Devices and methods for applying data voltage signal, display panels and display devices

Patent metadata

Field	Value
Publication number	US-9922599-B2
Application number	US-201514965854-A
Country	US
Kind code	B2
Filing date	Dec 10, 2015
Priority date	Jul 9, 2015
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

A device and method for applying a data voltage signal, a display panel, and a display device. The device for applying the data voltage signal includes: a voltage signal detection module configured to detect an image signal inputted to a display assembly; and a threshold compensation signal outputting module configured to process the inputted image signal and apply the processed image signal to a gate electrode of a driving transistor so that the driving transistor is turned on before a threshold compensation for the driving transistor is conducted; where, the processed image signal is obtained by subtracting a preset voltage signal from the inputted image signal.

First claim

We claim:

1. An OLED pixel circuit, comprising:
a voltage signal detection module, a threshold compensation signal outputting module, and a driving transistor, wherein the driving transistor includes an input terminal and a control terminal,
in a pre-threshold compensation phase, the voltage signal detection module is configured to be electrically connected to the threshold compensation signal outputting module, and transmit an image signal to the threshold compensation signal outputting module,
the threshold compensation signal outputting module configured to process the image signal based on a preset voltage signal to obtain a processed image signal and transmit the processed image signal to the control terminal of the driving transistor to turn on the driving transistor,
wherein a voltage of the processed image signal is equal to a difference between a voltage of the image signal and a voltage of the preset voltage signal, and
in a threshold compensation phase, the voltage signal detection module is configured to transmit the image signal to the driving transistor through the input terminal of the driving transistor.

2. The pixel circuit of claim 1 , wherein, the OLED pixel circuit further comprises a light emitting assembly; the light emitting assembly is configured to emit light when receiving an image signal outputted from the driving transistor.

3. The pixel circuit of claim 1 , wherein a voltage of the preset voltage signal is equal to a critical voltage of the control terminal of the driving transistor.

4. The pixel circuit of claim 1 , wherein the voltage signal detection module is further configured to read the image signals from a control module by columns or rows before transmitting the image signals to the threshold compensation signal outputting module.

5. A display, comprising: an OLED pixel circuit comprising a voltage signal detection module, a threshold compensation signal outputting module, and a driving transistor, wherein the driving transistor comprises an input terminal and a control terminal,
in a pre-threshold compensation phase, the voltage signal detection module is configured to be electrically connected to the threshold compensation signal outputting module, and transmit an image signal to the threshold compensation signal outputting module,
the threshold compensation signal outputting module configured to process the image signal based on a preset voltage signal to obtain a processed image signal and transmit the processed image signal to the control terminal of the driving transistor to turn on the driving transistor,
wherein a voltage of the processed image signal is equal to a difference between a voltage of the image signal and a voltage of the preset voltage signal, and
in a threshold compensation phase, the voltage signal detection module is configured to transmit the image signal to the driving transistor through the input terminal of the driving transistor.

6. The display of claim 5 , wherein each column or each row of the OLED pixel circuits share one of the reference voltage signal lines.

7. The display of claim 5 , the display further comprising a plurality of date lines and a plurality of reference voltage signal lines, the date lines and the reference voltage signal lines are parallel to each other.

8. A method for driving an OLED pixel circuit, comprising:
in a pre-threshold compensation phase, processing an image signal based on a preset voltage signal to obtain a processed image signal and transmitting the processed image signal to a control terminal of a driving transistor to turn on the driving transistor,
wherein a voltage of the processed image signal is equal to a difference between a voltage of the image signal and a voltage of the preset voltage signal, and
in a threshold compensation phase, transmitting the image signal to the driving transistor through an input terminal of the driving transistor.

9. The method of claim 8 , wherein, the voltage of the preset voltage signal is equal to a critical voltage of the gate electrode of the driving transistor.

10. The method of claim 8 , further comprising: reading the image signals from a control module by columns or rows before transmitting the image signals to the threshold compensation signal outputting module.

Assignees

• Shanghai Tianma Am Oled Co Ltd
• Tianma Micro Electronics Co Ltd

Inventors

• Li Yue
• Zhang Tong
• Qian Dong
• Du Yi

Classifications

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G3/3258 Primary

  with pixel circuitry controlling the voltage across the light-emitting element · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G3/3291 Primary

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title