CN206974577U - Touch control display apparatus and its pressure sensor - Google Patents
Touch control display apparatus and its pressure sensor Download PDFInfo
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- CN206974577U CN206974577U CN201720874293.5U CN201720874293U CN206974577U CN 206974577 U CN206974577 U CN 206974577U CN 201720874293 U CN201720874293 U CN 201720874293U CN 206974577 U CN206974577 U CN 206974577U
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Abstract
It the utility model is related to a kind of touch control display apparatus and its pressure sensor.The pressure sensor includes base material and sensing unit.Base material includes connected center and marginal zone；Sensing unit includes four resistance identical sensitive grids and four leads, and four sensitive grids, which join end to end, to be formed a Wheatstone bridge and form four nodes, and four leads are connected with four nodes respectively；Wherein, the sensitive grid is located at the center, and the lead includes connected first paragraph and second segment, and the second segment is located at the marginal zone, the one end of the first paragraph away from the second segment is connected with the node, and the line width of the first paragraph is more than the line width of the sensitive grid.The pressure sensor has the characteristics of detection accuracy is preferable.
Description
Technical field
Technical field of touch-control display is the utility model is related to, more particularly to a kind of touch control display apparatus and its pressure sensing
Device.
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, touch control display apparatus can be made to experience the pressing dynamics of operator, widen the interactivity of man-machine interface, enhanced use
The usage experience at family.With the continuous development of modernization industrial technology, various types of pressure sensing technologies, which are applied to touch-control, to be shown
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 and show.With the deformation in X/Y plane come detect pressure/
The problem of pressure sensing technology of pulling force can effectively avoid the deformation of Z-direction from directly extruding display screen part, but it is existing
Some is poor to detect the accuracy of the signal detection of the pressure sensing technology of pressure/pulling force with the deformation in X/Y plane.
Utility model content
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 connected center and marginal zone；And
Sensing unit, including four resistance identical sensitive grids and four leads, four sensitive grids join end to end
Form a Wheatstone bridge and form four nodes, four leads are connected with four nodes respectively；
Wherein, the sensitive grid is located at the center, and the lead includes connected first paragraph and second segment, and described the
Two sections are located at the marginal zone, and the one end of the first paragraph away from the second segment is connected with the node, the first paragraph
Line width is more than the line width of the sensitive grid.
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
Change in resistance can occur, 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.And in above-mentioned sensing unit, lead is connected with node, namely lead is outside Wheatstone bridge,
Be not belonging to a part for Wheatstone bridge, during pressing, although change in resistance can also occur for wire squass, due to lead favour this
Outside energization bridge, change in resistance caused by wire squass is very small for change in resistance caused by sensitive grid deformation, less than thousand/
One rank, the influence to electric signal (electric current) are very small.And the line width of first paragraph is more than the line width of sensitive grid, namely use
Resistance is less than the first paragraph of the resistance of sensitive grid, can reduce change in resistance caused by wire squass and account for and be hindered caused by sensitive grid deformation
The ratio of value changes, further reduce influence of the change in resistance to detection structure caused by wire squass.Therefore above-mentioned pressure passes
Sensor has the characteristics of detection accuracy is good.
In one of the embodiments, the direction of two spaced sensitive grids is identical, described in connected two
The direction of sensitive grid is vertical.The setting of the direction of four sensitive grids of above-mentioned Wheatstone bridge, the cabling of sensitive grid can make it that
It is highly integrated, to improve the detection accuracy of sensing unit, and the realization for being easy to technique to make.
In one of the embodiments, four sensitive grids are respectively sequentially connected the first sensitive grid, second quick from beginning to end
Feel grid, the 3rd sensitive grid and the 4th sensitive grid, in rectangular coordinate system corresponding to the Wheatstone bridge, described first is sensitive
Grid, second sensitive grid, the 3rd sensitive grid and the 4th sensitive grid respectively positioned at rectangular coordinate system first quartile,
Second quadrant, third quadrant and fourth quadrant, the direction of the sensitive grid of first sensitive grid and the X-axis direction of rectangular coordinate system
It is identical or vertical；
The node that first sensitive grid and second sensitive grid are connected to form is first node, second sensitive grid
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 is connected to form with first sensitive grid 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 are the 3rd lead, the lead being connected with the fourth node
For the 4th lead, first lead and the 3rd lead are respectively used to be connected with ground wire and supply voltage, and described second draws
Line and the 4th lead are used to be connected to detect the bridge voltage of the Wheatstone bridge with detection circuit.So that above-mentioned biography
Sense unit is highly suitable for building square pressure sensor and beneficial to the wiring of lead.
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
Force snesor has the characteristics of high-res and high sensing precision.
In one of the embodiments, the size of the Wheatstone bridge is 1.00cm2To 9.00cm2.Favour stone electricity
The area of bridge is too small, high to technological requirement, can increase process costs and cause product yield low, and the area of Wheatstone bridge
It is too big, it is impossible to the Wheatstone bridge of enough quantity is set in limited space, and then high-res and height can not be met
Sense the requirement of precision.The size of Wheatstone bridge is preferably 1.00cm2To 9.00cm2, so as in manufacture craft, height
Balanced in resolution and high sensing precision.
In one of the embodiments, the resistance of each sensitive grid is 120 Ω to 20M Ω.The resistance of sensitive grid compared with
Greatly, detection accuracy can be improved.
In one of the embodiments, the resistance of each sensitive grid is 1K Ω to 500K Ω.The resistance of sensitive grid is
1K Ω to 500K Ω, it is avoided that during sensitive grid work and produces the heat of excess because resistance is excessive and thermal deformation phenomenon occur, enter
And the problem of influenceing detection accuracy.
In one of the embodiments, the line width of the sensitive grid is 0.005mm to 2.5mm.The line width of sensitive grid 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, in order to reduce lead
Deform the influence to detection accuracy, it is necessary to using bigger line width lead, increase the area of lead cabling, and increase lead
The area of cabling, the layout area of Wheatstone bridge can be occupied indirectly.The line width of sensitive grid is preferably 0.005mm to 2.5mm energy
Manufacture craft is taken into account well and obtains the equalization point of the layout area of lead cabling area and Wheatstone bridge.
In one of the embodiments, the line width of the first paragraph is 2 times to 500 times of line width of the sensitive grid.The
The ratio ratio of one section of line width and the line width of sensitive grid is more big more is advantageous to improve the detection accuracy of pressure sensor, and works as
When the ratio of the line width of first paragraph and the line width of sensitive grid is excessive, sensitive grid area will be forced to reduce, can be because resistance reduction is (quick
Feel gate length to reduce) sensitivity is reduced, or maintain resistance (reducing line width line-spacing) and increase technology difficulty.Consider increase by
One section of line width can improve the detection accuracy of pressure sensor, and the line width of increase first paragraph may be to sensitivity and technique
The influence of difficulty, the line width of first paragraph is arranged to 2 times to 500 times of the line width of sensitive grid.
In one of the embodiments, the line width of the first paragraph is 0.1mm to 5mm.Within the specific limits, first paragraph
Line width is smaller, and the increased amplitude of resistance of first paragraph is bigger, and the line width of first paragraph is bigger, and the amplitude that the resistance of first paragraph reduces subtracts
It is small, consider the influence of resistance and the influence of technique of the line width of first paragraph to first paragraph, the line width of first paragraph is set to
0.1mm to 5mm.
In one of the embodiments, the sensitive grid and the lead are on the same surface of the base material.Will be quick
Feel grid and lead is located at the same surface of base material, the two relative surfaces of base material are respectively arranged on relative to sensitive grid and lead, can
(it is connected with simplifying manufacture craft in order that base material must be located at without the sensitive grid on surface with lead, it is necessary to open connection on base material
Hole, and conductive material is filled into intercommunicating pore).
In one of the embodiments, the line width of the second segment is less than the line width of the first paragraph.Second segment is located at base
The marginal zone of material, the deformation quantity of second segment is small, and change in resistance is small, uses influence of the less second segment of line width to detection accuracy
It is smaller, and the less second segment of line width is used, after the number of second segment determines, it can make it that the width of marginal zone is smaller,
And then increase the usable area of Wheatstone bridge.
In one of the embodiments, the line width of the second segment is more than or equal to the line width of the sensitive grid.So as to
To reduce resistance variations caused by the deformation of second segment, influence of the second segment to detection accuracy is reduced.
In one of the embodiments, the lead also includes being connected with the one end of the second segment away from the first paragraph
The 3rd section；
The marginal zone includes connected routing region and binding region, the second segment are located at the routing region, institute
State the 3rd section and be located at the binding region, described 3rd section of line width is more than the line width of the second segment.3rd section be used for it is soft
Property circuit board connection, be easy to the 3rd section and the contraposition connection of the golden finger of flexible PCB using the 3rd section of larger line width, do not allow
Easily there is short circuit, breaking phenomena.
A kind of touch display unit, including above-mentioned pressure sensor.
Brief description of the drawings
Fig. 1 is the structural representation of the pressure sensor of an embodiment；
Fig. 2 is the structural representation of the Wheatstone bridge in Fig. 1；
Fig. 3 is the structural representation of the Wheatstone bridge in another embodiment；
Fig. 4 is the structural representation of the pressure sensor of another embodiment.
Embodiment
Below in conjunction with the accompanying drawings and touch display unit and its pressure sensor are described further specific embodiment.
A kind of pressure sensor that present embodiment provides, it can be applied to mobile phone, tablet personal computer, interactive electronic and shows
The touch control display apparatus such as screen, to cause touch control display apparatus while there is two big function of touch-control and pressure sensitive.
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 be connected with detection circuit, during pressing, the stress of sensing unit 200 deforms upon its internal resistance afterwards
Resistance changes so that the electric signal such as electric current, voltage that sensing unit 200 exports changes, and detection circuit passes through to electricity
The capture of signal is simultaneously analyzed and processed, you can pressure signal is detected.
As shown in Figures 2 and 3, in the present embodiment, base material 100 includes connected center 110 and marginal zone 120.
Sensing unit 200 includes four resistance identical sensitive grids 210 and four leads 220, and four sensitive grids 210 join end to end structure
Into a Wheatstone bridge 200a and four nodes 230 are formed, four leads 220 are connected with four nodes 230 respectively.Wherein,
Sensitive grid 210 is located at center 110, and lead 220 includes connected first paragraph 222 and second segment 224, and second segment 224 is located at side
Edge area 120, the one end of first paragraph 222 away from second segment 224 are connected with node 230.The line width of first paragraph 224 is more than sensitive grid
210 line width.
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
Change in resistance can occur, 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.And in above-mentioned sensing unit 200, lead 220 is connected with node 230, namely lead 220 exists
Outside Wheatstone bridge 200a, a Wheatstone bridge 200a part is not belonging to.And the main deformation area (center of lead 220
110, namely it is visual it is trivial in) line width of first paragraph 222 is wider, resistance is relatively low, low deformation area (marginal zone 120) second segment 224
Line width is thinner, and resistance is higher, so the overall change in resistance amount of lead 220 will be much smaller than the change in resistance amount of sensitive grid 210
(one thousandth rank).So pressing when, although change in resistance can also occur for the deformation of lead 220, due to lead 220 favour this
Outside energization bridge 200a, and the deformation form that lead 220 is special so that lead influences on Wheatstone bridge 200a output signal
Much smaller than one thousandth semaphore rank, thus above-mentioned pressure sensor 10 with detection accuracy it is good the characteristics of.
Further, in the present embodiment, the direction of two connected sensitive grids 210 intersects.Preferably, in this embodiment party
In formula, the direction of spaced two sensitive grids 210 is identical, and the direction of two connected sensitive grids 210 is vertical.Such as Fig. 2 institutes
Show, Wheatstone bridge 200a four sensitive grids 210 are respectively the first sensitive grid 210a, the second sensitive grid 210b, the 3rd sensitivity
Grid 210c and the 4th sensitive grid 210d, wherein, the first sensitive grid 210a direction is identical with the 3rd sensitive grid 210c direction, the
Two 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, it can make it that the cabling of sensitive grid 210 is highly integrated, it is single to improve sensing
The detection accuracy of member 200, and the realization for being easy to technique to make.
Specifically, in the present embodiment, in rectangular coordinate system corresponding to sensing unit 200, the first sensitive grid 210a,
Second sensitive grid 210b, the 3rd sensitive grid 210c and the 4th sensitive grid the 210d first quartile positioned at rectangular coordinate system, the respectively
Two quadrant, third quadrant and fourth quadrant, the first sensitive grid 210a direction of sensitive grid and the X-axis of rectangular coordinate system are towards phase
It is same or vertical.In fig. 2, the X-axis of the direction of the first sensitive grid 210a sensitive grid and rectangular coordinate system towards it is vertical (that is,
The direction of first sensitive grid 210a sensitive grid is vertical with the X-direction of rectangular coordinate system), in figure 3, the first sensitive grid 210a
The direction of sensitive grid and the X-axis of rectangular coordinate system towards identical.
The node that first sensitive grid 210a and the second sensitive grid 210b are connected to form is first node 232, the second sensitive grid
The node that 210b and the 3rd sensitive grid 210c are connected to form is section point 234, the 3rd sensitive grid 210c and the 4th sensitive grid
The node that 210d is connected to form is the 3rd node 236, the node that the 4th sensitive grid 210d and the first sensitive grid 210a are connected to form
For fourth node 238.
The lead being connected with first node 232 is the first lead 220a, and the lead being connected with section point 234 draws for second
Line 220b, the lead being connected with the 3rd node 236 are the 3rd lead 220c, and the lead being connected with fourth node 238 draws for the 4th
Line 220d.First lead 220a is respectively used to be connected with ground wire (GND) and supply voltage (VDD) with the 3rd lead 220c, and second
Lead 220b and the 4th lead 220d is used to be connected to detect Wheatstone bridge 200a bridge voltage with detection circuit.So that
Above-mentioned sensing unit 200 is highly suitable for building square pressure sensor 10 and beneficial to the wiring of lead 200.In other realities
Apply in mode, the second lead 220b and the 4th lead 220d may be respectively used for connecting with ground wire (GND) and supply voltage (VDD)
Connect, the first lead 220a can be used for being connected with detection circuit to detect Wheatstone bridge 200a bridge electricity with the 3rd lead 220c
Pressure.
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 pressure sensor 10 has the characteristics of 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, it is preferable that detection accuracy can be improved, in the present embodiment, the resistance of sensitive grid 210 is 1K Ω to 500K Ω.It is sensitive
The resistance of grid 210 is 1K Ω to 500K Ω, is avoided that when sensitive grid 210 works and produces the heat of excess because resistance is excessive and go out
Existing thermal deformation phenomenon, and then the problem of influence detection accuracy.
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,
In order to reduce lead 200 deform to detection accuracy influence, it is necessary to using bigger line width lead 200, increase lead 200
The area of cabling, and increase the area of the cabling of lead 200, Wheatstone bridge 200a layout area can be occupied indirectly.Sensitive grid
210 line width is preferably that 0.005mm to 2.5mm can take into account manufacture craft well and obtain the cabling area of lead 200 and favour
The equalization point of stone electric bridge 200a layout area.
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 line width of first paragraph 222 is 2 times to 500 times of line width of sensitive grid 210.The
The ratio ratio of one section 222 of line width and the line width of sensitive grid 210 is more big more is advantageous to improve the detection standard of pressure sensor 10
True property, and when the ratio of the line width and the line width of sensitive grid 210 of first paragraph 222 is excessive, the area of sensitive grid 210 will be forced to subtract
Few, can reduce (reduction of the length of sensitive grid 210) because of resistance reduces sensitivity, or maintains resistance (reducing line width line-spacing) and increase
Technology difficulty.The detection accuracy of pressure sensor 10 can be improved by considering the line width of increase first paragraph 222, and increase by the
The line width of first paragraph 222 may be arranged to sensitive grid 210 by one section 222 of line width to sensitivity and the influence of technology difficulty
2 times to 500 times of line width.Preferably, in the present embodiment, the line width of first paragraph 222 is 0.1mm to 5mm.In certain limit
Interior, the line width of first paragraph 222 is smaller, and the increased amplitude of resistance of first paragraph 222 is bigger, and the line width of first paragraph 222 is bigger, and first
The amplitude that the resistance of section 222 reduces reduces, consider the influence to the resistance of first paragraph 222 of the line width of first paragraph 222 and
The influence of technique, the line width of first paragraph 222 is set to 0.1mm to 5mm.
Further, in the present embodiment, sensitive grid 210 and lead 220 are on the same surface of base material 100.Will be quick
Feel grid 210 and lead 220 is located at the same surface of base material 100, base material 100 is respectively arranged on relative to sensitive grid 210 and lead 220
Two relative surfaces, can simplify manufacture craft (in order that must be located at base material 100 do not have to surface sensitive grid 210 and lead
220 connections on base material 100, it is necessary to open intercommunicating pore, and conductive material is filled into intercommunicating pore).
Further, in the present embodiment, base material 100 is square, and Wheatstone bridge 200a is square, and the institute of node 230
Sideline it is parallel with the sideline of base material 100.First paragraph 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 Wheatstone bridge 200a and other first paragraphs 222, and another right-angle side can be used for realizing
Straight line is most short between 2 points.When designing 220 cabling of lead, first paragraph 222 for the straight line parallel with a sideline of base material 100 or
For the parallel right angle folding 222a of the adjacent two sidelines difference with base material 100, can cause while cabling requirement is met
The length of first paragraph 222 is minimum, by using the first paragraph 222 (resistance of first paragraph 222 is directly proportional to length) of smaller length,
The resistance of first paragraph 222 is reduced, and then change in resistance caused by reduction lead 220 accounts for change in resistance caused by sensitive grid 210
Ratio, further 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 are connected with node 230.When first paragraph 222 is straight line
When, first paragraph 222 is located between the sideline of corresponding node 230 and nearest base material 100 corresponding with the node 230；
When first paragraph 222 is right angle folding, the second right-angle side 2224 is positioned at corresponding node 230 and corresponding with the node 230
Nearest base material 100 sideline between.Namely the base material nearest from the node 230 is guided to node 230 by first paragraph 222
100 edge.Pressure sensitive for pressure sensor 10, in press pressure sensor 10, the center of pressure sensor 10
110 deformation quantity is significantly larger than the deformation of marginal zone 120, by straight line or the first paragraph of right-angle folding wire 222 that favour stone is electric
Bridge 200a leads to nearest marginal zone 120, can reduce the resistance of first paragraph 222 to greatest extent, and then reduces lead 220 and cause
Change in resistance account for the ratio of change in resistance caused by sensitive grid 210, further reduce change in resistance caused by lead 220 to inspection
The influence of geodesic structure.Lead 200 is guided into the nearest edge of pressure sensor 10 as early as possible, and at the center of pressure sensor 10
Area 110 uses broader lead 200, can further reduce influence of the change in resistance caused by lead 220 to detection structure, improve
Detection accuracy.
Further, as shown in figure 1, in the present embodiment, base material 100 is rectangle, the number of sensing unit 200 is more
Individual, the long side of the Wheatstone bridge 200a of multiple sensing units 200 along base material 100 is arranged in two rows.Marginal zone 120 includes being connected
Routing region 122 and binding region 124, binding region 124 be located at one end of base material 100.Positioned at base material 100 away from binding area
Two Wheatstone bridge 200a of the one end in domain 124 are two the first Wheatstone bridges, four sections with the first Wheatstone bridge
Four first paragraphs 222 of point connection are straight line.Two favour stones electricity positioned at base material 100 close to one end of binding region 124
Bridge 200a is two the second Wheatstone bridges, and three first paragraphs 222 being connected with four nodes of the second Wheatstone bridge are straight
Line, another first paragraph 222 are right angle folding 222a.Positioned at two the first Wheatstone bridges and two the second Wheatstone bridges it
Between several Wheatstone bridges 200a be several the 3rd Wheatstone bridges, be connected with four nodes of the 3rd Wheatstone bridge
Three first paragraphs 222 be straight line, another first paragraph is right angle folding 222a.Binding region 124 is located at the one of base material 100
End, is easy to second segment 224 to be connected with flexible PCB.In the present embodiment, the number of sensing unit 200 is 6, at other
In embodiment, the number of sensing unit 200 can be set according to actual demand.
As shown in figure 4, in other embodiments, marginal zone 120 include routing region 122 and respectively with routing region
The first binding region 124 and the second binding region 126 of 122 both ends connection, the first binding region 124 and the second binding region
126 are located at the both ends of base material 100 respectively.It is positioned at two Wheatstone bridge 200as of the base material 100 close to the first binding region 124
Two the first Wheatstone bridges, four first paragraphs 222 being connected with four nodes of the first Wheatstone bridge are straight line.It is located at
Base material 100 is two the second Wheatstone bridges close to two Wheatstone bridge 200a of the second binding region 126, with the second favour this
Four first paragraphs 222 of four nodes 230 connection of energization bridge are straight line.Positioned at two the first Wheatstone bridges and two
Several Wheatstone bridges 200a between two Wheatstone bridges is several the 3rd Wheatstone bridges, with the 3rd Wheatstone bridge
Four nodes 230 connection three first paragraphs 222 be straight line, another first paragraph 222 is right angle folding 222a.In base material
100 both ends set the first binding region 124 and the second binding region 126 respectively, can to converge at the one end of base material 100
Lead 200, the both ends of base material 100 are converged at respectively, so as to reduce the width of marginal zone 120, obtain the pressure of narrow frame
Sensor 10.
Further, in the present embodiment, the line width of second segment 224 is less than the line width of first paragraph 222.Second segment 22 is located at
The marginal zone 120 of base material 100, the deformation quantity of second segment 22 is small, and change in resistance is small, using the less second segment 224 of line width to inspection
It is smaller to survey the influence of accuracy, and uses the less second segment 224 of line width, after the number of second segment 224 determines, can make
Marginal zone 120 width it is smaller, and then increase Wheatstone bridge 200a usable area.Further, in present embodiment
In, the line width of second segment 224 is more than or equal to the line width of sensitive grid 210.So as to reduce caused by the deformation of second segment 224
Resistance variations, reduce influence of the second segment 224 to detection accuracy.Preferably, in the present embodiment, the line of second segment 224
1.5 times to 50 times of the line width of a width of sensitive grid 210.
Further, in the present embodiment, lead 220 also includes being connected with the one end of second segment 224 away from first paragraph 222
The 3rd section 226.Second segment 224 is located at routing region 122, and the 3rd section 226 is located at binding region 124, the 3rd section 226 of line width
More than the line width of second segment 224.It is used to for 3rd section 226 be connected with flexible PCB, is easy to using the 3rd section 226 of larger line width
3rd section 226 and the golden finger contraposition connection of flexible PCB, it is not easy to short circuit, breaking phenomena occur.
Further, in the present embodiment, sensitive grid 210 is identical with the material of lead 220, so as to which sensitive grid 210 is with drawing
Line 220 can be formed simultaneously, and then can simplify technique.
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 that this specification is recorded all is considered to be.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (15)
1. a kind of pressure sensor, including：
Base material, including connected center and marginal zone；And
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 sensitive grid is located at the center, and the lead includes connected first paragraph and second segment, the second segment
Positioned at the marginal zone, the one end of the first paragraph away from the second segment is connected with the node, the line width of the first paragraph
More than the line width of the sensitive grid.
2. pressure sensor according to claim 1, it is characterised in that the direction of two spaced sensitive grids
Identical, the direction of two connected sensitive grids is vertical.
3. pressure sensor according to claim 2, it is characterised in that four sensitive grids are respectively head and the tail phase successively
Even the first sensitive grid, the second sensitive grid, the 3rd sensitive grid and the 4th sensitive grid, in rectangular co-ordinate corresponding to the Wheatstone bridge
In system, first sensitive grid, second sensitive grid, the 3rd sensitive grid and the 4th sensitive grid are located at right angle respectively
The first quartile of coordinate system, the second quadrant, third quadrant and fourth quadrant, the direction of the sensitive grid of first sensitive grid with it is straight
The X-axis of angular coordinate system is towards identical or vertical；
The node that first sensitive grid is connected to form with second sensitive grid is first node, second sensitive grid and institute
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 node that the 4th sensitive grid is connected to form with first sensitive grid 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 are the 3rd lead, and the lead being connected with the fourth node is the
Four leads, first lead and the 3rd lead are respectively used to be connected with ground wire and supply voltage, second lead and
4th lead is used to be connected to detect the bridge voltage of the Wheatstone bridge with detection circuit.
4. pressure sensor according to claim 1, it is characterised in that the size of the Wheatstone bridge is
0.49cm2To 25cm2。
5. pressure sensor according to claim 4, it is characterised in that the size of the Wheatstone bridge is
1.00cm2To 9.00cm2。
6. pressure sensor according to claim 4, it is characterised in that the resistance of each sensitive grid is that 120 Ω are arrived
20MΩ。
7. pressure sensor according to claim 6, it is characterised in that the resistance of each sensitive grid is that 1K Ω are arrived
500KΩ。
8. pressure sensor according to claim 4, it is characterised in that the line width of the sensitive grid arrives for 0.005mm
2.5mm。
9. pressure sensor according to claim 1, it is characterised in that the line width of the first paragraph is the sensitive grid
2 times to 500 times of line width.
10. pressure sensor according to claim 9, it is characterised in that the line width of the first paragraph is 0.1mm to 5mm.
11. pressure sensor according to claim 1, it is characterised in that the sensitive grid and the lead are located at described
On the same surface of base material.
12. pressure sensor according to claim 1, it is characterised in that the line width of the second segment is less than described first
The line width of section.
13. pressure sensor according to claim 12, it is characterised in that the line width of the second segment is more than or equal to institute
State the line width of sensitive grid.
14. pressure sensor according to claim 12, it is characterised in that the lead also includes remote with the second segment
From the 3rd section of one end connection of the first paragraph；
The marginal zone includes connected routing region and binding region, and the second segment is located at the routing region, and described the
Three sections are located at the binding region, and described 3rd section of line width is more than the line width of the second segment.
15. a kind of touch display unit, it is characterised in that including the pressure sensing as any one of claim 1-14
Device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720874293.5U CN206974577U (en) | 2017-07-18 | 2017-07-18 | Touch control display apparatus and its pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720874293.5U CN206974577U (en) | 2017-07-18 | 2017-07-18 | Touch control display apparatus and its pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206974577U true CN206974577U (en) | 2018-02-06 |
Family
ID=61403171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720874293.5U Active CN206974577U (en) | 2017-07-18 | 2017-07-18 | Touch control display apparatus and its pressure sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206974577U (en) |
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2017
- 2017-07-18 CN CN201720874293.5U patent/CN206974577U/en active Active
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Effective date of registration: 20210420 Address after: 231323 Building 1, precision electronics industrial park, Hangbu Town, Shucheng County, Lu'an City, Anhui Province Patentee after: Anhui jingzhuo optical display technology Co.,Ltd. Address before: 330000 Jiangxi city of Nanchang province Huangjiahu road Nanchang economic and Technological Development Zone Patentee before: Nanchang OFilm Tech. Co.,Ltd. |
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