Patent ID: 6888517
Filing Date: 2005-05-03
Classification: G09G

Abstract:
1. A dot display type video display apparatus displaying an image having a first frame frequency at a second frame frequency that is lower than said first frame frequency, said video display apparatus comprising: a synchronization signal generation circuit for generating a synchronization signal of said second frame frequency; a conversion frequency detector for calculating a number of frames making up an unit block at each of said frame frequencies and a number of frames to be thinned based on said first frame frequency and said second frame frequency; a frame memory for storing a first frame having said first frame frequency; a difference detector for comparing intensity data of each dot on said video display apparatus of a second frame which is currently input to said video display apparatus with intensity data of each dot of said first frame which is stored in said frame memory and which is immediately before said second frame, and detecting a difference between said two frames; a difference adder for counting a number of dots for a case in which said difference of said intensity data detected by said difference detector is greater than a prescribed value; a movement detection/judgment section for distinguishing whether or not a count value detected by said difference adder is below a prescribed value and outputting a signal indicating that thinning of said second frame is possible, when said count value of said difference adder is below said prescribed value; and a frame thinning section for thinning said second frame, in a case in which said signal indicating that frame thinning of said second frame is possible is output from said movement detection/judgment section and also a signal indicating that said number of frames to be thinned is output from said conversion frequency detector.