AMOLED displays with multiple readout circuits
First Claim
1. A system for determining the current effective voltage VOLED of a light-emitting device in a selected pixel in an array of pixels in a display, the selected pixel including a drive transistor for supplying current to said light-emitting device, said light-emitting device emitting light when supplied with the voltage VOLED, the system comprising:
- a controller adapted to;
repeatedly vary a first programming voltage of the selected pixel to supply a first current to said light-emitting device via said drive transistor and measure said first current, until the first current equals a predetermined current, wherein at least one of the first current and the predetermined current is a function of the current effective voltage VOLED of said light-emitting device; and
extract the value of the current effective voltage VOLED of said light-emitting device with use of a value of the first programming voltage.
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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.
569 Citations
16 Claims
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1. A system for determining the current effective voltage VOLED of a light-emitting device in a selected pixel in an array of pixels in a display, the selected pixel including a drive transistor for supplying current to said light-emitting device, said light-emitting device emitting light when supplied with the voltage VOLED, the system comprising:
a controller adapted to; repeatedly vary a first programming voltage of the selected pixel to supply a first current to said light-emitting device via said drive transistor and measure said first current, until the first current equals a predetermined current, wherein at least one of the first current and the predetermined current is a function of the current effective voltage VOLED of said light-emitting device; and extract the value of the current effective voltage VOLED of said light-emitting device with use of a value of the first programming voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of determining the current effective voltage VOLED of a light-emitting device in a selected pixel in an array of pixels in a display, the selected pixel including a drive transistor for supplying current to said light-emitting device, said light-emitting device emitting light when supplied with the voltage VOLED, the method comprising:
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repeatedly varying a first programming voltage of the selected pixel to supply a first current to said light-emitting device via said drive transistor and measuring said first current, until the first current equals a predetermined current, wherein at least one of the first current and the predetermined current is a function of the current effective voltage VOLED of said light-emitting device; and extracting the value of the current effective voltage VOLED of said light-emitting device with use of a value of the first programming voltage. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification