Patent ID: 9111485
Filing Date: 2015-08-18
Classification: G06T,G09G,H04N

Abstract:
1. A method of maintaining a substantially constant display white point over an extended period of operation of a color display formed by an array of multiple pixels, each of said pixels including multiple subpixels having different colors and white, and each of said subpixels including a light emissive device, said method comprising receiving a video signal, controlling the color of a selected pixel by adjusting relative levels of energization of the subpixels in the selected pixel based on the video signal, determining a color shift degradation behavior based on aging of a white subpixel in the selected pixel, and re-adjusting the relative levels of energization of at least one of the color subpixels in the selected pixel to adjust brightness shares of said subpixels in said selected pixel to compensate for said color shift degradation, due to aging, of said white subpixel independently of other pixels in said array and based on said determined color shift degradation behavior of said white subpixel based on aging, said brightness shares being adjusted to maintain a substantially constant display white point, and in which said controlling is carried out according to a lookup table mapping the video signal to the relative levels of energization of the subpixels and in which said adjusting is carried out by dynamically adjusting the lookup table based on the determined color shift degradation behavior based on aging.