IMAGE DISPLAY APPARATUS AND SCROLL CONTROL METHOD AND SCROLL CONTROL PROGRAM FOR IMAGE DISPLAY APPARATUS, ELECTRONIC EQUIPMENT HAVING IMAGE DISPLAY APPARATUS

摘要

PROBLEM TO BE SOLVED: To achieve a high speed lateral scroll by means of DMAC without using a highly functional LCD controller.

SOLUTION: An image display apparatus includes: a display section; a VRAM; a reduced image forming section which generates reduced image data of size that allows a reduced image to be displayed on a display section from a plurality of image data; the DMA controller that rotates the arrangement of input data and transfers the rotated arrangement of input data based on a control register which instructs to rotate the arrangement of data 90° to the right or left; a scroll buffer including storage areas where an m number of the reduced image data can be disposed in each line with the reduced image data rotated 90° to the right; an operating section that indicates the start position of the scroll buffer to be transferred to the VRAM; a right rotation transfer section that successively transfers reduced image data to the scroll butter by means of the DMA controller whose control register has been set at 90° on the right side; and a left rotation transfer section that transfers a predetermined amount of data to the VRAM from the start position of the scroll butter by means of the DMA controller whose control register has been set at 90° on the left side.

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