Display device and method of driving the same in two modes

Patent metadata

Field	Value
Publication number	US-2016283033-A1
Application number	US-201615179315-A
Country	US
Kind code	A1
Filing date	Jun 10, 2016
Priority date	Sep 14, 2012
Publication date	Sep 29, 2016
Grant date	—

Abstract

A display device includes a display panel and a touch panel. The touch panel calculates coordinate information of an input position by an electrostatic capacitive method in a first mode and calculates the coordinate information of the input position by an electromagnetic induction method in a second mode. The touch panel includes scan line groups and source line groups, which are operated as touch electrodes or touch coils on the basis of the operating mode thereof. In addition, the touch panel includes touch electrodes and touch coils, which are individually operated on the basis of the operating mode thereof.

First claim

What is claimed is:

1 . A display device, comprising:
a display panel comprising a first display substrate and a second display substrate facing the first display substrate; scan line groups, each scan line group comprising a first scan line sub-group, a second scan line sub-group connected to the first scan line sub-group, and a third scan line sub-group disposed between the first scan line sub-group and the second scan line sub-group; source line groups, each source line group comprising a first source line sub-group, a second source line sub-group connected to the first source line sub-group, and a third source line sub-group disposed between the first source line sub-group and the second source line sub-group; a first driver configured to provide first scan signals to the scan line groups in a first mode and to provide second scan signals to the scan line groups in a second mode, a magnetic field being induced by a current path formed by the first scan line sub-group and the second scan line sub-group; a second driver configured to provide first sensing signals corresponding to a variation in a capacitance from the source line groups in the first mode, and to provide second sensing signals according to a resonant frequency associated with an input device, the second sensing signals being provided from the source line groups in the second mode; and a touch sensor configured to receive the first sensing signals and the second sensing signals and to determine coordinate information of an input position based on the first sensing signals and the second sensing signals.

2 . The display device of claim 1 , wherein the scan line groups and the source line groups are disposed on the first display substrate or the second display substrate.

3 . The display device of claim 2 , wherein the scan line groups and the source line groups are disposed on different layers from each other, and the scan line groups cross the source line groups.

4 . The display device of claim 2 , wherein the first display substrate comprises:
a first base substrate; a black matrix disposed on the first base substrate and comprising a plurality of openings; and a plurality of color filters disposed in the openings, respectively, and the scan line groups and the source line groups are disposed to overlap with the black matrix.

5 . The display device of claim 4 , wherein the scan line groups are disposed on one of an upper side and a lower side of the first base substrate, and the source line groups are disposed on the other one of the upper side and the lower side of the first base substrate.

6 . The display device of claim 4 , wherein the scan line groups and the source line groups are disposed on one of an upper side and a lower side of the first base substrate, and
wherein an insulating layer is disposed between the first base substrate and the scan line groups and between the first base substrate and the source line groups.

7 . The display device of claim 4 , wherein the second display substrate comprises:
a second base substrate comprising a plurality of pixel areas respectively overlapped with the openings; a plurality of signal lines disposed on the second base substrate; and a plurality of pixels respectively disposed in the pixel areas, each pixel being connected to a corresponding signal line of the signal lines.

8 . The display device of claim 7 , further comprising a liquid crystal layer disposed between the first display substrate and the second display substrate.

9 . The display device of claim 8 , wherein each of the pixels comprises:
a common electrode configured to receive a common voltage; and a pixel electrode configured to receive a pixel voltage from the corresponding signal line of the signal lines to form a horizontal electric field between the pixel electrode and the common electrode.

10 . The display device of claim 4 , wherein each of the first scan line sub-group, the second scan line sub-group, and the third scan line sub-group comprises a plurality of scan lines arranged in a first direction to be spaced apart from each other, and each of the first source line sub-group, the second source line sub-group, and the third source line sub-group comprises a plurality of source lines arranged in a second direction crossing the first direction to be spaced apart from each other.

11 . The display device of claim 10 , wherein the first display substrate further comprises a first connection line connecting an end of the first scan line sub-group and an end of the second scan line sub-group and a second connection line connecting an end of the first source line sub-group and an end of the second source line sub-group.

12 . The display device of claim 10 , wherein each of the scan lines further comprises first sensing electrodes respectively disposed at crossing points at which each scan line crosses the source lines, and each of the source lines further comprises second sensing electrodes respectively disposed at the crossing points.

13 . The display device of claim 4 , wherein the first driver comprises:
a scan signal output part configured to provide the first scan signals and the second scan signals; a selection part configured to provide switching control signals with different turn-on periods; and switching parts, each switching part configured to receive a corresponding first scan signal of the first scan signals, a corresponding second scan signal of the second scan signals, and a corresponding switching control signal of the switching control signals, and to provide one of the corresponding first scan signal and the corresponding second scan signal to a corresponding scan line group of the scan line groups in response to the corresponding switching control signal.

14 . The display device of claim 13 , wherein each of the switching parts comprises:
a first switch configured to provide the corresponding first scan signal or the corresponding second scan signal to the first scan line sub-group of the corresponding scan line group in response to the corresponding switching control signal; a second switch configured to provide the corresponding first scan signal to the second scan line sub-group of the corresponding scan line group or to ground the second scan line sub-group of the corresponding scan line group; and a third switch configured to provide the corresponding first scan signal to the third scan line sub-group of the corresponding scan line group or to float the third scan line sub-group of the corresponding scan line group.

15 . The display device of claim 14 , wherein each of the first switch and the second switch is a Complementary Metal-Oxide Semiconductor (CMOS) transistor comprising an n-type transistor or a p-type transistor, and the third switch comprises an n-channel MOS (NMOS) transistor or a p-channel MOS (PMOS) transistor.

16 . The display device of claim 4 , wherein the second driver comprises sensing signal output parts, each sensing signal output part being connected to a corresponding source line group of the source line groups, and being configured to provide a corresponding first sensing signal of the first sensing signals in the first mode, and to provide a corresponding second sensing signal of the second sensing signals.

17 . The display device of claim 16 , wherein each sensing signal output part comprises:
a first switch configured to provide the corresponding first sensing signal from one of the first source line sub-group and the second source line sub-group of the corresponding source line group or to p

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Kangwon
• Kim Incheol
• Choi Ung
• Hong Won-Ki
• Nam Seungho
• Park Jihong
• Kim Chul
• Byun Hojin
• Cha Kiseok

Classifications

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F2203/04106

  Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/0445

  using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer · CPC title