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

Claim 0:
1. 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 a first color subpixel, a second color subpixel, and a third color subpixel;
a color brightness calculation circuit coupled to the gray-to-luminance circuit and configured to calculate a rendered luminance value of each color 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 corresponding to the first RGB pixel comprises a first color subpixel, a second color subpixel, and a white subpixel, wherein the second display pixel corresponding to the second RGB pixel comprises a first color subpixel, a third color subpixel, and a white subpixel;
a luminance-to-gray circuit coupled to the color brightness calculation circuit and configured to receive the rendered luminance value of each subpixel of the display pixel set and correspondingly acquire a gray level value of each subpixel of the display pixel set; and
a HSV calculation circuit coupled to the color brightness calculation circuit and 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;
wherein the color brightness calculation circuit is further configured to acquire a first saturation gain according to the saturation value of the first RGB pixel and acquire a second saturation gain according to the saturation value of the second RGB pixel;
wherein a ratio of the rendered luminance values of the first color subpixel and the second color subpixel of the first display pixel is identical to a ratio between the luminance value of the first color subpixel of the first RGB pixel and a first sum of the luminance values of the second color subpixels of the first RGB pixel and the second RGB pixel, wherein a ratio of the rendered luminance values of the first color subpixel and the third color subpixel of the second display pixel is identical to a ratio between the luminance value of the first color subpixel of the second RGB pixel and a second sum of the luminance values of the third color subpixels of the first RGB pixel and the second RGB pixel.