SYSTEM AND METHODS FOR EXTRACTING CORRELATION CURVES FOR AN ORGANIC LIGHT EMITTING DEVICE
First Claim
1. A method for determining a characterization correlation curve for aging compensation for an organic light emitting device (OLED) based pixel in a display comprising:
- applying a first stress condition to a reference device;
storing a baseline optical characteristic and a baseline electrical characteristic of the reference device;
periodically measuring an output voltage based on a reference current to determine an electrical characteristic of the reference device;
periodically measuring the luminance of the reference pixel to determine an optical characteristic of the reference device;
determining a characterization correlation curve corresponding to the first stress condition based on the baseline optical and electrical characteristics and the determined electrical and optical characteristics of the reference device; and
storing the characterization correlation curve corresponding to the first stress condition.
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Accused Products
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. Characterization correlation curves for other predetermined stress conditions are also stored based on application of the predetermined stress conditions on other reference pixels. 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 the curves of the predetermined stress conditions.
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Citations
30 Claims
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1. A method for determining a characterization correlation curve for aging compensation for an organic light emitting device (OLED) based pixel in a display comprising:
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applying a first stress condition to a reference device; storing a baseline optical characteristic and a baseline electrical characteristic of the reference device; periodically measuring an output voltage based on a reference current to determine an electrical characteristic of the reference device; periodically measuring the luminance of the reference pixel to determine an optical characteristic of the reference device; determining a characterization correlation curve corresponding to the first stress condition based on the baseline optical and electrical characteristics and the determined electrical and optical characteristics of the reference device; and storing the characterization correlation curve corresponding to the first stress condition. - View Dependent Claims (2, 3, 5, 6, 7, 12, 13, 15)
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4. (canceled)
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8-11. -11. (canceled)
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14. (canceled)
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16. A display system for compensating of aging effects, the display system comprising:
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a plurality of active pixels displaying an image, the active pixels each including a drive transistor and an organic light emitting diode (OLED); a memory storing a first characterization correlation curve for a first predetermined stress condition and a second characterization correlation curve for a second predetermined stress condition; and a controller coupled to the plurality of active pixels, the controller determining a stress condition on one of the active pixels, the stress condition falling between the first and second predetermined stress conditions, and determining a compensation factor to apply to a programming voltage based on the characterization correlation curves of the first and second stress conditions. - View Dependent Claims (17, 21, 22)
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18-20. -20. (canceled)
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23. A method of determining a characterization correlation curve for an OLED device in a display, the method comprising:
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storing a first characterization correlation curve based on a first group of reference pixels at a predetermined high stress condition; storing a second characterization correlation curve based on a second group of reference pixels at a predetermined low stress condition; determining a stress level of an active pixel falling between the high and low stress conditions; determining a compensation factor based on the stress on the active pixel, the compensation factor based on the stress on the active pixel and the first and second characterization correlation curve; and adjusting a programming voltage to the active pixel based on the characterization correlation curve. - View Dependent Claims (24, 25, 26, 27)
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28. A display system for compensating for aging effects, the display system comprising:
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a plurality of active pixels displaying an image, the active pixels each including a drive transistor and an organic light emitting diode (OLED); a memory storing a first characterization correlation curve for a first predetermined stress condition and a second characterization correlation curve for a second predetermined stress condition; and a controller coupled to the plurality of active pixels, the controller determining a stress condition of a selected one of the active pixels, the stress condition falling between the first and second predetermined stress conditions, and determining a compensation factor to apply to a programming voltage for said selected active pixel, based on a weighted moving average of said first and second characterization correlation curves of said first and second predetermined stress conditions. - View Dependent Claims (29, 30)
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Specification