Method and apparatus for measuring illumination uniformity of a

Details Method and apparatus for measuring illumination uniformity of a Method and apparatus for measuring illumination uniformity of a

1995-09-25

1998-08-11

Powell, Mark R.

Television

Image signal processing circuitry specific to television

Color balance or temperature

345147, H04N 573

Patent

active

057934410

ABSTRACT:
A system for measuring the illumination uniformity of a liquid light value (LCLV) for a LCLV projector includes a projection device including a first LCLV. The projection device reflects light from the first LCLV to form an image on a screen. An image sensing device senses illumination values for a plurality portions of said image. A processor is coupled to the image sensing device and the projection device. The processor determines an optimum voltage bias which provides a maximum illumination for the plurality of image pixels. The illumination uniformity measuring system can independently measure the illumination non-uniformity of the LCLV and illumination non-uniformity resulting from other sources such as projection lens roll-off, screen gain, and other illumination non-uniformities. Using the measured illumination non-uniformity, a correction system can improve the quality of the displayed image.

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patent: 5416385 (1995-05-01), Hau
patent: 5530489 (1996-06-01), Henderson et al.
patent: 5537145 (1996-07-01), Miseli

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