US 11,790,817 B2
Method for operating display device
Shunpei Yamazaki, Tokyo (JP); and Takayuki Ikeda, Kanagawa (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Appl. No. 17/633,269
Filed by SEMICONDUCTOR ENERGY LABORATORY CO., LTD., Atsugi (JP)
PCT Filed Jul. 28, 2020, PCT No. PCT/IB2020/057090
§ 371(c)(1), (2) Date Feb. 7, 2022,
PCT Pub. No. WO2021/028755, PCT Pub. Date Feb. 18, 2021.
Claims priority of application No. 2019-147373 (JP), filed on Aug. 9, 2019; and application No. 2019-190103 (JP), filed on Oct. 17, 2019.
Prior Publication US 2022/0383783 A1, Dec. 1, 2022
Int. Cl. G09G 3/00 (2006.01)
CPC G09G 3/006 (2013.01) [G09G 2320/045 (2013.01); G09G 2360/145 (2013.01); G09G 2360/16 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for operating a display device comprising a display portion and a sensor portion, wherein the display portion comprises a matrix of pixels in m rows by n columns, where m and n are each an integer greater than or equal to 2, and the sensor portion comprises a photoelectric conversion element, the method comprising:
dividing the display portion into a first region including first pixels and a second region including second pixels;
emitting first light from the first pixels, and detecting a luminance of the first light by the photoelectric conversion element;
emitting second light from the second pixels, and detecting a luminance of the second light by the photoelectric conversion element;
comparing the luminance of the first light and the luminance of the second light;
dividing one of the first region and the second region into a third region including third pixels and a fourth region including fourth pixels on the basis of a result of the comparison;
emitting third light from the third pixels, and detecting a luminance of the third light by the photoelectric conversion element;
emitting fourth light from the fourth pixels, and detecting a luminance of the fourth light by the photoelectric conversion element;
comparing the luminance of the third light and the luminance of the fourth light; and
detecting, in the third pixels and the fourth pixels, a defective pixel having a defect.