公开(公告)号：US20160128146A1

公开(公告)日：2016-05-05

申请号：US14635740

申请日：2015-03-02

Applicant: PIXART IMAGING INC.

Inventor： CHIA-HSUN WU ,  PENG-SHENG CHEN ,  HSIANG-WEI HWANG ,  JUI-TE CHIU

IPC: H05B33/08 ,  H03M1/66

CPC classification number: H05B33/0827 ,  H03M1/742

Abstract: A current-steering DAC circuit for switching a light emitting diode, the current-steering DAC circuit including a current-steering DAC and a resistor. The current-steering DAC outputs a stable current and includes a plurality of current-steering units with a first output end and a second output end. The first output end is electrically connected to the light emitting diode, and the second output end is electrically connected to the resistor. Each of the current-steering units includes a current source and a switching circuit. A first end of the switching circuit is electrically connected to the current source. A second end and a third end of the switching circuit are electrically connected to the first output end and the second output end of the current-steering DAC, respectively. The switching circuit is controlled by a switching signal so as to selectively connect one of the second end and the third end to the first end.

Abstract translation: 用于切换发光二极管的电流导向DAC电路，所述电流导向DAC电路包括电流导向DAC和电阻器。 电流导向DAC输出稳定的电流并且包括具有第一输出端和第二输出端的多个电流转向单元。 第一输出端电连接到发光二极管，第二输出端电连接到电阻器。 每个电流转向单元包括电流源和开关电路。 开关电路的第一端电连接到电流源。 开关电路的第二端和第三端分别电连接到电流 - 转向DAC的第一输出端和第二输出端。 开关电路由开关信号控制，以便选择性地将第二端和第三端之一连接到第一端。