CN107300436A - Touch control display apparatus and its pressure sensor - Google Patents
Touch control display apparatus and its pressure sensor Download PDFInfo
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- CN107300436A CN107300436A CN201710587383.0A CN201710587383A CN107300436A CN 107300436 A CN107300436 A CN 107300436A CN 201710587383 A CN201710587383 A CN 201710587383A CN 107300436 A CN107300436 A CN 107300436A
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- lead
- sensitive grid
- pressure sensor
- wheatstone bridge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
- G01L1/225—Measuring circuits therefor
- G01L1/2262—Measuring circuits therefor involving simple electrical bridges
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The present invention relates to a kind of touch control display apparatus and its pressure sensor.The pressure sensor includes base material and sensing unit.Base material includes relative first surface and second surface；Sensing unit includes four resistance identical sensitive grids and four leads, four sensitive grids, which join end to end, constitutes four nodes of a Wheatstone bridge and formation, four leads are connected with four nodes respectively, wherein, Wheatstone bridge is on first surface, in four leads of sensing unit, at least one lead is located at first surface, and at least one lead is located at second surface.The pressure sensor has the characteristics of detection accuracy is preferable.
Description
Technical field
The present invention relates to technical field of touch-control display, more particularly to a kind of touch control display apparatus and its pressure sensor.
Background technology
With increasingly popularization of the touch control display apparatus such as touch-screen mobile phone, pressure biography is added on touch control display apparatus
Sensor, can make touch control display apparatus experience the pressing dynamics of operator, widen the interactivity of man-machine interface, enhanced use
The usage experience at family.With continuing to develop for modernization industrial technology, various types of pressure sensing technologies are applied aobvious to touch-control
In showing device, but most pressure sensing technologies all detect pressure with the deformation of Z-direction, and the deformation of Z-direction can be to display
Screen part is directly extruded, and application for a long time may influence display screen to show.Detected with the deformation in X/Y plane pressure/
The problem of deformation that the pressure sensing technology of pulling force can be prevented effectively from Z-direction is directly extruded display screen part, but it is existing
What is had detects that the accuracy of the signal detection of the pressure sensing technology of pressure/pulling force is poor with the deformation in X/Y plane.
The content of the invention
Based on this, it is necessary to provide a kind of preferable touch control display apparatus of detection accuracy and its pressure sensor.
A kind of pressure sensor, including：
Base material, including relative first surface and second surface；
Sensing unit, including four resistance identical sensitive grids and four leads, four sensitive grids join end to end
Constitute a Wheatstone bridge and form four nodes, four leads are connected with four nodes respectively, wherein, it is described
Wheatstone bridge is on the first surface, in four leads of the sensing unit, at least one lead
Located at the first surface, and at least one lead is located at the second surface.
In above-mentioned sensing unit, lead is connected with node, namely lead is outside Wheatstone bridge, is not belonging to favour stone electricity
A part for bridge.And in four leads of each sensing unit, part lead is located on first surface, and part lead is located at
On second surface, relative to the same surface that all leads are all located at base material, the area for lead cabling is added, from
And the larger lead of line width can be used, reduce the resistance of lead.So the overall change in resistance amount of lead will be much smaller than sensitivity
The change in resistance amount (one thousandth rank) of grid.During pressing, although change in resistance can also occur for wire squass, because lead exists
Outside Wheatstone bridge, and the special deformation form of lead so that output signal influence of the lead on Wheatstone bridge is much smaller than
One thousandth semaphore rank, therefore above-mentioned pressure sensor has the characteristics of detection accuracy is good.
In one of the embodiments, the size of the Wheatstone bridge is 0.49cm2To 25cm2.Also i.e. by favour this
Energization bridge is built in the area of very little, so as to set greater number of Wheatstone bridge in unit area, so that pressure
The characteristics of force snesor has high-res and high sensing precision.
In one of the embodiments, the line width of the sensitive grid is preferably 0.005mm to 2.5mm.The line width of sensitive grid
It is too small, it is high to technological requirement, process costs can be increased and cause product yield low, and the line width of sensitive grid is too big, sensitive grid
Resistance can diminish, the ratio that change in resistance caused by wire squass accounts for change in resistance caused by sensitive grid deformation can be increased, no
Beneficial to the true response obtained to deformation.The line width of sensitive grid is preferably that 0.005mm to 2.5mm can meet the requirement of manufacture craft
And can be beneficial to obtain the true response to deformation.
In one of the embodiments, the resistance of the sensitive grid is 120 Ω to 20M Ω.The resistance of sensitive grid is larger, can
To improve detection accuracy.
In one of the embodiments, four sensitive grids be respectively head and the tail be sequentially connected the first sensitive grid, second
Sensitive grid, the 3rd sensitive grid and the 4th sensitive grid；
First sensitive grid is first node, second sensitive grid with the node that second sensitive grid is connected to form
The node being connected to form with the 3rd sensitive grid is Section Point, and the 3rd sensitive grid is connected shape with the 4th sensitive grid
Into node be the 3rd node, the node that the 4th sensitive grid and first sensitive grid are connected to form is fourth node；
The lead being connected with the first node is the first lead, and the lead being connected with the Section Point is
Second lead, the lead being connected with the 3rd node is the 3rd lead, the lead being connected with the fourth node
For the 4th lead；
First lead is located at the first surface, second lead and the 4th lead with the 3rd lead
Located at the second surface.Two leads are located at first surface, and two leads are located at second surface, namely four leads divide equally in
On first surface and second surface, so that the line width of the upper lead on two surfaces can be simultaneously wider, and just
It is integrated in circuit.
In one of the embodiments, first sensitive grid is identical with the direction of the 3rd sensitive grid, and described second
Sensitive grid is identical with the direction of the 4th sensitive grid, and the direction of first sensitive grid and the direction of second sensitive grid
Vertically.The setting of the direction of four sensitive grids of above-mentioned Wheatstone bridge, can make it that the cabling of sensitive grid is highly integrated, to carry
The detection accuracy of high sensing unit, and it is easy to the realization of manufacture craft.
In one of the embodiments, first lead and the 3rd lead are respectively used to and ground wire and supply voltage
Connection, second lead and the 4th lead are used to be connected with detection circuit to detect the bridge electricity of the Wheatstone bridge
Pressure.Lead for being connected with ground wire or supply voltage can merge, namely when pressure sensor includes multiple sensing units,
Several sensing units, which can share same, is used for the lead that is connected with ground wire or supply voltage, now, for ground wire or
The lead and Wheatstone bridge of supply voltage connection are located at same surface, more conducively simplify manufacture craft.
In one of the embodiments, the number of the sensing unit is multiple, the favour of multiple sensing units
Stone electric bridge is intervally arranged；
The pressure sensor also includes the ground lead and power supply lead wire located at the first surface, the ground lead
It is respectively used to be connected with the ground wire and the supply voltage with the power supply lead wire, the first of several sensing units draw
Line is connected with the same ground lead, and the 3rd lead of several sensing units connects with the same power supply lead wire
Connect.The number of ground lead and power supply lead wire is reduced, so as to which ground lead and power supply lead wire are made into wide, reduction connects
The resistance of ground lead and power supply lead wire, so as to reduce ground lead and change in resistance caused by power supply lead wire deformation, further subtracts
Influence of the small ground lead with change in resistance caused by power supply lead wire deformation to detection structure, obtains the true response to deformation.
In one of the embodiments, the Wheatstone bridge of multiple sensing units is arranged in some rows, described
A row institute is pressed from both sides between ground lead and the staggered and adjacent ground lead of the power supply lead wire and the power supply lead wire
State Wheatstone bridge；
Wherein, the ground lead between Wheatstone bridge described in adjacent two row simultaneously with favour stone described in two rows
First lead connection of electric bridge, the power supply lead wire between Wheatstone bridge described in adjacent two row simultaneously with two rows
The 3rd lead connection of the Wheatstone bridge, positioned at Wheatstone bridge described in the outermost ground lead and a row
First lead connection, positioned at the 3rd lead of Wheatstone bridge described in the outermost power supply lead wire and a row
Connection.The number of ground lead and power supply lead wire can be further reduced, ground lead and power supply lead wire deformation is further reduced
Influence of the caused change in resistance to detection structure, obtains the true response to deformation.
In one of the embodiments, the base material includes connected center and marginal zone, the Wheatstone bridge position
In the center；
Lead on the second surface includes the linkage section being connected and walks line segment, and the linkage section is walked away from described in
One end of line segment is connected with the node on the first surface, and the cabling section is located at the marginal zone, the company
The line width for connecing section is more than the line width of the sensitive grid.The line width of linkage section is more than the line width of sensitive grid, namely is less than using resistance
The linkage section of the resistance of sensitive grid, can reduce change in resistance caused by wire squass, further reduce and hindered caused by wire squass
Influence of the value changes to detection structure, obtains the true response to deformation.
In one of the embodiments, the line width of the linkage section is 0.1mm to 5mm.Within the specific limits, linkage section
Line width is smaller, and the increased amplitude of resistance of linkage section is bigger, and the line width of linkage section is bigger, and the amplitude of the resistance reduction of linkage section subtracts
It is small, consider the influence and material cost of the line width of linkage section to the resistance of linkage section, the line width of linkage section is set to
0.1mm to 5mm.
In one of the embodiments, the base material is provided with through the logical of the first surface and the second surface
Conductive material is equipped with hole, the through hole, described conductive material one end connects with the lead on the second surface
Connect, the other end is connected with node described in one on the first surface.By opening up through hole, conduction material is filled in through hole
Material forms the mode of conductor wire, to cause the node positioned at different surfaces to be connected with lead.
A kind of touch display unit, including above-mentioned pressure sensor
Brief description of the drawings
Fig. 1 is the top view of the first surface of the pressure sensor of an embodiment；
Fig. 2 is the top view of the second surface of the pressure sensor of an embodiment；
Fig. 3 be Fig. 1 in Wheatstone bridge structural representation；
Fig. 4 be another embodiment in Wheatstone bridge structural representation；
Fig. 5 is the top view on a surface of the base material with conductor wire；
Fig. 6 is the profile of the pressure sensor of an embodiment.
Embodiment
Below in conjunction with the accompanying drawings and touch control display apparatus and its pressure sensor are further described specific embodiment.
As shown in figure 1, the pressure sensor 10 of an embodiment includes base material 100 and the sensing list on base material 100
Member 200.After sensing unit 200 is connected with detection circuit, during pressing, sensing unit 200 includes a full-bridge being made up of sensitive grid
Strain Meter Set, its sensitive gate resistance changes after stress is deformed upon so that output signal (electric current, electricity of sensing unit 200
The electric signals such as pressure) change, circuit is by the capture to electric signal and analyzes and processes for detection, you can pressure signal is entered
Row detecting.
As shown in Figure 1 to Figure 3, base material 100 includes relative first surface 110 and second surface 120.Sensing unit 200
Including four resistance identical sensitive grids 210 and four leads 220, four sensitive grids 210 join end to end one favour of composition this
Energization bridge 200a simultaneously forms four nodes 230, and four leads 220 are connected with four nodes 230 respectively.Wherein, Wheatstone bridge
200a is on the first surface 110, in four leads 220 of each sensing unit 200, and at least one lead 220 is located at the
One surface 110, and at least one lead 220 is located at second surface 120.
In traditional pressure sensor, four sensitive grids are set on whole face base material, each sensitive grid is drawn by two
Line leads to the edge of base material, then does Wheatstone bridge and build, and lead is a part for Wheatstone bridge.During pressing, lead
Can occur change in resistance, due to the part that lead is Wheatstone bridge, the change in resistance that lead occurs can have a strong impact on telecommunications
Number, cause signal detection to be forbidden, it is impossible to obtain the true response to deformation.And in traditional pressure sensor, four quick
Sense grid and lead corresponding with four sensitive grids are respectively positioned on the same surface of base material, cause base material not have enough cabling areas,
Common practice is that using the narrower lead of line width, and the resistance of the narrower lead of line width is larger, resistance caused by wire squass
Change influences to increase on the output signal of sensitive grid, causes signal detection to be forbidden, it is impossible to obtain the true response to deformation.
And in above-mentioned sensing unit 200, lead 220 is connected with node 230, namely lead 220 is in Wheatstone bridge
Outside 200a, a Wheatstone bridge 200a part is not belonging to.And in four leads 220 of each sensing unit 200, part
Lead 220 is located on first surface 110, and part lead 220 is located on second surface 120, relative to all positions of lead 220
In the same surface of base material 100, the area for the cabling of lead 220 is added, so as to use the larger lead of line width
220, reduce the resistance of lead 220.So the overall change in resistance amount of lead 220 will be much smaller than the change in resistance of sensitive grid 210
Measure (one thousandth rank).During pressing, although change in resistance can also occur for the deformation of lead 220, because lead 220 is in favour stone
Outside electric bridge 200a, and the special deformation form of lead 220 so that lead influences remote to Wheatstone bridge 200a output signal
Less than one thousandth semaphore rank, therefore above-mentioned pressure sensor 10 has the characteristics of detection accuracy is good.
Further, in the present embodiment, Wheatstone bridge 200a size is 0.49cm2To 25cm2.Also will
Wheatstone bridge 200a is built in the area of very little, so as to set greater number of Wheatstone bridge in unit area
200a, so that the characteristics of pressure sensor 10 has high-res and high sensing precision.
Further, in the present embodiment, the resistance of sensitive grid 210 is 120 Ω to 20M Ω.The resistance of sensitive grid 210 compared with
Greatly, detection accuracy can be improved.It is preferred that, in the present embodiment, the resistance of sensitive grid 210 is 1K Ω to 500K Ω, energy
Avoid because resistance is excessive and produces the heat of excess and thermal deformation phenomenon occurs during the work of sensitive grid 210, and then influence detection accurate
The problem of true property.
Further, in the present embodiment, Wheatstone bridge 200a size is preferably 1.00cm2To 9.00cm2。
Wheatstone bridge 200a area is too small, high to technological requirement, can increase process costs and cause product yield low, and favour this
Energization bridge 200a area is too big, it is impossible to the Wheatstone bridge 200a of enough quantity is set in limited space, and then
The requirement of high-res and high sensing precision can not be met.Wheatstone bridge 200a size is preferably 1.00cm2Arrive
9.00cm2, so as to be balanced in manufacture craft, high-res and high sensing precision.Specifically, in present embodiment
In, Wheatstone bridge 200a is square, when Wheatstone bridge 200a areas are 0.49cm2When, Wheatstone bridge 200a size
For 0.7cm*0.7cm；Similarly, when Wheatstone bridge 200a areas are 25cm2When, Wheatstone bridge 200a size is 5cm*
5cm。
Further, in the present embodiment, the line width of sensitive grid 210 is preferably 0.005mm to 2.5mm.Sensitive grid 210
Line width is too small, high to technological requirement, can increase process costs and cause product yield low, and the line width of sensitive grid 210 is too big,
The resistance of sensitive grid 210 can diminish, the deformation of lead 220 can be increased caused by change in resistance account for resistance caused by the deformation of sensitive grid 210
The ratio of value changes, is unfavorable for obtaining the true response to deformation.The line width of sensitive grid 210 is preferably 0.005mm to 2.5mm energy
Meet the requirement of manufacture craft and can be beneficial to obtain the true response to deformation.
It should be noted that the total length (area of sensitive grid 210) of the resistance of sensitive grid 210 and sensitive grid 210 and
The line width of sensitive grid 210 is related, can be according to sensitive grid 210 after design determines Wheatstone bridge 200a size
Resistance determines the line width of sensitive grid 210；Similarly, can be according to sensitive grid 210 after design determines the line width of sensitive grid 210
Resistance determine Wheatstone bridge 200a size.
Further, in the present embodiment, the first sensitive grid that four sensitive grids 210 are respectively sequentially connected from beginning to end
210a, the second sensitive grid 210b, the 3rd sensitive grid 210c and the 4th sensitive grid 210d.First sensitive grid 210a and the second sensitive grid
The node that 210b is connected to form is first node 232, the node that the second sensitive grid 210b and the 3rd sensitive grid 210c are connected to form
For Section Point 234, the node that the 3rd sensitive grid 210c and the 4th sensitive grid 210d are connected to form is the 3rd node 236, the 4th
The node that sensitive grid 210d and the first sensitive grid 210a are connected to form is fourth node 238.The lead being connected with first node 232
For the first lead 220a, the lead being connected with Section Point 234 is the second lead 220b, the lead being connected with the 3rd node 236
For the 3rd lead 220c, the lead being connected with fourth node 238 is the 4th lead 220d.Wherein, the first lead 220a and the 3rd
Lead 220c is located at first surface 110, and the second lead 220b and the 4th lead 220d are located at second surface 120.Two leads 220
Located at first surface 110, two leads 220 are located at second surface 120, namely four leads 220 divide equally in first surface 110 with
On second surface 120, so that the line width of the upper lead 200 on two surfaces can be simultaneously wider, and it is easy to line
Road is integrated.
Further, as shown in figure 3, in the present embodiment, the direction of two connected sensitive grids 210 intersects.It is preferred that,
In the present embodiment, the direction of two spaced sensitive grids 210 is identical, and the direction of two connected sensitive grids 210 is hung down
Directly.Specifically, as shown in Figures 3 and 4, the first sensitive grid 210a direction is identical with the 3rd sensitive grid 210c direction, second
Sensitive grid 210b direction is identical with the 4th sensitive grid 210d direction, the first sensitive grid 210a direction and the second sensitive grid
210b direction is vertical, and the 3rd sensitive grid 210c direction is vertical with the 4th sensitive grid 210d direction.Above-mentioned Wheatstone bridge
The setting of the direction of 200a four sensitive grids 210, can make it that the cabling of sensitive grid 210 is highly integrated, single to improve sensing
The detection accuracy of member 200, and it is easy to the realization of manufacture craft.
Specifically, in the present embodiment, in the corresponding rectangular coordinate system of sensing unit 200, four 210 points of sensitive grids
Not Wei Yu rectangular coordinate system first quartile, the second quadrant, third quadrant and fourth quadrant.The sensitive grid 210 of first quartile
Towards with the X-axis of rectangular coordinate system towards identical or vertical.In figure 3, the direction (direction) of the sensitive grid 210 of first quartile with
The X-axis of rectangular coordinate system towards (direction) vertically, in Fig. 4, sit by direction (direction) and the right angle of the sensitive grid 210 of first quartile
The X-axis for marking system is identical towards (direction).So that above-mentioned sensing unit 200 is highly suitable for building square pressure sensing
Device 10.
Further, as shown in Figures 1 and 2, in the present embodiment, the first lead 220a and the 3rd lead 220c is used respectively
It is connected in ground wire (GND) and supply voltage (VDD), the second lead 220b is used to be connected with detection circuit with the 4th lead 220d
To detect Wheatstone bridge 200a bridge voltage.Lead 220 for being connected with ground wire or supply voltage can merge, namely work as
Pressure sensor 10 include multiple sensing units 200 when, several sensing units 200 can share same be used for ground wire or
The lead 220 of supply voltage connection, now, for the lead 220 and Wheatstone bridge 200a being connected with ground wire or supply voltage
Positioned at same surface, more conducively simplify manufacture craft.
Further, in the present embodiment, the number of sensing unit 200 is multiple, the favour stone of multiple sensing units 200
Electric bridge 200a is intervally arranged.Pressure sensor 10 also includes the ground lead 300 and power supply lead wire 400 located at first surface 110,
Ground lead 300 is respectively used to be connected with ground wire and supply voltage with power supply lead wire 400.The first of several sensing units 200
Lead 220a is connected with same ground lead 300, and the 3rd lead 220c and the same power supply of several sensing units 200 draw
Line 400 is connected.First lead 220a of several sensing units 200 shares same ground lead 300, will also distinguish originally
A ground lead 300 is merged into some first lead 220a some ground leads being connected, ground lead is reduced
300 number, so as to which ground lead 300 is made into wide, reduces the resistance of ground lead 300, so as to reduce grounding lead
Change in resistance caused by the deformation of line 300, further reduces shadow of the change in resistance to detection structure caused by the deformation of ground lead 300
Ring, obtain the true response to deformation.Similarly, the 3rd lead 220c of several sensing units 200 and same power supply lead wire
400 connections, can reduce influence of the change in resistance caused by the deformation of power supply lead wire 400 to detection structure, obtain to the true of deformation
Response.
Further, in the present embodiment, the Wheatstone bridge 200a of multiple sensing units 200 is arranged in some rows, connects
Row's favour is accompanied between ground lead 300 and the staggered and adjacent ground lead 300 of power supply lead wire 400 and power supply lead wire 400
Stone electric bridge 200a.Wherein, the ground lead 300 between adjacent two rows Wheatstone bridge 200a simultaneously with two row's favour stones
Electric bridge 200a the first lead 220a connections, power supply lead wire 400 between two row's Wheatstone bridge 200a simultaneously with two rows
Wheatstone bridge 200a the 3rd lead 220c connections, positioned at the outermost row's Wheatstone bridge 200a of ground lead 300 and one
The first lead 220a connections, positioned at the outermost row's Wheatstone bridge 200a of power supply lead wire 400 and one the 3rd lead 220c
Connection.Namely adjacent two rows Wheatstone bridge 200a first node 232 is close to each other, adjacent two rows Wheatstone bridge 200a's
3rd node 236 is close to each other, this arrangement mode, can further reduce the number of ground lead 300 and power supply lead wire 400
Mesh, further reduces influence of the ground lead 300 with change in resistance caused by the deformation of power supply lead wire 400 to detection structure, obtains
True response to deformation.
Further, in the present embodiment, ground lead 300 and power supply lead wire 400 are bearing of trend identical straight line knot
Structure, the first lead 220a is vertical with ground lead 300, and the 3rd lead 220c is vertical with power supply lead wire 400.Straight line is most between 2 points
Short, ground lead 300 and the power supply lead wire 400 of linear structure can cause the length of ground lead 300 and power supply lead wire 400 to use up
May be short, and the first lead 220a is vertical with ground lead 300, the 3rd lead 220c is vertical with power supply lead wire 400, can cause
First lead 220a and the 3rd lead 220c length is as short as possible.And length is shorter, ground lead 300, power supply lead wire 400,
First lead 220a and the 3rd lead 220c resistance is smaller, so as to further reduce ground lead 300, power supply lead wire
400th, change in resistance caused by the first lead 220a and the 3rd lead 220c deformation is obtained to deformation to detecting the influence of structure
True response.Specifically, in the present embodiment, base material 100 is rectangle, the Wheatstone bridge of multiple sensing units 200
Long side arrangements of the 200a along base material 100 is in into some rows, and ground lead 300 and power supply lead wire 400 are the long side along base material 100
The linear structure of extension.
Further, in the present embodiment, ground lead 300 and the first lead 220a is integrally formed, power supply lead wire 400 with
3rd lead 220c is integrally formed.Can be formed simultaneously so as to ground lead 300 and the first lead 220a, power supply lead wire 400 and
3rd lead 220c can be formed simultaneously, more conducively simplify manufacture craft.It is preferred that, in the present embodiment, ground lead 300
Line width it is identical with the first lead 220a line width, the line width of power supply lead wire 400 is identical with the 3rd lead 220c line width so that
Manufacture craft can further be simplified.Further, it is preferred that the line width of ground lead 300 and the line width phase of power supply lead wire 400
Together, manufacture craft is simplified so as to further.
Further, in the present embodiment, base material 100 includes connected center 130 and marginal zone 140, marginal zone 140
Including connected routing region 142 and binding region 144, Wheatstone bridge 200a is located at center 130.Pressure sensor 10 is also
Including being grounded ground connection line segment 500 and power supply line segment 600 located at routing region 142, ground connection one end of line segment 500 and ground lead
300 connections, the other end is located at binding region 144, and the one end of power supply line segment 600 is connected with power supply lead wire 400, and the other end is located at binding
Region 144.Wherein, the line width of ground connection line segment 500 is less than the line width of ground lead 300, and the line width of power supply line segment 600 is less than power supply
The line width of lead 400.It is grounded line segment 500 and is located at marginal zone 140 with power supply line segment 600, and when pressing, the deformation of marginal zone 140
The far smaller than deformation of center 130, therefore use the 600 pairs of inspections of the relative less ground connection line segment 500 of line width and power supply line segment
The influence for surveying result is smaller.And because a plurality of ground connection line segment 500 and power supply line segment 600 are intended to be collected to by routing region 142
Binding region 144, the less ground connection line segment 500 of line width and power supply line segment 600 are conducive to cabling to be laid out.
Further, in the present embodiment, the lead 220 on second surface 120 include connected linkage section 222 and
Walk line segment 224.Linkage section 222 is connected away from the one end for walking line segment 224 with the node 230 on first surface 110, walks line segment
224 are located at marginal zone 140, and the line width of linkage section 222 is more than the line width of sensitive grid 210.The line width of linkage section 222 is more than sensitive grid
210 line width, namely the linkage section 222 using resistance less than the resistance of sensitive grid 210, can be reduced caused by the deformation of lead 220
Change in resistance, further reduces influence of the change in resistance to detection structure caused by the deformation of lead 220, obtains to the true of deformation
Response.Further, in the present embodiment, the line width of linkage section 222 is 2 times to 500 times of line width of sensitive grid 210.It is preferred that
, in the present embodiment, the line width of linkage section 222 is 0.1mm to 5mm.Within the specific limits, the line width of linkage section 222 is got over
Small, the increased amplitude of resistance of linkage section 222 is bigger, and the line width of linkage section 222 is bigger, the width of the resistance reduction of linkage section 222
Degree reduces, and the influence and material cost of the line width of linkage section 222 to the resistance of linkage section 222 is considered, by linkage section 222
Line width be set to 0.1mm to 5mm.
Further, in the present embodiment, base material 100 is square, and Wheatstone bridge 200a is square, and 230 nodes institute
Sideline it is parallel with the sideline of base material 100.Linkage section 222 is the straight line parallel with a sideline of base material 100 or is and base
Distinguish parallel right angle folding 222a in the two adjacent sidelines of material 100.Straight line is most short between 2 points, and the one of right angle folding 222a
Bar right-angle side can be used for avoiding other linkage sections 222, and to can be used for straight line between realizing at 2 points most short for another right-angle side.
When designing 220 cabling of lead, linkage section 222 is the straight line parallel with a sideline of base material 100 or is adjacent with base material 100
Two sidelines distinguish parallel right angle folding 222a, can while cabling requirement is met so that the length of linkage section 222 most
It is small, by using the linkage section 222 (resistance of linkage section 222 is directly proportional to length) of smaller length, reduce the resistance of linkage section 222
Value, and then reduce influence of the change in resistance to detection structure caused by lead 220.
Further, in the present embodiment, right angle folding 222a includes connected the first right-angle side 2222 and the second right angle
Side 2224, the one end of the first right-angle side 2222 away from the second right-angle side 2224 is connected with node 230.When linkage section 222 is straight line
When, linkage section 222 is located between the sideline of corresponding node 230 and nearest base material 100 corresponding with the node 230；
When linkage section 222 is right angle folding, the second right-angle side 2224 is located at corresponding node 230 and corresponding with the node 230
Nearest base material 100 sideline between.Namely node 230 is guided to the base material nearest from the node 230 by linkage section 222
100 edge.For the pressure sensitive of pressure sensor 10, in press pressure sensor 10, the center of pressure sensor 10
130 deformation quantity is significantly larger than the deformation of marginal zone 140, by straight line or the linkage section of right-angle folding wire 222 that favour stone is electric
Bridge 200a leads to nearest marginal zone 140, and the resistance of linkage section 222 can be reduced to greatest extent, and then reduction lead 220 causes
Change in resistance to detect structure influence.Lead 200 is guided into the nearest edge of pressure sensor 10 as early as possible, and in pressure
The center 130 of sensor 10 uses broader lead 200, can further reduce change in resistance caused by lead 220 to detection
The influence of structure, improves detection accuracy.
Further, in the present embodiment, the lead 220 on second surface 120 also includes and to walk line segment 224 remote
The bound segments 226 of one end connection of linkage section 222.Line segment 224 is walked located at routing region 142, bound segments 226 are located at binding region
144.Wherein, the line width of bound segments 226 is more than to walk the line width of line segment 224.Bound segments 226 are used to be connected with flexible PCB, make
It is easy to bound segments 226 to be connected with the golden finger contraposition of flexible PCB with the bound segments 226 of larger line width, it is not easy to occur short
Road, breaking phenomena.
Further, in the present embodiment, sensitive grid 210 is identical with the material of lead 220, so that sensitive grid 210 is with drawing
Line 220 can be formed simultaneously, and then can simplify technique.
Further, as shown in Figures 5 and 6, in the present embodiment, base material 100 is provided with through first surface 110 and the
Conductive filler 700 is equipped with the through hole on two surfaces 120, through hole, the one end of conductive filler 700 is with being located on second surface 120
Lead 220 is connected, and the other end is connected with the node 230 on first surface 110.By opening up through hole, filled out in through hole
The mode of conductive material formation conductive filler 700 is filled, to cause the node 230 positioned at different surfaces to be connected with lead 220.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and it describes more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (13)
1. a kind of pressure sensor, including：
Base material, including relative first surface and second surface；
Sensing unit, including four resistance identical sensitive grids and four leads, four sensitive grids join end to end composition
One Wheatstone bridge simultaneously forms four nodes, and four leads are connected with four nodes respectively, wherein, the favour this
Energization bridge is on the first surface, and in four leads of the sensing unit, at least one lead is located at
The first surface, and at least one lead is located at the second surface.
2. pressure sensor according to claim 1, it is characterised in that the size of the Wheatstone bridge is
0.49cm2To 25cm2。
3. pressure sensor according to claim 2, it is characterised in that the line width of the sensitive grid is preferably 0.005mm
To 2.5mm.
4. pressure sensor according to claim 1, it is characterised in that the resistance of the sensitive grid is 120 Ω to 20M
Ω。
5. pressure sensor according to claim 1, it is characterised in that four sensitive grids are respectively head and the tail phase successively
The first sensitive grid, the second sensitive grid, the 3rd sensitive grid and the 4th sensitive grid even；
First sensitive grid is first node, second sensitive grid and institute with the node that second sensitive grid is connected to form
It is Section Point to state the node that the 3rd sensitive grid is connected to form, what the 3rd sensitive grid was connected to form with the 4th sensitive grid
Node is the 3rd node, and the 4th sensitive grid is fourth node with the node that first sensitive grid is connected to form；
The lead being connected with the first node is the first lead, and the lead being connected with the Section Point is second
Lead, the lead being connected with the 3rd node is the 3rd lead, and lead be connected with the fourth node is the
Four leads；
First lead is located at the first surface with the 3rd lead, and second lead is located at the 4th lead
The second surface.
6. pressure sensor according to claim 5, it is characterised in that first sensitive grid and the 3rd sensitive grid
Direction it is identical, second sensitive grid is identical with the direction of the 4th sensitive grid, and the direction of first sensitive grid with
The direction of second sensitive grid is vertical.
7. pressure sensor according to claim 5, it is characterised in that first lead and the 3rd lead difference
For being connected with ground wire and supply voltage, second lead and the 4th lead are used to be connected to detect with detection circuit
State the bridge voltage of Wheatstone bridge.
8. pressure sensor according to claim 7, it is characterised in that the number of the sensing unit be it is multiple, it is multiple
The Wheatstone bridge of the sensing unit is intervally arranged；
The pressure sensor also includes the ground lead and power supply lead wire located at the first surface, the ground lead and institute
Power supply lead wire is stated to be respectively used to be connected with the ground wire and the supply voltage, the first lead of several sensing units with
The same ground lead connection, the 3rd lead of several sensing units is connected with the same power supply lead wire.
9. pressure sensor according to claim 8, it is characterised in that the favour stone electricity of multiple sensing units
Bridge is arranged in some rows, the ground lead and the staggered and adjacent ground lead of the power supply lead wire with it is described
Wheatstone bridge described in a row is pressed from both sides between power supply lead wire；
Wherein, the ground lead between Wheatstone bridge described in adjacent two row simultaneously with Wheatstone bridge described in two rows
First lead connection, the power supply lead wire between Wheatstone bridge described in adjacent two row simultaneously with described in two rows
The 3rd lead connection of Wheatstone bridge, positioned at the institute of Wheatstone bridge described in the outermost ground lead and a row
The connection of the first lead is stated, the 3rd lead positioned at Wheatstone bridge described in the outermost power supply lead wire and a row connects
Connect.
10. pressure sensor according to claim 1, it is characterised in that the base material includes connected center and side
Edge area, the Wheatstone bridge is located at the center；
Lead on the second surface includes the linkage section being connected and walks line segment, and the linkage section walks line segment away from described in
One end be connected with the node on the first surface, the cabling section is positioned at the marginal zone, the linkage section
Line width be more than the sensitive grid line width.
11. pressure sensor according to claim 10, it is characterised in that the line width of the linkage section arrives for 0.1mm
5mm。
12. pressure sensor according to claim 1, it is characterised in that the base material, which is provided with, runs through first table
Be equipped with conductive material in face and the through hole of the second surface, the through hole, described conductive material one end with positioned at described the
Lead connection on two surfaces, the other end is connected with node described in one on the first surface.
13. a kind of touch display unit, it is characterised in that including the pressure sensing as any one of claim 1-12
Device.
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Cited By (1)
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