US 12,078,542 B2
Optical sensor circuit
Chih-Lung Lin, Tainan (TW); Chia-En Wu, Chiayi (TW); Chia-Lun Lee, New Taipei (TW); Jui-Hung Chang, Taichung (TW); and Jian-Shen Yu, Hsinchu (TW)
Assigned to Au Optronics Corporation, Hsinchu (TW); and National Cheng-Kung University, Tainan (TW)
Filed by Au Optronics Corporation, Hsinchu (TW); and National Cheng-Kung University, Tainan (TW)
Filed on May 11, 2022, as Appl. No. 17/742,384.
Application 17/742,384 is a division of application No. 16/594,085, filed on Oct. 7, 2019.
Claims priority of application No. 107140855 (TW), filed on Nov. 16, 2018; and application No. 108123500 (TW), filed on Jul. 3, 2019.
Prior Publication US 2022/0276097 A1, Sep. 1, 2022
Int. Cl. G01J 3/51 (2006.01); G01J 3/50 (2006.01)
CPC G01J 3/51 (2013.01) [G01J 3/505 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An optical sensor circuit, comprising:
a first sensor, coupled to a first node, the first sensor configured to generate a first photocurrent according to a first color light and a second color light sensing an ambient light;
a second sensor, coupled between the first node and a first system voltage or between the first node and a second system voltage, the second sensor configured to generate a second photocurrent according to a third color light sensing the ambient light; and
an output stage circuit, coupled between the first node and the reference voltage, the output stage circuit transmitting a first voltage of the first node to an output line according to a first driving signal,
wherein in a sensing phase, the first sensor adjusts a voltage level of the first voltage according to the first photocurrent when the first sensor senses the first color light and the second color light,
wherein the first sensor comprises:
a first color filter and a second color filter;
a first transistor, a first end of the first transistor receiving a second driving signal, a second end and a control end of the first transistor commonly coupled to the first node, wherein the first color filter covers the first transistor; and
a second transistor, a first end of the second transistor receiving the second driving signal, a second end and a control end of the second transistor commonly coupled to the first node, wherein the second color filter covers the second transistor,
wherein the second sensor comprises:
a third color filter; and
a third transistor, a first end and a control end of the third transistor commonly coupled to the first system voltage, and a second end of the third transistor coupled to the first node, wherein the third color filter covers the third transistor,
wherein the first color filter, the second color filter, and the third color filter respectively have a plurality of different pass wavelengths.