Patent ID: 9036211
Filing Date: 2015-05-19
Classification: B41J,G06K

Abstract:
1. A light emitting apparatus comprising: a plurality of light emitting elements; a drive circuit provided to each of the plurality of light emitting elements, including a transistor which supplies a drain current controlled by a gate-source voltage to the light emitting element and a capacitor having one end connected to the gate of the transistor; and a signal supply circuit for receiving a digital gradation signal and outputting an analog voltage signal to the drive circuit, including a memory that stores a correction coefficient for each of the plurality of light emitting elements, a computation circuit configured to correct the input digital gradation signal to generate a corrected digital gradation signal, and a digital-to-analog converter to convert the corrected digital gradation signal to the analog voltage signal, wherein the drive circuit is configured to conduct an auto-zero operation in which the gate-source voltage of the transistor is reduced to a threshold voltage of the transistor by flowing the drain current to the capacitor, and wherein the computation circuit is configured to generate the corrected digital gradation signal by multiplying the correction coefficient to the input digital gradation signal subtracted by a particular signal common to the plurality of light emitting elements.