公开(公告)号：US09500521B2

公开(公告)日：2016-11-22

申请号：US14453281

申请日：2014-08-06

Applicant: Samsung Electronics Co., Ltd.

Inventor： Yun-Hong Kim ,  Moo-Young Kim ,  Tae-Chan Kim ,  Kwang-Hyun Lee ,  Seok-Yong Hong

IPC: G01J1/46 ,  G01J1/42 ,  G06F1/32

CPC classification number: G01J1/4204 ,  G01J1/46 ,  G06F1/3265 ,  Y02D10/153

Abstract: An ambient light sensor includes a photoelectric conversion unit, a current control unit, a signal conversion unit and a comparison unit. The photoelectric conversion unit provides a photo current having a magnitude corresponding to illuminance of incident light to a first node. The current control unit generates a control current exponentially proportional to an elapse time based on a clock signal, provides the control current to the first node, and outputs a digital code corresponding to the elapse time in response to a reset signal. The signal conversion unit generates a comparison voltage logarithmically proportional to a sum of the photo current and the control current. The comparison unit generates the reset signal by comparing a magnitude of the comparison voltage and a magnitude of a reference voltage. The ambient light sensor generates the digital code effectively representing illuminance of ambient light that eyes of a human being perceives.

Abstract translation: 环境光传感器包括光电转换单元，电流控制单元，信号转换单元和比较单元。 光电转换单元提供具有对应于入射光的照度的大小的光电流到第一节点。 当前控制单元基于时钟信号产生与经过时间成正比的控制电流，向第一节点提供控制电流，并响应于复位信号输出对应于经过时间的数字码。 信号转换单元产生与光电流和控制电流之和成正比的对比电压。 比较单元通过比较比较电压的大小和参考电压的大小来产生复位信号。 环境光传感器产生有效地表示人的眼睛感知的环境光的照度的数字代码。