Patent ID: 7209151
Filing Date: 2007-04-24
Classification: G09G

Abstract:
1. A display controller for producing a multi-gradation image on a display device formed by a plurality of binary-state pixels in an array through a plurality of consecutive frames, the plurality of binary-state pixels being classified into a plurality of pixel groups having an identical size, the display controller comprising: column addressing means for designating a column number of a desired pixel; row addressing means for designating a row number of the desired pixel; an image memory for providing gradation data in response to the column and row numbers of the desired pixel, the gradation data being indicative of a gradation level to be produced at the desired pixel; a waveform pattern memory for providing the display device with plural sets of waveform pattern signals, each set having an identical number of waveform pattern signals, each waveform pattern signal having a predetermined number of bits and producing a different gradation level when applied to a pixel, each bit being provided for displaying during a corresponding frame of the plurality of consecutive frames; and a waveform pattern selector for outputting a waveform pattern selecting signal in response to the column and row numbers of the desired pixel such that the waveform pattern memory provides two adjacent pixel groups with two different sets of the plural sets of waveform pattern signals, respectively, wherein: the waveform pattern memory determines a selected set of the plural sets of waveform pattern signals in response to the waveform pattern selecting signal, determines a selected waveform pattern signal of the selected set of waveform pattern signals in response to the gradation data, and provides the bits of the selected waveform pattern signal, one bit per frame, over the plurality of consecutive frames; the two different sets of the plural sets of waveform pattern signals provided for the two adjacent pixel groups, respectively, are so designed as to operate the two adjacent pixel groups at two different states during at least one frame of the plurality of consecutive frames; and the plurality of consecutive frames is displayed at a frame rate high enough for preventing visual disturbances.