Touch key method and corresponding surface pressure touch panel device

Abstract

The invention discloses a key touch control method, which comprises position identification and key trigger starting, and the position identification comprises the following steps: A, arranging two or three pressure sensors on a touch control panel according to the arrangement of keys; b, the touch panel bears pressing force of a finger F at the pressing point, all the pressure sensors bear the action of pressure component force, and all the pressure component force is solved according to stress balance and moment balance of the pressing point; c, each pressure sensor converts the pressure component into a voltage signal and outputs the voltage signal; d, the chip reads the voltage signals of the pressure sensors and calculates the ratio of the two voltage signals; and E, identifying and judging the position of the pressing point according to the ratio of the voltage signals obtained in the step D. According to the invention, a touch sensor is omitted, and the advantages of low cost, simple structure and convenient assembly are achieved. The invention also provides a corresponding surface pressure touch panel device.

Description

Technical Field

[0001] This invention relates to a touch button method and a corresponding surface pressure touch panel device. Background Technology

[0002] Typical automotive touch buttons require touch sensors, such as capacitive touch films, to detect the location of a finger press. To prevent accidental presses, touch buttons generally need to be set to trigger a specific pressure value. A common design uses a touch sensor and a pressure sensor together; the touch sensor detects the location of the finger press, and the pressure sensor detects the pressure applied. The button is triggered only when both sensors meet their respective thresholds.

[0003] Chinese Patent 201811004149.1 discloses an interaction method and an in-vehicle display device. The interaction method includes: detecting user contact on a touchscreen, generating contact information, and obtaining the user's contact position based on the contact information; determining the relative positional relationship between the contact position and a touch button on the touchscreen; and displaying the touch button on a head-up display when the contact position is within the triggerable area of ​​a touch button on the touchscreen. Each touch button corresponds to a triggerable area, the triggerable areas of different touch buttons do not overlap, and user operations within the triggerable area can trigger the function corresponding to the touch button.

[0004] Chinese Patent 201822023156.8 discloses a control system for an in-vehicle touchscreen, including a capacitive sensor and a microprocessor. The microprocessor detects finger touch signals on the touchscreen based on the capacitive sensor. A pressure sensor is integrated on the in-vehicle touchscreen to detect pressure signals on the touchscreen and transmit the pressure data to the microprocessor. The microprocessor is connected to a micro vibration module, which drives the touchscreen to provide vibration feedback signals.

[0005] Chinese Patent 202010084006.7 discloses a local pressure touch and feedback system, which includes a human-machine interface. The human-machine interface is divided into at least one local area module. The local area module is used to independently realize the touch acquisition of the operator's touch signal and independently provide feedback on whether the operation is correct or not.

[0006] The above technical solution uses a touch sensor and a pressure sensor together to achieve the anti-misinterpretation function of touch buttons. It requires a touch sensor, making cost unavoidable. This high cost often limits its application in many scenarios. Furthermore, touch sensors are significantly affected by touch distance; the greater the distance, the lower the sensitivity. Structurally, assembling touch sensors requires additional positioning, fixing, and connection structures, making assembly more complex. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the main objective of this invention is to achieve the same "touch + pressure-based anti-accidental touch" function for automotive smart surfaces using a simpler structure and lower cost. It eliminates the touch sensor and instead uses the ratio of voltage signals output from two or three (or more) pressure sensors to logically calculate and determine the pressure position.

[0008] To achieve the aforementioned main objectives, in one aspect, this invention discloses a touch button method, which includes position recognition and button trigger activation. The position recognition includes the following steps:

[0009] A. Depending on the button layout, set 2 or 3 pressure sensors on the touch panel;

[0010] B. The touch panel is pressed by the finger F at the pressing point, and each pressure sensor is subjected to the pressure component. Based on the force balance and the torque balance at the pressing point, the pressure component is solved.

[0011] C. Each pressure sensor converts its pressure component into a voltage signal output;

[0012] D. The chip reads the voltage signals from each pressure sensor and calculates the ratio of the two voltage signals;

[0013] E. Based on the ratio of the voltage signals obtained in step D, identify and determine the location of the pressing point.

[0014] In this invention, the buttons on the touch panel can be arranged in a single row or in multiple rows (array).

[0015] In this invention, when a finger presses on the touch panel, each pressure sensor receives a pressure value from the finger, which is then converted into a voltage signal. The pressure value received by each pressure sensor differs depending on the location of the finger's press, resulting in different voltage signals, but the theoretical ratio remains constant. Based on this principle, the finger's pressing position can be determined by the pressure ratio (voltage signal ratio) of the pressure sensors.

[0016] The core of this invention is the ratio of the voltage signals from two pressure sensors. By using one or three voltage signal ratios, the position of a pressed button can be determined. Specifically, for a single row of buttons, one voltage signal ratio is sufficient to determine the position of a button because each button has a different voltage signal ratio range. For multiple rows of buttons (array arrangement), three voltage signal ratios are sufficient to determine the position of a button because the three voltage signal ratios are different for each button.

[0017] In this invention, a touch sensor is not used; instead, a pressure sensor performs the same function. The pressing position is determined by the recognition of the pressure sensor ratio through the control software chip program.

[0018] In this instruction manual, "outer side", "outer layer", and "front" refer to the same direction; "inner side", "inner layer", and "back side" refer to the same direction.

[0019] According to another specific embodiment of the present invention, if the buttons are arranged in a row (single axis), two pressure sensors are provided; the two pressure sensors are respectively arranged on both sides of the row of buttons, namely the first sensor and the second sensor, and their pressure components are F1 and F2 (F1, F2 are vectors); the button arrangement direction is set as the X-axis.

[0020] According to another specific embodiment of the present invention, step B includes the following steps:

[0021] B1. According to the principle of force balance, the forces are balanced in the direction of finger pressing, specifically as follows:

[0022] F = F1 + F2 ①;

[0023] B2. The distance from the first sensor to the pressure point is x1, and the distance from the second sensor to the pressure point is x2. According to the torque balance principle, the torque at the pressure point is balanced along the X-axis, specifically as follows:

[0024] F1*x1+F2*x2=0②;

[0025] B3. Based on equations ① and ②, form a system of equations. Since F, x1, and x2 are all known quantities, F1 and F2 can be solved.

[0026] According to another specific embodiment of the present invention, button-triggered activation includes: setting a trigger calibration value ξ1 for the voltage signal U1 of the first sensor, and setting a trigger calibration value ξ1 for the voltage signal U2 of the second sensor.

[0027] 2; If U1≥ξ1 or U2≥ξ2, then press the button to start.

[0028] According to another specific embodiment of the present invention, if the buttons are arranged in an array (e.g., a 3x2 array), then three pressure sensors are provided; the three pressure sensors are arranged in a triangle (preferably the three pressure sensors surround the button array), namely the first sensor, the second sensor, and the third sensor, and their pressure components are F1, F2, and F3 (F1, F2, and F3 are vectors); the directions of the rows and columns in the button array are set as the X-axis and the Y-axis, respectively.

[0029] According to another specific embodiment of the present invention, step B includes the following steps:

[0030] B1. According to the principle of force balance, the forces are balanced in the direction of finger pressing, specifically as follows:

[0031] F = F1 + F2 + F3 ③;

[0032] B2. The distance from the first sensor to the pressing point along the X-axis is x1, the distance from the second sensor to the pressing point along the X-axis is x2, and the distance from the third sensor to the pressing point along the X-axis is x3. According to the principle of torque balance, the torque at the pressing point along the X-axis is balanced, specifically...

[0033] F1*x1+F2*x2+F3*x3=0④;

[0034] B3. The distance from the first sensor to the pressing point along the Y-axis is y1, the distance from the second sensor to the pressing point along the Y-axis is y2, and the distance from the third sensor to the pressing point along the Y-axis is y3. According to the principle of torque balance, the torque at the pressing point along the Y-axis is balanced, specifically...

[0035] F1*y1+F2*y2+F3*y3=0⑤;

[0036] B4. Based on equations ③, ④, and ⑤, form a system of equations. Since F, x1, x2, x3, y1, y2, and y3 are all known quantities, F1, F2, and F3 can be solved.

[0037] According to another specific embodiment of the present invention, button-triggered activation includes: setting a trigger calibration value ξ1 for the voltage signal U1 of the first sensor, and setting a trigger calibration value ξ1 for the voltage signal U2 of the second sensor.

[0038] 2. Set the trigger calibration value ξ3 of the voltage signal U3 of the third sensor; if U1≥ξ1 or U2≥ξ2 or U3≥ξ3, then press the button to trigger the start.

[0039] On the other hand, the present invention provides a surface pressure touch panel device, comprising:

[0040] The touch panel has buttons arranged horizontally and / or vertically, and 2-3 pressure sensors are located on the back of the touch panel;

[0041] The PCBA is located on the back of the touch panel. The pressure sensor is mounted on the PCBA, which also has an MCU chip and LEDs mounted on it.

[0042] The bottom cover is located on the back of the PCBA, and the PCBA is fixedly mounted on the bottom cover.

[0043] Specifically, when there is a row of buttons, there are two pressure sensors, which are respectively located on both sides of the row of buttons;

[0044] When there are multiple rows of buttons, there are 3 pressure sensors, and the 3 pressure sensors are arranged in a triangle.

[0045] Furthermore, the surface pressure touch panel device also includes a light-blocking component. The PCBA, light-blocking component, and bottom cover are assembled into a single assembly, which is installed on the back of the touch panel. The light-blocking component is located between the touch panel and the PCBA. The light-blocking component includes an outer layer of light-blocking cotton and an inner layer of light-blocking plate, with the light-blocking plate contacting the PCBA and the light-blocking cotton contacting the touch panel. The function of this light-blocking component is to separate two adjacent LEDs, blocking light and ensuring that a button is only illuminated by its corresponding LED (preventing it from being illuminated by other LEDs). In addition, the light-blocking cotton also has another function: it is easily deformed by compression, which provides some space for the touch panel to move downwards when pressed.

[0046] Furthermore, on the back of the touch panel, a plastic post is provided at the end corresponding to the pressure sensor, and a pressure silicone sleeve is fitted on the plastic post, so that the pressure sensor contacts its corresponding pressure silicone sleeve.

[0047] When a hand presses on the touch panel, the pressure is transmitted through the structure to the pressure sensor. The pressure sensor converts the pressure into a recognizable voltage signal, which is linearly related to the magnitude of the force. This voltage signal is then sent to the MCU chip to calculate the ratio, identify and judge the signal, and issue corresponding instructions.

[0048] The surface pressure touch panel device of the present invention identifies the press position on the principle as follows: Figure 1 As shown. The touch panel is pressed by a finger F. The pressure components on the first and second sensors are F1 and F2, respectively. According to the principles of force balance and torque balance, F1 + F2 = F; F1*x1 + F2*x2 = 0. A system of equations is formed, and F1 and F2 are solved. The voltage signal of the pressure sensor is directly proportional to the force, i.e., U1 / U2 = F1 / F2 = x2 / x1. The ratio x2 / x1 corresponds to the finger's pressing position, and this correspondence is used to determine the pressing position.

[0049] The present invention has the following beneficial effects:

[0050] Compared with existing technologies, this invention eliminates the touch sensor, offering advantages such as low cost, simple structure, and easy assembly. It uses logical calculations in the control program to identify and judge touch inputs, thus replacing the function of a touch sensor and broadening and deepening the application scenarios of "touch + pressure-based accidental touch prevention."

[0051] To more clearly illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the surface pressure touch panel device in Embodiment 1;

[0053] Figure 2 This is a schematic diagram of the surface pressure touch panel device in Embodiment 1 that identifies the press position;

[0054] Figure 3 This is a schematic diagram of a single-row button touch panel device in Embodiment 1;

[0055] Figure 4 This is a schematic diagram of a multi-row button touch panel device in Embodiment 2. Detailed Implementation

[0056] Many specific details are set forth in the following description in conjunction with embodiments in order to provide a full understanding of the invention. However, it should be understood that the following embodiments and detailed descriptions are for illustrative purposes only and do not limit the scope of protection of the invention.

[0057] Example 1 (Single Row)

[0058] like Figure 1 As shown, the surface pressure touch panel device of this embodiment includes: a touch panel 101, a light-blocking component, a PCBA 106, two pressure sensors (first sensor 109A and second sensor 109B), an MCU chip 107, and a bottom cover 104; the touch panel 101 and PCBA 104 are arranged in parallel, with the touch panel 101 located in front of the PCBA 104; the first sensor 109A, the second sensor 109B, the MCU chip 107, and the LED beads 108 are all mounted on the PCBA 106; the first sensor 109A and the second sensor 109B are respectively located at the left and right ends of the touch panel 101; three buttons are arranged horizontally on the touch panel 101, namely button A, button B, and button C.

[0059] Plastic pillars are provided on the left and right ends of the back of the touch panel 101. Pressure silicone sleeves 105 are fitted on the plastic pillars. The first sensor 109A and the second sensor 109B are both in contact with the pressure silicone sleeves 105.

[0060] The bottom cover 104 is located behind PCBA106 and is set parallel to PCBA106.

[0061] PCBA106, the light-blocking component, and the bottom cover 104 are assembled into a single component, which is mounted on the back of the touch panel 101. The light-blocking component is located between the touch panel 101 and the PCBA106. The light-blocking component includes light-blocking cotton 102 and light-blocking plate 103, wherein the light-blocking plate 102 contacts the PCBA106, and the light-blocking cotton 103 contacts the touch panel 101.

[0062] For any point on the pressing plane, the pressure components F1 and F2 acting on the two pressure sensors can be calculated separately (e.g., Figure 2 As shown in the figure, the two pressure sensors convert the pressure signal into voltage signals U1 and U2, respectively.

[0063] Assuming U1 / U2 = n1, determine the pressing position based on the value of n1.

[0064] The following explains how to solve for n1.

[0065] like Figure 3 As shown, assuming button A is pressed, according to the principle of force balance, we have:

[0066] F = F1 + F2 ①

[0067] According to the principle of torque balance, we have:

[0068] F1*x1 + F2*x2 = 0 ②

[0069] Since F, x1, x2 are known values, F1, F2 are vector values;

[0070] The unknowns F1 and F2 can be calculated by forming a system of equations from equations ① and ②.

[0071] Accordingly, the voltage signal of the first sensor is U1, and the voltage signal of the second sensor is U2.

[0072] The ratio of voltage signals: U1 / U2 = n1.

[0073] The location of the press can be determined by recognizing the data from n1.

[0074] The above is the location identification and judgment.

[0075] The button-triggered start is as follows: Set the voltage signal trigger calibration value ξ1 of the first sensor and the voltage signal trigger calibration value ξ2 of the second sensor; if U1≥ξ1 or U2≥ξ2, then the button-triggered start is activated.

[0076] Example 2 (Multi-row)

[0077] like Figure 4 As shown, the surface pressure touch panel device in this embodiment differs from that in Embodiment 1 in the following ways: 1. The buttons on the touch panel are arranged in an array of multiple rows (e.g., a 3x2 array, namely A, B, C / D, E, F); 2. Three pressure sensors are arranged in each row.

[0078] For any point on the pressing plane, the pressure components F1, F2, and F3 experienced by the pressure sensor can be calculated respectively, and the pressure sensor converts the pressure signal into voltage signals U1, U2, and U3 respectively;

[0079] Assume U1 / U2=n1; U2 / U3=n2; U3 / U1=n3;

[0080] The location of the pressure is determined based on the different values ​​of n1, n2, and n3.

[0081] The following explains the solution method for n1, n2, and n3.

[0082] like Figure 4 As shown, assuming button A is pressed, according to the principle of force balance...

[0083] Then: F = F1 + F2 + F3 ③

[0084] According to the principle of torque balance

[0085] In the X-axis direction, we have:

[0086] F1*x1 + F2*x2 + F3*x3 = 0 ④

[0087] In the Y-axis direction, then:

[0088] F1*y1+ F2*y2+ F3*y3=0 ⑤

[0089] Since F, x1, x2, x3, y1, y2, y3 are known values, and F1, F2, F3 are vector values;

[0090] The unknowns F1, F2, and F3 can be calculated by forming a system of equations from equations ③, ④, and ⑤.

[0091] Accordingly, the voltage signal of the first sensor is U1, the voltage signal of the second sensor is U2, and the voltage signal of the third sensor is U3.

[0092] The ratio of voltage signals:

[0093] U1 / U2=n1

[0094] U2 / U3 = n2;

[0095] U3 / U1 = n3;

[0096] By identifying the data of n1, n2, and n3, the location of the press can be determined.

[0097] The button-triggered start is as follows: Set the voltage signal trigger calibration value ξ1 of the first sensor, set the voltage signal trigger calibration value ξ2 of the second sensor, and set the voltage signal trigger calibration value ξ3 of the third sensor; if U1≥ξ1 or U2≥ξ2 or U3≥ξ3, then the button-triggered start is activated.

[0098] Although the present invention has been described above by way of embodiments, the above embodiments are only used to exemplify possible implementations of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent substitutions or changes made by those skilled in the art in accordance with the present invention should also be covered by the scope of protection defined by the claims of the present invention.

Claims

1. A method for using a touch button, characterized in that, This includes location recognition and button-triggered activation. The location recognition includes the following steps: A. Depending on the button layout, set 2 or 3 pressure sensors on the touch panel; B. The touch panel is pressed by the finger F at the pressing point, and each of the pressure sensors is subjected to the pressure component. The pressure component is solved according to the force balance and the torque balance at the pressing point. C. Each pressure sensor converts its pressure component into a voltage signal output; D. The chip reads the voltage signals from each pressure sensor and calculates the ratio of the two voltage signals; E. Based on the ratio of the voltage signals obtained in step D, identify and determine the location of the pressing point.

2. The touch button method according to claim 1, characterized in that: If the buttons are arranged in a row, two pressure sensors are set; the two pressure sensors are respectively set on both sides of the row of buttons, namely the first sensor and the second sensor, and their pressure components are F1 and F2 respectively; the button arrangement direction is set as the X-axis.

3. The touch button method according to claim 2, characterized in that, Step B includes the following steps: B1. According to the principle of force balance, the forces are balanced in the direction of finger pressing, specifically as follows: F = F1 + F2 ①; B2. The distance from the first sensor to the pressing point is x1, and the distance from the second sensor to the pressing point is x2; according to the torque balance principle, the torque at the pressing point is balanced in the X-axis direction, specifically as follows: F1*x1+F2*x2=0②; B3. Based on equations ① and ②, form a system of equations. Since F, x1, and x2 are all known quantities, F1 and F2 can be solved.

4. The touch button method according to claim 3, characterized in that: The button-triggered start includes: setting the trigger calibration value ξ1 of the voltage signal U1 of the first sensor, and setting the trigger calibration value ξ2 of the voltage signal U2 of the second sensor; if U1≥ξ1 or U2≥ξ2, then the button-triggered start is initiated.

5. The touch button method according to claim 1, characterized in that: If the buttons are arranged in an array, then three pressure sensors are set; the three pressure sensors are arranged in a triangle, namely the first sensor, the second sensor, and the third sensor, and their pressure components are F1, F2, and F3 respectively; the directions of the rows and columns in the button array are set as the X-axis and the Y-axis respectively.

6. The touch button method according to claim 5, characterized in that, Step B includes the following steps: B1. According to the principle of force balance, the forces are balanced in the direction of finger pressing, specifically as follows: F = F1 + F2 + F3 ③; B2. The distance from the first sensor to the pressing point in the X-axis direction is x1, the distance from the second sensor to the pressing point in the X-axis direction is x2, and the distance from the third sensor to the pressing point in the X-axis direction is x3. According to the torque balance principle, the torque at the pressing point in the X-axis direction is balanced, specifically... F1*x1+F2*x2+F3*x3=0④; B3. The distance from the first sensor to the pressing point in the Y-axis direction is y1, the distance from the second sensor to the pressing point in the Y-axis direction is y2, and the distance from the third sensor to the pressing point in the Y-axis direction is y3. According to the torque balance principle, the torque at the pressing point in the Y-axis direction is balanced, specifically... F1*y1+F2*y2+F3*y3=0⑤; B4. Based on equations ③, ④, and ⑤, form a system of equations. Since F, x1, x2, x3, y1, y2, and y3 are all known quantities, F1, F2, and F3 can be solved.

7. The touch button method according to claim 6, characterized in that: The button-triggered start includes: setting the trigger calibration value ξ1 of the voltage signal U1 of the first sensor, setting the trigger calibration value ξ2 of the voltage signal U2 of the second sensor, and setting the trigger calibration value ξ3 of the voltage signal U3 of the third sensor; if U1≥ξ1 or U2≥ξ2 or U3≥ξ3, then the button-triggered start is initiated.

8. A surface pressure touch panel device, characterized in that, include: A touch panel, wherein the touch panel is provided with buttons arranged horizontally and / or vertically, and the back of the touch panel is provided with 2-3 pressure sensors; PCBA, which is located on the back of the touch panel, has the pressure sensor patch on it, and the PCBA also has an MCU chip and LED beads on it. A bottom cover is located on the back of the PCBA, and the PCBA is fixedly mounted on the bottom cover.

9. The surface pressure touch panel device as described in claim 8, characterized in that, When the buttons are in a row, there are two pressure sensors, which are respectively located on both sides of the row of buttons. When there are multiple rows of buttons, there are 3 pressure sensors arranged in a triangle.

10. The surface pressure touch panel device as claimed in claim 9, characterized in that, The device further includes a light-blocking component. The PCBA, the light-blocking component, and the bottom cover are assembled into a single component. The component is mounted on the back of the touch panel, and the light-blocking component is located between the touch panel and the PCBA.

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