System and method for controlling charge pump circuit, and display device

Patent metadata

Field	Value
Publication number	US-9343952-B2
Application number	US-201414492589-A
Country	US
Kind code	B2
Filing date	Sep 22, 2014
Priority date	May 14, 2014
Publication date	May 17, 2016
Grant date	May 17, 2016

Abstract

The present disclosure provides a system and a method for controlling a charge pump circuit, and a display device. The system includes the charge pump circuit configured to output a driving voltage to a gate driver circuit; and a controlling device in communication with the charge pump circuit and a timer and configured to, when a working time of the gate driver circuit is equal to a predefined working time threshold, reset the working time of the gate driver circuit to an initial value, acquire a compensating voltage corresponding to the working time of the gate driver circuit in accordance with a correspondence between the working time and the compensating voltage, output a compensating voltage signal and increase the driving voltage outputted by the charge pump circuit by the compensating voltage.

First claim

What is claimed is:

1. A system for controlling a charge pump circuit, comprising:
the charge pump circuit configured to output a driving voltage to a gate driver circuit; and
a controlling device in communication with the charge pump circuit and configured to, when a working time of the gate driver circuit is equal to a predefined working time threshold, reset the working time of the gate driver circuit to an initial value, acquire a compensating voltage corresponding to the working time of the gate driver circuit in accordance with a correspondence between the working time of the gate driver circuit and the compensating voltage, output a compensating voltage signal and increase the driving voltage outputted by the charge pump circuit by the compensating voltage,
wherein the controlling device comprises a charge pump interface circuit configured to output a signal to the charge pump circuit, the controlling device configured to:
determine a reference compensating voltage in accordance with the compensating voltage and a duty ratio of an output signal of the charge pump interface circuit,
output a reference compensating voltage signal to the charge pump interface circuit, and after the charge pump circuit receives the compensating voltage signal, increase the driving voltage outputted by the charge pump circuit by the compensating voltage.

2. The system according to claim 1 , wherein the correspondence between the working time of the gate driver circuit and the compensating voltage is a constant function.

3. The system according to claim 2 , wherein the compensating voltage is in a range of 0.1V to 0.5V.

4. The system according to claim 2 , wherein the working time threshold is 1000 hours.

5. The system according to claim 2 , further comprising a timer in communication with the controlling device and configured to record the working time of the gate driver circuit.

6. The system according to claim 1 , wherein the correspondence between the working time of the gate driver circuit and the compensating voltage is determined in accordance with the relationship between current-voltage of a TFT and time.

7. The system according to claim 1 , wherein the correspondence between the working time of the gate driver circuit and the compensating voltage is a function.

8. The system according to claim 1 , further comprising a timer in communication with the controlling device and configured to record the working time of the gate driver circuit.

9. The system according to claim 8 , wherein the timer is a counter with a counting frequency identical to a clock frequency of a scanning signal of the gate driver circuit.

10. The system according to claim 1 , wherein the charge pump circuit receives a source voltage outputted by a power supply integrated circuit of a display device and the compensating voltage signal outputted by the controlling device, and outputs the driving voltage to which the compensating voltage has been added.

11. The system according to claim 1 , wherein the gate driver circuit comprises a shift register, to which the driving voltage is outputted by the charge pump circuit.

12. The system according to claim 1 , further comprising a memory in communication with the controlling device and configured to store a value of the driving voltage outputted by the charge pump circuit.

13. A display device, comprising the system for controlling the charge pump circuit according to claim 1 .

14. A method for controlling a charge pump circuit, comprising:
determining whether or not a working time of a gate driver circuit is equal to a predefined working time threshold;
when the working time of the gate driver circuit is equal to the predefined working time threshold, resetting the working time of the gate driver circuit to an initial value, acquiring a compensating voltage corresponding to the working time of the gate driver circuit in accordance with a correspondence between the working time of the gate driver circuit and the compensating voltage, outputting a compensating voltage signal, and increasing a driving voltage outputted by the charge pump circuit by the compensating voltage, and
determining a reference compensating voltage in accordance with the compensating voltage and a duty ratio of a signal outputted by a charge pump interface circuit to the charge pump circuit, outputting a reference compensating voltage signal to the charge pump interface circuit, and after receiving, by the charge pump circuit, the compensating voltage signal, increasing the driving voltage outputted by the charge pump circuit by the compensating voltage.

15. The method according to claim 14 , wherein the correspondence between the working time of the gate driver circuit and the compensating voltage is a constant function.

16. The method according to claim 15 , wherein the compensating voltage is in a range of 0.1V to 0.5V.

17. The method according to claim 14 , wherein the correspondence between the working time of the gate driver circuit and the compensating voltage is a function.

18. The method according to claim 14 , wherein the working time threshold is 1000 hours.

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Display Tech Co

Inventors

• Xi Yusheng
• Hu Haichen
• Zhang Chunbing

Classifications

• H02M3/07

  using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps} · CPC title

• G09G2320/0204

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

• G09G3/2096

  Details of the interface to the display terminal specific for a flat panel (suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167) · CPC title

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title