CN106325580B

CN106325580B - pressure sensing device

Info

Publication number: CN106325580B
Application number: CN201510404544.9A
Authority: CN
Inventors: 陈风; 袁琼; 张凡忠
Original assignee: TPK Touch Solutions Xiamen Inc
Current assignee: TPK Touch Solutions Xiamen Inc
Priority date: 2015-07-10
Filing date: 2015-07-10
Publication date: 2023-10-17
Anticipated expiration: 2035-07-10
Also published as: CN106325580A; TWI590127B; TWM529883U; TW201702841A

Abstract

The invention relates to the technical field of pressure sensing, in particular to a pressure sensing device capable of detecting pressure force. The device comprises a substrate, a first substrate and a second substrate, wherein the first surface and the second surface are oppositely arranged; the conductive pattern layer is arranged on the first surface and comprises a plurality of pressure sensing electrodes for sensing the touch pressure; and the pressure sensing signal wire is used for conducting and connecting the pressure sensing electrode to a detection chip, and the pressure sensing signal wire is of a hollow structure.

Description

Pressure sensing device

[ field of technology ]

The invention relates to the technical field of pressure sensing, in particular to a pressure sensing device capable of detecting pressure force.

[ background Art ]

At present, in the technical field of display, a commonly used touch panel mainly includes a capacitive touch panel, a resistive touch panel, an optical touch panel and a surface acoustic wave touch panel, and these touch panels are mainly used for detecting the touch position of a two-dimensional plane area, and a processing chip feeds back a corresponding processing signal according to the touch position. Moreover, the capacitive touch panel has the most wide application range.

The operation of fingers on the touch panel is quite rich and complex, not only the touch action but also the press action, and the capacitive touch panel can only detect the touch position in a two-dimensional plane at present, but also can not detect the press force in another dimension. Thus, a new pressure sensing device capable of detecting the Z-axis pressing force is developed.

The pressure sensing is based on the fact that the conductive material after pressing is detected due to resistance change caused by deformation, and the change of the resistance value is very tiny due to the fact that the deformation is very tiny, and if a resistance value change signal decays in the transmission process, the resistance value change signal is possibly not detected. Therefore, effective and accurate transmission of pressure touch signals is a difficult problem to be overcome.

[ invention ]

In order to overcome the defects of the existing pressure sensing device, the invention provides a novel pressure sensing device.

The invention provides a pressure sensing device, which comprises a substrate, a first sensor and a second sensor, wherein the substrate comprises a first surface and a second surface which are oppositely arranged; the conductive pattern layer is arranged on the first surface and comprises a plurality of pressure sensing electrodes for sensing the touch pressure; and the pressure sensing signal wire is used for conducting and connecting the pressure sensing electrode to a detection chip, and the pressure sensing signal wire is of a hollow structure.

Preferably, the pressure sensing signal line is a metal line.

Preferably, the area of the hollowed-out area of the pressure sensing signal wire with the unit length after being hollowed-out is more than or equal to 40% of the area of the volume of the pressure sensing signal wire.

Preferably, the pressure sensing signal wire is hollowed out to form a hollowed-out area and a plurality of metal unit wires, wherein the shape of the metal unit wires can be any one of grid, tree-shaped, loop-around loop shape or the combination thereof, and the line width is smaller than 10 μm.

Preferably, the pressure sensing signal line has an S-shape, a Z-shape, or an irregular curve shape.

Preferably, the conductive pattern layer further includes a plurality of first direction touch electrodes and a plurality of second direction touch electrodes, the first direction touch electrodes and the second direction touch electrodes are used for detecting touch positions, wherein the first direction touch electrodes, the second direction touch electrodes and the pressure sensing electrodes are electrically insulated from each other, and projections in the vertical direction are not overlapped.

Preferably, each first direction touch electrode is connected with a first direction touch electrode signal line in a conducting manner, each second direction touch electrode is connected with a second direction touch electrode signal line in a conducting manner, and the materials, structures and shapes of the first direction touch electrode signal line and the second direction touch electrode signal line are the same as those of the pressure sensing signal line.

Preferably, each first direction touch electrode is connected with a first direction touch electrode signal line in a conducting manner, each second direction touch electrode is connected with a second direction touch electrode signal line in a conducting manner, and the materials and structures of the first direction touch electrode signal line and the second direction touch electrode signal line are different from those of the pressure sensing signal line.

Preferably, the pressure sensing device comprises a pressure sensing area and a connecting area, wherein the pressure sensing area is internally provided with a conductive pattern layer and a pressure sensing signal wire, the connecting area is internally provided with a pressure sensing signal wire and a connecting pad, and the pressure sensing signal wire is integrally connected with the conductive pattern layer of the pressure sensing area and the connecting pad of the connecting area.

Preferably, the touch sensing device further comprises a transition area, wherein the transition area is positioned between the touch sensing area and the connecting area, and the width of the pressure sensing signal line in the transition area is widened and is 2-10 times of that of the pressure sensing signal line in the pressure sensing area.

Compared with the prior art, the pressure sensing device integrates the pressure sensing electrode, the first direction touch electrode and the second direction touch electrode on the same basic same plane, and when the pressure sensing electrode, the first direction touch electrode and the second direction touch electrode are integrated, the pressure sensing electrode, the first direction touch electrode and the second direction touch electrode adopt complementary non-overlapping shape designs, and compared with the traditional structure of externally attaching the pressure sensing device to a touch screen, the pressure sensing device is lower in thickness and cost, and solves the problem of signal line visibility while reducing the panel thickness.

The first embodiment adopts the metal pressure sensing electrode signal wire to conduct signals, and the signal attenuation problem caused by self resistance can be effectively avoided in the signal transmission process due to the low metal resistance. However, when the pressure sensing device is combined with the display module, the pressure sensing electrode and the signal wire are required to have light transmittance, so that the problem of vision shielding of the display module cannot be caused. Because the light transmittance of the metal is relatively poor, the pressure sensing electrode signal wire is hollowed out, so that the problem of visual blocking of the pressure sensing electrode signal wire to the lower display module can be solved, and the excellent signal conduction characteristic of the metal can be maintained. The hollow shape adopts the shapes of grid, tree, loop back and the like, and ensures that each metal unit line has at least two lap joints, thereby effectively preventing the problem of poor connection caused by circuit breakage.

The connecting area and the pressure sensing area are integrally designed, and the binding area and the FPC are not required to be independently manufactured in the pressure sensing area for binding, so that the problem of the increase of the binding area caused by excessive signal wires can be effectively solved, the manufacturing process is simplified, and the cost is reduced.

In some embodiments of the invention, the signal lines of the transition region are designed to be gradually widened, so that the bending resistance of the signal can be enhanced. In other embodiments, the wiring shape of the signal line is changed from an "L" shape to a "Z" shape, an "S" shape, or an irregular curve, so as to effectively reduce the problem of the signal line being visible due to light interference, and avoid the problem that the signal line shields the display pixels.

[ description of the drawings ]

Fig. 1 is a schematic cross-sectional view of a touch principle of a pressure sensing device according to the present invention.

Fig. 2 is a schematic plan view of a touch principle of the pressure sensing device of the present invention.

FIG. 3 is a schematic cross-sectional view of a first embodiment of a pressure sensing device according to the present invention.

FIG. 4 is a schematic plan view of a conductive pattern layer of a first embodiment of a pressure sensing device of the present invention.

Fig. 5A, 5B, 5C are three enlarged schematic structural views at a shown in fig. 4.

FIG. 6A is a schematic plan view of a conductive pattern layer of a second embodiment of a pressure sensing device of the present invention.

FIG. 6B is a schematic plan view of a conductive pattern layer of a third embodiment of a pressure sensing device of the present invention.

FIG. 7 is a schematic plan view of a conductive pattern layer of a fourth embodiment of a pressure sensing device of the present invention.

FIG. 8 is a schematic plan view of a conductive pattern layer of a fifth embodiment of a pressure sensing device of the present invention.

Fig. 9 is an enlarged schematic view of the transition region of fig. 8.

FIG. 10 is a schematic plan view of a conductive pattern layer of a sixth embodiment of a pressure sensing device of the present invention.

FIG. 11A is a schematic plan view of a conductive pattern of a seventh embodiment of a pressure sensing device of the present invention.

FIG. 11B is a schematic plan view of a conductive pattern of an eighth embodiment of a pressure sensing device of the present invention.

FIG. 12 is a flowchart illustrating a manufacturing process of a pressure sensing device according to a ninth embodiment of the present invention.

[ detailed description ] of the invention

For the purpose of making the technical solution and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and examples of implementation. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

Referring to fig. 1 and 2, a schematic structural diagram of a pressure sensing device 800 according to the present invention is shown, but the pressure sensing device described below is not limited thereto. The pressure sensing device 800 includes a substrate 802, a pressure sensing layer 803 is adhered on the substrate 802, a cover plate 801 is further disposed on an upper portion (herein and hereinafter referred to as "upper" or "lower" is not defined absolutely, and it can be understood that the upper surface is inverted or becomes the lower surface) of the pressure sensing layer 803, and the cover plate 801 is in contact with a touch object (finger or stylus).

The pressure sensing layer 803 includes a plurality of pressure sensing electrodes 8031 extending along a length direction, and the plurality of pressure sensing electrodes 8031 are regularly or irregularly arranged on the pressure sensing layer 803. Here, the principle explanation is made with the pressure-sensitive electrodes 8031 formed in two stripes alternately arranged.

When a user touches the cover 801 with his finger, the pressure sensing layer 803 will be slightly deformed, and the line length of the pressure sensing electrode 8031 of the corresponding touch area 805 will be changed (due to being pressed), thereby affecting the equivalent resistance of the pressure sensing electrode 8031. Therefore, when the force of the touch is different, the pressure sensing electrode 8031 will generate different resistance changes. If the touch force is large, the resistance of the pressure sensing electrode 8031 has large variation; conversely, if the force of the touch is small, the resistance of the pressure sensing electrode 8031 has a small variation. Therefore, by measuring the resistance change of the pressure sensing electrode 8031, the touch force can be determined.

Since the pressure sensing electrode 8031 is typically made of the same material, an important parameter to be considered in the material selection of the pressure sensing electrode 8031 is the strain Factor (GF) of the material. The strain Factor (GF) of the material is calculated as follows:

GF＝(ΔR/R)/(ΔL/L)；

wherein R is the equivalent resistance of the conductive material when the conductive material is not touched, deltaR is the resistance variation of the conductive material after touched, L is the line length of the conductive material when the conductive material is not touched, deltaL is the line length variation of the conductive material after touched. In one embodiment, the strain factor GF of the conductive material is greater than 0.5 for better sensitivity for better detection of the magnitude of Δr.

Since the pressure sensing electrode 8031 of the above example is in the form of an elongated wire, the change in Δr is mainly dependent on Δl. However, when the pressure sensing electrode 8031 is formed in a square, oval, or other irregular pattern having a small aspect ratio, the change in Δr will depend mainly on the amount of deformation of the pressure sensing electrode 8031, not just on Δl alone.

Referring to fig. 3, the pressure sensing device 10 of the first embodiment of the present invention includes a substrate 103 and a conductive pattern layer 109, the substrate 103 includes a first surface 1031 and a second surface 1033, the first surface 1031 and the second surface 1033 are opposite to each other, and the conductive pattern layer 109 is directly formed on the first surface 1031 for sensing the magnitude of the touch force.

Referring to fig. 4, the conductive pattern layer 109 includes three identical pressure sensing electrodes 1097 arranged in a 1×3 array, only a small number of pressure sensing electrodes 1097 are listed here by way of illustration, and in an actual product, the number of pressure sensing electrodes 1097 may be more, the arrangement may be rectangular n×m (N and M are positive integers greater than 0) array arrangement, or a circumferential array arrangement with a radius R (R is positive integer greater than 0), or a combination of the two or other irregular arrangements. The pressure-sensitive electrode 1097 is an elongated wire, and has a maximum length in the X, Y direction and a width of 10mm or less, preferably 5mm or less.

Each pressure sensing electrode 1097 is configured with a pressure sensing electrode signal line 1065, the pressure sensing electrode signal line 1065 includes a transmitting line 1067 and a receiving line 1069, the transmitting line 1067 is lapped to one end portion of the pressure sensing electrode 1097, the receiving line 1069 is lapped to the other end portion of the pressure sensing electrode 1097, the transmitting line 1067 and the receiving line 1069 are simultaneously connected to the connection pad 1081 in a conducting manner, and the connection pad 1081 is used for connecting the detection chip 108. The transmitting line 1067, the pressure sensing electrode 1097, and the receiving line 1069 form a conductive loop for detecting the resistance change of the pressure sensing electrode 1097, and the resistance change is transmitted to the detecting chip 108 for processing. The distribution area of the pressure sensing electrodes 1097 and the distribution area of the signal lines constitute a pressure sensing area 111 as shown.

However, since the transmitting line 1067 and the receiving line 1069 are partially exposed above the display area of the display device when the pressure sensing apparatus 10 is coupled to the display device, the transmitting line 1067 and the receiving line 1069 are required to have light-transmitting and conductive properties. Meanwhile, since the pressure sensing electrode signal line 1065 needs to detect the amount of change in resistance, metal will be the preferred material for the transmitting line 1067 and the receiving line 1069. Because the resistance of the pressure sensing electrode 1097 is slightly changed before and after the pressing, if metal conduction is used, the signal attenuation problem caused by the self resistance of the pressure sensing electrode signal line 1065 can be effectively avoided in the signal transmission process due to the low metal resistance. The conductive wire can be a metal simple substance with excellent conductivity such as gold, silver, copper, aluminum, molybdenum, iron and the like or a composite material thereof such as conductive wire made of molybdenum-aluminum-molybdenum. When a metal is selected as the transmission line 1067 and the reception line 1069, the signal transmission performance is optimized, but the visibility is deteriorated due to the poor light transmittance of the metal while blocking the display effect of the lower display module. To solve this problem, please refer to fig. 5A.

The transmitting line 1067 and the receiving line 1069 are designed as hollow structures, and the receiving line 1069 is taken as an example for illustration, and the longitudinal section of the line body is a rectangle with an aspect ratio greater than 1, even greater than 10. The wire body is internally provided with a hollowed-out area 1068, and the hollowed-out area 1068 is formed by arranging a plurality of diamond-shaped non-conductive blank areas at intervals. The metal cell lines 1062 remaining after the hollowing out are connected in a diamond-shaped grid-like cross conduction manner to form a conductive grid 1064. Wherein the area of the hollowed-out area 1068 in unit length is more than or equal to 40% of the longitudinal section area of the signal line body; the line width of the metal element line 1062 is less than 10 μm, preferably less than 5 μm. In the figure, at least two bonding points 1066 are formed on any one metal unit line 1062, so as to prevent the connection failure caused by the interruption of part of the metal unit lines 1062 during the etching process.

Referring to fig. 5B, the hollow structures of the transmitting line 1067 and the receiving line 1069 may also be tree structures, and the receiving line 1069 is taken as an example for illustration, in the figure, at least two lap points 1066 are formed on any one metal unit line 1062, so as to prevent the connection failure caused by the interruption of part of the metal unit line 1062 in the etching process.

Referring to fig. 5C, the hollow structures of the transmitting line 1067 and the receiving line 1069 may also be a loop-around structure, and the receiving line 1069 is illustrated as an example, in which at least two lap points 1066 are formed on any one metal unit line 1062, so as to prevent the connection failure caused by the interruption of part of the metal unit line 1062 in the etching process.

Referring to fig. 6A, the main difference between the second embodiment and the first embodiment is that the conductive pattern layer 209 includes three rows of nine pressure sensing electrodes 2097 arranged in parallel and arrayed in a 3×3 manner. The three pressure sensing electrodes 2097 of each row are connected to a transmitting line 2067 and a receiving line 2069, and the pressure sensing electrodes 2097 in the middle are directly connected to the pressure sensing electrodes 2097 on both sides.

Referring to fig. 6B, the main difference between the third embodiment and the first embodiment is that the conductive pattern layer 309 includes three rows of nine pressure sensing electrodes 3097 arranged in parallel and arrayed in a 3×3 manner. The nine pressure-sensitive electrodes 3097 are connected in a serpentine, circumferentially conductive manner via only one transmitting line 3067 and one receiving line 3069. Compared with the first embodiment, the present embodiment and the second embodiment require fewer detection circuits for detecting the resistance change, and can greatly reduce the circuit layout area of all the detection circuits and the control circuits corresponding to the pressure sensing electrode 3097.

Referring to fig. 7, the main difference between the fourth embodiment of the present invention and the first embodiment is that the conductive pattern layer 409 includes three conductive electrodes 4091 arranged in a 1×3 array, and only a small number of conductive electrodes 4091 are illustrated in a schematic manner. Any of the conductive electrodes 4091 includes a first direction touch electrode 4093, a second direction touch electrode 4095 and a pressure sensing electrode 4097, which are complementary and spliced to form a rectangular conductive pattern. The first direction touch electrode 4093 is radially disposed inside the corresponding second direction touch electrode 4095 having a radial inner space, the first direction touch electrode 4093 includes a plurality of touch electrode protrusions 4092 and a touch electrode sphere 4094 disposed in the middle portion, and each touch electrode protrusion 4092 is disposed in a divergent manner around the touch electrode sphere 4094, and the intervals between the touch electrode protrusions may be different or the same. A plurality of touch electrode grooves 4096 are formed inside the second direction touch electrode 4095. By such arrangement, cross complementation of the first direction touch electrode 4093 and the second direction touch electrode 4095 is realized in shape, and touch electrodes in different directions are arranged on one surface of the substrate 103. The number of the touch electrode protrusions 1092 is not limited to seven in the drawing, and may be any number greater than 2.

The pressure sensing electrodes 4097 enter from one side of each conductive electrode 4091, pass through a space formed by the cross complementation of the first direction touch electrode 4093 and the second direction touch electrode 4095, and finally are led out from the other side of each conductive electrode 4091, and the pressure sensing electrodes 4097 are arranged between the first direction touch electrode 4093 and the second direction touch electrode 4095. Thus, the three conductive electrodes are not overlapped with each other, so as to realize electrical insulation. . In implementation, the projections of the first direction touch electrode 4093 and the second direction touch electrode 4095 and the pressure sensing electrode 4097 in the vertical direction are not overlapped. More preferably, the first direction touch electrode 4093, the second direction touch electrode 4095 and the pressure sensing electrode 4097 are completely complementary to each other, so as to form a single-layer conductive pattern layer 409 which is not overlapped with each other. The complementary design is formed on the shape, so that a splicing gap is not seen visually, and the electrode pattern is small in visibility. The pressure-sensitive electrode 4097 is an elongated wire, and has a maximum length in the X, Y direction and a width of 10mm or less, preferably 5mm or less.

Each of the first direction touch electrodes 4093 is configured with a first direction touch electrode signal line 4061, and transmits the signal scanned by the first direction touch electrode 4093 to the detection chip 408. The first direction touch electrode signal line 4061 is electrically connected to the peripheral edge of the first direction touch electrode 4093. The first direction touch electrode signal line 4061 may have transparent and conductive properties, and may be any one or a combination of metal oxide materials such as ITO, IZO, etc., nano silver wire, nano copper wire, graphene, polyaniline, or other conductive polymer materials. But also metallic conductive materials such as gold, silver, copper, aluminum, molybdenum, iron, molybdenum-aluminum-molybdenum, etc.

Each second direction touch electrode 4095 is equipped with a second direction touch electrode signal line 4063, and the signal scanned by the second direction touch electrode 4095 is transmitted to the detection chip 408. The second direction touch electrode signal line 4063 is electrically connected to the peripheral edge of the second direction touch electrode 4095. The second direction touch electrode signal line 4063 may have transparent and conductive properties, and may be any one or combination of metal oxide materials such as ITO, IZO, etc., nano silver wire, nano copper wire, graphene, polyaniline, or other conductive polymer materials. But also metallic conductive materials such as gold, silver, copper, aluminum, molybdenum, iron, molybdenum-aluminum-molybdenum, etc.

The transmitting line 4067 and the receiving line 4069 of each pressure sensing electrode 4097 are the same as those of the embodiment.

The first direction touch electrode signal line 4061 and the second direction touch electrode signal line 4063 may be hollow-out metal wires with the same material, structure and shape as the sending wire 4067 and the receiving wire 4069; transparent conductive materials different from the transmission line 4067 and the reception line 4069 may also be used.

Referring to fig. 8, the main difference between the fifth embodiment and the first embodiment is that the conductive pattern layer 509 includes a pressure sensing region 511 and a connection region 515, and a transition region 513 is disposed between the pressure sensing region 511 and the connection region 515. Three conductive electrodes 5091 arranged in a 1×3 array and corresponding signal lines are disposed in the pressure sensing area 511. The connection area 515 includes a plurality of connection pads 5081, each connection pad 5081 is directly connected to each pressure sensing signal line 5065 or the first direction touch electrode signal line 5061 or the second direction touch electrode signal line 5063, and the connection area 515 extends out of the pressure sensing area 511, and the pressure sensing area 511 does not need to be separately provided with a binding area. By the arrangement, the pressure sensing area 511 and the connecting area 515 can be integrally arranged in the same plane, so that the problem that the binding area of the pressure sensing area 511 is increased due to excessive signal lines can be effectively solved, the manufacturing process is simplified, and the cost is reduced.

Referring to fig. 9, during the manufacturing and use process, the connection area 515 is bent multiple times, so that the transition area 513 between the connection area 515 and the pressure sensing area 511 is easily broken. In order to improve the bending strength of the signal line in the transition region 513, the signal line in the transition region 513 is widened in this embodiment. The average width of the same signal line in the transition region 513 is 2 to 10 times, preferably 3 to 6 times, the width of the signal line in the pressure sensing region 511 or the connection region 515. The widening may be gradual widening, and the gradual widening gradually widens from the upper end and the lower end of the transition area 513 to the middle part, and in the case of uniform gradual widening, the longitudinal center position of the transition area 513 is the maximum width. Of course, the widening design of the transition area 513 mainly solves the problem of bending resistance and breaking resistance, the widening mode and widening size can be other uniform and nonuniform gradual change designs, the constant width size design, the upper width is larger than the lower width, the middle width is slightly smaller than the two end widths and other deformation modes, so long as the bending resistance of the transition area 413 can be improved.

Referring to fig. 10, the main difference between the sixth embodiment and the fifth embodiment of the present invention is that the conductive electrode 6091 of the conductive pattern layer 609 includes a plurality of first direction touch electrodes 6093 and the same number of second direction touch electrodes 6095, and a pressure sensing electrode 6097. The first direction touch electrode 6093 and the second direction touch electrode 6095 are right triangle and have the same area, the first direction touch electrode 6093 comprises a first direction touch electrode hypotenuse portion 6098, and the second direction touch electrode 6095 comprises a second direction touch electrode hypotenuse portion 6099. The first direction touch electrode 6093 and the second direction touch electrode 6095 are also disposed to cross each other, and the pressure sensing electrode 6097 is disposed in a space formed by the crossing of the first direction touch electrode hypotenuse portion 6098 and the second direction touch electrode hypotenuse portion 6099.

Each first direction touch electrode 6093 is matched with a first direction touch electrode signal line 6061, each second direction touch electrode 6095 comprises a second direction touch electrode signal line 6063, the pressure sensing electrode 6097 is matched with a sending line 6067 and a receiving line 6069, the sending line 6067 is conducted to a starting end of the pressure sensing electrode 6097 arranged on the connecting curve, and the receiving line 6069 is conducted to a terminating end of the pressure sensing electrode 6097 arranged on the connecting curve. The transmitting line 6067 and the receiving line 6069 of the present embodiment are made of the same material, have the same structure, and have the same shape as the first touch electrode signal line 6061 and the second touch electrode signal line 6063, and are all metal signal lines with hollow structures, as shown in fig. 5A, 5B, and 5C. Therefore, three types of signal wires can be formed through sputtering and yellow light processes in one manufacturing process, the manufacturing process is simplified, and the cost is saved.

Referring to fig. 11A, the seventh embodiment of the present invention is mainly different from the first embodiment in the trace shape of the signal line 706 of the conductive pattern layer 709. The signal line 706 led out from the conductive electrode 7091 is connected to the inside of the detection chip 708 in a substantially "Z" shape. Because the pixels of the display module are arranged in an array type transverse and longitudinal arrangement mode, the signal lines 706 are made of metal materials, and have poor light transmittance, and if the arrangement mode of the transverse and longitudinal arrangement mode is also adopted, dark stripes can appear in the whole transverse or longitudinal display, so that the visibility is affected. Therefore, the "Z" wiring mode is adopted instead of the "L" wiring mode in the first embodiment, so that the problem of dark stripes can be effectively avoided, and the problem of visibility of the signal line 706 caused by light interference can be effectively reduced.

Referring to fig. 11B, the eighth embodiment of the present invention is mainly different from the first embodiment in the trace shape of the signal line 806 of the conductive pattern layer 809. The signal line 806 led out from the conductive electrode 8091 is routed in a substantially "S" shape. The problem to be solved and the effect to be produced are the same as those of the seventh embodiment.

In addition, the trace of the signal line 806 may be in other regular or irregular curve trace forms, which can solve the problem of dark stripes.

Referring to fig. 12, a ninth embodiment of the present invention provides a method for manufacturing a pressure sensing device 10, and the original components and labels of the pressure sensing device 10 of the fourth embodiment are applicable to the following manufacturing method embodiments, and the method includes the following steps:

s11: a transparent substrate 103 is provided. The substrate 103 may be a rigid substrate such as glass, tempered glass, sapphire glass, etc.; also flexible substrates such as PEEK (polyetheretherketone), PI (Polyimide), PET (polyethylene terephthalate ), PC (polycarbonate), PES (polyethylene glycol succinate, polyethylene succinate), PMMA (polymethyl methacrylate), PVC (Polyvinyl chloride ), PP (Polypropylene) and composites of any two thereof are possible.

S12: a transparent conductive pattern layer 109 is formed on one surface of the substrate 103. The material of the conductive pattern layer 109 is any one or a combination of metal oxide materials such as ITO, IZO, etc., nano silver wires, nano copper wires, graphene, polyaniline, or other conductive polymer materials.

S13: a metal pressure-sensitive electrode signal line 1065 overlapping the conductive pattern layer 109 is formed. A metal layer is sputtered outside the conductive pattern layer 109, and a metal pressure sensing electrode signal line 1065 is formed through a yellow light process, and the pressure sensing electrode signal line 1065 is in a hollow structure.

S14: an insulating protective layer is provided on the conductive pattern layer 109 and the pressure-sensitive electrode signal line 1065. The conductive pattern layer 109 and the pressure-sensitive electrode signal line 1065 formed on the substrate 103 are protected from external damage.

Compared with the prior art, the pressure sensing device 40 integrates the pressure sensing electrode 4097, the first direction touch electrode 4093 and the second direction touch electrode 4095 on the same basic same plane, and the pressure sensing electrode 4097, the first direction touch electrode 4093 and the second direction touch electrode 4095 adopt complementary non-overlapping shape designs during integration, so that compared with the traditional structure of externally attaching the pressure sensing device to a touch screen, the pressure sensing device has lower thickness and lower cost, and solves the problem of visibility of a signal line while reducing the thickness of a panel.

The first embodiment uses the metal pressure sensing electrode signal line 1065 to conduct signals, and the metal resistance is low, so that the signal attenuation problem caused by self resistance can be effectively avoided in the signal transmission process. However, when the pressure sensing device 10 is used in combination with the display module, the pressure sensing electrode 1097 and the signal line are required to have light transmittance, so that the problem of shielding the display module from vision cannot be caused. Because the light transmittance of the metal is relatively poor, the pressure sensing electrode signal wire 1065 is hollowed out, so that the problem of visual blocking of the pressure sensing electrode signal wire 1065 to the lower display module can be solved, and the excellent signal conduction characteristic of the metal can be maintained. The hollow shape adopts the shapes of grid, tree, loop back and the like, and ensures that each metal unit line 1062 has at least two lap points 1066, thereby effectively preventing the problem of poor connection caused by broken lines.

The connection area 515 and the pressure sensing area 511 of the invention are integrally designed, and the binding area and the FPC are not required to be independently manufactured in the pressure sensing area for binding, so that the problem of the increase of the binding area caused by excessive signal wires can be effectively solved, the manufacturing process is simplified, and the cost is reduced.

In some embodiments of the present invention, the signal lines in the transition region 513 are designed to be gradually widened, so that the bending resistance of the signal can be enhanced. In other embodiments, the wiring shape of the signal line is changed from an "L" shape to a "Z" shape, an "S" shape, or an irregular curve, so as to effectively reduce the problem of the signal line being visible due to light interference, and avoid the problem that the signal line shields the display pixels.

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

Claims

1. A pressure sensing device, comprising:

the substrate comprises a first surface and a second surface, and the first surface and the second surface are oppositely arranged;

the conductive pattern layer is arranged on the first surface and comprises a plurality of pressure sensing electrodes, and the touch force is sensed by the resistance change of the pressure sensing electrodes; a kind of electronic device with high-pressure air-conditioning system

The pressure sensing signal wire is used for conducting and connecting the pressure sensing electrode to a detection chip, and the pressure sensing signal wire is of a hollowed-out structure;

the pressure sensing signal wire is hollowed out to form a hollowed-out area and a plurality of metal unit wires, and the number of lap joints on any metal unit wire is at least two.

2. The pressure sensing apparatus of claim 1, wherein: the pressure sensing signal wire is a metal wire.

3. The pressure sensing apparatus of claim 1, wherein: the area of the hollowed-out area of the pressure sensing signal wire with unit length after being hollowed-out is larger than or equal to 40% of the area of the pressure sensing signal wire body.

4. A pressure sensing apparatus as defined in claim 3, wherein: the metal unit wire is any one or combination of grid, tree, loop, and its line width is less than 10 μm.

5. The pressure sensing apparatus of claim 1, wherein: the pressure sensing signal wire is in an S shape, Z shape or irregular curve shape.

6. The pressure sensing apparatus of any one of claims 1-5, wherein: the conductive pattern layer further comprises a plurality of first-direction touch electrodes and a plurality of second-direction touch electrodes, the first-direction touch electrodes and the second-direction touch electrodes are used for detecting touch positions, the first-direction touch electrodes, the second-direction touch electrodes and the pressure sensing electrodes are electrically insulated from each other, and projections in the vertical direction are not overlapped.

7. The pressure sensing apparatus of claim 6, wherein: each first-direction touch electrode is connected with a first-direction touch electrode signal wire in a conducting manner, each second-direction touch electrode is connected with a second-direction touch electrode signal wire in a conducting manner, and the materials, structures and shapes of the first-direction touch electrode signal wire and the second-direction touch electrode signal wire are the same as those of the pressure sensing signal wire.

8. The pressure sensing apparatus of claim 6, wherein: each first-direction touch electrode is connected with a first-direction touch electrode signal wire in a conducting manner, each second-direction touch electrode is connected with a second-direction touch electrode signal wire in a conducting manner, and the materials and structures of the first-direction touch electrode signal wire and the second-direction touch electrode signal wire are different from those of the pressure sensing signal wire.

9. The pressure sensing apparatus of any one of claims 1-5, wherein: the pressure sensing area is internally provided with a conductive pattern layer and a pressure sensing signal wire, the connecting area is internally provided with a pressure sensing signal wire and a connecting pad, and the pressure sensing signal wire is integrally connected with the conductive pattern layer of the pressure sensing area and the connecting pad of the connecting area.

10. The pressure sensing apparatus of claim 9, wherein: the touch control device further comprises a transition area, wherein the transition area is positioned between the touch control sensing area and the connecting area, the width of a pressure sensing signal wire in the transition area is widened, and the width of the pressure sensing signal wire in the transition area is 2-10 times of the width of the pressure sensing signal wire in the pressure sensing area.