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Display line drivers and method for signal propagation delay compensation

  • US 6,947,022 B2
  • Filed: 02/11/2002
  • Issued: 09/20/2005
  • Est. Priority Date: 02/11/2002
  • Status: Active Grant
First Claim
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1. A method of operating an LCD display, the LCD display including pixels arranged in an array of rows and columns, row driver circuitry including a plurality of row drivers, each of the plurality of row drivers being coupled to at least one row of pixels, the row driver circuitry applying a row enable signal to a selected one of the rows to enable the pixels within the selected row, and column driver circuitry including a plurality of column drivers, each of the plurality of column drivers being coupled to at least one column of pixels, for driving voltages onto the columns of the LCD display for storage in the pixels of the selected row, the columns of the LCD display including at least a first column located relatively proximate to the row driver circuitry and at least a second column located relatively distant from the row driver circuitry, the row enable signal being subject to a propagation delay as it is conducted along the selected row as measured between the first column and the second column, the method comprising the steps of:

  • a. applying the row enable signal to a first selected row of the LCD display via the row driver circuitry at a first predetermined time and for a predetermined duration;

    b. enabling a first column driver for applying a first driving voltage onto the first column of the LCD display at a second predetermined time and during said first predetermined duration to transfer the first driving voltage onto a first pixel located at an intersection of the first column with the first selected row;

    c. enabling a second column driver for applying a second driving voltage onto the second column of the LCD display at a third predetermined time and during said first predetermined duration to transfer the second driving voltage onto a second pixel located at an intersection of the second column with the first selected row; and

    d. delaying the third predetermined time beyond the second predetermined time by a delay that is approximately equal to the propagation delay but less than said first predetermined duration.

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