AMOLED displays with multiple readout circuits
First Claim
1. A system for determining the operational voltage VOLED of a light-emitting device in a pixel in an array of pixels in a display, the pixel including a storage capacitor coupled to a drive transistor for supplying current to said light-emitting device as a function of a programming of the storage capacitor, the system comprising:
- a controller adapted to;
vary a first programming of the storage capacitor and measure a first current supplied to said light-emitting device via said drive transistor, until reaching a final first programming of the storage capacitor when the first current equals a predetermined current, wherein one of the first current and the predetermined current is a function of the operational voltage VOLED of said light-emitting device; and
extract the value of the operational voltage VOLED of said light-emitting device with use of the final first programming of the storage capacitor.
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Accused Products
Abstract
The OLED voltage of a selected pixel is extracted from the pixel produced when the pixel is programmed so that the pixel current is a function of the OLED voltage. One method for extracting the OLED voltage is to first program the pixel in a way that the current is not a function of OLED voltage, and then in a way that the current is a function of OLED voltage. During the latter stage, the programming voltage is changed so that the pixel current is the same as the pixel current when the pixel was programmed in a way that the current was not a function of OLED voltage. The difference in the two programming voltages is then used to extract the OLED voltage.
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Citations
18 Claims
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1. A system for determining the operational voltage VOLED of a light-emitting device in a pixel in an array of pixels in a display, the pixel including a storage capacitor coupled to a drive transistor for supplying current to said light-emitting device as a function of a programming of the storage capacitor, the system comprising:
a controller adapted to; vary a first programming of the storage capacitor and measure a first current supplied to said light-emitting device via said drive transistor, until reaching a final first programming of the storage capacitor when the first current equals a predetermined current, wherein one of the first current and the predetermined current is a function of the operational voltage VOLED of said light-emitting device; and extract the value of the operational voltage VOLED of said light-emitting device with use of the final first programming of the storage capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of determining the operational voltage VOLED of a light-emitting device in a pixel in an array of pixels in a display, the pixel including a storage capacitor coupled to a drive transistor for supplying current to said light-emitting device as a function of a programming of the storage capacitor, the method comprising:
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varying a first programming of the storage capacitor and measuring a first current supplied to said light-emitting device via said drive transistor, until reaching a final first programming of the storage capacitor when the first current equals a predetermined current, wherein one of the first current and the predetermined current is a function of the operational voltage VOLED of said light-emitting device; and extracting the value of the operational voltage VOLED of said light-emitting device with use of the final first programming of the storage capacitor. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification