Patent ID: 7884839

Claim:
A method of enhancing the gray scale resolution of a frame in a PWM system, the method comprising: defining an first N-bit PWM sequence with a length of 2 N −1 units, wherein the first N-bit PWM sequence includes a least significant bit (LSB) segment characterized by a temporal length of one unit, a first bit segment characterized by a temporal length of the LSB segment, a second bit segment characterized by a temporal length of 4 times the LSB segment, and a third bit segment characterized by a temporal length of 8 times the LSB segment; adding an additional bit segment of temporal length F to the first N-bit PWM sequence, wherein the additional bit segment has value of zero; forming a second PWM sequence characterized by a temporal length of 2 N −1+F; bit-splitting the second PWM sequence into a plurality of segments, each of the plurality of segments having a length equal to 4 times the length of the LSB segment, wherein the plurality of segments include: a first segment comprising the additional bit segment, the LSB segment, and the first bit segment; a second segment comprising the second bit segment; a third segment comprising a first portion of the third bit segment; and a fourth segment comprising a second portion of the third bit segment.