CN106325578B - Pressure sensitive touch panel - Google Patents

Abstract

The invention relates to a pressure-sensing touch panel, which comprises a substrate, wherein an electrode layer is arranged on one surface of the substrate, the electrode layer comprises a plurality of first-direction touch sensing electrode strings and a plurality of second-direction touch sensing electrode strings, the first-direction touch sensing electrode strings and the second-direction touch sensing electrode strings are insulated from each other and used for detecting touch positions, the first-direction touch sensing electrode strings comprise a plurality of first-direction sensing units, the second-direction touch sensing electrode strings comprise a plurality of second-direction sensing units, a linear hollow structure is arranged in the first-direction sensing unit of at least one first-direction touch sensing electrode string and/or the second-direction touch sensing electrode string of at least one second-direction touch sensing electrode string, and the at least one first-direction touch sensing electrode string and/or one second-direction touch sensing electrode string has a pressure detection function.

Description

Pressure sensitive touch panel

【Technical field】

The invention relates to a touch panel, in particular to a pressure-sensitive touch panel with a linear hollow design.

【Background technique】

At present, most touch panels on the market only have touch position detection, and with the diversification of functions of electronic products, more and more usage scenarios need to detect the force at the touch points to complete more product functions and improve user experience. Since most of the existing touch panels do not have pressure detection functions, adding a pressure detection function on the basis of the existing touch panel structure requires adding at least one additional pressure detection layer, which will significantly increase the thickness of the touch panel and increase the cost of materials. People have made a lot of attempts. In order to meet the requirements of light and thin products without increasing the difficulty of electrode wiring and reducing production costs, the present invention revolves around the above problems and proposes a new manufacturing concept. The manufactured touch panel can better solve the above problems.

【Content of invention】

In order to overcome the problem of increasing the thickness of the touch panel and increasing the cost of materials when adding a pressure-sensing functional layer to the touch panel in the prior art, the present invention provides a pressure-sensing touch panel that can better solve these problems.

The solution to the technical problem of the present invention is to provide a pressure-sensing touch panel, which includes a substrate, and an electrode layer is arranged on one of the surfaces of the substrate, including a plurality of first-direction touch-sensing electrode series and a plurality of second-direction touch-sensing electrode series; the first-direction touch-sensing electrode series and the second-direction touch-sensing electrode series are insulated from each other, and are used for touch position detection; the first-direction touch-sensing electrode series includes a plurality of first-direction sensing units, and the second-direction touch-sensing electrode series includes a plurality of second-direction sensing units; The first direction sensing unit and/or the second direction sensing unit of at least one second direction touch sensing electrode string is provided with a linear hollow structure, and the at least one first direction touch sensing electrode string and/or at least one second direction touch sensing electrode string have a pressure detection function.

Preferably, the pressure-sensing touch panel further includes a circuit system, the circuit system includes a plurality of first wires, second wires, and a Wheatstone bridge circuit, and each first-direction touch sensing electrode series and/or second-direction touch-sensing electrode series are conductively connected to the Wheatstone bridge circuit through a first wire and a second wire, the first-direction touch-sensing electrode series and/or the second-direction touch-sensing electrode series constitute one of the elements of the Wheatstone bridge circuit, and the change in resistance value generated after being touched is detected by the Wheatstone bridge circuit.

Preferably, the touch position detection and pressure detection of the first direction sensing unit and/or the second direction sensing unit are performed in time sequence.

Preferably, the pressure-sensitive touch panel further includes a protective cover, the protective cover includes a first surface and a second surface, the first surface and the second surface are oppositely arranged, and the first surface is used for a user to apply a touch action.

Preferably, the shape of the hollow structure is a sine wave line, a zigzag line, a spiral line, a square wave line or a criss-cross line.

Preferably, the area of the linear hollow structure of any first direction sensing unit and/or second direction sensing unit is respectively 10%-50% of the area of the corresponding first direction sensing unit or second direction sensing unit.

Preferably, the pressure-sensitive touch panel further includes an optical layer disposed on the electrode layer; the optical layer includes a low refractive index layer with a refractive index of 1.1-1.6; and/or a high refractive index layer with a refractive index of 1.8-2.7.

Preferably, the material of the electrode layer is any one of ITO, silver-doped ITO, nano-silver wire, graphene, nano-metal grid, carbon nanotube or a combination thereof.

Preferably, an insulating block is provided at the intersection of the first-direction touch-sensing electrode series and the second-direction touch-sensing electrode series on one surface of the substrate, and the insulating block is located between the first-direction touch-sensing electrode series and the second-direction touch-sensing electrode series.

The present invention also provides a pressure-sensing touch panel, comprising a protective cover, the protective cover includes a first surface and a second surface, the first surface and the second surface are arranged oppositely, the first surface is for the user to apply a touch pressure action, a first electrode layer, a second electrode layer and a substrate, the substrate is located between the first electrode layer and the second electrode layer, the first electrode layer is located between the protective cover and the substrate, wherein the first electrode layer includes a plurality of touch sensing electrode strings in the first direction, the second electrode layer includes a plurality of touch sensing electrode strings in the second direction, the first direction touch sensing electrode string and the second electrode layer The direction touch sensing electrode strings are insulated from each other for touch position detection. The first direction touch sensing electrode string includes a plurality of first direction sensing units, and the second direction touch sensing electrode string includes a plurality of second direction sensing units. At least one first direction touch sensing electrode string is provided with a linear hollow structure in the first direction sensing unit. The electrode string and/or at least one second-direction touch-sensing electrode string has a pressure detection function.

【Description of drawings】

FIG. 1 is a schematic diagram of the exploded structure of the first embodiment of the pressure-sensitive touch panel of the present invention.

FIG. 2 is a schematic front view of the electrode layer in the first embodiment of the pressure-sensitive touch panel of the present invention.

FIG. 3 is a schematic structural diagram of the Wheatstone bridge circuit in the first embodiment of the pressure-sensing touch panel of the present invention.

FIG. 4 is a time-division sequence diagram of detection circuit signals in the first embodiment of the pressure-sensitive touch panel of the present invention.

FIG. 5 is an enlarged cross-sectional view at A shown in FIG. 2 of the first embodiment of the pressure-sensitive touch panel of the present invention.

6-8 are schematic diagrams of other deformations of the electrode layer in the first embodiment of the pressure-sensitive touch panel of the present invention.

9 is a schematic front view of the electrode layer in the second embodiment of the pressure-sensitive touch panel of the present invention.

FIG. 10 is an enlarged cross-sectional view at B in FIG. 9 .

FIG. 11 is a schematic front view of the electrode layer in the third embodiment of the pressure-sensitive touch panel of the present invention.

FIG. 12 is a schematic diagram of the exploded structure of the fourth embodiment of the pressure-sensitive touch panel of the present invention.

13 is a schematic front view of the electrode layer in the fourth embodiment of the pressure-sensitive touch panel of the present invention.

14 is a schematic front view of another electrode layer in the fourth embodiment of the pressure-sensitive touch panel of the present invention.

【Detailed ways】

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to FIG. 1 , the pressure-sensitive touch panel 1 according to the first embodiment of the present invention includes a protective cover 11 , an electrode layer 13 , an optical layer 14 and a substrate 15 . The protective cover 11 has a first surface and a second surface and the first surface and the second surface are oppositely arranged. The touch-press action is given to the protective cover 11, and the force is transmitted to the electrode layer 13 under the protective cover 11. The electrode layer 13 senses the position and force of the touch-press action. Different touch-pressure quantities can define different functional operations. Such a design can greatly improve the user experience and satisfaction of using the product. The substrate 15 can be a rigid substrate, such as glass, strengthened glass, sapphire glass, etc.; it can also be a flexible substrate, such as PEEK (polyetheretherketone, polyetheretherketone), PI (Polyimide, polyimide), PET (polyethylene terephthalate, polyethylene terephthalate), PC (polycarbonate polycarbonate), PES (polyethylene succinate, PMMA (polymethyl methacrylate, poly methylmethacrylate) and composites of any two or more thereof. As a modified embodiment, the substrate 15 of the pressure-sensitive touch panel (not shown) of the present invention includes a first surface and a second surface. A protective cover 11 is added. The pressure-sensitive touch panel (not shown) in this modified embodiment may further include an optical layer 14 disposed between the second surface of the substrate 15 and the electrode layer 13 .

Please refer to FIG. 2 , the electrode layer 13 in the first embodiment of the pressure-sensitive touch panel 1 of the present invention includes a plurality of first-direction touch-sensing electrode strings 131 and a plurality of second-direction touch-sensing electrode strings 133 , and a plurality of first-direction sensing units 1311 and a plurality of first-direction connecting parts 1313 are alternately arranged in the first-direction touch-sensing electrode strings 131 . Similarly, a plurality of second-direction sensing units 1331 and a plurality of second-direction connecting parts 1333 are alternately arranged in the second-direction touch-sensing electrode series 133, and each second-direction touch-sensing electrode series 133 includes a first end 1337 and a second end 1338 opposite to the first end. The plurality of first-direction touch-sensing electrode strings 131 are evenly spaced and arranged in parallel, and the plurality of second-direction touch-sensing electrode strings 133 are also evenly spaced and arranged in parallel. Each second direction sensing unit 1331 has a sinusoidal linear second direction electrode hollow 1335, of course, the second direction electrode hollow 1335 can only be provided in the second direction sensing unit 1331 of the plurality of second direction touch sensing electrode strings 133, such as selecting 4 second direction touch sensing electrode strings 133 with equal intervals, and setting the second direction electrode hollow 1335 in the second direction sensing unit 1331.

There is also a circuit system 19 in the pressure-sensing touch panel 1. The circuit system 19 includes electrode connecting wires 191, FPC (Flexible Printed Circuit board, flexible printed circuit board) 193, and a pressure-sensing chip 195. The pressure-sensing chip 195 includes a Wheatstone bridge circuit 1951 and other module circuits (not shown). The electrode connection wire 191 is divided into a first wire 1911 and a second wire 1913. One end of each first wire 1911 is connected to the FPC 193, and the other end is connected to the first end 1337 of the second-direction touch-sensing electrode string 133. Similarly, one end of each second wire 1913 is connected to the FPC 193, and the other end is connected to the second end 1338 of the second-direction touch-sensing electrode string 133. The first-direction touch-sensing electrode series 131 is only used to detect the touch position. It adopts the first wire 1911 and the second wire 1913 . If one of the first wire 1911 or the second wire 1913 is broken, the detection of the touch position will not be affected.

The pressure sensing function of the pressure touch panel 1 of the present invention is mainly based on the fact that the second-direction touch sensing electrode string 133 is deformed and the resistance value changes after external pressure is applied. Because of the second-direction electrode hollow 1335, the second-direction touch-sensing electrode string 133 can undergo relatively large deformation, and can also take into account the position detection function of the second-direction touch-sensing electrode string 133. The second-direction touch-sensing electrode series 133 is connected to the FPC193 through the electrode connection line 191, and the resistance value change of the second-direction touch-sensing electrode series 133 will be directly detected by the FPC193 via the Wheatstone bridge circuit 1951, and then processed by other module circuits of the pressure-sensing chip 195, thereby realizing the pressure-sensing function. Generally, the deformation and resistance change of the second-direction touch-sensing electrode series 133 have the following formula:

GF=(△R/R)/(△L/L), GF is the strain gauge factor, R is the initial resistance value of the touch sensing electrode string 133 in the second direction, L is the total length of the touch sensing electrode string 133 in the second direction, ΔR is the change amount of the resistance value of the touch sensing electrode string 133 in the second direction, ΔL is the change amount of the length of the touch sensing electrode string 133 in the second direction, when the values of GF, R and L are fixed, the length change amount ΔL of the touch sensing electrode string 133 in the second direction The larger the value, the better the resistance change ΔR of the touch sensing electrode string 133 in the second direction can be detected. In order to obtain a better sensing effect, the value of GF must be greater than 0.5.

Please refer to FIG. 3 , in the first embodiment of the pressure-sensing touch panel 1 of the present invention, the Wheatstone bridge circuit 1951 can detect the change of the resistance value of the second-direction touch-sensing electrode series 133 to perform subsequent signal processing. The corresponding electrical signal of the bridge circuit 1951 changes. In the figure, ΔR is the resistance of the second-direction touch-sensing electrode string 133. After the Wheatstone bridge circuit 1951 detects the change in resistance of the second-direction touch-sensing electrode string 133, other module circuits of the pressure sensing chip 195 perform signal amplification and other processing.

4 is a timing diagram of electrical signal scanning by the circuit system 19. The touch position is detected during the time period t1-t2, which corresponds to the touch detection voltage. After scanning the electric signal of the touch position, the pressure detection is performed during the time period t3-t4. At this time, the detection of the touch position is turned off. Similarly, the detection of the touch position is performed during the time period t5-t6, and the pressure is detected during the time period t7-t8, and the cycle continues in turn.

The function of the pressure-sensing touch panel 1 to detect the touch position is to determine the position of the touch point by detecting the mutual capacitance change signal of the corresponding positions of the first-direction touch-sensing electrode series 131 and the second-direction touch-sensing electrode series 133 by the system. The setting of different signals for segment detection can effectively achieve the dual functions of touch position detection and pressure detection, and avoid interference between signals.

Please refer to FIG. 5 , through the linear hollow design in the second direction sensing unit 1331, the second direction electrode hollow 1335 makes the corresponding second direction sensing unit 1331 be divided into two parts, the ends of the upper half of the second direction sensing unit 13311 and the lower half of the second direction sensing unit 13313 are connected to each other and connected in parallel, when the system detects pressure and the touch panel is stressed, the corresponding part of the second direction touch sensing electrode string 133 is more likely to deform, and the amount of change in resistance It also increases correspondingly, which is beneficial to the accurate detection of the pressure.

The hollow area of the second-direction electrode hollow 1315 is 10-50% of the area of the corresponding second-direction sensing unit 1331. If the hollow area is too large, the mutual capacitance between the second-direction touch-sensing electrode string 133 and the first-direction touch-sensing electrode string 131 will decrease, which is not conducive to the detection of the touch position by the touch panel.

The materials of the first-direction touch-sensing electrode series 131 and the second-direction touch-sensing electrode series 133 can be ITO (indium tin oxide), silver-doped ITO, nano-silver wire, graphene, nano-metal grid, and carbon nanotube. Since ITO has a negative temperature coefficient of resistance (temperature rises, resistivity decreases), the temperature coefficient of resistance of ITO is -650ppm/°C measured at room temperature, while Ag and most metals have a large positive temperature coefficient of resistance, 3800ppm/°C at room temperature. When the Ag doping amount is 25at%, the optimal piezoresistive performance at room temperature can be obtained. The temperature coefficient of resistance is 130ppm/°C at 300-600°C, which is about 1/5 of undoped. Solve the noise effect of temperature on the change of ITO resistance.

Since the second-direction touch-sensing electrode series 133 is hollowed out in a linear manner, the etching lines are many and complicated, which easily affects the visual effect. The optical layer 14 in the pressure-sensing touch panel 1 is arranged between the protective cover 11 and the electrode layer 13. This problem can be effectively solved. The optical layer 14 is made of a single layer of low-refractive-index material, or a layer of high-refractive-index material and a layer of low-refractive-index material.

The low refractive index is less than 1.6, preferably 1.1-1.6, preferably 1.1, 1.25, 1.32, 1.38, 1.46, 1.50, 1.52. At this time, the material of the low refractive index optical layer 14 may be organic or inorganic, or an organic-inorganic hybrid coating. Examples include silicon oxides, chlorofluorides, magnesium fluoride, silicon dioxide, lithium fluoride, sodium fluoride, magnesium oxide, silicates, polyurethanes, PMMA, PVA, PVP, silicones, fluoropolymers, acrylic resins, mixtures of acrylic resins with silica nanoparticles, and adhesives.

The high refractive index is greater than 1.8, preferably 1.8-2.7. Preferred refractive indices are 1.8, 1.85, 2.0, 2.2, 2.4, 2.7. At this time, the material of the high refractive index optical layer 14 can be organic or inorganic, or an organic-inorganic hybrid coating, for example: tantalum oxide, titanium oxide, niobium oxide, lead oxide, zinc sulfide, zirconium oxide, polyimide, ZrO2, Pb5O11, Ta2O5, niobium pentoxide, titanium dioxide, silica gel, a mixture of acrylic resin and titanium dioxide nanoparticles.

Please refer to FIG. 6-FIG. 8, the hollow shape of the second direction sensing unit 1331 in the pressure-sensitive touch panel 1 of the first embodiment of the present invention can also be a zigzag line hollow, a spiral line hollow or a cross line hollow, of course it can also be a square wave line hollow (not shown).

Please refer to FIG. 9 , in the second embodiment of the pressure-sensing touch panel 2 of the present invention, the first-direction touch-sensing electrode series 231 of each first-direction sensing unit 2311 also performs a linear hollow design to form a plurality of first-direction electrode hollows 2315 , the second-direction electrode hollows 2315 and the first-direction electrode hollows 2335 have the same hollow shape and their relative positions are fixed. , the greater the change in the resistance value, the more conducive to the detection of the system. Of course, compared with the pressure-sensing touch panel 1 of the first embodiment, it is also possible to add linear hollow structures only in the first direction sensing units 231 of the plurality of first direction touch sensing electrode strings 231 , such as selecting four of the first direction touch sensing electrode strings 231 equally spaced, and setting linear first direction electrode hollows 2315 in the first direction sensing units 2311 .

The first-direction touch-sensing electrode series 231 and the second-direction touch-sensing electrode series 233 have both touch position detection and pressure detection functions. It is only necessary to make corresponding changes to the existing first-direction touch-sensing electrode series 231, second-direction touch-sensing electrode series 233 and electrode connection lines 291, which avoids adding an additional pressure-sensing electrode layer, saves costs, and is more in line with the concept of thinner products.

Please refer to FIG. 10 , since the first-direction touch-sensing electrode series 231 and the second-direction touch-sensing electrode series 233 are located on the same electrode layer 23 , the intersecting parts need an insulating block 235 to be electrically separated to avoid signal interference. In FIG. 9 , the second direction connecting portion 2333 and the first direction connecting portion 2313 are separated by an insulating block 235 , this setting can effectively prevent the two direction electrodes from being electrically connected and unable to detect the touch position and pressure.

Please refer to FIG. 11 , in the third embodiment of the pressure-sensing touch panel 3 of the present invention, the electrode layer 33 includes a plurality of first-direction touch-sensing electrode series 331, each first-direction touch-sensing electrode series 331 includes a first touch-sensing electrode 3311 and a second touch-sensing electrode 3313, the first touch-sensing electrode 3311 includes a plurality of first touch-sensing electrode protrusions 33111, and the second touch-sensing electrode 3313 also includes a plurality of second touch-sensing electrode protrusions 33131 The second electrode hollow 33133 is formed by the hollowing process in the detection electrode 3313. The area of the second electrode hollow 33133 is 10-50% of the area of the corresponding second touch sensing electrode 3313. The first touch sensing electrode 3311 and the second touch sensing electrode 3313 are complementary and do not contact each other. This design can reduce the bridging structure between the first touch sensing electrode 3311 and the second touch sensing electrode 3313.

Referring to FIG. 12 , the pressure-sensitive touch panel 4 according to the fourth embodiment of the present invention includes a protective cover 41 , a first electrode layer 421 , a first substrate 42 , a second electrode layer 431 and a second substrate 43 , the first electrode layer 421 is formed on the first substrate 42 , and the second electrode layer 431 is formed on the second substrate 43 . As a variation of the fourth embodiment, the first electrode layer 421 and the second electrode layer 431 are respectively formed on the upper and lower surfaces of the first substrate 42 , without further disposing the second substrate 43 .

Please refer to FIG. 13 , the first electrode layer 421 in the pressure-sensitive touch panel 4 of the fourth embodiment of the present invention includes a plurality of first-direction touch-sensing electrode series 4211 , the first-direction touch-sensing electrode series 4211 includes a plurality of first-direction sensing units 42111 , a first-direction connecting portion 42115 and a first-direction electrode hollow 42113 , the first-direction electrode hollow 42113 is curved and formed in the first-direction sensing unit 42111 .

Please refer to FIG. 14 , the second electrode layer 431 in the pressure-sensing touch panel 4 of the fourth embodiment of the present invention includes a plurality of second-direction touch-sensing electrode series 4311 , the second-direction touch-sensing electrode series 4311 includes a plurality of second-direction sensing units 43111 , a second-direction connecting portion 43115 and a second-direction electrode hollow 43113 , the second-direction electrode hollow 43113 is curved and formed in the second-direction sensing unit 43111 .

Compared with the multiple first-direction touch-sensing electrode strings 4211 in the first electrode layer 421, the multiple second-direction touch-sensing electrode strings 4311 in the second electrode layer 431 also have second-direction electrode hollows 43113. When the system performs time-sequential scanning of electrical signals, the touch position detection function is turned off to detect pressure. At this time, pressure signals can be scanned for the corresponding positions of the first-direction touch-sensing electrode strings 4311 and the second-direction touch-sensing electrode strings 4211 at the same time. Surface scanning detection, so the signal will be stronger than the signal obtained by only scanning the first-direction touch-sensing electrode string 4211 in the first electrode layer 421. Since the second electrode layer 431 is located far away from the protective cover 41, when the user exerts force, the change in resistance value it can bring is relatively small, and hollowing out the curved line on the second electrode layer 431 will increase additional costs. In 11, the linear hollowing process is carried out. Of course, it is also possible to select a plurality of equally spaced arrays from the first-direction touch-sensing electrode string 4211 for linear hollowing out, and to have a pressure detection function, such as selecting four or ten electrodes.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the principles of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. A pressure-sensitive touch panel, comprising:

the touch sensing device comprises a substrate, a first electrode layer, a second electrode layer and a first electrode layer, wherein an electrode layer is arranged on one surface of the substrate and comprises a plurality of first direction touch sensing electrode strings and a plurality of second direction touch sensing electrode strings;

the first direction touch sensing electrode string and the second direction touch sensing electrode string are insulated from each other and used for detecting touch positions;

the first direction touch sensing electrode string comprises a plurality of first direction sensing units, and the second direction touch sensing electrode string comprises a plurality of second direction sensing units;

a linear hollow structure is arranged in a first direction sensing unit of at least one first direction touch sensing electrode string and/or a second direction sensing unit of at least one second direction touch sensing electrode string, and the at least one first direction touch sensing electrode string and/or the at least one second direction touch sensing electrode string have a pressure detection function;

the pressure sensing touch panel further comprises a circuit system, the circuit system comprises a plurality of first wires, second wires and a Wheatstone bridge circuit, each first-direction touch sensing electrode string and/or each second-direction touch sensing electrode string are connected to the Wheatstone bridge circuit in a conducting manner through the first wires and the second wires, the first-direction touch sensing electrode strings and/or the second-direction touch sensing electrode strings form one element of the Wheatstone bridge circuit, and the resistance change generated after the touch sensing electrode strings and/or the second-direction touch sensing electrode strings are detected through the Wheatstone bridge circuit.

2. The pressure-sensitive touch panel of claim 1, wherein: the touch position detection and the pressure detection of the first direction sensing unit and/or the second direction sensing unit are performed in a time sequence.

3. The pressure-sensitive touch panel of claim 1, wherein: the protection cover plate comprises a first surface and a second surface, the first surface and the second surface are oppositely arranged, and the first surface is used for a user to apply a touch action.

4. The pressure-sensitive touch panel of claim 1, wherein: the hollow structure is in a sine wave line shape, a sawtooth line shape, a spiral line shape, a square wave line shape or a cross staggered line shape.

5. The pressure-sensitive touch panel of claim 1, wherein: the area of the linear hollow structure of any one of the first direction sensing units and/or the second direction sensing units is 10% -50% of the area of the corresponding first direction sensing unit or second direction sensing unit respectively.

6. The pressure-sensitive touch panel of claim 1, wherein: the optical layer is arranged on the electrode layer; the optical layer comprises a low refractive index layer with a refractive index of 1.1-1.6; and/or a high refractive index layer having a refractive index of 1.8 to 2.7.

7. The pressure-sensitive touch panel of claim 1, wherein: the electrode layer is made of any one or combination of IT O, silver-doped IT O, nano silver wires, graphene, nano metal grids and carbon nano tubes.

8. The pressure-sensitive touch panel according to any one of claims 1-7, wherein: an insulating block is arranged at the intersection of the first direction touch sensing electrode string and the second direction touch sensing electrode string on one surface of the substrate, and the insulating block is positioned between the first direction touch sensing electrode string and the second direction touch sensing electrode string.

9. A pressure-sensitive touch panel, comprising:

the protective cover plate comprises a first surface and a second surface, the first surface and the second surface are oppositely arranged, and the first surface is used for a user to apply a touch action;

a first electrode layer and a second electrode layer;

and a substrate between the first electrode layer and the second electrode layer; the first electrode layer is positioned between the protective cover plate and the base plate;

wherein the first electrode layer comprises a plurality of first-direction touch sensing electrode strings;

the second electrode layer comprises a plurality of second-direction touch sensing electrode strings;

the first direction touch sensing electrode string and the second direction touch sensing electrode string are insulated from each other and used for detecting touch positions;

the first direction touch sensing electrode string comprises a plurality of first direction sensing units, and the second direction touch sensing electrode string comprises a plurality of second direction sensing units;

at least one first direction touch sensing electrode string is internally provided with a linear hollow structure, and the at least one first direction touch sensing electrode string has a pressure detection function; or at least one first direction sensing unit of the first direction touch sensing electrode string and at least one second direction sensing unit of the second direction touch sensing electrode string are respectively provided with a linear hollow structure, and the at least one first direction touch sensing electrode string and the at least one second direction touch sensing electrode string have a pressure detection function.