Uniform active matrix oled displays
First Claim
Patent Images
1. An active matrix display, comprising:
- an array of pixels arranged in a plurality of columns and rows, each pixel including an organic light emitting device and a thin film transistor;
at least one readout line, each readout line connected to a plurality of the columns; and
a uniformity correction circuit connected to the at least one readout line, the uniformity correction circuit producing a selected pixel brightness on a pixel-by-pixel basis based on signals from the at least one readout line.
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Abstract
An active matrix display and method of driving the same is provided. The active matrix display comprises an array of pixels, each pixel including an organic light emitting device and at least one thin film transistor. A uniformity correction circuit that is capable of producing a selected pixel brightness is connected to the array of pixels. The uniformity correction circuit is capable of maintaining the brightness of the pixels in a range that does not vary, for example, by more than about 5-10% from their selected brightness values.
183 Citations
38 Claims
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1. An active matrix display, comprising:
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an array of pixels arranged in a plurality of columns and rows, each pixel including an organic light emitting device and a thin film transistor;
at least one readout line, each readout line connected to a plurality of the columns; and
a uniformity correction circuit connected to the at least one readout line, the uniformity correction circuit producing a selected pixel brightness on a pixel-by-pixel basis based on signals from the at least one readout line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An active matrix display, comprising:
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an array of pixels arranged in a plurality of columns, each pixel including an organic light emitting device and a thin film transistor;
a multiplexer having a plurality of inputs and at least one output, each input connected to one of the columns; and
a uniformity correction circuit connected to the at least one output of the multiplexer, the uniformity correction circuit producing a selected pixel brightness on a pixel-by-pixel basis based on signals from the multiplexer. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 38)
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37. A method of maintaining a selected pixel brightness on a pixel-by-pixel basis on an active matrix display, the active matrix display having the pixels arranged in a plurality of columns and rows, comprising:
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measuring current-voltage characteristics of pixels in the active matrix display through a readout line, the readout line connected to a plurality of the columns;
storing the current-voltage characteristics in a look-up table; and
using the current-voltage characteristics to select the voltage required to produce a selected pixel brightness for each pixel in the active matrix display; and
applying said voltage for each pixel in the active matrix display to the corresponding pixel in the display so as to produce a desired pixel brightness.
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Specification