Display device and method for operating same

Inventors: Sorin Kim (Seoul, KR); Byungwoo Ryu (Seoul, KR)

Assignee: LG ELECTRONICS INC.

G09G3/2096 G09G3/3208 G09G2320/0633 G09G2320/0646 G09G2320/103 G09G2354/00 G09G2370/16

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Quick Facts

Patent No.: US 12706020
App. No.: 19/170,481
Granted: Aug 11, 2026
Kind: B2

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Abstract

A display device and a method of operating the same are disclosed. According to at least one of the various embodiments of the present disclosure, a display device includes a display outputting an input image; and a processor controlling the application of a brightness reduction algorithm to the input image, in which the processor, if calculating the difference in Average Picture Level (APL) values for determining whether to apply the brightness reduction algorithm, may determine whether to update the reference frame based on the difference between APL values of the current frame and the reference frame.

Claims (36)

1 . A display device comprising:

a display configured to display input images; and

a processor configured to apply a brightness reduction algorithm to the input images,

wherein the processor is configured to:

obtain an Average Picture Level (APL) value of a current frame of the input images;

obtain a difference between the APL value of the current frame and an APL value of a set reference frame;

apply the brightness reduction algorithm to the current frame based on the difference being greater than a first threshold;

updating the reference frame to the current frame based on the difference being greater than a first threshold;

maintaining the reference frame as the set reference frame based on the difference being less than or equal to the first threshold; and

cause the display to display the current frame having the brightness reduction algorithm applied.

2 . The display device of claim 1 ,

wherein the processor is configured to maintain the reference frame for comparison with an APL value of a next frame after the current frame based on the difference between the APL value of the current frame and the APL value of the set reference frame being less than or equal to the first threshold.

3 . The display device of claim 2 ,

wherein the processor is configured to set the current frame as the reference frame for comparison with an APL value of a next frame after the current frame based on the difference between the APL value of the current frame and the APL value of the reference frame being greater than the first threshold.

4 . The display device of claim 3 ,

wherein the processor is configured to increase a still image determination time count based on the difference between the APL value of the current frame and the APL value of the set reference frame being less than or equal to the first threshold.

5 . The display device of claim 4 ,

wherein the processor is configured to determine whether the still image determination time count exceeds a second threshold after the still image determination time count is increased.

6 . The display device of claim 5 ,

wherein the processor is configured to determine that the current frame corresponds to a still image based on a determination that the still image determination time count exceeds the second threshold.

7 . The display device of claim 6 ,

wherein the processor is configured to apply the brightness reduction algorithm to the current frame based on a determination that the current frame corresponds to a still image.

8 . The display device of claim 7 ,

wherein applying the brightness reduction algorithm comprises linearly reducing brightness of the current frame at a predetermined slope until a target brightness is reached.

9 . The display device of claim 6 ,

wherein the processor is configured to determine that the current frame corresponds to a moving image based on a determination that the still image determination time count does not exceed the second threshold.

10 . The display device of claim 9 ,

wherein the processor is configured to not to apply the brightness reduction algorithm to the current frame based on a determination that the current frame corresponds to a moving image.

11 . The display device of claim 9 ,

wherein after a determination that the current frame corresponds to a still image or a moving image, the processor is configured to calculate a difference between an APL value of a next frame and the APL value of the current frame set as the reference frame to determine whether to apply the brightness reduction algorithm to the next frame.

12 . The display device of claim 3 ,

wherein the processor is configured to reset a still image determination time count based on setting the current frame as the reference frame.

13 . The display device of claim 12 ,

wherein the processor is configured to determine whether the current frame corresponds to a still image by comparing the APL value of the current frame set as the reference frame and the APL value of the next frame after the current frame.

14 . The display device of claim 1 ,

wherein the processor is configured to determine that the current frame corresponds to a still image based on the reference frame not having been changed for at least a predetermined period of time or for at least a predetermined number of frames.