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Method and apparatus for controlling a multigradation display

  • US 5,252,959 A
  • Filed: 07/27/1992
  • Issued: 10/12/1993
  • Est. Priority Date: 02/20/1989
  • Status: Expired due to Term
First Claim
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1. A multi-gradation display comprising:

  • display means comprising a field of dots formed in a matrix for displaying an image,a plurality of parallel signal electrodes and a plurality of scan electrodes formed in orthogonal directions relative to each other, the cross points of said electrodes defining said field of dots,scan electrode driving means having a plurality of scan signal output terminals for sequentially supplying scan signals to respective scan electrodes,signal electrode driving means for selectively supplying data signals to respective signal electrodes,electrode driving means for activating selected dots to form said image across said matrix field of dots,said matrix field of dots divided into a plurality of defined virtual submatrices of different two dimensional size and forming a predetermined gradation pattern of N activated or nonactivated dots distributed within each of said defined virtual submatrices, each of said virtual submatrices having at least a different number of rows of dots in one of said orthogonal directions compared with other of said virtual submatrices,said electrode driving means comprising;

    gradation data encoder means for designating a particular gradation for the display of the image,dot submatrix generating means comprising a plurality of submatrix generating circuits for respectively generating one of said virtual submatrices with said predetermined gradation pattern of N activated or nonactivated dots,output gate means for applying data signals for creating an activated dot gradation per respective submatrix addressed by said electrode driving means based upon on outputs of said gradation data encoder means and said dot submatrix generating means.

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