# US 5,706,062 A · Projector system including keystone correction > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,706,062 A - Document ID: US5706062A - Status: Granted - Kind: A - Application number: 08/178,024 - Filed: 1994-01-06 - Granted: 1998-01-06 - Earliest claimed: 1993-06-20 - Assignees: Unic View Ltd. - Inventors: Adi Stolov - Web page: https://patentgrep.com/patent/US5706062A ## CPC - H04N 9/3185: {Geometric adjustment, e.g. keystone or convergence (optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14)} - G03B 21/10: Projectors with built-in or built-on screen - G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)} - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - 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) ## Abstract A projector for use with a light source and including a shutter assembly having a multiplicity of pixel light valves and a color separator disposed intermediate the light source and the shutter assembly and spaced therefrom and providing a plurality of spatially separated differently colored light beams, wherein the plurality of spatially separated differently colored light beams are in predetermined registration with the multiplicity of pixel light valves. ## Claims ### Claim 1 A projector for use with a light source and comprising: a shutter assembly having a multiplicity of pixel light valves; a color separator disposed intermediate the light source and the shutter assembly and spaced therefrom and providing a plurality of spatially separated differently colored light beams; and a focusing lens assembly including a Fresnel lens and a compound lens which are tilted towards each other; wherein the plurality of spatially separated differently colored light beams are in predetermined registration with the multiplicity of pixel light valves, and wherein said focusing lens assembly and said shutter assembly are each independently tiltably mounted. ### Claim 2 A projection system comprising: projector for use with a light source and comprising: a shutter assembly having a multiplicity of pixel light valves; a color separator disposed intermediate the light source and the shutter assembly and providing a plurality of spatially separated differently colored light beams; and a focusing lens assembly including a Fresnel lens and a compound lens which are tilted towards each other; and a screen arranged in light receiving relationship with the projector and including a plurality of light impingement regions having different color characteristics, and wherein the plurality of spatially separated differently colored light beams are in predetermined registration with the multiplicity of pixel light valves, and the plurality of spatially separated differently colored light beams are arranged in predetermined registration with said plurality of light impingement regions having different color characteristics, and said focusing lens assembly and said shutter assembly are each independently tiltably mounted. ### Claim 3 (depends on 1) Apparatus according to claim 1 and wherein said color separator comprises a color filter array. ### Claim 4 (depends on 2) Apparatus according to claim 2 and wherein said color separator comprises a color filter array. ### Claim 5 (depends on 1) Apparatus according to claim 1 and wherein said color separator comprises an array of prisms. ### Claim 6 (depends on 2) Apparatus according to claim 2 and wherein said color separator comprises an array of prisms. ### Claim 7 (depends on 1) Apparatus according to claim 1 and wherein said color separator comprises an array of prism/lens combinations. ### Claim 8 (depends on 2) Apparatus according to claim 2 and wherein said color separator comprises an array of prism/lens combinations. ### Claim 9 (depends on 1) Apparatus according to claim 1 and wherein said color separator comprises a color filter array and an array of prism/lens combinations. ### Claim 10 (depends on 2) Apparatus according to claim 2 and wherein said color separator comprises a color filter array and an array of prism/lens combinations. ### Claim 11 (depends on 7) Apparatus according to claim 7 and wherein said array of prism/lens combinations comprise an array of prism/cylindrical lens combinations. ### Claim 12 (depends on 8) Apparatus according to claim 8 and wherein said array of prism/lens combinations comprise an array of prism/cylindrical lens combinations. ### Claim 13 A projector for use with a light source and comprising: a shutter assembly having a multiplicity of pixel light valves; color separator comprising an array of prism/lens combinations disposed intermediate the light source and the shutter assembly and providing a plurality of spatially separated differently colored light beams; and a focusing lens assembly including a Fresnel lens and a compound lens which are tilted towards each other; wherein the plurality of spatially separated differently colored light beams are in predetermined registration with the multiplicity of pixel light valves, and wherein said focusing lens assembly and said shutter assembly are each independently tiltably mounted. ### Claim 14 (depends on 1) Apparatus according to claim 1 further comprising an upstream selective light absorber disposed intermediate the light source and the shutter assembly and spaced therefrom. ### Claim 15 (depends on 2) Apparatus according to claim 2 further comprising an upstream selective light absorber disposed intermediate the light source and the shutter assembly and spaced therefrom. ### Claim 16 (depends on 13) Apparatus according to claim 13 further comprising an upstream selective light absorber disposed intermediate the light source and the shutter assembly and spaced therefrom. ### Claim 17 A projector for use with a light source and comprising: a shutter assembly having a multiplicity of pixel light valves; an upstream selective light absorber disposed intermediate the light source and the shutter assembly and spaced therefrom; and a focusing lens assembly including a Fresnel lens and a compound lens which are tilted towards each other; wherein said focusing lens assembly and said shutter assembly are each independently tiltably mounted. ### Claim 18 (depends on 17) Apparatus according to claim 17 and also comprising a downstream selective light absorber disposed downstream of the shutter assembly and spaced therefrom. ### Claim 19 (depends on 17) Apparatus according to claim 17 and wherein said selective light absorber is a polarizer. ### Claim 20 (depends on 17) Apparatus according to claim 17 and wherein said selective light absorber is a color filter array. ### Claim 21 (depends on 1) Apparatus according to claim 1 and wherein said shutter assembly comprises a liquid crystal display panel. ### Claim 22 (depends on 2) Apparatus according to claim 2 and wherein said shutter assembly comprises a liquid crystal display panel. ### Claim 23 (depends on 13) Apparatus according to claim 13 and wherein said shutter assembly comprises a liquid crystal display panel. ### Claim 24 (depends on 17) Apparatus according to claim 17 and wherein said shutter assembly comprises a liquid crystal display panel. ### Claim 25 (depends on 21) Apparatus according to claim 21 and wherein said liquid crystal display is a black and white liquid crystal display panel. ### Claim 26 (depends on 21) Apparatus according to claim 21 and wherein said liquid crystal display is a color liquid crystal display panel. ### Claim 27 (depends on 1) Apparatus according to claim 1 and also comprising a source of collimated light. ### Claim 28 (depends on 2) Apparatus according to claim 2 and also comprising a source of collimated light. ### Claim 29 (depends on 13) Apparatus according to claim 13 and also comprising a source of collimated light. ### Claim 30 (depends on 17) Apparatus according to claim 17 and also comprising a source of collimated light. ### Claim 31 (depends on 1) Apparatus according to claim 1 and also comprising a source of noncollimated light. ### Claim 32 (depends on 2) Apparatus according to claim 2 and also comprising a source of noncollimated light. ### Claim 33 (depends on 13) Apparatus according to claim 13 and also comprising a source of noncollimated light. ### Claim 34 (depends on 17) Apparatus according to claim 17 and also comprising a source of noncollimated light. ### Claim 35 (depends on 2) Apparatus according to claim 2 and also comprising a focusing lens assembly. ### Claim 36 (depends on 13) Apparatus according to claim 13 and also comprising a focusing lens assembly. ### Claim 37 (depends on 1) Apparatus according to claim 1 and constituting an overhead projection system. ### Claim 38 (depends on 2) Apparatus according to claim 2 and constituting an overhead projection system. ### Claim 39 (depends on 13) Apparatus according to claim 13 and constituting an overhead projection system. ### Claim 40 (depends on 17) Apparatus according to claim 17 and constituting an overhead projection system. ### Claim 41 (depends on 1) Apparatus according to claim 1 and constituting a rear projection system. ### Claim 42 (depends on 2) Apparatus according to claim 2 and constituting a rear projection system. ### Claim 43 (depends on 13) Apparatus according to claim 13 and constituting a rear projection system. ### Claim 44 (depends on 17) Apparatus according to claim 17 and constituting a rear Projection system. ### Claim 45 (depends on 1) Apparatus according to claim 1 and constituting a forward reflective projection system. ### Claim 46 (depends on 2) Apparatus according to claim 2 and constituting a forward reflective projection system. ### Claim 47 (depends on 13) Apparatus according to claim 13 and constituting a forward reflective projection system. ### Claim 48 (depends on 17) Apparatus according to claim 17 and constituting a forward reflective projection system. ### Claim 49 (depends on 1) Apparatus according to claim 1 and constituting an angled rear projection system. ### Claim 50 (depends on 2) Apparatus according to claim 2 and constituting an angled rear projection system. ### Claim 51 (depends on 13) Apparatus according to claim 13 and constituting an angled rear projection system. ### Claim 52 (depends on 17) Apparatus according to claim 17 and constituting an angled rear projection system. ### Claim 53 (depends on 1) Apparatus according to claim 1 wherein said focusing lens assembly and said shutter assembly are mounted in different planes at a tilt relative to each other. ### Claim 54 (depends on 2) Apparatus according to claim 2 wherein said focusing lens assembly and said shutter assembly are mounted in different planes at a tilt relative to each other. ### Claim 55 (depends on 13) Apparatus according to claim 13 wherein said focusing lens assembly and said shutter assembly are mounted in different planes at a tilt relative to each other. ### Claim 56 (depends on 17) Apparatus according to claim 17 wherein said focusing lens assembly and said shutter assembly are mounted in different planes at a tilt relative to each other. ### Claim 57 A projector for use with a light source and comprising: a shutter assembly having a multiplicity of pixel light valves; a color separator disposed intermediate the light source and the shutter assembly and spaced therefrom and providing a plurality of spatially separated differently colored light beams; and a focusing lens assembly including a Fresnel lens and a compound lens which are tilted towards each other; wherein the plurality of spatially separated differently colored light beams are in predetermined registration with the multiplicity of pixel light valves, and wherein said focusing lens assembly and said shutter assembly are mounted in different planes at a tilt relative to each other. ### Claim 58 A projection system comprising: a projector for use with a light source and comprising: a shutter assembly having a multiplicity of pixel light valves; a color separator disposed intermediate the light source and the shutter assembly and providing a plurality of spatially separated differently colored light beams; and a focusing lens assembly including a Fresnel lens and a compound lens which are tilted towards each other; and a screen arranged in light receiving relationship with the projector and including a plurality of light impingement regions having different color characteristics, and wherein the plurality of spatially separated differently colored light beams are in predetermined registration with the multiplicity of pixel light valves, and the plurality of spatially separated differently colored light beams are arranged in predetermined registration with said plurality of light impingement regions having different color characteristics, and said focusing lens assembly and said shutter assembly are mounted in different planes at a tilt relative to each other. ### Claim 59 A projector for use with a light source and comprising: a shutter assembly having a multiplicity of pixel light valves; a color separator comprising an array of prism/lens combinations disposed intermediate the light source and the shutter assembly and providing a plurality of spatially separated differently colored light beams; and a focusing lens assembly including a Fresnel lens and a compound lens which are tilted towards each other; wherein the plurality of spatially separated differently colored light beams are in predetermined registration with the multiplicity of pixel light valves, and wherein said focusing lens assembly and said shutter assembly are mounted in different planes at a tilt relative to each other. ### Claim 60 A projector for use with a light source and comprising: a shutter assembly having a multiplicity of pixel light valves; an upstream selective light absorber disposed intermediate the light source and the shutter assembly and spaced therefrom; and a focusing lens assembly including a Fresnel lens and a compound lens which are tilted towards each other; wherein said focusing lens assembly and said shutter assembly are mounted in different planes at a tilt relative to each other.