CN204695287U - Touch control display apparatus and pressure touch unit - Google Patents
Touch control display apparatus and pressure touch unit Download PDFInfo
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- CN204695287U CN204695287U CN201520372331.8U CN201520372331U CN204695287U CN 204695287 U CN204695287 U CN 204695287U CN 201520372331 U CN201520372331 U CN 201520372331U CN 204695287 U CN204695287 U CN 204695287U
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Abstract
The utility model relates to a kind of pressure touch unit and adopts the touch control display apparatus of this pressure touch unit, this pressure touch unit comprises flexible PCB, be arranged on the some pressure transducers on flexible PCB and control chip, flexible PCB is provided with transmission line, the corresponding electrical resistance of described pressure transducer connects these transmission lines, described pressure touch unit produces electric signal respectively and inputs described control chip by the transmission line of described flexible PCB time stressed in described touch control display apparatus reception touch operation, described control chip obtains point force information of these touch sensing positions according to these electric signal, thus according to the positional information of these component information acquisition contactor control device stress points.Be arranged on flexible PCB by integrated for pressure transducer, the winding displacement design of pressure transducer can be simplified, be beneficial to the assembling of pressure touch unit in touch control display apparatus simultaneously.
Description
Technical field
The utility model belongs to touch-control display field, relates to a kind of touch control display apparatus, particularly relates to a kind of touch control display apparatus with pressure sensing effect.
Background technology
At present, there is the electronic products such as the mobile phone of touch controllable function, panel computer, TV and adopt capacitance touching control scheme more and more.But capacitance type touch control screen also exists many defects, such as, when the palm of larger area or conductor to cause the erroneous judgement of capacitance type touch control screen near capacitance type touch control screen instead of when touching; In a humid environment or capacitance touching control screen surfaces there is water droplet, spot time, also can cause the maloperation of capacitance type touch control screen or operate insensitive; In addition, the hand of band gloves can not be adopted or hold nonconducting object and carry out normal running capacitance type touch control screen.
The maloperation problem of capacitance type touch control screen can be caused for capacitance type touch control screen surface moisture or when depositing spot, not yet occur that gratifying scheme can be solved at present.Part manufacturer is had to improve touch control operation effect when being with gloves by modes such as the sensitivity of raising capacitance type touch control screen, but this scheme can make the capacitance type touch control screen when not being with gloves to operate too sensitive and produce maloperation, and this scheme can not solve the touch control operation of nonconducting object in addition.Also have part manufacturer by being combined the touch scheme of pressure transducer, but there is assembly difficulty, high in cost of production defect.
Utility model content
Based on this, be necessary for the problems referred to above, a kind of pressure touch unit be provided and adopt the touch control display apparatus of this pressure touch unit.
A kind of pressure touch unit, be applied to touch control display apparatus with recognizing site information, comprise flexible PCB, be arranged on the some pressure transducers on flexible PCB and control chip, flexible PCB is provided with transmission line, the corresponding electrical resistance of described pressure transducer connects these transmission lines, described pressure touch unit produces electric signal respectively and inputs described control chip by the transmission line of described flexible PCB time stressed in described touch control display apparatus reception touch operation, described control chip obtains point force information of these touch sensing positions according to these electric signal, thus according to the positional information of these component information acquisition contactor control device stress points.
Above-mentioned pressure touch unit is arranged on flexible PCB by integrated for pressure transducer, can simplify the winding displacement design of pressure transducer, be beneficial to the assembling of pressure touch unit in touch control display apparatus simultaneously.
Wherein in an embodiment, described control chip is arranged on described flexible PCB, and described control chip and pressure transducer are electrically connected by the transmission line of described flexible PCB.
Wherein in an embodiment, described pressure transducer is piezoelectric film sensor, resistance-type force snesor, capacitive force transducer or metal strain meter.
Wherein in an embodiment, described flexible PCB is multiple, and is connected by syndeton.
Wherein in an embodiment, described pressure transducer is arranged on the end points place of flexible PCB.
A kind of touch control display apparatus, comprise cover sheet, capacitive touch control unit, pressure touch unit and display unit, wherein pressure touch unit is any one pressure touch unit above-mentioned.
Wherein in an embodiment, described cover sheet, capacitive touch control unit, pressure touch unit and display unit set gradually.
Wherein in an embodiment, described cover sheet, capacitive touch control unit, display unit and pressure touch unit set gradually.
Wherein in an embodiment, described cover sheet, pressure touch unit, capacitive touch control unit and display unit set gradually.
Wherein in an embodiment, this cover sheet is roughly rectangle, and the quantity of described pressure transducer is 4, respectively near 4 jiaos of described cover sheet.
Accompanying drawing explanation
The structural representation of the touch control display apparatus that Fig. 1 provides for the utility model one embodiment;
The cross section structure schematic diagram that Fig. 2 is touch control display apparatus shown in Fig. 1;
The cross section structure schematic diagram of the touch control display apparatus that Fig. 3 with Fig. 4 provides for the different embodiment of the utility model;
The structural representation of the pressure touch unit that Fig. 5 provides for the utility model one embodiment;
Fig. 6 is the cross section structure schematic diagram of the unit of pressure touch shown in Fig. 5;
Fig. 6 A and Fig. 6 is similar, shows 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 the utility model one embodiment;
The structural representation of the flexible PCB for integrating piezoelectric film sensor that Fig. 8 provides for the utility model one embodiment;
The sectional view that Fig. 9 and Figure 10 is the interface end of flexible PCB shown in Fig. 8 and front view (FV);
The making that Figure 11 provides for the utility model one embodiment is for integrating the process flow diagram of the flexible PCB of piezoelectric film sensor;
The cross section structure schematic diagram of the pressure touch unit that Figure 12 provides for another embodiment of the utility model;
Figure 13 and Figure 14 is the sectional view of the flexible PCB in the unit of pressure touch shown in Figure 12 in interface end place and front view (FV);
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 utility model;
Figure 17 and Figure 18 is the sectional view of the flexible PCB in the unit of pressure touch shown in Figure 16 in interface end place and front view (FV);
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 utility model;
Figure 21 and Figure 22 is the sectional view of the flexible PCB in the unit of pressure touch shown in Figure 20 in interface end place and front view (FV);
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 structural representation of the different visual angles of the touch control display apparatus that Figure 24 and Figure 25 provides for another embodiment of the utility model.
Embodiment
As depicted in figs. 1 and 2, a kind of touch control display apparatus that the utility model one embodiment provides comprises cover sheet 10, capacitive touch control unit 20, pressure touch unit 30 and display unit 40.When user operates this touch control display apparatus, the positional information of touch point can be judged by capacitive touch control unit 20, or judged the positional information of touch point by pressure touch unit 30, finally realize touch operation function.
Cover sheet 10 can be tempered glass cover plate, plastic cover plate, polymethylmethacrylate (PMMA) cover plate etc.
Capacitive touch control unit 20 comprises capacitive transducer 21, the flexible PCB 22 be connected with capacitive transducer 21 and capacitance touching control chip (not shown).Capacitive transducer 21 comprises multiple drive electrode and induction electrode; these two kinds of touch control electrode (not shown) can be distributed in same base material (not shown); or being distributed in two different base materials respectively, these two kinds of touch control electrode can be formed in the medial surface of cover sheet 10 and make cover sheet 10 have the function of capacitive transducer concurrently.Also the surface of the insulating substrate fitting in cover sheet 10 can be formed in.Capacitive transducer 21 also comprises the leading electrode (scheming not show, such as silver slurry) conducted with touch control electrode, and touch control electrode is led to a place by leading electrode, and is bound by anisotropic conductive (ACF) and flexible PCB 22.Capacitance touching control chip can be arranged on the flexible PCB 22 of capacitive touch control unit 20, also can be arranged on the mainboard of touch control display apparatus, such as when this touch control display apparatus is mobile phone, the capacitance touching control chip of capacitive touch control unit 20 can be integrated and be arranged on the mainboard of mobile phone.
Capacitive touch control unit 20 can detect by capacity coupled mode the precise position information obtaining multiple touch point.
Pressure touch unit 30 comprises flexible PCB 32, is arranged on the pressure transducer 31 of more than three or three on flexible PCB 32, and control chip (not shown).Pressure transducer 31 can be the force snesor of the types such as piezoelectric film sensor, resistance-type force snesor, capacitive force transducer or metal strain meter.
In the present embodiment, pressure touch unit 30 is positioned at the side of capacitive touch control unit 20 away from cover sheet 10.In other words, in the present embodiment, the 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 also can be positioned at the side of display unit 40 away from capacitive touch control unit 20, and display unit 40 is positioned at the side of capacitive touch control unit 20 away from cover sheet 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 also directly can be in the side of cover sheet 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 transducer 31 is four, is separately positioned on four end points places of flexible PCB 32, and this pressure transducer 31 is distributed in four corners of touch control display apparatus.
The control chip of pressure touch unit 30 can be integrated and be arranged on the mainboard of this touch control display apparatus, or is arranged on flexible PCB 32, and reaches electric connection with flexible PCB 32.
Pressure transducer 31 combines and is arranged on flexible PCB 32 by the utility model, circuit on flexible PCB 32 is by pressure transducer 31 and external control chip electrically conducting, adopt the integrated level that can improve pressure touch unit 30 in this way, be convenient to follow-up assembling.
Below will select piezoelectric film sensor for pressure transducer 31, the concrete structure of this pressure touch unit 30 and setting will be described further.
As shown in Figure 5 and Figure 6, in an embodiment, pressure touch unit 30 comprises piezoelectric film sensor 310, flexible PCB 32, control chip.Control chip can comprise the components and parts such as operational amplifier 33, single-chip microcomputer (containing A/D converter, figure does not show).
According to the concrete setting position of pressure touch unit 30, fit by the casing (not shown) of double faced adhesive tape, glue or foam rubber and touch control display apparatus, cover sheet 10, capacitive touch control unit 20 or display unit 40.
For reducing the cost of pressure touch unit 30, improve the utilization factor of flexible PCB 32, the flexible PCB 32 of its integrated piezoelectric thin film sensor 310 can be as a whole, or as shown in Figure 5, comprise two or more flexible PCB 32, such as that zero insertion force (Zero Insertion Force, ZIF) connected structure or plate reach connection to plate (Board To Board, BTB) snap arrangement by syndeton 320 between multiple flexible PCB 32.
Be illustrated in figure 6 the schematic cross-section of flexible PCB 32 and piezoelectric film sensor 310 junction.This piezoelectric film sensor 310 comprises piezoelectric membrane 311 and lays respectively at top electrode 312 and the bottom electrode 313 of piezoelectric membrane 311 both sides.
Flexible PCB 32 comprises two-layer double-sided metal cladding plate and the viscose glue for bonding two-layer double-sided metal cladding plate.Particularly, flexible PCB 32 comprises the first basic unit 321, first line layer 322, first encapsulated layer 323, second line layer 324, adhesive layer 325, tertiary circuit layer 326, second encapsulated layer 327, the 4th line layer 328 and the second basic unit 329 from top to bottom successively.Wherein the material of the first basic unit 321, first encapsulated layer 323, second encapsulated layer 327 and the second basic unit 329 can be polyimide or polyester PET.First line layer 322, second line layer 324, tertiary circuit layer 326, the 4th line layer 328 can be layers of copper.
Wherein, the first encapsulated layer 323, second encapsulated layer 327, adhesive layer 325 arrange corresponding passage, make the part line conduction on first line layer 322, the 4th line layer 328 and the second line layer 324, and grounding.
The relevant position of adhesive layer 325 arranges hole 320 and the second line layer 324 of exposed portion and tertiary circuit layer 326.Piezoelectric film sensor 310 is arranged in this hole 320, and the top electrode 312 of piezoelectric film sensor 310 is by conducting resinl 330 and the second line layer 324 conducting, and bottom electrode 313 is by another conducting resinl 330 and tertiary circuit layer 326 conducting.
When piezoelectric film sensor 310 is integrated be arranged in this flexible PCB 32 time, first line layer 322 in flexible PCB 32 and the 4th line layer 328 act as the screen layer of piezoelectric film sensor 310, due to the grounding of screen layer, the charge signal of external electrical field and influence of magnetic field piezoelectric film sensor 310 can not be made.
Operational amplifier 33 (comprise electric charge one-level and voltage second amplifying circuit, figure does not show) and single-chip microcomputer can integratedly be arranged on flexible PCB 32, also can be arranged on the mainboard of touch control display apparatus.In embodiment illustrated in fig. 5, operational amplifier 33 is integrated to be arranged on flexible PCB 32, and the interface end of close flexible PCB 32.Single-chip microcomputer is arranged on the mainboard of touch control display apparatus.
When the piezoelectric membrane 311 of piezoelectric film sensor 310 is stressed, its upper and lower surface can produce induced charge, charge signal transmission is carried out by upper/lower electrode 312,313, and by conducting resinl 330, and charge signal is transferred to operational amplifier 33 by the second line layer 324 in flexible PCB 32 and tertiary circuit layer 326.Transfer to single-chip microcomputer through operational amplifier 33 amplifying signal to carry out analog to digital conversion and become digital signal, set up the corresponding relation of touch pressure and signal.
When user's finger or other conductor carry out touch operation to touch display unit, owing to producing coupling capacitance between user and the capacitive touch control unit 20 of touch display unit, the electric capacity of capacitive touch control unit 20 can change, according to the ultimate principle of capacitance touching control, can detect, obtain the accurate location information of touch point.Simultaneously; because the cover sheet 10 of touch display unit is also stressed; this power is transmitted to pressure touch unit 30; pressure touch unit 30 can detect point force information of each pressure transducer 31 present position; different according to the type of the pressure transducer 31 chosen, this information can be change in voltage information, capacitance variations information, resistance variations information etc.According to the pressure information that each pressure transducer 31 obtains, specific function can be realized.Such as, in one embodiment, the position residing for the size of four signals and pressure transducer 31 can the positional information of Obtaining Accurate touch point.When capacitive touch control unit 20 and pressure touch unit 30 all obtain relevant information, be as the criterion with the detection of capacitive touch control unit 20.When the non-detecting signal of capacitive touch control unit 20, and when pressure touch unit 30 detects signal, be as the criterion with the touch information that pressure touch unit 30 obtains.The i.e. detection signal of touch control display apparatus preferential answering capacitive touch control unit 20.It is to be noted, the position of touch point is only the one application of described pressure touch unit 30 to utilize the pressure information obtained to judge, in other embodiments, utilize the pressure information obtained can also realize other functions, such as operation in some applications directly can set the feedback to pressure size.
Under normal circumstances, piezoelectric film sensor 310 also will arrange encapsulated layer, screen layer and basic unit again outside upper/lower electrode.Due to line layer (first line layer 322 the 4th line layer 328 in such as Fig. 6) can be adopted in flexible PCB 32 as screen layer, when piezoelectric film sensor 310 and flexible PCB 32 are integrated, the screen layer in piezoelectric film sensor 310 then can be substituted by the screen layer of flexible PCB 32.
The further structure simplified embodiment that Fig. 6 A is embodiment described in Fig. 6, namely cancels top electrode 312 and the bottom electrode 313 of the piezoelectric membrane 311 in Fig. 6, but is directly affixed between upper two-sided conducting resinl 330 and lower two-sided conducting resinl 330 by piezoelectric membrane 311.As shown in Figure 6A, upper and lower conducting resinl 330, directly as the upper/lower electrode of piezoelectric membrane 311, simplifies pressure touch unit further.
Below composition graphs 7 to Figure 11 illustrates the method for making of above-mentioned pressure touch unit 30 again.
As shown in Figure 7, piezoelectric film sensor 310 comprises piezoelectric membrane 311, lays respectively at top electrode 312 and the bottom electrode 313 of piezoelectric membrane 311 both sides, and the upper release film 314 laid respectively at outside top electrode 312 and bottom electrode 313 and lower release film 315.
The material of piezoelectric membrane 311 comprises inorganic piezoelectric membraneous material, organic piezoelectric film material, wherein inorganic piezoelectric membraneous material can be zinc-oxide film, Al-Doped ZnO film, PLZT ceramics (PLZT) piezoelectric membrane and other piezoceramic material, and organic piezoelectric film can be other polyesters piezoelectric membranes such as polyvinylidene fluoride (PVDF), porous polypropylene piezoelectric membrane, PLA piezoelectric membrane.Wherein piezoelectric membrane is very thin, and thickness is 0.05-2 μm.
The concrete preparation process of this piezoelectric film sensor 310 is: provide a piezoelectric membrane; Electrode is plated in the both side surface of piezoelectric membrane by coating process such as vaporation-type plated film, magnetron sputtering formula plated film, sprayings; With die-cutting mould or alternate manner obtain circular, square or other solid shape, with the piezoelectric film-type element of upper/lower electrode; Release film is covered with on upper/lower electrode surface.Piezoelectric film sensor 310 shown in formation Fig. 7 like this.In above-mentioned preparation process, first can be covered with release film on upper/lower electrode surface, then carry out the step of cross cutting.
As shown in Figure 8, flexible PCB 32 comprises the first basic unit 321, first line layer 322, first encapsulated layer 323, second line layer 324, adhesive layer 325, tertiary circuit layer 326, second encapsulated layer 327, the 4th line layer 328 and the second basic unit 329 from top to bottom successively.Wherein for arranging the position of piezoelectric film sensor 310, also namely the relevant position of adhesive layer 325 arranges hole 320 and the second line layer 324 of exposed portion and tertiary circuit layer 326.Before piezoelectric film sensor 310 is not arranged on flexible PCB 32, this hole 320 place arranges conducting resinl 330 and the second line layer 324 conducting, and another conducting resinl 330 and tertiary circuit layer 326 conducting.Between two conducting resinls 330, release film 331 is set.
Wherein, first encapsulated layer 323, second encapsulated layer 327 and adhesive layer 325 arrange corresponding passage, make the part line conduction on first line layer 322, the 4th line layer 328 and the second line layer 324, and be applied to grounding after in touch control display apparatus.
As shown in Figure 9 and Figure 10, be sectional view and the front view (FV) of the interface end of flexible PCB 32.At interface end place, second line layer 324 of the top electrode 312 of each piezoelectric film sensor 310 of the connection on flexible PCB 32 guides to on tertiary circuit layer 326 same plane by corresponding passage, form multiple signal feeler 333, four piezoelectric film sensors 310 are set because of integrated on this flexible PCB 32, therefore there are four signal feelers 333.In addition, the part line conduction on first line layer 322, the 4th line layer 328 and the second line layer 324 also extends to form ground connection feeler 334, for grounding.Ground connection feeler 334 and signal feeler 333 are all in same plane, thus can be connected with the connector of outside.
In certain embodiments, the interface end of flexible PCB 32 also forms a stiffening plate 332 in the outside of the second basic unit 329.Stiffening plate 332, for strengthening the physical strength at interface end place, is conveniently connected with outside connector.Stiffening plate 332 can be formed by materials such as polyimide (PI) or polyethylene terephthalates (PET).
With reference to Figure 11, the detailed preparation process of the flexible PCB 32 of an embodiment is as follows: prepare base material, and hole on base material, then carry out heavy copper and copper facing, paste dry film, to the etching of layers of copper exposure imaging, and second line layer of stripping preparation containing electrode pattern; On another base material, the tertiary circuit layer containing electrode pattern is prepared with abovementioned steps; Laminate protection is carried out to the second line layer and tertiary circuit layer; Utilize viscose glue by two base materials (corresponding to two encapsulated layers) residual adhesion, wherein the second route layer and the electrode pattern of three-route layer are that right opposite is parallel just to placement; Two base materials of adhesion are got out to the through hole of ground connection, and carry out whole heavy copper facing, namely form first line layer and the 4th line layer, now the part circuit conducting of first line layer, the 4th line layer and the second line layer; PI material is covered or PET material carries out laminating operation, to form the first basic unit and the second basic unit on the surface of first line layer and the 4th line layer; The stiffening plate be made up of PI or PET is formed again in the outside of the second basic unit; Last stamping-out, and the upper and lower two-sided conducting resinl sticking band release film in the position (parts of also i.e. two non-adhesions of base material) for placing piezoelectric film sensor, obtain the flexible PCB of structure as shown in Figure 8.Obtained flexible PCB carries out the step of packing again.
The integrated step of piezoelectric film sensor 310 and flexible PCB 32 for: the structure (comprising conducting resinl 330, second line layer 324, first encapsulated layer 323, first line layer 322 and the first basic unit 321) on related for the release film 331 in the flexible PCB 32 shown in Fig. 8 release film 331 is torn up a part, lower release film 315 in piezoelectric film sensor 310 shown in Fig. 7 is torn off, and the piezoelectric membrane 311 exposed is bonded with the conducting resinl 330 be positioned at below release film 331 in flexible PCB 32; Then tear the upper release film 314 in piezoelectric film sensor 310 and the release film 331 in flexible PCB 32 respectively off, piezoelectric membrane 311 and another conducting resinl 330 in flexible PCB 32 are bonded.
When piezoelectric film sensor 310 is integrated in flexible PCB 32, first line layer 322 in flexible PCB 32 and the 4th line layer 328 act as screen layer, due to the grounding of screen layer, external electrical field can not be made to affect the charge signal of piezoelectric film sensor 310.
By pressure transducer and the integrated mode of flexible PCB, can solve winding displacement when using multiple pressure transducer complicated, the problems such as inconvenience are installed, and the detection of power of curved surface or multi-surface object can also be applied to.Adopt two-sided conducting resinl in gluing mode simultaneously, can at a lower temperature, realize the integrated of piezoelectric sensor and flexible PCB fast, easily.
In certain embodiments, piezoelectric film sensor in the pressure touch unit that the utility model provides, the upper/lower electrode of its piezoelectric membrane both sides can also adopt two-sided conducting resinl material, two-sided conducting resinl material except the connecting material as piezoelectric membrane and flexible PCB, also as the electrode material of piezoelectric membrane.
Although can produce induced charge on its surface after piezoelectric membrane is stressed, the surface of piezoelectric membrane is non-conductive, therefore needs the material conducted electricity to be gone out by the induced charge Signal transmissions on its surface.The induced charge signal that piezoelectric membrane surface produces, except by except piezoelectric membrane and flexible PCB adhesion, is also transmitted by the line layer in flexible PCB by two-sided conducting resinl.The area of two-sided conducting resinl is identical with the surface area of piezoelectric membrane, or is slightly less than the surface area (namely two-sided conducting resinl exists certain inside contracting) of piezoelectric membrane.
On the other hand, the touch control display apparatus that the utility model provides, its pressure touch unit fits on the base material of conduction, utilize electric conductivity and the ground connection attribute of base material, can reduce or remit in piezoelectric film sensor to resist the screen layer that electromagnetic screen is arranged, reduce the thickness of pressure touch unit thus, and then reduce the integral thickness of touch control display apparatus.Such as this pressure touch unit can be fitted on the casing center of mobile phone, panel computer by two-sided conducting resinl, or with betal can or surface with on the display unit of conductive layer, using the electro-magnetic screen layer of conductive layer as piezoelectric film sensor.
This pressure touch unit can detect the size information of the power being applied to piezoelectric film sensor present position by the multiple piezoelectric film sensors arranged.Simultaneously, two or more piezoelectric film sensor can be made integrated approach by flexible PCB by this pressure touch unit, make it have the effect of the size information simultaneously detecting multiple power, simplify the winding displacement complexity of multiple piezoelectric film sensor and the lengthy and tedious degree of assembling simultaneously.
In one embodiment, the flexible PCB in pressure touch unit can be two-layer line layer structure, and wherein one deck line 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, be a kind of cross section structure signal piezoelectric film sensor 510 being integrated into the pressure touch unit 50 on flexible PCB 52.
This flexible PCB 52 comprises the first basic unit 521, first line layer 522, adhesive layer 523, second line layer 524 and the second basic unit 525 from top to bottom successively.First basic unit 525 of basic unit 521, second can make for the material such as polyimide or polyester PET, and first line layer 522 and the second line layer 524 can be that layers of copper or other metal/alloy material are formed.The relevant position of adhesive layer 523 arranges hole 520 and the first line layer 522 of exposed portion and the second line layer 524.This hole 520 is for accommodating piezoelectric film sensor 510.
Piezoelectric film sensor 510 comprises piezoelectric membrane 511 and lays respectively at the upper conducting resinl 512 of piezoelectric membrane 511 both sides and lower conducting resinl 513.Upper conducting resinl 512 bonds with first line layer 522, lower conducting resinl 513 and the second line layer 524 bond, upper conducting resinl 512 and lower conducting resinl 513 are as two electrodes of piezoelectric film sensor 510, simultaneously also as the web member with flexible PCB 52, and the induced charge Signal transmissions produced by piezoelectric film sensor 510 is in the line layer of flexible PCB 52.In the structure shown in Figure 12, first line layer 522 as electro-magnetic screen layer, can be the conductive layer of whole, and arranges through hole at the correct position place 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 this flexible PCB 52 in the cross section at interface end place and front view.After part connection in first line layer 522 and the second line layer 524, draw ground connection feeler 534 in the interface end of flexible PCB 52.In addition, when flexible PCB 52 integrated multiple piezoelectric film sensor 510, the charge signal transmission of multiple piezoelectric film sensor 510 all occurs in the second line layer 524, and draws a signal feeler 533 respectively in the interface end of flexible PCB 52.Four signal feelers 533 are shown in Figure 14, this flexible PCB 52 have been 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 place, is conveniently connected with outside connector.Stiffening plate 532 can be formed by materials such as polyimide (PI) or polyethylene terephthalates (PET).
Figure 15 is the structural representation that this pressure touch unit 50 is applied in a touch control display apparatus.A side (lower surface in such as Figure 15) of this pressure touch unit 50 fits in casing 90 surface of touch control display apparatus by viscose glue such as optical cement OCA, glue etc., the casing 90 of the grounding of conduction serves the effect of electromagnetic screen; Simultaneously, another side (upper surface in such as Figure 15) of this pressure touch unit 50 fits in the side of capacitive touch control unit 20, and capacitive touch control unit 20 can be the various capacitance touching control solutions comprising in-cell and on-cell structure.Certainly in certain embodiments, another side of this pressure touch unit 50 also can fit in the side of cover sheet, or fits in the side of display module.
In other embodiment, the flexible PCB in pressure touch unit can only have one deck line layer, and forms the first basic unit and the second basic unit respectively in line layer both sides.Because the line layer of this flexible PCB is only as the signal transmitting layer for transmitting the charge signal that piezoelectric film sensor produces, therefore this pressure touch unit application is all conducted electricity in being fitted in its both sides and in the touch control display apparatus of grounding, utilizing the conductive structure of touch control display apparatus to realize electromagnetic shielding action.This kind of scheme eliminates the electro-magnetic screen layer in piezoelectric film sensor, therefore has less thickness.
Specifically as shown in Figure 16, the flexible PCB 62 in pressure touch unit 60 comprises the first basic unit 621, first line layer 622 and the second basic unit 623 from top to bottom successively.First basic unit 623 of basic unit 621, second can make for the material such as polyimide or polyester PET, and first line layer 622 can be that layers of copper or other metal/alloy material are formed.The relevant position of the second basic unit 623 arranges the first line layer 622 of hole 620 exposed portion.This hole 620 is for accommodating piezoelectric film sensor 610.
Piezoelectric film sensor 610 comprises piezoelectric membrane 611 and lays respectively at the upper conducting resinl 612 of piezoelectric membrane 611 both sides and lower conducting resinl 613.Upper conducting resinl 612 bonds with first line layer 622.Lower conducting resinl 613 is for bonding with the corresponding construction in touch control display apparatus.Upper conducting resinl 612 and lower conducting resinl 613 are as two electrodes of piezoelectric film sensor 610.
Figure 17 and Figure 18 respectively illustrates this flexible PCB 62 in the cross section at interface end place and front view.First line layer 622 draws signal feeler 633 in the interface end of flexible PCB 62.Because this first line layer 622 is only as Signal transmissions, do not play electromagnetic shielding action, so there is no corresponding circuit and draw ground connection feeler.When flexible PCB 56 integrated multiple piezoelectric film sensor 610, the charge signal transmission of multiple piezoelectric film sensor 610 all occurs in first line layer 622.Five signal feelers 633 are shown in Figure 18, this flexible PCB 62 have been integrated with five piezoelectric film sensors 610.In certain embodiments, the interface end of flexible PCB 62 also forms a stiffening plate 632 in the outside of the second basic unit 623.Stiffening plate 632, for strengthening the physical strength at interface end place, is conveniently connected with outside connector.Stiffening plate 632 can be formed by materials such as polyimide (PI) or polyethylene terephthalates (PET).
Figure 19 is the structural representation that this pressure touch unit 60 is applied in a touch control display apparatus.The side (lower surface in such as Figure 19) of this pressure touch unit 60 fits in casing 90 surface of touch control display apparatus, and the casing 90 of the grounding of conduction serves the effect of electromagnetic screen; Meanwhile, another side (upper surface in such as Figure 19) of this pressure touch unit 60 utilizes viscose glue 41 such as optical cement OCA, glue etc. to fit in the side of the display unit 40 of band metal frame.The ground connection attribute of casing 90 and display unit 40 is utilized to realize shielding periphery electromagnetic environment to the interference of the charge signal in the first line layer 622 in piezoelectric film sensor 610 and flexible PCB 62.Further, can arrange adhesive layer 91 between casing 90 and the second basic unit 623 of flexible PCB 62 is such as that foam rubber, double faced adhesive tape etc. are fixed between flexible PCB 62 and casing 90.
Understandably, above-mentioned display unit 40 also can be the display module of nonmetal frame, but at its plated surface one deck conductive layer and grounding.Understandably, in other embodiments, can fit with capacitive touch control unit in another side of this pressure touch unit 60, capacitive touch control unit can be various types of capacitance touching control solutions, can also be that the capacitance touching control that capacitance touching control and display module are integrated shows module.
As shown in figure 20, the piezoelectric film sensor 710 that the pressure touch unit 70 that another embodiment of the utility model provides comprises comprises piezoelectric membrane 711, lays respectively at top electrode 712 and the bottom electrode 713 of piezoelectric membrane 711 both sides.Top electrode 712 and bottom electrode 713 are conducting resinl.The two-sided conducting resinl of piezoelectric membrane 711 both sides not only plays piezoelectric membrane upper/lower electrode, also with flexible PCB 72 and play adhesion effect when assembling with other base material.The surface area of top electrode 712, bottom electrode 713 is identical with the surface area of piezoelectric membrane 711, or 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 utility model provides comprises, comprises the first basic unit 721, first line layer 722, first encapsulated layer 723, second line layer 724 and the second basic unit 725 from top to bottom successively.Encapsulated layer and basic unit can be made up of the material such as polyimide or polyester PET.First line layer 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 the first encapsulated layer 723, makes the part line conduction in first line layer 722 and the second line layer 724, and grounding, to play the effect of electromagnetic screen.Second line layer 724 is the signal transmitting layer of flexible PCB 72, the electric signal that piezoelectric film sensor 710 produces, and is transferred to the interface end of flexible PCB 72 by the second line layer 724.Second basic unit 725 is arranged hole 720 for accommodating piezoelectric film sensor 710.Second line layer 724 of this hole 720 exposed portion connects for the top electrode 712 of piezoelectric film sensor 710.
As shown in figure 21 and figure, be sectional view and the front view (FV) of the interface end of flexible PCB 72.At interface end place, the second line layer 724 of the top electrode 712 of each piezoelectric film sensor 710 of the connection on flexible PCB 72 draws multiple signal feeler 733.In addition, the part line conduction in first line layer 722 and the second line layer 724 also draws ground connection feeler 734 for grounding.Ground connection feeler 734 and signal feeler 733 are positioned at same plane, thus can be connected with the connector of outside.
The induced charge that piezoelectric film sensor 710 produces is transferred to the second line layer 724 in flexible PCB 72 by top electrode 712; Bottom electrode 713 is directly connected with the base material of touch control display apparatus, can realize for making piezoelectric film sensor 710 resisting electromagnetic interference (EMI), bottom electrode 713 should be connected to be grounded effect with the ground connection base material of conduction, therefore bottom electrode 713 can the casing of bonded metal or alloy material, or the bonding display unit with metal frame, or be coated with the display unit of the conductive layers such as metal grounding.
In above-mentioned pressure touch unit 70, using the first line layer 722 in flexible PCB 72 and the bottom electrode 713 in piezoelectric film sensor 710 ground shield as piezoelectric film sensor 710, while effectively this pressure touch unit 70 of reduction is subject to electromagnetic interference (EMI), reduce the thickness of pressure touch unit 70.
Multiple piezoelectric film sensor 710 can be assembled in a flexible PCB 72 with the integrated of flexible PCB 72 by the piezoelectric film sensor 710 in the utility model simultaneously, and the charge signal that each piezoelectric film sensor 710 produces is transferred to the interface end of flexible PCB 72 by the second line layer 724.First line layer 722 guides in the part circuit of the second line layer 724 of flexible PCB 72 by the mode arranging passage on the first encapsulated layer 723, thus finally connect the signal feeler 733 of the top electrode 712 of each piezoelectric film sensor 710 and be positioned at same plane for the ground connection feeler 734 of ground connection at interface end place, thus realization carries out ZIF plug-in type with other connector or BTB press-button type is connected.
In certain embodiments, the interface end of flexible PCB 32 also forms a stiffening plate 732 in the outside of the first basic unit 721.Stiffening plate 732, for strengthening the physical strength at interface end place, is conveniently connected with outside connector.Stiffening plate 732 can be formed by materials such as polyimide (PI) or polyethylene terephthalates (PET).
Below in conjunction with Figure 23, the integrated step of above-mentioned pressure touch unit 70 in touch control display apparatus is described.The piezoelectric film sensor 710 that Figure 23 shows in pressure touch unit 70 is bonding with the conductive base in touch control display apparatus by bottom electrode 713.This conductive base can be the casing 90 of conduction, also can be the display unit 40 with metal frame, or be coated with the display unit 40 of conductive layer.Wherein the second base material 725 of flexible PCB 72 is such as that foam rubber, double faced adhesive tape etc. are adhesively fixed with casing 90 or display unit 40 by adhesive layer 91.
The integrated approach of the piezoelectric film sensor 710 that above-mentioned pressure touch unit 70 comprises and flexible PCB 72 can comprise following flow process:
One, the preparation of flexible PCB, according to the flexible PCB of technique preparation containing two line layers above addressed.Wherein first line layer and the second line layer are by the passage arranged in encapsulated layer, make the part line conduction in first line layer and the second line layer, and draw ground connection feeler at the interface end place of flexible PCB for ground connection.Then cabling design is carried out in the quantity of integrated piezoelectric thin film sensor and position to second line layer according to schedule.Wherein the correct position of the second basic unit arranges hole, and with the second line layer of exposed portion, this hole place is for installing piezoelectric film sensor.
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 in the hole place of flexible PCB, and one of them conducting resinl is adhesively fixed with the second line layer exposed; The concrete order of wherein above-mentioned step 2 and step 3 can adjust flexibly, and such as conducting resinl first can fit in the hole place of flexible PCB and the second line layer bonds, then is covered on by piezoelectric membrane on this conducting resinl;
Four, stick foam rubber at second basic unit's lower surface of flexible PCB, the piezoelectric film sensor wherein on flexible PCB is outside exposed, is not covered by foam rubber; And then this pressure touch unit is fitted on the casing of conduction or the display unit of bonnet surface earthing process, when the thickness of foam rubber is slightly larger than the thickness of piezoelectric film sensor containing two-layer conducting resinl, the position can docked with piezoelectric film sensor at casing arranges a bulge-structure; Simultaneously also can by increasing the thickness of piezoelectric film sensor and reducing the thickness of foam rubber, piezoelectric film sensor is added, and the thickness of the thickness of two-layer two-sided conducting resinl and foam rubber is close, then casing or display unit do not need to arrange bulge-structure in addition again, just can fit with this pressure touch unit.
Figure 24 and Figure 25 shows the embody rule of above-mentioned pressure touch unit in a touch control display apparatus.This touch control display apparatus comprises casing 90 and cover sheet 10, and capacitive touch control unit 20, display unit 40 and pressure touch unit 70 are arranged in the accommodating cavity that casing and cover sheet 10 formed.Pressure touch unit 70 can be arranged 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, also i.e. capacitive touch control unit 20 and the integrated setting of display unit 40.In certain embodiments, the position of the piezoelectric film sensor 710 of casing 90 corresponding pressure touch control unit 70 is provided with protruding 92, and the problems affect differed to avoid the height brought because of structures such as employing adhesive layers in pressure touch unit 70 is to assembly precision.The impact of projection 92 on the display effect of display unit 40 when pressing screen for reducing, display unit 40 preferably adopts the display module with metal frame.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this instructions is recorded.
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (10)
1. a pressure touch unit, be applied to touch control display apparatus with recognizing site information, it is characterized in that comprising flexible PCB, be arranged on the some pressure transducers on flexible PCB and control chip, flexible PCB is provided with transmission line, the corresponding electrical resistance of described pressure transducer connects these transmission lines, described pressure touch unit produces electric signal respectively and inputs described control chip by the transmission line of described flexible PCB time stressed in described touch control display apparatus reception touch operation, described control chip obtains point force information of these touch sensing positions according to these electric signal, thus according to the positional information of these component information acquisition contactor control device stress points.
2. pressure touch unit according to claim 1, is characterized in that, described control chip is arranged on described flexible PCB, and described control chip and pressure transducer are electrically connected by the transmission line of described flexible PCB.
3. pressure touch unit according to claim 1, is characterized in that, described pressure transducer is piezoelectric film sensor, resistance-type force snesor, capacitive force transducer or metal strain meter.
4. pressure touch unit according to claim 1, is characterized in that, described flexible PCB is multiple, and is connected by syndeton.
5. pressure touch unit according to claim 4, is characterized in that, described pressure transducer is arranged on the end points place of flexible PCB.
6. a touch control display apparatus, comprises cover sheet, capacitive touch control unit, pressure touch unit and display unit, and wherein pressure touch unit is the pressure touch unit in claim 1-5 item described in any one.
7. touch control display apparatus according to claim 6, is characterized in that, described cover sheet, capacitive touch control unit, pressure touch unit and display unit set gradually.
8. touch control display apparatus according to claim 6, is characterized in that, described cover sheet, capacitive touch control unit, display unit and pressure touch unit set gradually.
9. touch control display apparatus according to claim 6, is characterized in that, described cover sheet, pressure touch unit, capacitive touch control unit and display unit set gradually.
10. the touch control display apparatus according to claim 7-9 any one; it is characterized in that, this cover sheet is roughly rectangle, and the quantity of described pressure transducer is 4; respectively near 4 jiaos of described cover sheet, or respectively near 4 jiaos of described display unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520372331.8U CN204695287U (en) | 2015-06-02 | 2015-06-02 | Touch control display apparatus and pressure touch unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520372331.8U CN204695287U (en) | 2015-06-02 | 2015-06-02 | Touch control display apparatus and pressure touch unit |
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| CN204695287U true CN204695287U (en) | 2015-10-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106293181A (en) * | 2015-06-02 | 2017-01-04 | 南昌欧菲光科技有限公司 | Touch control display apparatus and pressure touch unit |
| CN106325707A (en) * | 2016-08-17 | 2017-01-11 | 深圳天珑无线科技有限公司 | Method and system for realizing screen wakeup and put-out, and equipment |
| CN108874214A (en) * | 2018-05-25 | 2018-11-23 | 业成科技（成都）有限公司 | It is touch panel structure provided |
| CN111130528A (en) * | 2020-02-10 | 2020-05-08 | 芯海科技（深圳）股份有限公司 | Pressure sensor module and electronic equipment |
| CN112654953A (en) * | 2019-08-12 | 2021-04-13 | 京东方科技集团股份有限公司 | Display device and terminal |
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2015
- 2015-06-02 CN CN201520372331.8U patent/CN204695287U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106293181A (en) * | 2015-06-02 | 2017-01-04 | 南昌欧菲光科技有限公司 | Touch control display apparatus and pressure touch unit |
| CN106293181B (en) * | 2015-06-02 | 2023-12-05 | 安徽精卓光显技术有限责任公司 | Touch display device and pressure touch unit |
| CN106325707A (en) * | 2016-08-17 | 2017-01-11 | 深圳天珑无线科技有限公司 | Method and system for realizing screen wakeup and put-out, and equipment |
| CN108874214A (en) * | 2018-05-25 | 2018-11-23 | 业成科技（成都）有限公司 | It is touch panel structure provided |
| TWI662332B (en) * | 2018-05-25 | 2019-06-11 | 大陸商業成科技（成都）有限公司 | Touch panel structure |
| CN108874214B (en) * | 2018-05-25 | 2021-05-04 | 业成科技（成都）有限公司 | Touch panel structure |
| CN112654953A (en) * | 2019-08-12 | 2021-04-13 | 京东方科技集团股份有限公司 | Display device and terminal |
| CN112654953B (en) * | 2019-08-12 | 2024-04-26 | 京东方科技集团股份有限公司 | Display device and terminal |
| CN111130528A (en) * | 2020-02-10 | 2020-05-08 | 芯海科技（深圳）股份有限公司 | Pressure sensor module and electronic equipment |
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Effective date of registration: 20161102 Address after: 518106 Guangdong province Shenzhen Guangming New Town of Gongming White Pine Road HUAFA Road Light Technology Park Patentee after: Shenzhen OFilm Tech Co.,Ltd. Address before: 330000 Jiangxi city of Nanchang province Huangjiahu road Nanchang economic and Technological Development Zone Patentee before: Nanchang OFilm Tech. Co.,Ltd. Patentee before: Shenzhen OFilm Tech Co.,Ltd. Patentee before: Suzhou OFilm Tech. Co.,Ltd. |
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Granted publication date: 20151007 Termination date: 20190602 |
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