TWI646455B - Pressure touch sensing device and its detection method - Google Patents

Abstract

A pressure touch sensing device includes a control chip, a touch detection unit and a pressure detection unit. The touch detection unit includes a touch panel and a touch electrode layer, the touch electrode layer has a plurality of touch sensing electrodes and touch driving electrodes arranged on the touch panel, the touch sensing electrodes and The touch driving electrodes are electrically connected to the control chip. The pressure detection unit and the touch detection unit are spaced apart, and include a substrate and a pressure electrode layer. The pressure electrode layer has a plurality of pressure driving electrodes arranged on the substrate and electrically connected to the control chip. In addition, the present invention also provides a pressure touch sensing detection method using the pressure touch sensing device.

Description

Pressure touch sensing device and its detection method

The invention relates to a touch device and a touch detection method, in particular to a pressure touch sensing device and a detection method thereof.

With the advancement of touch technology, users hope that in addition to the two-dimensional planar touch function, the display panel area also needs to exert pressure (perpendicular to the third three-dimensional direction of the display panel) to induce pressure The sensory operation experience and effects allow users to perform different operations by applying different pressures to the display panel, thereby meeting the users' high requirements for touch effects.

However, the auxiliary buttons of the existing touch devices are mainly divided into physical mechanical buttons and virtual capacitive buttons. Among them, the physical mechanical buttons not only have no touch sensing function, but also have no pressure sensing function, and are repeatedly using physical mechanical case keys In the process, it is easy to cause damage to its buttons, which affects the use of the entire device; and the virtual capacitor buttons in the common auxiliary buttons are, for example, the return button or the HOME button in mobile devices, and only touch There is no pressure sensing function, in addition, whether the physical mechanical buttons or virtual capacitive buttons are placed outside the display panel area, it will affect the mobile phone screen ratio.

Furthermore, in existing touch devices that implement pressure sensing, two controllers must be used to control the two different mechanisms of touch sensing and pressure sensing, which not only consumes cost but also occupies assembly space inside the electronic device.

Therefore, the object of the present invention is to provide a pressure touch sensing device.

Therefore, the pressure touch sensing device of the present invention includes a control chip, a touch detection unit, and a pressure detection unit, and is suitable for installing a display panel between the touch detection unit and the pressure detection unit.

The touch detection unit includes a touch panel and a touch electrode layer, the touch electrode layer has a plurality of touch sensing electrodes and touch driving electrodes arranged on the touch panel, the touch sensing electrodes and The touch driving electrodes are electrically connected to the control chip.

The pressure detection unit and the touch detection unit are spaced apart and include a substrate and a pressure electrode layer. The pressure electrode layer has a plurality of pressure driving electrodes arranged on the substrate and electrically connected to the control chip.

In addition, another object of the present invention is to provide a pressure touch sensing detection method.

Therefore, the pressure touch sensing detection method of the present invention includes a preparation step, a signal sending step, a pressing step, a sensing step, a calculation processing step, and an implementation step.

The preparation step is to prepare the pressure touch sensing device as described above. The signal sending step is for the control chip to send an excitation signal to the touch driving electrodes and the pressure driving electrodes simultaneously or in a time-sharing manner. The pressing step is for a user to press the touch pad of the pressure touch sensing device. In the sensing step, the control chip receives a first capacitance change between the touch sensing electrodes and the touch driving electrodes, and receives a change generated by the excitation signal on the touch sensing electrodes. The calculation processing step is to calculate and process the first capacitance change with the control chip, and calculate and process the change value of the excitation signal on the touch sensing electrodes, and convert the change value into a pressure value to determine whether the pressure value Greater than a predetermined threshold. The implementation step is to confirm the pressing position according to the calculated first capacitance change, and when the pressure value calculated according to the change value of the excitation signal is greater than the predetermined threshold value, confirm the pressing force and trigger the pressure Drive electrodes to achieve pressure sensing.

Moreover, another object of the present invention is to provide another pressure touch sensing detection method.

Therefore, another pressure touch sensing detection method of the present invention includes a preparation step, a signal sending step, a pressing step, a sensing step, a calculation processing step, and an implementation step.

The preparation step is to prepare a pressure touch sensing device with pressure sensing electrodes. The signal sending step is for the control chip to send an excitation signal to the touch driving electrodes and the pressure driving electrodes at the same time. The pressing step is for a user to press the touch pad of the pressure touch sensing device. The sensing step is that the control chip receives a first capacitance change between the touch sensing electrodes and the touch driving electrodes, and receives a first capacitance change between the pressure driving electrodes and the pressure sensing electrodes Two capacitance changes. The calculation processing step is to calculate and process the first capacitance change and the second capacitance change with the control chip, and convert the second capacitance change into a pressure value to determine whether the pressure value is greater than a predetermined threshold value. The realization step is to confirm the pressing position according to the calculated first capacitance change, and when the pressure value calculated according to the second capacitance change is greater than the predetermined threshold value, confirm the pressing force and trigger the pressure to drive the electrodes To achieve pressure sensing.

The effect of the present invention is to integrate touch sensing and pressure sensing into the display area of the display panel, integrate the auxiliary buttons of the touch device into the display area, and control the touch detection unit and the control unit with a single control chip The pressure detection unit, and the touch detection unit and the pressure detection unit operate independently without affecting each other, so that assembly and disassembly are easy, and the user can choose whether to assemble the pressure detection unit according to needs. In addition, the pressure touch sensing detection method can confirm the pressing position through the touch detection unit, and when the pressure value greater than the predetermined threshold value is detected by the control chip, combining the pressing position and the pressing force, through the pressure detection unit Trigger pressure sensing.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same number.

1 and 2, a first embodiment of the pressure touch sensing device of the present invention includes a control chip 20, a touch detection unit 2 electrically connected to the control chip 20, and a touch detection unit The pressure detection unit 3 disposed at two intervals and electrically connected to the control wafer 20 is suitable for mounting a display panel 100 between the touch detection unit 2 and the pressure detection unit 3.

The control chip 20 includes a sensing signal input terminal 201 and a driving signal output terminal 202. In the present invention, the control chip 20 can be disposed on the touch detection unit 2, the pressure detection unit 3, or It is installed on the applied product, and its installation position is not particularly limited. It can be installed according to the structure of the product, as long as the control chip 20 can be electrically connected to the touch detection unit 2 and the pressure detection unit 3.

Specifically, the touch detection unit 2 is disposed on the display panel 100 and includes a touch panel 21 and a touch electrode layer 22. The touch electrode layer 22 has a plurality of touch sensing electrodes 221 and touch driving electrodes 222 disposed on the surface of the touch panel 21 adjacent to the display panel 100, the touch sensing electrodes 221 and the sensing signal input terminal 201 is electrically connected, and the touch driving electrodes 222 are electrically connected to the driving signal output terminal 202.

The pressure detection unit 3 and the touch detection unit 2 are spaced apart and removably connected to the control chip 20, and include a substrate 31 and a pressure electrode layer 32. The pressure electrode layer 32 has a plurality of pressure driving electrodes 321 disposed on the surface of the substrate 31 adjacent to the display panel 100, and the pressure driving electrodes 321 are electrically connected to the driving signal output terminals of the control chip 20 by wires 202. It should be particularly noted here that the pressure electrode layer 32 may also have a ground electrode 300 provided on the substrate 31 and also electrically connected to the control chip 20 by a lead, by providing the ground electrode 300 on the Driving the electrode 321 around the pressure on the periphery of the machine board 31 can avoid external interference and effectively improve the performance of electrostatic discharge (ESD).

In addition, it should be particularly noted that the order in which the touch pad 21 and the touch electrode layer 22 are arranged can be exchanged, and the order in which the substrate 31 and the pressure electrode layer 32 are arranged can also be exchanged. In detail, the touch electrode layer 22 can also be disposed on the surface of the touch panel 21 away from the display panel 100, as long as an additional protective layer (not shown) is added to cover and protect the touch electrode layer 22; similarly, The pressure electrode layer 32 can also be disposed on the surface of the substrate 31 away from the display panel 100, as long as an additional protective layer (not shown) is added to cover and protect the pressure electrode layer 32.

With reference to FIGS. 3 and 4, in detail, the distribution of the pressure driving electrodes 321 on the substrate 31 is not particularly limited, and may be arranged in N columns as shown in FIG. 3 or M rows as shown in FIG. 4. , Can also be arranged in the form of M rows × N columns, where M and N are natural numbers, and M and N ≧ 1. The appearances in FIGS. 3 and 4 are only schematic diagrams, and the electrode patterns can be any triangles. , Rhombic, trapezoidal, or hollowed out bar patterns are applicable. The substrate 31 suitable for the pressure detection unit 3 may be selected from a printed circuit board (PCB), a glass substrate, or a polyethylene terephthalate (PET) substrate.

It should be further explained here that the arrangement order of the pressure detection unit 3 and the display panel 100 can be interchanged as required, that is, the pressure detection unit 3 is located between the display panel 100 and the touch detection unit 2 to allow the overall assembly freedom Degree is higher.

A second embodiment of the pressure touch sensing device of the present invention is substantially the same as the first embodiment, except that the pressure electrode layer 32 further has a plurality of pressure sensing electrodes 322.

Referring to FIG. 5, specifically, the pressure-sensing electrodes 322 are arranged in an array on one surface of the substrate 31 and are electrically connected to the control chip 20 by wires (see FIG. 2). In detail, the pressure-sensing electrodes 322 and the pressure-driving electrodes 321 may be disposed on the same surface of the substrate 31, or may be respectively disposed on the opposite surface of the substrate 31, and the pressure-driving electrodes 321 and the The distribution pattern of the pressure-sensing electrodes 322 is also not particularly limited, and may be formed on the opposite surface of the substrate 31 and arranged in N columns or M rows, or may be formed on the same surface of the substrate 31 and are respectively N The columns are arranged alternately or in M rows. In the second embodiment, the pressure driving electrodes 321 and the pressure sensing electrodes 322 shown in FIG. 5 are arranged on the same surface of the substrate 31 The arrangement in the form of M rows × N columns is taken as an example for illustration, where M and N are natural numbers, and M and N ≧ 1.

It should be explained here that, in the first embodiment and the second embodiment, it is applicable to the touch sensing electrodes 221, the pressure driving electrodes 321, the pressure sensing electrodes 322, and the ground electrode 300 The material can be selected from indium tin oxide, nano silver, graphene, metal, and conductive composites.

It is worth mentioning here that from the aforementioned pressure touch sensing device, in addition to electrically connecting the touch sensing electrodes 221 of the touch detection unit 2 to the control chip 20, the pressure sensing unit 3 of the The pressure driving electrode 321 and the pressure sensing electrodes 322 are also electrically connected to the control chip 20, so that the touch detection unit 2 and the pressure detection unit 3 can be controlled by a single control chip 20, which can save production cost and overall Assembly space inside the device. In addition, the pressure touch-sensing device can also choose whether to install the pressure detection unit 3 according to the user's needs. Its assembly and disassembly are simple and can meet the needs of different consumers.

6 and 7, the following describes the pressure touch sensing detection method of the present invention using the pressure touch sensing devices of the first embodiment and the second embodiment described above.

When using the pressure touch sensing device of the first embodiment, the pressure touch sensing detection method includes the following steps: a preparation step 501, a signal sending step 502, a pressing step 503, a sensing step 504, and a calculation process Step 505, and an implementation step 506.

First, the preparation step 501 is to prepare the pressure touch sensing device of the first embodiment described above. Then, the signal sending step 502 allows the control chip 20 to send an excitation signal to the touch drive electrodes 222 of the touch electrode layer 22 and the pressure drive electrodes 321 of the pressure drive electrode layer 32.

Next, the user is allowed to perform the pressing step 503 and directly press the touch pad 21 with a finger to enter the sensing step 504. When the pressing force is small, only touch sensing is triggered but not pressure sensing. Specifically, at this time, the control chip 20 will sense the touch detection unit 2 and first perform the sensing step 504, the calculation processing step 505 and the implementation step 506 to receive the touch sensing electrodes A first capacitance change between 221 and the touch driving electrodes 222 is calculated and processed by the control chip 20, and the pressed position can be confirmed according to the calculated first capacitance change.

Finally, when the pressing force gradually increases and the touch panel 21 and the touch detection unit 2 are weakly deformed (as shown in FIG. 7), the excitation signal input to the touch sensing electrodes 221 changes, so , The control chip 20 receives the changes generated by the excitation signals on the touch-sensing electrodes 221, and through the calculation processing step 505, the control chip 20 calculates and processes the excitation signals on the touch-sensing electrodes 221 Change value, convert the change value into a pressure value to determine whether the pressure value is greater than a predetermined threshold value set in advance, in the implementation step 506, the pressure value calculated based on the change value of the excitation signal is greater than the When the predetermined threshold value is determined, the control chip 20 can determine the pressing force and trigger the pressure driving electrodes 321, and then combine the pressing position and the pressing force to realize pressure sensing.

With reference to FIG. 8, in more detail, FIG. 8 integrates and briefly subdivides the aforementioned steps of detecting with the pressure touch sensing device of the first embodiment, and block S1 refers to the touch detection unit 2 The sensing process of block S2 refers to the sensing process of the pressure detection unit 3.

Referring to FIGS. 6 and 9, when the preparation step 501 is to prepare the pressure touch sensing device of the foregoing second embodiment, the pressure touch sensing detection method is substantially the same as the pressure touch sensing device using the first force The difference between the detection methods at the time is mainly the sensing step 504 and the calculation processing step 505.

In detail, in the detection method using the pressure touch sensing device of the second embodiment, the sensing step 504 receives the pressure driving electrode 321 and the pressure sensing electrodes 322 in addition to the first capacitance change Between a second capacitance change, and the calculation processing step 505 is to calculate and process the second capacitance change to convert the second capacitance change into a pressure value to determine whether the pressure value is greater than the predetermined threshold previously set .

More specifically, FIG. 9 integrates and briefly subdivides the detection method of the pressure touch sensing device of the second embodiment. Blocks S1 and S2 refer to the sensing process of the touch detection unit 2 and the pressure, respectively. The sensing process of the detecting unit 3 can be seen from FIG. 9, and the difference from the detecting method of the pressure touch sensing device of the first embodiment lies in the block S2.

In summary, the pressure touch sensing device and its detection method of the present invention integrate touch sensing and pressure sensing into the display area of the display panel, can integrate the auxiliary buttons of the touch device into the display area, and can A control chip 20 controls the touch detection unit 2 and the pressure detection unit 3, and allows the user to choose whether to assemble the pressure detection unit 3 as required; in addition, the pressure touch sensing detection method can be detected through the touch The unit 2 confirms the pressing position, and when the control chip 20 detects that the pressure value is greater than the predetermined threshold value, combining the pressing position and the pressing force, the pressure sensing is triggered by the pressure detecting unit, so the purpose of the invention can be achieved.

However, the above are only examples of the present invention, and the scope of implementation of the present invention cannot be limited by this, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the patent specification are still classified as Within the scope of the invention patent.

100‧‧‧Display panel

32‧‧‧Pressure electrode layer

2‧‧‧Touch detection unit

321‧‧‧Pressure driven electrode

20‧‧‧Control chip

322‧‧‧Pressure sensing electrode

201‧‧‧Induction signal input terminal

501‧‧‧ preparation steps

202‧‧‧Drive signal output

502‧‧‧Signal sending steps

21‧‧‧Touchpad

503‧‧‧Press step

22‧‧‧Touch electrode layer

504‧‧‧sensing steps

221‧‧‧Touch sensing electrode

505‧‧‧Calculation processing steps

222‧‧‧Touch drive electrode

506‧‧‧Realization steps

3‧‧‧Pressure detection unit

S1‧‧‧ block

300‧‧‧Ground electrode

S2‧‧‧ block

31‧‧‧ substrate

Other features and functions of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is a schematic side view illustrating a first embodiment of the pressure touch sensing device of the present invention; FIG. 2 is A schematic diagram, assisting FIG. 1 to illustrate a touch detection unit, a pressure detection unit, and a control chip of the first embodiment. FIG. 3 is a schematic diagram illustrating one arrangement of a plurality of pressure driving electrodes of the first embodiment FIG. 4 is a schematic diagram illustrating another arrangement of the pressure-driven electrodes of the first embodiment; FIG. 5 is a schematic diagram illustrating multiple sensing of a second embodiment of the pressure touch sensing device of the present invention One of the arrangement of the electrodes and the plurality of pressure-driven electrodes; FIG. 6 is a schematic flow diagram illustrating the flow chart of the method for detecting pressure touch sensing according to the first embodiment and the second embodiment of the present invention; FIG. 7 is a diagram Side view schematic diagram illustrating the state of the first embodiment being pressed by a user; FIG. 8 is a schematic flow diagram illustrating the pressure touch sensing inspection performed by the first embodiment A detailed flow of the method; and FIG. 9 is a flow diagram explaining the detailed flow of a touch sensing method for detecting a pressure to the second embodiment.

Claims (12)

A pressure touch sensing device, including: a control chip; a touch detection unit, including a touch panel, and a touch electrode layer, the touch electrode layer has a plurality of arrays of touch sensing arranged on the touch panel Electrodes and touch drive electrodes, the touch sensing electrodes and the touch drive electrodes are electrically connected to the control chip; and a pressure detection unit, spaced apart from the touch detection unit, and including a substrate and a pressure electrode The pressure electrode layer has a plurality of pressure driving electrodes arranged on the substrate and electrically connected to the control wafer. The pressure touch sensing device according to claim 1, wherein the control chip includes a sensing signal input terminal and a driving signal output terminal, the touch sensing electrodes and the touch driving electrodes and the sensing signal input terminal Electrically connected, the pressure drive electrodes are electrically connected to the drive signal output. The pressure touch sensing device according to claim 1, wherein the pressure electrode layer further has a ground electrode on the same surface as the pressure driving electrodes, and the ground electrode is electrically connected to the control chip. The pressure touch sensing device according to claim 1, wherein the pressure driving electrodes are arranged in M rows or N columns, and M and N are natural numbers, and M and N ≧ 1. The pressure touch sensing device according to claim 1, wherein the pressure driving electrodes are arranged in M rows × N columns, and M and N are natural numbers, and M and N ≧ 1. The pressure touch sensing device according to claim 1, wherein the pressure electrode layer further has a plurality of pressure sensing electrodes arranged in an array on one surface of the substrate, and the pressure sensing electrodes are electrically connected to the control chip. The pressure touch sensing device according to claim 6, wherein the pressure driving electrodes and the pressure sensing electrodes are alternately arranged in M rows or alternately arranged in N columns, and M and N are natural numbers, M , N ≧ 1. The pressure touch sensing device according to claim 6, wherein the pressure driving electrodes and the pressure sensing electrodes are arranged on the same surface and arranged in M rows × N columns, and M and N are natural numbers, M, N ≧ 1. The pressure touch sensing device according to claim 1, wherein the substrate of the pressure detection unit is selected from a printed circuit board, a glass substrate, or a polyethylene terephthalate substrate. The pressure touch sensing device according to claim 1, wherein the touch sensing electrodes and the pressure driving electrodes are made of materials selected from the group consisting of indium tin oxide, nano silver, graphene , Metals, and conductive compounds. A pressure touch sensing detection method, comprising the following steps: a preparation step, preparing the pressure touch sensing device as described in claims 1 to 5; a signal sending step to allow the control chip to send these touches simultaneously or in a time-sharing manner The control driving electrode and the pressure driving electrodes send out an excitation signal; a pressing step to let a user press the touch pad of the pressure touch sensing device; a sensing step to receive the touch sensing electrodes with the control chip A first capacitance change between the touch driving electrodes, and a change generated by receiving the excitation signal on the touch sensing electrodes; a calculation processing step, the first chip change is calculated and processed by the control chip And calculate and process the change value of the excitation signal on the touch sensing electrodes, and convert the change value into a pressure value to determine whether the pressure value is greater than a predetermined critical value; and an implementation step, based on the calculated processing When the first capacitance changes to confirm the pressing position, and the pressure value calculated according to the change value of the excitation signal is greater than the predetermined threshold value, then Efforts to identify and pressing the trigger of such pressure-driven electrode to achieve pressure sensor. A pressure touch sensing detection method includes the following steps: a preparation step, preparing the pressure touch sensing device as described in claims 6 to 8; a signal sending step to allow the control chip to drive the electrodes and the touch electrodes simultaneously The pressure-driven electrodes emit an excitation signal; a pressing step to allow a user to press the touchpad of the pressure touch sensing device; and a sensing step to receive the touch sensing electrodes and the touches with the control chip Controlling a first capacitance change between the driving electrodes, and receiving a second capacitance change between the pressure driving electrodes and the pressure sensing electrodes; a calculation processing step, calculating and processing the first capacitance change with the control chip Change with the second capacitance, and convert the second capacitance change into a pressure value to determine whether the pressure value is greater than a predetermined threshold; and an implementation step to confirm the pressing position according to the calculated first capacitance change , And when the pressure value calculated based on the change in the second capacitance is greater than the predetermined threshold value, confirm the pressing force and trigger the pressure driving Electrode, to achieve pressure-sensitive.