Patent ID: 11955043
Assignee: HIMAX TECHNOLOGIES LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 15:
16. An apparatus for performing subpixel rendering of an RGBW display panel, comprising:
a gray-to-luminance circuit configured to receive an input gray level data and correspondingly acquire a luminance value of each subpixel of a RGB pixel set comprising a first RGB pixel and a second RGB pixel adjacent to each other, wherein each of the first RGB pixel and the second RGB pixel comprises red, green, and blue subpixels;
a HSV calculation circuit configured to receive the input gray level data and correspondingly acquire a saturation value of each of the first RGB pixel and the second RGB pixel;
a white brightness calculation circuit coupled to the gray-to-luminance circuit and the HSV calculation circuit and configured to calculate a rendered luminance value of each white subpixel of a display pixel set of the RGBW display panel, wherein the display pixel set comprises a first display pixel and a second display pixel adjacent to each other, wherein the first display pixel corresponds to the first RGB pixel and the second display pixel corresponds to the second RGB pixel, wherein each of the first display pixel and the second display pixel comprises a white subpixel and two of a red subpixel, a green subpixel, and a blue subpixel, wherein the display pixel set comprises red, green, blue, and white subpixels, wherein the rendered luminance value of the white subpixel of the first display pixel is determined according to the saturation value of the first RGB pixel and the luminance value of each subpixel of the first RGB pixel, wherein the rendered luminance value of the white subpixel of the second display pixel is determined according to the saturation value of the second RGB pixel and the luminance value of each subpixel of the second RGB pixel; and
a luminance-to-gray circuit coupled to the white brightness calculation circuit and configured to receive the rendered luminance value of each white subpixel of the display pixel set and correspondingly acquire a gray level value of each white subpixel of the display pixel set;
wherein a ratio of the rendered luminance values of the red subpixel and the green subpixel of the first display pixel is identical to a ratio between the luminance value of the red subpixel of the first RGB pixel and a first sum of the luminance values of the green subpixels of the first RGB pixel and the second RGB pixel, wherein a ratio of the rendered luminance values of the red subpixel and the blue subpixel of the second display pixel is identical to a ratio between the luminance value of the red subpixel of the second RGB pixel and a second sum of the luminance values of the blue subpixels of the first RGB pixel and the second RGB pixel.