# US 2014/0192331 A1 · Projector and method for controlling the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0192331 A1 - Document ID: US20140192331A1 - Status: Published application - Kind: A1 - Application number: 14/106,266 - Filed: 2013-12-13 - Published: 2014-07-10 - Earliest claimed: 2013-01-04 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Takashi TOYOOKA - Web page: https://patentgrep.com/patent/US20140192331A1 ## CPC - 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)} - G03B 21/006: {using LCD's} - G03B 21/2033: {LED or laser light sources} - G03B 21/2053: {Intensity control of illuminating light (controlled by video signal processing H04N5/74 or H04N9/31)} - G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)} - G03B 33/12: using beam-splitting or beam-combining systems, e.g. dichroic mirrors - H04N 9/3194: {including sensor feedback} - 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 includes a light detector that detects light brightness information on the brightness of light emitted from a light source and an adjuster that corrects the light brightness information detected with the light detector and adjusts the output from the light source based on the corrected light brightness information. ## Claims ### Claim 1 A projector comprising: a light detector that detects light brightness information on brightness of light emitted from a light source; and an adjuster that corrects the light brightness information detected with the light detector and adjusts an output from the light source based on the corrected light brightness information. ### Claim 2 (depends on 1) The projector according to claim 1, further comprising a temperature detector that detects temperature information representing temperature, wherein the adjuster corrects the light brightness information detected with the light detector based on the temperature information detected with the temperature detector and adjusts the output from the light source based on the corrected light brightness information. ### Claim 3 (depends on 2) The projector according to claim 2, wherein the light source includes a first light source and a second light source, the light detector includes a first light detector corresponding to the first light source and a second light detector corresponding to the second light source, the temperature detector includes a first temperature detector corresponding to the first light source and a second temperature detector corresponding to the second light source, and the adjuster corrects first light brightness information detected with the first light detector based on first temperature information detected with the first temperature detector, corrects second light brightness information detected with the second light detector based on second temperature information detected with the second temperature detector, and adjusts one or both of an output from the first light source and an output from the second light source based on the corrected first light brightness information and the corrected second light brightness information. ### Claim 4 (depends on 3) The projector according to claim 3, further comprising: a first light modulation device corresponding to the first light source; and a second light modulation device corresponding to the second light source, wherein the first light detector detects first light brightness information on brightness of light between the first light source and the first light modulation device, the second light detector detects second light brightness information on brightness of light between the second light source and the second light modulation device, the first temperature detector includes a first light source peripheral temperature detector that detects first light source peripheral temperature information representing temperature at a periphery of the first light source and a first light modulation device peripheral temperature detector that detects first light modulation device peripheral temperature information representing temperature at a periphery of the first light modulation device, and the second temperature detector includes a second light source peripheral temperature detector that detects second light source peripheral temperature information representing temperature at a periphery of the second light source and a second light modulation device peripheral temperature detector that detects second light modulation device peripheral temperature information representing temperature at a periphery of the second light modulation device. ### Claim 5 (depends on 4) The projector according to claim 4, wherein the first light source is a Y light source, the second light source is a B light source, and the first light detector and the first light modulation device peripheral temperature detector are provided in correspondence with one or both of R and G. ### Claim 6 (depends on 1) The projector according to claim 1, wherein the adjuster estimates light state information representing the state of the light emitted from the light source and adjusts the output from the light source based on the estimated light state information. ### Claim 7 (depends on 6) The projector according to claim 6, wherein the adjuster refers to the light brightness information detected with the light detector to estimate the light state information. ### Claim 8 (depends on 7) The projector according to claim 7, wherein the adjuster refers to the light brightness information detected with the light detector to estimate a change in the wavelength of the light and adjusts the output from the light source based on the estimated change in the wavelength of the light. ### Claim 9 (depends on 7) The projector according to claim 7, wherein the adjuster refers to the light brightness information detected with the light detector to estimate a change in the state of polarization of the light and adjusts the output from the light source based on the estimated change in the state of polarization of the light. ### Claim 10 (depends on 1) The projector according to claim 1, wherein the light detector detects light brightness information on brightness of light different from light to be projected on a screen. ### Claim 11 (depends on 10) The projector according to claim 10, further comprising a polarization separation element that separates the light incident from the light source into differently polarized light fluxes, wherein the light detector receives the light fluxes separated by the polarization separation element and detects light brightness information on brightness of the light different from the light to be projected on the screen. ### Claim 12 (depends on 6) The projector according to claim 6, further comprising a temperature detector that detects temperature information representing temperature, wherein the adjuster refers to the temperature information detected with the temperature detector to estimate the light state information. ### Claim 13 (depends on 6) The projector according to claim 6, further comprising a temperature detector that detects temperature information representing temperature, wherein the adjuster refers to the light brightness information detected with the light detector and the temperature information detected with the temperature detector to estimate the light state information. ### Claim 14 A method for controlling a projector, the method comprising: the procedure of causing a light detector to detect light brightness information on brightness of light emitted from a light source; and the procedure of causing an adjuster to correct the light brightness information detected with the light detector and adjust an output from the light source based on the corrected light brightness information.