Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1996-02-05
1998-03-31
Tung, Kee M.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
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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Seiko Epson Corporation
Tung Kee M.
Watson Mark P.
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