Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1990-10-15
1993-09-14
Oberley, Alvin E.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345 99, 345 89, G09G 300
Patent
active
052453286
ABSTRACT:
A method and apparatus are disclosed which provide a means for both spatially and temporarily resolving the on/off states of a two-state display device such as a liquid crystal display to provide apparent shades of gray. A particular feature of this method is that the cycling between on and off states is not performed in a single, repetitive pattern. Rather, a pattern is utilized which repeats only after many cycles. Additionally, when the 10 method disclosed herein is utilized, adjacent pixels, when selected to display the same shade of gray, do not cycle on and off in synchronization, but rather utilize out-of-phase cycling patterns. This spatial resolution reduces perceived flicker in the display and provides a more stable image. In one embodiment, sixteen shades of gray are provided. The shades are generated by cycling individual pixels such that when averaged over time, the duty cycles of such cycling are 0, 1/9, 1/7, 1/5, 2/7, 1/3, 2/5, 7/15, 8/15, 3/5, 2/3, 5/7, 4/5, 6/7, 8/9 and 1.
REFERENCES:
patent: 4531160 (1985-07-01), Ehn
patent: 4808991 (1989-02-01), Tachiuchi et al.
patent: 4827255 (1989-05-01), Ishii
Compaq Computer Corporation
Oberley Alvin E.
Wu Xiao M.
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