The patent's assignee is
News editors obtained the following quote from the background information supplied by the inventors: "The present invention is related an image signal processing method, and more particularly to a method of converting RGB gray levels to RGBW gray levels.
"With the advancement of display panel technologies, liquid crystal display (LCD) panels are widely used in portable devices such as laptops, tablet computers, and smart phones. In general, power consumption of the portable devices should be low so that the portable devices may operate over a long period of time without being charged. However, due to RGB (red, green, blue) LCD panels having low light penetration rate such that only 5.about.10% of light intensity from backlight penetrates panels, energy used for illuminating panels is not fully utilized. Thus pixels should be re-designed to increase light penetration rate so as to utilize energy more efficiently and reduce power consumption of panels.
"In contrast, RGBW (red, green, blue, white) LCD panels have higher light penetration rate and lower power consumption because white sub-pixels having higher light penetration rate are introduced into pixels. However, due to each sub-pixel (respectively being red, green, blue, white) of RGBW LCD panels occupying a smaller area than that of each sub-pixel of RGB LCD panels, images displayed on RGBW LCD panels are darker when the images are single colored (saturated color), and brightness may be too bright when RGBW LCD panels display all white images . Thus image quality of RGBW LCD panels may be poorer than RGB LCD panels."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "An embodiment of the present invention discloses an image processing method. The image processing method comprises providing a set of first RGB brightness levels of a set of pixels in a display panel. A set of saturation levels is generated according to the set of first RGB brightness levels. A set of mapping ratios is then generated according to the set of saturation levels and the set of first RGB brightness levels. A set of second RGB brightness levels is generated according to the set of first RGB brightness levels and a minimum mapping ratio of the set of mapping ratios and a set of brightness levels of white sub-pixels, where each brightness level of white sub-pixel is generated according to a minimum second RGB brightness level of second RGB brightness levels of each pixel is generated. A set of RGBW brightness levels is generated according to the set of second RGB brightness levels and the set of brightness levels of white sub-pixels. The set of RGBW brightness levels is converted to generate a set of RGBW gray levels of the set of pixels.
"These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
"FIG. 1 is a diagram illustrating a display panel having a plurality of dynamic backlight sectors.
"FIG. 2 is a diagram illustrating a dynamic backlight sector.
"FIG. 3 is a flowchart illustrating an image processing method according to an embodiment of the present invention.
"FIG. 4 is a diagram illustrating relationship between a saturation level and a brightness level.
"FIG. 5 is a flowchart illustrating a method of correcting the minimum mapping ratio by the backlight diffusion coefficient.
"FIG. 6 is a diagram illustrating a display panel having a plurality of dynamic backlight sectors."
For additional information on this patent application, see: Lin, Hui-Feng; Cheng, Sheng-Wen. Image Signal Processing Method. Filed
Keywords for this news article include: Electronics, Signal Processing,
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