Touch sensing module and display device including the same
A touch sensing module includes: first driving electrodes arranged in parallel; first sensing electrodes intersecting the first driving electrodes; second driving electrodes on a rear side of the first driving electrode with a touch insulating layer therebetween such that they are associated with the first driving electrodes, respectively; second sensing electrodes on a rear side of the first sensing electrodes with the touch insulating layer therebetween such that they are associated with the first sensing electrodes, respectively; driving switching circuits electrically connecting the second driving electrodes to the first driving electrodes, respectively, or to a low-level voltage source; and a touch driver circuit configured to supply touch driving signals to the first driving electrodes and to detect touch sensing signals through the first sensing electrodes to detect touch position coordinates.
1 . A touch sensing module comprising:
first driving electrodes arranged in parallel;
first sensing electrodes intersecting the first driving electrodes;
second driving electrodes on a rear side of the first driving electrode with a touch insulating layer therebetween such that they are associated with the first driving electrodes, respectively;
second sensing electrodes on a rear side of the first sensing electrodes with the touch insulating layer therebetween such that they are associated with the first sensing electrodes, respectively;
driving switching circuits electrically connecting the second driving electrodes to the first driving electrodes, respectively, or to a low-level voltage source; and
a touch driver circuit configured to supply touch driving signals to the first driving electrodes and to detect touch sensing signals through the first sensing electrodes to detect touch position coordinates.
2 . The touch sensing module of claim 1 , wherein the driving switching circuits comprise
first driving switching circuits configured to electrically connect/disconnect the second driving electrodes to/from the first driving electrodes, respectively, in response to a first switching control signal from the touch driver circuit; and
second driving switching circuits configured to electrically connect/disconnect the second driving electrodes to/from the low-level voltage source in response to a second switching control signal from the touch driver circuit.
3 . The touch sensing module of claim 2 , wherein the first driving switching circuits comprise at least one first switching element configured to electrically connect/disconnect at least one of the second driving electrodes to/from at least one of the first driving electrodes in response to the first switching control signal, and
wherein the second driving switching circuits comprise at least one second switching element configured to electrically connect/disconnect at least one of the second driving electrodes to/from the low-level voltage source in response to the second switching control signal.
4 . The touch sensing module of claim 3 , wherein the touch driver circuit, in a non-touch sensing period, is configured to supply the second switching control signal of a gate-on level to the second driving switching circuits, and the first switching control signal of a gate-off level to the first driving switching circuits.
5 . The touch sensing module of claim 3 , wherein the touch driver circuit, in a touch sensing period, is configured to supply the second switching control signal of a gate-off level to the second driving switching circuits, and the first switching control signal of a gate-on level to the first driving switching circuits.
6 . The touch sensing module of claim 2 , wherein the touch driver circuit is configured to control the driving switching circuits so that the second driving electrodes are electrically disconnected from the first driving electrodes and connected to the low-level voltage source during a non-touch sensing period, and to supply touch driving signals to the first driving electrodes to detect the touch sensing signals through the first sensing electrodes during the non-touch sensing period.
7 . The touch sensing module of claim 6 , wherein the touch driver circuit is configured to control the driving switching circuits so that the second driving electrodes are electrically connected to the first driving electrodes and disconnected from to the low-level voltage source during a touch sensing period, and to supply touch driving signals to the first driving electrodes to detect the touch sensing signals through the first sensing electrodes during the touch sensing period.
8 . The touch sensing module of claim 6 , wherein the first sensing electrodes and the second sensing electrodes are electrically connected through at least one contact hole or at least one line.
9 . The touch sensing module of claim 2 , wherein the first driving electrodes are arranged in a first axis direction and a second axis direction, and adjacent ones of the first driving electrodes in the first axis direction are electrically connected while adjacent ones of the first driving electrodes in the second axis direction are electrically separated, and
wherein adjacent ones of the first driving electrodes in the first axis direction are electrically connected through connection electrodes.
10 . The touch sensing module of claim 9 , wherein the first sensing electrodes are arranged in the first axis direction and the second axis direction, and adjacent ones of the first driving electrodes in the first axis direction are electrically connected while wherein adjacent ones of the first sensing electrodes in the first axis direction are electrically separated, and
wherein the second sensing electrodes are all separated and electrically connected to the first sensing electrodes on a front side through at least one contact hole.
11 . The touch sensing module of claim 9 , wherein the second driving electrodes are arranged in the first axis direction and the second axis direction, and adjacent ones of the second driving electrodes in the first axis direction are electrically connected while adjacent ones of the second driving electrodes in the second axis direction are electrically separated, and
wherein adjacent ones of the second driving electrodes in the first axis direction are in direct contact with each other and electrically connected to each other.
12 . The touch sensing module of claim 11 , wherein the connection electrodes are made of a same material as the second driving electrodes and are formed on a same layer as the second driving electrodes such that they are not electrically in contact with the second driving electrodes, and
wherein adjacent ones of the first driving electrodes are electrically connected by a plurality of contact holes.
13 . The touch sensing module of claim 1 , wherein at least one of the first driving electrodes, the first sensing electrodes, the second driving electrodes, or the second sensing electrodes is formed of a transparent metal material comprising indium tin oxide (ITO).
14 . The touch sensing module of claim 1 , wherein the driving switching circuits and the touch driver circuit are integrated and formed as an integrated circuit, and the integrated circuit is on a circuit film or a circuit board separately from the first and second driving electrodes.
15 . A display device comprising:
a display panel comprising a display area in which sub-pixels are arranged; and
a touch sensing module on a front side of the display panel to sense a touch,
wherein the touch sensing module comprises:
first driving electrodes arranged in parallel;
first sensing electrodes intersecting the first driving electrodes;
second driving electrodes on a rear side of the first driving electrode with a touch insulating layer therebetween such that they are associated with the first driving electrodes, respectively;
second sensing electrodes on a rear side of the first sensing electrodes with the touch insulating layer therebetween such that they are associated with the first sensing electrodes, respectively;
driving switching circuits configured to electrically connect the second driving electrodes to the first driving electrodes, respectively, or to a low-level voltage source; and
a touch driver circuit configured to supply touch driving signals to the first driving electrodes and to detect touch sensing signals through the first sensing electrodes to detect touch position coordinates.
16 . The display device of claim 15 , wherein the driving switching circuits comprise
first driving switching circuits configured to electrically connect/disconnect the second driving electrodes to/from the first driving electrodes, respectively, in response to a first switching control signal from the touch driver circuit; and
second driving switching circuits configured to electrically connect/disconnect the second driving electrodes to/from the low-level voltage source in response to a second switching control signal from the touch driver circuit.
17 . The display device of claim 16 , wherein the first driving switching circuits comprise at least one first switching element configured to electrically connect/disconnect at least one of the second driving electrodes to/from at least one of the first driving electrodes in response to the first switching control signal, and
wherein the second driving switching circuits comprise at least one second switching element configured to electrically connect/disconnect at least one of the second driving electrodes to/from the low-level voltage source in response to the second switching control signal.
18 . The display device of claim 16 , wherein the touch driver circuit is configured to control the driving switching circuits so that the second driving electrodes are electrically disconnected from the first driving electrodes and connected to the low-level voltage source during a non-touch sensing period, and to supply touch driving signals to the first driving electrodes to detect the touch sensing signals through the first sensing electrodes during the non-touch sensing period.
19 . The display device of claim 16 , wherein the first driving electrodes are arranged in a first axis direction and a second axis direction, and adjacent ones of the first driving electrodes in the first axis direction are electrically connected while adjacent ones of the first driving electrodes in the second axis direction are electrically separated, and
wherein adjacent ones of the first driving electrodes in the first axis direction are electrically connected through connection electrodes.
20 . The display device of claim 19 , wherein the first sensing electrodes are arranged in the first axis direction and the second axis direction, and adjacent ones of the first driving electrodes in the first axis direction are electrically connected while adjacent ones of the first sensing electrodes in the first axis direction are electrically separated, and
wherein the second sensing electrodes are all separated and electrically connected to the first sensing electrodes on a front side through at least one contact hole.