US 9,311,852 B2Granted

Pixel circuit and organic light-emitting display comprising the same

AssigneeBoe Technology Group Co., Ltd.

InventorYing Wang

Life of this patent

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Abstract

Provided are a pixel circuit and an organic light-emitting display. The pixel circuit comprises a driving thin film transistor and a light-emitting diode which is connected between a low level input terminal and a high level input terminal of a driving power supply in series, the pixel circuit further comprises a first capacitor and a driving control unit, a first terminal of the first capacitor is electrically connected with a first electrode of the driving thin film transistor through the driving control unit, a second terminal of the first capacitor is connected with a gate of the driving thin film transistor, a second electrode of the driving thin film transistor is electrically connected with the gate of the driving thin film transistor through the driving control unit, the driving control unit is connected with a gate line and a data line. Since respective pixel circuits may output uniform currents, the brightness of light-emitting diodes in the pixel circuits is uniform, and in turn the display brightness of the organic light-emitting display comprising the pixel circuits is uniform.

Claims17

Dependent claims

A pixel circuit comprising a driving thin film transistor and a light-emitting diode, wherein the light-emitting diode and the driving thin film transistor are connected between a low level input terminal and a high level input terminal of a driving power supply in series, wherein the pixel circuit further comprises a first capacitor and a driving control unit, and wherein the driving control unit is connected with a gate line and a data line and comprises a second driving control transistor and a third driving control transistor, wherein

a gate of the second driving control transistor is connected with the gate line, a first electrode of the second driving control transistor is connected with the second electrode of the driving thin film transistor, a second electrode of the second driving control transistor is connected with the gate of the driving thin film transistor,
a gate of the third driving control transistor is connected with the gate line, a first electrode of the third driving control transistor is connected with a first terminal of the first capacitor, and a second electrode of the third driving control transistor is connected with the first electrode of the driving thin film transistor,
during a data writing stage, the third driving control transistor is turned on so as to connect the first terminal of the first capacitor to the first electrode of the driving thin film transistor and connect the gate of the driving thin film transistor to the second electrode of the driving thin film transistor, such that the driving thin film transistor is turned on.

Dependencies are inferred from the claim text.

Facts

Application: 14/344,491Filed 18 Jun 2013
Priority: CN 2013 1 015339127 Apr 2013
Published: US 2015/0221251 A16 Aug 2015
Granted: 12 Apr 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

G09G 3/3233
Using an active matrix: with pixel circuitry controlling the current through the light-emitting element
G09G 3/3208
Semiconductive, e.g. using light-emitting diodes [LED]: organic, e.g. using organic light-emitting diodes [OLED]
G09G 2300/0819
Several active elements per pixel in active matrix panels: used for counteracting undesired variations, e.g. feedback or autozeroing
G09G 2300/0852
Forming a memory circuit, e.g. a dynamic memory with one capacitor: being a dynamic memory with more than one capacitor