US 12,326,347 B2
Under-display sensor
Byung Il Min, Zheijang (KR)
Assigned to HANGZHOU SINGLE MICRO ELECTRONIC CO., LTD., Zheihang (CN)
Filed by Hangzhou Single Micro Electronic Co., LTD., Zheijang (CN)
Filed on Jan. 15, 2021, as Appl. No. 17/150,435.
Claims priority of application No. PCT/CN2020/072107 (WO), filed on Jan. 15, 2020; application No. PCT/CN2020/072108 (WO), filed on Jan. 15, 2020; application No. PCT/CN2020/074019 (WO), filed on Jan. 23, 2020; and application No. 202110037625.5 (CN), filed on Jan. 12, 2021.
Prior Publication US 2021/0285764 A1, Sep. 16, 2021
Int. Cl. G01C 3/08 (2006.01); G01C 3/02 (2006.01); G01S 17/86 (2020.01); G02B 5/30 (2006.01)
CPC G01C 3/02 (2013.01) [G01S 17/86 (2020.01); G02B 5/3025 (2013.01); G09G 2360/142 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An under-display sensor disposed under a display having a pixel configured for generating light, and a display retardation layer and a display polarization layer, both being disposed over the pixel, comprising:
an optical sensor, having an emitter configured for emitting a sensing light and a receiver configured for detecting an externally-reflected light reflected from an object and returned by the sensing light;
a sensor polarization layer, being disposed over the optical sensor and having a polarization axis inclined at a first angle; and
a sensor retardation layer, being disposed over the sensor polarization layer and having a slow axis inclined at the first angle with respect to the polarization axis,
wherein the slow axis of the sensor retardation layer and a slow axis of the display retardation layer are parallel, and the polarization axis of the display polarization layer is inclined at a second angle with respect to the slow axis of the display retardation layer, and
wherein a difference between the second angle and the first angle is 90 degrees.