CN104881193B - Touch control display apparatus, pressure touch unit and preparation method thereof - Google Patents
Touch control display apparatus, pressure touch unit and preparation method thereof Download PDFInfo
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Abstract
The production method of touch control display apparatus and the pressure touch unit the present invention relates to a kind of pressure touch unit and using the pressure touch unit.The flexible circuit board includes the first base set gradually, first line layer, the first encapsulated layer, the second line layer, adhesive layer, tertiary circuit layer, the second encapsulated layer, the 4th line layer and the second base, setting hole and the second line layer and tertiary circuit layer of exposed portion on the adhesive-layer.The piezoelectric film sensor includes piezoelectric membrane and the top electrode for being located at piezoelectric membrane two sides and lower electrode, the piezoelectric film sensor is arranged at the described hole of flexible circuit board, and the top electrode is connected with the second line layer, the lower electrode is connected with tertiary circuit layer.Piezoelectric film sensor is integrally disposed on flexible circuit board, the winding displacement design of piezoelectric film sensor can be simplified, while being conducive to assembling of the pressure touch unit in touch control display apparatus.
Description
Technical field
The invention belongs to touch-control display fields, are related to a kind of touch control display apparatus, more particularly to one kind there is pressure to pass
Feel the touch control display apparatus and pressure touch unit and preparation method thereof of effect.
Background technique
Currently, having the electronic products such as mobile phone, tablet computer, the TV of touch function to use capacitive touch more and more
Prosecutor case.However, also there are many defects in capacitance type touch control screen, such as when the palm or conductor of larger area are close to capacitive touch
The erroneous judgement of capacitance type touch control screen is shielded rather than can be caused when touching in control；In a humid environment or capacitance touching control screen surfaces exist
When water droplet, spot, it can also cause the maloperation of capacitance type touch control screen or operation insensitive；In addition, the hand with gloves cannot be used
Or it holds nonconducting object and carries out normal operating capacitance type touch control screen.
It can cause the maloperation problem of capacitance type touch control screen for capacitance type touch control screen surface moisture or when depositing spot, at present
Satisfactory scheme not yet occur can be resolved.There is part manufacturer to pass through the sides such as the sensitivity of raising capacitance type touch control screen
Touch control operation effect when formula improves with gloves, but this scheme can make the capacitance type touch control screen when operating without gloves excessively clever
Quick and generate maloperation, in addition this scheme can not solve the touch control operation of nonconducting object.There are also part manufacturers to pass through knot
Close the touch scheme for using pressure sensor, but it is difficult, at high cost there are assembly the defects of.
Summary of the invention
Based on this, it is necessary in view of the above-mentioned problems, providing a kind of pressure touch unit and using the pressure touch unit
The production method of touch control display apparatus and pressure touch unit.
A kind of pressure touch unit is sensed including flexible circuit board and the piezoelectric membrane being arranged on flexible circuit board
Device, wherein：
The flexible circuit board includes the first base set gradually, first line layer, the first encapsulated layer, the second route
Hole is arranged on the adhesive layer and reveals for layer, adhesive layer, tertiary circuit layer, the second encapsulated layer, the 4th line layer and the second base
The second line layer and tertiary circuit layer of part out；
The piezoelectric film sensor include piezoelectric membrane and be located at piezoelectric membrane two sides top electrode and lower electrode,
The piezoelectric film sensor is arranged at the described hole of flexible circuit board, and the top electrode is connected with the second line layer,
The lower electrode is connected with tertiary circuit layer.
Piezoelectric film sensor is integrally disposed on flexible circuit board by above-mentioned pressure touch unit, can simplify pressure sensing
The winding displacement of device designs, while being conducive to assembling of the pressure touch unit in touch control display apparatus.
The top electrode is connected with the second line layer by conducting resinl in one of the embodiments, the lower electrode with
Tertiary circuit layer is connected by another conducting resinl.
In one of the embodiments, first encapsulated layer, the second encapsulated layer, corresponding channel is set on adhesive layer,
So that the part line conduction on first line layer, the 4th line layer and the second line layer, and it is used for grounding, make First Line
Road floor and the 4th line layer are as electro-magnetic screen layer.
The interface end of the flexible circuit board also forms a reinforcement in the outside of the second base in one of the embodiments,
Plate.
A kind of touch control display apparatus, including any one of the above pressure touch unit.
A kind of production method of pressure touch unit, includes the following steps：
There is provided piezoelectric film sensor, including piezoelectric membrane, be located at piezoelectric membrane two sides top electrode and lower electrode,
And it is located at upper release film and lower release film on the outside of top electrode and lower electrode；
There is provided flexible circuit board, including set gradually the first base, first line layer, the first encapsulated layer, the second route
Layer, adhesive layer, tertiary circuit layer, the second encapsulated layer, the 4th line layer and the second base, wherein the corresponding position setting of adhesive layer
The second line layer and tertiary circuit layer of hole and exposed portion, setting conducting resinl is connected with the second line layer at the hole, with
And another conducting resinl is connected with tertiary circuit layer, and release film is arranged between two conducting resinls；
By in piezoelectric film sensor upper release film and the removal of lower release film, and remove release in flexible circuit board
Piezoelectric film sensor is arranged in hole in film, and top electrode and conductive adhesive, lower electrode and another conductive adhesive.
The preparation step of the piezoelectric film sensor includes in one of the embodiments,：One piezoelectric membrane is provided；It is pressing
The both side surface of conductive film makes top electrode and lower electrode respectively；Cross cutting has the piezoelectric membrane of upper/lower electrode；And it is powering on
Upper release film, release film under being formed in lower electrode surface are formed in pole surface.
The making step of the flexible circuit board includes in one of the embodiments,：Prepare substrate, and is bored on substrate
Then hole prepares the second line layer containing electrode pattern；The tertiary circuit layer containing electrode pattern is prepared on another substrate；
Laminate protection is carried out to the second line layer and tertiary circuit layer；Using gluing by two base material part adhesions, wherein second
Route layer and the electrode pattern of third route layer are that the parallel face of right opposite is placed；Two substrates of adhesion are carried out drilling out ground connection
Through-hole, and form first line layer and the 4th line layer, the partial line of first line layer, the 4th line layer and the second line layer
Road conducting；The first base and the second base are formed on the surface of first line layer and the 4th line layer；And punching, and at two
Stick the conducting resinl up and down with release film in the part of the non-adhesion of substrate.
The making step of the flexible circuit board further includes re-forming on the outside of the second base in one of the embodiments,
The step of stiffening plate.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the touch control display apparatus that one embodiment of the invention provides；
Fig. 2 is the cross section structure schematic diagram of touch control display apparatus shown in Fig. 1；
Fig. 3 and Fig. 4 is the cross section structure schematic diagram for the touch control display apparatus that different embodiments of the invention provide；
Fig. 5 is the structural schematic diagram for the pressure touch unit that one embodiment of the invention provides；
Fig. 6 is the cross section structure schematic diagram of pressure touch unit shown in Fig. 5；
Fig. 6 A is similar to Fig. 6, shows the cross section structure for the pressure touch unit that another embodiment provides；
Fig. 7 is the structural schematic diagram for the piezoelectric film sensor that one embodiment of the invention provides；
Fig. 8 is the structural representation for the flexible circuit board for integrating piezoelectric film sensor that one embodiment of the invention provides
Figure；
Fig. 9 and Figure 10 is the sectional view and front elevation of the interface end of flexible circuit board shown in Fig. 8；
Figure 11 is the stream of flexible circuit board of the production that provides of one embodiment of the invention for integrating piezoelectric film sensor
Cheng Tu；
Figure 12 be another embodiment of the present invention provides pressure touch unit cross section structure schematic diagram；
Figure 13 and Figure 14 is sectional view at interface end of flexible circuit board shown in Figure 12 in pressure touch unit and just
Face figure；
Figure 15 is the cross section structure schematic diagram of the touch control display apparatus for the pressure touch unit that application drawing 12 provides；
Figure 16 be another embodiment of the present invention provides pressure touch unit cross section structure schematic diagram；
Figure 17 and Figure 18 is sectional view at interface end of flexible circuit board shown in Figure 16 in pressure touch unit and just
Face figure；
Figure 19 is the cross section structure schematic diagram of the touch control display apparatus for the pressure touch unit that application drawing 16 provides；
Figure 20 be another embodiment of the present invention provides pressure touch unit cross section structure schematic diagram；
Figure 21 and Figure 22 is sectional view at interface end of flexible circuit board shown in Figure 20 in pressure touch unit and just
Face figure；
Figure 23 is the cross section structure schematic diagram of the touch control display apparatus for the pressure touch unit that application drawing 20 provides；
Figure 24 and Figure 25 be another embodiment of the present invention provides touch control display apparatus different perspectives structural schematic diagram.
Specific embodiment
As depicted in figs. 1 and 2, a kind of touch control display apparatus that one embodiment of the invention provides includes cover sheet 10, electricity
Hold touch control unit 20, pressure touch unit 30 and display unit 40.When user operates the touch control display apparatus, Ke Yitong
The location information that capacitive touch control unit 20 judges touch point is crossed, meanwhile, judge that touch point is applied by pressure touch unit 30
Pressure information, then realize specific function using the pressure information.
Cover sheet 10 can be strengthened glass cover board, plastic cover plate, polymethyl methacrylate (PMMA) cover board etc..
The flexible circuit board 22 and electricity that capacitive touch control unit 20 includes capacitance sensor 21, connect with capacitance sensor 21
Hold touch chip (not shown).Capacitance sensor 21 includes multiple driving electrodes and induction electrode, and (figure is not for both touch control electrodes
Show) it can be distributed in same substrate (not shown), or it is distributed in two different substrates respectively, which can be with shape
Cover sheet 10 is made to have both the function of capacitance sensor at the medial surface in cover sheet 10.It can also be formed in and fit in
The surface of the insulating substrate of cover sheet 10.Capacitance sensor 21 further includes that the leading electrode conducted with touch control electrode (is schemed not
Show, such as silver paste), leading electrode leads to touch control electrode at one, and passes through anisotropic conductive adhesive paste (ACF) and flexible circuit board
22 bindings.Capacitance touching control chip can be set on the flexible circuit board 22 of capacitive touch control unit 20, also can be set in touch-control
It, can be by the capacitance touching control of capacitive touch control unit 20 on the mainboard of display device, such as when the touch control display apparatus is mobile phone
Chip integration is arranged on the mainboard of mobile phone.
Capacitive touch control unit 20 can detect the precise position information for obtaining multiple touch points by capacity coupled mode.
Pressure touch unit 30 includes flexible circuit board 32, and three on flexible circuit board 32 or three or more are arranged in
Pressure sensor 31, and control chip (not shown).Pressure sensor 31 can be piezoelectric film sensor, resistance-type power passes
The force snesor of the types such as sensor, capacitive force transducer or metal strain meter.
In the present embodiment, pressure touch unit 30 is located at side of the capacitive touch control unit 20 far from cover sheet 10.Change speech
It, in the present embodiment, cover sheet 10, capacitive touch control unit 20, pressure touch unit 30 in the touch control display apparatus and aobvious
Show that unit 40 is set gradually.
As shown in Figure 3, in some embodiments, pressure touch unit 30 may be alternatively located at display unit 40 far from capacitive touch
The side of unit 20 is controlled, display unit 40 is then located at side of the capacitive touch control unit 20 far from cover sheet 10.In the embodiment,
Cover sheet 10, capacitive touch control unit 20, display unit 40 and pressure touch unit 30 in the touch control display apparatus are successively set
It sets.
As shown in Figure 4, in some embodiments, pressure touch unit 30 can also be directly in the one of cover sheet 10
Side.In the embodiment, cover sheet 10, pressure touch unit 30, capacitive touch control unit 20 in the touch control display apparatus and aobvious
Show that unit 40 is set gradually.
Pressure sensor 31 can be distributed in the corner of pressure touch unit 30.As shown in fig. 1, pressure sensor 31 is
It four, is separately positioned at four endpoints of flexible circuit board 32, which is distributed in the four of touch control display apparatus
A corner.
The control chip of pressure touch unit 30, which can be integrated, to be arranged on the mainboard of the touch control display apparatus, or is arranged soft
On property circuit board 32, and reach electric connection with flexible circuit board 32.
The present invention, which combines pressure sensor 31, to be arranged on flexible circuit board 32, and the route on flexible circuit board 32 will press
Force snesor 31 and external control chip electrically conducting, can be improved the integrated level of pressure touch unit 30 in this way,
Convenient for subsequent assembling.
It below will be by taking pressure sensor 31 selects piezoelectric film sensor as an example, to the specific knot of the pressure touch unit 30
Structure and setting are described further.
As shown in Figure 5 and Figure 6, in an embodiment, pressure touch unit 30 includes piezoelectric film sensor 310, flexible electrical
Road plate 32, control chip.Control chip may include first devices such as operational amplifier 33, single-chip microcontroller (containing A/D converter, not shown)
Part.
According to the specific setting position of pressure touch unit 30, can be shown by double-sided adhesive, glue or foam rubber and touch-control
Casing (not shown), cover sheet 10, capacitive touch control unit 20 or the display unit 40 of device are bonded.
For the cost for reducing pressure touch unit 30, the utilization rate of flexible circuit board 32 is improved, integrated piezoelectric film passes
The flexible circuit board 32 of sensor 310 can be an entirety, or as shown in Figure 5, including two or more flexible circuit boards
32, can be, for example, by connection structure 320 between multiple flexible circuit boards 32 zero insertion force (Zero Insertion Force,
ZIF) connected structure or plate reach connection to plate (Board To Board, BTB) snap fastener structure.
It is illustrated in figure 6 the schematic cross-section of flexible circuit board 32 Yu 310 junction of piezoelectric film sensor.The piezoelectricity is thin
Film sensors 310 include piezoelectric membrane 311 and the top electrode 312 for being located at 311 two sides of piezoelectric membrane and lower electrode 313.
Flexible circuit board 32 includes two layers of double-sided metal cladding plate and the viscose glue for bonding two layers of double-sided metal cladding plate.Tool
Body, flexible circuit board 32 from top to bottom successively includes the first base 321, first line layer 322, the first encapsulated layer 323, second
Line layer 324, adhesive layer 325, tertiary circuit layer 326, the second encapsulated layer 327, the 4th line layer 328 and the second base 329.Its
In the first base 321, the first encapsulated layer 323, the second encapsulated layer 327 and the second base 329 material can for polyimides or
Polyester PET.First line layer 322, the second line layer 324, tertiary circuit layer 326, the 4th line layer 328 can be layers of copper.
Wherein, the first encapsulated layer 323, the second encapsulated layer 327, corresponding channel is set on adhesive layer 325 so that First Line
Part line conduction on road floor 322, the 4th line layer 328 and the second line layer 324, and grounding.
The corresponding position setting hole 320 of adhesive layer 325 and the second line layer 324 and tertiary circuit layer of exposed portion
326.Piezoelectric film sensor 310 is arranged in the hole 320, and the top electrode 312 of piezoelectric film sensor 310 passes through conduction
Glue 330 and the second line layer 324 are connected, and lower electrode 313 is connected by another conducting resinl 330 with tertiary circuit layer 326.
When piezoelectric film sensor 310 it is integrally disposed in the flexible circuit board 32 when, in flexible circuit board 32 first
Line layer 322 and the 4th line layer 328 act as the shielded layer of piezoelectric film sensor 310, due to the grounding of shielded layer,
External electrical field and magnetic field will not be made to influence the charge signal of piezoelectric film sensor 310.
Operational amplifier 33 (including charge level-one and voltage second amplifying circuit, not shown) and single-chip microcontroller can integrate and set
It sets on flexible circuit board 32, may also set up on the mainboard of touch control display apparatus.In embodiment illustrated in fig. 5, operational amplifier
33 are integrally disposed on flexible circuit board 32, and close to the interface end of flexible circuit board 32.Single-chip microcontroller setting is shown in touch-control to be filled
On the mainboard set.
When 311 stress of piezoelectric membrane of piezoelectric film sensor 310, upper and lower surface can generate charge inducing, pass through
Upper/lower electrode 312,313 carries out charge signal transmission, and passes through the second route in conducting resinl 330 and flexible circuit board 32
Charge signal is transmitted to operational amplifier 33 by layer 324 and tertiary circuit layer 326.The signal transmission amplified through operational amplifier 33
Carrying out analog-to-digital conversion to single-chip microcontroller becomes digital signal, establishes the corresponding relationship of touch pressure and signal.
When user's finger or other conductors carry out touch operation to touch display unit, due to user and display is touched
Coupled capacitor is generated between the capacitive touch control unit 20 of device, the capacitor of capacitive touch control unit 20 can change, according to capacitor
The basic principle of touch-control can detecte, obtain the accurate location information of touch point.Simultaneously as the protection of touch display unit
Also stress, the power are transmitted to pressure touch unit 30 to cover board 10, and pressure touch unit 30 can detecte each pressure sensor
The component information of 31 present positions, different according to the type of the pressure sensor 31 of selection, which can be voltage change letter
Breath, capacitance variation information, resistance variations information etc..According to each pressure sensor 31 pressure information obtained, may be implemented
Specific function.It, can according to the location of the size of four signals and pressure sensor 31 for example, in one embodiment
Accurately to obtain the location information of touch point.When capacitive touch control unit 20 and pressure touch unit 30 all obtain relevant information,
It is subject to the detection of capacitive touch control unit 20.When signal is not detected in capacitive touch control unit 20, and pressure touch unit 30 detects
When signal, the touch information of pressure touch unit 30 of being subject to acquisition.That is touch control display apparatus preferential answering capacitive touch control unit
20 detection signal.It should be pointed out that judging that the position of touch point is only the pressure using the pressure information of acquisition
A kind of application of touch control unit 30 can also realize other function using the pressure information of acquisition in other embodiments, than
Operation as in some applications can directly set the feedback to pressure size.
Under normal conditions, encapsulated layer, shielded layer and base will be also arranged again in piezoelectric film sensor 310 on the outside of upper/lower electrode
Layer.Since line layer (such as the 4th line layer 328 of first line layer 322 in Fig. 6) conduct can be used in flexible circuit board 32
Shielded layer, when piezoelectric film sensor 310 is integrated with flexible circuit board 32, the shielded layer in piezoelectric film sensor 310 is then
It can be substituted by the shielded layer of flexible circuit board 32.
Fig. 6 A is the further structure simplified embodiment of embodiment described in Fig. 6, i.e. piezoelectric membrane 311 in cancellation Fig. 6
Top electrode 312 and lower electrode 313, but piezoelectric membrane 311 is directly affixed into upper two-sided conducting resinl 330 two-sided conducting resinl under
Between 330.As shown in Figure 6A, upper and lower conducting resinl 330 is further simplified pressure directly as the upper/lower electrode of piezoelectric membrane 311
Touch control unit.
Illustrate the production method of above-mentioned pressure touch unit 30 in conjunction with Fig. 7 to Figure 11 below.
As shown in fig. 7, piezoelectric film sensor 310 includes piezoelectric membrane 311, is located at 311 two sides of piezoelectric membrane
Top electrode 312 and lower electrode 313, and be located at top electrode 312 and the outside of lower electrode 313 upper release film 314 and under from
Type film 315.
The material of piezoelectric membrane 311 includes inorganic piezoelectric thin-film material, organic piezoelectric film material, and wherein inorganic piezoelectric is thin
Membrane material can be zinc-oxide film, Al-Doped ZnO film, PLZT ceramics (PLZT) piezoelectric membrane and other piezoelectricity
Ceramic material, organic piezoelectric film can be thin for polyvinylidene fluoride (PVDF), porous polypropylene piezoelectric membrane, polylactic acid piezoelectricity
Other polyesters piezoelectric membranes such as film.Wherein piezoelectric membrane is very thin, with a thickness of 0.05-2 μm.
The specific preparation step of the piezoelectric film sensor 310 is：One piezoelectric membrane is provided；Pass through vaporation-type plated film, magnetic
The both side surface that the coating process such as sputtering type plated film, spraying are controlled in piezoelectric membrane plates top electrode；With die-cutting mould or other means
Obtain round, rectangular or other fixed shapes, with upper/lower electrode piezoelectric film-type elements；Upper/lower electrode surface be covered with from
Type film.It is thusly-formed piezoelectric film sensor 310 shown in fig. 7.It, can be first in upper/lower electrode table in above-mentioned preparation step
Face is covered with release film, then the step of being die cut.
As shown in figure 8, flexible circuit board 32 from top to bottom successively includes the first base 321, first line layer 322, first
Encapsulated layer 323, the second line layer 324, adhesive layer 325, tertiary circuit layer 326, the second encapsulated layer 327,328 and of the 4th line layer
Second base 329.It is wherein used to be arranged at the position of piezoelectric film sensor 310 namely the corresponding position of adhesive layer 325 is arranged
Hole 320 and the second line layer 324 and tertiary circuit layer 326 of exposed portion.Piezoelectric film sensor 310 is not disposed on flexibility
Conducting resinl 330 and the conducting of the second line layer 324 and another conducting resinl 330 are set before on circuit board 32, at the hole 320
It is connected with tertiary circuit layer 326.Release film 331 is set between two conducting resinls 330.
Wherein, corresponding channel is set on the first encapsulated layer 323, the second encapsulated layer 327 and adhesive layer 325, so that first
Part line conduction on line layer 322, the 4th line layer 328 and the second line layer 324, and it is being applied to touch control display apparatus
In after grounding.
It as shown in Figure 9 and Figure 10, is the sectional view and front elevation of the interface end of flexible circuit board 32.It is soft at interface end
Property circuit board 32 on each piezoelectric film sensor 310 of connection top electrode 312 the second line layer 324 by leading to accordingly
Road is guided to on 326 same plane of tertiary circuit layer, forms multiple signal feelers 333, because integrating on the flexible circuit board 32
Four piezoelectric film sensors 310 are set, therefore there are four signal feelers 333 for tool.In addition, first line layer 322, the 4th route
Layer 328 and the second part line conduction on line layer 324 simultaneously extend to form ground connection feeler 334, are used for grounding.Ground connection touching
Angle 334 and signal feeler 333 are in same plane, so as to be attached with external connector.
In some embodiments, the interface end of flexible circuit board 32 also forms a stiffening plate in the outside of the second base 329
332.Stiffening plate 332 is used to reinforce the physical strength at interface end, convenient to be attached with external connector.Stiffening plate 332
It can be formed by the materials such as polyimides (PI) or polyethylene terephthalate (PET).
With reference to Figure 11, the detailed preparation step of the flexible circuit board 32 of an embodiment is as follows：Blanking, preparation substrate, and
It drills on substrate, then carries out heavy copper and copper facing, paste dry film, layers of copper exposure development is etched, stripping preparation contains electrode figure
Second line layer of case；The tertiary circuit layer containing electrode pattern is prepared on another substrate with abovementioned steps；To the second route
Layer and tertiary circuit layer carry out laminate protection；Using viscose glue by two substrates (corresponding to two encapsulated layers) residual adhesion,
Wherein the second route layer and the electrode pattern of third route layer are that the parallel face of right opposite is placed；Two substrates of adhesion are carried out
Drill out the through-hole of ground connection, and carry out whole face sink copper facing, that is, form first line layer and the 4th line layer, at this time first line layer,
The part route of 4th line layer and the second line layer has been turned on；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 base and the second base；It re-forms on the outside of the second base by PI
Or the stiffening plate that PET is constituted；Finally it is punched, and at the position for placing piezoelectric film sensor (namely two substrates are not
The part of adhesion) the upper and lower two-sided conducting resinl with release film is sticked, obtain the flexible circuit board of structure as shown in Figure 8.It is obtained
The step of flexible circuit board is packed again.
Piezoelectric film sensor 310 and the integrated step of flexible circuit board 32 are：It will be in flexible circuit board 32 shown in Fig. 8
The related release film 331 of release film 331 on structure (including conducting resinl 330, the second line layer 324, the first encapsulated layer 323,
One line layer 322 and the first base 321) a part is torn up, by the lower release film in piezoelectric film sensor 310 shown in Fig. 7
315 tear off, and keep the conducting resinl 330 for being located at 331 lower section of release film in the piezoelectric membrane 311 exposed and flexible circuit board 32 viscous
It closes；Then the release film 331 in the upper release film 314 and flexible circuit board 32 in piezoelectric film sensor 310 is torn off respectively, it will
Another conducting resinl 330 in piezoelectric membrane 311 and flexible circuit board 32 bonds.
First line layer when piezoelectric film sensor 310 is integrated in flexible circuit board 32, in flexible circuit board 32
322 and the 4th line layer 328 act as shielded layer, due to the grounding of shielded layer, external electrical field will not be made to influence piezoelectricity thin
The charge signal of film sensors 310.
The mode that pressure sensor and flexible circuit board are integrated is able to solve multiple using winding displacement when multiple pressure sensors
Miscellaneous, the problems such as installation is inconvenient, but also can apply to the detection of the power of curved surface or multi-surface object.Two-sided conducting resinl is used simultaneously
In a manner of gluing, the integrated of piezoelectric sensor and flexible circuit board quickly and conveniently can be realized at a lower temperature.
In some embodiments, the piezoelectric film sensor in pressure touch unit provided by the invention, piezoelectric membrane
The upper/lower electrode of two sides can also use two-sided conducting resinl material, and two-sided conducting resinl material, which removes, is used as piezoelectric membrane and flexible circuit
Outside the connecting material of plate, also as the electrode material of piezoelectric membrane.
Although can generate charge inducing on its surface after piezoelectric membrane stress, the surface of piezoelectric membrane is non-conductive, because
This needs conductive material to transfer out the charge inducing signal on its surface.Two-sided conducting resinl is removed piezoelectric membrane and flexible electrical
Outside the plate adhesion of road, also the charge inducing signal that piezoelectric membrane surface generates is passed by the line layer in flexible circuit board
It is defeated.The area of two-sided conducting resinl and the surface area of piezoelectric membrane are identical, or are slightly less than surface area (the i.e. two-sided conduction of piezoelectric membrane
There is certain inside contract in glue).
On the other hand, touch control display apparatus provided by the invention, pressure touch unit fit on conductive substrate, benefit
With the electric conductivity and ground connection attribute of substrate, the shielding being arranged in piezoelectric film sensor in order to resist electromagnetic shielding can be reduced or remitted
Thus layer reduces the thickness of pressure touch unit, and then reduces the integral thickness of touch control display apparatus.Such as the pressure touch list
Member can be fitted on the casing center of mobile phone, tablet computer by two-sided conducting resinl, or with metal-back or surface band
Have on the display unit of conductive layer, using conductive layer as the electro-magnetic screen layer of piezoelectric film sensor.
The pressure touch unit can detecte by the multiple piezoelectric film sensors being arranged is applied to piezoelectric membrane sensing
The size information of the power of device present position.Meanwhile the pressure touch unit can be by two or more pressures by flexible circuit board
The effect of conductive film sensor makees integrated approach, makes it have while detecting the size information of multiple power, while simplification is multiple
The winding displacement complexity of piezoelectric film sensor and the lengthy and tedious degree of assembling.
In one embodiment, the flexible circuit board in pressure touch unit can be two layers of line layer structure, wherein a layer line
Road floor is as electro-magnetic screen layer, signals layer of another sandwich circuit layer as piezoelectric film sensor.It as shown in figure 12, is a kind of incite somebody to action
Piezoelectric film sensor 510 is integrated into the cross section structure signal of the pressure touch unit 50 on flexible circuit board 52.
The flexible circuit board 52 from top to bottom successively includes the first base 521, first line layer 522, adhesive layer 523, the
Two line layers 524 and the second base 525.First base 521, the second base 525 can be the materials such as polyimides or polyester PET
It is made, first line layer 522 and the second line layer 524 can be constituted for layers of copper or other metal/alloy materials.Adhesive layer 523
Corresponding position setting hole 520 and exposed portion first line layer 522 and the second line layer 524.The hole 520 is for holding
Set piezoelectric film sensor 510.
Piezoelectric film sensor 510 includes piezoelectric membrane 511 and the upper conducting resinl for being located at 511 two sides of piezoelectric membrane
512 and lower conducting resinl 513.Upper conducting resinl 512 is bonded with first line layer 522, and lower conducting resinl 513 and the second line layer 524 are viscous
Close, two electrodes of upper conducting resinl 512 and lower conducting resinl 513 as piezoelectric film sensor 510, while also as with flexible electrical
The connector of road plate 52, and the charge inducing signal that piezoelectric film sensor 510 generates is transmitted to the line of flexible circuit board 52
In the floor of road.In the structure shown in Figure 12, first line layer 522 can be used as electro-magnetic screen layer, be entire conductive layer, and
Through-hole is set at the suitable position of adhesive layer 523, makes the part connection in first line layer 522 and the second line layer 524.
Figure 13 and Figure 14 respectively illustrates section and front view of the flexible circuit board 52 at interface end.First line
After part connection in layer 522 and the second line layer 524, ground connection feeler 534 is drawn in the interface end of flexible circuit board 52.
In addition, the charge of multiple piezoelectric film sensors 510 is believed when flexible circuit board 52 integrates multiple piezoelectric film sensors 510
Number transmission occur draw a signal feeler 533 respectively in the second line layer 524, and in the interface end of flexible circuit board 52.
Four signal feelers 533 are shown in Figure 14, and four piezoelectric film sensors 510 are integrated on the flexible circuit board 52.One
In a little embodiments, the interface end of flexible circuit board 52 also forms a stiffening plate 532 in the outside of the second base 525.Stiffening plate 532
It is convenient to be attached with external connector for reinforcing the physical strength at interface end.Stiffening plate 532 can be by polyimides
(PI) or the materials such as polyethylene terephthalate (PET) are formed.
Figure 15 is that the pressure touch unit 50 is applied to the structural representation in a touch control display apparatus.The pressure touch unit
50 side (such as lower surface in Figure 15) fits in touch-control display dress by viscose glue such as optical cement OCA, glue etc.
90 surface of casing set, the casing 90 of conductive grounding play the role of electromagnetic shielding；Meanwhile the pressure touch unit
50 another side (such as upper surface in Figure 15) fits in the side of capacitive touch control unit 20, and capacitive touch control unit 20 can
To be the various capacitance touching control solutions including in-cell and on-cell structure.Certainly in some embodiments, should
Another side of pressure touch unit 50 can also fit in the side of cover sheet, or fit in the one of display module
Side.
In other embodiments, the flexible circuit board in pressure touch unit can only have a sandwich circuit layer, and
The first base and the second base are respectively formed in line layer two sides.It is used for transmission since the line layer of the flexible circuit board is only used as
The signal transmitting layer for the charge signal that piezoelectric film sensor generates, therefore the pressure touch unit application is in being fitted in its two sides
In conductive and grounding touch control display apparatus, electromagnetic shielding action is realized using the conductive structure of touch control display apparatus.
This kind of scheme eliminates the electro-magnetic screen layer in piezoelectric film sensor, therefore has lesser thickness.
Specific as shown in Figure 16, the flexible circuit board 62 in pressure touch unit 60 from top to bottom successively includes the first base
Layer 621, first line layer 622 and the second base 623.First base 621, the second base 623 can be polyimides or polyester
The materials such as PET are made, and first line layer 622 can be constituted for layers of copper or other metal/alloy materials.The phase of second base 623
Answer the first line layer 622 of position setting hole 620 and exposed portion.The hole 620 is for accommodating piezoelectric film sensor
610。
Piezoelectric film sensor 610 includes piezoelectric membrane 611 and the upper conducting resinl for being located at 611 two sides of piezoelectric membrane
612 and lower conducting resinl 613.Upper conducting resinl 612 is bonded with first line layer 622.Lower conducting resinl 613 is used for and touch control display apparatus
In corresponding construction bonding.Two electrodes of upper conducting resinl 612 and lower conducting resinl 613 as piezoelectric film sensor 610.
Figure 17 and Figure 18 respectively illustrates section and front view of the flexible circuit board 62 at interface end.First line
Layer 622 draws signal feeler 633 in the interface end of flexible circuit board 62.Since the first line layer 622 is only transmitted as signal,
Electromagnetic shielding action is not played, therefore draws ground connection feeler without corresponding route.When to integrate multiple piezoelectricity thin for flexible circuit board 56
When film sensors 610, the charge signal transmission of multiple piezoelectric film sensors 610 occurs in first line layer 622.Figure 18
In show five signal feelers 633, five piezoelectric film sensors 610 are integrated on the flexible circuit board 62.In some realities
It applies in example, the interface end of flexible circuit board 62 also forms a stiffening plate 632 in the outside of the second base 623.Stiffening plate 632 is used for
Reinforce the physical strength at interface end, it is convenient to be attached with external connector.Stiffening plate 632 can by polyimides (PI) or
The materials such as polyethylene terephthalate (PET) are formed.
Figure 19 is that the pressure touch unit 60 is applied to the structural representation in a touch control display apparatus.The pressure touch unit
60 side (such as lower surface in Figure 19) fits in 90 surface of casing of touch control display apparatus, the machine of conductive grounding
Shell 90 plays the role of electromagnetic shielding；Meanwhile another side (such as upper table in Figure 19 of the pressure touch unit 60
Face) side of the display unit 40 with metal frame is fitted in such as optical cement OCA, glue using viscose glue 41.Utilize casing 90
And the ground connection attribute of display unit 40 realizes shielding periphery electromagnetic environment to piezoelectric film sensor 610 and flexible circuit board
The interference of the charge signal in first line layer 622 in 62.Further, the second base of casing 90 and flexible circuit board 62
Settable adhesive layer 91 is, for example, that foam rubber, double-sided adhesive etc. are fixed between flexible circuit board 62 and casing 90 between 623.
It is to be appreciated that the display module of above-mentioned display unit 40 or nonmetallic frame, but one is plated on its surface
Layer conductive layer and grounding.It is to be appreciated that in other embodiments, another side of the pressure touch unit 60 can be with
It is bonded with capacitive touch control unit, capacitive touch control unit can be various types of capacitance touching control solutions, can also be capacitor
The capacitance touching control display module of touch-control and display module integration.
As shown in figure 20, another embodiment of the present invention provides the piezoelectric film sensor that is included of pressure touch unit 70
710 include piezoelectric membrane 711, the top electrode 712 for being located at 711 two sides of piezoelectric membrane and lower electrode 713.712 He of top electrode
Lower electrode 713 is conducting resinl.The two-sided conducting resinl of 711 two sides of piezoelectric membrane not only plays piezoelectric membrane upper/lower electrode,
Also play the role of adhesion when being assembled with flexible circuit board 72 and with other substrates.Top electrode 712, lower electrode 713
Surface area is identical as the surface area of piezoelectric membrane 711, or is slightly less than the surface area of piezoelectric membrane 711.
Another embodiment of the present invention provides the flexible circuit board 72 that is included of pressure touch unit 70, from top to bottom successively
Including the first base 721, first line layer 722, the first encapsulated layer 723, the second line layer 724 and the second base 725.Encapsulated layer
It can be made of materials such as polyimides or polyester PETs with base.First line layer 722, the second line layer 724 can be layers of copper
Or the conductive layer of other metal or alloy.First line layer 722 is entire conductive layer, by the first encapsulated layer 723
Channel is arranged in corresponding position, makes the part line conduction in first line layer 722 and the second line layer 724, and grounding, with
Play the role of electromagnetic shielding.Second line layer 724 is the signal transmitting layer of flexible circuit board 72, piezoelectric film sensor 710
The electric signal of generation is transferred to the interface end of flexible circuit board 72 by the second line layer 724.Providing holes in second base 725
Hole 720 is for accommodating piezoelectric film sensor 710.Second line layer 724 of 720 exposed portion of hole is for piezoelectric membrane biography
The top electrode 712 of sensor 710 connects.
It as shown in figure 21 and figure, is the sectional view and front elevation of the interface end of flexible circuit board 72.It is soft at interface end
Property circuit board 72 on the second line layer 724 of top electrode 712 of each piezoelectric film sensor 710 of connection draw multiple signals
Feeler 733.In addition, first line layer 722 and part line conduction in the second line layer 724 and drawing ground connection feeler 734 and using
In grounding.Ground connection feeler 734 and signal feeler 733 are generally aligned in the same plane, so as to be connected with external connector
It connects.
The charge inducing that piezoelectric film sensor 710 generates is transferred to the in flexible circuit board 72 by top electrode 712
Two line layers 724；Lower electrode 713 is directly connected with the substrate of touch control display apparatus, to keep piezoelectric film sensor 710 real
Electromagnetic interference is now resisted, lower electrode 713 should be connected with conductive ground connection substrate to be grounded effect, therefore lower electrode 713 can
With bonded metal or the casing of alloy material, perhaps bonding has the display unit of metal frame or is coated with the conductive layers such as metal
And the display unit of grounding.
In above-mentioned pressure touch unit 70, by the first line layer 722 and piezoelectric membrane sensing in flexible circuit board 72
The pressure touch unit is being effectively reduced in ground shield of the lower electrode 713 as piezoelectric film sensor 710 in device 710
70 by electromagnetic interference while, reduce the thickness of pressure touch unit 70.
The integrated of piezoelectric film sensor 710 and flexible circuit board 72 in the present invention can be by multiple piezoelectric film sensors
710 are assembled into simultaneously in a flexible circuit board 72, and the charge signal that each piezoelectric film sensor 710 generates passes through the second line
Road floor 724 is transferred to the interface end of flexible circuit board 72.First line layer 722 is by being arranged channel on the first encapsulated layer 723
Mode guide into the part route of the second line layer 724 of flexible circuit board 72, thus finally connect each piezoelectric membrane and pass
The signal feeler 733 of the top electrode 712 of sensor 710 and ground connection feeler 734 for ground connection are located at same flat at interface end
Face is connect to realize with other connector progress ZIF plug-in type or BTB press-button type.
In some embodiments, the interface end of flexible circuit board 32 also forms a stiffening plate in the outside of the first base 721
732.Stiffening plate 732 is used to reinforce the physical strength at interface end, convenient to be attached with external connector.Stiffening plate 732
It can be formed by the materials such as polyimides (PI) or polyethylene terephthalate (PET).
Illustrate integrated step of the above-mentioned pressure touch unit 70 in touch control display apparatus below in conjunction with Figure 23.Figure 23 is shown
Piezoelectric film sensor 710 in pressure touch unit 70 is by lower electrode 713 and the conductive base in touch control display apparatus
Bonding.The conductive base can be conductive casing 90, be also possible to the display unit 40 with metal frame, or be coated with conduction
The display unit 40 of layer.Wherein the second substrate 725 of flexible circuit board 72 is, for example, foam rubber, double-sided adhesive etc. by adhesive layer 91
It is adhesively fixed with casing 90 or display unit 40.
The integrated approach of piezoelectric film sensor 710 and flexible circuit board 72 that above-mentioned pressure touch unit 70 is included can
Including following process：
One, the preparation of flexible circuit board, according to the technique preparation above addressed containing there are two the flexible circuits of line layer
Plate.Wherein first line layer and the second line layer are by the channel that is arranged in encapsulated layer, so that first line layer and the second line
Part line conduction in the floor of road, and ground connection feeler is drawn for being grounded at the interface end of flexible circuit board.Second line layer
Then the quantity of integrated piezoelectric thin film sensor and position carry out cabling design according to schedule.The wherein suitable position of the second base
Hole is set, with the second line layer of exposed portion, for installing piezoelectric film sensor at the hole.
Two, two-sided conducting resinl is fitted in two sides of piezoelectric membrane respectively；
Three, the piezoelectric membrane for being fitted with upper and lower conducting resinl is fitted at the hole of flexible circuit board, and makes therein one
A conducting resinl is adhesively fixed with the second line layer exposed；Wherein above-mentioned step two and step 3 specific order can be adjusted flexibly
It is whole, such as conducting resinl can first fit at the hole of flexible circuit board and the second line layer bonds, then piezoelectric membrane is pasted
In on the conducting resinl；
Four, foam rubber is sticked in the second base lower surface of flexible circuit board, wherein the piezoelectric membrane on flexible circuit board
Sensor is exposed outside, is not covered by foam rubber；Then the pressure touch unit is fitted to conductive casing or rear cover again
On the display unit of surface earthing processing, when the thickness of foam rubber is slightly larger than the thickness of the piezoelectric film sensor containing two layers of conducting resinl
When spending, one bulge-structure can be set in the position that casing is docked with piezoelectric film sensor；It simultaneously can also be by increasing piezoelectricity
The thickness of thin film sensor and the thickness for reducing foam rubber, make piezoelectric film sensor plus two layers of two-sided conducting resinl thickness with
The thickness of foam rubber is close, then casing or display unit do not need that bulge-structure is still further arranged, can be with the pressure touch list
Member is bonded.
Figure 24 and Figure 25 shows concrete application of the above-mentioned pressure touch unit in a touch control display apparatus.The touch-control is aobvious
Showing device includes casing 90 and cover sheet 10, and capacitive touch control unit 20, display unit 40 and the setting of pressure touch unit 70 exist
In the accommodating cavity that casing and cover sheet 10 are formed.Pressure touch unit 70 may be provided between display unit 40 and casing 90.
Wherein, capacitive touch control unit 20 can be external hanging type touch scheme, can also be in-cell or on-cell organization plan, namely
Capacitive touch control unit 20 and display unit 40 are integrally disposed.In some embodiments, casing 90 corresponding pressure touch control unit 70
The position of piezoelectric film sensor 710 is provided with protrusion 92, to avoid in pressure touch unit 70 because using the structures such as adhesive layer
The different problem of bring height influences assembly precision.The display effect of 92 pairs of display units 40 of protrusion when pressing screen to reduce
The influence of fruit, display unit 40 is preferably using the display module for having metal frame.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies 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, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (9)
1. a kind of pressure touch unit, it is characterised in that including flexible circuit board, the control core being electrically connected with flexible circuit board
Piece and the piezoelectric film sensor being arranged on flexible circuit board, wherein：
The flexible circuit board includes the first base set gradually, first line layer, the first encapsulated layer, the second line layer, glue
Adhesion coating, tertiary circuit layer, the second encapsulated layer, the 4th line layer and the second base, setting hole and exposed division on the adhesive layer
The second line layer and tertiary circuit layer divided；
The piezoelectric film sensor include piezoelectric membrane and be located at piezoelectric membrane two sides top electrode and lower electrode, it is described
Piezoelectric film sensor is arranged at the described hole of flexible circuit board, and the top electrode is connected with the second line layer, described
Lower electrode is connected with tertiary circuit layer.
2. pressure touch unit according to claim 1, which is characterized in that the top electrode is with the second line layer by leading
Electric glue conducting, the lower electrode are connected with tertiary circuit layer by another conducting resinl.
3. pressure touch unit according to claim 1, which is characterized in that first encapsulated layer, the second encapsulated layer, glue
Corresponding channel is set on adhesion coating, so that the part line conduction on first line layer, the 4th line layer and the second line layer, and
For grounding, make first line layer and the 4th line layer as electro-magnetic screen layer.
4. pressure touch unit according to claim 1, which is characterized in that the interface end of the flexible circuit board is second
The outside of base also forms a stiffening plate.
5. a kind of touch control display apparatus, including pressure touch unit described in any one of claim 1-4.
6. a kind of production method of pressure touch unit, includes the following steps：
There is provided piezoelectric film sensor, including piezoelectric membrane, be located at piezoelectric membrane two sides top electrode and lower electrode, and
The upper release film and lower release film being located on the outside of top electrode and lower electrode；
There is provided flexible circuit board, including set gradually the first base, first line layer, the first encapsulated layer, the second line layer, glue
Adhesion coating, tertiary circuit layer, the second encapsulated layer, the 4th line layer and the second base, wherein hole is arranged in the corresponding position of adhesive layer
And the second line layer and tertiary circuit layer of exposed portion, setting conducting resinl is connected with the second line layer at the hole, Yi Jiling
One conducting resinl is connected with tertiary circuit layer, and release film is arranged between two conducting resinls；
By in piezoelectric film sensor upper release film and the removal of lower release film, and remove the release film in flexible circuit board, make
Piezoelectric film sensor is arranged in hole, and top electrode and conductive adhesive, lower electrode and another conductive adhesive.
7. production method according to claim 6, which is characterized in that the preparation step of the piezoelectric film sensor includes：
One piezoelectric membrane is provided；Top electrode and lower electrode are made respectively in the both side surface of piezoelectric membrane；Cross cutting is with upper/lower electrode
Piezoelectric membrane；And upper release film, release film under being formed in lower electrode surface are formed in upper electrode surface.
8. production method according to claim 6, which is characterized in that the making step of the flexible circuit board includes：Prepare
Substrate, and drill on substrate, then prepare the second line layer containing electrode pattern；Preparation contains electrode on another substrate
The tertiary circuit layer of pattern；Laminate protection is carried out to the second line layer and tertiary circuit layer；Using gluing by two substrates
Residual adhesion, wherein the second route layer and the electrode pattern of third route layer are that the parallel face of right opposite is placed；To the two of adhesion
A substrate drill out the through-hole of ground connection, and forms first line layer and the 4th line layer, first line layer, the 4th line layer and
The part line conduction of second line layer；The first base and the second base are formed on the surface of first line layer and the 4th line layer
Layer；And punching, and the conducting resinl up and down with release film is sticked in the part of two non-adhesions of substrate.
9. production method according to claim 8, which is characterized in that the making step of the flexible circuit board further includes
The step of re-forming stiffening plate on the outside of two bases.
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| CN105183230B (en) * | 2015-09-18 | 2017-09-19 | 京东方科技集团股份有限公司 | A kind of display device, pressure detection method and pressure-detecting device |
| CN108139821A (en) * | 2015-10-29 | 2018-06-08 | 惠普发展公司，有限责任合伙企业 | Touch apparatus |
| TWI567613B (en) * | 2015-12-04 | 2017-01-21 | 恆顥科技股份有限公司 | Force sensing module and force touch sensing display module |
| CN105571634B (en) * | 2015-12-08 | 2018-05-29 | 成都信息工程大学 | The detection unit and detection method of pressure distortion tear based on security sensor |
| CN105426008B (en) * | 2015-12-09 | 2019-02-19 | 深圳市骏达光电股份有限公司 | Pressure sensitive touching display screen and portable electronic product |
| CN105468197A (en) * | 2015-12-09 | 2016-04-06 | 深圳市骏达光电股份有限公司 | In-cell touch display screen and portable electronic product |
| CN105426009B (en) * | 2015-12-09 | 2019-02-19 | 深圳市骏达光电股份有限公司 | OGS touching display screen and portable electronic product |
| CN105426007B (en) * | 2015-12-09 | 2019-02-19 | 深圳市骏达光电股份有限公司 | On-cell touching display screen and portable electronic product |
| CN105405958B (en) * | 2015-12-23 | 2018-05-08 | 昆山国显光电有限公司 | Piezoelectric membrane encapsulating structure and self power generation flexible display screen |
| CN106021472A (en) * | 2016-05-18 | 2016-10-12 | 上海交通大学 | One-dimensional position sensing apparatus-based book locating system and method |
| CN106020582B (en) * | 2016-05-28 | 2019-07-09 | 业成光电（深圳）有限公司 | Touch device |
| CN106468973B (en) * | 2016-08-31 | 2020-07-28 | 珠海市魅族科技有限公司 | Touch event processing method and device |
| CN106775055B (en) * | 2016-11-23 | 2022-05-10 | 安徽精卓光显技术有限责任公司 | Flexible touch screen and flexible touch display screen |
| CN106843571A (en) * | 2016-12-30 | 2017-06-13 | 南昌欧菲光科技有限公司 | Touch-control sensing component |
| CN106775107A (en) * | 2016-12-30 | 2017-05-31 | 南昌欧菲光科技有限公司 | Touch display screen |
| CN108803930B (en) * | 2018-06-07 | 2020-08-07 | 京东方科技集团股份有限公司 | Pressure sensing module, manufacturing method thereof and electronic equipment |
| DE102018127651A1 (en) * | 2018-11-06 | 2020-05-07 | iNDTact GmbH | Electromechanical converter with a layer structure |
| CN112525064A (en) * | 2020-11-16 | 2021-03-19 | 中航电测仪器股份有限公司 | Self-contained medium-temperature strain gauge for semi-cured adhesive layer and use method thereof |
| CN114840100A (en) * | 2022-03-31 | 2022-08-02 | 电子科技大学 | OLED touch display module integrated with pressure sensor |
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