US 11,990,098 B2
Display brightness control device
Jae Hoon Lee, Busan (KR); and Sung Qwan Oh, Gyeonggi-do (KR)
Assigned to SAPIEN SEMICONDUCTORS INC., Ulsan (KR)
Appl. No. 17/918,660
Filed by SAPIEN SEMICONDUCTORS INC., Ulsan (KR)
PCT Filed May 24, 2021, PCT No. PCT/KR2021/006465
§ 371(c)(1), (2) Date Oct. 13, 2022,
PCT Pub. No. WO2021/241970, PCT Pub. Date Dec. 2, 2021.
Claims priority of application No. 10-2020-0062424 (KR), filed on May 25, 2020.
Prior Publication US 2023/0144029 A1, May 11, 2023
Int. Cl. G09G 3/3283 (2016.01); G06V 10/60 (2022.01); G09G 3/32 (2016.01); G09G 3/325 (2016.01)
CPC G09G 3/3283 (2013.01) [G06V 10/60 (2022.01); G09G 3/325 (2013.01); G09G 3/32 (2013.01); G09G 2320/0233 (2013.01); G09G 2320/0626 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A display luminance control device for controlling luminance of a display device with a pixel circuit comprising a switching transistor for operating a light-emitting diode (LED), the display luminance control device comprising:
a processor configured to:
calculate an average-luminance value from an inputted video data;
calculate a luminance-variation value by which the luminance is to be reduced when the calculated average-luminance value is greater than a preset reference-luminance value; and
a current control circuit configured to control a driving current of the pixel circuit according to the luminance-variation value, wherein the current control circuit comprises:
a first amplifier configured to produce an output voltage, and
an adjustable resistor configured to control an amount of a voltage-amplification value of the first amplifier based on the luminance-variation value, and
wherein the switching transistor connected to a pixel driving line through which an amount of current flowing through the pixel driving line for driving the LED is linearly changed based on the output voltage.