Patent ID: 7973781

Claim:
An image display device with a two-modulation optical system for displaying an image corresponding to input image signals, the image display device comprising: a first optical modulation element for turning on or off pixels every subfield in a unit of plane, a second optical modulation element for displaying gradation of the pixels in a unit of line, the first optical modulation element and the second optical modulation element being arranged optically in series, a second optical modulation element drive unit for driving the second optical modulation element in a line-sequential manner; and a first optical modulation element drive unit for generating a control signal for a present frame for concurrently controlling all of pixels in the unit of plane in lines disposed to correspond to a unit of single or several lines of the line-sequential driving of the second modulation element with a driving interval in the unit of single or several lines and controlling the first optical modulation element in synchronism with the unit of single or several lines, wherein the control signal is constructed to include a first control signal corresponding to a gradation control of subfields in a previous frame and a second control signal corresponding to a gradation control of subfields in the present frame, and for each of the lines corresponding to the unit of single or several lines, a proportion of the first control signal to the second control signal in the control signal corresponds to a time delay of the second optical modulation elements with respect to the first optical modulation element drive unit.