Display apparatus, control method of display apparatus, and non-transitory computer readable medium having temperature correction

Patent metadata

Field	Value
Publication number	US-11158288-B2
Application number	US-202016939413-A
Country	US
Kind code	B2
Filing date	Jul 27, 2020
Priority date	Jul 29, 2019
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

The invention is a display device and method for correcting the amount of emitted light and brightness level from multiple light sources, which illuminate an object that is being imaged and displayed by a display module. The device and system include multiple temperature sensors that correspond to each of the multiple positions in the display module. The device and system also include a computer processor, which operates as a correction unit to individually correct the brightness for each of the multiple light sources based on the detected temperatures, detected by the temperature sensors, respectively, and the dispersion of the plurality of temperatures. The correction unit also performs (1) the temperature correction processing, to individually correct each of the multiple measured temperatures based on the dispersion; and (2) the brightness correction processing, to individually correct each of the brightness levels of the multiple light sources based on the corrected temperatures.

First claim

What is claimed is:

1. A display apparatus comprising:
a display module configured to display an image by causing a plurality of light sources to emit light;
a plurality of temperature sensors corresponding to a plurality of positions in the display module respectively; and
at least one memory and at least one processor which function as: a correction unit configured to individually correct each of brightnesses of the plurality of light sources based on a plurality of temperatures detected by the plurality of temperature sensors respectively and dispersion of the plurality of temperatures, wherein
the correction unit includes:
a temperature correction unit configured to individually correct each of the plurality of temperatures based on the dispersion; and
a brightness correction unit configured to individually correct each of the brightnesses of the plurality of light sources based on the plurality of corrected temperatures.

2. The display apparatus according to claim 1 , wherein
the display module includes: a backlight including the plurality of light sources; and a display panel configured to display the image by transmitting the light emitted from the plurality of light sources.

3. The display apparatus according to claim 2 , wherein
each of the plurality of light sources is an LED.

4. The display apparatus according to claim 1 , wherein
the plurality of temperature sensors correspond to the plurality of light sources respectively.

5. The display apparatus according to claim 1 , wherein
the temperature correction unit corrects each of the plurality of temperatures using a larger coefficient as the dispersion is larger in a portion of the display module corresponding to this temperature.

6. The display apparatus according to claim 1 , further comprising:
a first sensor configured to detect a temperature around the display apparatus, wherein
the correction unit individually corrects each of the brightnesses of the plurality of light sources based on the plurality of temperatures, the dispersion and the temperature detected by the first sensor.

7. The display apparatus according to claim 1 , wherein
the correction unit uses a difference between each of the plurality of temperatures and an average of the plurality of temperatures, as the dispersion.

8. The display apparatus according to claim 1 , wherein, the correction unit uses a difference between each of the plurality of temperatures and an average of a part of the plurality of temperatures, at the dispersion, and
for each of the plurality of temperatures, an average of the temperatures detected by the temperature sensor which detected this temperature and the peripheral temperature sensor thereof is used as the average of the part of the plurality of temperatures.

9. The display apparatus according to claim 1 , further comprising:
a heat dissipation member configured to dissipate heat of the display module; and
a second sensor configured to detect a temperature of the heat dissipation member, wherein
the correction unit uses a difference between each of the plurality of temperatures and the temperature detected by the second sensor, as the dispersion.

10. The display apparatus according to claim 1 , further comprising:
a fan configured to cool the display module, wherein
the at least one memory and at least one processor further function as: a control unit configured to control a rotation speed of the fan by controlling voltage to be applied to the fan, and
the correction unit uses a difference between each of the plurality of temperatures and a temperature in accordance with the voltage to be applied to the fan or the rotation speed of the fan, as the dispersion.

11. The display apparatus according to claim 1 , wherein
the correction unit switches, based on the dispersion, a correction parameter which is used for individually correcting each of the brightnesses of the plurality of light sources based on the plurality of temperatures.

12. The display apparatus according to claim 11 , wherein
the display module includes: a backlight including the plurality of light sources; and a display panel configured to display the image by transmitting the light emitted from the plurality of light sources, and
the correction unit switches the correction parameter depending on whether a local dimming mode is on or off.

13. A control method of a display apparatus including: a display module configured to display an image by causing a plurality of light sources to emit light; and a plurality of temperature sensors corresponding to a plurality of positions in the display module respectively,
the control method comprising:
acquiring a plurality of temperatures detected by the plurality of temperature sensors respectively;
individually correcting each of the plurality of temperatures based on dispersion of the plurality of temperatures; and
individually correcting each of brightnesses of the plurality of light sources based on the plurality of corrected temperatures.

14. A non-transitory computer readable medium that stores a program, wherein the program causes a computer to execute a control method of a display apparatus including: a display module configured to display an image by causing a plurality of light sources to emit light; and a plurality of temperature sensors corresponding to a plurality of positions in the display module respectively,
the control method comprising:
acquiring a plurality of temperatures detected by the plurality of temperature sensors respectively;
individually correcting each of the plurality of temperatures based on dispersion of the plurality of temperatures; and
individually correcting each of brightnesses of the plurality of light sources based on the plurality of corrected temperatures.

Assignees

• Canon Kk

Inventors

• Tada Mitsuru

Classifications

• G09G3/3426 Primary

  the different display panel areas being distributed in two dimensions, e.g. matrix · CPC title

• G09G2320/041

  Temperature compensation · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G5/10 Primary

  Intensity circuits · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title