Display apparatus and method of driving display panel using the same

Patent metadata

Field	Value
Publication number	US-10339874-B2
Application number	US-201715714020-A
Country	US
Kind code	B2
Filing date	Sep 25, 2017
Priority date	Nov 30, 2016
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

Abstract

A display apparatus includes a display panel, a gate driver, a data driver and a timing controller. The display panel displays an image. The gate driver outputs a gate signal to the display panel. The data driver includes a plurality of data driving chips which outputs data voltages to the display panel based on data signals. The timing controller adjusts a waveform of the data signals based on a temperature of the data driving chips.

First claim

What is claimed is:

1. A display apparatus comprising:
a display panel which displays an image;
a gate driver which outputs a gate signal to the display panel;
a data driver comprising a plurality of data driving chips which outputs data voltages to the display panel based on data signals; and
a timing controller which adjusts a waveform of the data signals based on a temperature of the data driving chips received from a temperature sensor disposed in each of the data driving chips,
wherein the timing controller comprises:
an eye-diagram compensating part which receives a temperature signal representing the temperature of the data driving chips from the temperature sensor and determines an eye-diagram compensating value corresponding to the temperature of the data driving chips based on the temperature signal; and an image compensating part which adjusts an eye-diagram waveform of the data signals based on the eye-diagram compensating value received from a look-up-table in memory.

2. The display apparatus of claim 1 , wherein the timing controller adjusts the eye-diagram waveform of the data signals in a way such that the eye-diagram waveform of the data signals does not meet a mask representing a noise limit of the data signal.

3. The display apparatus of claim 1 , wherein the memory stores the eye-diagram compensating value corresponding to the temperature of the data driving chips, wherein the memory is disposed outside of the timing controller.

4. The display apparatus of claim 1 , wherein the timing controller increases an amplitude of the data signals based on the eye-diagram compensating value in response to the temperature signal so that a vertical width of the eye-diagram waveform is increased.

5. The display apparatus of claim 1 , wherein the image compensating part of the timing controller determines an overshooting value to change grayscale data of a present frame data signal using a previous frame data signal and the present frame data signal.

6. The display apparatus of claim 5 , wherein the timing controller increases the overshooting value of the data signals based on the eye-diagram compensating value corresponding to the temperature of the data driving chips so that an inclination of a diagonal waveform of the eye-diagram waveform is increased.

7. The display apparatus of claim 1 , wherein the timing controller further comprises a signal generating part which generates a first control signal to control a driving timing of the gate driver based on an input control signal, and a second control signal to control a driving timing of the data driver based on the input control signal.

8. The display apparatus of claim 7 , wherein the timing controller decreases a frame rate of the data signals based on the eye-diagram compensating value corresponding to the temperature of the data driving chips so that a horizontal width of the eye-diagram waveform is increased.

9. The display apparatus of claim 8 , wherein
the eye-diagram compensating part determines an eye-diagram level compensating value corresponding to the temperature of the data driving chips and an eye-diagram timing compensating value corresponding to the temperature of the data driving chips, based on the temperature signal,
the eye-diagram level compensating value determines at least one of an amplitude of the data signals and an overshooting value of the data signals,
the eye-diagram timing compensating value determines the frame rate of the data signals,
the image compensating part compensates the data signals based on input image data, the eye-diagram level compensating value and the eye-diagram timing compensating value, and
the signal generating part generates the first control signal and the second control signal based on the input control signal, the eye-diagram level compensating value and the eye-diagram timing compensating value.

10. A method of driving a display panel of a display apparatus, the method comprising:
adjusting a waveform of data signals to be outputted from data driving chips of the display apparatus based on a temperature of the data driving chips, received from a temperature sensor disposed in each of the data driving chips, using a timing controller of the display apparatus;
outputting data voltages to the display panel based on the data signals outputted from the data driving chips;
outputting gate signals to the display panel; and
displaying an image using the display panel based on the gate signals and the data voltages,
wherein the timing controller comprises:
an eye-diagram compensating part which receives a temperature signal from the temperature sensor representing the temperature of the data driving chips and determines an eye-diagram compensating value corresponding to the temperature of the data driving chips based on the temperature signal; and
an image compensating part which adjusts an eye-diagram waveform of the data signals based on the eye-diagram compensating value received from a look-up-table in memory.

11. The method of claim 10 , wherein the adjusting the waveform of the data signals comprises adjusting the eye-diagram waveform of the data signals in a way such that the eye-diagram waveform does not meet a mask representing a noise limit of the data signal.

12. The method of claim 10 , wherein the adjusting the waveform of the data signals comprises increasing an amplitude of the data signals based on the eye-diagram compensating value corresponding to the temperature of the data driving chips so that a vertical width of the eye-diagram waveform is increased.

13. The method of claim 10 , wherein the image compensating part of the timing controller determines an overshooting value to change grayscale data of present frame data signal using previous frame data signal and the present frame data signal.

14. The method of claim 13 , wherein the adjusting the waveform of the data signals comprises increasing the overshooting value of the data signals based on the eye-diagram compensating value corresponding to the temperature of the data driving chips so that an inclination of a diagonal waveform of the eye-diagram waveform is increased.

15. The method of claim 10 , wherein the timing controller further comprises a signal generating part which generates a first control signal to control a driving timing of the gate driver based on an input control signal, and a second control signal to control a driving timing of the data driver based on the input control signal.

16. The method of claim 15 , wherein the adjusting the waveform of the data signals comprises decreasing a frame rate of the data signals based on the eye-diagram compensating value corresponding to the temperature of the data driving chips so that a horizontal width of the eye-diagram waveform is increased.

17. The method of claim 16 , wherein
the eye-diagram compensating part determines an eye-diagram level compensating value and an eye-diagram timing compensating value corresponding to the temperature of the data driving chips based on the temperature signal,
the eye-diagram level compensating value determines at least one of an amplitude of the data signals and an overshooting value of the data signals,
the eye-diagram timing compensating value determines the frame rate of the data signals,
the image compensating part compensates the data signals based on input image data, the eye-diagram level compensating value and the eye-diagram timing compensating value, and
the signal generating part generates the first control signal and the second control signal based on the input control si

Assignees

• Samsung Display Co Ltd

Inventors

• Won Hyeonuk
• Lee Jang-Mi
• Seo Wonjin
• Yoon Hyun-Sik

Classifications

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G3/3258

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

• G09G2310/08

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

• G09G3/3688 Primary

  suitable for active matrices only · CPC title

• G09G2320/041

  Temperature compensation · CPC title