Display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-2019304397-A1
Application number	US-201916287499-A
Country	US
Kind code	A1
Filing date	Feb 27, 2019
Priority date	Apr 2, 2018
Publication date	Oct 3, 2019
Grant date	—

Abstract

A display device includes a timing controller configured to supply a first set signal to a data control signal line in a first frequency mode, and to supply a second set signal and a data signal to the data control signal line in a second frequency mode that is different from the first frequency mode, a data driver configured to recover the data signal supplied to the data control signal line according to a signal recovery characteristic value, to generate a plurality of data voltages based on the recovered data signal, and to adjust the signal recover characteristic value based on the first set signal and the second set signal, and a display unit including a plurality of pixels that emit lights with gray scales corresponding to the plurality of data voltages

First claim

What is claimed is:

1 . A display device comprising:
a timing controller configured to supply a first set signal to a data control signal line in a first frequency mode, and to supply a second set signal and a data signal to the data control signal line in a second frequency mode that is different from the first frequency mode; a data driver configured to recover the data signal supplied to the data control signal line according to a signal recovery characteristic value, to generate a plurality of data voltages based on the recovered data signal, and to adjust the signal recover characteristic value based on the first set signal and the second set signal; and a display unit comprising a plurality of pixels that emit lights with gray scales corresponding to the plurality of data voltages.

2 . The display device of claim 1 , wherein a first operating frequency in the first frequency mode is lower than a second operating frequency in the second frequency mode.

3 . The display device of claim 1 , wherein the timing controller is configured to the data signal having a high or low level to the data control signal line while a frequency mode is being changed.

4 . The display device of claim 1 , wherein the timing controller is configured to transmit a training notification signal to the data driver before the first and second set signals are transmitted to the data control signal line.

5 . The display device of claim 4 , wherein the timing controller does not transmit the training notification signal to the data driver while a frequency mode is being changed.

6 . The display device of claim 1 , wherein the data driver is configured to indicate to the timing controller whether Phase Loop Lock (PLL) has failed using a feedback signal.

7 . The display device of claim 6 , wherein the timing controller is configured to change a frequency mode from the second frequency mode to the first frequency mode when the feedback signal is received.

8 . The display device of claim 6 , wherein the timing controller is configured to continue to operate in the second frequency mode when the feedback signal is received, and to change the frequency mode from the second frequency mode to the first frequency mode when the feedback signal is again received.

9 . The display device of claim 1 , wherein the data driver comprises a plurality of driver circuits configured to supply the plurality of data voltages to the plurality of pixels, and
wherein each of the plurality of driver circuits comprises a signal recovery unit configured to recover a signal supplied to the data control signal line.

10 . The display device of claim 9 , wherein the signal recovery characteristic value represents at least one of DC and AC gains of the signal recovery unit.

11 . The display device of claim 10 , wherein the signal recovery unit is configured to recover data control signals supplied to the data control signal line by filtering the data control signals according to the signal recovery characteristic value.

12 . A method for driving a display device, the method comprising:
supplying, by a timing controller, a first set signal to a data control signal line in a first frequency mode; adjusting, by a data driver, a signal recovery characteristic value based on the first set signal; changing, by the timing controller, a frequency mode from the first frequency mode to a second frequency mode that is different from the first frequency mode; supplying, by the timing controller, a second set signal and a data signal to the data control signal line in the second frequency mode; again adjusting the signal recovery characteristic value based on the second set signal; recovering, by the data driver, the data signal according to the signal recovery characteristic value; generating, by the data driver, a plurality of data voltages based on the recovered data signal; and emitting, from a plurality of pixels, lights with gray scales corresponding to the plurality of data voltages.

13 . The method of claim 12 , wherein a first operating frequency in the first frequency mode is lower than a second operating frequency in the second frequency mode.

14 . The method of claim 12 , further comprising supplying, with the timing controller, a data signal having a high or low level to the data control signal line while a frequency mode is being changed.

15 . The method of claim 12 , further comprising transmitting, with the timing controller, a training notification signal to the data driver before the first and second set signals are transmitted to the data control signal line.

16 . The method of claim 15 , wherein the timing controller does not transmit the training notification signal to the data driver while the frequency mode is being changed.

17 . The method of claim 12 , further comprising indicating with a feedback signal, from the data driver to the timing controller, whether Phase Loop Lock (PLL) has failed.

18 . The method of claim 17 , further comprising changing, by the timing controller, the frequency mode from the second frequency mode to the first frequency mode when the feedback signal is received.

19 . The method of claim 17 , further comprising having the timing controller operate in the second frequency mode when the feedback signal is received, and change the frequency mode from the second frequency mode to the first frequency mode when the feedback signal is again received.

20 . A display device comprising:
a timing controller configured to transmit a training notification signal having a first set pattern to a data control signal line in a first frequency mode, and to supply the training notification signal having a second set pattern and a data signal to the data control signal line in a second frequency mode that is different from the first frequency mode; a data driver configured to recover the data signal supplied to the data control signal line according to a signal recovery characteristic value, to generate a plurality of data voltages based on the recovered data signal, and to adjust the signal recovery characteristic value based on the first set pattern and the second set pattern; and a display unit comprising a plurality of pixels configured to emit lights with gray scales corresponding to the plurality of data voltages.

Assignees

• Samsung Display Co Ltd

Inventors

• Im Tae Gon
• Kim Myeong Su
• Kim Bo Yeon
• Kang Sun Koo
• Kim Yong Bum
• Park Dong Won
• Cho Jung Hwan

Classifications

• G09G2340/0435

  Change or adaptation of the frame rate of the video stream · CPC title

• G09G3/3275 Primary

  Details of drivers for data electrodes · CPC title

• G09G5/008 Primary

  Clock recovery · CPC title

• G09G3/3685

  Details of drivers for data electrodes · CPC title

• G09G2330/06

  Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation · CPC title