Light-emitting apparatus and display apparatus

Patent metadata

Field	Value
Publication number	US-10219352-B2
Application number	US-201715664181-A
Country	US
Kind code	B2
Filing date	Jul 31, 2017
Priority date	Aug 4, 2016
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A light-emitting apparatus includes: a light source unit; an optical sensor configured to acquire a light detection value corresponding to light emitted from the light source unit; a temperature sensor configured to acquire a temperature detection value corresponding to temperature of the optical sensor; and a correction unit configured to execute switching between first processing to acquire a current corrected detection value by correcting a current light detection value, based on a current temperature detection value, and second processing to acquire a current corrected detection value, based on: 1) at least one of a past light detection value and a past corrected detection value; 2) a past temperature detection value; and 3) the current temperature detection value.

First claim

What is claimed is:

1. A light-emitting apparatus, comprising:
a light source unit;
a control unit configured to control the light source unit emitting a light by controlling lighting period of the light source unit:
an optical sensor configured to acquire a light detection value corresponding to at least one of a brightness and a color of light emitted from the light source unit;
a temperature sensor disposed near the optical sensor; and
a correction unit configured to execute
a first processing to acquire a current corrected detection value by correcting a current light detection value, based on a current temperature detection value from the temperature sensor if that the lighting period of the light source unit is equal to or more than a threshold, and
a second processing to acquire a current corrected detection value, based on: 1) a past corrected detection value; 2) a past temperature detection value from the temperature sensor; and 3) the current temperature detection value from the temperature sensor if that the lighting period of the light source unit is less than the threshold.

2. The light-emitting apparatus according to claim 1 , wherein
in the second processing, the correction unit does not use the current light detection value for acquiring the current corrected detection value.

3. The light-emitting apparatus according to claim 1 , wherein the correction unit records: at least one of the light detection value and the corrected detection value; and the temperature detection value, in a storage unit.

4. The light-emitting apparatus according to claim 3 , wherein if where the correction unit executes the first processing, the correction unit records: at least one of the light detection value and the corrected detection value; and the temperature detection value, in the storage unit.

5. The light-emitting apparatus according to claim 1 , wherein
the past light detection value, the past corrected detection value, and the past temperature detection value are previous detection values.

6. The light-emitting apparatus according to claim 1 wherein
in the second processing, the current corrected detection value is acquired based on the past temperature detection value, the current to temperature detection value, and the past light detection value.

7. light-emitting apparatus according to claim 6 , wherein
a plurality of correspondence relations, which correspond to a plurality of ranges of the temperature detection value respectively, are predetermined as a correspondence relation between the temperature detection value and a correction value to correct the light detection value, and
in the second processing,
a correction value corresponding to the current temperature detection value is determined in accordance with an approximate relation approximating a correspondence relation corresponding to the past temperature detection value and a correspondence relation corresponding to the current temperature detection value, and
the current corrected detection value is acquired by correcting the past light detection value by using the determined correction value.

8. The light--emitting apparatus according to claim 7 , wherein
in the first processing,
a correction value corresponding to the current temperature detection value is determined in accordance with the correspondence relation corresponding to the current temperature detection value, and
the current corrected detection value is acquired by correcting the n light detection value by using the determined correction value.

9. The light-emitting apparatus according to claim 6 , wherein
in the second processing, the past light detection value is inversely calculated based on the past temperature detection value and the past corrected detection value.

10. The light-emitting apparatus according to claim 1 , wherein
a timing to execute the first processing and a timing to execute the second processing are predetermined.

11. The light-emitting apparatus according to claim 10 , further comprising:
a control unit configured to control light emission of the light source unit; and
a determination unit configured to determine whether or not the light emitted from the light source unit is detectable, based on a light emission state of the light source unit, wherein
the correction unit
executes the first processing at the timing to executing the first processing if where the determination unit determines that the light emitted from the light source unit is detectable,
executes the second processing at the timing to execute the first processing if where the determination unit determines that the light emitted from the light source is not detectable, and executes the second processing at the timing to execute the second processing regardless of the determination result of the determination unit.

12. The light-emitting apparatus according to claim 1 , further comprising,
a control unit configured to control light emission of the light source unit; and
a determination unit configured to determine whether or not the light emitted from the light source unit is detectable, based on a light emission state of the light source unit, wherein
the correction unit executes
the first processing if where the determination unit determines that the light emitted from the light source unit is detectable, and executes the second processing if where the determination unit determines that the light emitted from the light source unit is not detectable.

13. The light-emitting apparatus according to claim 11 , wherein the determination unit determines that the light emitted from the light source unit is detectable if where one lighting period of the light source unit is not less than the threshold, and determines that the light emitted from the light source unit is not detectable if where the one lighting period of the light source unit is less than the threshold.

14. The light-emitting apparatus according to claim 1 , comprising a plurality of light source units, wherein
the processing by the optical sensor, the processing by the temperature sensor, and the processing by the correction unit are executed for each of the plurality of light source units.

15. A display apparatus, comprising:
the light-emitting apparatus according to claim 1 ; and
a display unit configured to display an image by modulating light emitted from the light-emitting apparatus.

16. A method for controlling a light-emitting apparatus having:
a light source unit;
a control unit configured to control the light source unit emitting a light by controlling lighting period of the light source unit;
an optical sensor configured to acquire a light detection value corresponding to at least one of a brightness and a color of light emitted from the light source unit; and
a temperature sensor disposed near the optical sensor,
the method comprising:
a correction step of executing
a first processing to acquire a current corrected detection value by correcting a current light detection value, based on a current temperature detection value from the temperature sensor if that a lighting period of the light source unit is equal to or more than a threshold, and
a second processing to acquire a current corrected detection value, based on: 1) a past corrected detection value from the temperature sensor; 2) a past temperature detection value; and 3) the current temperature detection value from the temperature sensor if that the lighting period of the light source unit is less than the threshold.

17. A non-transitory computer readable medium that stores

Assignees

• Canon Kk

Inventors

• Uchiike Hiroshi
• Matsuura Yasuhiro
• Tada Mitsuru

Classifications

• H05B45/22

  using optical feedback · CPC title

• G01J1/0228

  Control of working procedures; Failure detection; Spectral bandwidth calculation · CPC title

• G09G2360/14

  Detecting light within display terminals, e.g. using a single or a plurality of photosensors · CPC title

• H05B47/105 Primary

  in response to determined parameters · CPC title

• G09G2320/041

  Temperature compensation · CPC title