Automatic shading in an LCLV projector

Details Automatic shading in an LCLV projector Automatic shading in an LCLV projector

1997-10-10

2000-05-09

Lee, Michael H.

Television

Video display

Projection device

348191, 348658, H04N 3223, H04N 928

Patent

active

060611022

ABSTRACT:
A process for implementing shading corrections in a video projector. The process selects a color to be shaded, and then sets a projector video level at a selected high video level. A target brightness map is then generated for each of a plurality of preselected shading correction application points at the selected high video level. The process sets the projector video level at a selected low video level, and generates a target brightness map for each of the plurality of shading correction application points at the low video level. Actual light levels are then measured at both the high and low video levels for each shading correction application point, and differences between the target and measured brightness values are minimized. The shading process of the present invention is automatically preformed during projector set-up, and thereby eliminates the inherent subjective and time consuming need for conventional manual shading processes.

REFERENCES:
patent: 5231481 (1993-07-01), Eouzan et al.
patent: 5268775 (1993-12-01), Zeidler
patent: 5298985 (1994-03-01), Tsujihara et al.
patent: 5345262 (1994-09-01), Yee et al.
patent: 5532764 (1996-07-01), Itaki

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