The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 1998
Filed:
May. 17, 1993
Robin S Han, Saratoga, CA (US);
Cirrus Logic, Inc., Fremont, CA (US);
Abstract
Shaded or color images are simulated using frame modulation techniques on flat panel displays having an array of binary display elements, i.e., display elements that have only two display states, an ON state and an OFF state. The timing of ON/OFF and OFF/ON state transitions of picture elements within predetermined neighborhoods through the array of display elements is coordinated such that the state transitions occur substantially uniformly in space and time during a multi-frame display sequence. Using a multi-frame sequence 16 frames in duration, 16 shades of gray may be realized on a monochrome display. The number of shades may be increased to 64 using dynamic dithering. Dithering is applied by causing the multi-frame sequence to be 64 frames in duration and dividing the multi-frame sequence into four sub-sequences each 16 frames in duration with the duty cycle of each display element during each of the four 16-frame sub-sequences being allowed to assume one of two adjacent values only such that display noise is minimized. The method may be applied to color displays in which pixel locations have illumination elements each of a different color, for example a red illumination element, a green illumination element and a blue illumination element.