Patent ID: 8350483

Claim:
A light-emitting element driving circuit comprising: a PWM signal output circuit configured to output a plurality of PWM signals each having one logic level whose duty ratio corresponds to gradation data and each corresponding to each of a plurality of light-emitting elements, on the basis of the gradation data indicating brightness of each of the plurality of light-emitting elements; a driving signal output circuit configured to change the duty ratio of each of the plurality of inputted PWM signals to output the plurality of changed PWM signals as a plurality of driving signals, on the basis of instruction data for changing the brightness of the plurality of light-emitting elements; and a driving circuit configured to drive the plurality of light-emitting elements on the basis of a duty ratio of each of the plurality of driving, wherein the driving signal output circuit includes: an output circuit configured to output an output signal having the same period as that of each of the plurality of PWM signals and having one logic level whose duty ratio is changed on the basis of the instruction data; and a driving signal generation circuit configured to change the duty ratio of each of the plurality of PWM signals on the basis of a logic level of the output signal to generate the plurality of driving signals.