Light emitting device and display apparatus and read apparatus using the light emitting device
First Claim
Patent Images
1. A light emitting device comprising:
- multiple types of light sources emitting light of different colors;
light detection means for monitoring emission intensity of at least one light source among the multiple types of light sources; and
light emission control means which performs control to provide a light emitting period in which all of the multiple types of light sources emit light at a same time at predetermined emission intensities and a monitoring period in which an emission intensity of only a single light source is decreased,wherein the light emission control means controls the emission intensity of the at least one light source among the multiple types of light sources using emission intensity information from the light detection means in the monitoring period to adjust composite light from the multiple types of light sources to have a desired luminance or chromaticity.
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Abstract
A light emitting device provided with a plurality of types of light sources having different light emitting colors and with a light emission control means for allowing light to emit, during a specified period of monitoring a light emitting intensity, from at least one light source out of the plurality of types of light sources at a light emitting intensity different from that available outside the specified period. Accordingly, when a plurality of types of light sources are used, the light emitting intensities of a plurality of types of light sources can be monitored with light sensors of types fewer than the types of light sources to control while points and a brightness characteristics.
42 Citations
13 Claims
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1. A light emitting device comprising:
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multiple types of light sources emitting light of different colors; light detection means for monitoring emission intensity of at least one light source among the multiple types of light sources; and light emission control means which performs control to provide a light emitting period in which all of the multiple types of light sources emit light at a same time at predetermined emission intensities and a monitoring period in which an emission intensity of only a single light source is decreased, wherein the light emission control means controls the emission intensity of the at least one light source among the multiple types of light sources using emission intensity information from the light detection means in the monitoring period to adjust composite light from the multiple types of light sources to have a desired luminance or chromaticity. - View Dependent Claims (2, 3, 4, 7, 8, 9)
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5. A light emitting device comprising:
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multiple types of light sources emitting light of different colors; light detection means for monitoring emission intensity of at least one light source among the multiple types of light sources; and light emission control means which performs control to provide a light emitting period in which all of the multiple types of light sources emit light at a same time at predetermined emission intensities and a monitoring period in which emission intensities of at least one of but fewer than the number of the multiple types of light sources are increased to a value greater than zero and greater than the light-emitting intensity of each of the light sources during a period during which all of the types of light sources are made to emit light at the same time, wherein the light emission control means controls the emission intensity of the at least one light source among the multiple types of light sources using emission intensity information from the light detection means in the monitoring period to adjust composite light from the multiple types of light sources to have a desired luminance or chromaticity. - View Dependent Claims (6, 10, 11)
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12. A light emitting device, comprising:
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multiple types of light sources emitting light of different colors; light detection means for monitoring emission intensity of at least one light source among the multiple types of light sources; and light emission control means which performs control to provide a light emitting period in which all of the multiple types of light sources emit light at a same time at predetermined emission intensities and a monitoring period in which at least one of but fewer than the number of the multiple types of light sources emits light at emission intensity different from that in the light emitting period in which all of the multiple types of light sources emit light at the same time, wherein the light emission control means provides a period in which all of the multiple types of light sources are turned off, the light detection means monitors amount of light in a state that all of the multiple types of light sources are turned off, the light emission control means corrects emission intensity information from the light detection means in the monitoring period based on the state that all of the multiple types of light sources are turned off.
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13. A light emitting device, comprising:
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multiple types of light sources emitting light of different colors; light detection means for monitoring emission intensity of at least one light source among the multiple types of light sources; and light emission control means which performs control to provide a light emitting period in which all of the multiple types of light sources emit light at a same time at predetermined emission intensities and a monitoring period in which emission intensities of at least one of but fewer than the number of the multiple types of light sources are decreased to a value greater than zero and less than the light-emitting intensity of each of the light sources during a period during which all of the types of light sources are made to emit light at the same time, wherein the light emission control means controls the emission intensity of the at least one light source among the multiple types of light sources using emission intensity information from the light detection means in the monitoring period to adjust composite light from the multiple types of light sources to have a desired luminance or chromaticity.
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Specification