TWI614663B - Touch detection method of capacitive 3d detection module - Google Patents

Abstract

The invention provides a capacitive three-dimensional detecting module detecting method, and provides a capacitive three-dimensional detecting module, wherein the capacitive three-dimensional detecting module comprises a capacitive touch sensor and a piezoelectric pressure sensor And a capacitive three-dimensional controller integrated on the chip, the capacitive touch sensor comprising a plurality of touch units, the piezoelectric pressure sensor comprising at least one pressure sensing unit. The detecting method includes the following steps: S1: detecting the touch signal by using the mutual capacitance method to determine the touch point position; and S2: detecting the pressure signal by using the self-capacitance method to determine the pressing signal. The magnitude of the pressure value; the touch signal and the pressure signal are processed by the capacitive three-dimensional controller.

Description

Capacitive three-dimensional detection module detection method

The invention relates to the field of touch pressure sensing, and in particular to a method for detecting a capacitive three-dimensional detection module.

With the development of touch technology, most of the existing industrial electronic devices and consumer electronic devices use a touch function with touch function, and the touch function of the touch control module receives the finger and the touch. When the pen or the like is operated, the electronic device performs a specific operation by detecting the position of the touch point. For the detection of touch points, whether it is a capacitive screen or a resistive screen, the two-dimensional coordinates of the touch point on the display device are determined by different principles, and a two-dimensional coordinate system is established on the surface of the touch operation surface. (X, Y), the detection of the touch point is equivalent to determining the position of the touch point in the X-axis direction and the position in the Y-axis direction, that is, determining the two-dimensional position of the touch point.

In order to further enrich the touch module with touch function, some touch modules are installed with a pressure sensor to form a three-dimensional detection module, and the pressure sensor includes a plurality of pressure sensing units. The pressure sensing unit at the touch point senses that the pressing force from the perpendicular to the touch module (corresponding to the Z-axis direction) causes a certain deformation to cause the electrical signal at the pressure sensing unit to change. The detection of the electrical number can determine the pressure experienced by the pressure sensing unit. When the touch points of different positions match different pressing values, the corresponding device functions can be set, that is, we can enrich the design from the 3D (3-dimension three-dimensional) angle defined by the touch points (X, Y) and pressure (Z). A three-dimensional detection module with touch detection function and pressure detection function is formed.

However, in today's increasingly thin and light electronic devices, the hardware of the 3D detection module loaded with the pressure sensor is very complicated, and the hardware of the touch sensor and the hardware of the pressure sensor are mostly different. Independent (requires at least two sets of hardware devices, hardware devices include multiple wafers), which has the disadvantages of high cost and high energy consumption. Due to their mutual independence, the overall detection method of the three-dimensional detection module is relatively complicated.

In fact, in the current touch chip for supporting the detection of the touch position, the mutual capacitance detection mode is mainly used, and the prior art mainly uses the impedance detection and the capacitance when the force sensor is subjected to the pressure change. Value change detection is a choice of two detection modes; it is worth noting that if the touch detection uses mutual capacitance, and the pressure change uses the impedance detection method, the overall hardware that will be used (requires multiple wafers The Stern bridge solves signal detection and processing.

For the industry, if the basis of the existing touch chip to solve the signal detection scheme (ie, the capacitance detection type) can be developed, and the pressure sensing signal is also detected in the capacitance type, the existing capacitor can be realized. The detection chip technology directly supports 3D detection applications, which is expected by the industry.

The present invention provides a method for detecting a capacitive three-dimensional detection module in order to overcome the complexity of the hardware complexity of the current three-dimensional detection module (requiring multiple wafers to solve signal processing) and the detection method.

The present invention provides a technical solution for solving the above technical problem: a method for detecting a capacitive three-dimensional detection module, providing a capacitive three-dimensional detection module, the capacitive three-dimensional detection module including a capacitive touch Controlling the sensor and a piezoelectric pressure sensor and a capacitive three-dimensional controller integrated (integrated) on a wafer, the capacitive touch sensor comprising a plurality of touch units, the piezoelectric The pressure sensor includes at least one pressure sensing unit, and the detecting method includes the following steps: S1: detecting a touch signal of the plurality of touch units by using a mutual capacitance method to determine a touch point position; S2: detecting the pressure signal of the at least one pressure sensing unit by using a self-capacitance method to determine the pressing force value, the at least one pressure sensing unit in the step and the touch point position determined in step S1. Correspondingly; the touch signal and the pressure signal are processed by the capacitive three-dimensional controller.

Preferably, the start point and the end point of the detection period of the touch signal are both offset from the start point and the end point of the pressure signal detection period.

Preferably, the at least one pressure sensing unit is disposed corresponding to the positions of the plurality of touch units.

The invention also provides a capacitive three-dimensional detection module, which provides a capacitive three-dimensional detection module, the capacitive three-dimensional detection module comprising a capacitive touch sensor and a piezoelectric type a pressure sensor and a capacitive three-dimensional controller integrated on a chip, the capacitive touch sensor includes a plurality of touch units, and the piezoelectric pressure sensor includes at least one pressure sensing unit. Place The detecting method includes the following steps: T21: detecting a touch signal of the plurality of touch units by using a mutual capacitance method to determine a touch point position; and T22: using the self-capacitance method to the at least one pressure sensing unit The pressure signal is detected to determine the pressing force value; the step T21 and the step T22 are performed independently of each other; and the touch signal and the pressure signal are processed by the capacitive three-dimensional controller.

Preferably, the first pressure sensitive layer is a positive temperature coefficient pressure sensitive layer made of a pressure sensitive material having a positive temperature coefficient, and the second pressure sensitive layer is a negative pressure sensitive material made of a negative temperature coefficient. a temperature coefficient pressure sensing layer, wherein a pressure signal of the pressure sensing unit on the second pressure sensing layer is a temperature compensation target of a pressure signal of the pressure sensing unit on the first pressure sensing layer.

Preferably, the detecting of the touch signal and the detecting of the pressure signal are performed at a timing.

Preferably, the detection of the touch signal and the detection of the pressure signal are performed simultaneously.

Preferably, the start point and the end point of the detection period of the touch signal are both offset from the start point and the end point of the pressure signal detection period.

Preferably, the at least one pressure sensing unit is disposed corresponding to the positions of the plurality of touch units.

Preferably, the piezoelectric pressure sensor comprises at least one flexible substrate layer, and a first pressure sensitive layer and a second pressure sensitive layer are respectively disposed on two sides of the flexible substrate layer, At least one of the pressure sensitive units is disposed on both the pressure sensitive layer and the second pressure sensitive layer.

Preferably, the capacitive three-dimensional controller superimposes the pressure signal of the pressure sensitive unit on the first pressure sensitive layer and the pressure signal of the pressure sensitive unit on the second pressure sensitive layer.

Compared with the prior art, the capacitive three-dimensional detection mode composition provided by the invention has the following advantages:

1. In the detection of the touch point position and the pressing value, the capacitive 3D detecting module can detect the position of the touch point first, and then detect the pressure sensitive unit corresponding to the position of the touch point. According to the pressure value, the capacitive three-dimensional controller can selectively detect all the pressure sensing units without detecting the pressure sensing unit, thereby improving the detection efficiency and reducing the hardware loss.

2. The detection of the touch point position and the detection of the pressing force value can also be performed independently of each other in time series or simultaneously. Since the touch signal and the pressure signal are consistent in the type of signal caused by the touch operation. Therefore, signal interference is easily generated between the two. When the pressure detection and the detection of the touch point are performed in sequence, since the detection timings of the two are staggered, the mutual interference can be reduced to avoid signal misjudgment. Further, the pressure signal is offset from the potential switching point detected by the touch signal, which can further reduce mutual interference between the signals. At the same time, the detection of the pressure signal at the beginning of the touch signal detection (potential cut point) has not started or has ended. Even if an interference signal is generated, they avoid the possibility of mutual interference. At the start of the pressure signal detection and the end point (potential switching point), the detection of the touch signal is in a stable period, so the interference between the two is not large.

3. The piezoelectric pressure sensor comprises at least a flexible substrate layer made of a flexible material, which is sensitive to contact Deformation occurs by the pressure generated by the handle. Providing a first pressure sensitive layer and a second pressure sensitive layer on both sides of the flexible substrate layer, the first pressure sensing unit and the second pressure sensing unit respectively located on the first pressure sensing layer and the second pressure sensing layer One-to-one correspondence of the size positions, when the first pressure sensing unit and the second pressure sensing unit are temperature-compensated reference objects, due to the correspondence of the size positions thereof, the respective noises caused by temperature and other interferences The signals are consistent, and the other noise signals generated during the pressure signal detection process can be better eliminated after being processed by the arithmetic circuit. The pressure detection accuracy is improved; the first pressure sensing unit and the second pressure sensing unit corresponding to the touch point are also superimposed, and the capacitive three-dimensional detecting module detects a stronger and more stable pressure signal. The pressure signal processing of the first pressure sensing layer and the second pressure sensing layer can be set to a temperature compensation mode or a pressure signal superposition method, and has the advantages of flexible design and reasonable structure.

4. The touch unit and the pressure sensing unit are driven by the same common driver, which saves the hardware cost, simplifies the circuit design, improves the integration degree of the capacitive three-dimensional detection module, and reduces the capacitive type to some extent. The thickness and weight of the 3D detection module.

10‧‧‧Capacitive 3D Detection Module

10s‧‧‧pressure sensor

11‧‧‧Upper substrate

12‧‧‧Fitting layer

13‧‧‧Capacitive touch sensor

131‧‧‧First direction touch drive electrode

132‧‧‧Second direction touch receiving electrode

133‧‧‧Insulation block

14‧‧‧Touch panel

15‧‧‧First pressure sensitive layer

151‧‧‧First pressure sensing unit

16‧‧‧Flexible substrate layer

17‧‧‧Second pressure sensitive layer

171‧‧‧Second pressure sensing unit

18‧‧‧Three-dimensional signal processing circuit

180‧‧‧Capacitive 3D controller

181‧‧‧Common drive

183‧‧‧Selection circuit

185‧‧‧ pulse reforming circuit

187‧‧‧Drive pulse processing circuit

189‧‧‧Capacitive 3D processor

20‧‧‧Capacitive 3D Detection Module

20s‧‧‧Piezoelectric pressure sensor

21‧‧‧Upper substrate

22‧‧‧Fitting layer

23‧‧‧Capacitive touch sensor

231‧‧‧First touch electrode layer

232‧‧‧Second touch electrode layer

24‧‧‧First insulation

24, ‧‧‧second insulation

25‧‧‧First pressure sensitive layer

26‧‧‧Flexible substrate layer

27‧‧‧Second pressure sensitive layer

28‧‧‧Signal Processing Circuit

40‧‧‧Capacitive 3D Detection Module

40d‧‧‧Capacitive three-dimensional sensor

40s‧‧‧Piezoelectric pressure sensor

41‧‧‧Upper substrate

42‧‧‧Fitting layer

431‧‧‧First touch electrode layer

4311‧‧‧First direction touch drive electrode

432‧‧‧Second touch electrode layer

45‧‧‧First pressure sensitive layer

46‧‧‧Flexible substrate layer

47‧‧‧Second pressure sensitive layer

48‧‧‧Three-dimensional signal processing circuit

480‧‧‧Capacitive 3D controller

481‧‧‧Common drive

483‧‧‧Selection circuit

485‧‧‧ pulse reforming circuit

487‧‧‧Drive pulse processing circuit

489‧‧‧Capacitive 3D Processor

S0-S4‧‧‧ steps

T0-T4, T21-T22‧‧‧ steps

1 is a schematic view showing a layered structure of a capacitive three-dimensional detecting module according to a first embodiment of the present invention; and FIG. 2 is a plan view showing a planar structure of a touch electrode layer of the capacitive three-dimensional detecting module according to the first embodiment of the present invention; Figure 3 is a schematic enlarged view of the structure at A in Figure 2; 4 is a cross-sectional view of a piezoelectric pressure sensor of a capacitive three-dimensional detecting module according to a first embodiment of the present invention; and FIG. 5 is a signal processing circuit of the capacitive three-dimensional detecting module of the first embodiment of the present invention; FIG. 6A is a timing diagram of touch signal detection and pressure signal detection of the capacitive three-dimensional detection module according to the first embodiment of the present invention; FIG. 6B is a capacitive three-dimensional detection of the first embodiment of the present invention; Example 1 of the touch signal detection and pressure signal detection timing chart of the test module; FIG. 6C is a touch signal detection and pressure signal detection of the capacitive 3D detection module according to the first embodiment of the present invention; FIG. 6D is a third modification of the touch signal detection and pressure signal detection timing diagram of the capacitive three-dimensional detection module according to the first embodiment of the present invention; FIG. 7 is the present invention. FIG. 8 is a schematic view showing a layered structure of a capacitive three-dimensional detecting module according to a third embodiment of the present invention; FIG. 9 is a third embodiment of the present invention; Signal processing circuit of capacitive 3D detection module FIG. 10 is a timing diagram of touch signal detection and pressure signal detection of a capacitive three-dimensional detection module according to a third embodiment of the present invention; and FIG. 11 is a third embodiment of the present invention. FIG. 12 is a schematic diagram showing a deformation structure of a first touch electrode layer of a capacitive three-dimensional detecting module according to a third embodiment of the present invention; 13 is a flowchart of a method for detecting a capacitive 3D detection module according to a fourth embodiment of the present invention; and FIG. 14 is a flowchart of a method for detecting a capacitive 3D detection module according to a fifth embodiment of the present invention; .

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to FIG. 1 , the capacitive three-dimensional detecting module 10 of the first embodiment of the present invention includes a top-to-bottom (in the present invention, position words such as up, down, left, right, top, bottom, etc. are only used to define relative positions on a specified view. The non-absolute position includes a touch panel 14 , a bonding layer 12 and a pressure sensor 10 s. The touch panel 14 is bonded to the piezoelectric pressure sensor 10s through the bonding layer 12 . The capacitive three-dimensional detection module 10 further includes a three-dimensional signal processing circuit 18, and the three-dimensional signal processing circuit 18 is disposed below the piezoelectric pressure sensor 10s, and its position is not limited. The three-dimensional signal processing circuit 18 is electrically connected to the touch panel 14 and the piezoelectric pressure sensor 10s.

The touch panel 14 includes an upper substrate 11 and a capacitive touch sensor 13 . The capacitive touch sensor 13 is disposed on a lower surface of the upper substrate 11 . The upper substrate 11 can be regarded as a touch cover of an electronic device. The so-called cover plate includes a touch operation surface and a component mounting surface, and the touch operation surface thereof It is used for touch operation on a finger or a stylus, and the component mounting surface is used to mount a touch electrode element or a display module.

The flexible substrate layer 16 is a flexible material, preferably having a thickness of less than 500 μm, and more preferably a thickness of less than 200 μm. The material of the flexible substrate layer 16 may be a polymer film such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polymethyl methacrylate. (PMMA) or a film of polycarbonate, a thin glass sheet (for example, 100 μm thick or thinner) or a soda lime glass.

First, in order to clearly illustrate the implementation of the touch panel 14, please refer to FIGS. 2 and 3, the capacitive touch sensor 13 includes a plurality of parallel rows arranged in the first direction (X direction). a first direction touch driving electrode 131 and a plurality of second direction touch receiving electrodes 132 arranged in parallel in the second direction (Y direction), and the plurality of first direction touch driving electrodes 131 arranged in parallel with each other The second direction touch receiving electrodes 132 are arranged in parallel with each other, and an insulating block 133 is disposed at an overlapping area of the two, the insulating block 133 is located in the first direction touch driving electrode 131 and the second direction touch The two are electrically isolated between the receiving electrodes 132. A touch unit (not labeled) is defined between the first direction touch driving electrode 131 and the second direction touch receiving electrode 132, that is, a plurality of touch units are arranged on the lower surface of the upper substrate 11. When the touch unit detects a touch operation from the upper substrate 11 , a corresponding electrical signal is generated and transmitted to the three-dimensional signal processing circuit 18 . In FIG. 2, only four first-direction touch driving electrodes 131 and four second-direction touch receiving electrodes 132 are taken as an example for illustration, in fact, the number No restrictions. The first direction touch driving electrode 131 is complementary to the second position touch receiving electrode 132.

Next, in order to clearly illustrate the embodiment of the piezoelectric pressure sensor 10s, referring to FIG. 1 and FIG. 4, the piezoelectric pressure sensor 10s includes a first pressure sensing layer 15 in order from top to bottom. The flexible substrate layer 16 and a second pressure-sensitive layer 17 are disposed on both sides of the flexible substrate layer 16 and have a flexible substrate layer 16 as a carrier layer. As shown in FIG. 4, at least one first pressure sensitive unit 151 is disposed on the first pressure sensitive layer 15, and at least one second pressure sensitive unit 171 is disposed on the second pressure sensitive layer 17, and the first pressure sensitive unit 151 and the first The shape of the second pressure sensing unit 171 may be one or more of irregular shapes such as a rectangle, a polygon, a circle, and a trapezoid. The first pressure sensitive layer 15 on the upper and lower surfaces of the flexible substrate layer 16 has the same shape and shape as the second pressure sensitive layer 17. The second pressure sensitive layer 17 is provided with a second pressure sensing unit 171, and a plurality of first pressure sensors. The unit 151 has a one-to-one correspondence with the positions of the plurality of second pressure sensing units 171. When the touch operator performs a touch operation on the upper surface of the upper substrate 11, the at least one first pressure sensing unit 151 or the at least one first pressure sensing unit 151 and the at least one second pressure sensing unit are corresponding to the touch point. 171 will be under pressure at the same time.

The first pressure sensing unit 151 and/or the second pressure sensing unit 171 is a pressure reaction caused by deformation, deflection or shear caused by pressure generated by a touch operation, thereby causing at least one pressure change in which electrical properties are changed. As the material, in the present invention, the piezoelectric material is used, and the first pressure sensitive unit 151 and/or the second pressure sensitive unit 171 generate a change in capacitance in response to the pressing action. In other embodiments, the first pressure sensitive unit 151 and/or the second pressure sensitive unit 171 may be one or more of barium titanate or lead zirconate titanate (PZT) and piezoelectric ceramics. It may also be particles of indium tin oxide (ITO), antimony-doped tin oxide (ATO), aluminum-doped zinc oxide (AZO) or other transparent conductive oxide dispersed in an insulating, transparent, deformable matrix.

Please refer to FIG. 5. FIG. 5 is a schematic diagram showing the module structure of the commonly used three-dimensional signal processing circuit 18 of the present invention, but is not limited to this module. It is noted in FIG. 5 that the three-dimensional signal processing circuit 18 includes a capacitive three-dimensional controller 180 integrated on a wafer, both the piezoelectric pressure sensor 10s and the capacitive touch sensor 13 Electrically connected to the capacitive three-dimensional controller 180. The capacitive three-dimensional controller 180 further includes a common driver 181, a drive pulse processing circuit 187, and a capacitive three-dimensional processor 189. The drive pulse processing circuit 187 further includes a selection circuit 183 and a pulse reforming circuit 185. The driving signal provided by the common driver 181 is directly outputted to the capacitive touch sensor 13 to provide a touch scan pulse, and the driving pulse processing circuit 187 shifts the driving signal output by the common driver 181 The pulse width is narrowed, the frequency division is processed, and the like, and the piezoelectric pressure sensor 10s is provided with a pressure scan pulse. The partial circuit within the driving pulse processing circuit 187 may also vary with the detection method, and is not limited thereto. When the user operates on the surface of the upper substrate 11, the piezoelectric pressure sensor 10s and the capacitive touch sensor 13 respectively detect a pressure signal and a touch signal, and the pressure signal and the touch signal are transmitted through the line. To the capacitive three-dimensional processor 189, the capacitive three-dimensional processor 189 processes the pressure signal and the touch signal.

The selection circuit 183 selects all or part of the drive signals from the common driver 181 to be transmitted to the pulse reformer circuit 185, and the drive pulse processing circuit 187 may also only provide the pulse reformer circuit 185/or the selection circuit 183.

The detection method of the corresponding capacitive 3D detection module 10 is as follows: the touch signal and the pressure signal are detected by the touch unit and the pressure sensing unit (the first pressure sensing unit 151 and the second pressure sensing unit 171). In the present invention, the mutual touch mode is used to detect the touch signal, and the self-capacitance method is used to detect the pressure signal.

The mutual-capacitance mode detecting touch signal is specifically defined by: the touch control unit is defined by the first direction touch driving electrode 131 and the second direction touch receiving electrode 132, and has a capacitive effect, that is, the first direction touch A capacitance is formed between the driving electrode 131 and the second direction touch receiving electrode 132. The first direction touch driving electrode 131 is equivalent to the upper plate of the capacitor, and the second direction touch receiving electrode 132 is equivalent to the lower plate of the capacitor. When a user's finger or a stylus pen performs a touch operation on the upper substrate 11, the coupling between the upper and lower plates of the touch unit of the touch point is affected, thereby changing the capacitance between the two plates. . The change in the capacitance forms a touch signal to the capacitive three-dimensional processor 189, and the capacitive three-dimensional processor 189 performs signal processing to confirm the position of the touch point. When the mutual capacitance between the upper and lower plates is detected, the first direction touch driving electrode 131 receives the touch scan pulse from the common driver 181, that is, the first direction touch driving electrode 131 emits an excitation signal, and the second direction touch receiving The electrode 132 receives the touch signal and conducts the touch signal to the capacitive three-dimensional processor 189 through the line.

The self-capacitance mode detecting the pressure signal is specifically: each pressure sensing unit includes at least one pressure driving electrode and one pressure receiving electrode (the same figure is not shown, that is, the two electrodes construct each input pressure unit as a complete circuit input electrode) And the output electrode), the pressure driving electrode receives a pressure scan pulse from the capacitive three-dimensional controller 180, that is, the pressure driving electrode emits an excitation signal, and the pressure receiving electrode receives the pressure signal and conducts the pressure signal to the capacitive three-dimensional processor through the line 189.

Referring to FIG. 6A, It_1 and It_2 respectively represent touch signal detection timings of two different touch units, and the Ifa_1 and Ifa_2 represent pressure signals of two different first pressure sensing units 151 on the first pressure sensitive layer 15. The detection timing, Ifb_1 and Ifb_2 represent the pressure signal detection timing of the two different second pressure sensing units 171 on the second pressure sensing layer 17, the two different first pressure sensing units 151 and the second different pressure sensing The unit 171 corresponds to the position.

It can be seen from FIG. 6A that the detection of the position of the touch point is performed separately from the detection of the magnitude of the pressure value, and the capacitive three-dimensional controller 180 first detects the position of the touch point and determines the touch point. After the position, the corresponding pressure sensing unit at the corresponding touch point position is detected. The touch signal detection of the touch unit and the pressure signal detection of the pressure unit are performed in time series, that is, the touch signal detection and the pressure signal detection of the two are separated in time series without overlapping time periods. The first pressure sensing unit 151 and the detection of the pressure signal of the second pressure sensing unit 171 are simultaneously performed. In the present invention, only a specific touch unit and a pressure sensitive unit are taken as an example for the detection timing. In fact, the number of the touch unit and the pressure sensitive unit are not limited, and the amplitudes of the signals in the figure are the same. It is for convenience of illustration only and is not intended to be limiting.

Please refer to FIG. 6B as a variant of the touch unit and the pressure sensing unit detecting timing. The touch signal detection of the touch unit and the pressure signal detection of the pressure unit are still performed in time series, but the capacitive three-dimensional The controller 180 does not determine the touch position after determining the touch position. The pressure detection and the detection of the touch points are performed independently of each other in time series.

Please refer to FIG. 6C as a variant of the touch unit and the pressure sensitive unit detecting timing. The second embodiment is different from the modified example 1 of FIG. 6B only in that the period of the pressure signal detection is shortened (pulse width is changed). Narrow), so that the detection end point of the adjacent touch signal and the pressure signal is shifted from the starting point, that is, the potential switching point of the two (from "0" to "1" or "1" to "0") Staggered from each other to avoid mutual interference. As a variant embodiment, the period of the pressure signal detection may partially overlap with the period of the touch signal detection, but the potential switching point is misaligned.

Please refer to FIG. 6D as a variant of the touch unit and the pressure sensing unit detecting timing. The pressure detection and the detection of the touch point are performed independently and simultaneously, and the touch position and the pressing force value are detected. The measurement is performed in sequence, and the touch signal detection of the touch unit and the pressure signal detection of the pressure unit are performed simultaneously, that is, the capacitive three-dimensional controller 180 detects the pressure value while detecting the touch. Control point location.

In all embodiments of the invention, the so-called simultaneous order means that the touch signal detection and the pressure signal detection overlap in a working cycle (potential is "1") (excluding the end point overlap), and vice versa. Time division.

The capacitive three-dimensional processor 189 processes the pressure signal on the first pressure sensitive layer 15 and the second pressure sensitive layer 17 of the piezoelectric pressure sensor 10s. The two types of beneficial effects of temperature compensation and pressure signal superposition can be reflected by the selection of materials; it is worth mentioning that in the temperature compensation mode, the first pressure sensing unit 151 on the first pressure sensitive layer 15 respectively The second pressure sensing unit 171 corresponding to the second pressure sensing layer 17 serves as a mutual temperature compensation reference object to eliminate the pressure signal detection error caused by the heat drying signal.

As a preferred embodiment, the first pressure sensing unit 151 and the second pressure sensing unit 171 are made of different materials, specifically, the first pressure sensing layer 15 is made of a piezoelectric material with a positive temperature coefficient. a positive temperature coefficient pressure sensitive layer, the second pressure sensitive layer 17 is a negative temperature coefficient pressure sensitive layer made of a piezoelectric material having a negative temperature coefficient, and the positive temperature coefficient pressure sensitive layer and the negative temperature coefficient pressure sensitive layer are The noise signals generated under the same environmental influence are the same or similar in size, but their polarities are opposite. Therefore, in the pressure signal superposition mode, the first pressure sensitive layer 15 and the second pressure sensitive layer 17 can be made by circuit design. The noise signal is cancelled and the pressure signal is doubled. The combination of the piezoelectric material with positive temperature coefficient and the piezoelectric material with negative temperature coefficient can not only achieve the noise reduction effect brought by the temperature compensation method, but also achieve the pressure signal enhancement effect brought by the pressure signal superposition method.

The capacitive 3D detection module 10 provided by the present invention can be used for multi-touch.

Compared with the prior art, the capacitive three-dimensional detecting module 10 and the detecting method thereof have at least the following advantages:

1. The capacitive 3D detection module 10 can detect the position of the touch point in the detection of the position of the touch point and the pressure value, and then detect the pressure sensitive unit corresponding to the position of the touch point. Pressure value, therefore, at During the detection of the pressure value, the capacitive three-dimensional controller 180 can selectively detect all of the pressure sensing unit without any need, thereby improving the detection efficiency and reducing the hardware loss.

2. The detection of the touch point position and the detection of the pressing force value can also be performed independently of each other in time series or simultaneously. Since the touch signal and the pressure signal are consistent in the type of signal caused by the touch operation. Therefore, signal interference is easily generated between the two. When the pressure detection and the detection of the touch point are performed in sequence, since the detection timings of the two are staggered, the mutual interference can be reduced to avoid signal misjudgment. Further, the pressure signal is offset from the potential switching point detected by the touch signal, which can further reduce mutual interference between the signals. At the same time, the detection of the pressure signal at the beginning of the touch signal detection (potential cut point) has not started or has ended. Even if an interference signal is generated, they avoid the possibility of mutual interference. At the start of the pressure signal detection and the end point (potential switching point), the detection of the touch signal is in a stable period, so the interference between the two is not large.

3. The piezoelectric pressure sensor 10s includes at least one flexible substrate layer 16 made of a flexible material that is sensitive to deformation under pressure generated by the touch point. A first pressure sensitive layer 15 and a second pressure sensitive layer 17 are disposed on both sides of the flexible substrate layer 16, and the first pressure sensing unit 151 is located on the first pressure sensitive layer 15 and the second pressure sensitive layer 17, respectively. Corresponding to the size position of the second pressure sensing unit 171, when the first pressure sensing unit 151 and the second pressure sensing unit 171 are temperature-compensated reference objects, respectively, due to the corresponding position of the size, their respective temperatures, such as temperature And the noise signals brought by other interferences are consistent, and can be better eliminated after being processed by an arithmetic circuit or the like. Other noise signals generated during the pressure signal detection process. The pressure detection accuracy is improved. In addition, the first pressure sensing unit 151 and the second pressure sensing unit 171 corresponding to the touch point are also superimposed, and the capacitive three-dimensional detecting module 10 detects a stronger and more stable pressure signal. The pressure signal processing of the first pressure sensitive layer 15 and the second pressure sensitive layer 17 can be set to both the temperature compensation mode and the pressure signal superposition mode, especially when the first pressure sensitive layer 15 is a positive temperature coefficient. When the second pressure sensitive layer 17 is made of a pressure sensitive material having a negative temperature coefficient, the temperature compensation can be achieved and the pressure signal superimposition effect can be achieved. The overall design has the advantages of flexible design and reasonable structure.

4. The touch unit and the pressure sensing unit are driven by the same common driver 181, which saves the hardware cost, simplifies the circuit design, improves the integration degree of the capacitive three-dimensional detection module 10, and reduces the degree to a certain extent. The thickness and weight of the capacitive three-dimensional detection module 10.

Referring to FIG. 7 , the capacitive three-dimensional detection module 20 of the second embodiment of the present invention is different from the capacitive three-dimensional detection module 10 of the first embodiment only in that: the capacitive three-dimensional detection module 20 The first direction touch driving electrode and the second direction touch receiving electrode (neither shown) are disposed on different bearing layers, and the piezoelectric pressure sensor 20s is not externally positioned on the touch panel ( Not labeled), but embedded in the touch panel. Specifically, the capacitive 3D detection module 20 includes a capacitive touch sensor 23, and the capacitive touch sensor 23 is at least configured by a first touch electrode layer 231 (including a plurality of parallel pitches) The first direction touch driving electrode is defined by a second touch electrode layer 232 (including a plurality of second direction touch receiving electrodes arranged at equal intervals). A piezoelectric pressure sensor is embedded in the touch sensor 23 20s, at this point, the capacitive three-dimensional detection module 20 includes an upper substrate 21, a bonding layer 22, a first touch electrode layer 231, a first insulating layer 24, and a piezoelectric pressure sensor 20s, from top to bottom. The second insulating layer 24', the second touch electrode layer 232 and a signal processing circuit 28. The first insulating layer 24 and the second insulating layer 24 ′ (collectively referred to as insulating layers) serve as bearing layers of the first touch electrode layer 231 and the second touch electrode layer 232 , respectively, and are in the capacitive touch sensor 23 . The piezoelectric pressure sensor 20s is insulated from each other. A touch unit is defined between the first direction touch driving electrode and the second direction touch receiving electrode.

The piezoelectric pressure sensor 20s includes a first pressure sensitive layer 25, a flexible substrate layer 26 and a second pressure sensitive layer 27, and the first pressure sensitive layer 25 and the second pressure sensitive layer 27 are disposed. The flexible substrate layer 26 is used as a carrier layer on both sides of the flexible substrate layer 26. At least one pressure sensing unit is disposed on each of the first pressure sensitive layer 25 and the second pressure sensitive layer 27.

In this embodiment, the structure and operation principle of the three-dimensional signal processing circuit 28, and the detection method and principle between the pressure sensing unit and the touch unit are consistent, that is, the touch sensor 23 detects the position of the touch point by using mutual capacitance. The piezoelectric pressure sensor 20s uses a self-capacitance method to detect the pressing force value.

Referring to FIG. 8 , the capacitive 3D detection module 40 of the third embodiment of the present invention is different from the capacitive 3D detection module 20 of the second embodiment only in that the capacitive 3D detection module 40 is not The insulating layer is disposed in the second embodiment. The capacitive three-dimensional detecting module 40 includes an upper substrate 41, a bonding layer 42, a capacitive three-dimensional sensor 40d and a three-dimensional signal processing circuit 48 in order from top to bottom. The capacitive three-dimensional sensor 40d includes a piezoelectric pressure sensor 40s and a first touch electrode layer 431 and a second touch electrode layer. The capacitive touch sensor (not labeled) defined by 432, the piezoelectric pressure sensor 40s includes a first pressure sensitive layer 45 and a second pressure sensitive layer 47 disposed on opposite sides of the flexible substrate layer 46. It is embedded in the capacitive touch sensor. The first pressure sensitive layer 45 and the second pressure sensitive layer 47 are respectively closely disposed with the first touch electrode layer 431 and the second touch electrode layer 432 , and the first pressure sensitive layer 45 and the second pressure sensitive layer 47 are respectively disposed. At least one pressure sensing unit is disposed thereon. The first touch electrode layer 431 and the second touch electrode layer 432 are respectively provided with a plurality of first-direction touch driving electrodes and second-direction touch receiving electrodes arranged in parallel at equal intervals (not shown). A touch unit is defined between the one-direction touch driving electrode and the second direction touch receiving electrode.

In the present embodiment, the first pressure sensing layer 45 and the second pressure sensing layer 47 that are not patterned serve as the conductive electrode for deriving the pressure signal by using the first touch electrode layer 431 and the second touch electrode layer 432 ( Acting as a pressure signal derivation layer, that is, constructing an input electrode and an output electrode of each of the pressure sensing units as a complete circuit, and the first pressure sensing layer 45 and a second pressure sensing layer 47 are disposed through the first touch electrode The layer 431 and the second touch electrode layer 432 conduct the pressure signal. The capacitive three-dimensional detecting module 40 can detect the position of the touch point and the electrode of the pressure signal, and solves the problem that the pressure signal detection caused by the poor conductivity of the piezoelectric material is difficult.

Referring to FIG. 8 and FIG. 9, the three-dimensional signal processor 48 includes a capacitive three-dimensional controller 480 integrated on a wafer, and the capacitive three-dimensional sensor 40d passes through the same line. A capacitive three-dimensional processor 489 is coupled to the capacitive three-dimensional controller 480. The capacitive three-dimensional controller 480 further includes a common driver 481, one The driving pulse processing circuit 487 (including a selection circuit 483 and a pulse reforming circuit 485), the selection circuit 483 is connected to the common driver 481 and can select all or part of the driving signal outputted by the common driver 481 and output to The pulse reforming circuit 485 can also directly transmit a signal from the common driver 481 to the capacitive three-dimensional sensor 40d if the design of the modified implementation requires the selection circuit 483. The pulse reforming circuit 485 pairs the received signal. The touch scan pulse or the pressure scan pulse may be output to the three-dimensional sensor 40d after the processing such as displacement, frequency division, and pulse width narrowing.

Referring to FIG. 10, It1 and It2 respectively represent touch signal detection timings of two different touch units, and the Ifa_1 and Ifa_2 represent pressure signal detection timings of two different pressure sensing units on the first pressure sensing layer 45. , Ifb_1 and Ifb_2 represent pressure signal detection timings of two different pressure sensing units on the second pressure sensitive layer 47. Two different pressure sensing units on the first pressure sensitive layer 45 are different from those on the second pressure sensitive layer 47. The position of the pressure sensitive unit corresponds. The first pressure sensing layer 45 and the second pressure sensing layer 47 need to conduct the pressure signal through the first touch electrode layer 431 and the second touch electrode layer 432 (acting as a pressure signal deriving layer) disposed closely to each other. Therefore, the detection of the position of the touch point is performed separately from the detection of the magnitude of the pressure value, and the capacitive three-dimensional controller 480 first detects the position of the touch point to determine the position of the touch point, and then detects the position of the touch point. The corresponding pressure sensing unit at the corresponding touch point position.

Referring to FIG. 11 , as a modified embodiment, the first pressure sensitive layer 45 and the second pressure sensitive layer 47 may also be patterned and the first touch electrode layer 431 is closely adhered to the pattern. The pattern of the second touch electrode layer 432 is the same or corresponds to.

In the embodiment, the first touch electrode layer 431 and the second touch electrode layer 432 are preferably fabricated using a metal mesh. The first touch electrode layer 431 is formed by using a metal mesh. A plurality of first-direction touch driving electrodes 4311 (solid line portion in FIG. 12) are arrayed on the electrode layer 431 as shown in FIG.

Compared with the prior art, the first pressure sensing layer 45 and the second pressure sensing layer 47 need to transmit the pressure signal through the first touch electrode layer 431 and the second touch electrode layer 432 disposed in close contact with each other. In the preferred embodiment, the first pressure sensing layer 45 and the second pressure sensing layer 47 do not need to be provided with a pressure driving electrode and a pressure receiving electrode (ie, the touch unit and the pressure sensing unit are in electrical contact, so the touch unit and the touch unit The pressure sensing unit shares the same conductive line electrically connected to the capacitive three-dimensional processor 489), which can greatly reduce the line setting. It also simplifies the production process. The first touch electrode layer 431 and the second touch electrode layer 432 are made of a metal mesh, which has very good conductivity, so that the pressure signal can be reliably derived.

Referring to FIG. 13 , a fourth embodiment of the present invention provides a method for detecting a capacitive three-dimensional detection module. The capacitive three-dimensional detection module can be any of the embodiments disclosed in FIGS. 1 to 12 . A capacitive three-dimensional detection module 10 (refer to the first embodiment of the mechanical components mentioned in the embodiment), the capacitive three-dimensional detection module includes at least one capacitive touch sensor 13 And a piezoelectric pressure sensor 10s, and a capacitive three-dimensional controller 180 integrated on a wafer.

The method for detecting a capacitive 3D detection module includes the following steps:

S0: start;

S1: The capacitive touch sensor 13 detects the touch point position of the plurality of touch units by using a mutual capacitance mode; after the position of the touch point is determined, the method further includes the following steps:

S2: The piezoelectric pressure sensor 10s adopts a capacitive method to detect a pressure signal of the at least one pressure sensing unit to determine a pressing force value; and the piezoelectric pressure sensor 10s detects the touch point. The pressure sensing unit corresponding to the position; the starting point and the ending point of the detecting period of the touch signal are both offset from the starting point and the ending point of the pressure signal detecting period.

S3: The capacitive 3D detection module 10 responds (ie, responds to the action); the capacitive 3D detection module 10 responds to the position of the touch point and presses the pressure value, such as a jump of the display interface. , sliding, etc.

S4: End.

The touch signal generated by the capacitive touch sensor 13 and the pressure signal generated by the piezoelectric pressure sensor 10s are processed by the capacitive three-dimensional controller 180.

Preferably, in step S2, the pressure sensing unit corresponding to the position of the touch point is detected to include at least two pressure sensing units, and the at least two pressure sensing units are respectively located on two sides of the same flexible substrate layer.

Referring to FIG. 14 , a fifth embodiment of the present invention provides a method for detecting a capacitive three-dimensional detection module. The capacitive three-dimensional detection module may be any of the embodiments disclosed in FIGS. 1 to 12 . A capacitive three-dimensional detecting module 10 (refer to the label of the mechanical components mentioned in this embodiment) Embodiment 1) The capacitive 3D detection module includes at least one capacitive touch sensor 13 and a piezoelectric pressure sensor 10s, and a capacitive three-dimensional controller 180.

The method for detecting a capacitive 3D detection module includes the following steps:

T0: start;

T21: The capacitive touch sensor uses the mutual capacitance method to detect the touch signals of the plurality of touch units to determine the position of the touch point;

T22: The piezoelectric pressure sensor uses a self-capacitance method to detect a pressure signal of the at least one pressure sensing unit to determine a pressing force value; and the piezoelectric pressure sensor 10s detects a touch point position. The pressure sensing unit corresponding to the location; the detecting of the position of the touch point in the step and the magnitude of the pressing force value are performed independently of each other simultaneously or sequentially.

T3: The capacitive 3D detection module responds; the capacitive 3D detection module makes corresponding response actions after determining the position of the touch point and pressing the pressure value, such as jumping, sliding, etc. of the display interface.

T4: End.

Preferably, in step T22, the pressure sensing unit corresponding to the position of the touch point is detected to include at least two pressure sensing units, and the at least two pressure sensing units are respectively located on two sides of the same flexible substrate layer.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalents, and improvements made within the principles of the present invention should be included in the scope of the present invention.

S0-S4‧‧‧ steps

Claims (11)

A capacitive three-dimensional detection module is applied to a capacitive three-dimensional detection module, the capacitive three-dimensional detection module comprising a capacitive touch sensor and a piezoelectric pressure sensor And a capacitive three-dimensional controller integrated on a chip, the capacitive touch sensor includes a plurality of touch units, the piezoelectric pressure sensor includes at least one pressure sensing unit, and the detecting method includes Step: S1: detecting the touch signals of the plurality of touch units by mutual capacitance to determine the position of the touch point; and S2: detecting the pressure signal of the at least one pressure sensitive unit by using a self-capacitance method Determining the pressing force value, the at least one pressure sensing unit in the step corresponding to the touch point position determined in step S1; the touch signal and the pressure signal are operated by the capacitive three-dimensional controller deal with. The method for detecting a capacitive three-dimensional detection module according to claim 1, further comprising: the piezoelectric pressure sensor comprising a first pressure sensing layer and a second pressure sensing layer, the first pressure sensing At least one of the pressure sensitive layer is disposed on the layer and the second pressure sensitive layer; the first pressure sensitive layer is a positive temperature coefficient pressure sensitive layer made of a pressure sensitive material with a positive temperature coefficient, and the second pressure sensitive layer a negative temperature coefficient pressure sensitive layer made of a pressure sensitive material having a negative temperature coefficient, at least on the second pressure sensitive layer A pressure signal of the pressure sensing unit is used as a temperature compensation target of the pressure signal of at least one of the pressure sensing units on the first pressure sensing layer. The method for detecting a capacitive three-dimensional detection module according to claim 1, further comprising: a starting point and an ending point of the detection period of the touch signal and a starting point of the pressure signal detecting period The end point is misplaced. The method for detecting a capacitive three-dimensional detection module according to claim 1, further comprising: the at least one pressure sensing unit is disposed corresponding to the positions of the plurality of touch units. A capacitive three-dimensional detection module is applied to a capacitive three-dimensional detection module, the capacitive three-dimensional detection module comprising a capacitive touch sensor and a piezoelectric pressure sensor And a capacitive three-dimensional controller integrated on a chip, the capacitive touch sensor comprising a plurality of touch units, the piezoelectric pressure sensor comprising at least one pressure sensing unit, the detecting method comprising the steps : T21: detecting the touch signals of the plurality of touch units by mutual capacitance to determine the position of the touch point; and T22: detecting the pressure signal of the at least one pressure sensitive unit by using a self-capacitance method to determine According to the magnitude of the pressure value, the step T21 and the step T22 are performed independently of each other; the touch signal and the pressure signal are processed by the capacitive three-dimensional controller. The method for detecting a capacitive three-dimensional detection module according to claim 5, further comprising: detecting the touch signal and detecting the timing of the pressure signal. The method for detecting a capacitive three-dimensional detection module according to claim 5, further comprising: detecting the touch signal and simultaneously detecting the pressure signal. The method for detecting a capacitive three-dimensional detection module according to claim 6 or 7, further comprising: a start point and an end point of the detection period of the touch signal and a start of the pressure signal detection period The point and end point are misplaced. The method for detecting a capacitive three-dimensional detection module according to claim 5, further comprising: the at least one pressure sensing unit is corresponding to the position of the plurality of touch units. The method for detecting a capacitive three-dimensional detection module according to claim 5, further comprising: the piezoelectric pressure sensor comprising at least one flexible substrate layer, one of which is disposed on each side of the flexible substrate layer The first pressure sensitive layer and the second pressure sensitive layer are provided with at least one pressure sensing unit on the first pressure sensitive layer and the second pressure sensitive layer. The method for detecting a capacitive three-dimensional detecting module according to claim 10, further comprising: the capacitive three-dimensional controller is configured to apply a pressure signal to the pressure sensing unit on the first pressure sensing layer and the second pressure sensing layer The pressure signals of the pressure sensing unit are superimposed.