| 摘要 |
<p>An optical exposure system for a color video printer, comprising a microprocessor for controlling optical exposure for R, G and B video signals, a memory device for storing the R, G and B video signals by the frame, a drive control device for inputting R, G and B video data from the memory device and outputting signal voltages and gate voltages of fixed levels as drive control signals for optical exposure of a photosensitive medium, and a LCD panel for performing the optical exposure of the photosensitive medium in response to the drive control signals from the drive control device. The gradation number of exposure amount is determined by fixing levels of the signal voltages to fix transmitivities of R, G and B liquid crystal elements and determining the number of exposure times by R, G and B pixels to be proportioned respectively to the R, G and B data values. Therefore, gradations of colors to be printed by the color video printer can be increased in number so that sensitivity differences among R, G and B colors can be compensated for and visually-natural colors can be reemerged.</p> |
