Display apparatus with lighting device, control method for display apparatus, and storage medium

• US 10,192,495 B2
• Filed: 10/13/2016
• Issued: 01/29/2019
• Est. Priority Date: 10/15/2015
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ikeda, Takeshi, Kimura, Takushi, Sugimoto, Kousei
• Primary Examiner(s): Sajous, Wesner
• Application Number:
  US15/293,041
• Publication Number:
  US 20170110070A1
• Time in Patent Office: 838 Days
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0238 Improving the black level
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/066 for control of contrast
• CPC Class Codes: G09G 2320/0686 with two or more screen areas displaying information with different brightness or colours
• CPC Class Codes: G09G 2340/00 Aspects of display data processing
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: G09G 3/36 using liquid crystals

Abstract

A display apparatus includes light-emitting units, a liquid crystal panel, a representative luminance acquisition unit for acquiring luminance values of the light-emitting units, an HPF processing unit for acquiring HPF luminance values of the light-emitting units by increasing the luminance value of a target light-emitting unit, which is greater than that of a neighboring light-emitting unit, according to a difference of the luminance value of the target light-emitting unit and that of the neighboring light-emitting unit, a smoothing processing unit for acquiring correction luminance values of the light-emitting units by increasing the HPF luminance value of a target light-emitting unit, which is smaller than that of a neighboring light-emitting unit, according to a difference of the HPF luminance value of the target light-emitting unit and that of the neighboring light-emitting unit, and a light-emission control unit for controlling light emission of the light-emitting units using the correction luminance values.

Claims

1. A display apparatus comprising:

a plurality of light-emitting units configured to emit light;

a display unit configured to display an image on a screen with transmitted light emitted based on an input image;

a first acquisition unit configured to acquire initial luminance values of the plurality of light-emitting units based on the luminance of each of a plurality of regions of the input image corresponding to each of the plurality of light-emitting units;

a first processing unit configured to acquire intermediate luminance values of the plurality of light-emitting units by correcting the initial luminance values, wherein the first processing unit increases an initial luminance value of a first target light-emitting unit among the plurality of light-emitting units that is greater than an initial luminance value of a first neighboring light-emitting unit neighboring the first target light-emitting unit, according to a difference of the initial luminance value of the first target light-emitting unit and the initial luminance value of the first neighboring light-emitting unit;

a second processing unit configured to acquire correct luminance values of the plurality of light-emitting units by correcting the intermediate luminance values, wherein the second processing unit increases an intermediate luminance value of a second target light-emitting unit among the plurality of light-emitting units that is smaller than an intermediate luminance value of a second neighboring light-emitting unit neighboring the second target light-emitting unit, according to a difference of the intermediate luminance value of the second target light-emitting unit and the intermediate luminance value of the second neighboring light-emitting unit, the second target light-emitting unit being same or different from the first target light-emitting unit; and

a control unit configured to control light emission of each of the plurality of light-emitting units according to the correct luminance value of each of the plurality of light-emitting units.

2. The display apparatus according to claim 1, wherein the first processing unit acquires the intermediate luminance values of the plurality of light-emitting units by performing filter calculation on a distribution of the initial luminance values of the plurality of light-emitting units in such a way as to emphasize high-frequency components of the distribution.

3. The display apparatus according to claim 1, wherein the first processing unit acquires the intermediate luminance value of the first target light-emitting unit by adding a value obtained by multiplying a predetermined coefficient with the initial luminance value of the first neighboring light-emitting unit to the initial luminance value of the first target light-emitting unit.

4. The display apparatus according to claim 1, wherein the second processing unit acquires the correct luminance value of the second target light-emitting unit by increasing the intermediate luminance value of the second target light-emitting unit according to the difference between the intermediate luminance value of the second target light-emitting unit and the highest luminance value among a plurality of the intermediate luminance values of a plurality of the second target light-emitting units.

5. The display apparatus according to claim 1, further comprising:

a second acquisition unit configured to acquire a requisite luminance to display the input image;

an estimation unit configured to acquire an estimation luminance of the display unit in a case where the plurality of light-emitting units are turned on at the correct luminance values of the plurality of light-emitting units; and

a first correction unit configured to perform a correction including comparing the estimation luminance and the requisite luminance and increasing the correct luminance value of the light-emitting unit corresponding to a region where the estimation luminance is smaller than the requisite luminance.

6. The display apparatus according to claim 1, wherein the first acquisition unit acquires the initial luminance value of each of the plurality of light-emitting units based on at least one of maximum gradation value, average gradation value, maximum luminance, and average luminance of each of the plurality of regions of the input image.

7. The display apparatus according to claim 1, further comprising:

a second acquisition unit configured to acquire a requisite luminance to display the input image;

an estimation unit configured to acquire an estimation luminance of the display unit in a case where the plurality of light-emitting units are turned on at the correct luminance values of the plurality of light-emitting units;

a third acquisition unit configured to acquire unevenness in the correct luminance values of the plurality of light-emitting units; and

a correction unit configured to relatively increase the correct luminance values in a case where the unevenness is larger than a predetermined value.

8. The display apparatus according to claim 7, wherein the third acquisition unit acquires the unevenness in the correct luminance values based on at least one of a characteristic value indicating the luminance of the plurality of regions, the requisite luminance, the estimation luminance, and the correct luminance value.

9. The display apparatus according to claim 8, wherein the correction unit relatively increases the correct luminance value, in a case where a difference between a maximum value and an average value or a difference between a minimum value and the average value of at least one of the characteristic value, the requisite luminance, the estimation luminance, and the correct luminance value of the plurality of light-emitting units is greater than a first threshold value.

10. The display apparatus according to claim 8, wherein the correction unit relatively increases the correct luminance value, in a case where a dispersion value of at least one of the characteristic value, the requisite luminance, the estimation luminance, and the correct luminance value of the plurality of light-emitting units is greater than a second threshold value.

11. The display apparatus according to claim 8, wherein, in the case where a sum value of at least one of the characteristic value, the requisite luminance, the estimation luminance, and the correct luminance value of the plurality of light-emitting units is smaller than a third threshold value, the correction unit relatively increases the correct luminance value compared to a case where the sum value of the plurality of light-emitting units is not smaller than the third threshold value.

12. The display apparatus according to claim 7, wherein the correction unit relatively increases the correct emission luminance value corresponding to an external light source among the plurality of light-emitting units.

13. The display apparatus according to claim 1, further comprising:

an average acquisition unit configured to acquire an average picture level (APL) of the input image; and

a correction unit configured to correct the correct luminance value, wherein

in a case where the APL is lower than a predetermined threshold value, the correction unit increases the correct luminance value compared to a case where the APL is equal to or higher than the predetermined threshold.

14. The display apparatus according to claim 1, wherein the display unit includes a liquid crystal panel.

15. A display apparatus, comprising:

a plurality of light-emitting units respectively configured to emit light;

a display unit configured to display an image on a screen with transmitted light emitted based on an input image;

a first acquisition unit configured to acquire initial characteristic values indicating the luminance of a plurality of regions of the input image corresponding to the plurality of light-emitting units;

a first processing unit configured to acquire intermediate characteristic values of the plurality of regions by correcting the initial characteristic values of the plurality of regions, wherein the first processing unit increases an initial characteristic value of a first target region among the plurality of regions that is greater than an initial characteristic value of a first neighboring region neighboring the first target region, according to a difference of the initial characteristic value of the first target region and the initial characteristic value of the first neighboring region;

a second processing unit configured to acquire correct characteristic values of the plurality of regions by correcting the intermediate characteristic values of the plurality of regions, wherein the second processing unit increases an intermediate characteristic value of a second target region among the plurality of regions that is smaller than an intermediate characteristic value of a second neighboring region neighboring the second target region, according to a difference of the intermediate characteristic value of the second target region and the intermediate characteristic value of the second neighboring region, the second target region being same or different from the first target region; and

a control unit configured to control light emission of each of the plurality of light-emitting units based on correct characteristic value of each of the plurality of regions.

16. A display apparatus comprising:

a plurality of light-emitting units respectively configured to emit light;

a display unit configured to display an image on a screen with transmitted light emitted based on an input image;

a first acquisition unit configured to acquire initial luminance values of each of the plurality of light-emitting units based on the luminance of each of a plurality of regions of the input image corresponding to each of the plurality of light-emitting units; and

a control unit configured to control light emission of the plurality of light-emitting units based on correct luminance values of the plurality of light-emitting units, obtained by increasing the initial luminance value of a target light-emitting unit among the plurality of light-emitting units according to the difference between the initial luminance value of the target light-emitting unit and the initial luminance value of a neighboring light-emitting unit neighboring the target light-emitting unit.

17. The display apparatus according to claim 16,

wherein, in a case of the initial luminance value of the target light-emitting unit is greater than the initial luminance value of the neighboring light-emitting unit, the control unit acquires the correct luminance value of the target light-emitting unit by increasing the initial luminance value of the target light-emitting unit according to the difference between the initial luminance value of the target light-emitting unit and the initial luminance value of the neighboring light-emitting unit, and

wherein, in a case where the initial luminance value of the target light-emitting unit is smaller than the initial luminance value of the neighboring light-emitting unit, the control unit acquires the correct luminance value of the target light-emitting unit by increasing the initial luminance value of the target light-emitting unit according to the difference between the initial luminance value of the target light-emitting unit and the initial luminance value of the neighboring light-emitting unit.

18. A display apparatus, comprising:

a plurality of light-emitting units respectively configured to emit light;

a display unit configured to display an image on a screen with transmitted light emitted based on an input image;

a first acquisition unit configured to acquire initial characteristic values indicating the luminance of a plurality of regions of the input image corresponding to the plurality of light-emitting units; and

a control unit configured to control light emission of the plurality of light-emitting units at emission luminance of the plurality of light-emitting units based on correct characteristic values of the plurality of regions obtained by increasing the initial characteristic value of a target region among the plurality of regions according to the difference between the initial characteristic value of the target region and the initial characteristic value of a neighboring region neighboring the target region.

19. A method for controlling a display apparatus that includes a plurality of light-emitting units configured to emit light, and a display unit configured to display an image on a screen with transmitted light emitted based on an input image, the method comprising:

first acquiring step configured to acquire initial luminance values of the plurality of light-emitting units based on the luminance of each of a plurality of regions of an input image corresponding to each of a plurality of light-emitting units;

second acquiring step configured to acquire intermediate luminance values of the plurality of light-emitting units by correcting the initial luminance values of the plurality of light-emitting units, wherein the first processing unit increases an initial luminance value of a first target light-emitting unit among the plurality of light-emitting units that is greater than an initial luminance value of a first neighboring light-emitting unit neighboring the first target light-emitting unit, according to a difference of the initial luminance value of the first target light-emitting unit and the initial luminance value of the first neighboring light-emitting unit;

third acquiring step configured to acquire correct luminance values of the plurality of light-emitting units by correcting the intermediate luminance values of the plurality of light-emitting units, wherein the second processing unit increases an intermediate luminance value of a second target light-emitting unit among the plurality of light-emitting units that is smaller than an intermediate luminance value of a second neighboring light-emitting unit neighboring the second target light-emitting unit, according to a difference of the intermediate luminance value of the second target light-emitting unit and the intermediate luminance value of the second neighboring light-emitting unit; and

controlling step configured to control light emission of each of the plurality of light-emitting units according to the correct luminance value of each of the plurality of light-emitting units.

20. The method for controlling the display apparatus according to claim 19, wherein the second acquiring step includes acquiring the intermediate luminance values of the plurality of light-emitting units by performing filter calculation on a distribution of the initial luminance values of the plurality of light-emitting units in such a way as to emphasize high-frequency components of the distribution.

21. The method for controlling the display apparatus according to claim 19, wherein the second acquiring step includes acquiring the intermediate luminance value of the first target light-emitting unit by adding a value obtained by multiplying a predetermined coefficient with the initial luminance value of the first target light-emitting unit to the initial luminance value of the first neighboring light-emitting unit.

22. The method for controlling the display apparatus according to claim 19, wherein the second acquiring step includes not performing processing for estimating an irradiation luminance of the display unit when each light-emitting unit is turned on at the initial luminance value.

23. The method for controlling the display apparatus according to claim 19, wherein the third acquiring step includes acquiring the correct luminance value of the second target light-emitting unit by increasing the intermediate luminance value of the second target light-emitting unit according to the difference between the intermediate luminance value of the second target light-emitting unit and the highest luminance value among a plurality of the intermediate luminance values of a plurality of the second target light-emitting units.

28. A computer readable storage medium storing a program that causes a computer to perform each processing of the method for controlling the display apparatus according to claim 19.

24. A method for controlling a display apparatus that includes a plurality of light-emitting units configured to emit light and a display unit configured to display an image on a screen with transmitted light emitted based on an input image, the method comprising:

first acquiring step configured to acquire initial characteristic values indicating the luminance of a plurality of regions of the input image corresponding to the plurality of light-emitting units;

second acquiring step configured to acquire intermediate characteristic values of the plurality of regions by correcting the initial characteristic values of the plurality of regions;

third acquiring step configured to acquire correct characteristic values of the plurality of regions by correcting the intermediate characteristic values of the plurality of regions; and

controlling step configured to control light emission of each of the plurality of light-emitting unit based on the correct characteristic values of each of the plurality of regions.

25. A method for controlling a display apparatus that includes a plurality of light-emitting units configured to emit light and a display unit configured to display an image on a screen with transmitted light emitted based on an input image, the method comprising:

acquiring step configured to acquire initial luminance values of each of the plurality of light-emitting units based on the luminance of each of a plurality of regions of the input image corresponding to each of the plurality of light-emitting units; and

controlling step configured to control light emission of the plurality of light-emitting units based on correct luminance values of the plurality of light-emitting units, obtained by increasing the initial luminance value of a target light-emitting unit among the plurality of light-emitting units according to the difference between the initial luminance value of the target light-emitting unit and the initial luminance value of a neighboring light-emitting unit neighboring the target light-emitting unit.

26. The method for controlling the display apparatus according to claim 25, wherein the controlling step includes

acquiring the correct luminance value of the target light-emitting unit by increasing the initial luminance value of the target light-emitting unit according to the difference between the initial luminance value of the target light-emitting unit and the initial luminance value of the neighboring light-emitting unit in a case of the initial luminance value of the target light-emitting unit is greater than the initial luminance value of the neighboring light-emitting unit, and

acquiring the correct luminance value of the target light-emitting unit by increasing the initial luminance value of the target light-emitting unit according to the difference between the initial luminance value of the target light-emitting unit and the initial luminance value of the neighboring light-emitting unit in a case where the initial luminance value of the target light-emitting unit is smaller than the initial luminance value of the neighboring light-emitting unit.

27. A method for controlling a display apparatus that includes a plurality of light-emitting units respectively configured to emit light and a display unit configured to display an image on a screen with transmitted light emitted based on an input image, the method comprising:

acquiring step configured to acquire initial characteristic values indicating the brightness of a plurality of regions of the input image corresponding to the plurality of light-emitting units; and

controlling step configured to control light emission of the plurality of light-emitting units at emission luminance of the plurality of light-emitting units based on correct characteristic values of the plurality of regions obtained by increasing the initial characteristic value of a target region among the plurality of regions according to the difference between the initial characteristic value of the target region and the initial characteristic value of a neighboring region neighboring the target region.