Patent ID: 8203524
Filing Date: 2012-06-19
Classification: H05B

Abstract:
1. A light-emitting element driving circuit comprising: a luminosity determining unit which acquires luminance information from a luminance sensor, determines luminosity, outputs a luminosity determination result, and outputs luminosity change information; a brightness setting unit which sets brightness based on the luminosity determination result of the luminosity determining unit, outputs brightness setting information, and outputs brightness change information; a light-emitting element driving unit which drives a light-emitting element with a current of a current value corresponding to the brightness setting information from the brightness setting unit; a detecting and comparing unit which detects a terminal voltage of a first terminal of the light-emitting element and compares with a predetermined voltage; a voltage boost determining unit which determines whether or not a terminal voltage of a second terminal of the light-emitting element is to be boosted based on at least one of the luminosity change information and the brightness change information, and an output of the detecting and comparing unit; and a voltage boosting circuit section which boosts the terminal voltage of the second terminal of the light-emitting element when the voltage boost determining unit determines that the voltage is to be boosted and which does not boost the terminal voltage of the second terminal of the light-emitting element when the voltage boost determining unit determines that the voltage is not to be boosted.