Gate driver for providing variable gate-off voltage and display device including the same

Patent metadata

Field	Value
Publication number	US-2016189654-A1
Application number	US-201514715792-A
Country	US
Kind code	A1
Filing date	May 19, 2015
Priority date	Dec 24, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

A display panel includes: a display panel including a plurality of gate lines, a plurality of data lines, and a plurality of pixels; a gate driver connected to the plurality of gate lines to apply a gate signal voltage; a data driver connected to the plurality of data lines to apply a data voltage and a negative data voltage; and a gate voltage divider for generating a gate signal voltage including gate-on and gate-off voltages to provided it to the gate driver. The gate voltage divider adjusts the gate-off voltage in accordance with a driving time of the display panel and a temperature of the display panel.

First claim

What is claimed is:

1 . A display device comprising:
a display panel including a plurality of gate lines, a plurality of data lines, and a plurality of pixels; a gate driver connected to the plurality of gate lines to apply a gate signal voltage; a data driver connected to the plurality of data lines to apply a data voltage and a negative data voltage; and a gate voltage divider generating the gate signal voltage including a gate-on voltage and a gate-off voltage to provided it to the gate driver, wherein the gate voltage divider adjusts the gate-off voltage in accordance with a driving time of the display panel and a temperature of the display panel.

2 . The display device of claim 1 , wherein the gate voltage divider includes:
a driving time-reflecting unit providing a voltage to be adjusted according to the driving time of the display panel; a temperature-reflecting unit providing a voltage to be adjusted according to the temperature of the display panel; and a voltage adjuster outputting a voltage calculated by subtracting the voltages provided by the driving time-reflecting unit and the temperature-reflecting unit from a reference gate-off voltage.

3 . The display device of claim 2 , wherein the driving time-reflecting unit includes:
a monitoring oscillator (OSC) monitoring the driving time of the display panel; a programmable setting outputting a preset voltage in response to the driving time provided by the monitoring OSC; and a driving time-reflecting voltage provider providing an analog voltage corresponding to the voltage provided by the programmable setting to the voltage adjuster.

4 . The display device of claim 2 , wherein the temperature-reflecting unit includes a first resistor and a second resistor, and a variable resistor that is connected to the first resistor in series and to the second resistor in parallel.

5 . The display device of claim 4 , wherein the variable resistor is a negative temperature coefficient (NTC) resistor.

6 . The display device of claim 2 , wherein the driving time-reflecting unit determines the voltage to be adjusted by reflecting both performance deterioration of the thin film transistor according to elapse of the driving time of the display panel and performance restoration of the thin film transistor according to elapse of an operation stoppage time of the display panel.

7 . The display device of claim 6 , wherein the driving time-reflecting unit includes:
a monitoring OSC monitoring the driving time of the display panel and an operation stoppage time; a programmable setting outputting a preset voltage in response to the driving time and the operation stoppage time provided by the monitoring OSC; and a driving time-reflecting voltage provider providing an analog voltage corresponding to the voltage provided by the programmable setting to the voltage adjuster.

8 . A gate driving device comprising:
a gate driver outputting a gate signal voltage including gate-on and gate-off voltages driving thin film transistors formed in a display panel; and a gate voltage divider generating the gate signal voltage to provide it to the gate driver, wherein the gate voltage divider adjusts the gate-off voltage in accordance with a driving time of the display panel and a temperature of the display panel.

9 . The gate driving device of claim 8 , wherein the gate voltage divider includes:
a driving time-reflecting unit providing a voltage to be adjusted according to the driving time of the display panel; a temperature-reflecting unit providing a voltage to be adjusted according to the temperature of the display panel; and a voltage adjuster outputting a voltage calculated by subtracting the voltages provided by the driving time-reflecting unit and the temperature-reflecting unit from a reference gate-off voltage.

10 . The gate driving device of claim 9 , wherein the driving time-reflecting unit includes:
a monitoring OSC monitoring the driving time of the display panel; a programmable setting outputting a preset voltage in response to the driving time provided by the monitoring OSC; and a driving time-reflecting voltage provider providing an analog voltage corresponding to the voltage provided by the programmable setting to the voltage adjuster.

11 . The gate driving device of claim 9 , wherein the temperature-reflecting unit includes a first resistor and a second resistor, and a variable resistor that is connected to the first resistor in series and to the second resistor in parallel.

12 . The gate driving device of claim 11 , wherein the variable resistor is an NTC resistor.

13 . The gate driving device of claim 9 , wherein the driving time-reflecting unit determines the voltage to be adjusted by reflecting both performance deterioration of the thin film transistor according to elapse of the driving time of the display panel and performance restoration of the thin film transistor according to elapse of an operation stoppage time of the display panel.

14 . The gate driving device of claim 13 , wherein the driving time-reflecting unit includes:
a monitoring OSC monitoring the driving time of the display panel and the operation stoppage time; a programmable setting outputting a preset voltage in response to the driving time and the operation stoppage time provided by the monitoring OSC; and a driving time-reflecting voltage provider providing an analog voltage corresponding to the voltage provided by the programmable setting to the voltage adjuster.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Yoon Ho
• Kim Beom Jun
• Choi Geun Hyuk
• Takeuchi Noboru
• Lee Yong Soon
• Lee Jong Hwan
• Lee Hong-Woo
• Hwang Yong-Sik

Classifications

• G09G3/3607

  for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127) · CPC title

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title

• G09G2320/041

  Temperature compensation · CPC title

• G09G2310/08

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

• G09G3/3685 Primary

  Details of drivers for data electrodes · CPC title