Light-emitting display

Abstract

A pixel circuit of a light-emitting display that reduces the influence of kickback generated by parasitic capacitance. The pixel circuit includes first to fourth transistors, a capacitor, and a light-emitting element. The first and second transistors are serially coupled to each other and turned on in response to a first control signal. The capacitor is coupled in parallel with the first and second transistors. The third transistor supplies a data voltage to a first electrode of the capacitor in response to a select signal. The fourth transistor outputs a current corresponding to its gate-source voltage, which is based on the voltage of the capacitor. The light-emitting element emits light corresponding to the current from the fourth transistor.

Description

technical field [0001] The present invention relates to a light-emitting display, in particular to an organic light-emitting display using organic materials to emit light. Background technique [0002] Organic light emitting displays generally emit light using organic light emitting elements that emit light using organic materials. The NxM organic light emitting cells arranged in a matrix form can be driven using voltage or current to display images. Since the organic light emitting unit has diode characteristics, it may also be called an organic LED (light emitting diode), which may include an anode (ITO), an organic thin film, and a cathode (metal). The organic thin film may have a multilayer structure including an emission layer (EML), an electron transport layer (ETL), and a hole transport layer (HTL) for balancing electrons and holes to improve luminous efficiency. The organic thin film may further include an electron injection layer (EIL) and a hole injection layer (...

AI Technical Summary

Problems solved by technology

Thus, the organic light emitting display may not display images correctly because the driving transistors of the pixels may have different threshold voltages

Images