A touch display panel and display device

Abstract

This application provides a touch display panel and display device in which the control chip of the touch display panel has an active surface, the active surface having a first side and a second side, and a display signal contact and a touch signal contact are disposed on the first side; a circuit board is disposed on the side of the control chip having the active surface; a first touch signal trace is electrically connected to the touch signal contact, and the first touch signal trace has a first portion overlapping with the projection of the active surface on the circuit board; the first portion is disposed between the projection of the first side on the circuit board and the projection of the second side on the circuit board; this application places the touch signal contact on the active surface, which is beneficial to improving the touch signal supply capability; and the first touch signal trace is arranged to run from the projection of the active surface on the circuit board to the second side, so that the first touch signal trace and the display signal trace extend from different sides of the control chip, which is beneficial to reducing the signal coupling between the display signal trace and the first touch signal trace.

Description

Technical Field

[0001] This application belongs to the field of display technology, and in particular relates to a touch display panel and display device. Background Technology

[0002] Touch display panels contain integrated circuit boards (ICs) and flexible printed circuit boards (FPCs). Currently, display signal traces are usually connected via integrated circuit boards, while touch signal traces are connected via flexible printed circuit boards.

[0003] However, as users' demands for display products increase, the internal wiring methods of display products also need to be improved. Summary of the Invention

[0004] The purpose of this application is to provide a touch display panel and display device, which aims to solve the problem of poor wiring in the internal wiring of display products in the conventional technology.

[0005] A first aspect of this application provides a touch display panel, comprising:

[0006] A control chip having an active surface, the active surface having a first side and a second side, the first side being provided with display signal contacts and touch signal contacts;

[0007] A circuit board is disposed on the side of the control chip having an active surface;

[0008] The display signal trace is electrically connected to the display signal contact, and the display signal trace extends out of the control chip along the first side;

[0009] A first touch signal trace is electrically connected to the touch signal contact. The first touch signal trace has a first portion that overlaps with the projection of the active surface on the circuit board, and a second portion that extends beyond the projection of the active surface on the circuit board.

[0010] The first portion is disposed between the projection of the first side on the circuit board and the projection of the second side on the circuit board.

[0011] In some embodiments of this application, the portion of the display signal traces located outside the control chip and the second portion extend in the same direction.

[0012] In some embodiments of this application, the first side and the second side are two adjacent sides on the active surface.

[0013] In some embodiments of this application, the second side is the side of the two adjacent sides of the first side that is closer to the display signal trace.

[0014] In some embodiments of this application, the first side is the output side of the active surface.

[0015] In some embodiments of this application, the active surface further has a third side, which is opposite to and spaced apart from the first side, and the third side is the input side of the active surface;

[0016] A routing area for the first touch signal to be routed within the active surface is defined between the first side and the third side.

[0017] In some embodiments of this application, the touch display panel further includes a second touch signal trace, one end of which is electrically connected to the end of the first touch signal trace that is away from the control chip;

[0018] The second touch signal trace overlaps with the projection portion of the display signal trace on the touch display panel, and a shielding layer is provided between the second touch signal trace and the display signal trace located in the overlapping area.

[0019] In some embodiments of this application, the shielding layer is the negative voltage signal layer in the touch display panel.

[0020] In some embodiments of this application, the second touch signal trace includes a first sub-signal trace and a second sub-signal trace. One end of the first sub-signal trace is electrically connected to the end of the first touch signal trace away from the control chip, and the other end of the first sub-signal trace is electrically connected to the display screen of the touch display panel.

[0021] One end of the second sub-signal trace is connected to the connection point between the first sub-signal trace and the first touch signal trace, and the other end of the second sub-signal trace is provided with a signal test contact.

[0022] In some embodiments of this application, the circuit board includes at least one conductive layer, and the first touch signal trace, which is disposed within the active surface, is disposed within the at least one conductive layer.

[0023] And / or, the circuit board includes at least two conductive layers, and the first touch signal traces disposed in the active surface are alternately disposed in the at least two conductive layers.

[0024] A second aspect of this application also provides a display device, including the aforementioned touch display panel.

[0025] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows: In the above-mentioned touch display panel and display device, the touch display panel includes a control chip, a circuit board, display signal traces, and a first touch signal trace; the control chip has an active surface, the active surface has a first side and a second side, and a display signal contact and a touch signal contact are disposed on the first side; the circuit board is disposed on the side of the control chip having the active surface; the display signal trace is electrically connected to the display signal contact, and the display signal trace extends out of the control chip along the first side; the first touch signal trace is electrically connected to the touch signal contact, and the first touch signal trace has an intersection with the projection of the active surface on the circuit board. The first part is stacked, and the second part extends beyond the projection of the active surface on the circuit board; wherein, the first part is disposed between the projection of the first side on the circuit board and the projection of the second side on the circuit board; in this application, on the one hand, the touch signal contact is disposed on the active surface of the control chip, and the touch signal can be transmitted through the control chip, which is beneficial to improving the supply capability of the touch signal; on the other hand, the first touch signal trace is disposed from the projection of the active surface on the circuit board to the second side, so that the first touch signal trace and the display signal trace extend from different sides of the control chip, which is beneficial to reducing the signal coupling between the display signal trace and the first touch signal trace. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a touch display panel provided in one embodiment of this application;

[0027] Figure 2 A schematic diagram of the structure of a touch display panel provided in a related technology of this application;

[0028] Figure 3 A schematic diagram of the structure of a touch display panel provided for another related technology of this application;

[0029] Figure 4 This is a schematic diagram of the structure of a touch display panel provided in another embodiment of this application.

[0030] Specific element symbol explanations: 1000 - Control chip, 100 - Active surface, 110 - First side, 111 - Display signal contact, 112 - Touch signal contact, 120 - Second side, 130 - Third side, 140 - Routing area, 200 - Display signal trace, 300 - First touch signal trace, 310 - First part, 320 - Second part, 400 - Second touch signal trace, 410 - First sub-signal trace, 420 - Second sub-signal trace, 500 - Signal test contact, a - First direction. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as being "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0035] In related technologies, display signal traces (such as array signals or GIP (Gate in Panel) signals) are often connected via integrated circuit boards, while touch signal traces (such as TP signals) are connected via flexible circuit boards. However, touch display panels using this wiring method have relatively weak touch signal supply capabilities, resulting in low sensitivity of the touch function.

[0036] Based on this, this application improves the related touch display panel and display device.

[0037] Please see Figure 1 , Figure 1A schematic diagram of the structure of the touch display panel provided in this embodiment is shown. The touch display panel of this embodiment includes a control chip 1000, a circuit board, a display signal trace 200, and a first touch signal trace 300. The control chip 1000 has an active surface 100, which has a first side 110 and a second side 120. A display signal contact 111 and a touch signal contact 112 are provided on the first side 110. The circuit board is disposed on the side of the control chip with the active surface. The display signal trace 200 is electrically connected to the display signal contact 111 and extends out of the control chip 1000 along the first side 110. The first touch signal trace 300 is electrically connected to the touch signal contact 112 and has a first portion 310 that overlaps with the projection of the active surface on the circuit board, and a second portion 320 that extends out of the projection of the active surface on the circuit board. The first portion 310 is disposed between the projection of the first side on the circuit board and the projection of the second side on the circuit board.

[0038] It should be explained that, in this embodiment, the control chip 1000 (IC) is the core of the entire touch display panel, used to process display signals and touch signals. The active surface 100 typically refers to the surface of a circuit board or IC that contains active components. The first side 110 can be the output side of the active surface 100 of the control chip 1000. The display signal contact 111 on the output side is used to output display signals, and the touch signal contact 112 on the output side is used to output touch signals. The display signal trace 200 is typically connected to the display screen to output display signals so that the display screen displays image information. The first touch signal trace 300 can output the TP signal.

[0039] It is understood that in some embodiments of this application, the touch signal contact 112 and the display signal contact 111 are co-located on the first side 110 of the active surface 100 of the control chip 1000. Touch signals can be directly transmitted through the touch signal contact 112 of the control chip 1000, which is beneficial to improving the supply capacity of touch signals.

[0040] Please refer to some related technologies. Figure 2 , Figure 2 A schematic diagram of a touch display panel provided by related technology is shown. Both the first touch signal line 300 and the display signal line 200 are led out from the first side 110, and the first touch signal line and the display signal line partially overlap (e.g., ...). Figure 2 The shaded area represents the overlapping region. This design improves the space utilization of the wiring structure. However, because the first touch signal line and the display signal line are close together and partially overlap, there is significant signal coupling between them.

[0041] In other related technologies, please refer to Figure 3 , Figure 3 A schematic diagram of a touch display panel provided by related technology is shown. Both the first touch signal trace 300 and the display signal trace 200 are led out from the first side 110, and the first touch signal trace 300 bypasses the display signal trace 200. This reduces the overlapping area between the first touch signal line and the display signal line, which helps to reduce signal coupling between them. However, this increases the space occupied by the trace structure (e.g., ...). Figure 3 The top and bottom width dimensions are not conducive to the narrow bezel design of the display panel.

[0042] It is understood that in some embodiments of this application, the first touch signal trace 300 is routed from the active surface 100 of the control chip 1000 in the projection area on the circuit board, and extends from a different side (second side 120) of the active surface 100 with the display signal trace 200. On the one hand, this increases the distance between the first touch signal trace 300 and the display signal trace 200, which helps to reduce the signal coupling between the first touch signal trace 300 and the display signal trace 200, and also does not increase the bezel size of the touch display panel. On the other hand, it reduces the overlapping area between the first touch signal trace 300 and the display signal trace 200, which in turn helps to reduce the signal coupling between the display signal trace 200 and the first touch signal trace 300, thereby improving the accuracy of the touch signal and the display signal.

[0043] Please refer to the embodiments described in this application. Figure 1 In this embodiment, the portion of the display signal trace 200 outside the control chip 1000 and the second portion 320 extend in the same direction.

[0044] It is understandable that the display signal traces 200 and the second part 320, located outside the control chip 1000, both extend along the first direction a. This helps to reduce the space occupied by the traces.

[0045] In some embodiments, the display signal trace 200 is used to output the GIP signal, and the first touch signal trace 300 is used to output the TP signal.

[0046] Please refer to the embodiments described in this application. Figure 1 In this embodiment, the first side 110 and the second side 120 are two adjacent sides on the active surface 100 of the control chip 1000. This allows other electrical connection contacts to be provided on the other sides of the active surface 100 of the control chip 1000.

[0047] In some embodiments, the second side 120 may also be the side opposite to the first side 110.

[0048] Please refer to the embodiments described in this application. Figure 1 In this embodiment, the second side 120 is the side of the first side 110 adjacent to the side closest to the display signal trace 200. It can be understood that, as... Figure 1 As shown, a portion of the display signal traces 200 located outside the control chip 1000 extends in the first direction a, and the second side 120 is the left side of the active surface 100 of the control chip 1000. The second side 120 is located closer to the portion of the display signal traces 200 located outside the control chip 1000.

[0049] In some embodiments of this application, the first side 110 is the output side of the active surface 100 of the control chip 1000. It is understood that the signal output contacts of the active surface 100 of the control chip 1000 are all located on the output side.

[0050] Please refer to the embodiments described in this application. Figure 1 In this embodiment, the active surface 100 also has a third side 130, which is opposite to and spaced apart from the first side 110. The third side 130 is the input side of the active surface 100 of the control chip 1000. A routing area 140 for the first touch signal routing line 300 in the active surface 100 is defined between the first side 110 and the third side 130.

[0051] It is understandable that the third side 130 is the input side of the control chip 1000, and signals such as power signals, control signals, and data signals can enter the control chip 1000 through the third side 130. The first touch signal trace 300 is routed in the trace area 140 formed between the first side 110 and the third side 130, which helps to improve the space utilization within the display panel.

[0052] In some embodiments of this application, please refer to Figure 4 , Figure 4 A schematic diagram of the structure of the touch display panel provided in this embodiment is shown. The touch display panel of this embodiment further includes a second touch signal trace 400, one end of which is electrically connected to the end of the first touch signal trace 300 away from the control chip 1000; the second touch signal trace 400 overlaps with the projection portion of the display signal trace 200 on the touch display panel, and is located in the overlapping area (e.g., ...). Figure 4 A shielding layer is provided between the second touch signal trace 400 (the shaded area is the overlapping area) and the display signal trace 200.

[0053] It is understood that the touch signal is output by the control chip 1000 and then transmitted to the touch signal actuator via the first touch signal trace 300 and the second touch signal trace 400. Since the second touch signal trace 400 needs to continue transmitting the touch signal, it is unavoidable that the second touch signal trace 400 overlaps with the display signal trace 200. In some embodiments of this application, a shielding layer is provided between the second touch signal trace 400 and the display signal trace 200 located in the overlapping area. The shielding layer can shield the signal coupling between the second touch signal trace 400 and the display signal trace 200, thereby improving the accuracy of the touch signal and the display signal.

[0054] In some embodiments of this application, the shielding layer is the negative voltage signal layer in the touch display panel. The negative voltage signal layer can be the ELVSS signal trace layer.

[0055] Understandably, the primary function of a shielding layer is to isolate and block electromagnetic fields to reduce interference between different signal traces. When a negative voltage signal layer is used as a shielding layer, it not only provides a physical barrier but also further reduces electromagnetic interference by maintaining a stable potential difference.

[0056] Please refer to the embodiments described in this application. Figure 4 In this embodiment, the second touch signal trace 400 includes a first sub-signal trace 410 and a second sub-signal trace 420. One end of the first sub-signal trace 410 is electrically connected to the end of the first touch signal trace 300 away from the control chip 1000, and the other end of the first sub-signal trace 410 is electrically connected to the display screen of the touch display panel. One end of the second sub-signal trace 420 is connected to the connection point between the first sub-signal trace 410 and the first touch signal trace 300, and the other end of the second sub-signal trace 420 is provided with a signal test contact 500.

[0057] Understandably, the primary function of the first sub-signal trace 410 is to transmit touch signals to the display screen or touch sensor array to enable touch detection and response. The primary function of the second sub-signal trace 420 is to provide a signal test contact 500. This contact can be used to test and calibrate the touch signals during manufacturing or product maintenance to ensure the proper functioning of the touch display panel.

[0058] In some embodiments of this application, the circuit board includes at least one conductive layer, and the first portion 310 is disposed within the at least one conductive layer.

[0059] It is understood that the first touch signal trace 300 can be disposed in the M1 layer, which is the first layer of the horizontal metal interconnects on the active surface 100 used to realize circuit connections. In a touch display panel, if the signal line is directly exposed to air or comes into contact with moisture, it is easily corroded, leading to a decrease in signal transmission quality or even failure. In this embodiment, the first touch signal trace 300 is disposed within a conductive layer, which helps to reduce the corrosion of the first touch signal line due to moisture intrusion.

[0060] In some embodiments of this application, the circuit board includes at least two conductive layers, with a first portion 310 alternately disposed within the at least two conductive layers.

[0061] Understandably, the first touch signal trace 300 can be alternately arranged in layers M1 and M2. Layer M2 is also a layer of horizontal metal interconnects used inside the control chip 1000 to realize circuit connections, and it is usually located on one side of layer M1. Layers M1 and M2 are connected through vertical vias. The first touch signal trace 300, which is alternately arranged in different layers, can avoid other signal traces in layers M1 and M2, thereby improving the reliability of the touch signal.

[0062] In some embodiments, the first touch signal trace 300 is disposed in the same conductive layer as the output and input of the control signal.

[0063] Furthermore, in order to better implement the display panel in any of the above embodiments, this application also provides a display device, including the above-described display panel, based on the above-described display panel.

[0064] In some embodiments, the display device may be a mobile phone, tablet, desktop computer, laptop computer, wearable device, automotive screen, sensor device, etc.

[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0066] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0067] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0068] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0069] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A touch display panel, characterized in that, include: A control chip having an active surface, the active surface having a first side and a second side, the first side being provided with display signal contacts and touch signal contacts; A circuit board is disposed on the side of the control chip having an active surface; The display signal trace is electrically connected to the display signal contact, and the display signal trace extends out of the control chip along the first side; A first touch signal trace is electrically connected to the touch signal contact. The first touch signal trace has a first portion that overlaps with the projection of the active surface on the circuit board, and a second portion that extends beyond the projection of the active surface on the circuit board. The first portion is disposed between the projection of the first side on the circuit board and the projection of the second side on the circuit board.

2. The touch display panel according to claim 1, characterized in that, The portion of the display signal trace located outside the control chip extends in the same direction as the second portion.

3. The touch display panel according to claim 2, characterized in that, The first side and the second side are two adjacent sides on the active surface.

4. The touch display panel according to claim 3, characterized in that, The second side is the side of the two adjacent sides of the first side that is closer to the display signal trace.

5. The touch display panel according to claim 3, characterized in that, The first side is the output side of the active surface.

6. The touch display panel according to claim 5, characterized in that, The active surface also has a third side, which is opposite to and spaced apart from the first side, and the third side is the input side of the active surface; A routing area for the first touch signal to be routed within the active surface is defined between the first side and the third side.

7. The touch display panel according to claim 1, characterized in that, The touch display panel further includes a second touch signal trace, one end of which is electrically connected to the end of the first touch signal trace that is away from the control chip. The second touch signal trace overlaps with the projection portion of the display signal trace on the touch display panel, and a shielding layer is provided between the second touch signal trace and the display signal trace located in the overlapping area.

8. The touch display panel according to claim 7, characterized in that, The shielding layer is the negative voltage signal layer in the touch display panel.

9. The touch display panel according to claim 7, characterized in that, The second touch signal trace includes a first sub-signal trace and a second sub-signal trace. One end of the first sub-signal trace is electrically connected to the end of the first touch signal trace away from the control chip, and the other end of the first sub-signal trace is electrically connected to the display screen of the touch display panel. One end of the second sub-signal trace is connected to the connection point between the first sub-signal trace and the first touch signal trace, and the other end of the second sub-signal trace is provided with a signal test contact.

10. The touch display panel according to any one of claims 1 to 9, characterized in that, The circuit board includes at least one conductive layer, and the first portion is disposed within the at least one conductive layer; And / or, the circuit board includes at least two conductive layers, with the first portion alternately disposed within the at least two conductive layers.

11. A display device, characterized in that, Includes the touch display panel as described in any one of claims 1 to 10.

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