# US 8,783,873 B2 · Image system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,783,873 B2 - Document ID: US8783873B2 - Status: Granted - Kind: B2 - Application number: 13/249,847 - Filed: 2011-09-30 - Published: 2012-04-05 - Granted: 2014-07-22 - Earliest claimed: 2010-09-30 - Assignees: Palomar Display Products, Inc. - Applicants: Chris Weinold; Richard O'Hara; Gary L. Timmerman; Jeffrey A. Kovell - Inventors: Chris Weinold; Richard O'Hara; Gary L. Timmerman; Jeffrey A. Kovell - Web page: https://patentgrep.com/patent/US8783873B2 ## CPC - G03B 21/62: Translucent screens - G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)} - G03B 21/10: Projectors with built-in or built-on screen - H04N 9/3155: {for controlling the light source (light source control per se H05B35/00 – H05B47/00; control of an illumination source for displays in general G09G3/3406)} - H04N 9/3194: {including sensor feedback} - G02B 5/02: Diffusing elements; Afocal elements - G02B 5/30: Polarising elements (light-modulating devices with active elements G02F1/00) - G02B 23/18: for binocular arrangements {(focusing binocular pairs G02B7/06; adjusting pupillary distance of binocular pairs G02B7/12)} - G02B 2027/0112: {comprising device for genereting colour display} - G02B 2027/0147: {comprising a device modifying the resolution of the displayed image} - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract Provided is an electronic image display and control system comprising in various embodiments a microdisplay video projector that projects a high quality color image from a non-CRT image source onto a diffused but transmissive optical projection screen that is optically coupled with and viewable through a biocular adapted to this purpose. Systems are disclosed that are adapted to be mechanically coupled with a user to prevent relative movement between the biocular and the user, for instance in tactical applications. Closed-loop control electronics are provided for automatically controlling the brightness and chromaticity of the image. ## Claims ### Claim 1 An electronic image display system comprising: a microdisplay video projector that projects a color image from a non-CRT image source onto a diffused but transmissive optical projection screen that is optically coupled with and viewable through a biocular. ### Claim 2 (depends on 1) The electronic image display system of claim 1, wherein the microdisplay video projector comprises: a projector illumination source comprising: a RGB LED lighting system; circuitry that drives the RGB LED lighting system; a condenser lens that processes light emanating from the RGB LED lighting system; and a scattering screen that diffuses light provided by RGB LED lighting system. ### Claim 3 (depends on 1) The electronic image display system of claim 1, wherein the microdisplay video projector comprises a projector illumination source and the following optical components that process light that has emanated from the projector illumination source: a collection lens; a pre-polarizer; a polarizing beam splitter; a quarter wave plate; and a post-polarizer. ### Claim 4 (depends on 1) The electronic image display system of claim 1, further comprising closed-loop control electronics that automatically control the brightness of the color image. ### Claim 5 (depends on 1) The electronic image display system of claim 1, further comprising closed-loop control electronics that automatically control the chromaticity of the color image. ### Claim 6 (depends on 1) The electronic image display system of claim 1, wherein the microdisplay video projector comprises: an LCOS reflective microdisplay; and electronic circuitry connected with and that drives the LCOS reflective microdisplay. ### Claim 7 (depends on 1) The electronic image display system of claim 1, wherein the microdisplay video projector comprises: a DMD reflective microdisplay; and electronic circuitry connected with and that drives the DMD reflective microdisplay. ### Claim 8 (depends on 1) The electronic image display system of claim 1, wherein the microdisplay video projector comprises: an FLCOS reflective microdisplay; and electronic circuitry connected with and that drives the FLCOS reflective microdisplay. ### Claim 9 (depends on 1) The electronic image display system of claim 1, wherein the microdisplay video projector comprises a microdisplay comprising one or more transmissive light valves. ### Claim 10 (depends on 1) The electronic image display system of claim 1, wherein the microdisplay video projector comprises an optical expansion and focusing cell that comprises a relay lens that projects an expanded and focused image on the diffused but transmissive optical projection screen. ### Claim 11 (depends on 1) The electronic image display system of claim 1, wherein the diffused but transmissive optical projection screen is formed at least in part from PTFE. ### Claim 12 (depends on 1) The electronic image display system of claim 1, wherein the diffused but transmissive optical projection screen is formed at least in part from acetal copolymer film. ### Claim 13 (depends on 1) The electronic image display system of claim 1, wherein the diffused but transmissive optical projection screen is formed at least in part from polymer dispersed liquid crystal. ### Claim 14 (depends on 1) The electronic image display system of claim 1, wherein the electronic image display system is adapted to mechanically couple the biocular with a user. ### Claim 15 (depends on 14) The electronic image display system of claim 14, wherein the electronic image display system is adapted to mechanically couple the biocular with a user by comprising compliant material positioned between the biocular and the head of the user when viewing an image presented by the biocular. ### Claim 16 An electronic image display system comprising: a direct-view display that is optically coupled with and viewable through a biocular that is adapted to be mechanically coupled with a user, the biocular comprising an image input aperture having a predetermined location; wherein the electronic image display system presents an appropriately sized and focused color image from the direct-view display to the predetermined location such that the user can view the image when the user is mechanically coupled with the biocular. ### Claim 17 (depends on 16) The electronic image display system of claim 16 wherein the electronic image display system presents the appropriately sized and focused color image from the direct-view display to a user without projecting the image on a diffused but transmissive optical projection screen. ### Claim 18 An electronic image display system comprising: microdisplay video projector means for projecting a color image onto a diffused but transmissive optical projection screen that is optically coupled with and viewable through biocular means. ### Claim 19 (depends on 18) The electronic image display system of claim 18 further comprising: means for mechanically coupling a user with the biocular means. ### Claim 20 (depends on 18) The electronic image display system of claim 18 further comprising: closed-loop control means for controlling the brightness or chromaticity of the color image.