Touch sensor integrated type display device

Patent metadata

Field	Value
Publication number	US-9946382-B2
Application number	US-201514977519-A
Country	US
Kind code	B2
Filing date	Dec 21, 2015
Priority date	Dec 31, 2014
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A display device including a panel comprising a plurality of pixels, and a drive circuit configured to apply data voltage to the plurality of pixels through data lines is disclosed. In one embodiment, the drive circuit includes a first circuit block having a first recovery time from a power off state to an operational state of the first circuit block, a second circuit block having a second recovery time from a power off state to an operational state of the second circuit block, the second recovery time shorter than the first recovery time, and a control circuit configured to (i) enable the first circuit block and the second circuit block during a first time period, and to (ii) enable the first circuit block and disable the second circuit block during a second time period.

First claim

What is claimed is:

1. A display device comprising:
a panel comprising a plurality of pixels; and
a drive circuit configured to receive digital video data, convert the digital video data into data voltage, and apply the data voltage to the plurality of pixels through data lines, the drive circuit comprising:
a first circuit block having a first recovery time from a power off state to an operational state of the first circuit block,
a second circuit block having a second recovery time from a power off state to an operational state of the second circuit block, the second recovery time shorter than the first recovery time, and
a control circuit configured to (i) enable the first circuit block and the second circuit block for at least a same portion of time during a first time period, and to (ii) enable the first circuit block and disable the second circuit block during a second time period, wherein the first time period is a display period and the second time period is a touch sense period.

2. The display device of claim 1 , further comprising:
a touch drive circuit configured to sense a touch on the panel during the second time period.

3. The display device of claim 2 , wherein an output impedance of the second circuit block is higher in the touch sense period than in the display period to perform touch sensing.

4. The display device of claim 1 , wherein the control circuit is further configured to disable the first circuit block and the second circuit block during a third time period.

5. The display device of claim 1 , further comprising a first switch between the first circuit block and a first power supply voltage, and a second switch between the second circuit block and a second power supply voltage.

6. The display device of claim 5 , wherein the first switch is configured to (i) couple the first circuit block and the first power supply voltage to enable the first circuit block or (ii) decouple the first switch and the first circuit block to disable the first circuit block, and wherein the second switch is configured to (i) couple the second circuit block and the second power supply voltage to enable the second circuit block or (ii) decouple the second switch and the second circuit block to disable the second circuit block.

7. The display device of claim 1 , wherein the first circuit block includes a clock data recovery circuit to receive the digital video data.

8. The display device of claim 1 , wherein the second circuit block includes a digital to analog converter to convert the digital video data into the data voltage.

9. The display device of claim 1 , wherein the drive circuit is further configured to receive a first signal indicating whether to enable or disable the panel, and a second signal indicating whether the panel to display an image or detect a touch on the panel.

10. The display device of claim 9 , wherein the drive circuit is further configured to disable the first circuit block and the second circuit block, responsive to the first signal indicating to disable the panel.

11. The display device of claim 9 , wherein the drive circuit is further configured to enable the first circuit block and the second circuit block, responsive to the first signal indicating to enable the panel and the second signal indicating to display the image.

12. The display device of claim 9 , wherein the drive circuit is further configured to enable the first circuit block and disable the second circuit block, responsive to the first signal indicating to enable the panel and the second signal indicating to sense the touch on the panel.

13. The display device of claim 1 , further comprising an in-cell type touch screen.

14. A method of operating a display device, the method comprising:
enabling a first circuit block to receive digital video data during a first time period and a second time period, the first circuit block having a first recovery time from a power off state to an operation state of the first circuit block;
enabling a second circuit block to convert the digital video data into analog video data for at least a same portion of time during the first time period, the second circuit block having a second recovery time from a power off state to an operation state of the second circuit block, the second recovery time shorter than the first recovery time;
applying the analog video data to pixels through data lines during the first time period;
displaying an image on a panel of the display device during the first time period;
disabling the second circuit block during the second time period; and
sensing a touch on the panel during the second time period.

15. The method of claim 14 , disabling the first circuit block and the second circuit block during a third time period.

16. The method of claim 14 , further comprising:
supplying a first power supply voltage to the first circuit block to enable the first circuit block during the first time period and the second time period; and
supplying a second power supply voltage to the second circuit block to enable the second circuit block during the first time period, a voltage level of the second power supply voltage higher than a voltage level of the first power supply voltage.

17. The method of claim 16 , further comprising:
cutting off the first power supply voltage to the first circuit block to disable the first circuit block during a third time period; and
cutting off the second power supply voltage to the second circuit block to disable the second circuit block during the second time period and the third time period.

Assignees

• Lg Display Co Ltd

Inventors

• Jung Yongchae
• Seo Seungpyo

Classifications

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G06F1/3287

  by switching off individual functional units in the computer system · CPC title

• G09G2310/08

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

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F1/3265

  Power saving in display device · CPC title