Patent ID: 6144354
Filing Date: 2000-11-07
Classification: G09G

Abstract:
An image display apparatus having:an image display unit in which pixels electrically connected to a plurality of data signal lines and to a plurality of scanning signal lines are arrayed in a matrix form; andscanning signal line selection means for supplying said scanning signal lines with scanning signals for successively selecting said scanning signal lines,said apparatus driving said pixels by applying voltages to the pixels in accordance with said data signals and said scanning signals while inverting the polarities of the voltages applied to the pixels, said apparatus comprising:phase expansion means supplied with a first video signal having serial pixel data for driving said pixels by voltages having a first polarity, and with a second video signal having serial pixel data for driving said pixels by voltages having a second polarity, said phase expansion means forming, from said first and second video signals, m (where m is an integer equal to or larger than 2) phase-expanded signals expanded into pixel data by extending the data length of items of said pixel data corresponding to some of said pixels periodically selected, said phase expansion means outputting the phase-expanded signals to phase-expanded signal output lines in parallel with each other, wherein said phase expansion means has m sample and hold sections connected to said m phase-expanded signal output lines, said first video signal being constantly input to one of two groups of said sample and hold sections during a frame period, said second video signal being constantly input to the other group of said sample and hold sections during the frame period;signal supply means for supplying said pixel data to said plurality of data lines on the basis of said m phase-expanded signals input via m signal supply lines;connection change means for changing connections between said m phase-expanded signal output lines and said m signal supply lines; andchange control means for controlling change of the order of expansion into said in phase-expanded signals performed by said phase expansion means, and a combination of connections changed by said connection change means by linking the combination to said expansion order,wherein said change control means performs change control so that an expansion order first set with respect to the preceding frame is changed to a different expansion order in synchronization with vertical synchronization.