined stress conditions.
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Citations
20 Claims
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1. A method for compensating of aging effects in a display system comprising a plurality of organic light emitting diode (OLED) based pixels configured to display images, the method comprising:
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storing, in a computer-readable non-transitory memory device, a first characterization correlation curve for a first stress condition and a second characterization correlation curve for a second stress condition, said first and second characterization correlation curves obtained using one or more reference devices; determining a stress condition on one or more of the OLED based pixels resulting from operation of the display system; determining a compensation factor based on the determined stress condition and the characterization correlation curves of the first and second stress conditions; and adjusting a programming voltage or current to the one or more OLED based pixels configured to display images based on the compensation factor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A display system configured for compensating of aging effects, comprising:
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a plurality of pixels configured to display images, each said pixel comprising an organic light emitting diode (OLED); a memory configured to store one or more characterization correlation curves for one or more pixel stress conditions; and a controller coupled to the plurality of pixels, the controller configured to determine a stress condition on one of active pixels of the plurality of pixels, and to determine a compensation factor for a programming voltage or current based on the at least one of the one or more characterization correlation curves. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method for compensating of aging effects in a display system comprising a plurality of organic light emitting diode (OLED) based pixels configured to display images, the method comprising:
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performing measurements on one or more reference devices under one or more reference stress conditions to obtain one or more characterization correlation curves, wherein the one or more reference devices are not part of the plurality of OLED based pixels configured to display images; determining a stress condition on one of the OLED pixels resulting from displaying images during operation of the display system, determining a compensation factor to apply to a programming voltage or current of one or more OLED pixels from the plurality of the OLED pixels based on the one or more characterization correlation curves, and adjusting the programming voltage or current to the one or more OLED pixels based on the compensation factor.
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Specification