Field-effect transistor operating point state reset circuit, method and oled display thereof

Abstract

A field effect transistor working point state reset circuit comprises a field effect transistor, a first switch unit, a second switch unit and a third switch unit, wherein the first switch unit is provided with a first end, a second end and a first control end, the first end is connected with a first electric potential, the second end is connected with a source electrode of the effect transistor, and the first control end receives a first control signal; the second switch unit is provided with a third end, a fourth end and a second control end, the third end is connected with a drain electrode of the field effect transistor, the fourth end is grounded through a load, and the second control end receives a second control signal; the third switch unit is provided with a fifth end, a sixth end and a third control end, the fifth end is connected with a gate electrode of the field effect transistor, the sixth end is connected with a second electric potential, the third control end receives a third control signal, the absolute value of the difference of the first electric potential and the second electric potential is larger than the absolute value of the gate source voltage range in which the field effect transistor controls the work of the load, and in the scheduled time before the field effect transistor begins to control the work of the load, a reset operation is conducted on the field effect transistor through the first switch unit, the second switch unit and the third switch unit.

Description

technical field [0001] The present application relates to a field effect transistor operating point state resetting circuit, a field effect transistor operating point state resetting method, and an organic light emitting diode (OLED) display using the operating point state resetting circuit. Background technique [0002] In an OLED display, an active matrix organic light emitting diode (AMOLED) pixel driving circuit uses a field effect transistor, especially a thin film field effect transistor (TFT) to form a pixel circuit to drive the OLED for image display. However, field effect transistors, especially TFTs, have a unique hysteresis phenomenon in the working process, which will cause poor luminous response characteristics of the display panel. [0003] The hysteresis characteristic of the field effect transistor means that when the gate-source voltage of the field effect transistor changes, although the same voltage is applied, the operating current value passing through t...

AI Technical Summary

Problems solved by technology

[0009] That is to say, due to the residual light-emitting drive current due to the previous display data, the expected drive current cannot be obtained after the new display data is exchanged and written.

As a result, in the initial part of the switched screen, it suffers from the effect of the screen before switching, and when a dynamic screen is displayed, the screen appears blurred

Especially when there is text scrolling on the display screen, it will show a very significant adverse effect of low image quality

Images