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Light emitting element drive apparatus and portable apparatus using same

  • US 9,717,124 B2
  • Filed: 08/19/2015
  • Issued: 07/25/2017
  • Est. Priority Date: 05/31/2002
  • Status: Expired due to Fees
First Claim
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1. An apparatus comprising:

  • first light emitting elements configured to emit a first color of light at a first luminance, an anode of at least one of the first light emitting elements is electrically connected to an anode of another of the first light emitting elements;

    second light emitting elements configured to emit a second color of the light at a second luminance, an anode of at least one of the second light emitting elements is electrically connected to an anode of another of the second light emitting elements;

    light emitting element drive circuitry configured to drive said at least one the first light emitting elements to emit the first color of the light at the first luminance, the light emitting element drive circuitry is configured to drive said at least one the second light emitting elements to emit the second color of the light at the second luminance; and

    power supply circuitry configured to decide a lowest drive voltage required for enabling a light emitting element having a highest forward voltage among the first light emitting elements and the second light emitting elements to be driven at a set current value to emit the light.

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