US 11,815,689 B2
Electronic device
Hisao Ikeda, Zama (JP); Yoshiyuki Kurokawa, Sagamihara (JP); and Hiromichi Godo, Isehara (JP)
Assigned to Semiconductor Energy Laboratory Co., Ltd., Kanagawa-ken (JP)
Filed by Semiconductor Energy Laboratory Co., Ltd., Atsugi (JP)
Filed on Apr. 7, 2022, as Appl. No. 17/715,321.
Claims priority of application No. 2021-077330 (JP), filed on Apr. 30, 2021.
Prior Publication US 2022/0350150 A1, Nov. 3, 2022
Int. Cl. G02B 27/01 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 2027/014 (2013.01); G02B 2027/0178 (2013.01); G02B 2027/0187 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An electronic device with an eye tracking function, comprising:
a first display device;
an infrared light source; and
an optical system,
wherein a pixel in the first display device comprises a display element and a light-receiving element,
wherein the infrared light source is configured to emit infrared light,
wherein the light-receiving element is configured to detect the infrared light reflected by an eyeball,
wherein the optical system comprises:
a first optical element and a second optical element positioned on an optical path through which visible light from the first display device is sequentially transmitted to reach the eyeball; and
a third optical element and a fourth optical element which are positioned on an optical path through which the reflected infrared light enters the light-receiving element and not positioned on the optical path of the visible light from the first display device, and
wherein each of the first to fourth optical elements is an IR cut filter.