Touch display panel and touch display device for removing display noise from a touch sensing signal
A touch display panel and a touch display device. A shield electrode is disposed between a display electrode and touch electrodes, is driven using a signal corresponding to a signal applied to the touch electrodes. Display noise is blocked using the shield electrode, so that the sensitivity of touch sensing signals received from the touch electrodes are improved. In addition, due to the improved sensitivity of touch sensing signals, the performance of touch sensing based on a change in the self-capacitance of the touch electrodes is improved. Both a touch sensing function based on a change in the self-capacitance of the touch electrodes and a touch sensing function based on a change in the mutual capacitance of the touch electrodes are provided.
1. A touch display device comprising:
a display electrode configured to receive a display driving voltage;
an encapsulation layer located above the display electrode;
a plurality of touch electrodes, located above the encapsulation layer, configured to receive a touch driving signal;
a shield electrode, disposed between the encapsulation layer and the plurality of touch electrodes, configured to receive a shield signal corresponding to the touch driving signal;
a plurality of touch lines disposed over the shield electrode, wherein the plurality of touch lines are electrically connected to the plurality of touch electrodes; and
at least one shield line disposed on a same layer as the plurality of touch lines, wherein the at least one shield line is insulated from the plurality of touch lines and the at least one shield line is electrically connected to at least one shield electrode.
2. The touch display device according to claim 1 , wherein the shield electrode has a first area and the display electrode has a second area, and the plurality of touch electrodes have a third area, and wherein the first area overlaps the second area, and the second area overlaps the third area.
3. The touch display device according to claim 1 , wherein the shield electrode overlaps at least a portion of an area between two adjacent touch electrodes among the plurality of touch electrodes.
4. The touch display device according to claim 1 , wherein the display electrode, the shield electrode, and the plurality of touch electrodes are insulated from each other.
5. The touch display device according to claim 1 , wherein the plurality of touch electrodes comprise a plurality of first touch electrodes in a first direction and a plurality of second touch electrodes in a second direction, wherein the second direction intersects the first direction, and the shield electrode comprises a plurality of first shield electrodes in a third direction wherein the third direction corresponds with the first direction and a plurality of second shield electrodes in a fourth direction, wherein the fourth direction corresponds with the second direction.
6. The touch display device according to claim 5 , wherein a first area including the plurality of first shield electrodes is greater than a second area including the plurality of first touch electrodes, and a third area including the plurality of second shield electrodes is greater than a fourth area including the plurality of second touch electrodes.
7. The touch display device according to claim 5 , further comprising:
a first touch electrode connecting pattern including at least one first pattern element connecting the plurality of first touch electrodes;
a second touch electrode connecting pattern including at least one second pattern element connecting the plurality of second touch electrodes;
a first shield electrode connecting pattern including at least one third pattern element connecting the plurality of first shield electrodes; and
a second shield electrode connecting pattern including at least one fourth pattern element connecting the plurality of second shield electrodes,
wherein the first touch electrode connecting pattern and the first shield electrode connecting pattern are disposed on the same layer; and
at least a portion of the second touch electrode connecting pattern overlaps at least a portion of the second shield electrode connecting pattern.
8. The touch display device according to claim 5 , wherein, during a first period, the touch driving signal is applied to at least one first touch electrode among the plurality of first touch electrodes, and the shield signal is applied to at least one first shield electrode among the plurality of first shield electrodes, and
during a second period, the touch driving signal is applied to at least one second touch electrode among the plurality of second touch electrodes, and the shield signal is applied to at least one second shield electrode among the plurality of second shield electrodes.
9. The touch display device according to claim 1 , further comprising:
a touch part including the plurality of touch electrodes and the shield electrode; and
a display part including the display electrode and the encapsulation layer, wherein the shield electrode and the display part form an in-cell structure.