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Circuit for driving light-emitting element, and cellular phone

  • US 8,279,209 B2
  • Filed: 11/12/2008
  • Issued: 10/02/2012
  • Est. Priority Date: 11/16/2007
  • Status: Active Grant
First Claim
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1. A light-emitting element driving circuit, which drives a light emitting element used in an electronic device, installed on a second substrate connected via a signal line to a first substrate, on which is mounted a control circuit configured to generate an LED drive control signal, the light-emitting element driving circuit comprising:

  • a pulse generation unit configured to start and stop an operation based on the LED drive control signal, and output an LED drive signal when the pulse generation unit is in an active state;

    an LED oscillator configured to supply a reference pulse signal to the pulse generation unit; and

    an LED driver unit configured to cause a light-emitting element to perform a flickering operation based on the LED drive signal, whereinthe LED oscillator is a circuit having a lower accuracy in frequency of the reference pulse signal, compared to a control oscillator in the control circuit mounted on the first substrate.

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