Method of gray scale display for dot matrix type display device

Claim 1

A method for generating a gray scale display in a dot matrix type display device comprising the steps of: (a) dividing picture elements on a screen of the display device into a plurality of partitions, each partition having N number of picture elements and dividing each of said plurality of partitions into a plurality of picture element groups, each picture element group having at least N/4 number of picture elements, said picture elements corresponding to N degrees of the gray scale display in which a binary level signal is generated for each picture element to represent a lighting and non-lighting state; (b) setting each of the plurality of partitions to a desired degree of gray scale display, M; (c) generating a lighting pattern corresponding to the desired degree of gray scale display, M, for a plurality of frames, wherein the lighting pattern has M picture elements in the lighting state for each of the plurality of frames, wherein the lighting pattern varies for each picture element group for successive frames in the plurality of frames; (d) providing the lighting pattern to the plurality of partitions for the plurality of frames to produce the gray scale display; wherein the lighting pattern has an equal number of pixels in the lighting state for each of the plurality of pixel element groups over at most N/4 frames.

Claim 2

A method for generating a gray scale display in a dot matrix type display device comprising the steps of: (a) dividing picture elements on a screen of the display device into a plurality of partitions, each partition having N number of picture elements and dividing each of said plurality of partitions into a plurality of picture element groups, each picture element group having at least N/4 number of picture elements, said picture elements corresponding to N degrees of the gray scale display in which a binary level signal is generated for each picture element to represent a lighting and non-lighting state; (b) setting each of the plurality of partitions to a desired degree of gray scale display, M; (c) generating a lighting pattern corresponding to the desired degree of gray scale display, M, for a plurality of frames, wherein the lighting pattern has M picture elements in the lighting state for each of the plurality of frames, wherein the lighting pattern varies for each picture element group for successive frames in the plurality of frames; (d) providing the lighting pattern to the plurality of partitions for the plurality of frames to produce the gray scale display; wherein the lighting pattern has an equal number of pixels in the lighting state for each of the plurality of pixel element groups over at most N/4 frames.