Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1994-05-27
1995-10-24
Brier, Jeffery
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345141, 348589, G09G 540
Patent
active
054613981
ABSTRACT:
A method and circuit (30) for providing drive signals that have a half-tone and fast blanking capability to a video display (20) has a video preamplifier (31) integrated on a semiconductor substrate (35) for receiving an input video signal (14) and for producing an output drive signal (17) to the video display (20). The preamplifier (31) may have a plurality of channels (31', 31") corresponding to each color video signal to be processed. A halftone control circuit (21), also integrated on the semiconductor substrate (35) receives halftone control signals (60) and connected to reduce the drive signal produced by the video preamplifier (31). A fast blanking circuit (22) for receiving fast blanking control signals (80) is also integrated on the semiconductor substrate (35) and is connected to substantially turn off the drive signal produced by the video preamplifier (31). The preamplifier (31) is constructed with bipolar transistors and the halftone and fast blanking control circuits are constructed with MOS transistors, for example by a LinBiCMOS semiconductor manufacturing process. The preamplifier (31) may include a plurality of amplification stages, (40, 43-45, 48, 50) wherein the halftone control circuit (21) and the fast blanking control circuits (22) control a drive level prior to a last amplification stage (50) to enable low level control of the halftone and fast blanking operations.
REFERENCES:
patent: 5003303 (1991-03-01), Kellar et al.
Chiang Johnson
Chiu Timothy
Tang Y. W.
Brady III W. James
Brier Jeffery
Donaldson Richard L.
Swayze, Jr. W. Daniel
Texas Instruments Incorporated
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