LIGHT EMITTING ELEMENT DRIVE APPARATUS AND PORTABLE APPARATUS USING SAME

摘要

A light emitting element drive apparatus capable of outputting the lowest voltage satisfying drive conditions and having high light emitting efficiency and low power loss, and a portable apparatus using the same, comprising an LED drive apparatus to which LEDs of different drive voltages required for emitting light are connected in parallel and driving one or more LEDs, wherein the LED drive apparatus 10 has drive circuits connected to the corresponding LEDs among a plurality of LEDs and driving the corresponding LEDs with luminances based on set values and power supply circuits for deciding a drive voltage value required for the highest light emission among one or more LEDs driven to emit light based on drive states of drive circuits (for example terminal voltages of the current source) and supplying a drive voltage having at least the decided value to LEDs in parallel.

主权项

1. An apparatus comprising:
one or more first light emitting elements for a first portion; one or more second light emitting elements for a second portion; a light emitting element drive apparatus to which the first light emitting elements and the second light emitting elements are connected in parallel, the light emitting element drive apparatus driving the first light emitting elements and the second light emitting elements light, wherein the light emitting element drive apparatus includes a drive circuit connected to a corresponding light emitting element of the light emitting elements, the drive circuit driving the corresponding light emitting element with luminance based on a set current value, wherein the luminances of the first and second light emitting elements are individually adjusted and even if the first and second light emitting elements having different forward voltages are simultaneously driven.