CN204808295U - Touch -control display screen and display device - Google Patents
Touch -control display screen and display device Download PDFInfo
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- CN204808295U CN204808295U CN201520508991.4U CN201520508991U CN204808295U CN 204808295 U CN204808295 U CN 204808295U CN 201520508991 U CN201520508991 U CN 201520508991U CN 204808295 U CN204808295 U CN 204808295U
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Abstract
The utility model relates to a touch -control display screen and display device. Electric capacity inductive layer, display module assembly in visor board one side lap, set up to this touch -control display screen including the protection to and set up the forced induction layer of keeping away from protection apron one side at the display module assembly, and the forced induction layer includes the piezoelectric membrane and lies in the electrode layer of piezoelectric membrane both sides, and each electrode layer includes the electrode, and wherein the electrode in at least one electrode layer is the array electrode. The utility model discloses utilize piezoelectric membrane lower surface preparation above that array electrode to form array pressure sensors, can realize the detection to the power information of a plurality of touch -control points, slow down in the use destruction to the display module assembly simultaneously.
Description
Technical field
The utility model belongs to touch-control display field, relates to a kind of touching display screen and has the display device of this touching display screen.
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.And the mode of existing increase pressure transducer is to realize the pressure information that pressure sensitive function can only detect the touch point of pressure transducer position, for the induction of other touch points beyond pressure transducer position and out of true.In addition, the pressure transducer of point-like causes negative effect to existing device architecture, such as, when pressure transducer is arranged on below display module, display can be caused abnormal after permanent use.
Utility model content
Based on this, be necessary for the problems referred to above, a kind of touching display screen be provided and adopt the display device of this touching display screen.
A kind of touching display screen; comprise cover sheet, be arranged on the capacitive sensing layer of cover sheet side, show module; and be arranged on the pressure sensitive layer of display module away from cover sheet side; pressure sensitive layer comprises piezoelectric membrane and is positioned at the electrode layer of piezoelectric membrane both sides; each electrode layer comprises electrode, and the electrode wherein at least one electrode layer is array-type electrode.
Wherein in an embodiment, described array-type electrode is block type electrode or the strip shaped electric poles of array arrangement.
Wherein in an embodiment, the electrode in described electrode layer is formed directly into piezoelectric membrane both sides by sputtering, evaporation, plated film or silk-screen mode, thus is electrically connected with piezoelectric membrane.
Wherein in an embodiment, each electrode layer also comprises base material, and the electrode of each electrode layer is formed in the side of described base material, and described electrode layer is bonded in the both sides of piezoelectric membrane respectively.
Wherein in an embodiment, base material, between piezoelectric membrane and electrode, is non-electric connection between described electrode and piezoelectric membrane.
Wherein in an embodiment, electrode is between piezoelectric membrane and base material, and the electrode in electrode layer is electrically connected by conducting resinl and piezoelectric membrane.
Wherein in an embodiment, described base material is flexible PCB.
Wherein in an embodiment, also arrange electro-magnetic screen layer in described base material, described electro-magnetic screen layer is positioned at the side of electrode away from piezoelectric membrane.
A kind of display device, comprises any one touching display screen above-mentioned.
Wherein in an embodiment, also comprise casing, described casing conduction also grounding, described casing is as the electro-magnetic screen layer of piezoelectric membrane.
Wherein in an embodiment, described display module comprises conductive substrate, and described conductive substrate is as the electro-magnetic screen layer of piezoelectric membrane.
The utility model utilizes piezoelectric membrane lower surface making thereon array-type electrode, thus forms array pressure inductor, can realize the detection of the force information to multiple touch point, slow down in use to the destruction of display module simultaneously.In addition, the utility model can be selected by carrying out voltage detecting or capacitance detecting to piezoelectric membrane indirectly to realize the detection to power.When choice for use detects the capacitance detecting of piezoelectric membrane, also can share touch chip with capacitive sensing layer, thus reduce costs.
Accompanying drawing explanation
The structural representation of the touching display screen that Fig. 1 provides for the utility model one embodiment;
The structural representation of the touching display screen that Fig. 2 provides for another embodiment of the utility model;
The structural representation of the pressure sensitive layer in the touching display screen that Fig. 3 provides for the utility model one embodiment;
The part-structure schematic diagram of the pressure sensitive layer in the touching display screen that Fig. 4 and Fig. 5 provides for another embodiment of the utility model;
The part-structure schematic diagram of the pressure sensitive layer in the touching display screen that Fig. 6 provides for the another embodiment of the utility model;
Fig. 7 is the part-structure schematic diagram of the pressure sensitive layer in the utility model again touching display screen that provides of an embodiment;
Fig. 8 is the part-structure schematic diagram of the pressure sensitive layer in the utility model also touching display screen that provides of an embodiment.
Embodiment
As shown in Figure 1; a kind of touching display screen that the utility model one embodiment provides comprises cover sheet 10, is arranged on the capacitive sensing layer 12 of cover sheet 10 side, shows module 14, and is arranged on the pressure sensitive layer 16 of display module 14 away from cover sheet 10 side.
As shown in Figure 2, capacitive sensing layer and the display module accessible site of the touching display screen that another embodiment of the utility model provides are arranged, and form capacitance touching control display module 13.
Cover sheet 10 can be tempered glass cover plate, plastic cover plate, polymethylmethacrylate (PMMA) cover plate etc.
Capacitive sensing layer 12 comprises capacitive transducer, the flexible PCB be connected with capacitive transducer and capacitance touching control chip.Capacitive transducer comprises multiple drive electrode and induction electrode, and these two kinds of touch control electrode can be distributed in same base material, or is distributed in two different base materials respectively.Capacitive transducer also comprises the leading electrode (such as silver is starched) 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.Capacitance touching control chip can be arranged on the flexible PCB of capacitive sensing layer 12, also can be arranged on the mainboard of the display device that touching display screen is applied, such as when this display device is mobile phone, the capacitance touching control chip of capacitive sensing layer 12 can be integrated and be arranged on the mainboard of mobile phone.
Capacitive sensing layer 12 can detect by capacity coupled mode the precise position information obtaining multiple touch point.In this embodiment, capacitive sensing layer 12 is located immediately at the side of cover sheet 10.
Pressure sensitive layer 16 directly can fit in display module 14 away from cover sheet 10 side.
As shown in Figure 3, in an embodiment, pressure sensitive layer 16 comprises piezoelectric membrane 161 and is positioned at the electrode layer of piezoelectric membrane 161 both sides.
In one embodiment, pressure sensitive layer 16 also comprises corresponding flexible PCB and touch chip.In certain embodiments, the flexible PCB of pressure sensitive layer 16 and touch chip can share with the flexible PCB in capacitive sensing layer 12 and capacitance touching control chip.
Piezoelectric membrane 161 can be inorganic piezoelectric film or organic piezoelectric film, wherein inorganic piezoelectric material can be zinc-oxide film, Al-Doped ZnO film, lead lanthanum zirconate titanate PLZT piezoelectric membrane and other piezoceramic material, and organic piezoelectric film can be the piezoelectric membranes such as polyvinylidene fluoride PVDF, porous polypropylene piezoelectric membrane, PLA piezoelectric membrane.The thickness of piezoelectric membrane 161 is 0.01-2 μm.
As shown in Figure 3, the electrode 163,165 that the upper surface electrode layer of piezoelectric membrane 161 both sides and lower surface electrode layer comprise can be formed directly into piezoelectric membrane 161 both sides by modes such as sputtering, evaporation, plated film, silk-screens.Electrode 163,165 for arrange facing each otherly, and can be rendered as array-type electrode block; Also can be for upper surface electrode 163 and lower surface electrode 165 strip shaped electric poles that array arranges, and the mutual square crossing of the electrode on upper and lower surface, there is certain intersection area; Can also be side be whole the electrode be interconnected, opposite side be array-type electrode, the electrode that such as upper surface electrode 163 arranges for array, and lower surface electrode 163 is then whole electrode.
Material as electrode can be the conductive materials such as silver powder, carbon dust, ITO, ZnO, polythiophene, nano silver wire, carbon nano-tube, Graphene.
The electrode of piezoelectric membrane 161 both sides also directly can not be formed at the upper and lower surface of piezoelectric membrane 161.As shown in Figure 4 and Figure 5, the electrode layer 162 of piezoelectric membrane 161 side comprises the electrode 163 on base material 164 and formation base material 164; The electrode layer 166 of piezoelectric membrane 161 opposite side comprises base material 167 and is formed in the electrode 165 on base material 167.Electrode layer 162,166 also comprises the leading electrode with electrode 163,165 conducting.Leading electrode is used for being connected conducting with the flexible PCB of pressure sensitive layer 16.
Base material 164,167 can be the base material of the type such as PET or other polyester.Electrode layer 162,166 forms conductive communication by anisotropic conductive or other common conductive glue and piezoelectric membrane 161 again.Electrode 163,165 shown in Fig. 4 and Fig. 5 is all in array-type electrode, and all in bar formula electrode, only the bearing of trend of electrode 163,165 is orthogonal.Be appreciated that the shape of array-type electrode can also be box-shaped, prismatic, triangle, trapezoidal or other shapes.In such cases, electrode 163,165 all forms conductive adhesive by anisotropic conductive and piezoelectric membrane 161.Understandably, one of them in electrode 163,165 can be whole electrode, when for whole electrode, other conducting resinls and piezoelectric membrane 161 also can be adopted to form conductive adhesive.
In above-described embodiment, piezoelectric membrane and two lateral electrodes electrically conduct, and are also that electrode is between base material and piezoelectric membrane.As shown in Figure 8, in an embodiment, piezoelectric membrane 161 both sides to be reached with electrode 163,165 respectively by colloid 20 and are connected, and described colloid 20 is conducting resinl, and piezoelectric membrane 161 is electrically conducted by conducting resinl and two lateral electrodes 163,165.
Because piezoelectric membrane 161 is when stressed, induced charge can be produced by the electrode in piezoelectric membrane 161 both sides, therefore can realize the detection of pressure sensitive layer to power according to detection induced charge signal.For the detection of induced charge signal, also in conjunction with charge amplifying circuit, voltage amplifier circuit and touch chip, signal can be realized eventually through the mode detecting voltage and detects.In addition, also directly charge signal can be detected by the touch-control IC of existing capacitive touch screen.
On the other hand, when piezoelectric membrane 161 is stressed, its both side surface can produce induced charge, produce electric capacity between corresponding both side surface, the size of electric capacity is relevant to pressure size, therefore, in another embodiment, also can realize signal by the mode of Detection capacitance and detect.Be appreciated that Detection capacitance realizes by the capacitance touching control chip in shared capacitive sensing layer 12.
In some other embodiments, the electrode of piezoelectric membrane 161 both sides also can be reached non-conductive bonding with the upper and lower surface of piezoelectric membrane 161, and this can be reached by two kinds of modes.
One is that electrode can between base material and piezoelectric membrane, electrode is bonding with piezoelectric membrane by non-conductive adhesive, as shown in Figure 8, colloid 20 can adopt non-conductive glue such as such as OCA, glue etc. to reach non-conductive bonding by electrode 163,165 and piezoelectric membrane 161.
Another be base material between piezoelectric membrane and electrode, base material is bonding with piezoelectric membrane.As shown in Figure 6, in an embodiment, piezoelectric membrane 161 both sides, respectively by the bonding base material 164,167 of colloid 20, the side that base material 164,167 deviates from piezoelectric membrane 161 form electrode 163,165.
Electrode and the upper and lower surface of piezoelectric membrane 161 of piezoelectric membrane 161 both sides reach non-conductive bonding when, piezoelectric membrane 161 can think electrostatic condenser.When different acting forces puts on piezoelectric membrane 161, its equivalent capacity can change, and therefore can realize indirectly detecting of touch-control power to the detection of the capacitance signal of pressure sensitive layer.Can with the capacitance signal of an independently touch chip detected pressures inductive layer, the touch chip that also can share capacitive sensing layer carrys out the capacitance signal of detected pressures inductive layer.In addition, due to piezoelectric membrane stressed after, film both sides produce induced charge, also can produce the contrary induced charge of symbol with on the electrode of the non-conductive electrical connection of film, therefore also can realize the detection of pressure sensitive layer to power according to detection induced charge signal.Detection mode for induced charge signal is identical with aforementioned manner, jointly can be detected or detection chip directly detects by amplifying circuit and detection chip.
As shown in Figure 7, in one embodiment, the carrier substrate as electrode 163 can be flexible PCB 168.Also be, the electrode of piezoelectric membrane 161 both sides can first be produced on the flexible PCB 168 of piezoelectricity inductive layer 16, the form bonded by conducting resinl again makes piezoelectric membrane 161 and electrode 163 reach to electrically conduct, or forms non-electric connection by non-conductive adhesive and piezoelectric membrane 161.
In one embodiment, in the base material of described electrode layer, also electro-magnetic screen layer is set, to strengthen the anti-electromagnetic interference capability of pressure sensitive layer 16.Described electro-magnetic screen layer is positioned at the side of electrode away from piezoelectric membrane.
Particularly, as shown in Figure 8, form electro-magnetic screen layer 173 in base material 164, electro-magnetic screen layer 173 and electrode 163 interval arrange and are positioned at the side of electrode 163 away from piezoelectric membrane 161.In base material 167, form electro-magnetic screen layer 175, electro-magnetic screen layer 175 and electrode 165 interval arrange and are positioned at the side of electrode 165 away from piezoelectric membrane 161.
In certain embodiments, base material 164,167 shown in Fig. 8 can be flexible PCB, electrode 163,165 and electro-magnetic screen layer 173,175 are integrated and are arranged in flexible PCB, such as electro-magnetic screen layer 173,175 can be the some conductive layers in flexible PCB, thus utilize the ground connection attribute of flexible PCB, can avoid as piezoelectric membrane 161 arranges extra electro-magnetic screen layer.Electro-magnetic screen layer 173,175 can be that the conductive materials such as metal, metal alloy, tin indium oxide are formed.
The utility model also provides a kind of display device with above-mentioned touching display screen.Utilize the ground structure in display device also can as the electro-magnetic screen layer of pressure sensitive layer 16.Such as, this display device also comprises casing, and described casing conduction also grounding, described casing is as the electro-magnetic screen layer of piezoelectric membrane 161.Again such as, described display module 14 comprises conductive substrate, and described conductive substrate is as the electro-magnetic screen layer of piezoelectric membrane 161.
The utility model utilizes piezoelectric membrane lower surface making thereon array-type electrode, thus forms array pressure inductor, can realize the detection of the force information to multiple touch point, slow down in use to the destruction of display module simultaneously.In addition, the utility model can be selected by carrying out voltage detecting or capacitance detecting to piezoelectric membrane indirectly to realize the detection to power.When choice for use detects the capacitance detecting of piezoelectric membrane, also can share touch chip with capacitive sensing layer, thus reduce costs.
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 (11)
1. a touching display screen; comprise cover sheet, be arranged on the capacitive sensing layer of cover sheet side; and display module; it is characterized in that; also comprise and be arranged on the pressure sensitive layer of display module away from cover sheet side; described pressure sensitive layer comprises piezoelectric membrane and is positioned at the electrode layer of piezoelectric membrane both sides, and each electrode layer comprises electrode, and the electrode wherein at least one electrode layer is array-type electrode.
2. touching display screen according to claim 1, is characterized in that, described array-type electrode is block type electrode or the strip shaped electric poles of array arrangement.
3. touching display screen according to claim 1, is characterized in that, the electrode in described electrode layer is formed directly into piezoelectric membrane both sides by sputtering, evaporation, plated film or silk-screen mode, thus is electrically connected with piezoelectric membrane.
4. touching display screen according to claim 1, is characterized in that, each electrode layer also comprises base material, and the electrode of each electrode layer is formed in the side of described base material, and described electrode layer is bonded in the both sides of piezoelectric membrane respectively.
5. touching display screen according to claim 4, is characterized in that, base material, between piezoelectric membrane and electrode, is non-electric connection between described electrode and piezoelectric membrane.
6. touching display screen according to claim 4, is characterized in that, electrode is between piezoelectric membrane and base material, and the electrode in electrode layer is electrically connected by conducting resinl and piezoelectric membrane.
7. according to the touching display screen in claim 4-6 item described in any one, it is characterized in that, described base material is flexible PCB.
8. touching display screen according to claim 7, is characterized in that, also arranges electro-magnetic screen layer in described base material, and described electro-magnetic screen layer is positioned at the side of electrode away from piezoelectric membrane.
9. a display device, comprises the touching display screen described in any one in claim 1-7 item.
10. display device according to claim 9, is characterized in that, also comprises casing, and described casing conduction also grounding, described casing is as the electro-magnetic screen layer of piezoelectric membrane.
11. display device according to claim 9, is characterized in that, described display module comprises conductive substrate, and described conductive substrate is as the electro-magnetic screen layer of piezoelectric membrane.
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| CN105468203A (en) * | 2016-02-04 | 2016-04-06 | 重庆墨希科技有限公司 | Mutual induction type graphene pressure touch screen |
| CN105588585A (en) * | 2015-12-15 | 2016-05-18 | 感至源电子科技（上海）有限公司 | Composite shielding type piezoelectric film sensor |
| CN105700738A (en) * | 2015-12-21 | 2016-06-22 | 联想(北京)有限公司 | Touch display screen and electronic device |
| CN105739756A (en) * | 2016-01-19 | 2016-07-06 | 北京小米移动软件有限公司 | Terminal electronic device |
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| US11093088B2 (en) | 2017-08-08 | 2021-08-17 | Cambridge Touch Technologies Ltd. | Device for processing signals from a pressure-sensing touch panel |
| CN110261011A (en) * | 2018-03-12 | 2019-09-20 | 华一声学股份有限公司 | Thin film sensor |
| CN108510953A (en) * | 2018-04-17 | 2018-09-07 | 厦门天马微电子有限公司 | Display panel and display device |
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