Leonid I Shapiro DeceasedSan Diego, CA

5225875, Jul 6, 1993

Sep 21, 1990

7/586506

Leonid Shapiro - Lakeside CA
Randall S. Farwell - San Diego CA
Robert Shaw - Escondido CA

Proxima Corporation - San Diego CA

G09G 504

340703

A high speed color display system including a modulation circuit electrically coupled between a high speed display device, such as an active matrix liquid crystal display panel, and a video output signal source, such as a video output card of a personal computer. The modulation circuit including both a scaling circuit for eliminating or substantially reducing contouring caused by quantizing errors associated with approximations of digital pictures and a duty cycle scaling circuit for eliminating or substantially reducing repetitive beats in a displayed image.

5453803, Sep 26, 1995

May 12, 1994

8/243062

Leonid Shapiro - Lakeside CA
David W. Kappel - San Diego CA

Proxima Corporation - San Diego CA

G03B 2128

353119

A low profile liquid crystal projector unit, and a novel method of using it to project a liquid crystal image with substantially no keystoning effects. An optics arrangement directs high intensity light within the housing along an irregularly shaped light path extending angularly through an angularly inclined liquid crystal display panel offset by an angle. lambda. relative to the normal axis plane of the display panel to help reduce image keystoning. An output mirror mounted above the housing is inclined angularly opposite to the liquid crystal display panel and cooperates with a lens set for projecting reflectively a liquid crystal image, formed by the display panel, onto a remote surface. The output mirror is mounted to reflect the liquid crystal image upwardly at an angle. theta. to the normal axis plane of the remote viewing surface, where the angle. lambda.

5504501, Apr 2, 1996

Jul 18, 1994

8/276568

Lane T. Hauck - San Diego CA
Leonid Shapiro - Lakeside CA

Proxima Corporation - San Diego CA

G09G 508

345158

An optical input arrangement and method includes an optical device for sensing a projected image and for detecting the presence of a high intensity optical input signal light by discriminating it from the entire projected image and the ambient light reflecting from a viewing surface. A determination is made as to when the differences in intensity of sequentially measured pixel intensity values of the light reflected from the viewing surface exceeds a positive threshold amount and substantially immediately thereafter decreases more than a negative threshold amount, to facilitate an even more precise discrimination between the input signal image and the overall projected image. An alignment device generates an optical signal for facilitating the alignment of the arrangement to capture the entire image reflecting from the viewing surface.

5302946, Apr 12, 1994

Aug 7, 1991

7/741584

Leonid Shapiro - Lakeside CA
William K. Bohannon - San Diego CA
Randall S. Farwell - San Diego CA

G09G 336

345 88

A new display panel system includes a stacked display panel and drive units therefor. The drive units include a computer for adjusting for the individual gamma characterics of each one of the display panels for color balancing purposes and for causing the luminance of each panel to be maximized, or at least greatly increased for each intensity level or shading of each color.

5298892, Mar 29, 1994

Apr 16, 1991

7/686751

Leonid Shapiro - Lakeside CA
William K. Bohannon - San Diego CA
Randall S. Farwell - San Diego CA

Proxima Corporation - San Diego CA

G09G 3363

340784

A new display panel system includes a stacked display panel and drive units therefor. The drive units include a computer for adjusting for the individual gamma characterics of each one of the display panels for color balancing purposes and for causing the luminance of each panel to be maximized, or at least greatly increased for each intensity level or shading of each color.

5517263, May 14, 1996

Jul 25, 1994

8/279943

Arthur P. Minich - San Diego CA
Leonid Shapiro - Lakeside CA

Proxima Corporation - San Diego CA

G03B 2128

353 31

An image projection system includes a bright light source of polarized light, and in one form of the invention, a spatial light modulator, having an alignment layer, to modulate the polarized projection light, wherein the bright polarized light source is aligned with the alignment layer to permit the polarized light to pass therethrough without the need for unwanted light blocking polarizers. The spatial light modulator generates output light representative of the image, which is projected by a projection lens system onto a remote viewing surface to form a bright image thereon. In another form of the invention, three different colored images are each produced by three separate polarized light sources illuminating three individual light valves, and are superimposed to produce a full color image while all three light sources are maintained fully activated to provide a brightly illuminated image.

5062001, Oct 29, 1991

Apr 11, 1990

7/507630

Randall S. Farwell - San Diego CA
Lane T. Hauck - San Diego CA
Leonid Shapiro - Lakeside CA

Proxima Corporation - San Diego CA

H04N 574

358236

An image is projected in gray scale on a large screen without any flicker, the different colors or shades being indicated on the screen by individual shades of gray. The image is defined by a plurality of pixels which are raster scanned. At each pixel position, a plurality of first digital signals are generated each representing an individual primary color (e. g. red, green and blue) or shade in the image at the position. Second digital signals individually representing such different colors or shades are also produced on a pseudo-random basis -e. g. by producing video clocked signals not only at the pixel positions but also during the horizontal and vertical retraces. The second signals are repetitively counted to a particular value to correspond to successive frames in the video image. In each successive frame, the first signals are compared in value with the second signals at each individual pixel position. A video signal is produced for generating the image for that pixel on the large screen only when the first signals for each pixel in a raster scan have a greater digital significance than, or an equal significance to, the second signals for that pixel in that raster scan.

5815229, Sep 29, 1998

Aug 22, 1996

8/701495

Leonid Shapiro - Lakeside CA

Proxima Corporation - San Diego CA

G02F 11335
G02F 11343

349 95

A liquid crystal projection panel construction includes an incident light substrate assembly spaced apart from an light exiting substrate assembly having a plurality of pixel elements for enclosing a liquid crystal assembly therebetween. The incident light substrate assembly includes a microlens array having a plurality of microlenses disposed at about a surface of engagement between the incident light substrate assembly and the liquid crystal assembly for converging light through corresponding pixel elements. The incident light substrate assembly further includes a plurality of interference filters disposed at about the surface of engagement, and in registration with the corresponding microlenses and pixel elements for projecting a bright, high quality, full color image.