Search International and National Patent Collections
|1. (WO2017154128) SEMICONDUCTOR LIGHT-EMITTING DEVICE|
|Title:||SEMICONDUCTOR LIGHT-EMITTING DEVICE|
The present invention comprises: a light-emitting element group configured from a plurality of columns of serially connected light-emitting elements, one of the ends from each of the plurality of columns of the light-emitting elements being collectively connected to a power source; a plurality of current control elements, provided to correspond to the plurality of columns, and being connected to each of the columns of the light-emitting elements at the other end thereof, for controlling the current flowing through the light-emitting elements; a forward voltage monitoring circuit for monitoring, for each of the columns, the total forward voltage across the light-emitting elements; and a control circuit for controlling the current control elements, on the basis of the total forward voltage across the light-emitting elements from each of the columns detected by the forward voltage monitoring circuit, in such a manner that the variations in the total forward voltage across the plurality of columns of the light-emitting elements reach a threshold value or lower.