Sub-pixel circuit, active electroluminescent display, and driving method thereof

Abstract

The invention discloses a sub-pixel circuit, an active electroluminescent display and a driving method thereof. The sub-pixel circuit comprises at least one electroluminescent device, a first drivingtransistor or a second driving transistor and a third driving transistor, wherein the first driving transistor or the second driving transistor and the third driving transistor are connected with theelectroluminescent device; the cathode of the electroluminescent device is connected with electricity, the anode of the electroluminescent device is connected with the output end of the first drivingtransistor, the input end of the first driving transistor is connected with a signal line, the control end of the first driving transistor is connected with a scanning line; or the anode of the electroluminescent device is connected with the output end of the second driving transistor; the input end of the second driving transistor is connected with the output end of the third driving transistor;the input end of the third driving transistor is connected with electricity, the control end of the second driving transistor is connected with the scanning line, the control end of the third drivingtransistor is connected with the signal line, and resolution is improved by reducing loads on the scanning line and the signal line and changing the number of the signal lines.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a sub-pixel circuit, an active electroluminescent display and a driving method thereof. Background technique [0002] EL (Electroluminescence / Electroluminescence) devices, including: OLED (Organic Light-Emitting Diode, OLED / Organic Light Emitting Diode), LED (Light Emitting Diode, LED / Light Emitting Diode)...etc, have been widely used in the production of display products in recent years, Compared with traditional displays (CRT, LCD, etc.), its application surface shows better optical characteristics, lower power consumption performance, better product type plasticity, and PWM (Pulse Width Modulation / pulse width adjustment method) ) driving is one of the methods widely used to control EL displays. It determines the luminous brightness and gray scale by modulating the luminous time, and provides a solution for the brightness linearity of the display. [0003] The traditi...

AI Technical Summary

Problems solved by technology

However, under ideal conditions, the signal waveform in the circuit line is as shown in the ideal waveform (1), but the actual waveform after power-on is as shown in the actual waveform (2). Furthermore, when a large current is directly introduced into the chip, the rise of the actual waveform is slower than that of the chip. Ideal waveform, it will cause the problem of signal switching delay, thus limiting the development of high-resolution drive

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