Image display apparatus capable of improving luminance of display while satisfying regulation on power consumption

Inventor: Chasung Hwang (Seoul, KR)

Assignee: LG ELECTRONICS INC.

G09G3/3208 G09G2310/08 G09G2320/0233 G09G2330/023 G09G2360/16

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Quick Facts

Patent No.: US 12,688,824
App. No.: 19/003,441
Granted: Jul 21, 2026
Kind: B2

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Abstract

The image display apparatus according to an embodiment of the present disclosure comprises: an organic light emitting panel; a signal processing device to perform signal processing on an input image and output an image signal; a timing controller to drive the organic light emitting panel based on the image signal; and a power supply to supply a display driving voltage, wherein the signal processing device is configured to calculate a luminance level based on the average picture level of the input image, calculate output luminance level based on the luminance level and an offset level corresponding to current information detected in response to the display driving voltage in the timing controller, and output an image signal corresponding to the output luminance level. Accordingly, it is possible to improve the luminance of the display while satisfying regulation on power consumption.

Claims (31)

1 . An image display apparatus comprising:

an organic light emitting panel;

a signal processing device configured to perform signal processing on an input image and output an image signal;

a timing controller configured to drive the organic light emitting panel based on the image signal from the signal processing device; and

a power supply configured to supply a display driving voltage to the timing controller,

wherein the signal processing device is configured to calculate a luminance level based on an average picture level of the input image, calculate an output luminance level based on the luminance level and an offset level corresponding to current information detected in response to the display driving voltage in the timing controller, and output the image signal corresponding to the output luminance level, and

wherein, in a case in which the detected current information is equal to or higher than a reference level, the signal processing device is configured to output the image signal corresponding to the calculated luminance level based on the average picture level of the input image, without the offset level.

2 . The image display apparatus of claim 1 , wherein the signal processing device is configured to, in a case in which the detected current information is lower than a reference level, increase the offset level in response to an increase of a difference between the detected current information and the reference level.

3 . The image display apparatus of claim 1 , wherein, in a case in which the average picture level of the input image is a first level and the level of the detected current information is a second level lower than a reference level, the signal processing device is configured to output the image signal based on the first level and a first offset level corresponding to the second level, and

in a case in which the average picture level of the input image is a third level higher than the first level and the level of the detected current information is the second level lower than the reference level, the signal processing device is configured to output the image signal based on the third level and a second offset level lower than the first offset level.

4 . The image display apparatus of claim 1 , wherein the signal processing device is configured to decrease the offset level as the level of the display driving voltage increases.

5 . The image display apparatus of claim 1 , wherein the signal processing device is configured to decrease the offset level as a cumulative operating period of the display increases.

6 . The image display apparatus of claim 1 , wherein the signal processing device comprises:

an average picture level calculator configured to calculate the average picture level of the input image;

an offset level calculator configured to calculate the offset level based on the detected current information from the timing controller; and

a data output part configured to output an image signal corresponding to the output luminance level calculated based on the average picture level and the offset level.

7 . The image display apparatus of claim 1 , wherein the timing controller is configured to output the display driving voltage or a first current corresponding to the display driving voltage, detect the first current, and transmit detected current information of the first current to the signal processing device.

8 . The image display apparatus of claim 7 , wherein the signal processing device is configured to, in a case in which the detected current information is lower than a reference level, increase the offset level in response to a increase of a difference between the detected current information and the reference level.

9 . The image display apparatus of claim 7 , wherein, in a case in which the average picture level of the input image is a first level and the level of the detected current information is a second level lower than the reference level, the signal processing device is configured to output the image signal based on the first level and a first offset level corresponding to the second level.

10 . The image display apparatus of claim 9 , wherein, in a case in which the average picture level of the input image is the first level and the level of the detected current information is a third level lower than the reference level and higher than the second level, the signal processing device is configured to output the image signal based on the first level and a second offset level corresponding to the third level.

11 . An image display apparatus comprising:

an organic light emitting panel;

a signal processing device configured to perform signal processing on an input image and output an image signal;

a timing controller configured to drive the organic light emitting panel based on the image signal from the signal processing device; and

a power supply configured to supply a display driving voltage to the timing controller,

wherein, in a case in which the average picture level of the input image is a first level and a level of the detected current information is a second level lower than a reference level, the signal processing device is configured to output the image signal based on the first level and a first offset level corresponding to the second level.

12 . The image display apparatus of claim 11 , wherein, in a case in which the average picture level of the input image is the first level and the level of the detected current information is a third level lower than the reference level and higher than the second level, the signal processing device is configured to output the image signal based on the first level and a second offset level corresponding to the third level.

13 . The image display apparatus of claim 12 , wherein the signal processing device is configured to control the second offset level to be lower than the first offset level.

14 . The image display apparatus of claim 11 , wherein, in a case in which the average picture level of the input image is a first level and the level of the detected current information is a fourth level equal to or higher than the reference level, the signal processing device is configured to output the image signal corresponding to the first level.

15 . The image display apparatus of claim 11 , wherein the signal processing device is configured to decrease the output luminance level of the image signal outputted from the signal processing device as the average picture level increases.