Capacitive touch screen scanning method and capacitive touch screen

Abstract

The present invention discloses a scanning method based on a capacitive touch screen, comprising the following scanning steps: S1, a capacitive screen driving electrode sends a driving signal, a receiving electrode receives the driving signal of the driving electrode, S2, a global scanning to obtain a touch area, S3, selecting a driving electrode at the edge of the touch area, selecting a receiving electrode at the edge of the touch area, S4, the selected driving electrode sends a driving signal, and the selected receiving electrode receives the driving signal. The present invention uses a global scanning and a local scanning alternately scanning method to obtain a touch area through a global scanning, select a driving electrode at the edge of the touch area to send a driving signal, and then receive the driving signal through the receiving electrode, and perform a local scanning to determine the touch area range. The local scanning area is smaller, thereby shortening the scanning time, facilitating and quickly scanning to the touch point, making the touch reaction speed faster, the touch sensitivity higher, and improving the use experience of the capacitive touch screen.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitive touch screens, and in particular to a capacitive touch screen scanning method and a capacitive touch screen. Background Art

[0002] Capacitive touch screen technology uses the current induction of the human body to work. The capacitive touch screen is a four-layer composite glass screen. The inner surface and interlayer of the glass screen are coated with a layer of ITO. The outermost layer is a thin layer of silica glass protective layer. The interlayer ITO coating is used as the working surface. Four electrodes are drawn out from the four corners. The inner layer ITO is a shielding layer to ensure a good working environment. When the finger touches the metal layer, due to the human body electric field, the user and the touch screen surface form a coupling capacitor. The finger absorbs a very small current from the contact point. This current flows out from the electrodes on the four corners of the touch screen respectively, and the current flowing through these four electrodes is proportional to the distance from the finger to the four corners. The controller obtains the position of the touch point through precise calculation;

[0003] However, the capacitive touch screen needs to scan the touch point multiple times to determine the position, which not only causes great loss to the touch screen, but also takes a long time to scan and has low scanning efficiency for the touch point, which is not conducive to improving the user experience of the touch screen. Summary of the invention

[0004] The present invention provides a capacitive touch screen scanning method and a capacitive touch screen, which can effectively solve the problem proposed in the above background technology that the capacitive touch screen needs to scan the touch point multiple times to determine the position, which not only causes great loss to the touch screen, but also takes a long time to scan and has low scanning efficiency for the touch point, which is not conducive to improving the user experience of the touch screen.

[0005] To achieve the above object, the present invention provides the following technical solution: a capacitive touch screen scanning method, comprising the following scanning steps:

[0006] S1, the capacitive screen driving electrode sends a driving signal, and the receiving electrode receives the driving signal of the driving electrode;

[0007] S2, global scanning to obtain the touch area;

[0008] S3, selecting a driving electrode at the edge of the touch area, and selecting a receiving electrode at the edge of the touch area;

[0009] S4, the selected driving electrode sends a driving signal, and the selected receiving electrode receives the driving signal;

[0010] S5, local scanning to obtain the touch area range;

[0011] S6, determining whether the selection of the driving electrode and the receiving electrode in the touch area is changed;

[0012] S7, superimposing the touch area range of the local scan after the change with the previous touch area range, and calculating the change distance;

[0013] S8, repeatedly determining the electrode selection change and the touch area range superposition;

[0014] S9. When the touch area cannot be scanned, the scanning ends.

[0015] According to the above technical solution, the driving electrodes are transverse electrodes, denoted as T1, T2, T3...Tx, the receiving electrodes are longitudinal electrodes, denoted as R1, R2, R3...Ry, and the distance between adjacent electrodes is 100-500um.

[0016] According to the above technical solution, the number of the touch areas is recorded as k, where k is a positive integer greater than or equal to 1.

[0017] According to the above technical solution, the frame rates of the global scan and the local scan are both 50-100 frames / s, and the global scan and the local scan are performed alternately.

[0018] According to the above technical solution, there are two driving electrodes at the edge of the touch area, denoted as Tx i1 and Tx i2 , x i1 Less than or equal to x i2 There are two receiving electrodes at the edge of the touch area, denoted as Ry i1 and Ry i2 ,y i1 Less than or equal to y i2 , where i=1.

[0019] According to the above technical solution, S7 and S8 are only executed when it is determined in S6 that the touch area, the driving motor and the receiving electrode have changed. The number of selection changes of the driving electrode and the receiving electrode in the touch area is recorded as j, and j is a positive integer greater than or equal to 1.

[0020] According to the above technical solution, when j is 1, there are still two driving electrodes, denoted by T and denoted by Tx. 21 and Tx 22 , x 21 Less than or equal to x 22 , there are still two receiving electrodes, denoted as Ry 21 and Ry 22 ,y 21 Less than or equal to y 22 ;

[0021] When j is 2, there are still two driving electrodes, denoted by T and denoted by Tx 31 and Tx 32 , x 31 Less than or equal to x32 , there are still two receiving electrodes, denoted as Ry 31 and Ry 32 ,y 31 Less than or equal to y 32 ;

[0022] When j is equal to e, there are still two driving electrodes, denoted by T and denoted by Tx. (e+1)1 and Tx (e+1)2 , x (e+1)1 Less than or equal to x (e+1)2 , there are still two receiving electrodes, denoted as Ry (e+1)1 and Ry (e+1)2 ,y (e+1)1 Less than or equal to y (e+1)2 ;

[0023] According to the above technical solution, the change distance of the j-th change is recorded as d, and the calculation formula of d is:

[0024]

[0025] According to the above technical solution, during the repeated judgment, the touch area range used as the basis for change judgment is the previous touch area range;

[0026] When the touch area cannot be found in the scan, the local scan ends first, and the global scan ends 0.5-1s after the local scan ends.

[0027] According to the above technical solution, the scanning step realizes touch scanning.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] By alternating global scanning and local scanning, the touch area is acquired by global scanning, and the driving electrode at the edge of the touch area is selected to send a driving signal. After receiving the driving signal through the receiving electrode, a local scan is performed to determine the touch area range. The local scanning area is smaller, thereby shortening the scanning time, facilitating and quickly scanning the touch point, making the touch response faster, the touch sensitivity higher, and improving the user experience of the capacitive touch screen;

[0030] In partial scanning, only two driving electrodes transmit driving signals and two receiving electrodes receive driving signals. Combined with full scanning, it reduces power consumption while ensuring full scanning and scanning accuracy, thereby reducing power consumption of capacitive touch screens and improving the performance of capacitive touch screens.

[0031] The continuous change of the touch area on the capacitive touch screen is judged through local scanning, the touch area of ​​the sliding touch is superimposed, and the change distance is calculated according to the selected driving electrode and receiving electrode, so that the capacitive touch screen can make corresponding response display according to the sliding distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0033] In the attached picture:

[0034] Figure 1 is a diagram of specific implementation steps of Example 1 of the present invention;

[0035] Figure 2 is a diagram of specific implementation steps of Example 2 of the present invention;

[0036] Figure 3 is a schematic structural diagram of the touch area of ​​the present invention;

[0037] Figure 4 This is a touch area range superposition effect diagram of the present invention. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0039] Embodiment 1:

[0040] like Figure 1 , 3 -4, the present invention provides a technical solution, a capacitive touch screen scanning method, comprising the following scanning steps:

[0041] S1, the capacitive screen driving electrode sends a driving signal, and the receiving electrode receives the driving signal of the driving electrode;

[0042] S2, global scanning to obtain the touch area;

[0043] S3, selecting a driving electrode at the edge of the touch area, and selecting a receiving electrode at the edge of the touch area;

[0044] S4, the selected driving electrode sends a driving signal, and the selected receiving electrode receives the driving signal;

[0045] S5, local scanning to obtain the touch area range;

[0046] S6, determining whether the selection of the driving electrode and the receiving electrode in the touch area is changed;

[0047] S7, superimposing the touch area range of the local scan after the change with the previous touch area range, and calculating the change distance;

[0048] S8, repeatedly determining the electrode selection change and the touch area range superposition;

[0049] S9. When the touch area cannot be scanned, the scanning ends.

[0050] According to the above technical solution, the driving electrodes are transverse electrodes, denoted as T1, T2, T3...Tx, the receiving electrodes are longitudinal electrodes, denoted as R1, R2, R3...Ry, and the distance between adjacent electrodes is 500um.

[0051] According to the above technical solution, the number of touch areas is recorded as k, where k is a positive integer greater than or equal to 1.

[0052] According to the above technical solution, the frame rates of global scanning and local scanning are both 100 frames / s, and global scanning and local scanning are performed alternately.

[0053] According to the above technical solution, there are two driving electrodes at the edge of the touch area, denoted as Tx i1 and Tx i2 , x i1 Less than or equal to x i2 There are two receiving electrodes at the edge of the touch area, denoted as Ry i1 and Ry i2 ,y i1 Less than or equal to y i2 , where i=1.

[0054] According to the above technical solution, the number of selection changes of the driving electrodes and the receiving electrodes in the touch area is recorded as j, where j is a positive integer greater than or equal to 1.

[0055] According to the above technical solution, when j is 1, there are still two driving electrodes, denoted by T and denoted by Tx. 21 and Tx 22 , x 21 Less than or equal to x 22 , there are still two receiving electrodes, denoted as Ry 21 and Ry 22 ,y 21 Less than or equal to y 22 ;

[0056] When j is 2, there are still two driving electrodes, denoted by T and Tx 31 and Tx 32 , x 31 Less than or equal to x 32 , there are still two receiving electrodes, denoted as Ry 31 and Ry 32 ,y 31 Less than or equal to y 32 ;

[0057] When j is equal to e, there are still two driving electrodes, denoted by T and Tx(e+1)1 and Tx (e+1)2 , x (e+1)1 Less than or equal to x (e+1)2 , there are still two receiving electrodes, denoted as Ry (e+1)1 and Ry (e+1)2 ,y (e+1)1 Less than or equal to y (e+1)2 ;

[0058] According to the above technical solution, the change distance of the jth change is recorded as d, and the calculation formula of d is:

[0059]

[0060] According to the above technical solution, when the judgment is repeated, the touch area range used as the basis for the change judgment is the previous touch area range;

[0061] When the touch area cannot be found in the scan, the local scan ends first, and the global scan ends 0.5-1s after the local scan ends.

[0062] According to the above technical solution, touch scanning is realized.

[0063] Embodiment 2:

[0064] like Figure 2-3 As shown, the present invention provides a technical solution, a capacitive touch screen scanning method, comprising the following scanning steps:

[0065] S1, the capacitive screen driving electrode sends a driving signal, and the receiving electrode receives the driving signal of the driving electrode;

[0066] S2, global scanning to obtain the touch area;

[0067] S3, selecting a driving electrode at the edge of the touch area, and selecting a receiving electrode at the edge of the touch area;

[0068] S4, the selected driving electrode sends a driving signal, and the selected receiving electrode receives the driving signal;

[0069] S5, local scanning to obtain the touch area range;

[0070] S6, determining that the selection of the driving electrode and the receiving electrode in the touch area is unchanged;

[0071] S9. When the touch area cannot be scanned, the scanning ends.

[0072] According to the above technical solution, the driving electrodes are transverse electrodes, denoted as T1, T2, T3...Tx, the receiving electrodes are longitudinal electrodes, denoted as R1, R2, R3...Ry, and the distance between adjacent electrodes is 500um.

[0073] According to the above technical solution, the number of touch areas is recorded as k, where k is a positive integer greater than or equal to 1.

[0074] According to the above technical solution, the frame rates of global scanning and local scanning are both 100 frames / s, and global scanning and local scanning are performed alternately.

[0075] According to the above technical solution, there are two driving electrodes at the edge of the touch area, denoted as Tx i1 and Tx i2 , x i1 Less than or equal to x i2 There are two receiving electrodes at the edge of the touch area, denoted as Ry i1 and Ry i2 ,y i1 Less than or equal to y i2 , where i=1.

[0076] According to the above technical solution, after the touch area cannot be found in the scan, the local scan is terminated first, and the global scan is terminated 0.5-1s after the local scan is terminated.

[0077] According to the above technical solution, touch scanning is realized.

[0078] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A capacitive touch screen scanning method, characterized in that: The scanning steps include the following: S1, the capacitive screen driving electrode sends a driving signal, and the receiving electrode receives the driving signal of the driving electrode; S2, global scanning to obtain the touch area; S3, selecting a driving electrode at the edge of the touch area, and selecting a receiving electrode at the edge of the touch area; S4, the selected driving electrode sends a driving signal, and the selected receiving electrode receives the driving signal; S5, local scanning to obtain the touch area range; S6, determining whether the selection of the driving electrode and the receiving electrode in the touch area is changed; S7, superimposing the touch area range of the local scan after the change with the previous touch area range, and calculating the change distance; S8, repeatedly determining the electrode selection change and the touch area range superposition; S9, when the touch area cannot be scanned, the scanning ends; The driving electrodes are transverse electrodes, denoted as T1, T2, T3 ... Tx, and the receiving electrodes are longitudinal electrodes, denoted as R1, R2, R3 ... Ry, and the distance between adjacent electrodes is 100-500um; There are two driving electrodes at the edge of the touch area, denoted as Tx i1 and Tx i2 There are two receiving electrodes at the edge of the touch area, denoted as Ry i1 and Ry i2 , where i = 1; S7 and S8 are executed only when it is determined in S6 that the touch area, the driving electrode and the receiving electrode have changed, and the number of selection changes of the driving electrode and the receiving electrode in the touch area is recorded as j, where j is a positive integer greater than or equal to 1; When j is 1, there are still two driving electrodes, denoted as Tx 21 and Tx 22 , there are still two receiving electrodes, denoted as Ry 21 and Ry 22 ; When j is 2, there are still two driving electrodes, denoted as Tx 31 and Tx 32 , there are still two receiving electrodes, denoted as Ry 31 and Ry 32 ; When j is equal to e, there are still two driving electrodes, denoted as TX (e+1)1 and Tx (e+1)2 , there are still two receiving electrodes, denoted as Ry (e+1)1 and Ry (e+1)2 ; The change distance of the jth change is recorded as d, and the calculation formula of d is: Among them, Tx (j+1)2 is the driving electrode in the touch area of ​​the jth change; Tx 12 A driving electrode for the edge of the touch area; R (j+1)1 is the receiving electrode in the touch area of ​​the jth change; R 11 Receive electrodes at the edge of the touch area.

2. A capacitive touch screen scanning method according to claim 1, characterized in that: The number of the touch areas is denoted as k, where k is a positive integer greater than or equal to 1.

3. The capacitive touch screen scanning method according to claim 1, characterized in that: The frame rates of the global scan and the local scan are both 50-100 frames / s, and the global scan and the local scan are performed alternately.

4. The capacitive touch screen scanning method according to claim 1, characterized in that: During the repeated judgment, the touch area range used as the basis for the change judgment is the previous touch area range; When the touch area cannot be found in the scan, the local scan ends first, and the global scan ends 0.5-1s after the local scan ends.

5. A capacitive touch screen, characterized in that: Touch scanning is achieved according to the scanning method according to any one of claims 1 to 4.

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