Hardware that rotates an image for portrait-oriented display

Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements

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Details

395501, 395517, 395137, 345126, 382297, G06F 1206

Patent

active

057348758

ABSTRACT:
A system for translating a portrait-oriented software address to a portrait-oriented yet landscape-configured display address. The system includes a central processing unit (CPU), a display device and an address translation system. The CPU generates a software address. Based on the orientation of the display device, the address translation system either passes the software address "as is" or translates the address to represent a portrait-oriented display address. The address translation system translates according to the functions L=ln(H.sub.D)/ln 2 and M=ln(W.sub.D)/ln 2, wherein H.sub.D is the landscape-oriented display device pixel height and W.sub.D is the landscape-oriented display device pixel width. L represents the number of least significant software address bits to translate as most significant physical address bits, and M represents the number of most significant software address bits to invert and translate as least significant physical address bits. The resulting address represents a pixel location on the display device which has been rotated counter-clockwise ninety degrees for portrait orientation.

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patent: 5606348 (1997-02-01), Chin

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