Patent ID: 7995020
Filing Date: 2011-08-09
Classification: G09G

Abstract:
1. Display apparatus comprising: a display panel comprising electron-emitting elements of cold cathode electron source type driven through a plurality of row and column lines as pixels arranged in a matrix form; an input unit adapted to input a video signal from an external video source, an image processing unit adapted to transform the video signal to a luminance data for luminously driving respective pixels through the column lines so as to be adaptable to the specifications of the display panel; a memory in response to the luminance data for temporarily storing the luminance data for pixels; a calculation unit, responsive to the luminance data for calculating a correction value for the luminance data, wherein the calculation unit defines a plurality of blocks each of which includes a plurality of column lines and a plurality of periods divided in one horizontal scanning period, and wherein for each of subperiods divided in one horizontal scanning period, the calculation unit calculates a voltage drop in the subperiod to generate the correction value for a respective one of the plurality of blocks according to calculated voltage drops in respective ones of the subperiods, the calculation unit calculates the voltage drop in the subperiod based on a formula that is a function of a resistance value of a respective one of the row lines and currents estimated to flow through the column lines in the plurality of blocks during the subperiod when the luminance data is applied by way of the respective row line to the column drive unit for driving all of the column lines during one horizontal scanning period, and a circuit adapted to combine the temporarily stored luminance data of each of the row lines of the respective one of the plurality of blocks with the correction value generated for that block by using adder, to produce the corrected luminance data for each of the row lines of that block; a column line drive unit in response to the corrected luminance data for applying to each of the plurality of column lines a signal pulse of a width corresponding to the corrected luminance data; and a row line drive unit for sequentially selecting and scanning the plurality of row lines.