Mixed mode grayscale method for display system
AssigneeDuke University
InventorsSangrok Lee, Kristina M. Johnson
Life of this patent
Estimating the term…
Abstract
A method for generating a grayscale representation for a display combines analog and digital techniques to produce images of optimal quality. The grayscale representation is not limited by frame frequency compared to digital techniques and not limited by small voltage differences between pixel electrodes. In the method, a frame is first divided into sub-frames of most significant bits and least significant bits. The sub-frame time can either be weighted or uniform. An analog voltage is then applied to the sub-frames to produce a reduced grayscale. The number of sub-frames and the brightness are two parameters that can be optimized for a best possible display result.
Claims24
A method of generating a mixed grayscale representation for a display system, comprising:
- (a) dividing a frame of digital display data into a plurality of sub-frames;
- (b) determining illumination intensities for the plurality of sub-frames;
- (c) generating analog grayscale voltages for the digital data in each of the sub-frames based on the illumination intensities;
- and
- (d) displaying an image on the display system based on the generated analog grayscale voltages, wherein the generating step includes computing a voltage difference ΔV by dividing a maximum analog pixel voltage V with a grayscale G, and generating the analog grayscale voltages from the digital data based on the voltage difference ΔV.
A system for generating a mixed grayscale representation, comprising:
- a divider configured to divide a frame of digital display data into a plurality of sub-frames;
- a first controller configured to determine illumination intensities for the plurality of sub-frames;
- a voltage generator configured to generate an analog grayscale voltage for the digital data in each of the sub-frames based on the illumination intensities;
- and
- a display system configured to display an image based on the analog grayscale voltage generated for each of the sub-frames, wherein the voltage generator computes a voltage difference ΔV by dividing a maximum analog pixel voltage V with a grayscale G and generates the analog grayscale voltages from the digital data based on the voltage difference ΔV.
Dependencies are inferred from the claim text.