Hughes-jvc Technology Corporation

Hughes Aircraft Company

Other

Rodney D Sterling

Javier A Ruiz

Robert A Edwards

Jack H Schmidt

Craig P Stephens

John Jeffrey Lyon

John P Sheppard

Yu-Tai Lee

Robert D TeKolste

Roger Hollister

Joseph M Haggerty

Graeme D Gow

Ned Nestorovic

Chun-Pang Li

David G Jackson

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.

Automatic shading in an LCLV projector

An optical system is provided that has an enclosure which is substantially filled with a fluid. The enclosure also has an aperture for receiving an electromagnetic wave that is altered by an optical component contained in the enclosure. The enclosure also has an aperture mask and blocker that are at least partially immersed in the fluid.

Internal aperture mask for embedded optics

In a liquid crystal light valve projector, a quarter-wave compensator plate is disposed between a polarization plate and a liquid crystal light valve to compensate for polarization irregularities induced by the off-incident reflections in the cone of light projected onto the LCLV. The quarter-wave compensation plate reverses the phase of the P component of said illumination light with respect to said compensator plate by 180.degree. thereby eliminating P-polarization leakage during the dark state of an LCLV projector. The invention also combines the compensator plate with a heat shield and a low stress-optical coefficient counter electrode substrate to reduce the birefringence of the LCLV thereby also minimizing leakage of P-polarized light onto the projection screen during the dark state of the projector.

Liquid crystal light valve projector with improved contrast ratio and

A reflective liquid crystal light valve includes transparent conductive layers of indium tin oxide (30) employed as an electrode to electrically modulate orientation of molecules of a liquid crystal material that receives a high intensity reading light (40) applied through the transparent electrode. Unwanted double reflection (64,66) from interfaces between the indium tin oxide electrode (30) and adjacent layers (22,32) are minimized by application of broad band anti-reflective coatings (70,72,74,76) formed by one or more pairs of thin layers having alternately high and low indices of refraction.

Liquid crystal light valve with minimized double reflection

A liquid crystal light valve that has an indium tin oxide (ITO) primary electrode disposed between two silicon dioxide bonding layers. The first bonding layer for bonding the primary electrode to a glass substrate and the second bonding layer for bonding said primary electrode to a hydrogenated amorphous silicon layer. The ITO primary electrode is sputtered which significantly reduces processing time and the silicon dioxide bonding layers allow the primary electrode to be bonded to the glass substrate and the hydrogenated amorphous silicon layer without peeling. For some applications the silicon dioxide bonding layer between the glass substrate and the primary electrode is not necessary.

Silicon dioxide bonding layers and method

A liquid crystal light valve projection system is provided with increased optical overshoot, and thereby decreased optical response time, by employing a liquid crystal mixture (52) having molecules substantially perpendicularly aligned to the face of the liquid crystal light valve electrodes (42,70) and axially twisted. The axial twist of the liquid crystal molecules is provided by laying down alignment grooves (90,92,96,98) for the liquid crystal mixture that are oriented with respect to one another, on the opposite alignment layers, by an angle of between about 45.degree. and 90.degree.. This mutually angled orientation of the opposed alignment grooves on the opposed alignment layers causes optical overshoot of the system to vary when the entire liquid crystal cell (34) is rotated relative to the output polarizer (18) about an axis perpendicular to the output face of the cell. This rotation of the cell (34) of twisted perpendicular liquid crystal relative to the output polarizer (18) allows a faster optical rise time to be achieved.

Light valve with twisted perpendicular liquid crystal with a negative

A LCLV device exhibiting improved performance capabilities fabricated using an amorphous silicon photoconductor layer, a cadmium telluride blocking layer, a titanium dioxide mirror and a sepcial bonding layer which enables attachment of the cadmium telluride blocking layer to the amorphous silicon. The bonding layer includes silicon dioxide sputtered in successive argon and argon/oxygen atmospheres followed by cadmium telluride sputtered in successive argon/oxygen and argon atmospheres. The bonding layer may also be used in other applications to bond a cadmium telluride layer to single crystal silicon or silicon dioxide layers.

Growing community of inventors

Carlsbad, CA, United States of America

Rodney D Sterling