Window-dependent brightness/tint control for video digital-to-an

Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix

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Details

345153, G09G 514, G09G 504

Patent

active

056380909

ABSTRACT:
A display control circuit controls the outputs of the three video DACs of an RGB monitor on a window-to-window basis to enable the display of motion video and text on the same screen with different brightness and/or tint. A digital overdrive signal, synchronized to the video DAC digital inputs, is used to enable added DAC elements for the pixels in the video windows only. Stored digital instructions determine how many and which added DAC elements are enabled by the overdrive bit(s). By storing different instructions for each of the three video DACs, the circuit may also provide window-dependent tint control. By increasing the number of bits of digital data synchronized to the digital DAC inputs, the stored instructions may be reduced or eliminated. In this case, each of several windows may be set to differing brightness and tint levels. As many different values of brightness and tint may be available as desired by increasing the number of synchronized input enabling bits and the number and strength of the added DAC elements.

REFERENCES:
patent: 4855831 (1989-08-01), Miyamoto et al.
patent: 5442379 (1995-08-01), Bruce et al.

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