Touch display panel

Abstract

This application provides a touch display panel, which includes a touch layer, a plurality of intersecting and insulated touch electrode chains, and a plurality of first touch signal lines. The touch display panel also includes a plurality of second touch signal lines. Touch signals are transmitted simultaneously from the beginning and end of the touch electrode chains through the first and second touch signal lines connected in parallel, thereby reducing the impedance in the lines and improving the touch performance of the touch display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a touch display panel. Background Technology

[0002] With the development of display panel technology, narrower bezels and higher screen-to-body ratios have become the current trend. This means that the space for signal lines is further compressed, and the width of the signal lines is further reduced, resulting in a greater load on each signal line, which may affect performance. As the panel size increases, this effect will be amplified.

[0003] Existing integrated touch functionality solutions typically place the touch electrode pattern and related signal lines after the packaging process. The touch electrode pattern is located above the display area, and the touch signal lines are routed through the bezel to the touch driver chip. For small-sized panels with ample bezels, impedance can be reduced by widening the traces to meet touch performance requirements. However, as bezels are further compressed and panel sizes increase, this traditional approach cannot meet the touch performance demands.

[0004] In summary, existing touch display panels suffer from reduced touch performance due to high impedance in the circuitry. Therefore, it is necessary to provide a touch display panel that can overcome this deficiency. Summary of the Invention

[0005] This application provides a touch display panel that can reduce the impedance in the circuit, thereby improving touch performance.

[0006] This application provides an embodiment including:

[0007] substrate;

[0008] A driving circuit layer is disposed on the substrate;

[0009] A light-emitting device layer is disposed on the side of the driving circuit layer away from the substrate;

[0010] An encapsulation layer is disposed on the side of the light-emitting device layer away from the driving circuit layer; and

[0011] A touch layer is disposed on the side of the encapsulation layer away from the light-emitting device layer, and the touch layer includes:

[0012] Multiple intersecting and insulated chains of touch electrodes, each chain comprising multiple touch electrodes connected in series; and

[0013] Multiple first touch signal lines;

[0014] The touch display panel includes multiple second touch signal lines, which are disposed on a different layer from the touch layer and are connected in parallel with the corresponding first touch signal lines. The first touch signal lines and the second touch signal lines connected in parallel are electrically connected to the beginning and end of the same corresponding touch electrode chain.

[0015] According to one embodiment of this application, the second touch signal line is disposed on the driving circuit layer.

[0016] According to one embodiment of this application, the driving circuit layer includes a source / drain electrode metal layer, and the second touch signal line is disposed on the same layer as the source / drain electrode metal layer.

[0017] According to one embodiment of this application, the driving circuit layer includes a source / drain electrode metal layer, and the second touch signal line is disposed in a different layer from the source / drain electrode metal layer.

[0018] According to one embodiment of this application, the touch electrode chain includes:

[0019] Multiple first touch electrode chains, each first touch electrode chain including multiple first touch electrodes connected in series and spaced apart along a first direction;

[0020] Multiple second touch electrode chains intersect and are insulated from the first touch electrode chain. Each second touch electrode chain includes multiple second touch electrodes connected in series and spaced apart along a second direction, where the first direction is different from the second direction.

[0021] The first touch signal line and the second touch signal line, which are connected in parallel, are electrically connected to the beginning and end of the same first touch electrode chain, respectively.

[0022] According to one embodiment of this application, the touch display panel includes a display area, a lower frame area disposed on one side of the display area, and an upper frame area disposed on the opposite side of the display area. The lower frame area is provided with a plurality of terminals, and the first touch signal line and the second touch signal line, which are connected in parallel to each other, are electrically connected to the same terminal.

[0023] The first touch signal line is electrically connected to one end of the corresponding first touch electrode chain near the lower frame area, and the second touch signal line is electrically connected to one end of the corresponding first touch electrode chain near the upper frame area.

[0024] According to one embodiment of this application, the second touch signal line extends from the lower border area through the display area to the upper border area.

[0025] According to one embodiment of this application, the touch display panel includes side frame areas disposed on opposite sides of the display area and located between the upper frame area and the lower frame area, and the touch layer further includes multiple third touch signal lines;

[0026] The third touch signal line is electrically connected to the corresponding second touch electrode chain via the side frame area.

[0027] According to one embodiment of this application, the first touch electrode is a touch driving electrode, and the second touch electrode is a touch sensing electrode.

[0028] According to one embodiment of this application, the first touch electrode is a touch sensing electrode, and the second touch electrode is a touch driving electrode.

[0029] The beneficial effects of this application embodiment are as follows: This application embodiment provides a touch display panel, which includes a substrate, a driving circuit layer, a light-emitting device layer, an encapsulation layer, and a touch layer stacked sequentially. The touch layer includes multiple intersecting and insulated touch electrode chains and multiple first touch signal lines. The touch display panel also includes multiple second touch signal lines, which are disposed on a different layer from the touch layer and are connected in parallel with the corresponding first touch signal lines. The first touch signal lines and second touch signal lines connected in parallel are electrically connected to the beginning and end of the same touch electrode chain, respectively. Touch signals are transmitted from the beginning and end of the touch electrode chain to the touch electrode chain simultaneously through the first touch signal lines and second touch signal lines connected in parallel, thereby reducing the impedance in the circuit and improving the touch performance of the touch display panel. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the stacked structure of the touch display panel provided in the embodiments of this application;

[0032] Figure 2 A plan view of the touch display panel provided in the embodiments of this application;

[0033] Figure 3 A schematic diagram showing the distribution of the first touch signal line and the second touch signal line provided in the embodiments of this application;

[0034] Figure 4This is a superimposed diagram of the touch display panel in the display area provided in the embodiments of this application;

[0035] Figure 5 This is a superimposed diagram of the touch display panel in the upper bezel area provided in an embodiment of this application. Detailed Implementation

[0036] The following descriptions of the embodiments are based on the accompanying illustrations and are used to illustrate specific embodiments in which this application can be implemented. Directional terms used in this application, such as [up], [down], [front], [back], [left], [right], [inner], [outer], [side], etc., are only for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative and understanding purposes and not for limiting the application. In the figures, structurally similar units are represented by the same reference numerals.

[0037] The present application will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] This application provides a touch display panel that can reduce the impedance in the circuit, thereby improving touch performance.

[0039] like Figure 1 As shown, Figure 1 This is a schematic diagram of the stacked structure of a touch display panel provided in an embodiment of this application. The touch display panel includes a substrate 10, a driving circuit layer 20 disposed on the substrate 10, a light-emitting device layer 30 disposed on the side of the driving circuit layer 20 away from the substrate 10, an encapsulation layer 40 disposed on the side of the light-emitting device layer 30 away from the driving circuit layer 20, and a touch layer 50 disposed on the side of the encapsulation layer 40 away from the light-emitting device layer 30. It should be noted that "disposed on the substrate 10" can mean that it is in direct contact with the substrate 10 or indirect contact with the substrate 10.

[0040] like Figure 2 As shown, Figure 2 This is a plan view of a touch display panel provided in an embodiment of this application. The touch layer 50 includes multiple touch electrode chains that are arranged in a crisscross manner, and each touch electrode chain includes multiple touch electrodes connected in series.

[0041] In this embodiment, the touch display panel is a mutual capacitance touch display panel, and the multiple intersecting touch electrode chains include multiple first touch electrode chains and multiple second touch electrode chains. The first touch electrode chain includes multiple first touch electrodes 51 connected in series, and the multiple first touch electrodes 51 are distributed at intervals along the first direction Y.

[0042] The second touch electrode chain includes a plurality of second touch electrodes 52 connected in series. The plurality of second touch electrodes 52 are distributed at intervals along the second direction X. The first touch electrode chain and the second touch electrode chain intersect each other and are insulated from each other. During the touch scanning sampling stage, the first touch electrode 51 and the second touch electrode 52 can form a capacitor.

[0043] The first direction Y is different from the second direction X. In this embodiment, the first direction Y is a vertical direction, the second direction X is a horizontal direction, and the first direction Y and the second direction X are perpendicular to each other.

[0044] The touch layer 50 further includes multiple first touch signal lines 53 and multiple third touch signal lines 54. The first touch signal lines 53 are electrically connected to the corresponding first touch electrode chains to transmit touch signals to the corresponding first touch electrode chains. The third touch signal lines 54 are electrically connected to the corresponding second touch electrode chains to transmit touch signals to the corresponding second touch electrode chains.

[0045] Furthermore, the touch display panel also includes multiple second touch signal lines 21. The second touch signal lines 21 are disposed on a different layer from the touch layer 50. The second touch signal lines 21 are connected in parallel with the corresponding first touch signal lines 53. The first touch signal lines 53 and the second touch signal lines 21 connected in parallel are electrically connected to the beginning and end of the same corresponding touch electrode chain.

[0046] In one embodiment, the first touch electrode 51 is a touch driving electrode, and the second touch electrode 52 is a touch sensing electrode. The first touch signal line 53 and the second touch signal line 21, which are connected in parallel, are electrically connected to the beginning and end of the same first touch electrode chain, respectively. During the touch scanning phase, the first touch signal line 53 and the second touch signal line 21 can simultaneously transmit touch driving signals to the first touch electrode chain.

[0047] It should be noted that, due to the inherent resistance of the first touch electrode 51, if the touch driving signal is transmitted to only one end of the first touch electrode 51 through the first touch signal line 53, there will be a certain delay in the touch driving signal received by the first touch electrode 51, which is farther away from the first touch signal line 53, resulting in a decrease in the touch sensitivity of the touch display panel. By transmitting touch driving signals to both ends of the first touch electrode chain simultaneously through the first touch signal line 53 and the second touch signal line 21, the delay in the touch driving signal received by the first touch electrode 51 at different positions can be improved, thereby increasing the touch sensitivity of the touch display panel.

[0048] In one embodiment, the first touch electrode 51 may also be a touch sensing electrode, and the second touch electrode 52 may be a touch driving electrode. The first touch signal line 53 and the second touch signal line 21, which are connected in parallel, are electrically connected to the beginning and end of the same second touch electrode chain, so as to transmit touch sensing signals to the second touch electrode chain at the same time.

[0049] Furthermore, the touch display panel includes a display area A1, and the first touch electrode 51 and the second touch electrode 52 are both disposed within the display area A1. The touch display panel also includes a lower border area A2 disposed on one side of the display area A1, and an upper border area A3 disposed on the opposite side of the display area A1. The touch display panel also includes side border areas A4 disposed on opposite sides of the display area A1 and located between the upper border area A3 and the lower border area A2.

[0050] The lower border area A2 includes a binding area A21, a bending area A22, and a wiring area A23. The wiring area A23 is located between the bending area A22 and the display area A1, and the binding area A21 is located on the side of the bending area A22 away from the wiring area A23.

[0051] The bonding area A21 is provided with multiple terminals 22. The touch driver chip and the display driver chip can be directly bonded to the corresponding terminals. Alternatively, the touch driver chip and the display driver chip can be first bonded to a flexible printed circuit board, and then the flexible printed circuit board can be bonded to the corresponding terminals 22. The touch driver chip, the display driver chip, and the flexible printed circuit board can be bent together with the bonding area A21 to the back of the touch display panel, thereby reducing the width of the lower border area A2 on the front of the touch display panel.

[0052] Furthermore, the first touch signal line 53 and the second touch signal line 21, which are connected in parallel, are electrically connected to the same terminal 22.

[0053] Combination Figure 2 and Figure 3 As shown, Figure 3 This is a schematic diagram showing the distribution of the first touch signal line and the second touch signal line in an embodiment of this application, located at... Figure 3Taking the leftmost first touch signal line 53 and the second touch signal line 21 as an example, one end of the touch signal line 55 is connected to the corresponding terminal 22, and the other end of the touch signal line 55 extends from the binding area A21 through the bending area A22 to the area between the bending area A22 and the display area A1. The area between the bending area A22 and the display area A1 of the touch signal line 55 is connected to the first touch signal line 53 and the second touch signal line 21 respectively.

[0054] like Figure 4 As shown, Figure 4 The above is a superimposed diagram of the touch display panel in the display area provided in the embodiment of this application. The driving circuit layer 20 may include a light-shielding layer 201, a buffer layer 202, an active layer 203, a gate insulating layer 204, a gate metal layer 205, an interlayer dielectric layer 206, a source / drain electrode metal layer 207, a passivation protection layer 208, and a planarization layer 209, which are stacked together.

[0055] The light-emitting device layer 30 includes an anode 301, a pixel definition layer 302, a light-emitting layer 303, and a cathode 304 stacked on the planarization layer 209.

[0056] The encapsulation layer 40 may include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer stacked together. The structure of the encapsulation layer 40 is not limited to the stacked structure of inorganic and organic encapsulation layers in the above embodiments, and may also include only one inorganic encapsulation layer or other structures, which are not limited here.

[0057] The touch layer 50 may include a first protective layer 501, a first touch metal layer 502, a touch insulating layer 503, a second touch metal layer 504, and a second protective layer 505 stacked together. The first touch electrode 51, the second touch electrode 52, the first touch signal line 53, and the third touch signal line 54 may all be disposed on the second touch metal layer 504. Two adjacent first touch electrodes 51 or two adjacent second touch electrodes 52 may be connected by cross-line connection through the first touch electrode layer 502.

[0058] It should be noted that the first touch electrode 51, the second touch electrode 52, the first touch signal line 53 and the third touch signal line 54 can all be grid-shaped. The light-emitting devices in the light-emitting device layer 30 can be aligned with the grid formed by the intersection of each grid line, and the light emitted by the light-emitting devices can be emitted through the grid.

[0059] In this embodiment, in the bonding area A21, the touch signal trace 55 can be disposed within the touch layer 50; in the bending area A22, the touch signal trace 55 can be routed through a via between the touch layer 50 and the driving circuit layer 20 to the driving circuit layer 20, and extend within the driving circuit layer 20 to the trace area A23. In the trace area A23, the first touch signal line 53 is connected to the touch signal trace 55 through a via between the touch layer 50 and the driving circuit layer 20. The first touch signal line 53 can extend within the touch layer 50 from the area between the bending area A22 and the display area A1 to the display area A1, and connect to one end of a corresponding first touch electrode chain near the lower frame area A2.

[0060] The second touch signal line 21 can be disposed on the driving circuit layer 20.

[0061] In one embodiment, the second touch signal line 21 is disposed on the same layer as the source / drain electrode metal 207. For example... Figure 4 As shown, the source and drain electrode metal layer 207 may include multiple patterned source and drain electrodes, as well as multiple data lines extending along the first direction Y. The second touch signal line 21 is disposed on the same layer as the source and drain electrode metal layer 207.

[0062] Furthermore, the second touch signal line 21 can be made of the same material as the source / drain electrode metal layer 207, and the second touch signal line 21 can be formed using the same metal film deposition process as the source / drain electrode metal layer 207.

[0063] Combination Figures 3 to 5 As shown, Figure 5 The above diagram shows the overlay of the touch display panel in the upper frame area provided in this application embodiment. In the wiring area A23, the second touch signal line 21 is connected to the touch signal wiring line 55, and then extends along the first direction Y in the driving circuit layer 20 from the lower frame area A2 through the display area A1 to the upper frame area A3. The second touch signal line 21 is connected to the wiring in the second touch metal layer 504 through the via between the touch layer 50 and the driving circuit layer 20 in the upper frame area A3. This wiring is connected to one end of the first touch electrode chain near the upper frame area A3.

[0064] In the lower frame area A2, one end of the third touch signal line 54 is connected to the corresponding terminal 22, and the other end of the third touch signal line 54 can extend to the side frame area A4 via the binding area A21, the bending area A22 and the wiring area A23.

[0065] Within the binding area A21 and the area between the binding area A21 and the bending area A22, the third touch signal line 54 can be disposed within the touch layer 50; in the bending area A22, the touch signal trace 55 can be routed to the driving circuit layer 20 through a via between the touch layer 50 and the driving circuit layer 20; in the routing area A23 between the bending area A22 and the display area A1, the third touch signal line 54 can be routed to the touch layer 50, and then extend from the lower frame area A2 to the side frame area A4 in the touch layer 50, and connect to the corresponding second touch electrode chain.

[0066] It should be noted that the structure of the first touch signal line 53 and the third touch signal line 54 being switched from the driving circuit layer 20 to the touch layer 50 in the wiring area A23 can be referred to as follows. Figure 5 The overlay diagram of the upper border area shown is not illustrated here.

[0067] It should be noted that within the bending region A22, both the touch signal trace 55 and the third touch signal line 54 are disposed within the driving circuit layer 20. This reduces the number of film layers in the bending region A22, alleviates the bending stress in the bending region A22, and thus prevents the touch signal trace 55 and the third touch signal line 54 from breaking in the bending region A22. The touch signal trace 55 and the third touch signal line 54 can be disposed in the same layer as the source / drain electrode metal layer within the driving circuit layer 20, or they can be disposed in other metal film layers within the driving circuit layer 20 other than the source / drain electrode metal layer.

[0068] In one embodiment, the second touch signal line 21 is disposed on a different layer from the source / drain electrode metal 207. For example, a metal layer can be added to the existing driving circuit layer 20 structure, and this metal layer can be used to form multiple second touch signal lines 21. Preferably, the second touch signal line 21 can be disposed on the side of the source / drain electrode metal layer 207 away from the substrate 10.

[0069] It should be noted that, Figure 4 and Figure 5 This illustration only shows the film layer stacking of the touch display panel and does not represent the actual film layer stacking of the touch display panel in actual application. The touch display panel may include one or two or more source / drain electrode metal layers and other metal layers. The second touch signal line 21 may be disposed on the same layer as any of the source / drain electrode metal layers or other metal layers. Alternatively, the second touch signal line 21 may be disposed on a different layer from the source / drain electrode metal layers or other metal layers in the driving circuit layer 20. No restrictions are imposed here.

[0070] The beneficial effects of this application embodiment are as follows: This application embodiment provides a touch display panel, which includes a substrate, a driving circuit layer, a light-emitting device layer, an encapsulation layer, and a touch layer stacked sequentially. The touch layer includes multiple intersecting and insulated touch electrode chains and multiple first touch signal lines. The touch display panel also includes multiple second touch signal lines, which are disposed on a different layer from the touch layer and are connected in parallel with the corresponding first touch signal lines. The first touch signal lines and second touch signal lines connected in parallel are electrically connected to the beginning and end of the same touch electrode chain, respectively. Touch signals are transmitted from the beginning and end of the touch electrode chain to the touch electrode chain simultaneously through the first touch signal lines and second touch signal lines connected in parallel, thereby reducing the impedance in the circuit and improving the touch performance of the touch display panel.

[0071] In summary, although the present application discloses the preferred embodiments as described above, the above preferred embodiments are not intended to limit the present application. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application is based on the scope defined by the claims.

Claims

1. A touch display panel, characterized in that, include: substrate; A driving circuit layer is disposed on the substrate; A light-emitting device layer is disposed on the side of the driving circuit layer away from the substrate; An encapsulation layer is disposed on the side of the light-emitting device layer away from the driving circuit layer; as well as A touch layer is disposed on the side of the encapsulation layer away from the light-emitting device layer, and the touch layer includes: Multiple intersecting and insulated chains of touch electrodes, each chain comprising multiple touch electrodes connected in series; and Multiple first touch signal lines; The touch display panel includes multiple second touch signal lines, which are disposed on a different layer from the touch layer and are connected in parallel with the corresponding first touch signal lines. The first and second touch signal lines connected in parallel are electrically connected to the beginning and end of the same corresponding touch electrode chain. The touch display panel includes a display area, a lower border area disposed on one side of the display area, and an upper border area disposed on the opposite side of the display area. The second touch signal lines are disposed on the driving circuit layer and extend from the lower border area through the display area to the upper border area. The second touch signal lines are electrically connected in the upper border area to the end of the corresponding touch electrode chain near the upper border area.

2. The touch display panel as described in claim 1, characterized in that, The driving circuit layer includes a source / drain electrode metal layer, and the second touch signal line is disposed on the same layer as the source / drain electrode metal layer.

3. The touch display panel as described in claim 1, characterized in that, The driving circuit layer includes a source / drain electrode metal layer, and the second touch signal line is disposed on a different layer from the source / drain electrode metal layer.

4. The touch display panel as described in claim 1, characterized in that, The touch electrode chain includes: Multiple first touch electrode chains, each first touch electrode chain including multiple first touch electrodes connected in series and spaced apart along a first direction; Multiple second touch electrode chains intersect and are insulated from the first touch electrode chain. Each second touch electrode chain includes multiple second touch electrodes connected in series and spaced apart along a second direction, where the first direction is different from the second direction. The first touch signal line and the second touch signal line, which are connected in parallel, are electrically connected to the beginning and end of the same first touch electrode chain, respectively.

5. The touch display panel as described in claim 4, characterized in that, The lower frame area is provided with multiple terminals, and the first touch signal line and the second touch signal line, which are connected in parallel, are electrically connected to the same terminal. The first touch signal line is electrically connected to one end of the corresponding first touch electrode chain near the lower frame area, and the second touch signal line is electrically connected to one end of the corresponding first touch electrode chain near the upper frame area.

6. The touch display panel as described in claim 5, characterized in that, The touch display panel includes side frame areas disposed on opposite sides of the display area and located between the upper frame area and the lower frame area; the touch layer also includes multiple third touch signal lines. The third touch signal line is electrically connected to the corresponding second touch electrode chain via the side frame area.

7. The touch display panel as described in claim 4, characterized in that, The first touch electrode is a touch driving electrode, and the second touch electrode is a touch sensing electrode.

8. The touch display panel as described in claim 4, characterized in that, The first touch electrode is a touch sensing electrode, and the second touch electrode is a touch driving electrode.

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