Display apparatus and display method

• US 8,803,923 B2
• Filed: 03/14/2011
• Issued: 08/12/2014
• Est. Priority Date: 03/16/2010
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Shimizu, Masayoshi
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): Edwards, Carolyn R
• Application Number:
  US13/047,397
• Publication Number:
  US 20110227962A1
• Time in Patent Office: 1,247 Days
• US Class Current: 345/690
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/0653 Controlling or limiting the speed of brightness adjustment of the illumination source
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

A display apparatus includes: an acceptance unit that accepts a first input image and a second input image; a light control unit that outputs a display image; a plurality of light sources that irradiate the light control unit; a light emitting amount computation unit that computes a first light emitting amount based on a luminance of the first input image and computes a tentative light emitting amount based on a luminance of the second input image, on a basis of a comparison result between the first light emitting amount and the tentative light emitting amount, imposes a limit on a change range from the first light emitting amount to a second light emitting amount, and decide the second light emitting amount; and a light source control unit that controls each of the plurality of light sources based on the second light emitting amount.

Claims

1. A display apparatus comprising:

a plurality of light sources;

a display panel configured to output a display image based on an input image, with using irradiation by the plurality of light sources; and

a processor coupled to a memory, configured to;

accept a first input image and a second input image,

compute a first light emitting amount of each of the plurality of light sources based on a luminance of the first input image,

compute a tentative light emitting amount based on a luminance of the second input image of each of the plurality of light sources,

on a basis of a comparison result between the first light emitting amount and the tentative light emitting amount, impose a limit on a change range from the first light emitting amount to a second light emitting amount of each of the plurality of light sources, and

decide the second light emitting amount in a case where the display image is outputted based on the second input image in accordance with the limit;

control each of the plurality of light sources on the basis of the second light emitting amount;

wherein the processor is configured to accept a third input image prior to the first input image and the second input image, and wherein processor is configured to compute a third light emitting amount of each of the plurality of light sources based on the third input image and decides the second light emitting amount based on the first light emitting amount, the tentative light emitting amount, and the third light emitting amount; and

wherein the processor is configured to set a value of the second light emitting amount within a range from a value of the first light emitting amount based on the limit in a case where a light emission change from the third light emitting amount to the first light emitting amount and another light emission change from the first light emitting amount to the tentative light emitting amount are different from each other;

wherein the processor determines whether a direction of the change from the first light emitting amount to the tentative light emitting amount is on a plus side or a minus side for each light source of said plurality of light sources and imposes a limit of prohibiting light emission at the tentative light emitting amount in each of the light sources of said plurality of light sources whose change is sorted into a minority side among the plus side and the minus side.

2. The display apparatus according to claim 1,

wherein the processor is configured to impose a second limit on a light emission change from the first light emitting amount.

3. The display apparatus according to claim 2,

wherein the processor is configured to determine whether the light emission change from the first light emitting amount to the tentative light emitting amount is a first direction or a second direction with regard to each of the plurality of light sources and imposes the second limit of prohibiting light emission at the tentative light emitting amount on the light source in which the tentative light emitting amount having either light emission change of the first direction or the second direction is set among the plurality of light sources.

4. The display apparatus according to claim 3,

wherein the processor is configured to identify the light emission change into which fewer light sources are sorted among the first direction and the second direction as a result of sorting the light emission change of each of the plurality of light sources and decides the second light emitting amount of the light source sorted into the identified light emission change as the first light emitting amount.

5. The display apparatus according to claim 1,

wherein the processor is configured to set the value of the second light emitting amount as the value of the first light emitting amount based on the limit in a case where the light emission change from the third light emitting amount to the first light emitting amount and the another light emission change from the first light emitting amount to the tentative light emitting amount are different from each other.

6. A display apparatus comprising:

a plurality of light sources;

a display panel configured to output a display image based on an input image, with using irradiation by the plurality of light sources; and

a processor coupled to a memory, configured to;

accept a first input image and a second input image,

detect a change in luminance from the first input image to the second input image based on the first input image and the second input image,

compute a first light emitting amount of each of the plurality of light sources based on a luminance of the first input image and decide a second light emitting amount of each of the plurality of light sources based on the change in luminance and the first light emitting amount in a case where the second input image is displayed,

control each of the plurality of light sources based on the second light emitting amount;

wherein the processor is configured to accept a third input image prior to the first input image and the second input image, and wherein processor is configured to compute a third light emitting amount of each of the plurality of light sources based on the third input image and decides the second light emitting amount based on the first light emitting amount, the tentative light emitting amount, and the third light emitting amount; and

wherein the processor is configured to set a value of the second light emitting amount within a range from a value of the first light emitting amount based on the limit in a case where a light emission change from the third light emitting amount to the first light emitting amount and another light emission change from the first light emitting amount to the tentative light emitting amount are different from each other;

wherein the processor determines whether a direction of the change from the first light emitting amount to the tentative light emitting amount is on a plus side or a minus side for each light source of said plurality of light sources and imposes a limit of prohibiting light emission at the tentative light emitting amount in each of the light sources of said plurality of light sources whose change is sorted into a minority side among the plus side and the minus side.

7. The display apparatus according to claim 6,

wherein the processor is configured to compute a change allowable range from the first light emitting amount to the second light emitting amount based on the change in luminance and a change amount of the change in luminance and set the second light emitting amount as a value within the computed change allowable range.

8. A display method executed by a display apparatus including a plurality of light sources and a display panel which outputs a display image based on an input image with using radiation by the plurality of light sources, the method comprising:

accepting a first input image;

computing a first light emitting amount of each of the plurality of light sources based on a luminance of the first input image;

accepting a second input image after the first input image;

computing a tentative light emitting amount of each of the plurality of light sources based on a luminance of the second input image;

comparing the first light emitting amount with the tentative light emitting amount;

imposing a limit on a change range from the first light emitting amount based on a comparison result;

deciding, using a processor, a second light emitting amount at which each of the plurality of light sources emits light based on the limit in a case where the display image is outputted based on the second input image in accordance with the limit;

controlling each of the plurality of light sources based on the second light emitting amount;

accepting a third input image prior to the first input image and the second input image; and

computing a third light emitting amount of each of the plurality of light sources based on the third input image,

wherein the deciding the second light emitting amount includes deciding the second light emitting amount based on the first light emitting amount, the tentative light emitting amount, and the third light emitting amount; and

wherein the deciding the second light emitting amount includes setting a value of the second light emitting amount as a value within a range from a value of the first light emitting amount based on the limit in a case where a light emission change from the third light emitting amount to the first light emitting amount and another light emission change from the first light emitting amount to the tentative light emitting amount are different from each other;

wherein the processor determines whether a direction of the change from the first light emitting amount to the tentative light emitting amount is on a plus side or a minus side for each light source of said plurality of light sources and imposes a limit of prohibiting light emission at the tentative light emitting amount in each of the light sources of said plurality of light sources whose change is sorted into a minority side among the plus side and the minus side.

9. The display method according to claim 8,

wherein the imposing the limit includes further imposing a second limit on a light emission change from the first light emitting amount.

10. The display method according to claim 9,

wherein the imposing the limit includes determining whether the light emission change from the first light emitting amount to the tentative light emitting amount is a first direction or a second direction with regard to each of the plurality of light sources and imposing the second limit of prohibiting light emission at the tentative light emitting amount on the light source in which the tentative light emitting amount having either light emission change of the first direction or the second direction is set among the plurality of light sources.

11. The display method according to claim 8,

wherein the deciding the second light emitting amount includes setting the value of the second light emitting amount as the value of the first light emitting amount based on the limit in a case where the light emission change from the third light emitting amount to the first light emitting amount and the another light emission change from the first light emitting amount to the tentative light emitting amount are different from each other.

12. A display apparatus comprising:

a light source;

a display panel configured to output a display image based on an input image, with using irradiation by the light source; and

a processor coupled to a memory, configured to;

accept a third input image prior to a first input image and a second input image and accept the first input image and the second input image,

output a display image on the basis of the first input image, the second input image, or the third input image,

compute a first light emitting amount of the light source based on a luminance of the first input image, computes a tentative light emitting amount of the light source based on a luminance of the second input image, compute a third light emitting amount based on a luminance of the third input image, set a limit on a change range from the first light emitting amount based on the first light emitting amount, the tentative light emitting amount, and the third light emitting amount, and decide a second light emitting amount of the light source in a case where the second input image is displayed based on the limit,

control the light source based on the second light emitting amount;

wherein the processor is configured to decide the second light emitting amount based on the first light emitting amount, the tentative light emitting amount, and the third light emitting amount; and

wherein the processor is configured to set the value of the second light emitting amount as the value of the first light emitting amount based on the limit in a case where the light emission change from the third light emitting amount to the first light emitting amount and the another light emission change from the first light emitting amount to the tentative light emitting amount are different from each other;

wherein the processor determines whether a direction of the change from the first light emitting amount to the tentative light emitting amount is on a plus side or a minus side for each light source of said plurality of light sources and imposes a limit of prohibiting light emission at the tentative light emitting amount in each of the light sources of said plurality of light sources whose change is sorted into a minority side among the plus side and the minus side.

13. A display apparatus comprising:

a plurality of light sources;

a display panel configured to output a display image based on an input image, with using irradiation by the plurality of light sources; and

a processor coupled to a memory, configured to;

accept a first input image and a second input image,

compute a first light emitting amount of each of the plurality of light sources based on a luminance of the first input image,

compute a tentative light emitting amount based on a luminance of the second input image of each of the plurality of light sources,

on a basis of a comparison result between the first light emitting amount and the tentative light emitting amount, impose a limit on a change range from the first light emitting amount to a second light emitting amount of each of the plurality of light sources, and

decide the second light emitting amount in a case where the display image is outputted based on the second input image in accordance with the limit;

control each of the plurality of light sources on the basis of the second light emitting amount;

wherein processor is configured to impose a second limit on a light emission change from the first light emitting amount;

wherein the processor is configured to determine whether the light emission change from the first light emitting amount to the tentative light emitting amount is a first direction or a second direction with regard to each of the plurality of light sources and imposes the second limit of prohibiting light emission at the tentative light emitting amount on the light source in which the tentative light emitting amount having either light emission change of the first direction or the second direction is set among the plurality of light sources;

wherein the processor is configured to identify the light emission change into which fewer light sources are sorted among the first direction and the second direction as a result of sorting the light emission change of each of the plurality of light sources and decides the second light emitting amount of the light source sorted into the identified light emission change as the first light emitting amount;

wherein the processor determines whether a direction of the change from the first light emitting amount to the tentative light emitting amount is on a plus side or a minus side for each light source of said plurality of light sources and imposes a limit of prohibiting light emission at the tentative light emitting amount in each of the light sources of said plurality of light sources whose change is sorted into a minority side among the plus side and the minus side.