Error detecting apparatus for gate driver, display apparatus having the same and method of detecting error of gate driver

Patent metadata

Field	Value
Publication number	US-9672087-B2
Application number	US-201414332256-A
Country	US
Kind code	B2
Filing date	Jul 15, 2014
Priority date	Jul 16, 2013
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

Exemplary embodiments of present invention relate to an error detecting apparatus for a gate driver improving a reliability of a display apparatus, a display apparatus having the error detecting apparatus, and a method of detecting an error of the gate driver using the error detecting apparatus. An exemplary embodiment discloses an error detecting apparatus including an error detecting part configured to receive a gate signal of a gate driver and determine whether a status of the gate driver is in a normal status or an error status based on the gate signal, a memory configured to store the status of the gate driver, and a signal outputting part configured to selectively output a clock signal and an error signal based on the status of the gate driver stored in the memory.

First claim

What is claimed is:

1. An error detecting apparatus comprising:
an error detecting part configured to receive a gate signal of a gate driver and determine whether a status of the gate driver is in a normal status or an error status based on the gate signal;
a memory configured to store the status of the gate driver determined by the error detecting part; and
a signal outputting part configured to selectively transmit one of a clock signal and an error signal to the gate driver, based on the status of the gate driver stored in the memory.

2. The error detecting apparatus of claim 1 , wherein the error detecting part is configured to determine the status of the gate driver when the error detecting apparatus is connected to the gate driver.

3. The error detecting apparatus of claim 1 , wherein the error detecting part is configured to determine the gate signal of the gate driver as a normal signal when, in a single frame, the gate signal of the gate driver has a single pulse that exceeds a threshold voltage.

4. The error detecting apparatus of claim 3 , wherein the error detecting part is configured to determine the status of the gate driver as the error status when a number of the normal signals in a number of frames is less than a threshold normal value.

5. The error detecting apparatus of claim 1 , wherein the error detecting part is configured to receive a gate signal of a dummy stage of the gate driver to determine the status of the gate driver, the dummy stage being connected to non-displaying pixel of a display panel.

6. A display apparatus comprising:
a display panel comprising a gate line, a data line, and a pixel;
a data driver configured to apply a data voltage to the data line;
a gate driver configured to apply a gate signal to the gate line; and
an error detecting apparatus comprising:
an error detecting part configured to receive the gate signal and determine whether a status of the gate driver is a normal status or an error status based on the gate signal;
a memory configured to store the status of the gate driver determined by the error detecting part; and
a signal outputting part configured to selectively transmit one of a clock signal and an error signal to the gate driver, based on the status of the gate driver stored in the memory.

7. The display apparatus of claim 6 , wherein the error detecting part is configured to determine the status of the gate driver when the error detecting apparatus is connected to the gate driver.

8. The display apparatus of claim 6 , wherein the error detecting part is configured to determine the gate signal of the gate driver as a normal signal when, in a single frame, the gate signal of the gate driver has a single pulse that exceeds a threshold voltage.

9. The display apparatus of claim 8 , wherein the error detecting part is configured to determine the status of the gate driver as the error status when a number of the normal signals in a number of frames is less than a threshold normal value.

10. The display apparatus of claim 6 , wherein the error detecting part is configured to receive a gate signal of a dummy stage of the gate driver to determine the status of the gate driver, the dummy stage being connected to non-displaying pixels of the display panel.

11. The display apparatus of claim 6 , wherein the gate driver is integrated on the display panel.

12. The display apparatus of claim 6 , wherein the gate driver comprises a first gate driving module disposed at a first side of the display panel and a second gate driving module disposed at a second side of the display panel opposite to the first side of the display panel, and
the error detecting part is configured to receive a gate signal of a dummy stage of the first gate driving module and a gate signal of a dummy stage of the second gate driving module to determine the status of the gate driver, both dummy stages of the first and second gate driving module being connected to non-displaying pixels of the display panel.

13. The display apparatus of claim 12 , wherein the error detecting part is configured to determine the status of the gate driver as the error status when at least one of the first gate driving module and the second gate driving module has the error status.

14. The display apparatus of claim 6 , wherein the gate driver comprises a plurality of gate channels connected to different gate line groups, and
the error detecting part is configured to receive a gate signal of a dummy stage of each gate channel to determine the status of the gate driver, the dummy stages being connected to non-displaying pixels of the display panel.

15. The display apparatus of claim 14 , wherein the error detecting part is configured to determine the status of the gate driver as the error status when at least one of the channels has the error status.

16. The display apparatus of claim 6 , further comprising a timing controller configured to output a first control signal to the gate driver and a second control signal and a data signal to the data driver.

17. The display apparatus of claim 16 , wherein the signal outputting part is configured to output the error signal to the timing controller, and
the timing controller is configured to selectively output the data signal and an error data signal to the data driver based on the error signal.

18. The display apparatus of claim 16 , wherein the timing controller is configured to directly determine the status of the gate driver from the memory and selectively output the data signal and an error data signal to the data driver based on the status of the gate driver.

19. A method of detecting an error of a gate driver, the method comprising:
determining whether a status of the gate driver is a normal status or an error status based on a gate signal of the gate driver;
storing the status of the gate driver at a memory; and
selectively transmitting one of a clock signal and an error signal to the gate driver, based on the status of the gate driver stored in the memory.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Jong-Jae
• Hwang Eui-Dong
• Koo Bon-Sung
• Kim Jun-Dal
• Moon Seung-Hwan
• Park Dong-Won

Classifications

• G09G2310/0267

  Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays · CPC title

• G09G3/3674

  Details of drivers for scan electrodes · 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

• G06F11/0751 Primary

  Error or fault detection not based on redundancy (power supply failures G06F1/30; network fault management H04L41/06) · CPC title

• G06F11/0706

  the processing taking place on a specific hardware platform or in a specific software environment · CPC title