# US 8,465,159 B2 · Projector and method of controlling a light source for use with the projector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,465,159 B2 - Document ID: US8465159B2 - Status: Granted - Kind: B2 - Application number: 13/401,677 - Filed: 2012-02-21 - Published: 2012-06-14 - Granted: 2013-06-18 - Earliest claimed: 2005-09-29 - Assignees: Casio Computer Co., Ltd. - Applicants: Masakuni Iwanaga - Inventors: Masakuni Iwanaga - Web page: https://patentgrep.com/patent/US8465159B2 ## CPC - G03B 21/43: Driving mechanisms - H04N 1/6088: {by viewing conditions, i.e. conditions at picture output} - 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 9/3164: {using multiple light sources} - H04N 9/3182: {Colour adjustment, e.g. white balance, shading or gamut (white balance per se H04N9/73; control of amplitude of colour signals H04N9/68; colour control circuits for displays in general G09G5/02, G09G3/2003, G09G3/3607)} - 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) - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A projector has a storage unit storing data on a plurality of different light emission patterns each occurring in a period based on a plurality of different-colored lights, wherein each light emission pattern corresponds to a respective one of a plurality of different projection conditions of a color image. An acquiring unit acquires a present projection condition of the color image, and a controller controls a light emission operation of the plurality of different-colored light emitting elements in the period in accordance with data on a light emission pattern corresponding to the present projection condition of the color image. ## Claims ### Claim 1 A projector apparatus that includes light emitting elements of red, blue, and green, and projects a color image in a field sequential color system, the projector apparatus comprising: a memory configured to store complementary color light emission pattern information and usual color light emission pattern information for a period of light emission by the light emitting elements, the complementary color light emission pattern information including one of a first duration in which only the light emitting elements of red and green simultaneously emit light, a second duration in which only the light emitting elements of green and blue simultaneously emit light, and a third duration in which only the light emitting elements of red and blue simultaneously emit light, and the usual color light emission pattern information including a duration other than the first duration, the second duration, and the third duration; an acquiring unit configured to acquire information indicative of whether color components of the color image include a complementary color component; a reading unit configured to read the complementary color light emission pattern information when the acquiring unit acquires information indicating that the color components of the color image comprise a complementary color component and to read the usual color light emission pattern information when the acquiring unit acquires information indicating that the color components of the color image do not comprise a complementary color component; and a controller configured to control a light emission pattern for a period of light emission by the light emitting elements based on the color light emission pattern information read by the reading unit. ### Claim 2 (depends on 1) The projector apparatus according to claim 1, wherein: the memory is configured to store first light emission pattern information as the complementary color light emission pattern information for a period of light emission by the light emitting elements, the first light emission pattern information comprising the first duration and not the second duration and the third duration; and the reading unit is configured to read the first light emission pattern information from the memory when the information acquired by the acquiring unit indicates that the color components of the color image include yellow as a complementary color component. ### Claim 3 (depends on 1) The projector apparatus according to claim 1, wherein: the memory is configured to further store second light emission pattern information as the complementary color light emission pattern information for a period of light emission by the light emitting elements, the second light emission pattern information comprising the first duration, the second duration, and the third duration; and the reading unit is configured to read the second light emission pattern information from the memory when the information acquired by the acquiring unit indicates that the color components of the color image include a complementary color component other than yellow. ### Claim 4 (depends on 1) The projector apparatus according to claim 1, wherein the first duration, the second duration, and the third duration are between fourth durations in which one of the light emitting elements emits light. ### Claim 5 (depends on 4) The projector apparatus according to claim 4, wherein the first duration, the second duration, and the third duration are shorter than the fourth durations. ### Claim 6 (depends on 1) The projector apparatus according to claim 1, wherein the complementary color light emission pattern information further comprises a fifth duration in which the light emitting elements of red, green, and blue simultaneously emit light. ### Claim 7 (depends on 6) The projector apparatus according to claim 6, further comprising: a second acquiring unit configured to acquire a luminous intensity of a projection environment of the color image; and an adjusting unit configured to adjust a time period of the fifth duration. ### Claim 8 (depends on 7) The projector apparatus according to claim 7, wherein the second acquiring unit is configured to acquire a luminous intensity before and after projection of a color image and to detect the luminous intensity of the projection environment of the color image based on a difference between the luminous intensities acquired before and after projection. ### Claim 9 (depends on 6) The projector apparatus according to claim 6, wherein the fifth duration is between fourth durations in which one of the light emitting elements emits light. ### Claim 10 (depends on 9) The projector apparatus according to claim 9, wherein the fifth duration is shorter than the fourth durations. ### Claim 11 (depends on 6) The projector apparatus according to claim 6, wherein time periods of the first duration, the second duration, the third duration, and the fifth duration are the same. ### Claim 12 (depends on 3) The projector apparatus according to claim 3, wherein the second light emission pattern information comprises a fifth duration in which the light emitting elements of red, green, and blue simultaneously emit light. ### Claim 13 (depends on 12) The projector apparatus according to claim 12, further comprising: a second acquiring unit configured to acquire a luminous intensity of a projection environment of the color image; and an adjusting unit configured to adjust a time period of the fifth duration. ### Claim 14 (depends on 13) The projector apparatus according to claim 13, wherein the second acquiring unit is configured to acquire a luminous intensity before and after projection of a color image, and to detect the luminous intensity of the projection environment of the color image based on a difference between the luminous intensities acquired before and after projection. ### Claim 15 (depends on 12) The projector apparatus according to claim 12, wherein the fifth duration is between fourth durations in which one of the light emitting elements emits light. ### Claim 16 (depends on 15) The projector apparatus according to claim 15, wherein the fifth duration is shorter than the fourth durations. ### Claim 17 (depends on 12) The projector apparatus according to claim 12, wherein time periods of the first duration and the fifth duration are the same. ### Claim 18 A control method for a projector apparatus that includes light emitting elements of red, blue, and green, and projects a color image in a field sequential color system, the projector apparatus comprising a memory configured to store complementary color light emission pattern information and usual color light emission pattern information for a period of light emission by the light emitting elements, the complementary color light emission pattern information including one of a first duration in which only light emitting elements of red and green simultaneously emit light, a second duration in which only light emitting elements of green and blue simultaneously emit light, and a third duration in which only light emitting elements of red and blue simultaneously emit light, and the usual color light emission pattern information including a duration other than the first duration, the second duration, and the third duration, the control method comprising: acquiring information indicative of whether color components of the color image include a complementary color component; reading the complementary color light emission pattern information corresponding to the complementary color component included in the color components of the color image from the memory when information is acquired indicating that the color components of the color image include a complementary color component, and reading the usual color light emission pattern information when information is acquired indicating that the color components of the color image do not include a complementary color component; and controlling a light emission pattern for a period of light emission by the light emitting elements based on the read color light emission pattern information. ### Claim 19 A non-transitory computer-readable medium having stored thereon a program that is executable by a computer for a projector apparatus that includes light emitting elements of red, blue, and green, and that projects a color image in a field sequential color system, the projector apparatus comprising a memory configured to store complementary color light emission pattern information and usual color light emission pattern information for a period of light emission by the light emitting elements, the complementary color light emission pattern information including one of a first duration in which only light emitting elements of red and green simultaneously emit light, a second duration in which only light emitting elements of green and blue simultaneously emit light, and a third duration in which only light emitting elements of red and blue simultaneously emit light, and the usual color light emission pattern information including a duration other than the first duration, the second duration, and the third duration, the program being executable by the computer to perform functions comprising: acquiring information indicative of whether color components of the color image include a complementary color component; reading the complementary color light emission pattern information corresponding to the complementary color component included in the color components of the color image from the memory when information is acquired indicating that the color components of the color image include a complementary color component, and reading the usual color light emission pattern information when information is acquired indicating that the color components of the color image do not include a complementary color component; and controlling a light emission pattern for a period of light emission by the light emitting elements based on the read complementary color light emission pattern information. ### Claim 20 (depends on 1) The projector apparatus according to claim 1, wherein the memory is configured to store a plurality of complementary color light emission pattern information, and the reading unit is configured to read one of the plurality of complementary color light emission pattern information based on the complementary color included in the color components of the color image. ### Claim 21 (depends on 20) The projector apparatus according to claim 20, wherein the plurality of complementary color light emission pattern information comprise a different number of durations for emitting a complementary color.