Pixel circuits for AMOLED displays
First Claim
1. A method of determining characteristics of at least one circuit element of at least one selected pixel sharing a monitor line, said selected pixels in an array of pixels in a display in which each pixel includes a drive transistor for supplying current to an optoelectronic device of the pixel, the method comprising:
- controlling a biasing of a first number of selected pixels of the at least one selected pixel, each selected pixel including a second number of circuit elements of the at least one circuit element, the biasing including a biasing over a monitor line coupled to the first number of selected pixels, the controlling the biasing of the first number of selected pixels having a total number of degrees of freedom of biasing greater than or equal to the product of the first number multiplied by the second number; and
measuring with use of said monitor line at least one characteristic of the second number of circuit elements of the first number of selected pixels, while controlling a biasing of a first number of selected pixels, taking at least a number of measurements equal to the product of the first number multiplied by the second number.
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Accused Products
Abstract
A system for driving a display that includes a plurality of pixel circuits arranged in an array, each of the pixel circuits including a light emitting device and a driving transistor for conveying a driving current through the light emitting device. Methods of measuring characteristics of circuit elements of pixels sharing a monitor line include the control of biasing to selectively turn off circuit elements or render their response known while measuring other circuit elements of interest.
419 Citations
15 Claims
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1. A method of determining characteristics of at least one circuit element of at least one selected pixel sharing a monitor line, said selected pixels in an array of pixels in a display in which each pixel includes a drive transistor for supplying current to an optoelectronic device of the pixel, the method comprising:
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controlling a biasing of a first number of selected pixels of the at least one selected pixel, each selected pixel including a second number of circuit elements of the at least one circuit element, the biasing including a biasing over a monitor line coupled to the first number of selected pixels, the controlling the biasing of the first number of selected pixels having a total number of degrees of freedom of biasing greater than or equal to the product of the first number multiplied by the second number; and measuring with use of said monitor line at least one characteristic of the second number of circuit elements of the first number of selected pixels, while controlling a biasing of a first number of selected pixels, taking at least a number of measurements equal to the product of the first number multiplied by the second number. - View Dependent Claims (4, 5, 6, 7, 8)
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2. A method of determining the characteristics of circuit elements of at least one selected pixel in an array of pixels in a display in which each pixel includes a drive transistor for supplying current to an optoelectronic device of the pixel, the method comprising:
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controlling a biasing of a selected pixel of the at least one selected pixel, said biasing including adjusting a biasing of a gate of a selected drive transistor of the selected pixel until a specific current passes through a selected source switch coupling the selected pixel to a monitor line; controlling a biasing of a first pixel coupled to the monitor line via source and drain terminals of a first source switch such that the first source switch is biased with at least one of a zero voltage and a fixed known voltage across the source and the drain terminal of the first source switch resulting in a corresponding one of a zero current and a fixed known current passing through the first source switch, the monitor line shared with the selected pixel; and measuring at least one characteristic of at least one circuit element of said selected pixel with use of said monitor line. - View Dependent Claims (3, 9, 10, 11, 12, 13, 14, 15)
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Specification