Patent ID: 6747669
Filing Date: 2004-06-08
Classification: G09G

Abstract:
A gray scale modifying circuit for producing a series of frames each having plural lines on a screen of an image producing apparatus, comprising:an input port supplied with input video data signals grouped into plural sorts, each of said input video data signals having a first predetermined number of bits representative of a piece of image to be produced in one of the frames of said series; an output port outputting output video data signals corresponding to said input video data signals, respectively, each of said output video data signals having a second predetermined number of bits representative of the piece of image; a signal converter connected between said input port and said output port, and producing said output video data signals from said input video data signals and a control data signal representative of a piece of control data information; and a control signal generator producing said control data signal used in a gray scale modification from the input video data signals belonging to a group of the sorts selected from said plural sorts to the corresponding output video data signals, and varying said piece of control data information depending upon a pattern indicated by the combination of a first number assigned to each of said frames, a second number assigned to each of said lines and the sort selected from said group of sorts and assigned to one of said input video data signals to be converted.