Capacitive touch screen and method of designing the same

Abstract

The present invention provides a design method for a capacitive touch screen, comprising the following steps: determining the structure and driving mode of the capacitive touch screen; simulating the capacitive touch screen to obtain a first relationship between a mutual capacitance change ratio and a gap value; determining a maximum mutual capacitance change ratio and a corresponding gap value based on the first relationship; simulating the capacitive touch screen based on the assumption that all gap values ​​in the capacitive touch screen are equal to each other to obtain a relationship between an initial sensing amount and a sensing channel number; obtaining a minimum initial sensing amount and a corresponding sensing channel number based on the driving mode; obtaining a second relationship between a gap value and a sensing channel number based on a signal amount equal to the product of the initial sensing amount and the mutual capacitance change ratio, and a signal amount equal to the product of the maximum mutual capacitance change ratio and the minimum initial sensing amount; and calculating gap values ​​for different sensing channel numbers based on the second relationship. The above-mentioned design method ensures that the sensing amounts at different positions of the sensing channel are consistent, thereby reducing algorithm complexity and improving computational efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of capacitive touch screen, in particular to a capacitive touch screen and a design method thereof. BACKGROUND

[0002] Touch control is the most simple and convenient human-computer interaction method at present, and touch screen is increasingly applied to various electronic products. Capacitive touch screen has become the mainstream touch screen technology due to its long service life, high light transmittance and support for multi-point touch control. Capacitive touch screen includes self-capacitance touch screen and mutual-capacitance touch screen. Mutual-capacitance touch screen includes a driving electrode layer (T x ) and a sensing electrode layer (R x ) arranged oppositely, the driving electrode layer is used to emit signals outward, and the sensing electrode layer is used to receive signals emitted by the driving electrode layer. Since display screen and air can absorb part of the signals, the signal receiving amount of the sensing electrode layer is less than the signal emitting amount of the driving electrode layer. In the signals received by the sensing electrode layer, part of the signals is absorbed by air and the cover plate located on the touch surface and cannot be changed by the touch object, and the other part of the signals can be changed by the touch object; the data change value after being touched in the signal amount that can be changed by the touch object is the sensing amount.

[0003] The end of the driving channel is a driving input end, and the driving channel causes loss to the input signal intensity, so that the signal intensity at a position far from the driving input end is lower, thereby causing the signal intensity emitted to the outside by different positions of the driving channel to have obvious differences, and further causing the sensing amount received by different positions of the sensing electrode layer to be different, which increases the complexity of the algorithm for calculating the touch position coordinates and reduces the calculation efficiency. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is how to improve the calculation efficiency of the touch position coordinates, thereby providing a capacitive touch screen and a design method thereof.

[0005] The application provides a design method of a capacitive touch screen, the capacitive touch screen comprising a driving electrode layer and a sensing electrode layer arranged oppositely, the driving electrode layer comprising driving channels arranged in sequence and spaced from each other, the sensing electrode layer comprising sensing channels arranged in sequence and spaced from each other, the extension direction of the driving channels being perpendicular to the extension direction of the sensing channels, the driving channels having a plurality of driving electrode blocks and driving connection sections connecting adjacent driving electrode blocks, the sensing channels having a plurality of sensing electrode blocks and sensing connection sections connecting adjacent sensing electrode blocks, the orthographic projection of the driving electrode layer on the sensing electrode layer being located in the area surrounded by the plurality of sensing electrode blocks, and the orthographic projection of the sensing electrode layer on the driving electrode layer being located in the area surrounded by the plurality of sensing electrode blocks; wherein the distance between a sensing electrode block and the plurality of driving electrode blocks surrounding the sensing electrode block in the orthographic projection of the sensing electrode layer on the driving electrode layer is defined as a gap value, and the ratio of the mutual capacitance change value after touch to the mutual capacitance value before touch is defined as a mutual capacitance change ratio (ΔC / C0) value; the design method of the capacitive touch screen comprises the following steps:

[0006] determining the structure of the capacitive touch screen and the driving mode, the structure of the capacitive touch screen comprising the material, thickness and lamination mode of each functional layer, and the number of sensing channels;

[0007] simulating the capacitive touch screen to obtain a relationship formula one satisfied by the mutual capacitance change ratio value and the gap value;

[0008] determining the maximum mutual capacitance change ratio value and the corresponding gap value according to the relationship formula one;

[0009] based on the fact that the gap values in the capacitive touch screen are all equal, simulating the capacitive touch screen to obtain the relationship between the initial sensing quantity and the sensing channel number, the sensing channel number being obtained by sequentially labeling the sensing channels along the extension direction of the driving channels;

[0010] obtaining the sensing channel number with the minimum initial sensing quantity and the corresponding initial sensing quantity according to the driving mode;

[0011] defining that the product of the initial sensing quantity corresponding to any sensing channel number and the mutual capacitance change ratio value is equal to a signal quantity, and the signal quantity is equal to the product of the maximum mutual capacitance change ratio value and the minimum initial sensing quantity, to obtain a relationship formula two satisfied by the gap value and the sensing channel number;

[0012] calculating the gap values of different sensing channel numbers according to the relationship formula two.

[0013] Optionally, the driving mode is single-side driving, the driving input end is located at one end of the driving channels, and the sensing channel number with the minimum initial sensing quantity is the label of the sensing channel farthest from the driving input end.

[0014] Optionally, the driving mode is double-side driving, the driving input end is located at two ends of the driving channel, and the number of the inductive channel with the minimum initial inductive quantity is half of the number of the inductive channels.

[0015] Optionally, the driving electrode block and the inductive electrode block are both in the shape of a rhombus; or, the driving electrode block and the inductive electrode block are both in the shape of a right-angled triangle.

[0016] The application further provides a capacitive touch screen designed by using the design method of the capacitive touch screen.

[0017] Optionally, the gap value gradually increases from the driving input end to the inductive channel with the minimum initial inductive quantity.

[0018] Optionally, the driving electrode block and the inductive electrode block are both in the shape of a rhombus, the distance between the center axes of the adjacent inductive channels is the same, the size of the inductive electrode block and / or the size of the driving electrode block gradually decreases from the driving input end to the inductive channel with the minimum initial inductive quantity.

[0019] Optionally, the driving electrode block and the inductive electrode block are both in the shape of a right-angled triangle, the driving channel and the inductive channel both have a straight edge, the distance between the straight edges of the adjacent inductive channels is the same, the size of the inductive electrode block and / or the size of the driving electrode block gradually decreases from the driving input end to the inductive channel with the minimum initial inductive quantity.

[0020] The technical scheme of the application has the following advantages:

[0021] The capacitive touch screen and the design method thereof provided by the application utilize the feature that the mutual capacitance change ratio changes with the change of the gap value, correct the initial inductive quantity by using the mutual capacitance change ratio, make the signal quantity changed by the touch object at different positions of the inductive channel a constant by adjusting and controlling the gap value of the inductive channel number, the constant is the product of the maximum mutual capacitance change ratio and the minimum initial inductive quantity, thereby making the inductive quantity at different positions of the inductive channel consistent, and in the process of calculating the touch position coordinates, no additional stretching of the consistency of the overall inductive quantity is needed, the complexity of the algorithm is reduced, the calculation efficiency is improved, meanwhile, the difficulty of calculating the touch position coordinates is reduced, and the accuracy of the calculation result of the touch position coordinates is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the application or the technical scheme in the prior art, the following will briefly introduce the drawings needed to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0023] Figure 1 Design flow chart of the capacitive touch screen provided by the embodiment of the present application;

[0024] Figure 2 For Figure 1 Projection schematic diagram of the drive electrode layer on the sensing electrode layer in the embodiment of the present application;

[0025] Figure 3 For Figure 2 Partial enlarged view of the frame area in the embodiment of the present application;

[0026] Figure 4 For Figure 1 Another partial projection schematic diagram of the drive electrode layer on the sensing electrode layer in the embodiment of the present application;

[0027] Figure 5 Structure schematic diagram of the capacitive touch screen provided by the embodiment of the present application;

[0028] Explanation of reference signs:

[0029] 1-drive electrode layer; 11-drive channel; 111-drive electrode block; 112-drive connecting segment; 11'-drive channel; 111'-drive electrode block; 112'-drive connecting segment; 2-sensing electrode layer; 21-sensing channel; 211-sensing electrode block; 212-sensing connecting segment; 21'-sensing channel; 211'-sensing electrode block; 212'-sensing connecting segment; 3-display screen; 4-first adhesive layer; 5-first base material layer; 6-second adhesive layer; 7-second base material layer; 8-third adhesive layer; 9-top base material. DETAILED DESCRIPTION

[0030] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0031] The capacitive touch screen comprises oppositely arranged drive electrode layer and sensing electrode layer, the drive electrode layer comprises drive channels arranged in sequence and spaced from each other, the sensing electrode layer comprises sensing channels arranged in sequence and spaced from each other, the extension direction of the drive channels is perpendicular to the extension direction of the sensing channels, and the intersection of the drive channels and the sensing channels will form a coupling capacitor; when a finger or other conductor touches the screen body, the coupling of the touch position drive channel and the sensing channel will be affected, thereby affecting the coupling capacitor of the touch position, and the coordinate of the touch position can be obtained by detecting the change of the mutual capacitance value.

[0032] Generally, the drive channel has a plurality of drive electrode blocks and drive connection sections connecting adjacent drive electrode blocks, and the sense channel has a plurality of sense electrode blocks and sense connection sections connecting adjacent sense electrode blocks; the orthographic projection of the drive electrode block on the sense electrode layer is located in the area surrounded by the plurality of sense electrode blocks, and the orthographic projection of the drive connection section on the sense electrode layer intersects with the sense connection section; the orthographic projection of the sense electrode block on the drive electrode layer is located in the area surrounded by the plurality of sense electrode blocks, and the orthographic projection of the sense connection section on the drive electrode layer intersects with the drive connection section; the shape of the drive electrode block is the same as that of the sense electrode block, and any edge of the drive electrode block is parallel to an edge of the sense electrode block. The distance between the sense electrode block and the plurality of drive electrode blocks surrounding the sense electrode block in the orthographic projection of the sense electrode layer on the drive electrode layer is defined as a gap value, and the ratio of the mutual capacitance change value after touch to the mutual capacitance value before touch is defined as a mutual capacitance change ratio (ΔC / C0) value. Generally, the gap values in the capacitive touch screen are consistent.

[0033] However, due to the impedance of the material of the drive channel itself, the drive channel causes loss to the input signal strength, so that the signal strength at the position farther from the drive input end is lower, thereby causing the signal strength emitted to the outside by different positions of the drive channel to have obvious differences, and further causing the received sensing amount of different positions of the sense electrode layer to be different. In the calculation process of the touch position coordinates, additional algorithm is needed to stretch the overall sensing amount consistency, which increases the complexity of the algorithm for calculating the touch position coordinates and reduces the calculation efficiency.

[0034] Referring to Figure 1 The embodiment provides a design method of a capacitive touch screen, comprising the following steps:

[0035] S1, determining the structure of the capacitive touch screen and the drive mode, wherein the structure of the capacitive touch screen comprises the material, thickness and lamination mode of each functional layer, and the number of sense channels;

[0036] S2, simulating the capacitive touch screen determined in step S1 to obtain a relationship formula one between the mutual capacitance change ratio (ΔC / C0) and the gap value (gap);

[0037] S3, determining the maximum mutual capacitance change ratio and the corresponding gap value (gap) according to the relationship formula one obtained in step S2;

[0038] S4, based on the fact that the gap values in the capacitive touch screen are equal, simulating the capacitive touch screen determined in step S1 to obtain the relationship between the initial sensing amount and the sense channel number, wherein the sense channel number is obtained by sequentially labeling the sense channels along the extension direction of the drive channel;

[0039] S5, obtaining the inductive channel number with the minimum initial inductive quantity and the corresponding initial inductive quantity according to the driving mode;

[0040] S6, defining the product of the maximum mutual capacity change ratio obtained in step S3 and the minimum initial inductive quantity obtained in step S5 as the signal quantity, i.e. the signal quantity is a certain value, and limiting the product of the initial inductive quantity and the mutual capacity change ratio (ΔC / C0) corresponding to any inductive channel number to be equal to the signal quantity, thereby obtaining a second relationship between the gap value (gap) and the inductive channel number;

[0041] S7, calculating the gap value (gap) of different inductive channel numbers according to the second relationship obtained in step S6.

[0042] The design method of the capacitive touch screen utilizes the characteristic that the mutual capacity change ratio (ΔC / C0) changes with the change of the gap value (gap), corrects the initial inductive quantity by using the mutual capacity change ratio (ΔC / C0), makes the signal quantity changed by the touch object at different positions of the inductive channel to be a constant by regulating the gap value (gap) of different inductive channel numbers, the constant being the product of the maximum mutual capacity change ratio and the minimum initial inductive quantity, thereby making the inductive quantity at different positions of the inductive channel consistent, reducing the complexity of the algorithm and improving the calculation efficiency without additional stretching of the consistency of the overall inductive quantity in the calculation process of the touch position coordinates; meanwhile, the difficulty of calculating the touch position coordinates is reduced, which is conducive to improving the accuracy of the calculation result of the touch position coordinates.

[0043] In step S1, each functional layer includes an inductive electrode layer, a driving electrode layer, an adhesive layer and a substrate layer; after the material of each functional layer is determined, the relative dielectric constant and the conductivity of each functional layer are determined accordingly; the lamination mode refers to the lamination order of the above-mentioned functional layers.

[0044] In step S2, when simulating the capacitive touch screen, first, a 3D model of the capacitive touch screen is established in a simulation tool; then, the simulation tool is used to simulate the touch surface with and without copper pillars at different gap values (gap), the touch surface is provided with copper pillars to simulate touch operation, and the touch surface is not provided with copper pillars to simulate the non-touch condition, the initial capacitance (C0) between the driving channel (Tx) and the sensing channel (Rx) under the non-touch condition and the touch capacitance (C) between the driving channel (Tx) and the sensing channel (Rx) under the touch condition are calculated respectively, and the mutual capacitance change ratio (ΔC / C0) at different gap values (gap) is calculated according to the simulation results, ΔC is the difference between the initial capacitance (C0) and the touch capacitance (C), and ΔC refers to the mutual capacitance change amount; then, a relationship between the mutual capacitance change ratio (ΔC / C0) and the gap value (gap) is obtained according to the mutual capacitance change ratio (ΔC / C0) at different gap values (gap).

[0045] The simulation tool used in steps S2 and S4 includes but is not limited to finite elements.

[0046] In step S5, the driving mode is single-side driving, the driving input end is located at one end of the driving channel, and the number of the sensing channel with the minimum initial sensing amount is the number of the sensing channel farthest from the driving input end; or the driving mode is double-side driving, the driving input end is located at both ends of the driving channel, and the number of the sensing channel with the minimum initial sensing amount is one half of the number of the sensing channels.

[0047] In step S7, the gap value (gap) of different sensing channel numbers can be calculated by substituting the different sensing channel numbers into the relationship formula two obtained in step S6; and the size of the sensing electrode block in each sensing channel and / or the size of the driving electrode block in each driving channel is adjusted according to the calculated gap value (gap).

[0048] Specifically, the gap value (gap) of the sensing channel with the minimum initial sensing amount determined in step S5 is the gap value (gap) with the maximum mutual capacitance change ratio determined in step S3, and the gap value (gap) gradually increases from the driving input end to the sensing channel with the minimum initial sensing amount.

[0049] In the embodiment, the driving electrode block and the sensing electrode block are both rhombic; or the driving electrode block and the sensing electrode block are both right-angled triangular.

[0050] Referring to Figures 2-3The driving electrode block 111 and the sensing electrode block 211 are both in the shape of a rhombus; a driving connecting segment 112 connects the corners of adjacent driving electrode blocks 111, and the driving channel 11 is in the same extension direction as the driving connecting segment 112; a sensing connecting segment 212 connects the corners of adjacent sensing electrode blocks 211, and the sensing channel 21 is in the same extension direction as the sensing connecting segment 212; the orthographic projection of the driving electrode block 111 on the sensing electrode layer is located in the area surrounded by four sensing electrode blocks 211, and the orthographic projection of the sensing electrode block 211 on the driving electrode layer is located in the area surrounded by four driving electrode blocks 111. The gap corresponding to each sensing channel 21 refers to four groups of gaps located on both sides of the sensing channel 21. Specifically, on the basis of the same distance (pitch X) between the central axes of adjacent sensing channels 21, the size of the sensing electrode block 211 and / or the size of the driving electrode block gradually decreases from the driving input end to the sensing channel 21 with the minimum initial sensing amount. It should be understood that Figure 2 The trend of the change of the gap is shown when driving from both sides, Figure 3 is Figure 2 A local enlarged view of the middle square area.

[0051] Referring to Figure 4 The driving electrode block 111' and the sensing electrode block 211' are both in the shape of a right-angled triangle; a driving connecting segment 112' connects the corner of a driving electrode block 111' and the right-angled side of the driving electrode block 111' adjacent to the driving electrode block 111', and the driving channel 11' is in the same extension direction as the driving connecting segment 112'; the driving channel 11' has a straight edge; a sensing connecting segment 212' connects the corner of a sensing electrode block 211' and the right-angled side of the sensing electrode block 211' adjacent to the sensing electrode block 211', and the sensing channel 21' is in the same extension direction as the sensing connecting segment 212'; the sensing channel 21' has a straight edge; the orthographic projection of the driving electrode block 111' on the sensing electrode layer is located in the area surrounded by three sensing electrode blocks 211', and the orthographic projection of the sensing electrode block 211' on the driving electrode layer is located in the area surrounded by three driving electrode blocks 111'; the gap corresponding to each sensing channel 21' refers to three groups of gaps located on both sides of the sensing channel 21'. Specifically, the distance between the straight edges of adjacent sensing channels 21' is the same, and the size of the sensing electrode block 211' and / or the size of the driving electrode block gradually decreases from the driving input end to the sensing channel 21' with the minimum initial sensing amount.

[0052] The embodiment also provides a capacitive touch screen designed by the design method of the capacitive touch screen.

[0053] A specific example is provided below to illustrate the design method of the capacitive touch screen provided by the embodiment.

[0054] The capacitive touch screen adopts GFF structure, see Figure 5 The capacitive touch screen includes a display screen 3, a first adhesive layer 4, a first substrate layer 5, a sensing electrode layer 2, a second adhesive layer 6, a second substrate layer 7, a driving electrode layer 1, a third adhesive layer 8, and a top substrate 9 (cover plate) stacked in sequence from bottom to top. The sensing electrode layer 2 is processed and prepared on the first substrate layer 5, and the driving electrode layer 1 is processed and prepared on the second substrate layer 7. The first adhesive layer 4 is used to bond the display screen 3 and the first substrate layer 5, the second adhesive layer 6 is used to bond the sensing electrode layer 2 and the second substrate layer 7, and the third adhesive layer 8 is used to bond the driving electrode layer 1 to the top substrate 9. The surface of the top substrate 9 facing away from the display screen 3 serves as the user's touch surface. The top substrate 9 is made of 3mm thick glass. The first adhesive layer 4, the second adhesive layer 6, and the third adhesive layer 8 are all made of OCR glue. The thickness of the first adhesive layer is 1mm, and the thickness of the second and third adhesive layers are both 125µm. There are 176 sensing channels, and the sensing electrode blocks and driving electrode blocks are both diamond-shaped. The driving mode is bilateral drive.

[0055] Finite element simulation of the capacitive touch screen above yields the following relationship between the mutual capacitance change ratio (ΔC / C0) and the gap value (gap): y = -0.0362x 4 + 0.1166x 3 - 0.1206x 2 + 0.0853x + 0.1255; where y refers to ΔC / C0; x refers to the gap value, in mm;

[0056] According to the above formula, when the gap value (x) is 1.6 mm, the maximum ΔC / C0 (y max ), y max is 0.19359728;

[0057] The sensing channels are numbered in sequence along the extension direction of the driving channel to obtain sensing channel numbers. The number of the sensing channel with the smallest initial sensing amount is 88.

[0058] Finite element simulation of the capacitive touch screen reveals the relationship between the initial sensing value and the sensing channel number (sensing channel 1 to sensing channel 88): Y = -77.48ln(X) + 3362.1. Here, Y represents the initial sensing value, and X represents the sensing channel number.

[0059] The initial induction value of the 88th induction channel is calculated to be Y min = -77.48ln(88) + 3362.1=3015.196;

[0060] Semaphore A=Y(X)×y(x)=Y min ×y max =3015.196×0.19359728= 583.73374426688, thus obtaining the relationship between the sensing channel number (X) and the gap value (gap);

[0061] Substituting the sensing channel numbers (1-87) into the above formula, we can get the gap value (gap) corresponding to sensing channel No. 1 to sensing channel No. 87. Sensing channel No. 89 to sensing channel No. 176 are set symmetrically with sensing channel No. 1 to sensing channel No. 87. The gap value corresponding to sensing channel No. 1 to sensing channel No. 87 is shown in Table 1:

[0062] Table 1

[0063]

[0064] The driving electrode layer and the sensing electrode layer were designed based on the above calculation results, and a capacitive touch screen was prepared. The signal quantities at different positions of the capacitive touch screen were maintained at approximately 583.73374426688.

[0065] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A method for designing a capacitive touch screen, characterized in that: The capacitive touch screen includes a driving electrode layer and a sensing electrode layer arranged opposite to each other, the driving electrode layer including driving channels arranged in sequence and spaced apart from each other, the sensing electrode layer including sensing channels arranged in sequence and spaced apart from each other, the driving channels extending in a direction perpendicular to the sensing channels extending in a direction perpendicular to the sensing channels, the driving channels including a plurality of driving electrode blocks and a driving connection segment connecting adjacent driving electrode blocks, the sensing channels including a plurality of sensing electrode blocks and a sensing connection segment connecting adjacent sensing electrode blocks, the orthographic projections of the driving electrode blocks on the sensing electrode layer being located within an area enclosed by the plurality of sensing electrode blocks, and the orthographic projections of the sensing electrode blocks on the driving electrode layer being located within an area enclosed by the plurality of sensing electrode blocks; wherein the sensing electrode layer is within the orthographic projection of the driving electrode layer, and the distance between the sensing electrode blocks and the plurality of driving electrode blocks surrounding the sensing electrode blocks is defined as a gap value, and the ratio of a change in mutual capacitance value ΔC after a touch to a mutual capacitance value C0 before the touch is defined as a mutual capacitance change ratio; the design method of the capacitive touch screen includes the following steps: Determine the structure and driving mode of the capacitive touch screen, wherein the structure of the capacitive touch screen includes the material, thickness, and stacking method of each functional layer, as well as the number of sensing channels; Simulating the capacitive touch screen to obtain a first relationship satisfied by the mutual capacitance change ratio and the gap value; Determine the maximum mutual capacitance change ratio and the corresponding gap value according to the relationship 1; Based on the fact that all gap values ​​in the capacitive touch screen are equal, the capacitive touch screen is simulated to obtain a relationship between an initial sensing amount and a sensing channel number, where the sensing channel number is obtained by sequentially numbering the sensing channels along an extension direction of the driving channel; Obtain the sensing channel number with the minimum initial sensing amount and the corresponding initial sensing amount according to the driving mode; Define that the product of the initial induction value and the mutual capacitance change ratio corresponding to any sensing channel number is equal to the signal value, and the signal value is equal to the product of the maximum mutual capacitance change ratio and the minimum initial induction value, and obtain the second relationship satisfied by the gap value and the sensing channel number; The gap values ​​of different sensing channel numbers are calculated according to the second relational expression.

2. The method for designing a capacitive touch screen according to claim 1, wherein: The driving mode is unilateral driving, the driving input end is located at one end of the driving channel, and the number of the sensing channel with the smallest initial sensing amount is the number of the sensing channel farthest from the driving input end.

3. The method for designing a capacitive touch screen according to claim 1, wherein: The driving mode is bilateral driving, the driving input ends are located at both ends of the driving channel, and the number of the sensing channel with the smallest initial sensing amount is half of the number of sensing channels.

4. The method for designing a capacitive touch screen according to any one of claims 1 to 3, wherein: The driving electrode blocks and the sensing electrode blocks are both in the shape of a rhombus; or, the driving electrode blocks and the sensing electrode blocks are both in the shape of a right triangle.

5. A capacitive touch screen, characterized in that: The capacitive touch screen is designed by the design method of any one of claims 1 to 4.

6. The capacitive touch screen according to claim 5, wherein: The gap value gradually increases from the driving input end to the sensing channel with the minimum initial sensing amount.

7. The capacitive touch screen according to claim 6, wherein: The driving electrode blocks and the sensing electrode blocks are both diamond-shaped, and the distances between the central axes of adjacent sensing channels are the same. From the driving input end to the sensing channel with the minimum initial sensing amount, the size of the sensing electrode blocks gradually decreases and / or the size of the driving electrode blocks gradually decreases.

8. The capacitive touch screen according to claim 6, wherein: The driving electrode blocks and the sensing electrode blocks are both right triangles. The driving channels and the sensing channels both have a straight edge. The distances between the straight edges of adjacent sensing channels are the same. From the driving input end to the sensing channel with the minimum initial sensing amount, the size of the sensing electrode blocks gradually decreases and / or the size of the driving electrode blocks gradually decreases.

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