Embedded touch panel and display device
The present disclosure discloses an embedded touch panel and display device. The embedded touch panel comprises an upper substrate, a lower substrate opposite to the upper substrate, multiple pixel units disposed on a plane of the lower substrate facing the upper substrate, wherein each of the pixel units comprises a bottom-emitting OLED pixel structure and a pixel circuit; a plurality of independent self-capacitance electrodes disposed between the lower substrate and the pixel units and insulated from the pixel units; a touch sensing chip which determines a touch position by detecting a change in capacitance of each of the self-capacitance electrodes during a touch duration; and wires disposed between the lower substrate and the OLED pixel structure, each of the wires corresponding to each of the self-capacitance electrodes and connecting the self-capacitance electrode to the touch sensing chip.
1. An embedded touch panel comprising:
an upper substrate;
a lower substrate opposite to the upper substrate, the lower substrate including a display region and a non-display region adjacent to the display region;
multiple pixel units positioned on a plane of the lower substrate facing the upper substrate in the display region, wherein each of the pixel units comprises a bottom-emitting OLED pixel structure and a pixel circuit;
a plurality of independent self-capacitance electrodes positioned in the display region and between the lower substrate and the pixel units, and insulated from the pixel units;
a touch sensing chip positioned on the plane of the lower substrate facing the upper substrate in the non-display region to determine a touch position by detecting a change in capacitance of each of the self-capacitance electrodes during a touch duration; and
multiple wires disposed between the self-capacitance electrodes and the pixel circuits, each of the wires connecting a corresponding one of the self-capacitance electrodes to the touch sensing chip.
2. The embedded touch panel according to claim 1 , wherein each self-capacitance electrode includes a grid shape.
3. The embedded touch panel according to claim 2 , wherein each self-capacitance electrode comprises metal.
4. The embedded touch panel according to claim 3 , further comprising a black matrix area disposed between the upper substrate and the lower substrate, and between adjacent OLED pixel structures, wherein a positive projection of the black matrix area onto the lower substrate covers a positive projection of the self-capacitance electrodes onto the lower substrate.
5. The embedded touch panel according to claim 1 , wherein each self-capacitance electrode comprises a transparent electrically conductive material.
6. The embedded touch panel according to claim 5 , wherein each self-capacitance electrode includes a block shape, and wherein a positive projection of the self-capacitance electrodes onto the lower substrate covers a positive projection of at least one of the pixel units onto the lower substrate.
7. The embedded touch panel according to claim 1 , wherein each of the wires is arranged at the same layer as an electrode in the pixel circuit and comprises the same material as the electrode in the pixel circuit, and wherein each of the wires is electrically connected to its corresponding self-capacitance electrode through a via hole.
8. The embedded touch panel according to claim 1 , wherein each wire is arranged at the same layer as its corresponding self-capacitance electrode and comprises the same material as its corresponding self-capacitance electrode.
9. The embedded touch panel according to claim 1 , further comprising an insulation layer positioned between the self-capacitance electrodes and the pixel units.
10. The embedded touch panel according to claim 9 , wherein the OLED pixel structure comprises an anode layer, an organic light-emitting layer and a cathode layer, which are sequentially layered on the insulation layer.
11. The embedded touch panel according to claim 10 , wherein the OLED pixel structure further comprises a pixel defining layer disposed around the anode layer and the organic light-emitting layer.
12. The embedded touch panel according to claim 10 , further comprising a thin-film transistor disposed between the insulation layer and the OLED pixel structure, wherein the thin-film transistor comprises a gate, a gate insulation layer, an active layer, a source and a drain, which are sequentially disposed on the insulation layer, and wherein the source and the drain are positioned at the same layer.
13. The embedded touch panel according to claim 12 , further comprising a planarization layer disposed between the OLED pixel structure and the gate insulation layer.
14. The embedded touch panel according to claim 13 , wherein each wire is arranged at the same layer as the gate, and wherein each wire is electrically connected to its corresponding self-capacitance electrode through a via hole extending through the insulation layer.
15. The embedded touch panel according to claim 13 , wherein the anode layer is electrically connected to the drain through a via hole extending through the planarization layer.
16. A display device comprising a display including the embedded touch panel according to claim 1 .