Sensor-equipped display device and method of controlling the same
A first substrate includes a gate line extending in a first direction, a source line extending in a second direction intersecting the first direction, a switching element which is connected to the gate line and the source line, and a pixel electrode which is connected to the switching element. The first substrate includes a common electrode which is opposed to the pixel electrode, and a detection electrode element necessary for sensing a state of closeness of a conductor brought externally, that extends parallel to the common electrode and is formed of a metallic material. By this structure, power consumption of a drive electrode of an input sensor can be reduced, and improvement of a drive frequency can be obtained.
1. A sensor equipped display device comprising:
a first substrate comprising a plurality of gate lines extending in a first direction,
a plurality of source lines extending in a second direction intersecting the first direction,
a plurality of switching elements which are electrically connected to corresponding gate lines of the plurality of gates lines and corresponding source lines of the plurality of source lines, and
a plurality of pixel electrodes which are electrically connected to corresponding switching elements of the plurality of switching elements;
a plurality of common electrodes which are coupled to a first driving circuit, are opposed to corresponding pixel electrodes of the plurality of pixel electrodes and extend in the first direction, wherein the plurality of common electrodes are driven in a display period; and
a plurality of driving electrodes which are coupled to a second driving circuit, extend parallel to the plurality of common electrodes, and are driven for sensing an external approaching object in a sensor driving period, wherein
the plurality of driving electrodes do not overlap the plurality of common electrodes and the plurality of pixel electrodes in a top view, and wherein
in a period of driving a group of the plurality of driving electrodes, a corresponding group of the plurality of common electrodes is switched from a fixed potential to a floating state.
2. The sensor-equipped display device according to claim 1 , further comprising:
a plurality of detection electrodes intersecting the plurality of driving electrodes for sensing the external approaching object in combination with the plurality of driving electrodes.
3. The sensor-equipped display device according to claim 2 , wherein the plurality of detection electrodes are arranged on a second substrate which is opposed to the first substrate.
4. The sensor-equipped display device according to claim 3 , further comprising a liquid crystal layer interposed between the first and second substrates, opposed to the gate line and the detection electrode element, and the second substrates comprises a light-shielding film extending in the first direction.
5. The sensor-equipped display device according to claim 2 , further comprising:
a detection circuit coupled to the detection electrodes,
the first driving circuit supplies a common driving signal to each of the common electrodes at a time of display driving for displaying an image by using the pixel electrode; and
the second driving circuit supplies a sensor driving signal to each of the plurality of driving electrodes at a time of sensing driving for performing the sensing, wherein
the detection circuit receives a sensor detection signal in response to the driving electrodes.
6. The sensor-equipped display device according to claim 1 , wherein the plurality of driving electrodes are positioned in a same layer as a layer in which the common electrodes are arranged.
7. The sensor-equipped display device according to claim 1 , wherein the plurality of driving electrodes are positioned in a same layer as a layer in which the pixel electrode is arranged.
8. The sensor-equipped display device according to claim 1 , wherein the plurality of driving electrodes are parallel and such that they correspond to the common electrodes, respectively.
9. The sensor-equipped display device according to claim 1 , wherein
the first driving circuit supplies a common driving signal to each of the common electrodes at a time of display driving for displaying an image by using the pixel electrode; and
the second driving circuit supplies a sensor driving signal to each of the plurality of driving electrodes at a time of sensing driving for performing the sensing.
10. The sensor-equipped display device according to claim 9 , wherein
the second driving circuit receives a sensor detection signal from the driving electrodes.
11. The sensor-equipped display device according to claim 1 , wherein the first driving circuit keeps the common electrode at a fixed potential at the time of display driving for displaying an image by using the pixel electrode.
12. The sensor-equipped display device according to claim 1 , wherein the first driving circuit switches a state of the common electrode to an electrically floating state at the time of sensing driving.
13. The sensor-equipped display device according to claim 1 , wherein
at least two of the common electrodes are electrically coupled to each other.
14. The sensor-equipped display device according to claim 13 , wherein
at least two of the driving electrodes are electrically coupled to each other.
15. The sensor-equipped display device according to claim 14 , wherein
a number of the common electrodes which are electrically coupled to each other is same as a number of the driving electrodes which are electrically coupled to each other.