CN106293280A - Touch control display apparatus and pressure touch unit - Google Patents
Touch control display apparatus and pressure touch unit Download PDFInfo
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- CN106293280A CN106293280A CN201510295961.4A CN201510295961A CN106293280A CN 106293280 A CN106293280 A CN 106293280A CN 201510295961 A CN201510295961 A CN 201510295961A CN 106293280 A CN106293280 A CN 106293280A
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Abstract
The present invention relates to a kind of pressure touch unit and use the touch control display apparatus of this pressure touch unit.Pressure touch unit includes flexible PCB and the piezoelectric film sensor being arranged on flexible PCB, wherein flexible PCB includes the first basic unit, first line layer and the second basic unit set gradually, and described second basic unit arranges the first line layer of hole exposed portion；Piezoelectric film sensor includes piezoelectric membrane and lays respectively at the upper conducting resinl of piezoelectric membrane both sides and lower conducting resinl, described piezoelectric film sensor is arranged at the described hole of flexible PCB, and described upper conducting resinl bonds with first line layer, described upper conducting resinl is as the upper electrode of piezoelectric film sensor, and described lower conducting resinl is as the bottom electrode of piezoelectric film sensor.Piezoelectric film sensor is integrally disposed on flexible PCB, the winding displacement design of piezoelectric film sensor, the most beneficially pressure touch unit assembling in touch control display apparatus can be simplified.
Description
Technical field
The invention belongs to touch-control display field, relate to a kind of touch control display apparatus, particularly relate to one and have
The touch control display apparatus of pressure sensing effect.
Background technology
At present, there is the electronic products such as the mobile phone of touch controllable function, panel computer, TV be increasingly employed
Capacitance touching control scheme.But, also there is many defects in capacitance type touch control screen, such as when the hands of larger area
The palm or conductor can cause the erroneous judgement of capacitance type touch control screen when capacitance type touch control screen rather than touch；In humidity
Environment in or when there is water droplet, spot in capacitance touching control screen surfaces, also can cause the mistake of capacitance type touch control screen
Operate or operate insensitive；Additionally, the hands of band glove can not be used or holds nonconducting object and normally grasps
Make capacitance type touch control screen.
The maloperation of capacitance type touch control screen can be caused to ask for capacitance type touch control screen surface moisture or when depositing spot
Topic, the most not yet occurs that gratifying scheme can be solved.There is part manufacturer by improving condenser type
The modes such as the sensitivity of touch screen improve touch control operation effect during band glove, but this scheme can make when without
During glove operation, capacitance type touch control screen is the sensitiveest and produce maloperation, the most this scheme can not solution never
The touch control operation of conductive body.Also have part manufacturer by being used in combination the touch scheme of pressure transducer, but
It is to there is assembly difficulty, high in cost of production defect.
Summary of the invention
Based on this, it is necessary to for the problems referred to above, it is provided that a kind of pressure touch unit and use this pressure touch
The touch control display apparatus of unit.
A kind of pressure touch unit, including flexible PCB and the piezoelectric membrane that is arranged on flexible PCB
Sensor, wherein:
Described flexible PCB includes the first basic unit, first line layer and the second basic unit set gradually, described
The first line layer of hole exposed portion is set in the second basic unit；
Described piezoelectric film sensor include piezoelectric membrane and lay respectively at piezoelectric membrane both sides upper conducting resinl and
Lower conducting resinl, described piezoelectric film sensor is arranged at the described hole of flexible PCB, and described on lead
Electricity glue and first line layer bond, described upper conducting resinl as the upper electrode of piezoelectric film sensor, described under
Conducting resinl is as the bottom electrode of piezoelectric film sensor.
Piezoelectric film sensor is integrally disposed on flexible PCB by above-mentioned pressure touch unit, can simplify pressure
The winding displacement design of force transducer, the most beneficially pressure touch unit assembling in touch control display apparatus.Furthermore,
By conducting resinl as the electrode of piezoelectric film sensor, the thickness of piezoelectric film sensor can be reduced, from
And make the thickness with the touch control display apparatus of this pressure touch unit also can reduce.
Wherein in an embodiment, the interface end of flexible PCB also forms a benefit in the outside of the first basic unit
Strong plate.
A kind of touch control display apparatus, including display unit, above-mentioned pressure touch unit and casing, described machine
Shell conduction and ground connection, the lower conducting resinl of the piezoelectric film sensor of described pressure touch unit is bonding with casing,
Described display unit has metal frame or conductive layer, the first basic unit of described pressure touch unit by viscose glue with
Display unit is bonding.
Wherein in an embodiment, by gluing between the second basic unit and the casing of described pressure touch unit
Layer is bonding.
A kind of pressure touch unit, including flexible PCB and the piezoelectric membrane that is arranged on flexible PCB
Sensor, wherein:
The first basic unit that described flexible PCB includes setting gradually, first line layer, encapsulated layer, the second line
Road floor and the second basic unit, described second basic unit arranges the second line layer of hole exposed portion；
Described piezoelectric film sensor include piezoelectric membrane and lay respectively at piezoelectric membrane both sides upper conducting resinl and
Lower conducting resinl, described piezoelectric film sensor is arranged at the described hole of flexible PCB, and described on lead
Electricity glue and the second line layer bond, described upper conducting resinl as the upper electrode of piezoelectric film sensor, described under
Conducting resinl is as the bottom electrode of piezoelectric film sensor.
Wherein in an embodiment, described second line layer passes as the charge signal of piezoelectric film sensor
Defeated layer, described second line layer draws signal feeler, described first line layer in the interface end of flexible PCB
With after the part connection in the second line layer flexible PCB interface end draw ground connection feeler, described
Signal feeler is generally aligned in the same plane with ground connection feeler.
Wherein in an embodiment, described first line layer be the conductive layer of whole using as electro-magnetic screen layer,
Described encapsulated layer is provided with passage, makes the part connection in first line layer and the second line layer and passes through institute
State part line-to-ground.
Wherein in an embodiment, the interface end of flexible PCB also forms a benefit in the outside of the first basic unit
Strong plate.
A kind of touch control display apparatus, including casing and any one pressure touch unit above-mentioned, described casing
Conduction and grounding, the lower conducting resinl of the piezoelectric film sensor of described pressure touch unit is bonding with casing.
Wherein in an embodiment, also include display unit, capacitive touch control unit and cover sheet, described
Display unit, capacitive touch control unit and cover sheet are successively set on the flexible circuit of described pressure touch unit
In first basic unit of plate.
A kind of touch control display apparatus, including any one pressure touch unit above-mentioned, and display unit, institute
Stating display unit and have metal frame or conductive layer, described metal frame or conductive layer ground connection, described pressure touches
The lower conducting resinl of piezoelectric film sensor of control unit bonding with display unit and with described metal frame or conductive layer
Conducting.
Accompanying drawing explanation
The structural representation of the touch control display apparatus that Fig. 1 provides for one embodiment of the invention；
Fig. 2 is the cross section structure schematic diagram of touch control display apparatus shown in Fig. 1；
The cross section structure schematic diagram of the touch control display apparatus that Fig. 3 and Fig. 4 provides for different embodiments of the invention；
The structural representation of the pressure touch unit that Fig. 5 provides for one embodiment of the invention；
Fig. 6 is the cross section structure schematic diagram of pressure touch unit shown in Fig. 5；
Fig. 6 A to Fig. 6 is similar, it is shown that the cross section structure of the pressure touch unit that another embodiment provides；
The structural representation of the piezoelectric film sensor that Fig. 7 provides for one embodiment of the invention；
The knot of the flexible PCB for integrating piezoelectric film sensor that Fig. 8 provides for one embodiment of the invention
Structure schematic diagram；
Fig. 9 and Figure 10 is sectional view and the front elevation of the interface end of flexible PCB shown in Fig. 8；
The flexible PCB made for integrating piezoelectric film sensor that Figure 11 provides for one embodiment of the invention
Flow chart；
The cross section structure schematic diagram of the pressure touch unit that Figure 12 provides for another embodiment of the present invention；
Figure 13 and Figure 14 is the cross section at interface end of the flexible PCB in pressure touch unit shown in Figure 12
Figure and front elevation；
The cross section structure schematic diagram of the touch control display apparatus of the pressure touch unit that Figure 15 provides for application Figure 12；
The cross section structure schematic diagram of the pressure touch unit that Figure 16 provides for another embodiment of the present invention；
Figure 17 and Figure 18 is the cross section at interface end of the flexible PCB in pressure touch unit shown in Figure 16
Figure and front elevation；
The cross section structure schematic diagram of the touch control display apparatus of the pressure touch unit that Figure 19 provides for application Figure 16；
The cross section structure schematic diagram of the pressure touch unit that Figure 20 provides for another embodiment of the present invention；
Figure 21 and Figure 22 is the cross section at interface end of the flexible PCB in pressure touch unit shown in Figure 20
Figure and front elevation；
The cross section structure schematic diagram of the touch control display apparatus of the pressure touch unit that Figure 23 provides for application Figure 20；
The structure of the different visual angles of the touch control display apparatus that Figure 24 and Figure 25 provides for another embodiment of the present invention
Schematic diagram.
Detailed description of the invention
As depicted in figs. 1 and 2, a kind of touch control display apparatus that one embodiment of the invention provides includes protection cap
Plate 10, capacitive touch control unit 20, pressure touch unit 30 and display unit 40.This touch-control is shown by user
When device operates, the positional information of touch point can be judged by capacitive touch control unit 20, meanwhile, logical
Excess pressure touch control unit 30 judges touch point pressure applied information, then utilizes this pressure information to realize spy
Fixed function.
Cover sheet 10 can be strengthening glass cover-plate, plastic cover plate, polymethyl methacrylate (PMMA)
Cover plate etc..
Capacitive touch control unit 20 includes the flexible PCB that capacitance sensor 21 is connected with capacitance sensor 21
22 and capacitance touching control chip (not shown).Capacitance sensor 21 includes multiple drive electrode and induction electrode,
Both touch control electrode (not shown) can be distributed in same base material (not shown), or is distributed in two respectively
Different base materials, these two kinds of touch control electrode can be formed at the medial surface of cover sheet 10 and make cover sheet
10 functions having capacitance sensor concurrently.The surface of the insulating substrate fitting in cover sheet 10 can also be formed at.
Capacitance sensor 21 also includes the leading electrode (not shown, such as silver slurry) conducted with touch control electrode, draws
Touch control electrode is led at one by conductive electrode, and by anisotropic conductive (ACF) and flexible PCB 22
Binding.Capacitance touching control chip can be arranged on the flexible PCB 22 of capacitive touch control unit 20, it is also possible to
Be arranged on the mainboard of touch control display apparatus, such as when this touch control display apparatus is mobile phone, can be by electric capacity
The capacitance touching control chip of touch control unit 20 is integrated and is arranged on the mainboard of mobile phone.
Capacitive touch control unit 20 can detect the exact position obtaining multiple touch points by capacity coupled mode
Information.
Pressure touch unit 30 includes flexible PCB 32, three or three be arranged on flexible PCB 32
Individual above pressure transducer 31, and control chip (not shown).Pressure transducer 31 can be piezoelectricity
The power sensing of the types such as thin film sensor, resistance-type force transducer, capacitive force transducer or metal strain meter
Device.
In the present embodiment, pressure touch unit 30 is positioned at capacitive touch control unit 20 away from the one of cover sheet 10
Side.In other words, in the present embodiment, cover sheet 10 in this touch control display apparatus, capacitive touch control unit 20,
Pressure touch unit 30 and display unit 40 set gradually.
As shown in Figure 3, in certain embodiments, pressure touch unit 30 may be alternatively located at display unit 40
Away from the side of capacitive touch control unit 20, display unit 40 is then positioned at capacitive touch control unit 20 away from protection cap
The side of plate 10.In this embodiment, the cover sheet 10 in this touch control display apparatus, capacitive touch control unit
20, display unit 40 and pressure touch unit 30 set gradually.
As shown in Figure 4, in certain embodiments, pressure touch unit 30 can also be directly in protection cap
The side of plate 10.In this embodiment, the cover sheet 10 in this touch control display apparatus, pressure touch unit
30, capacitive touch control unit 20 and display unit 40 set gradually.
Pressure transducer 31 can be distributed in the corner of pressure touch unit 30.As shown in fig. 1, pressure
Sensor 31 is four, is separately positioned at four end points of flexible PCB 32, this pressure transducer 31
It is distributed in four corners of touch control display apparatus.
The control chip of pressure touch unit 30 can be integrated on the mainboard being arranged on this touch control display apparatus, or sets
Put on flexible PCB 32, and reach electric connection with flexible PCB 32.
Pressure transducer 31 is combined and is arranged on flexible PCB 32, on flexible PCB 32 by the present invention
Circuit, by pressure transducer 31 and external control chip electrically conducting, is adopted and can be improved pressure in this way and touch
The integrated level of control unit 30, it is simple to follow-up assembling.
Below will be as a example by pressure transducer 31 select piezoelectric film sensor, to this pressure touch unit 30
Concrete structure and setting be described further.
As shown in Figure 5 and Figure 6, in an embodiment, pressure touch unit 30 include piezoelectric film sensor 310,
Flexible PCB 32, control chip.Control chip can comprise operational amplifier 33, single-chip microcomputer (turns containing A/D
Parallel operation, not shown) etc. components and parts.
Position is specifically set according to pressure touch unit 30, double faced adhesive tape, glue or foam rubber can be passed through and touch
The control casing (not shown) of display device, cover sheet 10, capacitive touch control unit 20 or display unit 40 paste
Close.
For reducing the cost of pressure touch unit 30, improve the utilization rate of flexible PCB 32, its integrated pressure
The flexible PCB 32 of conductive film sensor 310 can be an entirety, or as shown in Figure 5, including
Two or more flexible PCBs 32, can by attachment structure 320 e.g. between multiple flexible PCBs 32
Zero insertion force (Zero Insertion Force, ZIF) connected structure or plate are to plate (Board To Board, BTB)
Snap arrangement reaches connection.
It is illustrated in figure 6 the schematic cross-section of flexible PCB 32 and piezoelectric film sensor 310 junction.
This piezoelectric film sensor 310 includes piezoelectric membrane 311 and lays respectively at powering on of piezoelectric membrane 311 both sides
Pole 312 and bottom electrode 313.
Flexible PCB 32 includes two-layer double-sided metal cladding plate and for bonding the viscous of two-layer double-sided metal cladding plate
Glue.Specifically, flexible PCB 32 include the most successively the first basic unit 321, first line layer 322,
First encapsulated layer the 323, second line layer 324, adhesive layer 325, tertiary circuit layer the 326, second encapsulated layer
327, the 4th line layer 328 and the second basic unit 329.Wherein first basic unit's the 321, first encapsulated layer 323,
The material of two encapsulated layers 327 and the second basic unit 329 can be polyimides or polyester PET.First line layer
322, the second line layer 324, tertiary circuit layer the 326, the 4th line layer 328 can be layers of copper.
Wherein, first encapsulated layer the 323, second encapsulated layer 327, adhesive layer 325 arrange corresponding passage,
Make the part line conduction on first line layer the 322, the 4th line layer 328 and the second line layer 324, and
Grounding.
The relevant position of adhesive layer 325 arranges the second line layer 324 and the 3rd of hole 320 exposed portion
Line layer 326.Piezoelectric film sensor 310 is arranged in this hole 320, and piezoelectric film sensor 310
Upper electrode 312 turned on the second line layer 324 by conducting resinl 330, bottom electrode 313 passes through another leads
Electricity glue 330 turns on tertiary circuit layer 326.
When piezoelectric film sensor 310 integrally disposed in this flexible PCB 32 time, flexible PCB 32
In first line layer 322 and the 4th line layer 328 act as the screen layer of piezoelectric film sensor 310,
Due to the grounding of screen layer, external electrical field and magnetic field will not be made to affect the electricity of piezoelectric film sensor 310
Lotus signal.
Operational amplifier 33 (including electric charge one-level and voltage second amplifying circuit, not shown) and single-chip microcomputer can
To be integrally disposed on flexible PCB 32, it is possible to be arranged on the mainboard of touch control display apparatus.Shown in Fig. 5
In embodiment, operational amplifier 33 is integrally disposed on flexible PCB 32, and near flexible PCB 32
Interface end.Single-chip microcomputer is arranged on the mainboard of touch control display apparatus.
When piezoelectric membrane 311 stress of piezoelectric film sensor 310, its upper and lower surface can produce faradism
Lotus, carries out charge signal transmission by upper/lower electrode 312,313, and by conducting resinl 330 and flexible
Charge signal is transmitted to operational amplifier by the second line layer 324 and tertiary circuit layer 326 in circuit board 32
33.The signal transmission amplified through operational amplifier 33 carries out analog digital conversion to single-chip microcomputer and becomes digital signal, builds
Vertical touch pressure and the corresponding relation of signal.
When user's finger or other conductor carry out touch operation to touch display unit, owing to user is with tactile
Touch and between the capacitive touch control unit 20 of display device, produce coupling electric capacity, the electric capacity meeting of capacitive touch control unit 20
Change, according to the ultimate principle of capacitance touching control, can detect, obtain the accurate location information of touch point.
Simultaneously as the cover sheet 10 also stress of touch display unit, this power is transmitted to pressure touch unit 30,
Pressure touch unit 30 can detect the component information of each pressure transducer 31 present position, according to choosing
The type of the pressure transducer 31 taken is different, this information can be change in voltage information, capacitance variation information,
Resistance variations information etc..The pressure information obtained according to each pressure transducer 31, it is possible to achieve specific
Function.Such as, in one embodiment, according to residing for the size of four signals and pressure transducer 31
Position can accurately obtain the positional information of touch point.When capacitive touch control unit 20 and pressure touch unit 30
When all obtaining relevant information, it is as the criterion with the detection of capacitive touch control unit 20.When capacitive touch control unit 20 is not examined
Go out signal, and when pressure touch unit 30 detects signal, the touch-control letter obtained with pressure touch unit 30
Breath is as the criterion.The i.e. detection signal of touch control display apparatus preferential answering capacitive touch control unit 20.It is pointed out that
The position of touch point is only that the one of described pressure touch unit 30 should to utilize the pressure information obtained to judge
With, in other embodiments, utilize the pressure information obtained can also realize other functions, such as at certain
Operation in a little application can directly set the feedback to pressure size.
Under normal circumstances, piezoelectric film sensor 310 also to arrange encapsulated layer, screen outside upper/lower electrode again
Cover layer and basic unit.Owing to flexible PCB 32 can use line layer (the first line layer 322 in such as Fig. 6
4th line layer 328) as screen layer, when piezoelectric film sensor 310 and flexible PCB 32 are integrated,
Screen layer in piezoelectric film sensor 310 then can be substituted by the screen layer of flexible PCB 32.
Fig. 6 A is that the further structure of embodiment described in Fig. 6 simplifies embodiment, i.e. cancels the piezoelectricity in Fig. 6 thin
The upper electrode 312 of film 311 and bottom electrode 313, but directly piezoelectric membrane 311 is affixed to upper two-sided conduction
Glue 330 and under between two-sided conducting resinl 330.As shown in Figure 6A, upper and lower conducting resinl 330 is directly as pressure
The upper/lower electrode of conductive film 311, simplifies pressure touch unit further.
The manufacture method of above-mentioned pressure touch unit 30 is described in conjunction with Fig. 7 to Figure 11 below.
As it is shown in fig. 7, piezoelectric film sensor 310 includes piezoelectric membrane 311, lays respectively at piezoelectric membrane
The upper electrode 312 of 311 both sides and bottom electrode 313, and lay respectively at outside electrode 312 and bottom electrode 313
The upper mould release membrance 314 of side and lower mould release membrance 315.
The material of piezoelectric membrane 311 includes inorganic piezoelectric thin-film material, organic piezoelectric film material, Qi Zhongwu
Machine piezoelectric film material can be zinc-oxide film, Al-Doped ZnO film, PLZT ceramics (PLZT)
Piezoelectric membrane and other piezoceramic material, organic piezoelectric film can be polyvinylidene fluoride (PVDF),
Other polyesters piezoelectric membranes such as porous polypropylene piezoelectric membrane, polylactic acid piezoelectric membrane.Wherein piezoelectric membrane
The thinnest, thickness is 0.05-2 μm.
The concrete preparation process of this piezoelectric film sensor 310 is: provide a piezoelectric membrane；Pass through vaporation-type
The coating process such as plated film, magnetron sputtering formula plated film, spraying plate electrode in the both side surface of piezoelectric membrane；With
Die-cutting mould or alternate manner obtain piezoelectricity circular, square or other solid shape, with upper/lower electrode
Thin-film component；It is covered with mould release membrance on upper/lower electrode surface.It is thusly-formed the piezoelectric membrane sensing shown in Fig. 7
Device 310.In above-mentioned preparation process, first can be covered with mould release membrance on upper/lower electrode surface, then carry out cross cutting
Step.
As shown in Figure 8, flexible PCB 32 includes the first basic unit 321, first line layer the most successively
322, first encapsulated layer the 323, second line layer 324, adhesive layer 325, tertiary circuit layer the 326, second envelope
Dress layer the 327, the 4th line layer 328 and the second basic unit 329.Wherein it is used for arranging piezoelectric film sensor 310
Position, namely the relevant position of adhesive layer 325 arranges the second line layer of hole 320 exposed portion
324 and tertiary circuit layer 326.Before piezoelectric film sensor 310 is not disposed on flexible PCB 32,
Arrange conducting resinl 330 at this hole 320 to turn on the second line layer 324, and another conducting resinl 330 with
Tertiary circuit layer 326 turns on.Between two conducting resinls 330, mould release membrance 331 is set.
Wherein, first encapsulated layer the 323, second encapsulated layer 327 and adhesive layer 325 arrange corresponding passage,
Make the part line conduction on first line layer the 322, the 4th line layer 328 and the second line layer 324, and
Grounding after in application to touch control display apparatus.
As shown in Figure 9 and Figure 10, for the sectional view of interface end and the front elevation of flexible PCB 32.Connecing
At mouth end, second of the upper electrode 312 connecting each piezoelectric film sensor 310 on flexible PCB 32
Line layer 324 is guided to on tertiary circuit layer 326 same plane by corresponding passage, forms multiple letter
Number feeler 333, because of four piezoelectric film sensors 310 integrally disposed on this flexible PCB 32, therefore has
There are four signal feelers 333.It addition, first line layer the 322, the 4th line layer 328 and the second line layer 324
On part line conduction and extend formation ground connection feeler 334, for grounding.Ground connection feeler 334 and letter
Number feeler 333 is in same plane, such that it is able to be just attached with outside adapter.
In certain embodiments, the interface end of flexible PCB 32 also forms one in the outside of the second basic unit 329
Stiffening plate 332.Stiffening plate 332 is for strengthening the physical strength at interface end, and convenient and outside adapter enters
Row connects.Stiffening plate 332 can be by materials such as polyimides (PI) or polyethylene terephthalate (PET)
Formed.
With reference to Figure 11, the detailed preparation process of the flexible PCB 32 of an embodiment is as follows: prepare base material, and
Base material is holed, then carries out heavy copper and copper facing, paste dry film, layers of copper exposure imaging is etched, stripping
The preparation the second line layer containing electrode pattern；Prepare on another base material containing electrode pattern with abovementioned steps
Tertiary circuit layer；Second line layer and tertiary circuit layer are carried out laminate protection；Utilize viscose glue by two
Individual base material (corresponding to two encapsulated layers) residual adhesion, wherein the second route layer and electrode of three-route layer
Pattern is that right opposite is parallel just to placement；Two base materials to adhesion get out the through hole of ground connection, and carry out
Whole heavy copper facing, i.e. forms first line layer and the 4th line layer, now first line layer, the 4th line layer
Have been turned on the part circuit of the second line layer；PI is covered on the surface of first line layer and the 4th line layer
Material or PET material carry out laminating operation, to form the first basic unit and the second basic unit；Outside the second basic unit
Side forms the stiffening plate being made up of PI or PET again；Last stamping-out, and place piezoelectric film sensor being used for
Position (namely part of two non-adhesions of base material) stick the upper and lower two-sided conducting resinl of band mould release membrance, obtain
Obtain the flexible PCB of structure as shown in Figure 8.The flexible PCB prepared carries out the step packed again.
Piezoelectric film sensor 310 with the integrated step of flexible PCB 32 is: by the flexible electrical shown in Fig. 8
Structure on the related mould release membrance of mould release membrance 331 331 in road plate 32 (includes conducting resinl the 330, second circuit
Layer the 324, first encapsulated layer 323, first line layer 322 and the first basic unit 321) tear up a part, will figure
Lower mould release membrance 315 in piezoelectric film sensor 310 shown in 7 tears off, and makes the piezoelectric membrane 311 exposed
Bond with the conducting resinl 330 below mould release membrance 331 that is positioned in flexible PCB 32；Tear pressure the most respectively off
Upper mould release membrance 314 in conductive film sensor 310 and the mould release membrance 331 in flexible PCB 32, by piezoelectricity
Thin film 311 bonds with another conducting resinl 330 in flexible PCB 32.
When piezoelectric film sensor 310 is integrated in flexible PCB 32, in flexible PCB 32
One line layer 322 and the 4th line layer 328 act as screen layer, due to the grounding of screen layer, and will not
External electrical field is made to affect the charge signal of piezoelectric film sensor 310.
By mode integrated to pressure transducer and flexible PCB, it is possible to when solving to use multiple pressure transducer
Winding displacement is complicated, install the problems such as inconvenience, but also can apply to the detection of the power of curved surface or multi-surface object.
Use two-sided conducting resinl simultaneously in the way of gluing, can quickly and conveniently realize piezoelectricity at a lower temperature
Sensing element is integrated with flexible PCB.
In certain embodiments, the piezoelectric film sensor in the pressure touch unit that the present invention provides, its pressure
The upper/lower electrode of conductive film both sides can also use two-sided conducting resinl material, and two-sided conducting resinl material is except as pressure
Outside conductive film is with the connecting material of flexible PCB, also as the electrode material of piezoelectric membrane.
Although charge inducing can be produced after piezoelectric membrane stress on its surface, but the surface of piezoelectric membrane is not led
Electricity, it is therefore desirable to the charge inducing signal on its surface is transferred out by the material of conduction.Two-sided conducting resinl removes will
Outside piezoelectric membrane is with flexible PCB adhesion, the charge inducing signal also produced on piezoelectric membrane surface is by soft
Line layer in property circuit board is transmitted.The area of two-sided conducting resinl is identical with the surface area of piezoelectric membrane,
Or it is slightly less than the surface area (the most two-sided conducting resinl exists certain inside contracting) of piezoelectric membrane.
On the other hand, the touch control display apparatus that the present invention provides, its pressure touch unit fits in the base of conduction
On material, utilize electric conductivity and the ground connection attribute of base material, can reduce or remit in piezoelectric film sensor to resist electricity
Magnetic shield and the screen layer that arranges, thus reduce the thickness of pressure touch unit, and then reduce touch-control display dress
The integral thickness put.Such as this pressure touch unit can fit in mobile phone, flat board electricity by two-sided conducting resinl
On the casing center of brain, or with metal-back or on display unit that surface is with conductive layer, will lead
Electric layer is as the electro-magnetic screen layer of piezoelectric film sensor.
This pressure touch unit can be detected by the multiple piezoelectric film sensors arranged and be applied to piezoelectric membrane
The size information of the power of sensor present position.Meanwhile, this pressure touch unit is permissible by flexible PCB
Two or more piezoelectric film sensors are made integrated approach so that it is there is the size simultaneously detecting multiple power
Effect of information, simplifies the winding displacement complexity of multiple piezoelectric film sensor and the lengthy and tedious journey of assembling simultaneously
Degree.
In one embodiment, the flexible PCB in pressure touch unit can be two-layer line layer structure, wherein
One sandwich circuit layer is as electro-magnetic screen layer, and another sandwich circuit layer is as the signals layer of piezoelectric film sensor.As
Shown in Figure 12, it it is a kind of pressure touch that piezoelectric film sensor 510 is integrated on flexible PCB 52
The cross section structure signal of unit 50.
This flexible PCB 52 includes the first basic unit 521, first line layer 522, gluing the most successively
Layer the 523, second line layer 524 and the second basic unit 525.First the 521, second basic unit 525 of basic unit can be
The material such as polyimides or polyester PET is made, and first line layer 522 and the second line layer 524 can be copper
Layer or other metal/alloy material are constituted.The relevant position of adhesive layer 523 arranges hole 520 exposed portion
First line layer 522 and the second line layer 524.This hole 520 is used for housing piezoelectric film sensor 510.
Piezoelectric film sensor 510 includes piezoelectric membrane 511 and lays respectively at piezoelectric membrane 511 both sides
Upper conducting resinl 512 and lower conducting resinl 513.Upper conducting resinl 512 bonds with first line layer 522, lower conducting resinl
513 bond with the second line layer 524, and upper conducting resinl 512 and lower conducting resinl 513 are as piezoelectric film sensor
Two electrodes of 510, the most also as the connector with flexible PCB 52, and by piezoelectric film sensor
The 510 charge inducing signals produced transmit to the line layer of flexible PCB 52.In the structure shown in Figure 12
In, first line layer 522 can be as electro-magnetic screen layer, for the conductive layer of whole, and at adhesive layer 523
Correct position at through hole is set, make part circuit in first line layer 522 and the second line layer 524 even
Connect.
Figure 13 and Figure 14 respectively illustrates this flexible PCB 52 cross section at interface end and front view.
After part connection in first line layer 522 and the second line layer 524, connecing of flexible PCB 52
Mouth end draws ground connection feeler 534.Additionally, when the integrated multiple piezoelectric film sensors 510 of flexible PCB 52
Time, the charge signal transmission of multiple piezoelectric film sensors 510 all occurs in the second line layer 524, and
Interface end at flexible PCB 52 draws a signal feeler 533 respectively.Figure 14 showing, four signals touch
Angle 533, this flexible PCB 52 is integrated with four piezoelectric film sensors 510.In certain embodiments,
The interface end of flexible PCB 52 also forms a stiffening plate 532 in the outside of the second basic unit 525.Stiffening plate 532
For strengthening the physical strength at interface end, convenient and outside adapter is attached.Stiffening plate 532 can
Formed by materials such as polyimides (PI) or polyethylene terephthalate (PET).
Figure 15 is the structural representation that this pressure touch unit 50 applies to a touch control display apparatus.This pressure
One side (lower surface in such as Figure 15) of touch control unit 50 by viscose glue such as optical cement OCA,
Glues etc. fit in casing 90 surface of touch control display apparatus, and the casing 90 of the grounding of conduction serves
The effect of electromagnetic shielding；Meanwhile, another side (upper in such as Figure 15 of this pressure touch unit 50
Surface) fit in the side of capacitive touch control unit 20, capacitive touch control unit 20 can be include in-cell and
On-cell structure is in interior various capacitance touching control solutions.The most in certain embodiments, this pressure touch
Another side of unit 50 can also fit in the side of cover sheet, or fits in display module
Side.
In other embodiment, the flexible PCB in pressure touch unit can only have a sandwich circuit
Layer, and the first basic unit and the second basic unit is formed respectively in line layer both sides.Circuit due to this flexible PCB
Layer is only used as the signal transmitting layer for transmitting the charge signal that piezoelectric film sensor produces, therefore this pressure
Touch control unit is applied to be fitted in its both sides and all conducts electricity and in the touch control display apparatus of grounding, utilize touch-control
The conductive structure of display device realizes electromagnetic shielding action.This kind of scheme eliminates in piezoelectric film sensor
Electro-magnetic screen layer, therefore has less thickness.
The most as shown in Figure 16, the flexible PCB 62 in pressure touch unit 60 wraps the most successively
Include the first basic unit 621, first line layer 622 and the second basic unit 623.First the 621, second basic unit 623 of basic unit
Can be that the material such as polyimides or polyester PET is made, first line layer 622 can be layers of copper or other gold
Genus/alloy material is constituted.The relevant position of the second basic unit 623 arranges the First Line of hole 620 exposed portion
Road floor 622.This hole 620 is used for housing piezoelectric film sensor 610.
Piezoelectric film sensor 610 includes piezoelectric membrane 611 and lays respectively at piezoelectric membrane 611 both sides
Upper conducting resinl 612 and lower conducting resinl 613.Upper conducting resinl 612 bonds with first line layer 622.Lower conducting resinl
613 for bonding with the corresponding construction in touch control display apparatus.Upper conducting resinl 612 and the conduct of lower conducting resinl 613
Two electrodes of piezoelectric film sensor 610.
Figure 17 and Figure 18 respectively illustrates this flexible PCB 62 cross section at interface end and front view.
First line layer 622 draws signal feeler 633 in the interface end of flexible PCB 62.Due to this first line
Layer 622 is only used as signal transmission, does not play electromagnetic shielding action, does not therefore have corresponding circuit to draw ground connection and touches
Angle.When flexible PCB 56 integrated multiple piezoelectric film sensor 610, multiple piezoelectric film sensors 610
Charge signal transmission all occur in first line layer 622.Figure 18 shows five signal feelers 633,
Five piezoelectric film sensors 610 it are integrated with on this flexible PCB 62.In certain embodiments, flexible electrical
The interface end of road plate 62 also forms a stiffening plate 632 in the outside of the second basic unit 623.Stiffening plate 632 is used for
Strengthening the physical strength at interface end, convenient and outside adapter is attached.Stiffening plate 632 can be by gathering
The materials such as acid imide (PI) or polyethylene terephthalate (PET) are formed.
Figure 19 is the structural representation that this pressure touch unit 60 applies to a touch control display apparatus.This pressure
The side (lower surface in such as Figure 19) of touch control unit 60 fits in casing 90 table of touch control display apparatus
Face, the casing 90 of the grounding of conduction serves the effect of electromagnetic shielding；Meanwhile, this pressure touch unit
Another side (upper surface in such as Figure 19) of 60 utilizes viscose glue 41 such as optical cement OCA, glue
Side etc. the display unit 40 fitting in band metal frame.Utilize casing 90 and the ground connection of display unit 40
Attribute realizes shielding periphery electromagnetic environment to first in piezoelectric film sensor 610 and flexible PCB 62
The interference of the charge signal in line layer 622.Further, casing 90 and the second of flexible PCB 62
Adhesive layer 91 e.g. foam rubber, double faced adhesive tape etc. can be set between basic unit 623 to flexible PCB 62 and machine
It is fixed between shell 90.
It is to be appreciated that above-mentioned display unit 40 can also be the display module of nonmetal frame, but at its table
Face one layer of conductive layer of plating grounding.It is to be appreciated that in other embodiments, this pressure touch unit
Can fit with capacitive touch control unit in another side of 60, capacitive touch control unit can be various types of electricity
Hold touch-control solution, it is also possible to be the capacitance touching control display module of capacitance touching control and display module integration.
As shown in figure 20, the piezoelectricity that the pressure touch unit 70 that another embodiment of the present invention provides is comprised is thin
Film sensors 710 include piezoelectric membrane 711, the upper electrode 712 laying respectively at piezoelectric membrane 711 both sides and under
Electrode 713.Upper electrode 712 and bottom electrode 713 are conducting resinl.The two-sided conduction of piezoelectric membrane 711 both sides
Glue not only plays the effect of piezoelectric membrane upper/lower electrode, is also carrying out with flexible PCB 72 and with other base material
Adhesion effect is played during assembling.Upper electrode 712, the surface area of bottom electrode 713 and the surface of piezoelectric membrane 711
Long-pending identical, or it is slightly less than the surface area of piezoelectric membrane 711.
The flexible PCB 72 that the pressure touch unit 70 that another embodiment of the present invention provides is comprised, by up to
Under include the first basic unit 721, first line layer 722, encapsulated layer the 723, second line layer 724 and successively
Two basic units 725.Encapsulated layer and basic unit can be made up of the material such as polyimides or polyester PET.First line
Layer the 722, second line layer 724 can be the conductive layer of layers of copper or other metal or alloy.First line layer
722 is the conductive layer of whole, by arranging passage in the relevant position of encapsulated layer 723, makes first line layer
722 and the second part line conductions in line layer 724, and by described part circuit grounding, to rise
Effect to electromagnetic shielding.Second line layer 724 is the signal transmitting layer of flexible PCB 72, piezoelectric membrane
The signal of telecommunication that sensor 710 produces, is transferred to the interface end of flexible PCB 72 by the second line layer 724.
Hole 720 is set in second basic unit 725 for housing piezoelectric film sensor 710.This hole 720 exposed division
The second line layer 724 divided connects for the upper electrode 712 of piezoelectric film sensor 710.
As shown in figure 21 and figure, for the sectional view of interface end and the front elevation of flexible PCB 72.Connecing
At mouth end, second of the upper electrode 712 connecting each piezoelectric film sensor 710 on flexible PCB 72
Line layer 724 draws multiple signal feeler 733.It addition, in first line layer 722 and the second line layer 724
Part line conduction and draw ground connection feeler 734 for grounding.Ground connection feeler 734 and signal feeler
733 are generally aligned in the same plane, such that it is able to be attached with outside adapter.
The charge inducing that piezoelectric film sensor 710 produces is transferred to flexible PCB 72 by upper electrode 712
In the second line layer 724；Bottom electrode 713 is directly connected with the base material of touch control display apparatus, for making piezoelectricity thin
Film sensors 710 be capable of resist electromagnetic interference, bottom electrode 713 should with conduction ground connection base material be connected with
Being grounded effect, therefore bottom electrode 713 can be with bonded metal or the casing of alloy material, or splicing tape
There is a display unit of metal frame, or be coated with the display unit of the conductive layers such as metal grounding, make lower electricity
Pole 713 and metal frame or conductive layer conducting.
In above-mentioned pressure touch unit 70, by the first line layer 722 in flexible PCB 72 and piezoelectricity
Bottom electrode 713 in thin film sensor 710, as the ground shield of piezoelectric film sensor 710, is having
Effect this pressure touch unit 70 of reduction, by while electromagnetic interference, reduces the thickness of pressure touch unit 70
Degree.
Piezoelectric film sensor 710 in the present invention can be by multiple piezoelectric membranes with the integrated of flexible PCB 72
Sensor 710 is assembled in a flexible PCB 72 simultaneously, and each piezoelectric film sensor 710 produces
Charge signal is transferred to the interface end of flexible PCB 72 by the second line layer 724.First line layer 722
The second line layer to flexible PCB 72 is guided by the way of passage is set on the first encapsulated layer 723
In the part circuit of 724, thus the signal finally connecting the upper electrode 712 of each piezoelectric film sensor 710 touches
Angle 733 and the ground connection feeler 734 for ground connection are generally aligned in the same plane at interface end, thus realize with another
Outer adapter carries out ZIF plug-in type or BTB press-button type connects.
In certain embodiments, the interface end of flexible PCB 32 also forms one in the outside of the first basic unit 721
Stiffening plate 732.Stiffening plate 732 is for strengthening the physical strength at interface end, and convenient and outside adapter enters
Row connects.Stiffening plate 732 can be by materials such as polyimides (PI) or polyethylene terephthalate (PET)
Matter is formed.
Below in conjunction with Figure 23, the above-mentioned pressure touch unit 70 integrated step in touch control display apparatus is described.
Figure 23 shows that the piezoelectric film sensor 710 in pressure touch unit 70 is by bottom electrode 713 and touch-control
Conductive base in display device is bonding.This conductive base can be conduction casing 90, it is also possible to be with
The display unit 40 of metal frame, or it is coated with the display unit 40 of conductive layer.Wherein flexible PCB 72
Second base material 725 is by adhesive layer 91 e.g. foam rubber, double faced adhesive tape etc. and casing 90 or display unit 40
It is adhesively fixed.
Piezoelectric film sensor 710 that above-mentioned pressure touch unit 70 is comprised and the collection of flexible PCB 72
One-tenth method can include following flow process:
One, the preparation of flexible PCB, contains the soft of two line layers according to the technique preparation above addressed
Property circuit board.Wherein first line layer and the second line layer are by the passage arranged in encapsulated layer so that the
Part line conduction in one line layer and the second line layer, and draw at the interface end of flexible PCB and connect
Ground feeler is for ground connection.The quantity of the second line layer integrated piezoelectric thin film sensor the most according to schedule and position
Carry out cabling design.Wherein the correct position of the second basic unit arranges hole, with the second line layer of exposed portion,
It is used for piezoelectric film sensor is installed at this hole.
Two, two-sided conducting resinl is fitted in respectively two sides of piezoelectric membrane；
Three, the piezoelectric membrane being fitted with upper and lower conducting resinl is fitted at the hole of flexible PCB, and make it
In a conducting resinl be adhesively fixed with the second line layer exposed；The most above-mentioned step 2 and step 3 tool
Body order can be adjusted flexibly, and such as conducting resinl can first fit at the hole of flexible PCB and the second circuit
Layer bonding, then piezoelectric membrane is covered on this conducting resinl；
Four, second basic unit's lower surface at flexible PCB sticks foam rubber, the wherein pressure on flexible PCB
Conductive film sensor is exposed outside, is not covered by foam rubber；The most again this pressure touch unit is fitted to
On the display unit that the casing of conduction or bonnet surface earthing process, when the thickness of foam rubber is slightly larger than containing two-layer
During the thickness of the piezoelectric film sensor of conducting resinl, can set in the position that casing is docked with piezoelectric film sensor
Put a bulge-structure；By increasing the thickness of piezoelectric film sensor and the thickness of foam rubber can also be reduced simultaneously
Degree, the thickness of the two-sided conducting resinl of two-layer is close with the thickness of foam rubber to make piezoelectric film sensor add, then machine
Shell or display unit need not still further arrange bulge-structure, just can fit with this pressure touch unit.
Figure 24 and Figure 25 shows the concrete application in a touch control display apparatus of the above-mentioned pressure touch unit.
This touch control display apparatus includes casing 90 and cover sheet 10, capacitive touch control unit 20, display unit 40 and
Pressure touch unit 70 is arranged in the containing cavity of casing and cover sheet 10 formation.Pressure touch unit 70
May be provided between display unit 40 and casing 90.Wherein, capacitive touch control unit 20 can be that external hanging type touches
Prosecutor case, can also be in-cell or on-cell organization plan, namely capacitive touch control unit 20 and display unit
40 is integrally disposed.In certain embodiments, the piezoelectric membrane sensing of casing 90 corresponding pressure touch control unit 70
The position of device 710 is provided with protruding 92, to avoid in pressure touch unit 70 because using the structure bands such as adhesive layer
The problem that the height come differs has influence on assembly precision.During for reducing pressing screen, projection 92 is to display unit 40
The impact of display effect, display unit 40 preferably employs the display module with metal frame.
Each technical characteristic of embodiment described above can combine arbitrarily, for making description succinct, the most right
The all possible combination of each technical characteristic in above-described embodiment is all described, but, if these skills
There is not contradiction in the combination of art feature, is all considered to be the scope that this specification is recorded.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed,
But can not therefore be construed as limiting the scope of the patent.It should be pointed out that, for this area
For those of ordinary skill, without departing from the inventive concept of the premise, it is also possible to make some deformation and change
Entering, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be with appended power
Profit requires to be as the criterion.
Claims (11)
1. a pressure touch unit, it is characterised in that include flexible PCB and be arranged on flexible PCB
On piezoelectric film sensor, wherein:
Described flexible PCB includes the first basic unit, first line layer and the second basic unit set gradually, described
The first line layer of hole exposed portion is set in the second basic unit；
Described piezoelectric film sensor include piezoelectric membrane and lay respectively at piezoelectric membrane both sides upper conducting resinl and
Lower conducting resinl, described piezoelectric film sensor is arranged at the described hole of flexible PCB, and described on lead
Electricity glue and first line layer bond, described upper conducting resinl as the upper electrode of piezoelectric film sensor, described under
Conducting resinl is as the bottom electrode of piezoelectric film sensor.
Pressure touch unit the most according to claim 1, it is characterised in that the interface of flexible PCB
End also forms a stiffening plate in the outside of the first basic unit.
3. a touch control display apparatus, including the pressure touch list described in display unit, claim 1 or 2
Unit and casing, described casing conduction and ground connection, lead under the piezoelectric film sensor of described pressure touch unit
Electricity glue is bonding with casing, and described display unit has metal frame or conductive layer, the of described pressure touch unit
One basic unit is bonding with display unit by viscose glue.
Touch control display apparatus the most according to claim 3, it is characterised in that described pressure touch unit
The second basic unit and casing between by adhesive layer bonding.
5. a pressure touch unit, it is characterised in that include flexible PCB and be arranged on flexible PCB
On piezoelectric film sensor, wherein:
The first basic unit that described flexible PCB includes setting gradually, first line layer, encapsulated layer, the second line
Road floor and the second basic unit, described second basic unit arranges the second line layer of hole exposed portion；
Described piezoelectric film sensor include piezoelectric membrane and lay respectively at piezoelectric membrane both sides upper conducting resinl and
Lower conducting resinl, described piezoelectric film sensor is arranged at the described hole of flexible PCB, and described on lead
Electricity glue and the second line layer bond, described upper conducting resinl as the upper electrode of piezoelectric film sensor, described under
Conducting resinl is as the bottom electrode of piezoelectric film sensor.
Pressure touch unit the most according to claim 5, it is characterised in that described second line layer is made
For the charge signal transport layer of piezoelectric film sensor, described second line layer is in the interface end of flexible PCB
Draw signal feeler, at flexible circuit after the part connection in described first line layer and the second line layer
The interface end of plate draws ground connection feeler, and described signal feeler is generally aligned in the same plane with ground connection feeler.
Pressure touch unit the most according to claim 5, it is characterised in that described first line layer is
The conductive layer of whole is using as electro-magnetic screen layer, and described encapsulated layer is provided with passage, makes first line layer and second
Part connection in line layer by described part line-to-ground.
Pressure touch unit the most according to claim 5, it is characterised in that the interface of flexible PCB
End also forms a stiffening plate in the outside of the first basic unit.
9. a touch control display apparatus, including the pressure described in any one in casing and claim 5-8 item
Power touch control unit, described casing conduction and grounding, the piezoelectric film sensor of described pressure touch unit
Lower conducting resinl bonding with casing.
Touch control display apparatus the most according to claim 9, it is characterised in that also include display unit,
Capacitive touch control unit and cover sheet, described display unit, capacitive touch control unit and cover sheet set gradually
In the first basic unit of the flexible PCB of described pressure touch unit.
11. 1 kinds of touch control display apparatus, including the pressure touch list described in any one in claim 5-8 item
Unit, and display unit, described display unit has metal frame or a conductive layer, described metal frame or lead
Electric layer ground connection, the lower conducting resinl of the piezoelectric film sensor of described pressure touch unit is bonding with display unit also
Turn on described metal frame or conductive layer.
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| CN109085945A (en) * | 2017-06-13 | 2018-12-25 | 三星显示有限公司 | Show equipment |
| CN109085945B (en) * | 2017-06-13 | 2023-04-07 | 三星显示有限公司 | Display device |
| CN107300999B (en) * | 2017-07-07 | 2022-11-25 | 安徽精卓光显技术有限责任公司 | Pressure-sensitive touch display screen, pressure-sensitive touch screen and manufacturing method thereof |
| CN107300999A (en) * | 2017-07-07 | 2017-10-27 | 南昌欧菲光科技有限公司 | Pressure sensitive touch display screen, pressure sensitive touch-screen and preparation method thereof |
| GB2608676A (en) * | 2019-03-29 | 2023-01-11 | Lg Display Co Ltd | Display panel and display apparatus including the same |
| GB2584354B (en) * | 2019-03-29 | 2022-07-13 | Lg Display Co Ltd | Display panel and display apparatus including the same |
| US11095963B2 (en) | 2019-03-29 | 2021-08-17 | Lg Display Co., Ltd. | Display panel and display apparatus including the same |
| US11601738B2 (en) | 2019-03-29 | 2023-03-07 | Lg Display Co., Ltd. | Display panel and display apparatus including the same |
| GB2584354A (en) * | 2019-03-29 | 2020-12-02 | Lg Display Co Ltd | Display panel and display apparatus including the same |
| GB2608676B (en) * | 2019-03-29 | 2023-08-30 | Lg Display Co Ltd | Display panel and display apparatus including the same |
| GB2617930A (en) * | 2019-03-29 | 2023-10-25 | Lg Display Co Ltd | Display panel and display apparatus including the same |
| GB2617930B (en) * | 2019-03-29 | 2024-01-31 | Lg Display Co Ltd | Display panel and display apparatus including the same |
| US11910143B2 (en) | 2019-03-29 | 2024-02-20 | Lg Display Co., Ltd. | Display panel and display apparatus including the same |
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|---|---|
| CN106293280B (en) | 2023-10-24 |
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