×

Sensing devices and electronic apparatuses using the same

  • US 8,575,535 B2
  • Filed: 05/28/2010
  • Issued: 11/05/2013
  • Est. Priority Date: 06/03/2009
  • Status: Active Grant
First Claim
Patent Images

1. A sensing device for sensing light and generating a sensing output signal indicating intensity of the light, comprisinga photo element for sensing the light and generating a current signal at a first node;

  • a comparison circuit, coupled to the first node, for receiving the current signal, wherein the comparison circuit comprises a filter for filtering a high-frequency component on the current signal, and the comparison circuit generates a result signal according to the filtered current signal;

    a logic circuit for receiving the result signal and performing a logic operation to the result signal to generate the sensing output signal;

    a reset capacitor having a first terminal receiving a reset signal and a second terminal coupled to the first node, wherein when the sensing device is sensing the light, the reset signal is asserted; and

    a feedback capacitor coupled between the logic circuit and the first node, wherein the reset capacitor and the feedback capacitor have large capacitances.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×