DISPLAY DEVICE WITH INTEGRATED TOUCH SCREEN

• US 20150378499A1
• Filed: 12/29/2014
• Published: 12/31/2015
• Est. Priority Date: 06/30/2014
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Choi, Yoon Jong, Kwon, Keuk Sang, Park, Seung Chul, Cho, Nam Kyun
• Granted Patent: US 10,871,849 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 1/3262 Power saving in digitizer or tablet
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

A display device with integrated touch screen is provided. The display device includes a panel configured to include a plurality of electrodes and to be division-driven in a display driving mode and a touch driving mode during one frame period, a display driver IC configured to apply a common voltage to the plurality of electrodes during the display driving mode, and an ROIC configured to apply, to the plurality of electrodes, a touch scan signal for sensing a touch when the touch driving mode is a first touch driving mode, and apply, to the plurality of electrodes, a touch scan signal for detecting a touch input position when the touch driving mode is a second touch driving mode.

Claims

1. A display device with integrated touch screen, the display device comprising:

a panel configured to include a plurality of electrodes, wherein the panel is division-driven in a display driving mode and a touch driving mode during one frame period;

a display driver IC configured to apply a common voltage to the plurality of electrodes during the display driving mode; and

an ROIC configured to apply, to the plurality of electrodes, a touch scan signal for sensing a touch when the touch driving mode is a first touch driving mode, and apply, to the plurality of electrodes, a touch scan signal for detecting a touch input position when the touch driving mode is a second touch driving mode,

wherein number of times the touch scan signal is applied to the plurality of electrodes during one frame period when the touch driving mode is the first touch driving mode is smaller than number of times the touch scan signal is applied to the plurality of electrodes during one frame period when the touch driving mode is the second touch driving mode.

2. The display device of claim 1, wherein the first touch driving mode is an idle driving mode, and the second touch driving mode is an active driving mode.

3. The display device of claim 1, wherein, when the touch driving mode is the first touch driving mode, the touch scan signal is applied to the plurality of electrodes once during one frame period.

4. The display device of claim 1, wherein, when the touch driving mode is the second touch driving mode, the touch scan signal is applied to the plurality of electrodes twice or more during one frame period.

5. The display device of claim 1, wherein, when the touch driving mode is the first touch driving mode, the ROIC is turned on during a period where the touch scan signal is applied to the plurality of electrodes in the one frame period.

6. The display device of claim 1, wherein, when the touch driving mode is the second touch driving mode, the ROIC is turned off during the display driving mode in the one frame period.

7. The display device of claim 1, wherein the display driving mode and the second touch driving mode are alternately division-driven during the one frame period.

8. The display device of claim 1, wherein the ROIC receives, from the plurality of electrodes, a feedback signal based on the touch scan signal for sensing the touch and a feedback signal based on the touch scan signal for detecting the touch input position, and determines whether the panel is touched or detects the touch input position.