Patent ID: 9741276
Date: 2017-08-22
CPC Classifications: G09G

Claim:
1. An electro-optical device, comprising: a display unit having a plurality of pixel circuits each including a driving transistor and a light emitting element that emits light depending on a current output from the driving transistor when a voltage is applied to a gate terminal of the driving transistor; and a test unit having a test unit connection switch connected to the gate terminal of the driving transistor of each of the pixel circuits, and a test voltage supply circuit connected to the gate terminal of each of the driving transistors through the test unit connection switch and configured to supply a test voltage to the gate terminal of each of the driving transistors when the test unit connection switch is turned on, wherein the test voltage supply circuit comprises a constant current source, wherein a voltage level of the test voltage is determined depending on a current level set in the constant current source, wherein the test voltage supply circuit comprises a test transistor including a gate terminal with which the gate terminal of the driving transistor is electrically connected under control of the test unit connection switch, and wherein the constant current source is connected to a drain terminal of the test transistor and the gate terminal of the test transistor is connected to the drain terminal of the test transistor.