Touch panel with good capacitance data consistency and touch equipment
By adopting step-distributed induction electrode channel wiring in the touch panel, the node capacitance abnormality caused by wiring settings in the prior art is solved, and more uniform and consistent touch capacitor data is achieved, which improves the yield of testing and production.
Patent Information
- Application Number
- CN202421285095.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-05
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-06-05
AI Technical Summary
The wiring settings of the existing touchpad result in abnormal node capacitance, which in turn leads to poor touch marking test results and reduced yield.
The induction electrode channel trace is adopted and distributed on the device layer to avoid excessive overlap between the induction electrode channels and the driving electrode channels, and reduce the generation of coupling capacitors.
It effectively avoids the generation of abnormal capacitance data, ensures the uniformity and consistency of the touch capacitance data on the entire page of the touch panel, and improves the touch marking test effect and yield.
Smart Images
Figure CN222672310U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic touch panels, in particular to a touch panel and a touch control device with good capacitance data consistency. Background Art
[0002] In the traditional double-sided touch panel structure, a plurality of criss-crossing sensing electrode channels and driving electrode channels are arranged on the touch layer. The electrode blocks on each channel are connected to the device layer through conductive vias. The vertically crisscrossed electrode channels can be connected to the corresponding signal pins of the touch chip on the device layer through conductive via leads.
[0003] In order to make the touch panel work effectively, an electrode capacitance sensing array is usually set on the touch layer. The electrode capacitance sensing array consists of multiple crisscrossing sensing electrode channels and driving electrode channels. The node unit where each sensing electrode channel interacts with each driving electrode channel is a node capacitor. The two groups of electrode blocks in each node unit are close to each other to form a mutual capacitance, that is, the two groups of electrodes constitute the two poles of the capacitor. Then, through the conductive vias, the leads are connected to the touch chip on the device layer, and the touch effect can be achieved after the touch panel is powered on.
[0004] In order to make the layout of the touch panel device layer more neat and beautiful, such as Figure 1 As shown, usually, each channel line on the device layer of the touch panel is arranged in parallel over a long distance. However, such a design will cause a large coupling capacitance to be superimposed on the corresponding node capacitance because the sensing electrode channel line on the device layer overlaps too much with the corresponding driving electrode channel on the touch layer. This coupling capacitance will cause abnormal node capacitance, which will in turn lead to poor touch line test results and reduced production test yield.
[0005] In the process of implementing the utility model, the applicant found that there are at least the following problems in the prior art:
[0006] The wiring arrangement of the existing touch panel will cause abnormal node capacitance, which will lead to poor touch line test effect and reduced production test yield. Utility Model Content
[0007] The purpose of the utility model is to provide a touch panel and a touch control device with good capacitance data consistency, so as to solve the technical problem that the wiring arrangement of the existing touch panel in the prior art will lead to abnormal node capacitance, thereby resulting in poor touch line test results and reduced production test yield. The preferred technical solution among the many technical solutions provided by the utility model can produce many technical effects as described below.
[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0009] The utility model provides a touch panel with good capacitance data consistency, comprising a touch layer and a device layer which are stacked; the touch layer is provided with sensing electrode channels and driving electrode channels which are arranged in a criss-cross pattern; the sensing electrode channels and the driving electrode channels are electrically connected to devices on the device layer through conductive vias; the device layer is provided with sensing wirings of the sensing electrode channels and driving wirings of the driving electrode channels; the sensing wirings are distributed in a stepped manner.
[0010] Preferably, the driving electrode channel includes a plurality of driving electrode blocks; and the sensing line overlaps with at most six driving electrode blocks on the same driving electrode channel.
[0011] Preferably, the touch panel has a thickness of 0.3 mm to 0.5 mm.
[0012] Preferably, the driving electrode channel includes a plurality of driving electrode blocks; and the sensing line overlaps with at most 14 driving electrode blocks on the same driving electrode channel.
[0013] Preferably, the touch panel has a thickness of 0.6 mm to 1 mm.
[0014] Preferably, the sensing electrode channels and the driving electrode channels intersect to form an electrode node unit; the electrode node unit includes a sensing electrode block and two driving electrode blocks engaged on both sides of the sensing electrode block.
[0015] Preferably, two driving electrode blocks on one electrode node unit are connected through the conductive via, and the driving electrode blocks on two adjacent electrode node units are connected by rib structures to form a driving electrode channel.
[0016] Preferably, the sensing electrode channel is electrically connected to the touch chip on the device layer through the sensing line passing through the conductive via hole; the driving electrode channel is electrically connected to the touch chip on the device layer through the driving line passing through the conductive via hole.
[0017] A touch control device comprises any of the above touch panels with good capacitance data consistency.
[0018] Preferably, the touch-controlled device includes a laptop computer, a tablet computer, a smart phone, a smart door lock and a touch-controlled watch.
[0019] Implementing one of the above technical solutions of the utility model has the following advantages or beneficial effects:
[0020] The utility model changes the routing of the traditional horizontal parallel sensing electrode channels, sets up stepped sensing electrode channel lines, and arranges them dispersedly on the device layer. The stepped wiring can avoid excessive overlap between the sensing electrode channel lines and the same driving electrode channel on the touch layer, resulting in a smaller coupling capacitance, and the influence on the normally generated touch capacitance can be ignored, thereby avoiding the generation of abnormal capacitance data, thereby ensuring the uniformity and consistency of the touch capacitance data of the entire touch panel. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:
[0022] Figure 1 It is a structural schematic diagram of an existing touch panel;
[0023] Figure 2 This is a schematic diagram of the structure of a touch panel with good capacitance data consistency in the first embodiment of the utility model;
[0024] Figure 3 This is a partial enlarged view of the touch panel a area with good capacitance data consistency in the first embodiment of the utility model;
[0025] Figure 4 This is a partial enlarged view of the touch panel b area with good capacitance data consistency in the first embodiment of the utility model;
[0026] Figure 5 This is a partial enlarged view of the c area of the touch panel with good capacitance data consistency in the first embodiment of the utility model;
[0027] In the figure: 1. Sensing electrode channel; 11. Sensing electrode block; 2. Driving electrode channel; 21. Driving electrode block; 3. Sensing trace; 4. Driving trace; 5. Touch chip; 6. Electrode node unit; 7. Conductive via. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical solutions and advantages of the utility model clearer, the various exemplary embodiments to be described below will refer to the corresponding drawings, which constitute a part of the exemplary embodiments, wherein various exemplary embodiments that may be used to implement the utility model are described. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with the present disclosure. It should be understood that they are only examples of processes, methods, and devices that are consistent with some aspects of the utility model disclosed as detailed in the attached claims, and other embodiments may also be used, or the embodiments listed herein may be modified in structure and function without departing from the scope and essence of the utility model.
[0029] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", etc. indicate the orientation or position relationship based on the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the elements referred to must have a specific orientation, be constructed and operated in a specific orientation. The terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "multiple" means two or more. The terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, an indirect connection through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements. The term "and / or" includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.
[0030] In order to illustrate the technical solution of the present invention, a specific embodiment is provided below, in which only the parts related to the embodiment of the present invention are shown.
[0031] Embodiment 1:
[0032] like Figure 2 As shown, the utility model provides a touch panel with good capacitance data consistency, comprising a touch layer and a device layer stacked, wherein the device layer is located above the touch layer; the touch layer is provided with sensing electrode channels 1 and driving electrode channels 2 arranged in a criss-cross pattern; the sensing electrode channels 1 and the driving electrode channels 2 are electrically connected to the devices on the device layer through conductive vias 7; the device layer is provided with sensing traces 3 of the sensing electrode channels 1 and driving traces 4 of the driving electrode channels 2; the sensing traces 3 are distributed in a stepped manner.
[0033] This embodiment changes the routing of the traditional horizontal parallel sensing electrode channels 1, and sets a stepped sensing electrode channel 1 line, which is dispersedly arranged on the device layer. The stepped wiring can avoid excessive overlap between the sensing electrode channel 1 and the same driving electrode channel 2 on the touch layer, resulting in a smaller coupling capacitance, and the influence on the normally generated touch capacitance can be ignored, thereby avoiding the generation of abnormal capacitance data, thereby ensuring the uniformity and consistency of the touch capacitance data of the entire touch panel.
[0034] As an alternative implementation, Figure 3 As shown, the sensing electrode channel 1 and the driving electrode channel 2 intersect to form an electrode node unit 6; the electrode node unit 6 includes a sensing electrode block 11 and two driving electrode blocks 21 that are engaged on both sides of the sensing electrode block 11. The two driving electrode blocks 21 on one electrode node unit 6 are connected through a conductive via 7, and the driving electrode blocks 21 on two adjacent electrode node units 6 are a connecting rib structure to form a driving electrode channel 2. The sensing electrode blocks 11 on one sensing electrode channel 1 are all connecting rib structures. In this embodiment, the sensing electrode channel 1 is arranged longitudinally on the touch layer, and the driving electrode channel 2 is arranged transversely on the touch layer. The intersection formed by the intersection of the sensing electrode channel 1 and the driving electrode channel 2 is an electrode node unit 6. When a human body clicks or swipes on the touchpad, the sensing electrode block 11 and the driving electrode block 21 in the corresponding electrode node unit 6 can generate normal coupling capacitance, thereby generating touch capacitance data. However, if the line of the sensing electrode channel 1 on the device layer overlaps too much with the same driving electrode channel 2, additional coupling capacitance will be generated, and the coupling capacitance will cause abnormal touch capacitance data.
[0035] As an optional implementation, the sensing electrode channel 1 is electrically connected to the touch chip 5 on the device layer through the sensing line 3 passing through the conductive via 7; the driving electrode channel 2 is electrically connected to the touch chip 5 on the device layer through the driving line 4 passing through the conductive via 7. When the electrode node unit 6 generates normal coupling capacitance, it is transmitted to the touch chip 5 through the sensing line 3 and the driving line 4. The touch chip 5 recognizes it and sends it to the main control, which controls the touch of the touch panel.
[0036] In this embodiment, the sensing traces 3 of the device layer are distributed in a stepped manner, such as Figure 2 As shown, it can be a step-type that climbs upward or a step-type that descends downward. The wiring method is flexible and can be flexibly arranged according to actual conditions. According to the capacitive parallel plate capacitance principle formula: C = ε*S / D, where ε is the dielectric constant of the touch panel, S is the overlapping area of the sensing line 3 and the driving electrode channel 2, and D is the thickness of the touch panel. Therefore, depending on the thickness of the touch panel, the number of overlapping sensing lines 3 and the driving electrode channel 2 that can be tolerated is different.
[0037] As an alternative implementation, the thickness of the touch panel is set to 0.3 mm to 0.5 mm. The driving electrode channel 2 includes a plurality of driving electrode blocks 21; the sensing trace 3 overlaps with at most six driving electrode blocks 21 on the same driving electrode channel 2. Figure 4 As shown in the figure, the leftmost sensing line 3 is located in the gap between the two-zone driving electrode channels 2 and does not overlap with them, while the right sensing electrode line overlaps with the five driving electrode blocks 21 in the driving electrode channel 2. Figure 5 As shown, the sensing line 3 in the figure overlaps with six driving electrode blocks 21 in the driving electrode channel 2, and the sensing electrode lines on other driving electrode channels 2 overlap with no more than six driving electrode blocks 21 of the driving electrode channel 2. Figure 1 , the longest sensing electrode channel 1 has 40 overlapping driving electrode blocks 21 on the same driving electrode channel 2. Since the thickness of the touch panel is selected to be 0.3mm-0.5mm, it is tolerated that the sensing line 3 overlaps with 8 driving electrode blocks 21 on the same driving electrode channel 2, that is, the number of overlapping driving electrode blocks 21 on the sensing line 3 and the same driving electrode channel 2 is less than 8, and the capacitance data generated by the electrode node unit 6 will not be affected. Therefore, the present embodiment can effectively avoid the interference of the coupling capacitance generated by the sensing line 3 and the driving electrode channel 2 on the capacitance data generated by the electrode node unit 6, and no abnormal capacitance data will appear, which well ensures the uniformity and consistency of the capacitance data, which is not only helpful for touch line testing, but also can improve the production test yield.
[0038] As shown in Table 1, the test data results are obtained by testing the capacitance data of the touch panel using the wiring method shown in Table 1. It can be seen from the table that the capacitance data of the overlapping part of the line of the sensing electrode channel 1 and the driving electrode channel 2 on the touch panel in the table is about 14000, while the capacitance data of other areas is about 10000. The capacitance data of the corresponding overlapping part is obviously higher than the data of other areas, which will cause abnormal data, which may cause the touch panel to touch the false alarm point, and it is highly likely that it will not pass the production line test. As shown in Table 2, the capacitance data of the touch panel using the ladder wiring of this embodiment is tested. It can be seen that the capacitance data of the whole board is about 10000, there is no abnormal data, and the capacitance data of the whole board has good uniformity and consistency, which can greatly improve the production test yield.
[0039]
[0040] Table 1 Capacitance data test table of existing touch panels
[0041]
[0042] Table 2 Capacitance test table of the touch panel of this embodiment
[0043] As an optional implementation, the thickness of the touch panel can also be set to 0.6mm to 1mm. The driving electrode channel 2 includes a plurality of driving electrode blocks 21; the sensing line 3 overlaps with a maximum of 14 driving electrode blocks 21 on the same driving electrode channel 2. Due to the thickening of the touch thickness, the number of overlapping driving electrode blocks 21 on the same driving electrode channel 2 by the sensing line 3 can be relaxed. If the thickness of the touch panel is 0.6mm to 1mm, it can tolerate that the sensing line 3 overlaps with 16 driving electrode blocks 21 on the same driving electrode channel 2. As long as the number of overlaps exceeds 16, the consistency of the capacitance data of the entire board can still be guaranteed.
[0044] The embodiment is only a special case and does not indicate that the present invention is implemented in such a way.
[0045] Embodiment 2:
[0046] The difference between the second embodiment and the first embodiment is that: a touch device includes a touch panel with good capacitance data consistency as described in any one of the first embodiments. As an optional implementation, the touch device includes a laptop, a tablet computer, a smart phone, a smart door lock, a touch watch, etc.
[0047] The touch device provided in this embodiment adopts the touch panel with good capacitance data consistency provided in the first embodiment, which can avoid the problem of false touch point alarm caused by abnormal capacitance data of the touch panel of the touch device. The touch panel has good data consistency throughout the entire page and is sensitive to touch, which can greatly improve the user experience.
[0048] The above description is only the preferred embodiment of the present invention. Those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the guidance of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present invention.
Claims
1. A touch panel with good capacitance data consistency, characterized in that: The invention comprises a touch layer and a device layer which are stacked; the touch layer is provided with sensing electrode channels (1) and driving electrode channels (2) which are arranged in a crisscross pattern; the sensing electrode channels (1) and the driving electrode channels (2) are electrically connected to the devices on the device layer through conductive vias (7); the device layer is provided with sensing traces (3) of the sensing electrode channels (1) and driving traces (4) of the driving electrode channels (2); the sensing traces (3) are distributed in a stepped manner.
2. A touch panel with good capacitance data consistency according to claim 1, characterized in that: The driving electrode channel (2) comprises a plurality of driving electrode blocks (21); and the sensing wiring (3) overlaps with at most six driving electrode blocks (21) on the same driving electrode channel (2).
3. A touch panel with good capacitance data consistency according to claim 2, characterized in that: The thickness of the touch panel is 0.3 mm to 0.5 mm.
4. The touch panel with good capacitance data consistency according to claim 1, characterized in that: The driving electrode channel (2) comprises a plurality of driving electrode blocks (21); and the sensing wiring (3) overlaps with at most 14 driving electrode blocks (21) on the same driving electrode channel (2).
5. The touch panel with good capacitance data consistency according to claim 4, characterized in that: The thickness of the touch panel is 0.6 mm to 1 mm.
6. A touch panel with good capacitance data consistency according to claim 2 or 4, characterized in that: The sensing electrode channel (1) and the driving electrode channel (2) intersect to form an electrode node unit (6); the electrode node unit (6) comprises a sensing electrode block (11) and two driving electrode blocks (21) engaged on both sides of the sensing electrode block (11).
7. The touch panel with good capacitance data consistency according to claim 6, characterized in that: Two driving electrode blocks (21) on one electrode node unit (6) are connected via the conductive via (7), and the driving electrode blocks (21) on two adjacent electrode node units (6) are connected by a rib structure to form a driving electrode channel (2).
8. The touch panel with good capacitance data consistency according to claim 1, characterized in that: The sensing electrode channel (1) passes through the conductive via (7) through the sensing wiring (3) and is electrically connected to the touch chip (5) on the device layer; the driving electrode channel (2) passes through the conductive via (7) through the driving wiring (4) and is electrically connected to the touch chip (5) on the device layer.
9. A touch device, characterized in that: A touch panel with good capacitance data consistency comprising any one of claims 1-8.
10. The touch control device according to claim 9, characterized in that: The touch devices include laptops, tablet computers, smart phones, smart door locks and touch watches.