Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-03-21
1997-06-17
Garber, Wendy
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 98, G09G 336
Patent
active
056401736
ABSTRACT:
The invention identifies the cause of and solves so-called display pattern splicing in passive matrix displays implemented with Active Addressing.TM. techniques or other techniques that produce column signals having more than one magnitude. Splicing is an optical aberration that is manifested by a transient pixel rms voltage deviation from a current, frame-averaged value that occurs when one image changes to a new one. Active solutions to display pattern splicing apply a correction of some type to counteract the effects of the transient optical response. Preferred active solutions are premised on the observation that splicing is an effect common to all pixels on a column. One type of active solution includes different embodiments that entail determining the amplitude and character of the display pattern splice and introducing a compensating signal as a function of the amplitude and character of the splice to counteract it. One embodiment modifies the column signal values applied to the column electrodes, and another embodiment adds correction time intervals to a frame period to adjust the rms voltages of the column signals applied during the frame period.
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Clifton Benjamin R.
Leybold William J.
Prince Dennis W.
Garber Wendy
In Focus Systems, Inc.
Rives LLP Stoel
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