Patent ID: 8896319
Filing Date: 2014-11-25
Classification: G01R,H05B

Abstract:
1. A light emitting device control circuit, controlling a light emitting array which includes a plurality of light emitting device strings, each light emitting device string having a first terminal and a second terminal and each light emitting device string including a plurality of light emitting devices connected in series, wherein the first terminals of the light emitting device strings are connected to a common node, the light emitting device control circuit comprising: a plurality of sensing nodes, respectively coupled to the second terminals of the light emitting device strings for receiving second terminal signals from the second terminals; and a short detection circuit coupled to the sensing nodes to receive the second terminal signals, for generating a plurality of comparison signals according to the second terminal signals and at least one reference signal, the short detection circuit counting a number of the comparison signals having a predetermined level and generating a short detection signal by determining whether or not the number of the comparison signals having the predetermined level is between a first setting value and a second setting value, wherein the first setting value is equal to or larger than 1, the second setting value is equal to or less than a total number of the light emitting device strings minus 1, the first setting value is less than the second setting value.