Organic light-emitting oled data compensation circuits and methods and the oled display devices thereof

Patent metadata

Field	Value
Publication number	US-2018204514-A1
Application number	US-201615038467-A
Country	US
Kind code	A1
Filing date	Mar 16, 2016
Priority date	Feb 25, 2016
Publication date	Jul 19, 2018
Grant date	—

Abstract

An OLED data compensation circuit and method, and an OLED display device are disclosed. The OLED data compensation circuit includes: a sensing circuit for detecting a drifting amount of a threshold voltage of thin film transistors (TFTs); a timing controller connected with the sensing circuit for receiving the drifting amount, and outputting voltage control signals and source driving signals, which controlling a voltage of data signals outputted by a source driver; a reference voltage output circuit connected with the timing controller, is configured for outputting a first reference voltage in accordance with the voltage control signals, the voltage of the data signals and the first reference voltage are configured for compensating the drifting amount of the threshold voltage of the driving TFTs to compensate data of the OLED. In this way, the OLED data compensation is not limited only by the source driver, the OLED data compensation may be enhanced.

First claim

What is claimed is:

1 . An organic light-emitting diode (OLED) data compensation circuit, comprising:
a sensing circuit is configured for detecting a drifting amount of a threshold voltage of thin film transistors (TFTs), wherein the TFTs are configured for driving the OLED; a timing controller connects with the sensing circuit for receiving the drifting amount, and is configured for outputting voltage control signals and source driving signals, and the source driving signals are configured for controlling a voltage of data signals outputted by a source driver; a reference voltage output circuit connected with the timing controller, the reference voltage output circuit is configured for outputting a first reference voltage in accordance with the voltage control signals, the voltage of the data signals outputted by the source driver and the first reference voltage are configured for compensating the drifting amount of the threshold voltage of the driving TFTs to compensate data of the OLED.

2 . The OLED data compensation circuit as claimed in claim 1 , wherein the timing controller further outputs the gate driving signals controlling a gate driver to output scanning signals such that the data signals are transmitted to the driving TFTs.

3 . The OLED data compensation circuit as claimed in claim 1 , wherein the reference voltage output circuit is configured for outputting a second reference voltage to be transmitted to a drain of the driving TFTs.

4 . The OLED data compensation circuit as claimed in claim 1 , wherein the timing controller is configured for:
calculating the compensation voltage in accordance with the drifting amount; and outputting the voltage control signals and the source driving signals in accordance with the compensation voltage.

5 . The OLED data compensation circuit as claimed in claim 4 , wherein the timing controller is configured for:
determining whether the compensation voltage is not within the voltage range of the data signals outputted by the source driver; if the compensation voltage is not within the voltage range, the source driving signals are adjusted to control the voltage of the data signals outputted by the source driver; and if the compensation voltage is within the voltage range, the voltage control signals are adjusted such that the reference voltage output circuit is controlled to adjust the outputted first reference voltage.

6 . An OLED data compensation method, comprising:
detecting a drifting amount of a threshold voltage of at least one driving TFT, wherein the driving TFT is configured for driving the OLED; outputting voltage control signals and source driving signals in accordance with the drifting amount, wherein the source driving signals are configured for controlling a voltage of the data signals outputted from a source driver; and outputting a first reference voltage in accordance with voltage control signals, wherein the voltage of the data signals and the first reference voltage outputted from the source driver are configured for compensating the drifting amount of the threshold voltage of the driving TFTs to compensate OLED data.

7 . The method as claimed in claim 6 , wherein the step of outputting a first reference voltage in accordance with voltage control signals further comprises:
outputting a second reference voltage to be transmitted to a drain of the driving TFT.

8 . The method as claimed in claim 6 , wherein the step of outputting voltage control signals and source driving signals in accordance with the drifting amount further comprises:
calculating the compensation voltage in accordance with the drifting amount; and outputting the voltage control signals and the source driving signals in accordance with the compensation voltage.

9 . The method as claimed in claim 8 , wherein the step of outputting voltage control signals and source driving signals in accordance with the drifting amount further comprises:
determining whether the compensation voltage is not within the voltage range of the data signals outputted by the source driver; if the compensation voltage is not within the voltage range, the source driving signals are adjusted to control the voltage of the data signals outputted by the source driver; and if the compensation voltage is within the voltage range, the voltage control signals are adjusted such that the reference voltage output circuit is controlled to adjust the outputted first reference voltage.

10 . An OLED display device, comprising:
an OLED display panel comprising a plurality of OLEDs arranged in a matrix; a source driver is configured for outputting data signals and transmitting the data signals to at least one driving TFT; wherein the source driver comprises an OLED data compensation circuit for compensating a drifting amount of a threshold voltage of the driving TFT to compensate OLED data; the OLED data compensation circuit comprises: a sensing circuit is configured for detecting the drifting amount of the threshold voltage of TFTs, wherein the TFTs are configured for driving the OLED; a timing controller connects with the sensing circuit for receiving the drifting amount, and is configured for outputting voltage control signals and source driving signals, and the source driving signals are configured for controlling a voltage of data signals outputted by a source driver; and a reference voltage output circuit connected with the timing controller, the reference voltage output circuit is configured for outputting a first reference voltage in accordance with the voltage control signals, the voltage of the data signals outputted by the source driver and the first reference voltage are configured for compensating the drifting amount of the threshold voltage of the driving TFTs to compensate data of the OLED.

11 . The OLED display device as claimed in claim 10 , wherein the timing controller further outputs the gate driving signals controlling a gate driver to output scanning signals such that the data signals are transmitted to the driving TFTs.

12 . The OLED display device as claimed in claim 10 , wherein the reference voltage output circuit is configured for outputting a second reference voltage to be transmitted to a drain of the driving TFTs.

13 . The OLED display device as claimed in claim 10 , wherein the timing controller is configured for:
calculating the compensation voltage in accordance with the drifting amount; and outputting the voltage control signals and the source driving signals in accordance with the compensation voltage.

14 . The OLED display device as claimed in claim 13 , wherein the timing controller is configured for:
determining whether the compensation voltage is not within the voltage range of the data signals outputted by the source driver; if the compensation voltage is not within the voltage range, the source driving signals are adjusted to control the voltage of the data signals outputted by the source driver; and if the compensation voltage is within the voltage range, the voltage control signals are adjusted such that the reference voltage output circuit is controlled to adjust the outputted first reference voltage.

Assignees

• Shenzhen China Star Optoelect

Inventors

• Xu Jing
• Hwang Tai-Jiun

Classifications

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• H01L27/3262

  Electricity · mapped topic

• G09G3/3258 Primary

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

• G09G2320/0204

  Compensation of DC component across the pixels in flat panels · CPC title

• G09G2310/0264

  Details of driving circuits · CPC title