Amoled displays with multiple readout circuits

摘要

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.

主权项

1. A system for determining the current effective value of at least one parameter of selected pixels in an array of pixels in a display in which each pixel includes a light-emitting device, said pixels being arranged in multiple rows and columns, said system comprising
multiple readout circuits each of which is shared by multiple columns of pixels while still permitting the measurement of said at least one parameter independently for each of the individual pixels, and a controller coupled to said readout circuits and adapted to
measure the values of said at least one parameter of a first group of said selected pixels in a selected row with a first of said readout circuits,determine a curve fit for the values of said at least one parameter measured by said first readout circuit,measure the values of said at least one parameter of a second group of said selected pixels in said selected row, adjacent said first group of said selected pixels in said selected row, with a second of said readout circuits,determine a first value of said at least one parameter of the first pixel in said second group from said values measured with said second readout circuit,determine a second value of said at least one parameter of the first pixel in said second group from said curve fit,determine the difference between said first and second values of said at least one parameter of the first pixel in said second group, andadjust the values of said at least one parameter measured for said second group of said selected pixels with said second readout circuit, based on said difference between said first and second values of said at least one parameter of the first pixel in said second group.