Rohm Co., Ltd.

Akimasa Maruo

Daisuke Nishinohara

Kohei Shoji

An electro-optical device includes: 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.

Electro-optical device, method of measuring characteristics of electro-optical device, and semiconductor chip

An organic EL device comprising: an organic EL element; a first transistor that controls a drive current of the organic EL element in accordance with a brightness adjustment voltage; and a temperature correction circuit that corrects the brightness adjustment voltage in accordance with a temperature; wherein the temperature correction circuit includes: a second transistor that has a same temperature characteristic as the first transistor; a resistor element that is connected to the second transistor; and an operational amplifier that controls the second transistor such that a predetermined reference voltage and a voltage across the resistor element become equal to each other; wherein the temperature correction circuit corrects the brightness adjustment voltage in accordance with an output from the operational amplifier.

Organic electroluminescence device

A potential supplied from a capacitive load drive unit to one end of a respective capacitive load is switched to an intermediate potential between a first and a second power supply potentials for a predetermined period of time prior to switching the potential of the one end of the capacitive load from the first to the second power supply potential, or vice versa, which minimizes charging and discharging currents of the load, variations of the potential supplied to the capacitive load, and hence power consumption involved, without providing a charging capacitor having a large capacitance in the capacitive load drive unit.

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Kyoto, Japan

Akimasa Maruo