Display device with integrated touch screen and method for driving the same

• US 10,423,288 B2
• Filed: 12/21/2018
• Issued: 09/24/2019
• Est. Priority Date: 02/20/2012
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lee, JungHan, Kim, HongChul, Kim, SungChul, Lee, JeongSeop, Pyo, SeungEun
• Primary Examiner(s): Ahn, Sejoon
• Application Number:
  US16/230,984
• Publication Number:
  US 20190129540A1
• Time in Patent Office: 277 Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

Discussed are a display device with an integrated touch screen and a method of operating the same. The display device according to an embodiment includes a display panel including a plurality of pixel electrodes; a touch screen including m number of electrodes which are formed to overlap with the plurality of pixel electrodes, wherein m is a multiple of n, and n is an integer equal to or greater than two, and wherein the m electrodes are divided into n number of electrode groups; a touch driver configured to generate a touch scan signal and to supply the generated touch scan signal to a display driver; and the display driver configured to apply a common voltage or the touch scan signal to one or more of the m electrodes depending on a driving mode of the display device.

Claims

1. A method for a driving a self-capacitive touch sensitive display device comprising a display panel having a plurality of touch electrodes including at least a first group of touch electrodes including a first touch electrode and a second touch electrode and a second group of touch electrodes including a third touch electrode and a fourth touch electrode, a plurality of touch lines including at least a first touch line, a second touch line, a third touch line, and a fourth touch line, a plurality of pixel electrodes in a pixel area of the display panel, a plurality of data lines electrically connected to the plurality of pixel electrodes, and a display driver Integrated Circuit (IC) including a first multiplexer, a second multiplexer, and a plurality of touch channel outputs including at least a first touch channel output, a second touch channel output, a third touch channel output, and a fourth touch channel output, wherein the first touch electrode is connected to the first channel output via the first touch line, the second touch electrode is connected to the second channel output via the second touch line, the third touch electrode is connected to the third channel output via the third touch line, and the fourth touch electrode is connected to the fourth channel output via the fourth touch line, the method comprising:

providing a common voltage to the first touch electrode, the second touch electrode, the third touch electrode and the fourth touch electrode during a display period via the plurality of touch lines;

providing a touch scan signal to the first touch electrode and the second touch electrode simultaneously during a first part of a touch period;

providing the touch scan signal to the third touch electrode and the fourth touch electrode simultaneously during a second part of the touch period;

connecting selectively to the first touch channel output or the third touch channel output by the first multiplexer during the touch period; and

connecting selectively to the second touch channel output or the fourth touch channel by the second multiplexer during the touch period.

2. The method of claim 1, wherein the display driver Integrated Circuit (IC) further includes a plurality of data channel outputs, and

wherein the plurality of pixel electrodes of the display panel are respectively connected to the plurality of data channel outputs of the display driver Integrated Circuit (IC) via the plurality of data lines.