US 11,955,043 B1
Apparatus for performing subpixel rendering of RGBW display panel
Tung Ying Wu, Tainan (TW)
Assigned to HIMAX TECHNOLOGIES LIMITED, Tainan (TW)
Filed by HIMAX TECHNOLOGIES LIMITED, Tainan (TW)
Filed on Sep. 21, 2022, as Appl. No. 17/933,858.
Int. Cl. G09G 3/20 (2006.01); G09G 5/06 (2006.01)
CPC G09G 3/2003 (2013.01) [G09G 5/06 (2013.01); G09G 2300/0443 (2013.01); G09G 2310/027 (2013.01); G09G 2360/16 (2013.01)] 16 Claims
OG exemplary drawing
 
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.