| 摘要 |
PROBLEM TO BE SOLVED: To provide an image display apparatus and an image compression method for displaying RGB 6bits each (total 18bits, 256K colors) by a frame buffer of RGB (red, green and blue) 565 (R=5bits, G=6bits and B=5bits total 16bits, 64K colors) without image quality degradation. SOLUTION: An RGB encoder A compresses dot data of images adjoining each other. A subtractor Sr, a subtractor Sg and a subtractor Sb output subtracted results of the data to an RGB encoder B and a format determining unit 913. The RGB encoder B compresses the data in a format different from that of the RGB encoder A according to the dot data and the subtracted results. The format determining unit 913 makes a data selector 914 select either an output signal of the RGB encoder A or an output signal of the RGB encoder B according to the subtracted results and write the selected signal in the frame buffer 92. An RGB decoder 931 expands data from the frame buffer 92 in accordance with the format. COPYRIGHT: (C)2005,JPO&NCIPI
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