Patent ID: 7982693

Claim:
An organic light emitting diode (OLED) display apparatus, comprising: (a) means for detecting the amount of high frequency components of a target pixel of a color image to be displayed, wherein the color image includes an input RGB signal for each of a plurality of pixels; (b) means for calculating a respective conversion coefficient between 0 and 1 for the target pixel in accordance with the result of the detection and the spatial position of the pixel; (c) means for converting the input RGB signals for the target pixel to RGBW signals for that pixel using the respective conversion coefficient; and (d) a plurality of pixels each having a R (red), a G (green), a B (blue), and a W (white) dot for producing light in response to the corresponding RGBW signals, so that when the conversion coefficient for a pixel is less than 1, the R, G, B and W dots in the pixel all emit light simultaneously, wherein the conversion coefficient determines a usage ratio of the W dot.