US 2016/0240127 A1Published application

Amoled pixel circuit and driving method

AssigneeBoe Technology Group Co., Ltd.

InventorsLiye DUAN, Lirong WANG, Zhongyuan WU

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Abstract

An AMOLED pixel circuit and driving method are disclosed. The AMOLED pixel circuit comprises a first transistor(T1), a second transistor(T2), a third transistor(T3), a fourth transistor(T4), a fifth transistor(T5), a sixth transistor(T6), a seventh transistor(T7), an eighth transistor(T8), a first capacitor(C1), a second capacitor(C2), a current source and a light-emitting device(OLED). The AMOLED pixel circuit can perform a rapid charging in a low gray scale state; different currents may be provided according to information on a high or low gray scale, and thus the AMOLED pixel circuit may be applied widely; an output current during a light-emitting period is a normal operational current of the light-emitting device; therefore not only a charging process is expedited, but also a normal operation of the light-emitting device is ensured.

An AMOLED pixel circuit comprising a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, a sixth transistor, a seventh transistor, an eighth transistor, a first capacitor, a second capacitor, a current source and a light-emitting device;

a gate of the first transistor is connected with a gate of the eighth transistor, a gate of the fifth transistor and a charging signal scan control unit, respectively;
a drain of the first transistor is connected with a drain of the second transistor, a drain of the third transistor, a first terminal of the second capacitor and a power supply, respectively;
a source of the first transistor is connected with a gate of the third transistor and a first terminal of the first capacitor, respectively;
a gate of the eighth transistor is connected with a drain of the eighth transistor;
a source of the eighth transistor is connected with a second terminal of the second capacitor, a gate of the second transistor and a drain of the sixth transistor, respectively;
a gate of the third transistor is connected with a gate of the fourth transistor;
a source of the third transistor is connected with a second terminal of the first capacitor, a drain of the fifth transistor and a source of the fourth transistor, respectively;
a source of the second transistor is connected with a drain of the fourth transistor;
a source of the fourth transistor is connected with a drain of the seventh transistor;
a gate of the seventh transistor is connected with a trigger signal control unit;
a source of the seventh transistor is connected with a positive electrode of the light-emitting device;
a negative electrode of the light-emitting device is grounded;
a gate of the sixth transistor is connected with a discharging signal scan control unit;
a source of the fifth transistor is connected with a source of the sixth transistor and a first terminal of the current source, respectively;
and a second terminal of the current source is grounded.

12 more elements

Facts

Application

14/349,860Filed 13 Aug 2013

Priority

CN 201310214664.331 May 2013

Published

18 Aug 2016

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

G09G 3/2007
For presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged…:…
G09G 3/3241
With pixel circuitry controlling the current through the light-emitting element: the current through the light-emitting element being set using a…
G09G 3/3258
Using an active matrix: with pixel circuitry controlling the voltage across the light-emitting element
G09G 2300/0814
Several active elements per pixel in active matrix panels: used for selection purposes, e.g. logical AND for partial update

Abstract

Claims15