Projection display device with negative feedback loop to correct

Details Projection display device with negative feedback loop to correct Projection display device with negative feedback loop to correct

1991-03-21

1993-07-27

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 64, 358 10, H04N 931

Patent

active

052314812

ABSTRACT:
A projection display device is provided with a negative feedback chain designed to correct all the faults of the projected image, said faults resulting as much from the projection tubes and from their optic systems (geometrical or focusing faults) as from the differences between these tubes (faults in convergence, colorimetry or uniformity of brilliance). The negative feedback chain comprises a test chart generating means, a means to retake the entire projected image and means for the comparision of the signals coming from the test image and from the retaken image. Correction signals are prepared on the basis of this comparison and are applied to the different control circuits defining the projection characteristics. The disclosed device can also be used for the real-time follow-up of the adjustments obtained in a phase prior to the projection of the sequence of useful video images. The invention can be applied notably to video projectors, retro-projection display devices or beam-index tubes.

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