DISPLAY DEVICE OF ACTIVE MATRIX TYPE

摘要

A display device of active matrix type allows reducing display brightness non-uniformity that is caused by initial variation and fluctuation over time in a driving transistor for emissive elements in pixel circuits. The display device includes pixel circuits, a measurement circuit and a gradation voltage supplying circuit. Each pixel circuit includes the driving transistor and an input circuit. The measurement circuit includes a constant current supplying circuit for generating and supplying one or more constant currents to the input circuit of the pixel circuits in a time division manner. The measurement circuit A/D-converts output voltages of the constant current supplying circuit and calculates data relating to electron mobility and threshold value of the driving transistor. The gradation voltage supplying circuit supplies to the pixel circuits a corrected gradation voltage, which is data corrected on the basis of data calculated from the measurement circuit.

主权项

1. A driver circuit for driving a plurality of pixel circuits, each pixel circuit including an emissive element of current control type, comprising:
a converter configured to precharge a driving transistor for driving the pixel circuit, and read a base voltage of the driving transistor as a threshold voltage after a given time for discharging; a storage configured to store the threshold voltage for each of the plurality of pixel circuits; a calculator configured to calculate a driving gradation data by multiplying an inputted gradation data by a correction coefficient derived from the threshold voltage and adding the threshold voltage; and a driver configured to drive each of the plurality of pixel circuits with the driving gradation data.