Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1994-08-05
1997-06-17
Powell, Mark R.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
395515, 345185, 345189, 345199, 345150, G06F 1200, G06F 1206, G06F 1500
Patent
active
056405022
ABSTRACT:
In order to increase the speed of the transfer of control data to an OSD circuit, and to eliminate "holes" in memory caused by the use of memory mapped registers, dual use is made of the serial data port of the OSD circuit to accomplish two distinct tasks, serial transfer of graphics data and serial transfer of the control data. The on-screen display apparatus includes an OSD circuit for generating an graphics signal for display on a display screen, a controller coupled to the OSD circuit, for controlling the OSD circuit, and a VRAM including a first area for storing graphics data and a second area for storing control data for the OSD circuit. The VRAM has a parallel input/output port coupled to the controller and a serial output port coupled to the OSD circuit, the serial output port conveys the graphics data from the first area of the VRAM to the OSD circuit for processing and display. The controller writes the control data to the second area of the VRAM via the input/output port and the OSD circuit reads the control data from the VRAM via the serial output port during each vertical sync interval.
REFERENCES:
patent: 4799053 (1989-01-01), Van Aken et al.
patent: 5297271 (1994-03-01), Bhayani
patent: 5353402 (1994-10-01), Lau
patent: 5420609 (1995-05-01), Izzi et al.
Relevant pages of M68000 8-/16-/32-Bit Microprocessors User's Manual.
Apple II Reference Manual, Apple Computer, Inc, pp. 12, 13, 18-21, 68, 69, 130, 131.
Relevant pages of M5M482128AJ,TP,RT-7, -8, 10.
Dinwiddie Aaron Hal
Duffield David Jay
Filliman Paul Dean
Knox Michael Dwayne
Chauhan U.
Emanuel Peter M.
Lenihan Thomas F.
Powell Mark R.
Thomson Consumer Electronics Inc.
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