US 12,170,058 B2
Signal processing device to improve contrast of a displayed image
Jungwook Lee, Seoul (KR); and Jongmin Park, Seoul (KR)
Assigned to LG ELECTRONICS INC., Seoul (KR)
Filed by LG ELECTRONICS INC., Seoul (KR)
Filed on Oct. 12, 2021, as Appl. No. 17/450,606.
Claims priority of application No. 10-2020-0131016 (KR), filed on Oct. 12, 2020.
Prior Publication US 2022/0139310 A1, May 5, 2022
Int. Cl. G09G 3/3208 (2016.01); G06T 7/194 (2017.01)
CPC G09G 3/3208 (2013.01) [G06T 7/194 (2017.01); G09G 2320/0653 (2013.01); G09G 2320/066 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An image display apparatus comprising:
a display;
an image receiver configured to receive a first input image and a second input image; and
a signal processing device configured to:
determine whether the first input image and the second input image have substantially a same average luminance level;
control a luminance adjustment change rate of the first input image to be greater than a luminance adjustment change rate of the second input image, based on a luminance deviation between a lowest luminance level and a highest luminance level of the first input image being less than a luminance deviation between a lowest luminance level and a highest luminance level of the second input image, and based on the determine that the first input image and the second input image have the substantially the same average luminance level;
control the luminance adjustment change rate of the first input image to be less than the luminance adjustment change rate of the second input image, based on the luminance deviation between the lowest luminance level and the highest luminance level of the first input image being greater than the luminance deviation between the lowest luminance level and the highest luminance level of the second input image, and based on the determine that the first input image and the second input image have the substantially the same average luminance level; and
cause the display to display the first input image and the second input image.