Organic Light-Emitting Diode Display

摘要

A display may have an array of organic light-emitting diode display pixels. Each display pixel may have a light-emitting diode that emits light under control of a drive transistor. Each display pixel may also have control transistors for compensation and programming operations. Each display pixel may have six thin-film transistors and one capacitor. One of the six transistors may serve as the drive transistor and may be compensated using the remaining five transistors and the capacitor. The capacitor may have a first terminal coupled to the gate of the drive transistor and a second terminal coupled to the light-emitting diode. In one embodiment, two scan control signals and two emission control signals may be used for each row of display pixels. In another embodiment, a single scan control signal and a single emission control signal may be formed for each row of display pixels.

主权项

1. A display pixel, comprising:
an organic light-emitting diode; a plurality of transistors one of which is a drive transistor that supplies a current to the organic light-emitting diode and that has a threshold voltage; and a capacitor coupled to the drive transistor and the organic light-emitting diode, wherein the transistors are controlled using first, second, and third phases in each of a plurality of image frames, wherein the first phase is a reset and data writing phase in which data is loaded into the display pixel, the second phase is a threshold voltage compensation phase in which an initialization voltage is placed on a gate of the drive transistor, and the third phase is an emission phase in which the drive transistor supplies current to the organic light-emitting diode that is independent of the threshold voltage and that is responsive to the data that has been loaded into the display pixel.