WO2017078448A1 - Electronic device having pressure sensor - Google Patents

Electronic device having pressure sensor Download PDF

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Publication number
WO2017078448A1
WO2017078448A1 PCT/KR2016/012629 KR2016012629W WO2017078448A1 WO 2017078448 A1 WO2017078448 A1 WO 2017078448A1 KR 2016012629 W KR2016012629 W KR 2016012629W WO 2017078448 A1 WO2017078448 A1 WO 2017078448A1
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WIPO (PCT)
Prior art keywords
pressure sensor
piezoelectric
electronic device
layer
piezoelectric layer
Prior art date
Application number
PCT/KR2016/012629
Other languages
French (fr)
Korean (ko)
Inventor
박인길
노태형
정준호
Original Assignee
주식회사 모다이노칩
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from KR1020160143268A external-priority patent/KR101880670B1/en
Application filed by 주식회사 모다이노칩 filed Critical 주식회사 모다이노칩
Priority to CN201680078534.3A priority Critical patent/CN108475140A/en
Priority to US15/774,260 priority patent/US20180329558A1/en
Publication of WO2017078448A1 publication Critical patent/WO2017078448A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means

Definitions

  • the present invention relates to an electronic device, and more particularly, to an electronic device having a pressure sensor capable of performing a predetermined function by a user's touch and preventing a touch input error.
  • input devices are used for the operation of electronic devices such as mobile communication terminals.
  • input devices such as buttons, keys, and touch screen panels are used.
  • the touch screen panel that is, the touch sensor, detects the touch of the human body, and thus the use of the electronic device is easy and simple to operate with only a light touch. That is, there is a technical means for detecting and recognizing whether or not the contact with the human body (finger) or the pen using the detection of the human body current according to the contact, the pressure or the temperature change.
  • touch input devices are used not only for mobile communication terminals but also for operations of home appliances, industrial devices, automobiles, and the like.
  • a touch sensor used in an electronic device such as a mobile communication terminal may be provided between a protective window and a liquid crystal display panel displaying an image. Therefore, when a character or a symbol is displayed through a window from the liquid crystal display panel, and the user touches the corresponding portion, the touch sensor detects the position and performs a specific process according to the control flow.
  • the present invention provides an electronic device having a pressure sensor that can prevent the error of the touch input.
  • the present invention provides an electronic device having a pressure sensor that can improve brittleness.
  • An electronic device includes a window; A display unit which displays an image through the window; And a pressure sensor for detecting a position and a pressure of a touch input applied through the window, wherein the pressure sensor includes first and second electrode layers spaced apart from each other, and a piezoelectric layer provided between the first and second electrode layers.
  • the piezoelectric layer includes a plate-like piezoelectric body provided in plural in the polymer.
  • the piezoelectric bodies are arranged in plural in one direction and in other directions crossing each other in the horizontal direction, and plural in the vertical direction.
  • the piezoelectric body is provided at a density of 30% to 99%.
  • the piezoelectric body includes a single crystal.
  • the piezoelectric body is an oriented raw material composition formed of a piezoelectric material having a perovskite crystal structure, and distributed in the oriented raw material composition, wherein ABO 3 (A is a divalent metal element and B is a tetravalent metal element) is generally used.
  • a seed composition formed of an oxide having the formula.
  • an electronic device includes a window; A display unit which displays an image through the window; And a pressure sensor for detecting a position and a pressure of a touch input applied through the window, wherein the pressure sensor includes first and second electrode layers spaced apart from each other, and a piezoelectric layer provided between the first and second electrode layers. It includes, and comprises a plurality of cutouts formed in the piezoelectric layer to a predetermined width and depth.
  • the cutout is formed to a depth of 50% to 100% of the thickness of the piezoelectric layer.
  • the piezoelectric layer includes a single crystal.
  • the piezoelectric layer is an orientation raw material composition formed of a piezoelectric material having a perovskite crystal structure, and distributed in the orientation raw material composition, wherein ABO 3 (A is a divalent metal element and B is a tetravalent metal element).
  • a seed composition formed of an oxide having the general formula.
  • the pressure sensor may include at least one of at least one first pressure sensor provided below the display unit and at least one second pressure sensor provided below the window.
  • the touch sensor may further include a touch sensor provided between the window and the display unit.
  • an insulating layer provided on at least one of an upper side of the first electrode layer, between the first and second electrode layers, and a lower side of the second electrode layer.
  • the apparatus may further include first and second connection patterns respectively provided on the first and second electrode layers and connected to each other.
  • the electronic device of the present invention may include a window, a display unit, and a pressure sensor, and at least one pressure sensor may be provided on at least one of the lower side of the display unit and the lower side of the window.
  • the pressure sensor may have a piezoelectric layer formed between the first and second electrode layers spaced apart from each other, and the piezoelectric layer may have a plurality of single crystal plate-shaped piezoelectric bodies.
  • an incision may be formed in a unit cell unit in the piezoelectric layer, and an elastic layer may be further formed in the incision.
  • the piezoelectric layer may have flexible characteristics.
  • the electronic device of the present invention may further include a touch sensor to more accurately detect the touch position and pressure by driving the touch sensor and the pressure sensor in conjunction with each other. That is, the touch sensor and the pressure sensor can detect the coordinates in the horizontal direction (that is, the X direction and the Y direction) at the same time, and the pressure sensor can detect the touch position more accurately by detecting the pressure in the vertical direction (that is, the Z direction).
  • FIG. 1 is a cross-sectional view of a pressure sensor according to a first embodiment of the present invention.
  • FIGS. 2 and 3 are schematic top views of first and second electrode layers in accordance with embodiments of the present invention of a pressure sensor.
  • FIG. 4 is a sectional view of a pressure sensor according to a second embodiment of the present invention.
  • 5 and 6 are plan and cross-sectional photographs of a pressure sensor according to a second embodiment of the present invention.
  • FIG. 7 is a sectional view of a pressure sensor according to a third embodiment of the present invention.
  • FIG. 8 is a sectional view of a pressure sensor according to a fourth embodiment of the present invention.
  • FIGS. 9 and 10 are top plan schematic views of first and second electrode layers according to other embodiments of the present invention of a pressure sensor.
  • 11 and 12 are front and rear perspective views of an electronic device having a pressure sensor according to a first embodiment of the present invention.
  • FIG. 13 is a partial cross-sectional view of the line AA ′ of FIG. 11;
  • FIG. 14 is a cross-sectional view of an electronic device according to a second embodiment of the present disclosure.
  • 15 is a schematic plan view showing an arrangement of the pressure sensor of the electronic device according to the second embodiment of the present disclosure.
  • 16 is a cross-sectional view of an electronic device having a pressure sensor according to a third embodiment of the present disclosure.
  • 17 is a schematic plan view showing an arrangement of the pressure sensor of the electronic device according to the fourth embodiment of the present disclosure.
  • 18 to 21 is a control block diagram of a pressure sensor according to embodiments of the present invention.
  • FIG. 22 is a block diagram illustrating a data processing method of a pressure sensor according to another embodiment of the present invention.
  • FIG. 23 is a block diagram of a fingerprint recognition sensor using a pressure sensor in accordance with embodiments of the present invention.
  • 24 is a cross-sectional view of a pressure sensor according to another embodiment of the present invention.
  • FIGS. 2 and 3 are schematic views of first and second electrode layers of the pressure sensor.
  • a pressure sensor may include a piezoelectric layer provided between the first and second electrode layers 100 and 200 spaced apart from each other, and the first and second electrode layers 100 and 200. 300).
  • the piezoelectric layer 300 may be provided with a plurality of plate-like piezoelectric body 310 having a predetermined thickness.
  • the first and second electrode layers 100 and 200 are spaced apart by a predetermined interval in the thickness direction (that is, the vertical direction), and the piezoelectric layer 300 is provided therebetween.
  • the first and second electrode layers 100 and 200 are formed on the first and second support layers 110 and 210 and the first and second support layers 110 and 210, respectively. It may include. That is, the first and second support layers 110 and 210 are formed to be spaced apart by a predetermined interval, and the first and second electrodes 120 and 220 are formed on the surfaces of the first and second support layers 110 and 210, respectively. .
  • the first and second electrodes 120 and 220 may be formed to face each other or may not be formed to face each other.
  • the first and second electrodes 120 and 220 may be formed to face the piezoelectric layer 300, so that one of them faces the piezoelectric layer 300 and the other does not face the piezoelectric layer 300.
  • the first and second electrodes 120 and 220 may be formed so as not to face the piezoelectric layer 300.
  • the first and second electrodes 120 and 220 may be formed in contact with the piezoelectric layer 300 or may not be in contact with each other.
  • the first support layer 110, the first electrode 120, the piezoelectric layer 300, the second electrode 220 and the second support layer 210 are laminated in the thickness direction from the lower side. Thus a pressure sensor can be implemented.
  • first and second support layers 110 and 210 support the first and second electrodes 120 and 220 so that the first and second electrodes 120 and 220 are formed on one surface thereof.
  • the first and second support layers 110 and 210 may be provided in a plate shape having a predetermined thickness.
  • the first and second support layers 110 and 210 may be provided in a film form to have flexible characteristics.
  • the first and second support layers 110 and 210 may be silicon, urethane, polyurethane, polyimide, PET, PC, or the like, and a liquid photocurable monomer. And prepolymers using oligomers, photoinitiates, and additives.
  • the first and second support layers 110 and 210 may be transparent or opaque in some cases.
  • a plurality of pores may be provided in at least one of the first and second support layers 110 and 210.
  • the second support layer 210 which may be bent downward according to the touch or press of the object and may be deformed, may include a plurality of pores.
  • the pores have a size of, for example, 1 ⁇ m to 500 ⁇ m and may be formed at a porosity of 10% to 95%.
  • the elastic force and the restoring force of the second support layer 210 may be further improved. In this case, when the porosity is less than 10%, the improvement of the elastic force and the restoring force is insignificant.
  • the porosity is greater than 95%, the shape of the second support layer 210 may not be maintained.
  • the first and second electrodes 120 and 220 may be formed of a transparent conductive material such as indium tin oxide (ITO) or antimony tin oxide (ATO).
  • the first and second electrodes 120 and 220 may be formed of a transparent conductive material other than such a material, or may be formed of an opaque conductive material such as silver (Ag), platinum (Pt), copper (Cu), or the like. have.
  • the first and second electrodes 120 and 220 may be formed to cross each other.
  • the first electrode 120 may be formed in one direction to have a predetermined width, and the first electrode 120 may be formed to be spaced apart from each other by a predetermined interval.
  • the second electrode 220 may be formed in another direction orthogonal to one direction to have a predetermined width, and the second electrode 220 may be formed to be spaced apart at a predetermined interval in one direction orthogonal to the other direction. That is, the first and second electrodes 120 and 220 may be formed in directions perpendicular to each other as shown in FIG. 2.
  • the first electrode 120 is formed to a predetermined width in the horizontal direction, which is arranged in a plurality of spaced apart a predetermined interval in the vertical direction
  • the second electrode 220 is formed to a predetermined width in the vertical direction, which is predetermined in the thin direction A plurality of spaced apart may be arranged.
  • the widths of the first and second electrodes 120 and 220 may be greater than or equal to the gap therebetween.
  • the widths of the first and second electrodes 120 and 220 may be narrower than the gap therebetween, but the width is preferably larger than the gap.
  • the ratio of the width and the spacing of the first and second electrodes 120 and 220 may be 10: 1 to 0.5: 1. That is, when the interval is 1, the width may be 10 to 0.5.
  • the first and second electrodes 120 and 220 may be formed in various shapes in addition to these shapes. For example, as shown in FIG.
  • one of the first and second electrodes 120 and 220 is formed on the support layer as a whole, and the other is a substantially rectangular shape having a predetermined width and spacing in one direction and the other direction. It may be formed in a plurality of patterns. That is, the plurality of first electrodes 120 may be formed in a substantially rectangular pattern, and the second electrodes 220 may be entirely formed on the second support layer 120. Of course, in addition to the square, a variety of patterns, such as a circle, a polygon is possible. In addition, one of the first and second electrodes 120 and 220 may be formed on the support layer as a whole, and the other may be formed in a grid shape extending in one direction and the other direction.
  • the first and second electrodes 120 and 220 may be formed to have a thickness of, for example, 0.1 ⁇ m to 500 ⁇ m, and the first and second electrodes 120 and 220 may have an interval of 1 ⁇ m to 10000 ⁇ m, for example. It can be formed as.
  • the first and second electrodes 120 and 220 may be in contact with the piezoelectric layer 300.
  • the first and second electrodes 120 and 220 may be kept spaced apart from the piezoelectric layer 300 by a predetermined distance, and when a predetermined pressure, for example, a user's touch input is applied, the first and second electrodes ( At least one of the 120 and 220 may be in contact with the piezoelectric layer 300 locally. In this case, the piezoelectric layer 300 may be compressed to a predetermined depth.
  • a plurality of holes may be formed in at least one of the first and second electrode layers 100 and 200.
  • a plurality of holes may be formed in the first electrode layer 100. That is, the plurality of holes may be formed in the electrode layer used as the ground electrode.
  • the hole may be formed in the second electrode layer 200 used as the signal electrode in addition to the first electrode layer 100, and may be formed in both the first and second electrode layers 100 and 200.
  • the holes may be formed such that at least one of the first and second electrodes 120 and 220 is removed to expose the first and second support layers 110 and 210, and the first and second electrodes 120, 220 as well as the first and second support layers 110 and 210 may be removed.
  • the holes may be formed to expose the support layers 110 and 210 by removing the electrodes 120 and 220, or may be formed to penetrate the support layers 110 and 210 from the electrodes 120 and 220.
  • the hole may be formed in an area where the electrodes 120 and 220 overlap.
  • a plurality of holes may be formed in the first electrode 120 in an area overlapping the second electrode 220.
  • one hole may be formed in an area overlapping with the second electrode 220, and two or more holes may be formed.
  • FIG. 2 even when the first and second electrodes 120 and 220 are formed in one direction and the other direction orthogonal thereto, regions where the first and second electrodes 120 and 220 intersect with each other.
  • Holes may be formed in the. Holes may be formed to facilitate compression of the dielectric layer 300.
  • Such holes can be formed, for example, with a diameter of 0.05 mm to 10 mm. When the diameter of the hole is less than 0.05mm, the compressive effect of the dielectric layer 300 may be reduced, and when the diameter exceeds 10mm, the restoring force of the dielectric layer 300 may be reduced.
  • the size of the hole can be variously changed according to the size of the pressure sensor or the input device.
  • the piezoelectric layer 300 is provided to have a predetermined thickness between the first and second electrode layers 100 and 200, and may be provided to have a thickness of, for example, 10 ⁇ m to 1000 ⁇ m. That is, the piezoelectric layer 300 may be provided in various thicknesses according to the size of the electronic device employing the pressure sensor, for example, may be provided in a thickness of 10 ⁇ m to 1000 ⁇ m.
  • the piezoelectric layer 300 may be formed using a substantially rectangular plate-like piezoelectric body 310 and a polymer 320 having a predetermined thickness. That is, a plurality of plate-shaped piezoelectric bodies 310 may be provided in the polymer 320 to form the piezoelectric layer 300.
  • the piezoelectric body 310 may be formed using, for example, PZT (Pb, Zr, Ti), NKN (Na, K, Nb), or BNT (Bi, Na, Ti) -based piezoelectric materials.
  • the piezoelectric material 310 may be formed of various piezoelectric materials, such as barium titanate, lead titanate, lead zirconate titanate, potassium niobate, and lithium niobate. (lithium niobate), lithium tantalate, sodium tungstate, zinc oxide, potassium niobate, potassium sodium niobate, bismuth ferrite, sodium niobate niobate), bismuth titanate, and the like.
  • the piezoelectric body 310 may be formed of a fluoride polymer or a copolymer thereof.
  • the predetermined plate-shaped piezoelectric body 310 that is, may be formed in a substantially rectangular plate shape having a predetermined length and a predetermined thickness in one direction and the other direction orthogonal thereto.
  • the piezoelectric body 310 may be formed in a size of 3 ⁇ m to 5000 ⁇ m.
  • the piezoelectric body 310 may be arranged in plural in one direction and in the other direction.
  • a plurality of layers may be arranged in a thickness direction (ie, a vertical direction) between the first and second electrode layers 100 and 200 and in a plane direction (ie, a horizontal direction) orthogonal thereto.
  • the piezoelectric body 310 may be arranged in at least two layers or more in the thickness direction, for example, may be formed in a five-layer structure, but the number of layers is not limited.
  • Various methods may be used to form the piezoelectric body 310 in a plurality of layers in the polymer 320.
  • the piezoelectric layer 300 may be formed by forming a piezoelectric layer having a predetermined thickness on the polymer layer having a predetermined thickness and stacking a plurality of piezoelectric layers.
  • the piezoelectric layer may be formed by arranging plate-shaped piezoelectric plates at predetermined intervals on the polymer layer having a thickness thinner than that of the piezoelectric layer 300, and may be stacked in plural to form the piezoelectric layer 300.
  • the piezoelectric layer 300 in which the piezoelectric body 310 is formed in the polymer 320 may be formed in various ways.
  • the piezoelectric body 310 is preferably the same size and spaced apart at equal intervals.
  • the piezoelectric body 310 may be provided at least two or more sizes and at least two or more intervals.
  • the piezoelectric body 310 may be formed at a density of 30% to 99%, and is preferably provided at the same density in all regions. That is, the piezoelectric body 310 may be provided in a content of 30% to 99% with respect to the piezoelectric layer 300 including the polymer.
  • the piezoelectric body 310 may be provided so that at least one region has a density of 60% or more. For example, if at least one area of the piezoelectric body 310 has a density of about 65% and at least another area has a density of 90%, it is possible to generate more power in a high density area, but at a density of 60% or more. When having the power generated in the piezoelectric layer 310 can be sufficiently sensed by the controller.
  • the piezoelectric body 310 is formed in a single crystal form and thus has excellent piezoelectric characteristics. That is, by using the piezoelectric body 310 in the form of a plate compared to the case of using a conventional piezoelectric powder, the piezoelectric properties are excellent, and thus pressure can be detected even by a fine touch, thereby preventing errors in the touch input.
  • the polymer 320 may include one or more selected from the group consisting of epoxy, polyimide, and liquid crystal crystalline polymer (LCP), but is not limited thereto.
  • the polymer 320 may be made of a thermosetting resin.
  • thermosetting resins include Novolac Epoxy Resin, Phenoxy Type Epoxy Resin, BPA Type Epoxy Resin and BPF Type Epoxy Resin. Hydrogenated BPA Epoxy Resin, Dimer Acid Modified Epoxy Resin, Urethane Modified Epoxy Resin, Rubber Modified Epoxy Resin and DC It may include one or more selected from the group consisting of PDPD type epoxy resin (DCPD Type Epoxy Resin).
  • the polymer 320 may be formed of a compressible and recoverable material.
  • the polymer 320 may be formed of a compressible and recoverable material among the materials.
  • the piezoelectric material 310 may be mixed using a compressible and recoverable material instead of the polymer 320 of the material.
  • silicone, rubber, gel, poron, urethane and the like can be used.
  • the piezoelectric layer 300 may further include an electromagnetic shielding and absorbing material. That is, the electromagnetic shielding and absorbing material may be further contained in the polymer 320. Such electromagnetic shielding and absorbing materials may utilize at least one or more materials having at least one or more sizes. That is, a homogeneous material having a plurality of sizes may be used, or two or more heterogeneous materials having a plurality of sizes may be used as the electromagnetic shielding and absorption material. As such, the electromagnetic shielding and absorbing material is further contained in the piezoelectric layer 300 to shield or absorb electromagnetic waves.
  • the electromagnetic shielding and absorbing material may include ferrite, alumina, or the like, and may be contained in an amount of 0.1 wt% to 50 wt% in the piezoelectric layer 300. That is, the electromagnetic shielding and absorbing material may be contained in an amount of 0.1 wt% to 50 wt% with respect to 100 wt% of the piezoelectric layer 300 material.
  • the electromagnetic shielding and absorbing material is less than 1% by weight, the electromagnetic shielding and absorbing properties are low, and when the electromagnetic shielding and absorbing material is more than 50% by weight, the piezoelectric properties of the piezoelectric layer 300 may decrease.
  • the piezoelectric material 310 is an orientation raw material composition formed of a piezoelectric material having a perovskite crystal structure, distributed in the orientation raw material composition, ABO 3 (A is a divalent metal element, B is a tetravalent metal element)
  • the orientation raw material composition may use a composition in which a material having a crystal structure different from the perovskite crystal structure forms a solid solution.
  • PbTiO 3 [PT] having a tetragonal structure and PbZrO having a rhombohedral structure PZT-based material in which 3 [PZ] forms a solid solution can be used.
  • the orientation raw material composition is Pb (Ni, Nb) O 3 [PNN], Pb (Zn, Nb) O 3 [PZN] and Pb (Mn, Nb) O 3 [PMN] as a relaxer in PZT-based materials. ] Can be used to improve the properties of the PZT-based material.
  • the PZN-based material and the PNN-based material may be used as the relaxer to form a PZNN-based material having high piezoelectric properties, low dielectric constant, and ease of sintering as a relaxer.
  • An orientation raw material composition employing a PZNN-based material as a relaxer in the PZT-based material is (1-x) Pb (Zr 0.47 Ti 0.53 ) O 3 -xPb ((Ni 1-y Zn y ) 1/3 Nb 2/3 ) It may have a composition formula of O 3 .
  • x may have a value in the range of 0.1 ⁇ x ⁇ 0.5, preferably may have a value in the range of 0.30 ⁇ x ⁇ 0.32, and most preferably may have a value of 0.31.
  • y may have a value in the range of 0.1 ⁇ y ⁇ 0.9, preferably a value in the range of 0.39 ⁇ y ⁇ 0.41, and most preferably may have a value of 0.40.
  • the orientation raw material composition may use a lead-free piezoelectric material containing no lead (Pb). Such a piezoelectric material is associated non-Bi 0 .5 K 0. 5 TiO 3 , Bi 0.5 Na 0.5 TiO 3, K 0. 5 Na 0.
  • Seed composition is formed of an oxide having a general formula of ABO 3,
  • ABO 3 is made of an oxide having a perovskite (perovskite) the structure of the plate-like having an orientation
  • A is a bivalent metal element
  • B is quadrivalent It consists of a metal element.
  • Oxide composition that is formed of an oxide having a general formula of ABO 3 may include CaTiO 3, BaTiO 3, SrTiO 3 , PbTiO 3 , and Pb, at least one of (Ti, Zr) O 3.
  • the seed composition may be included in a volume ratio of 1 vol% to 10 vol% with respect to the orientation raw material composition.
  • the effect of improving the crystal orientation by the seed composition is insignificant, and when it is included in excess of 10 vol%, the piezoelectric performance of the piezoelectric ceramic sintered compact is lowered.
  • the piezoelectric ceramic composition including the orientation raw material composition and the seed composition as described above is grown with the same orientation as the seed composition by a templated grain growth (TGG). That is, the piezoelectric ceramic sintered body is, for example, BaTiO 3 in the orientation raw material composition having a composition formula of 0.69Pb (Zr 0.47 Ti 0.53 ) O 3 -0.31Pb ((Ni 0.6 Zn 0.4 ) 1/3 Nb 2/3 ) O 3 .
  • TGG templated grain growth
  • a piezoelectric ceramic sintered body By adding a seed composition that improves crystal orientation to the orientation raw material composition and sintering the same, a piezoelectric ceramic sintered body can be manufactured, thereby maximizing the displacement amount according to the electric field and remarkably improving the piezoelectric properties.
  • the piezoelectric layer 300 is formed between the first and second electrode layers 100 and 200 spaced apart from each other, and the piezoelectric layer 300 has a predetermined single crystal.
  • a plurality of plate-shaped piezoelectric elements 310 may be provided.
  • PZT lead zirconatetita-nate ceramic
  • PZT has been in use for more than 80 years to date and has not been improved at this level.
  • Single crystal is a new material developed to meet these demands, and is a new material that can improve the performance of application devices by improving the physical properties of PZT ceramics.
  • a piezoelectric constant (d 33 ) of 2 times or more can be obtained, and the electromechanical coupling coefficient is also large and exhibits excellent piezoelectric properties.
  • piezoelectric single crystals can produce clearer images with ultrasonic vibrators, such as medical and non-destructive inspections and fish group detection, compared to conventional polycrystalline ceramics. It is more responsive and more compact than a high precision control actuator such as a positioning device and an anti-shake device.
  • the solid-state single crystal growth method Bridgman method, salt melting method, etc. can be used.
  • the piezoelectric layer can be formed by printing or molding.
  • FIG. 4 is a cross-sectional view of the pressure sensor according to the second embodiment of the present invention.
  • 5 and 6 are plan and cross-sectional photographs of the piezoelectric layer of the pressure sensor according to the second embodiment of the present invention.
  • the pressure sensor according to the second embodiment of the present invention may be disposed between the first and second electrode layers 100 and 200 spaced apart from each other, and the first and second electrode layers 100 and 200. It includes a piezoelectric layer 300 provided.
  • the piezoelectric layer 300 may be formed of a piezoelectric ceramic having a predetermined thickness. That is, in one embodiment of the present invention, the piezoelectric layer 300 has a plate-like piezoelectric body 310 formed in the polymer 320, but in another embodiment of the present invention, the piezoelectric layer 300 having a predetermined thickness using piezoelectric ceramics. ) Can be formed.
  • the piezoelectric layer 300 may use the same material as the piezoelectric body 310.
  • the piezoelectric layer 300 may be formed at a predetermined width and interval in one direction and the other direction opposite thereto. That is, the piezoelectric layer 300 may have a cutout 330 formed at a predetermined depth and may be separated in a plurality of widths and intervals.
  • the cutout 330 may include a plurality of first cutouts having a predetermined width in one direction, and a plurality of second cutouts having a predetermined width in another direction perpendicular to the cutouts 330. Therefore, the piezoelectric layer 300 may be divided into a plurality of unit cells having a predetermined width and spacing, as shown in FIGS. 5 and 6, by the plurality of first and second cutouts, respectively.
  • the entire thickness of the piezoelectric layer 300 may be cut, or a thickness of 50% to 95% of the total thickness may be cut. That is, the piezoelectric layer 300 may be cut in its entire thickness, or 50% to 95% of the total thickness may be cut to form a cutout. As the piezoelectric layer 300 is cut in this manner, the piezoelectric layer 300 has a predetermined flexible characteristic. In this case, the piezoelectric layer 300 may be cut to have, for example, a size of about 10 ⁇ m to about 5000 ⁇ m and an interval of about 1 ⁇ m to about 300 ⁇ m.
  • the unit cell may have a size of about 10 ⁇ m to about 5000 ⁇ m and have an interval of about 1 ⁇ m to about 300 ⁇ m.
  • the first and second cutouts of the piezoelectric layer 300 may correspond to gaps between the electrodes of the first and second electrode layers 100 and 200. That is, the first cutout may be formed to correspond to the gap of the first electrode of the first electrode layer 100, and the second cutout may be formed to correspond to the gap of the second electrode of the second electrode layer 200.
  • the spacing of the electrode layer and the spacing of the cut may be the same, the spacing of the electrode layer may be larger or smaller than the spacing of the cut.
  • the piezoelectric layer 300 may be cut by a method such as laser, dicing, or blade cut to form an incision.
  • the piezoelectric layer 300 may be formed by cutting in a green bar state by a laser, dicing, blade cut, etc. to form a cutout, and then performing a firing process.
  • FIG. 7 is a cross-sectional view of a pressure sensor according to a third embodiment of the present invention.
  • the pressure sensor according to the third embodiment of the present invention is provided between the first and second electrode layers 100 and 200 spaced apart from each other and the first and second electrode layers 100 and 200.
  • the piezoelectric layer 300 having the plurality of cutouts 330 formed in the direction and the other direction, and the elastic layer 400 formed on the cutouts 330 of the piezoelectric layer 300 may be included.
  • the cutout 330 may be formed over the entire thickness of the piezoelectric layer 300, and may be formed to have a predetermined thickness. That is, the cutout 330 may be formed to a thickness of 50% to 100% of the thickness of the piezoelectric layer 300.
  • the piezoelectric layer 300 may be separated by unit cuts 330 in one direction and the other by the cutout 330, and may be separated into unit cells, and an elastic layer 400 may be formed between the unit cells.
  • the elastic layer 400 may be formed using an elastic polymer, silicon, or the like. Since the piezoelectric layer 300 is cut and the elastic layer 400 is formed, the piezoelectric layer 300 may have a higher flexibility than other embodiments of the present invention in which the elastic layer 400 is not formed. That is, when the cutout 330 is formed in the piezoelectric layer 300 but the elastic layer is not formed, the flexible property of the piezoelectric layer 300 may be limited, but the piezoelectric layer 300 is cut in all and the elastic layer 400 is formed. By forming this, flexible characteristics can be improved to the extent that the piezoelectric layer 300 can be rolled up. Of course, the elastic layer 400 may be formed to fill the cutout 330 formed at a part thickness as shown in FIGS. 4 to 6 without forming the cutout 330 in the entire thickness of the piezoelectric layer 300. It may be.
  • FIGS. 9 and 10 are schematic top views of first and second electrode layers according to other embodiments.
  • the pressure sensor according to the fourth embodiment of the present invention is provided between the first and second electrode layers 100 and 200 spaced apart from each other, and the first and second electrode layers 100 and 200. And a piezoelectric layer 300 having a plurality of plate-shaped piezoelectric bodies 310 having a predetermined thickness.
  • the first and second electrode layers 100 and 200 are formed on the first and second support layers 110 and 210 and the first and second support layers 110 and 210, respectively, to face each other. It may include electrodes 120 and 220. That is, the pressure sensor according to the fourth embodiment has the same configuration as the pressure sensor according to the first embodiment described with reference to FIG. 1.
  • the first and second electrodes 120 and 220 may be entirely formed on the first and second support layers 110 and 210 as shown in FIG. 9. That is, although the first and second electrodes 120 and 220 may be formed to have a predetermined pattern as shown in FIGS. 2 and 3, the first and second electrodes 120 and 220 may be formed entirely on the support layers 110 and 210 as shown in FIG. 9. It may be formed.
  • the first and second electrode layers 100 and 200 having such a shape may be applied to a pressure sensor provided to detect pressure in a local region. That is, in order to detect pressure in a plurality of areas of the electronic device using one pressure sensor, the electrodes 120 and 220 formed in a predetermined pattern as shown in FIGS. 2 and 3 may be used, and the local area may be used. In order to detect a pressure in the electrode, the electrodes 120 and 220 formed entirely on the support layers 110 and 210 as shown in FIG. 9 may be used.
  • the piezoelectric layer 300 may be formed in a shape as shown in FIGS. 4 to 7. That is, a predetermined cutout 330 may be formed in the piezoelectric layer 300 as shown in FIGS. 4 to 6, and the elastic layer 400 may be formed in the cutout 330 as shown in FIG. 7. It may be formed.
  • openings 130 and 230 may be formed in a predetermined region. That is, as shown in FIG. 10, the first and second electrode layers 100 and 200 are formed in a predetermined shape, and the openings 130 and 230 are formed in predetermined regions of the first and second electrode layers 100 and 200. Can be formed.
  • the openings 130, 230 may be provided so that another pressure sensor or a functional part having a function different from that of the pressure sensor may be inserted.
  • an opening overlapping the openings formed in the first and second electrode layers 100 and 200 may be formed in the piezoelectric layer 300.
  • the first and second electrode layers 100 and 200 may be formed in different shapes. That is, as shown in FIG.
  • the first electrode 120 is entirely formed on the first support layer 110
  • the second electrode layer 200 is formed of the second electrode 220.
  • 2 may be provided on the support layer 210 spaced apart at predetermined intervals.
  • the second electrode 210 may have a substantially rectangular first region 210a, substantially rectangular second and third regions 220b and 220c formed with an opening 230 therebetween,
  • the fourth region 220d formed in a quadrangular shape may be formed to be spaced apart by a predetermined interval.
  • a first connection pattern 140 may be formed on the first support layer 110
  • a second connection pattern 240 may be formed on the second support layer 210.
  • the first connection pattern 140 is formed in contact with the first electrode 110, and the second connection pattern 240 is formed to be spaced apart from the fourth region 220d.
  • the first and second connection patterns 140 and 240 may be formed to at least partially overlap.
  • a third connection pattern may be formed between the first and second connection patterns 140 and 240 in at least a portion of the piezoelectric layer 300 between the first and second electrode layers 100 and 200. have. That is, the third connection pattern may be formed to be spaced apart from the piezoelectric layer 300. Therefore, the first and second connection patterns 140 and 240 may be connected through the third connection pattern.
  • the second electrode layer 200 may extend from the first to fourth regions 210a to 210d to form first to fourth extension patterns 250a, 250b, 250c, and 250d, respectively, and a second connection pattern.
  • the fifth extension pattern 250e may be formed to extend from the 240.
  • the first to fifth extension patterns 250a to 250d may extend with a connector (not shown) to be connected to the control unit or the power supply unit.
  • a predetermined power source for example, a ground power source, may be applied to the first connection pattern 140 through the fifth extension pattern 250e, the second connection pattern 240, and the third connection pattern.
  • the power sensed by the first to fourth regions 220a to 220d may be transmitted to the connector through the first to fourth extension patterns 250a to 250d.
  • a predetermined power source for example a driving power source, may be applied to the first to fourth regions 220a and 220d through the first to fourth extension patterns 250a to 250d.
  • the pressure sensor according to the embodiments may be provided in an electronic device such as a smart phone to detect a user's touch or pressure.
  • an electronic device such as a smart phone to detect a user's touch or pressure.
  • FIGS. 11 and 12 are front and rear perspective views of an electronic device including a pressure sensor according to an embodiment of the present invention
  • FIG. 13 is a partial cross-sectional view taken along the line AA ′ of FIG. 11.
  • an embodiment of the present invention will be described by taking a mobile terminal including a smart phone as an electronic device having a pressure sensor as an example, and FIGS. 11 to 13 schematically illustrate main parts related to the present invention.
  • the electronic apparatus 1000 includes a case 1100 forming an appearance, and includes a plurality of functional modules for performing a plurality of functions of the electronic apparatus 1000 in the case 1100.
  • a circuit or the like is provided.
  • the case 1100 may include a front case 1110, a rear case 1120, and a battery cover 1130.
  • the front case 1110 may form part of the upper side and the side of the electronic device 1000
  • the rear case 1120 may form part of the side surface and the bottom of the electronic device 1000. That is, at least a portion of the front case 1110 and at least a portion of the rear case 1120 may form a side surface of the electronic device 1000, and a portion of the front case 1110 may be part of the upper surface except for the display unit 1310.
  • the battery cover 1130 may be provided to cover the battery 1200 provided on the rear case 1120.
  • the battery cover 1130 may be provided integrally or detachably provided. That is, when the battery 1200 is integrated, the battery cover 1130 may be integrally formed. When the battery 1200 is detachable, the battery cover 1130 may also be detachable.
  • the front case 1110 and the rear case 1120 may be integrally manufactured. That is, the case 1100 is formed to close the side and the rear surface and expose the top surface without distinguishing the front case 1110 and the rear case 1120, and the battery cover 1130 to cover the back of the case 1100. It may be arranged.
  • At least a part of the case 1100 may be formed by injecting synthetic resin or formed of a metal material. That is, at least a part of the front case 1110 and the rear case 1120 may be formed of a metal material, for example, a part of the side surface of the electronic device 1000 may be formed of a metal material. Of course, the battery cover 1130 may also be formed of a metal material.
  • the metal material used for the case 1100 may include, for example, stainless steel (STS), titanium (Ti), aluminum (Al), or the like. Meanwhile, various parts, such as a display unit such as a liquid crystal display, a pressure sensor, a circuit board, and a haptic device, may be embedded in the space formed between the front case 1110 and the rear case 1120.
  • the front case 1110 may include a display 1310, a sound output module 1320, a camera module 1330a, and the like.
  • a microphone 1340, an interface 1350, and the like may be disposed at one side of the front case 1110 and the rear case 1120. That is, the display unit 1310, the sound output module 1320, the camera module 1330a, and the like are disposed on the upper surface of the electronic device 1000, and the microphone 1340 is disposed on one side, that is, the lower side, of the electronic device 1000.
  • the interface 1350 may be disposed.
  • the display unit 1310 is disposed on the upper surface of the electronic device 1000 and occupies most of the upper surface of the front case 1110.
  • the display unit 1310 is provided in a substantially rectangular shape having a predetermined length in the X and Y directions, respectively, and includes the central area of the upper surface of the electronic apparatus 1000 in most regions of the upper surface of the electronic apparatus 1000. Is formed. In this case, a predetermined space that is not occupied by the display unit 1310 is provided between the outside of the electronic apparatus 1000, that is, the outside of the front case 1110 and the display unit 1310, and the display unit 1310 in the X direction.
  • An audio output module 1320 and a camera module 1330a may be provided at an upper side thereof, and a user input unit including a front input unit 1360 may be provided at a lower side thereof.
  • a bezel area may be provided between two edges of the display unit 1310 extending in the X direction and the edge of the electronic device 1000, that is, between the edge of the display unit 1310 and the electronic device 1000 in the Y direction. have.
  • the display unit 1310 may be extended to the edge of the electronic device 1000 in the Y direction without a separate bezel area.
  • the display unit 1310 may output visual information and input tactile information of the user.
  • the display unit 1310 may be provided with a touch input device.
  • the touch input device may include a window 2100 covering the front surface of the terminal body, a display unit 2200 for outputting start information, for example, a liquid crystal display, and a user's touch or pressure information. It may include a first pressure sensor 2300 according to at least one of them.
  • the touch input device may further include a touch sensor provided between the window 2100 and the display unit 2200. That is, the touch input device may include a touch sensor and a first pressure sensor 2300.
  • the touch sensor may be formed, for example, on a transparent plate having a predetermined thickness with a plurality of electrodes spaced apart by a predetermined interval in one direction and another direction perpendicular thereto, and a dielectric layer disposed therebetween to detect a user's touch input. That is, the touch sensor may include a plurality of electrodes arranged in a grid shape, for example, and detect capacitance according to a distance between electrodes according to a user's touch input.
  • the touch sensor detects coordinates in the horizontal direction, ie, the X direction and the Y direction, which are touched by the user, and the first pressure sensor 2300 is not only the X and Y directions but also the vertical direction, that is, the coordinates in the Z direction.
  • the touch sensor and the first pressure sensor 2300 may simultaneously detect coordinates in the X direction and the Y direction, and the first pressure sensor 2300 may further detect the coordinates in the Z direction. As such, the touch sensor and the first pressure sensor 2300 simultaneously detect the horizontal coordinates, and the first pressure sensor 2300 detects the vertical coordinates, thereby more accurately detecting the user's touch coordinates.
  • the sound output module 1320, the camera module 1330a, the front input unit 1360, and the like may be provided in an area other than the display unit 1310 on the upper surface of the front case 1110.
  • the sound output module 1320 and the camera module 1330a are provided above the display unit 1310 in the X direction, and a user input unit such as the front input unit 1360 is positioned below the display unit 1310 in the X direction.
  • the front input unit 1360 may be configured as a touch key, a push key, or the like, and the front input unit 1350 may be configured by using a touch sensor or a pressure sensor.
  • a function module 3000 for a function of the front input unit 1360 may be provided inside the case 1100 under the front input unit 1360 in the lower side of the front input unit 1360, that is, in the Z direction. That is, a function module that performs a function of a touch key or a push key may be provided according to the driving method of the front input unit 1360, and a touch sensor or a pressure sensor may be provided.
  • the front input unit 1360 may include a fingerprint recognition sensor. That is, the front input unit 1360 may recognize the user's fingerprint and detect whether the user is a legitimate user.
  • the function module 3000 may include a fingerprint recognition sensor.
  • the second pressure sensor 2400 may be provided at one side and the other side of the front input unit 1360 in the Y direction. Since the second pressure sensor 2400 is provided at both sides of the front input unit 1360 as a user input unit, a function of detecting a user's touch input and returning to a previous screen and setting a screen of the display unit 1310 may be performed. . In this case, the front input unit 1360 using the fingerprint sensor may perform a function of returning to the initial screen as well as fingerprint recognition of the user.
  • the haptic feedback device such as a piezoelectric vibration device, may be further provided in contact with the display unit 1310 to provide feedback in response to a user's input or touch.
  • the haptic feedback device may be provided in a predetermined area of the electronic device 1000 other than the display unit 1310.
  • a haptic feedback device may be provided in an outer region of the sound output module 1310, an outer region of the front input unit 1360, and a bezel region.
  • the haptic feedback device may be provided under the display unit 1310.
  • a power supply unit and a side input unit may be further provided.
  • the power supply unit and the side input unit may be provided on two sides facing each other in the Y direction of the electronic device, or may be provided spaced apart from each other on one side.
  • the power supply unit may be used to turn on / off the electronic device, and may be used to enable or disable the screen.
  • the side input unit may be used to adjust the size of the sound output from the sound output module 1320.
  • the power supply unit and the side input unit may be configured as a touch key, a push key, or may be configured as a pressure sensor.
  • the electronic device according to the present invention may be provided with a pressure sensor in a plurality of areas other than the display unit 1310, respectively.
  • a pressure sensor for example, pressure sensing of the upper sound output module 1320 and the camera module 1330a of the electronic device, pressure control of the lower front input unit 1360, and controlling pressure of the side power supply unit and side input unit, etc.
  • At least one pressure sensor may be further provided.
  • a camera module 1330b may be additionally mounted on the rear surface of the electronic apparatus 1000, that is, the rear case 1120.
  • the camera module 1330b has a photographing direction substantially opposite to the camera module 1330a and may be a camera having different pixels from the camera module 1330a.
  • a flash (not shown) may be further disposed adjacent to the camera module 1330b.
  • a fingerprint sensor may be provided below the camera module 1330b. That is, the fingerprint sensor may not be provided at the front input unit 1360, but a fingerprint sensor may be provided at the rear of the electronic device 1000.
  • the battery 1200 may be provided between the rear case 1120 and the battery cover 1300, may be fixed, or may be detachably provided.
  • the rear case 1120 may have a concave region formed to provide an area into which the battery 1200 is inserted, and after the battery 1200 is mounted, the battery cover 1130 may cover the battery 1200 and the rear case. It may be provided to cover the 1120.
  • a bracket 1370 is provided between the display unit 1310 and the rear case 1130 inside the electronic device 1000, and the window 2100 and the display unit (above the bracket 1370) are provided. 2200 and pressure sensor 2300 may be provided. That is, the touch input device according to the present invention may be provided above the bracket 1370 of the display unit 1310, and the bracket 1370 supports the touch input device.
  • the bracket 1370 may be extended to an area other than the display unit 1310. That is, as illustrated in FIG. 13, the bracket 1370 may be extended to a region where the front input unit 1360 and the like are formed. In addition, at least a portion of the bracket 1370 may be supported by at least a portion of the front case 1110.
  • the bracket 1370 extended to the outside of the display unit 1310 may be supported by an extension that extends from the front case 1110.
  • a partition wall having a predetermined height may be formed on the bracket 1370 of the boundary area between the display unit 1310 and the outside thereof.
  • the bracket 1370 supports the function module 3000 such as the pressure sensor 2400 and the fingerprint recognition sensor.
  • at least one for supplying power to a function module 3000 such as pressure sensors 2300 and 2400, a fingerprint recognition sensor, and a touch sensor on the bracket 1370, and inputting and detecting signals outputted from them.
  • a printed circuit board (PCB) or a flexible printed circuit board (FPCB) provided with a driving means may be provided.
  • At least one pressure sensor may be provided in a predetermined region in the electronic device.
  • the display unit 1310 and the user input unit may be provided respectively, or any one may be provided.
  • at least one pressure sensor may be provided in a predetermined region in the electronic device.
  • various embodiments of the electronic device according to the present invention, in which a pressure sensor may be provided in a plurality of regions, are as follows.
  • FIG. 14 is a cross-sectional view of an electronic device according to a second embodiment of the present disclosure, which is a cross-sectional view of a touch input device provided in the display unit 1310.
  • the electronic device includes a window 2100, a display unit 2200, a pressure sensor 2300, and a bracket 1370.
  • the window 2100 is provided above the display unit 2200 and supported by at least a portion of the front case 1310. In addition, the window 2100 forms an upper surface of the electronic device and contacts an object such as a finger or a stylus pen.
  • the window 2100 may be made of a transparent material, for example, may be made of acrylic resin, glass, or the like.
  • the window 2100 may be formed on the upper surface of the electronic device 1000 outside the display unit 1310 as well as the display unit 1310. That is, the window 2100 may be formed to cover the top surface of the electronic device 1000.
  • the display unit 2200 displays an image to the user through the window 2100.
  • the display unit 2200 may include a liquid crystal display (LCD) panel, an organic light emitting display (OLED) panel, and the like.
  • a backlight unit (not shown) may be provided below the display unit 2200.
  • the backlight unit may include a reflective sheet, a light guide plate, an optical sheet, and a light source.
  • the light source may be a light emitting diode (LED). In this case, the light source may be provided below the optical structure on which the reflective sheet, the light guide plate, and the optical sheet are stacked, or may be provided on the side surface.
  • the liquid crystal material of the liquid crystal display panel outputs a character or an image according to an input signal in response to the light source of the backlight unit.
  • a light blocking tape is attached between the display unit 2200 and the backlight unit to block light leakage.
  • the light blocking tape may be formed in a form in which an adhesive is applied to both sides of the polyethylene film.
  • the display unit 2200 and the backlight unit are adhered to the adhesive of the light blocking tape, and the light of the backlight unit is not leaked to the outside of the display unit 2200 by the polyethylene film inserted into the light blocking tape.
  • the pressure sensor 2300 may be provided below the backlight unit, or may be provided between the display unit 2200 and the backlight unit.
  • the pressure sensor 2300 may include the first and second electrode layers 100 and 200, and the piezoelectric layer 300 provided between the first and second electrode layers 100 and 200.
  • the first and second electrode layers 100 and 200 are formed on the first and second support layers 110 and 210 and the first and second support layers 110 and 210, respectively, and will be described with reference to FIGS. 1 to 9.
  • the first and second electrodes 120 and 220 may have at least one of the shapes. In this case, the first and second electrodes 120 and 220 may be provided to face each other with the piezoelectric layer 300 interposed therebetween. However, the first and second electrodes 120 and 220 may be formed such that one of the first and second electrodes 120 and 220 faces the piezoelectric layer 300 and the other does not face the piezoelectric layer 300.
  • the first electrode layer 100 is formed so that the first electrode 120 is formed below the first support layer 110 so that the first electrode 120 does not face the piezoelectric layer 300, and the second electrode layer ( The second electrode 220 may be formed below the second support layer 210 so that the second electrode 220 faces the piezoelectric layer 300.
  • the first electrode 120, the first support layer 110, the piezoelectric layer 300, the second electrode 220, and the second support layer 210 may be formed in the order from the lower side to the upper side.
  • the pressure sensor 2300 may have adhesive layers 410, 420 and 400 formed on the lowermost layer and the uppermost layer. The adhesive layers 410 and 420 may be provided to adhesively fix the pressure sensor 2300 between the display unit 2200 and the bracket 1370.
  • the adhesive layers 410 and 420 may use double-sided adhesive tape, adhesive tape, adhesive, or the like.
  • a first insulating layer 510 is provided between the first electrode layer 100 and the adhesive layer 410
  • a second insulating layer 520 is provided between the piezoelectric layer 300 and the second electrode 220.
  • the insulating layers 510, 520 and 500 may be formed using a material having elasticity and restoring force.
  • the insulating layers 510 and 520 may be formed using silicon, rubber, gel, teflon tape, or urethane having a hardness of 30 or less.
  • a plurality of pores may be formed in the insulating layers 510 and 520.
  • the pores have a size of, for example, 1 ⁇ m to 500 ⁇ m and may be formed at a porosity of 10% to 95%.
  • the elastic force and the restoring force of the insulating layers 510 and 520 may be further improved.
  • the first and second support layers 110 and 210 are formed to have a thickness of 50 ⁇ m to 150 ⁇ m, respectively, and the first and second electrodes 120 and 220 are each formed to have a thickness of 1 ⁇ m to 50 ⁇ m
  • the piezoelectric layer 300 may be formed to a thickness of 10 ⁇ m to 1000 ⁇ m.
  • the piezoelectric layer 300 may be formed to be the same or thicker than the first and second electrode layers 100 and 200, and the first and second electrode layers 100 and 200 may be formed to have the same thickness.
  • the first and second electrode layers 100 and 200 may be formed to have different thicknesses depending on the material.
  • the second electrode layer 200 may be formed to be thinner than the first electrode layer 100.
  • the first and second insulating layers 510 and 520 may each have a thickness of 3 ⁇ m to 500 ⁇ m
  • the first and second adhesive layers 410 and 420 may each have a thickness of 3 ⁇ m to 1000 ⁇ m. Can be.
  • the first and second insulating layers 510 and 520 may have the same thickness, and the first and second adhesive layers 410 and 420 may have the same thickness.
  • the insulating layers 510 and 520 may be formed in different thicknesses, and the adhesive layers 410 and 420 may be formed in different thicknesses.
  • the first adhesive layer 410 may be thicker than the second adhesive layer 420. Can be formed.
  • the bracket 1370 is provided above the rear case 1120 as shown in FIG. 13.
  • the bracket 1370 supports the upper touch sensor, the display unit 2200 and the pressure sensor 2300 and prevents the pressing force of the object from being distributed.
  • the bracket 1370 may be formed of a material whose shape is not deformed. That is, the bracket 1370 may be formed of a material such that the pressing force of the object is not dispersed and the touch sensor, the display unit 2200, and the pressure sensor 2300 are not deformed by pressure.
  • the bracket 1370 may be formed of a conductive material or an insulating material.
  • the bracket 1370 may be formed in a corner or whole bent structure, that is, bent structure. As the bracket 1370 is provided, the pressing force of the object may be concentrated without being distributed, and thus the touch area may be detected more accurately.
  • the pressure sensor may be formed in the entire area under the display unit 2200, or may be formed in at least a partial area under the display unit 2200.
  • the arrangement of such a pressure sensor is shown in FIG. 15.
  • FIG. 15 is a plan view schematically illustrating an arrangement shape of a pressure sensor of an electronic device according to a second embodiment of the present disclosure, and illustrates an arrangement shape of the pressure sensor 2300 based on the display unit 2200.
  • the pressure sensor 2300 may be provided along an edge of the display unit 2200.
  • the pressure sensor 2300 may be provided at a predetermined width from an edge, that is, an edge of the display unit 2200 having a substantially rectangular shape, and provided at a predetermined length. That is, the pressure sensor 2300 having a predetermined width may be provided along two long sides of the display unit 2200, and the pressure sensor 2300 having a predetermined width may be provided along two short sides. Accordingly, four pressure sensors 2300 may be provided along the edge of the display unit 2200, and one pressure sensor 2300 may be provided along the shape of the edge of the display unit 2200.
  • the pressure sensor 2300 may be provided in the remaining area except a predetermined width of the edge of the display unit 2200.
  • the pressure sensor 2300 may be provided in a region where two adjacent sides of the display unit 2200 meet, that is, a vertex region. That is, the pressure sensor 2300 may be provided at four corner regions of the display unit 2200.
  • the pressure sensor 2300 is provided in the remaining area except the edge area of the display unit 2200, and the filling material such as a double-sided tape is provided in the remaining area in which the pressure sensor 2300 is not provided. 2310 may be provided.
  • a plurality of pressure sensors 2300 may be provided at substantially equal intervals below the display unit 2200.
  • the filler 2310 such as a double-sided tape may be provided in an area where the pressure sensor 2300 is not provided in FIGS. 15A, 15C and 15D.
  • any one of the first and second electrode layers 100 and 200 of the present invention may be implemented on the bracket 1370. That is, the bracket 1370 may function as the first and second electrode layers 100 and 200. In this case, the first electrode 120 or the second electrode 220 may be formed on the bracket 1370. Therefore, the bracket 1370 may be used as the support layer of the first electrode layer 100 or the second electrode layer 200.
  • 16 illustrates an electronic device including a pressure sensor according to a third embodiment of the present invention. FIG. 16 illustrates a case where the first electrode 120 is formed on the bracket 1370. In this case, although not shown, a touch sensor may be further provided between the window 2100 and the display unit 2200.
  • the bracket 1370 may be used as the first electrode layer. That is, the bracket 1370 may be used as a ground electrode.
  • the bracket 1370 may be formed of an insulating material and the first electrode 120 may be formed in the bracket 1370.
  • the first electrode 120 may be arranged in one direction to have a predetermined width and spacing, or may be formed in a predetermined pattern.
  • the first electrode 120 may be entirely formed on the bracket 1370. In this case, the first electrode 120 on the bracket 1370 is formed to at least partially overlap the second electrode 220 of the second electrode layer 200.
  • the first and second electrodes 120 and 220 may overlap each other to generate power, for example, from the piezoelectric layer 300 between the first electrode 120 and the second electrode 220.
  • at least a portion of the second electrode 220 may provide pressure to at least a portion of the piezoelectric layer 300 according to a user's touch or application of pressure, thereby generating power from the piezoelectric layer 300 provided with pressure.
  • the first electrode 120 formed on the bracket 1370 may be formed of a transparent conductive material.
  • the first electrode 120 may be formed of an opaque conductive material such as copper, silver, and gold.
  • the bracket 1370 may be applied with a ground potential through the first electrode 120.
  • a signal having a predetermined potential may be applied through the second electrode layer 200, and a ground potential may be applied through the bracket 1370. Accordingly, the distance between the second electrode layer 200 and the bracket 1370 is closer to the reference distance in response to the touch of the object, and accordingly, the distance between the second electrode layer 200 and the bracket 1370 is predetermined in the piezoelectric layer 300 between the second electrode layer 200 and the bracket 1370. Power may be generated.
  • the embodiments of the present invention described the case where the pressure sensor 2300 is provided between the display unit 2200 and the bracket 1370.
  • the pressure sensor 2300 may be provided between the window 2100 and the display unit 2200, or may be provided between the display unit 2200 and the backlight unit.
  • FIG. 17 is a plan view schematically illustrating an arrangement shape of a pressure sensor of an electronic device according to a fourth embodiment of the present disclosure, and illustrates an arrangement shape of the pressure sensor 2400 based on the window 2100.
  • the pressure sensor 2400 may be provided along an edge of the window 2100.
  • the pressure sensor 2400 may be provided at a predetermined width from an edge of the substantially rectangular window 2100, that is, an edge, and may be provided at a predetermined length. That is, the pressure sensor 2400 of a predetermined width may be provided along two long sides of the window 2100, and the pressure sensor 2400 of a predetermined width may be provided along two short sides.
  • the pressure sensor 2400 may be provided in an area other than the display unit 1310, that is, the upper and lower regions of the display unit 1310 and the bezel region. In this case, four pressure sensors 2400 may be provided along the edge of the window 2100, and one may be provided along the shape of the edge of the window 2100.
  • the pressure sensor 2400 may be provided along the long edge of the window 2100. That is, the pressure sensor 2400 may be provided in an area between the edge of the display unit 1310 and the edge of the electronic device 1000, that is, the bezel area.
  • the pressure sensor 2400 may be provided in a region where two adjacent sides of the window 2100 meet, that is, a vertex region. That is, the pressure sensor 2400 may be provided at four corner regions of the window 2100.
  • the pressure sensor 2400 may be provided along the short side edge of the window 2100.
  • a plurality of pressure sensors 2400 may be provided at predetermined intervals along the long side and short side edges of the window 2100.
  • the plurality of pressure sensors 2400 may be provided at approximately equal intervals.
  • pressure sensors 2400 are provided at four corner regions of the window 2100, respectively, and the area between the pressure sensors 2400, that is, the long side and short side edges of the window 2100.
  • the region may be provided with a filler 2410 such as an adhesive tape.
  • 18 is a control configuration diagram of a pressure sensor according to an embodiment of the present disclosure, and is a control configuration diagram of a pressure sensor including first and second pressure sensors 2300 and 2400.
  • a control configuration of a pressure sensor includes a controller 2500 for controlling at least one driving of the first pressure sensor 2300 and the second pressure sensor 2400. can do.
  • the controller 2500 may include a driver 2510, a detector 2520, a converter 2530, and a calculator 2540.
  • the controller 2500 including the driver 2510, the detector 2520, the converter 2530, and the calculator 2540 may be implemented as one integrated circuit (IC). Accordingly, the output of the at least one pressure sensor 2300 and 2400 may be processed using one integrated circuit IC.
  • the driver 2510 applies a driving signal to at least one pressure sensor 2300 and 2400. That is, the driver 2510 may apply a driving signal to the first pressure sensor 2300 and the second pressure sensor 2400 or may apply a driving signal to the first pressure sensor 2300 or the second pressure sensor 2400. Can be. To this end, the driver 2510 may include a first driver for driving the first pressure sensor 2300 and a second driver for driving the second pressure sensor 2400. However, the driving unit 2510 may be configured as one to apply driving signals to the first and second pressure sensors 2300 and 2400. That is, one driving unit 2510 may apply driving signals to the first and second pressure sensors 2300 and 2400, respectively.
  • the driving unit 2510 may apply a driving signal to the plurality of pressure sensors 2300 and 2400.
  • the driving signal from the driver 2510 may be applied to any one of the first and second electrodes 120 and 220 constituting the first and second pressure sensors 2300 and 2400.
  • the driver 2510 may apply a ground voltage to the first electrode 120, for example.
  • the driver 2510 may apply a predetermined driving signal to the second electrode 220.
  • the driving signals applied to the first and second pressure sensors 2300 and 2400 may be identical to each other or may be different from each other.
  • the driving signal may be a square wave, a sine wave, a triangle wave, or the like having a predetermined period and amplitude, and may be sequentially applied to each of the plurality of first electrodes 220.
  • the driver 2510 may simultaneously apply a driving signal to the plurality of first electrodes 220 or selectively apply only a portion of the plurality of first electrodes 220 to the driving signal.
  • the detector 2520 detects output signals of the pressure sensors 2300 and 2400. For example, when a ground potential is applied to the first electrode 120 and a pressure is applied to the piezoelectric layer 300 from at least one region of the second electrode 220 by a user's touch, the piezoelectric layer 300 of the corresponding region is applied. From the predetermined power is generated. Accordingly, the detector 2520 detects a pressure by detecting power output from a predetermined region of the pressure sensors 2300 and 2400, for example, the second electrode 220 or the piezoelectric layer 300.
  • the detector 2520 may include first and second detectors for detecting power of the first and second pressure sensors 2300 and 2400, respectively.
  • one detector 2520 may detect the power of both the first and second pressure sensors 2300 and 2400, and for this purpose, the detector 2520 may be configured to detect the power of the first and second pressure sensors 2300 and 2400. Power can be detected sequentially. In this way, the detector 2520 may detect the power of the pressure sensors 2300 and 2400 to detect the touched region and the pressure of the region. For example, when a user touches with a finger, there may be a center region where the center of the finger is in contact so that the pressure is most transmitted, and a peripheral region where less pressure is transmitted around the center region.
  • the touch pressure of the user is most transmitted, and accordingly, the pressure applied to the piezoelectric layer 300 is large, and the peripheral region is output from the center region because the pressure applied to the piezoelectric layer 300 is smaller than that of the center region.
  • Power is greater than the surrounding area. Therefore, by detecting and comparing the power output from the plurality of areas, it is possible to detect the center area where the pressure is most transmitted and the peripheral area where the pressure is less than that, and as a result, the area the user wants to touch as the center area. Judgment can be detected.
  • the area that the user does not touch may output power lower than the peripheral area or may not output power.
  • the detector 2520 may include a plurality of CV converters (not shown) each having at least one operational amplifier and at least one capacitor, and the plurality of CV converters may include first and second pressure sensors 2300. And a plurality of second electrodes 220 of 2400.
  • the plurality of C-V converters may convert an analog signal and output the analog signal.
  • each of the plurality of C-V converters may include an integration circuit.
  • the converter 2530 converts the analog signal output from the detector 2520 into a digital signal to generate a detection signal. For example, the converter 2530 measures a time at which the analog signal output from the detector 2520 reaches a predetermined reference level and converts it into a detection signal that is a digital signal. Or it may include an analog-to-digital converter (ADC) circuit for measuring the amount of change in the level of the analog signal output from the detector 2520 for a predetermined time and converts it to a detection signal which is a digital signal.
  • ADC analog-to-digital converter
  • the calculator 2540 determines contact inputs applied to the first and second pressure sensors 2300 and 2400 using the detection signal.
  • the number, coordinates, and pressure of the touch inputs applied to the first and second pressure sensors 2300 and 2400 may be determined using the detection signal.
  • the detection signal on which the calculator 2540 determines the touch input may be data obtained by quantifying a change in power output from the piezoelectric layer 300. In particular, when the touch input does not occur and the touch input occurs, the detection signal may be numeric. It may be data representing a difference in power.
  • the touch input of the first and second pressure sensors 2300 and 2400 may be determined using the controller 2500, and the touch input may be transmitted to, for example, the main controller of the host 4000 such as an electronic device. That is, the controller 2500 uses the detector 2520, the converter 2530, the calculator 2540, and the like to obtain X, Y coordinate data and Z pressure data using signals input from the pressure sensors 2300 and 2400. Create The generated X, Y coordinate data and Z pressure data are transferred to the host 4000, and the host 4000 touches the corresponding part using the X, Y coordinate data and the Z pressure data using, for example, the main controller. And pressure.
  • the controller 2500 may include a first controller 2500a that processes the output of the first pressure sensor 2300 and a second controller 2500b that processes the output of the second pressure sensor 2400. . That is, although FIG. 18 has described one control unit 2500 that processes the outputs of the first and second pressure sensors 2300 and 2400, the control unit 2500 may have the first and second pressures as shown in FIG. 19. The first and second controllers 2500a and 2500b may respectively process the outputs of the sensors 2300 and 2400.
  • the first controller 2500a may include a first driver 2510a, a first detector 2520a, a first converter 2530a, and a first calculator 2540a
  • the second controller 2500b may include The second driver 2510b, the second detector 2520b, the second converter 2530b, and the second calculator 2540b may be included.
  • the first and second controllers 2500a and 2500b may be implemented in different integrated circuits IC, respectively. Thus, two integrated circuits may be needed to process the outputs of the first and second pressure sensors 2300 and 2400. However, the first and second controllers 2500a and 2500b may be implemented in one integrated circuit IC, respectively.
  • first and second control units 2500a and 2500b are the same as those described above with reference to FIG. 18 by dividing the outputs of the first and second pressure sensors 2300 and 2400, respectively, and thus, detailed descriptions thereof will be omitted. Shall be.
  • the electronic device may further include a touch sensor in addition to at least one of the first and second pressure sensors 2300 and 2400.
  • the driving of the touch sensor may be performed by one controller 2500 as shown in FIG. 20. That is, one controller 2500 may control at least one of the first and second pressure sensors 2300 and 2400 and the touch sensor 5000.
  • the touch sensor 5000 is further provided, as shown in FIG. 21, the third and second controllers 2500a and 2500b for controlling the first and second pressure sensors 2300 and 2400 may be added to the third sensor.
  • the controller 2500c may be further provided. That is, a plurality of controllers may be provided to control the first and second pressure sensors 2300 and 2400 and the touch sensor 5000, respectively.
  • FIG. 22 is a block diagram illustrating a data processing method of a pressure sensor according to another exemplary embodiment.
  • a first controller 2600, a storage 2700, and a second controller 2800 may be included to process data of a pressure sensor according to another exemplary embodiment.
  • Such a configuration may be configured in the same IC or may be configured in another IC.
  • the data processing of the present invention may be performed in conjunction with the first control unit 2600 and the second control unit 2800.
  • the first and second control units 2600 and 2800 may be for processing data of the pressure sensor, respectively.
  • any one of the first and second control units 2600 and 2800 (for example, the first control unit) is a control unit for controlling the touch sensor, and the other (for example, the second control unit) controls the pressure sensor. It may be a control unit for.
  • the controller for controlling the touch sensor may control the pressure sensor simultaneously with the control of the touch sensor.
  • the storage unit 2700 serves as a data movement path between the first control unit 2600 and the second control unit 2800 and also stores data of the first and second control units 2600 and 2800.
  • the first control unit 2600 scans the pressure sensor and stores raw data of the pressure sensor in the storage unit 2700.
  • the second controller 2800 inputs raw data from the storage 2700 to process the pressure sensor data, and stores the result value in the storage 2700.
  • the result value stored in the storage unit 2700 may include data such as a Z axis and a state.
  • the first controller 2600 reads the result of the pressure sensor from the storage 2700 and generates an interrupt when an event occurs and transmits the interrupt to the host.
  • the front input unit 1360 of the electronic apparatus 1000 may be a fingerprint sensor, and the fingerprint sensor may use the pressure sensor according to the present invention.
  • 23 is a block diagram of a fingerprint recognition sensor using a pressure sensor according to embodiments of the present invention.
  • 24 is a cross-sectional view of a pressure sensor according to another embodiment of the present invention.
  • a fingerprint recognition sensor using a pressure sensor includes a pressure sensor 2300 and a fingerprint detector 6000 electrically connected to the pressure sensor 2300 to detect a fingerprint. can do.
  • the fingerprint detector 6000 may include a signal generator 6100, a signal detector 6200, a calculator 6300, and the like.
  • the pressure sensor 2300 may further include a protective layer 500 as a protective coating on a surface on which a finger is placed, as shown in FIG. 24.
  • the protective layer 500 can be made of urethane or another plastic that can act as a protective coating.
  • the protective layer 500 is attached to the second electrode layer 200 using an adhesive.
  • the pressure sensor 100 may further include a support layer 600 that may be used as a support in the pressure sensor 1000.
  • the support layer 600 may be made of Teflon or the like. Of course, the support layer 600 may use other types of support materials instead of Teflon.
  • the support layer 600 may be attached to the first electrode layer 100 using an adhesive.
  • the piezoelectric layer 300 may be provided at predetermined intervals in one direction and the other direction by the cutout 330 as illustrated in FIG. 4, and illustrated in FIG. 7.
  • the elastic layer 400 may be formed in the cutout 3300. At this time, the elastic layer 400 is formed so that each vibration does not affect each other.
  • the fingerprint detector 6000 may be connected to the first and second electrodes 110 and 210 provided at upper and lower portions of the piezoelectric layer 300 of the pressure sensor 2300, respectively.
  • the fingerprint detector 6000 may generate an ultrasonic signal by applying a voltage having a resonance frequency of the ultrasonic band to the first and second electrodes 110 and 210 to vibrate the piezoelectric layer 300 up and down.
  • the signal generator 6100 is electrically connected to the plurality of first and second electrodes 110 and 210 included in the pressure sensor 2300, and applies an AC voltage having a predetermined frequency to each electrode.
  • an ultrasonic signal having a predetermined resonance frequency for example, 10 MHz, is emitted to the outside.
  • a specific object may be in contact with one surface of the pressure sensor 2300, for example, one surface of the protective layer 500.
  • the object in contact with one surface of the protective layer 500 is a finger of a person including a fingerprint
  • the pattern is determined differently. Assuming that no object is in contact with a contact surface such as one surface of the protective layer 500, almost all ultrasonic signals generated by the pressure sensor 2300 pass through the contact surface due to the difference between the contact surface and the air medium. I can't do it and come back.
  • the signal detector 6200 measures the difference in acoustic impedance generated by the ultrasonic signal in the valley and the ridge of the fingerprint from the pressure sensor 2300 so that the corresponding area is in contact with the ridge of the fingerprint. It may be determined whether the sensor is a sensor.
  • the calculator 6300 calculates a fingerprint pattern by analyzing a signal detected by the signal detector 6200.
  • the pressure sensor 2300 generated with a low intensity of the reflected signal is a pressure sensor 2300 abutting the ridge of the fingerprint, and generated with a high intensity of the reflected signal-ideally approximately equal to the intensity of the output ultrasonic signal.
  • the pressure sensor 2300 is a pressure sensor 2300 corresponding to a valley of the fingerprint. Therefore, the fingerprint pattern may be calculated from the difference in acoustic impedance detected in each area of the pressure sensor 2300.

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Abstract

The present invention provides an electronic device having a pressure sensor, the electronic device comprising: a window; a display unit for displaying an image through the window; and a pressure sensor for detecting the location and the pressure of a touch input that is applied through the window, wherein the pressure sensor includes a first and a second electrode layer arranged spaced apart from one another, and a piezoelectric layer arranged between the first and the second electrode layer, and the piezoelectric layer includes a plurality of piezoelectric bodies having a plate shape arranged in a polymer or a plurality of cut parts formed having a predetermined width and depth on the piezoelectric layer.

Description

압력 센서를 구비하는 전자기기Electronic device with pressure sensor
본 발명은 전자기기에 관한 것으로, 특히 사용자의 터치에 의해 소정의 기능을 수행하며 터치 입력 오류를 방지할 수 있는 압력 센서를 구비하는 전자기기에 관한 것이다.The present invention relates to an electronic device, and more particularly, to an electronic device having a pressure sensor capable of performing a predetermined function by a user's touch and preventing a touch input error.
이동통신 단말기 등의 전자기기의 조작을 위해 다양한 종류의 입력 장치들이 이용되고 있다. 예를 들어, 버튼(button), 키(key) 및 터치 스크린 패널(touch screen panel) 등의 입력 장치가 이용되고 있다. 터치 스크린 패널, 즉 터치 센서는 인체의 접촉을 감지하여 가벼운 터치만으로 쉽고 간편하게 전자기기를 조작할 수 있으므로 이용이 증가하고 있다. 즉, 인체(손가락)나 펜과의 접촉 여부를 그 접촉에 따른 인체 전류의 감지나, 압력이나 온도 변화 등을 이용해서 감지하고 인식하는 기술 수단을 갖고 있다. 이러한 터치 입력 장치는 이동통신 단말기 뿐만 아니라 가전제품, 산업기기, 자동차 등의 조작을 위해서도 이용되고 있다.Various types of input devices are used for the operation of electronic devices such as mobile communication terminals. For example, input devices such as buttons, keys, and touch screen panels are used. The touch screen panel, that is, the touch sensor, detects the touch of the human body, and thus the use of the electronic device is easy and simple to operate with only a light touch. That is, there is a technical means for detecting and recognizing whether or not the contact with the human body (finger) or the pen using the detection of the human body current according to the contact, the pressure or the temperature change. Such touch input devices are used not only for mobile communication terminals but also for operations of home appliances, industrial devices, automobiles, and the like.
이동통신 단말기 등의 전자기기에 이용되는 터치 센서는 보호용 윈도우와 영상을 표시하는 액정표시패널 사이에 마련될 수 있다. 따라서, 문자나 기호 등이 액정표시패널로부터 윈도우를 통해 나타나고, 사용자가 해당 부분을 터치하게 되면 터치 센서가 그 위치를 파악하고 제어 흐름에 따라 특정 처리를 실시하게 된다.A touch sensor used in an electronic device such as a mobile communication terminal may be provided between a protective window and a liquid crystal display panel displaying an image. Therefore, when a character or a symbol is displayed through a window from the liquid crystal display panel, and the user touches the corresponding portion, the touch sensor detects the position and performs a specific process according to the control flow.
그런데, 터치 센서만을 이용하는 전자기기에서는 사용자의 터치 오류가 발생되어 원하지 않는 동작이 수행될 수 있다. 따라서, 터치 오류를 감소시키기 위해 터치 위치와 함께 터치 압력을 검출하는 방법에 대한 필요성이 대두되고 있다.However, in an electronic device using only a touch sensor, a user's touch error may occur and an unwanted operation may be performed. Thus, there is a need for a method of detecting touch pressure with touch position to reduce touch error.
(선행기술문헌)(Prior art document)
한국등록특허 제10-1094165호Korean Patent Registration No. 10-1094165
한국공개특허 제2014-0023440호Korean Patent Publication No. 2014-0023440
본 발명은 터치 입력의 오류를 방지할 수 있는 압력 센서를 구비하는 전자기기를 제공한다.The present invention provides an electronic device having a pressure sensor that can prevent the error of the touch input.
본 발명은 취성을 개선시킬 수 있는 압력 센서를 구비하는 전자기기를 제공한다.The present invention provides an electronic device having a pressure sensor that can improve brittleness.
본 발명의 일 양태에 따른 전자기기는 윈도우; 상기 윈도우를 통해 영상을 표시하는 표시부; 및 상기 윈도우를 통해 인가되는 터치 입력의 위치 및 압력을 검출하는 압력 센서를 포함하고, 상기 압력 센서는 서로 이격되어 마련된 제 1 및 제 2 전극층과, 상기 제 1 및 제 2 전극층 사이에 마련된 압전층을 포함하며, 상기 압전층은 폴리머 내에 복수 마련된 판 형상의 압전체를 포함한다.An electronic device according to an aspect of the present invention includes a window; A display unit which displays an image through the window; And a pressure sensor for detecting a position and a pressure of a touch input applied through the window, wherein the pressure sensor includes first and second electrode layers spaced apart from each other, and a piezoelectric layer provided between the first and second electrode layers. Wherein the piezoelectric layer includes a plate-like piezoelectric body provided in plural in the polymer.
상기 압전체는 수평 방향으로 서로 교차하는 일 방향 및 타 방향으로 복수 배열되고, 수직 방향으로 복수 배열된다.The piezoelectric bodies are arranged in plural in one direction and in other directions crossing each other in the horizontal direction, and plural in the vertical direction.
상기 압전체는 30% 내지 99%의 밀도로 마련된다.The piezoelectric body is provided at a density of 30% to 99%.
상기 압전체는 단결정을 포함한다.The piezoelectric body includes a single crystal.
상기 압전체는 페로브스카이트(perovskite) 결정 구조를 가지는 압전 물질로 형성되는 배향 원료 조성물과, 상기 배향 원료 조성물 내에 분포하며 ABO3(A는 2가의 금속 원소, B는 4가의 금속 원소)의 일반식을 가지는 산화물로 형성되는 시드 조성물을 포함한다.The piezoelectric body is an oriented raw material composition formed of a piezoelectric material having a perovskite crystal structure, and distributed in the oriented raw material composition, wherein ABO 3 (A is a divalent metal element and B is a tetravalent metal element) is generally used. A seed composition formed of an oxide having the formula.
본 발명의 다른 양태에 따른 전자기기는 윈도우; 상기 윈도우를 통해 영상을 표시하는 표시부; 및 상기 윈도우를 통해 인가되는 터치 입력의 위치 및 압력을 검출하는 압력 센서를 포함하고, 상기 압력 센서는 서로 이격되어 마련된 제 1 및 제 2 전극층과, 상기 제 1 및 제 2 전극층 사이에 마련된 압전층을 포함하며, 상기 압전층에 소정의 폭 및 깊이로 형성된 복수의 절개부를 포함한다.According to another aspect of the present invention, an electronic device includes a window; A display unit which displays an image through the window; And a pressure sensor for detecting a position and a pressure of a touch input applied through the window, wherein the pressure sensor includes first and second electrode layers spaced apart from each other, and a piezoelectric layer provided between the first and second electrode layers. It includes, and comprises a plurality of cutouts formed in the piezoelectric layer to a predetermined width and depth.
상기 절개부는 상기 압전층 두께의 50% 내지 100%의 깊이로 형성된다.The cutout is formed to a depth of 50% to 100% of the thickness of the piezoelectric layer.
상기 절개부 내에 마련된 탄성층을 더 포함한다.It further includes an elastic layer provided in the cutout.
상기 압전층은 단결정을 포함한다.The piezoelectric layer includes a single crystal.
상기 압전층은 페로브스카이트(perovskite) 결정 구조를 가지는 압전 물질로 형성되는 배향 원료 조성물과, 상기 배향 원료 조성물 내에 분포하며 ABO3(A는 2가의 금속 원소, B는 4가의 금속 원소)의 일반식을 가지는 산화물로 형성되는 시드 조성물을 포함한다.The piezoelectric layer is an orientation raw material composition formed of a piezoelectric material having a perovskite crystal structure, and distributed in the orientation raw material composition, wherein ABO 3 (A is a divalent metal element and B is a tetravalent metal element). A seed composition formed of an oxide having the general formula.
상기 압력 센서는 상기 표시부 하측에 마련된 적어도 하나의 제 1 압력 센서와, 상기 윈도우 하측에 마련된 적어도 하나의 제 2 압력 센서 중 적어도 어느 하나를 포함한다.The pressure sensor may include at least one of at least one first pressure sensor provided below the display unit and at least one second pressure sensor provided below the window.
상기 윈도우와 상기 표시부 사이에 마련된 터치 센서를 더 포함한다.The touch sensor may further include a touch sensor provided between the window and the display unit.
상기 제 1 전극층의 상측, 상기 제 1 및 제 2 전극층 사이, 그리고 상기 제 2 전극층의 하측 중 적어도 하나에 마련된 절연층을 더 포함한다.And an insulating layer provided on at least one of an upper side of the first electrode layer, between the first and second electrode layers, and a lower side of the second electrode layer.
상기 제 1 및 제 2 전극층 상에 각각 마련되며 서로 연결되는 제 1 및 제 2 연결 패턴을 더 포함한다.The apparatus may further include first and second connection patterns respectively provided on the first and second electrode layers and connected to each other.
본 발명의 전자기기는 윈도우, 표시부 및 압력 센서를 포함할 수 있고, 압력 센서는 표시부 하측 및 윈도우 하측 중 적어도 하나에 적어도 하나 이상 마련될 수 있다. 또한, 압력 센서는 서로 이격된 제 1 및 제 2 전극층 사이에 압전층이 형성되고, 압전층은 단결정의 판 형상의 압전체가 복수 마련될 수 있다. 판 형상의 압전체를 이용함으로써 종래의 압전 분말보다 압전 특성이 우수하고, 그에 따라 미세한 압력도 용이하게 센싱할 수 있어 센싱 효율을 향상시킬 수 있다.The electronic device of the present invention may include a window, a display unit, and a pressure sensor, and at least one pressure sensor may be provided on at least one of the lower side of the display unit and the lower side of the window. In addition, the pressure sensor may have a piezoelectric layer formed between the first and second electrode layers spaced apart from each other, and the piezoelectric layer may have a plurality of single crystal plate-shaped piezoelectric bodies. By using a plate-shaped piezoelectric body, piezoelectric properties are superior to those of conventional piezoelectric powders, whereby even minute pressure can be easily sensed, thereby improving the sensing efficiency.
또한, 본 발명의 압력 센서는 압전층에 단위 셀 단위로 절개부가 형성될 수 있고, 절개부에 탄성층이 더 형성될 수 있다. 압전층에 복수의 절개부가 형성됨으로써 플렉서블 특성을 가질 수 있다.In addition, in the pressure sensor of the present invention, an incision may be formed in a unit cell unit in the piezoelectric layer, and an elastic layer may be further formed in the incision. By forming a plurality of cutouts in the piezoelectric layer, the piezoelectric layer may have flexible characteristics.
한편, 본 발명의 전자기기는 터치 센서를 더 포함하여 터치 센서와 압력 센서가 연동되어 구동함으로써 터치 위치 및 압력을 더욱 정확하게 검출할 수 있다. 즉, 터치 센서 및 압력 센서가 수평 방향(즉 X 방향과 Y 방향)의 좌표를 동시에 검출하고, 압력 센서가 수직 방향(즉 Z 방향)의 압력을 검출함으로써 터치 위치를 더욱 정확하게 검출할 수 있다.Meanwhile, the electronic device of the present invention may further include a touch sensor to more accurately detect the touch position and pressure by driving the touch sensor and the pressure sensor in conjunction with each other. That is, the touch sensor and the pressure sensor can detect the coordinates in the horizontal direction (that is, the X direction and the Y direction) at the same time, and the pressure sensor can detect the touch position more accurately by detecting the pressure in the vertical direction (that is, the Z direction).
도 1은 본 발명의 제 1 실시 예에 따른 압력 센서의 단면도.1 is a cross-sectional view of a pressure sensor according to a first embodiment of the present invention.
도 2 및 도 3은 압력 센서의 본 발명의 실시 예들에 따른 제 1 및 제 2 전극층의 평면 개략도.2 and 3 are schematic top views of first and second electrode layers in accordance with embodiments of the present invention of a pressure sensor.
도 4는 본 발명의 제 2 실시 예에 따른 압력 센서의 단면도.4 is a sectional view of a pressure sensor according to a second embodiment of the present invention.
도 5 및 도 6은 본 발명의 제 2 실시 예에 따른 압력 센서의 평면 및 단면 사진.5 and 6 are plan and cross-sectional photographs of a pressure sensor according to a second embodiment of the present invention.
도 7는 본 발명의 제 3 실시 예에 따른 압력 센서의 단면도.7 is a sectional view of a pressure sensor according to a third embodiment of the present invention.
도 8은 본 발명의 제 4 실시 예에 따른 압력 센서의 단면도.8 is a sectional view of a pressure sensor according to a fourth embodiment of the present invention.
도 9 및 도 10은 압력 센서의 본 발명의 다른 실시 예들에 따른 제 1 및 제 2 전극층의 평면 개략도.9 and 10 are top plan schematic views of first and second electrode layers according to other embodiments of the present invention of a pressure sensor.
도 11 및 도 12는 본 발명의 제 1 실시 예에 따른 압력 센서를 구비하는 전자기기의 전면 사시도 및 후면 사시도.11 and 12 are front and rear perspective views of an electronic device having a pressure sensor according to a first embodiment of the present invention.
도 13은 도 11의 A-A' 라인을 절단한 상태의 부분 단면도.FIG. 13 is a partial cross-sectional view of the line AA ′ of FIG. 11;
도 14는 본 발명의 제 2 실시 예에 따른 전자기기의 단면도.14 is a cross-sectional view of an electronic device according to a second embodiment of the present disclosure.
도 15는 본 발명의 제 2 실시 예에 따른 전자기기의 압력 센서의 배치 형상을 도시한 평면 개략도.15 is a schematic plan view showing an arrangement of the pressure sensor of the electronic device according to the second embodiment of the present disclosure.
도 16은 본 발명의 제 3 실시 예에 따른 압력 센서를 구비하는 전자기기의 단면도.16 is a cross-sectional view of an electronic device having a pressure sensor according to a third embodiment of the present disclosure.
도 17은 본 발명의 제 4 실시 예에 따른 전자기기의 압력 센서의 배치 형상을 도시한 평면 개략도.17 is a schematic plan view showing an arrangement of the pressure sensor of the electronic device according to the fourth embodiment of the present disclosure.
도 18 내지 도 21은 본 발명의 실시 예들에 따른 압력 센서의 제어 구성도.18 to 21 is a control block diagram of a pressure sensor according to embodiments of the present invention.
도 22는 본 발명의 다른 실시 예에 따른 압력 센서의 데이터 처리 방법을 설명하기 위한 블럭도.22 is a block diagram illustrating a data processing method of a pressure sensor according to another embodiment of the present invention.
도 23은 본 발명의 실시 예들에 따른 압력 센서를 이용한 지문 인식 센서의 구성도.23 is a block diagram of a fingerprint recognition sensor using a pressure sensor in accordance with embodiments of the present invention.
도 24는 본 발명의 다른 실시 예에 따른 압력 센서의 단면도.24 is a cross-sectional view of a pressure sensor according to another embodiment of the present invention.
이하, 첨부된 도면을 참조하여 본 발명의 실시 예를 상세히 설명하기로 한 다. 그러나, 본 발명은 이하에서 개시되는 실시 예에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 것이며, 단지 본 실시 예들은 본 발명의 개시가 완전하도록 하며, 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이다.Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art. It is provided for complete information.
도 1은 본 발명의 제 1 실시 예에 따른 압력 센서의 단면도이고, 도 2 및 도 3은 압력 센서의 제 1 및 제 2 전극층의 개략도이다.1 is a cross-sectional view of a pressure sensor according to a first embodiment of the present invention, and FIGS. 2 and 3 are schematic views of first and second electrode layers of the pressure sensor.
도 1을 참조하면, 본 발명의 일 실시 예에 따른 압력 센서는 서로 이격된 제 1 및 제 2 전극층(100, 200)과, 제 1 및 제 2 전극층(100, 200) 사이에 마련된 압전층(300)을 포함한다. 이때, 압전층(300)은 소정의 두께를 갖는 판 형상의 압전체(310)가 복수 마련될 수 있다. Referring to FIG. 1, a pressure sensor according to an exemplary embodiment of the present invention may include a piezoelectric layer provided between the first and second electrode layers 100 and 200 spaced apart from each other, and the first and second electrode layers 100 and 200. 300). At this time, the piezoelectric layer 300 may be provided with a plurality of plate-like piezoelectric body 310 having a predetermined thickness.
1. 전극층1. Electrode layer
제 1 및 제 2 전극층(100, 200)은 두께 방향(즉 수직 방향)으로 소정 간격 이격되며, 그 사이에 압전층(300)이 마련된다. 제 1 및 제 2 전극층(100, 200)은 제 1 및 제 2 지지층(110, 210)과 제 1 및 제 2 지지층(110, 210) 상에 각각 형성된 제 1 및 제 2 전극(120, 220)을 포함할 수 있다. 즉, 제 1 및 제 2 지지층(110, 210)이 소정 간격 이격되어 형성되며, 제 1 및 제 2 지지층(110, 210)의 표면에 제 1 및 제 2 전극(120, 220)이 각각 형성된다. 여기서, 제 1 및 제 2 전극(120, 220)은 서로 대면하는 방향에 형성될 수도 있고, 서로 대면하지 않도록 형성될 수도 있다. 즉, 제 1 및 제 2 전극(120, 220)은 압전층(300)에 대면하도록 형성될 수도 있고, 어느 하나가 압전층(300)에 대면하고 다른 하나는 압전층(300)에 대면하지 않도록 형성될 수도 있으며, 제 1 및 제 2 전극(120, 220)이 모두 압전층(300)에 대면하지 않도록 형성될 수 있다. 이때, 제 1 및 제 2 전극(120, 220)은 압전층(300)에 접촉되어 형성될 수도 있고, 접촉되지 않도록 형성될 수도 있다. 본 발명에 따른 압력 센서는 예를 들어 하측으로부터 두께 방향으로 제 1 지지층(110), 제 1 전극(120), 압전층(300), 제 2 전극(220) 및 제 2 지지층(210)이 적층되어 압력 센서가 구현될 수 있다. 여기서, 제 1 및 제 2 지지층(110, 210)은 그 일면 표면에 제 1 및 제 2 전극(120, 220)이 형성되도록 제 1 및 제 2 전극(120, 220)을 지지하며, 이를 위해 제 1 및 제 2 지지층(110, 210)은 소정 두께를 갖는 판 형상으로 마련될 수 있다. 또한, 제 1 및 제 2 지지층(110, 210)은 플렉서블 특성을 갖도록 필름 형태로 마련될 수도 있다. 이러한 제 1 및 제 2 지지층(110, 210)은 실리콘(Silicon), 우레탄(Urethane), 폴리우레탄(Polyurethane), 폴리이미드, PET, PC 등이 이용될 수 있고, 액상의 광경화성 모노머(monomer) 및 올리고머(oligomer)와 광개시제(photoinitiate) 및 첨가제(additives)를 이용한 프리폴리머일 수 있다. 또한, 제 1 및 제 2 지지층(110, 210)은 경우에 따라 투명할 수 있고, 불투명할 수도 있다. 한편, 제 1 및 제 2 지지층(110, 210)의 적어도 어느 하나에는 복수의 기공(미도시)이 마련될 수 있다. 예를 들어, 객체의 터치 또는 누름에 따라 하측으로 구부러져 형상이 변형될 수 있는 제 2 지지층(210)이 복수의 기공을 포함할 수 있다. 기공은 예를 들어 1㎛∼500㎛의 사이즈를 가지며 10%∼95%의 기공률로 형성될 수 있다. 제 2 지지층(210) 내에 복수의 기공이 형성됨으로써 제 2 지지층(210)의 탄성력과 복원력을 더욱 향상시킬 수 있다. 이때, 기공률이 10% 미만이면 탄성력과 복원력의 향상이 미미하며, 95%를 초과하는 경우 제 2 지지층(210)의 형상을 유지하지 못할 수도 있다. 또한, 복수의 기공을 갖는 지지층(110, 210)은 표면에는 기공이 형성되지 않는 것이 바람직하다. 즉, 전극(120, 220)이 형성되는 일 표면에 기공이 형성되면 전극(120, 220)이 끊어지거나 전극의 두께가 증가할 수 있으므로 전극(120, 220)이 형성되는 일 표면에는 기공이 형성되지 않는 것이 바람직하다.The first and second electrode layers 100 and 200 are spaced apart by a predetermined interval in the thickness direction (that is, the vertical direction), and the piezoelectric layer 300 is provided therebetween. The first and second electrode layers 100 and 200 are formed on the first and second support layers 110 and 210 and the first and second support layers 110 and 210, respectively. It may include. That is, the first and second support layers 110 and 210 are formed to be spaced apart by a predetermined interval, and the first and second electrodes 120 and 220 are formed on the surfaces of the first and second support layers 110 and 210, respectively. . Here, the first and second electrodes 120 and 220 may be formed to face each other or may not be formed to face each other. That is, the first and second electrodes 120 and 220 may be formed to face the piezoelectric layer 300, so that one of them faces the piezoelectric layer 300 and the other does not face the piezoelectric layer 300. The first and second electrodes 120 and 220 may be formed so as not to face the piezoelectric layer 300. In this case, the first and second electrodes 120 and 220 may be formed in contact with the piezoelectric layer 300 or may not be in contact with each other. In the pressure sensor according to the present invention, for example, the first support layer 110, the first electrode 120, the piezoelectric layer 300, the second electrode 220 and the second support layer 210 are laminated in the thickness direction from the lower side. Thus a pressure sensor can be implemented. Here, the first and second support layers 110 and 210 support the first and second electrodes 120 and 220 so that the first and second electrodes 120 and 220 are formed on one surface thereof. The first and second support layers 110 and 210 may be provided in a plate shape having a predetermined thickness. In addition, the first and second support layers 110 and 210 may be provided in a film form to have flexible characteristics. The first and second support layers 110 and 210 may be silicon, urethane, polyurethane, polyimide, PET, PC, or the like, and a liquid photocurable monomer. And prepolymers using oligomers, photoinitiates, and additives. In addition, the first and second support layers 110 and 210 may be transparent or opaque in some cases. Meanwhile, a plurality of pores (not shown) may be provided in at least one of the first and second support layers 110 and 210. For example, the second support layer 210, which may be bent downward according to the touch or press of the object and may be deformed, may include a plurality of pores. The pores have a size of, for example, 1 μm to 500 μm and may be formed at a porosity of 10% to 95%. By forming a plurality of pores in the second support layer 210, the elastic force and the restoring force of the second support layer 210 may be further improved. In this case, when the porosity is less than 10%, the improvement of the elastic force and the restoring force is insignificant. When the porosity is greater than 95%, the shape of the second support layer 210 may not be maintained. In addition, it is preferable that pores are not formed on the surface of the support layers 110 and 210 having a plurality of pores. That is, when pores are formed on one surface on which the electrodes 120 and 220 are formed, pores are formed on one surface on which the electrodes 120 and 220 are formed because the electrodes 120 and 220 may be broken or the thickness of the electrodes may increase. It is preferable not to.
한편, 제 1 및 제 2 전극(120, 220)은 ITO(Indium Tin Oxide), ATO(Antimony Tin Oxide) 등의 투명 도전성 물질로 형성될 수 있다. 그러나, 제 1 및 제 2 전극(120, 220)은 이러한 물질 이외에 다른 투명 도전성 물질로 형성될 수도 있고, 은(Ag), 백금(Pt), 구리(Cu) 등의 불투명 도전성 물질로 형성될 수도 있다. 또한, 제 1 및 제 2 전극(120, 220)은 서로 교차되는 방향으로 형성될 수 있다. 예를 들어, 제 1 전극(120)이 소정의 폭을 갖도록 일 방향으로 형성되며 이것이 타 방향으로 소정 간격 이격되어 형성될 수 있다. 제 2 전극(220)은 소정의 폭을 갖도록 일 방향과 직교하는 타 방향으로 형성되며, 이것이 타 방향과 직교하는 일 방향으로 소정 간격 이격되어 형성될 수 있다. 즉, 제 1 및 제 2 전극(120, 220)은 도 2에 도시된 바와 같이 서로 직교하는 방향으로 형성될 수 있다. 예를 들어 제 1 전극(120)이 가로 방향으로 소정 폭으로 형성되고 이것이 세로 방향으로 소정 간격 이격되어 복수 배열되고, 제 2 전극(220)이 세로 방향으로 소정 폭으로 형성되고 이것이 가고 방향으로 소정 간격 이격되어 복수 배열될 수 있다. 여기서, 제 1 및 제 2 전극(120, 220)의 폭은 그 사이의 간격보다 크거나 같을 수 있다. 물론, 제 1 및 제 2 전극(120, 220)의 폭이 그 사이의 간격보다 좁을 수도 있지만, 폭이 간격보다 큰 것이 바람직하다. 예를 들어, 제 1 및 제 2 전극(120, 220)의 폭 및 간격의 비율은 10:1 내지 0.5:1일 수 있다. 즉, 간격이 1이라 할 때 폭은 10 내지 0.5일 수 있다. 또한, 제 1 및 제 2 전극(120, 220)은 이러한 형상 이외에 다양한 형상으로 형성될 수도 있다. 예를 들어, 도 3에 도시된 바와 같이 제 1 및 제 2 전극(120, 220)의 어느 하나가 지지층 상에 전체적으로 형성되고 다른 하나는 일 방향 및 타 방향으로 소정의 폭 및 간격을 갖는 대략 사각형의 패턴으로 복수 형성될 수도 있다. 즉, 제 1 전극(120)이 대략 사각형의 패턴으로 복수 형성되고, 제 2 전극(220)이 제 2 지지층(120) 상에 전체적으로 형성될 수 있다. 물론, 사각형 이외에 원형, 다각형 등 다양한 형태의 패턴이 가능하다. 또한, 제 1 및 제 2 전극(120, 220)은 어느 하나가 지지층 상에 전체적으로 형성되고, 다른 하나는 일 방향 및 타 방향으로 연장되는 격자 모양으로 형성될 수도 있다. 한편, 제 1 및 제 2 전극(120, 220)은 예를 들어 0.1㎛∼500㎛의 두께로 형성되며, 제 1 및 제 2 전극(120, 220)은 예를 들어 1㎛∼10000㎛의 간격으로 형성될 수 있다. 여기서, 제 1 및 제 2 전극(120, 220)은 압전층(300)과 접촉될 수 있다. 물론, 제 1 및 제 2 전극(120, 220)은 압전층(300)과 소정 간격 이격된 상태를 유지하고, 소정의 압력, 예를 들어 사용자의 터치 입력이 인가되면 제 1 및 제 2 전극(120, 220)의 적어도 어느 하나가 국부적으로 압전층(300)과 접촉될 수 있다. 이때, 압전층(300)은 소정 깊이로 압축될 수도 있다.Meanwhile, the first and second electrodes 120 and 220 may be formed of a transparent conductive material such as indium tin oxide (ITO) or antimony tin oxide (ATO). However, the first and second electrodes 120 and 220 may be formed of a transparent conductive material other than such a material, or may be formed of an opaque conductive material such as silver (Ag), platinum (Pt), copper (Cu), or the like. have. In addition, the first and second electrodes 120 and 220 may be formed to cross each other. For example, the first electrode 120 may be formed in one direction to have a predetermined width, and the first electrode 120 may be formed to be spaced apart from each other by a predetermined interval. The second electrode 220 may be formed in another direction orthogonal to one direction to have a predetermined width, and the second electrode 220 may be formed to be spaced apart at a predetermined interval in one direction orthogonal to the other direction. That is, the first and second electrodes 120 and 220 may be formed in directions perpendicular to each other as shown in FIG. 2. For example, the first electrode 120 is formed to a predetermined width in the horizontal direction, which is arranged in a plurality of spaced apart a predetermined interval in the vertical direction, the second electrode 220 is formed to a predetermined width in the vertical direction, which is predetermined in the thin direction A plurality of spaced apart may be arranged. Here, the widths of the first and second electrodes 120 and 220 may be greater than or equal to the gap therebetween. Of course, the widths of the first and second electrodes 120 and 220 may be narrower than the gap therebetween, but the width is preferably larger than the gap. For example, the ratio of the width and the spacing of the first and second electrodes 120 and 220 may be 10: 1 to 0.5: 1. That is, when the interval is 1, the width may be 10 to 0.5. In addition, the first and second electrodes 120 and 220 may be formed in various shapes in addition to these shapes. For example, as shown in FIG. 3, one of the first and second electrodes 120 and 220 is formed on the support layer as a whole, and the other is a substantially rectangular shape having a predetermined width and spacing in one direction and the other direction. It may be formed in a plurality of patterns. That is, the plurality of first electrodes 120 may be formed in a substantially rectangular pattern, and the second electrodes 220 may be entirely formed on the second support layer 120. Of course, in addition to the square, a variety of patterns, such as a circle, a polygon is possible. In addition, one of the first and second electrodes 120 and 220 may be formed on the support layer as a whole, and the other may be formed in a grid shape extending in one direction and the other direction. Meanwhile, the first and second electrodes 120 and 220 may be formed to have a thickness of, for example, 0.1 μm to 500 μm, and the first and second electrodes 120 and 220 may have an interval of 1 μm to 10000 μm, for example. It can be formed as. Here, the first and second electrodes 120 and 220 may be in contact with the piezoelectric layer 300. Of course, the first and second electrodes 120 and 220 may be kept spaced apart from the piezoelectric layer 300 by a predetermined distance, and when a predetermined pressure, for example, a user's touch input is applied, the first and second electrodes ( At least one of the 120 and 220 may be in contact with the piezoelectric layer 300 locally. In this case, the piezoelectric layer 300 may be compressed to a predetermined depth.
한편, 제 1 및 제 2 전극층(100, 200)의 적어도 어느 하나에는 복수의 홀이 형성될 수 있다. 예를 들어, 도 3에 도시된 바와 같이 제 1 전극층(100)에는 복수의 홀이 형성될 수 있다. 즉, 복수의 홀은 그라운드 전극으로 이용되는 전극층에 형성될 수 있다. 물론, 홀은 제 1 전극층(100) 이외에 신호 전극으로 이용되는 제 2 전극층(200)에 형성될 수도 있고, 제 1 및 제 2 전극층(100, 200)에 모두 형성될 수 있다. 또한, 홀은 제 1 및 제 2 전극(120, 220)의 적어도 어느 하나가 제거되어 제 1 및 제 2 지지층(110, 210)이 노출되도록 형성될 수도 있고, 제 1 및 제 2 전극(120, 220) 뿐만 아니라 제 1 및 제 2 지지층(110, 210)이 제거되어 형성될 수도 있다. 즉, 홀은 전극(120, 220)이 제거되어 지지층(110, 210)이 노출되도록 형성될 수도 있고, 전극(120, 220)으로부터 지지층(110, 210)을 관통하도록 형성될 수도 있다. 또한, 홀은 전극(120, 220)이 중첩되는 영역에 형성될 수 있다. 예를 들어, 도 3에 도시된 바와 같이 복수의 홀은 제 2 전극(220)과 중첩되는 영역의 제 1 전극(120)에 형성될 수 있다. 여기서, 홀은 제 2 전극(220)과 중첩되는 영역에 하나 형성될 수도 있고, 둘 이상 복수 형성될 수도 있다. 물론, 도 2에 도시된 바와 같이 제 1 및 제 2 전극(120, 220)이 일 방향 및 이와 직교하는 타 방향으로 형성되는 경우에도 제 1 및 제 2 전극(120, 220)의 서로 교차되는 영역에 홀이 형성될 수 있다. 홀이 형성됨으로써 유전층(300)의 압축을 더욱 용이하게 할 수 있다. 이러한 홀은 예를 들어 0.05㎜∼10㎜의 직경으로 형성될 수 있다. 홀의 직경이 0.05㎜ 미만일 경우 유전층(300)의 압축 효과가 저하될 수 있고, 직경이 10㎜를 초과할 경우 유전층(300)의 복원력이 저하될 수 있다. 그러나, 홀의 사이즈는 압력 센서 또는 입력 장치의 사이즈에 따라 다양하게 변경할 수 있다.Meanwhile, a plurality of holes may be formed in at least one of the first and second electrode layers 100 and 200. For example, as illustrated in FIG. 3, a plurality of holes may be formed in the first electrode layer 100. That is, the plurality of holes may be formed in the electrode layer used as the ground electrode. Of course, the hole may be formed in the second electrode layer 200 used as the signal electrode in addition to the first electrode layer 100, and may be formed in both the first and second electrode layers 100 and 200. In addition, the holes may be formed such that at least one of the first and second electrodes 120 and 220 is removed to expose the first and second support layers 110 and 210, and the first and second electrodes 120, 220 as well as the first and second support layers 110 and 210 may be removed. That is, the holes may be formed to expose the support layers 110 and 210 by removing the electrodes 120 and 220, or may be formed to penetrate the support layers 110 and 210 from the electrodes 120 and 220. Also, the hole may be formed in an area where the electrodes 120 and 220 overlap. For example, as illustrated in FIG. 3, a plurality of holes may be formed in the first electrode 120 in an area overlapping the second electrode 220. Here, one hole may be formed in an area overlapping with the second electrode 220, and two or more holes may be formed. Of course, as shown in FIG. 2, even when the first and second electrodes 120 and 220 are formed in one direction and the other direction orthogonal thereto, regions where the first and second electrodes 120 and 220 intersect with each other. Holes may be formed in the. Holes may be formed to facilitate compression of the dielectric layer 300. Such holes can be formed, for example, with a diameter of 0.05 mm to 10 mm. When the diameter of the hole is less than 0.05mm, the compressive effect of the dielectric layer 300 may be reduced, and when the diameter exceeds 10mm, the restoring force of the dielectric layer 300 may be reduced. However, the size of the hole can be variously changed according to the size of the pressure sensor or the input device.
2. 2. 압전층Piezoelectric layer
압전층(300)은 제 1 및 제 2 전극층(100, 200) 사이에 소정 두께로 마련되며, 예를 들어 10㎛∼1000㎛의 두께로 마련될 수 있다. 즉, 압전층(300)은 압력 센서가 채용되는 전자기기의 사이즈에 따라 다양한 두께로 마련될 수 있는데, 예를 들어 10㎛∼1000㎛의 두께로 마련될 수 있다. 이러한 압전층(300)은 소정의 두께를 갖는 대략 사각형의 판 형상의 압전체(310)와 폴리머(320)를 이용하여 형성될 수 있다. 즉, 복수의 판 형상의 압전체(310)가 폴리머(320) 내에 마련되어 압전층(300)이 형성될 수 있다. 여기서, 압전체(310)는 예를 들어 PZT(Pb, Zr, Ti), NKN(Na, K, Nb), BNT(Bi, Na, Ti) 계열의 압전 물질을 이용하여 형성할 수 있다. 물론, 압전체(310)는 다양한 압전 재료로 형성할 수 있는데, 티탄산 바륨(barium titanate), 티탄산납(lead titanate), 티탄산 지르콘산납(lead zirconate titanate), 니오브산 칼륨(potassium niobate), 니오브산 리튬(lithium niobate), 탄탈산 리튬(lithium tantalate), 텅스텐산 나트륨(sodium tungstate), 산화아연(zinc oxide), 니오브산 나트륨 칼륨(potassium sodium niobate), 비스무트 페라이트(bismuth ferrite), 니오브산 나트륨(sodium niobate), 티탄산 비스무트(bismuth titanate) 등을 포함할 수 있다. 그러나, 압전체(310)는 플루오르화물 중합체(fluoride 重合體) 또는 그 공중합체(共重合體)로 형성될 수 있다. 이러한 소정의 판 형상의 압전체(310), 즉 일 방향 및 이와 직교하는 타 방향으로 소정의 길이를 갖고 소정의 두께를 갖는 대략 사각형의 판 형태로 형성될 수 있다. 예를 들어, 압전체(310)는 3㎛∼5000㎛의 사이즈로 형성될 수 있다. 이러한 압전체(310)가 일 방향 및 타 방향으로 복수 배열될 수 있다. 즉, 제 1 및 제 2 전극층(100, 200) 사이의 두께 방향(즉, 세로 방향)과 이와 직교하는 평면 방향(즉, 가로 방향)으로 복수 배열될 수 있다. 압전체(310)는 두께 방향으로 적어도 이층 이상으로 배열될 수 있는데, 예를 들어 5층 구조로 형성될 수 있으나, 층수는 한정되지 않는다. 압전체(310)를 폴리머(320) 내에 복수의 층으로 형성하기 위해 다양한 방법이 이용될 수 있다. 예를 들어, 소정 두께의 폴리머층에 소정 두께의 압전체층을 형성하고 이를 복수 적층하여 압전층(300)을 형성할 수 있다. 즉, 압전층(300)보다 얇은 두께의 폴리머층 상에 판 형상의 압전판을 소정 간격으로 배치하여 압전체층을 형성하고, 이를 복수 적층하여 압전층(300)을 형성할 수 있다. 그러나, 폴리머(320) 내에 압전체(310)가 형성된 압전층(300)은 다양한 방법으로 형성할 수 있다. 한편, 압전체(310)는 동일 크기를 갖고 동일 간격으로 이격되는 것이 바람직하다. 그러나, 압전체(310)는 적어도 둘 이상의 크기 및 적어도 둘 이상의 간격으로 마련될 수도 있다. 이때, 압전체(310)는 30% 내지 99%의 밀도로 형성될 수 있고, 모든 영역에서 동일 밀도로 마련되는 것이 바람직하다. 즉, 압전체(310)는 폴리머 포함 압전층(300)에 대하여 30% 내지 99%의 함량으로 마련될 수 있다. 그러나, 압전체(310)는 적어도 일 영역이 60% 이상의 밀도를 갖도록 마련될 수 있다. 예를 들어, 압전체(310)의 적어도 일 영역이 65% 정도의 밀도를 갖고 적어도 타 영역이 90%의 밀도를 갖게 되면, 밀도가 큰 영역에서 더 큰 전력을 생성할 수 있지만, 60% 이상의 밀도를 가지게 되면 압전층(310)에서 발생되는 전력을 제어부에서 충분히 센싱할 수 있다. 또한, 본 발명의 일 실시 예에 따른 압전체(310)는 단결정 형태로 형성되어 압전 특성이 우수하다. 즉, 종래의 압전 분말을 이용하는 경우에 비해 판 형태의 압전체(310)를 이용함으로써 압전 특성이 우수하고, 그에 따라 미세한 터치에 의해서도 압력을 검출할 수 있어 터치 입력의 오류를 방지할 수 있다. 한편, 폴리머(320)는 에폭시(epoxy), 폴리이미드(polyimide) 및 액정 결정성 폴리머(Liquid Crystalline Polymer, LCP)로 구성된 군으로부터 선택된 하나 이상을 포함할 수 있으나, 이에 제한되는 것은 아니다. 또한, 폴리머(320)는 열경화성 수지로 이루어질 수 있다. 열경화성 수지로는 예를 들어 노볼락 에폭시 수지(Novolac Epoxy Resin), 페녹시형 에폭시 수지(Phenoxy Type Epoxy Resin), 비피에이형 에폭시 수지(BPA Type Epoxy Resin), 비피에프형 에폭시 수지(BPF Type Epoxy Resin), 하이드로네이트 비피에이 에폭시 수지(Hydrogenated BPA Epoxy Resin), 다이머산 개질 에폭시 수지(Dimer Acid Modified Epoxy Resin), 우레탄 개질 에폭시 수지(Urethane Modified Epoxy Resin), 고무 개질 에폭시 수지(Rubber Modified Epoxy Resin) 및 디씨피디형 에폭시 수지(DCPD Type Epoxy Resin)로 이루어진 군으로부터 선택된 하나 이상을 포함할 수 있다. 또한, 폴리머(320)는 압축 및 복원 가능한 물질로 형성될 수 있다. 예를 들어, 폴리머(320)는 상기 물질 중에서 압축 및 복원 가능한 물질로 형성될 수 있다. 물론, 상기 물질의 폴리머(320) 대신에 압축 및 복원 가능한 물질을 이용하여 압전체(310)를 혼합할 수도 있다. 예를 들어, 실리콘, 고무, 젤, 포론, 우레탄 등을 이용할 수 있다.The piezoelectric layer 300 is provided to have a predetermined thickness between the first and second electrode layers 100 and 200, and may be provided to have a thickness of, for example, 10 μm to 1000 μm. That is, the piezoelectric layer 300 may be provided in various thicknesses according to the size of the electronic device employing the pressure sensor, for example, may be provided in a thickness of 10 ㎛ to 1000 ㎛. The piezoelectric layer 300 may be formed using a substantially rectangular plate-like piezoelectric body 310 and a polymer 320 having a predetermined thickness. That is, a plurality of plate-shaped piezoelectric bodies 310 may be provided in the polymer 320 to form the piezoelectric layer 300. Here, the piezoelectric body 310 may be formed using, for example, PZT (Pb, Zr, Ti), NKN (Na, K, Nb), or BNT (Bi, Na, Ti) -based piezoelectric materials. Of course, the piezoelectric material 310 may be formed of various piezoelectric materials, such as barium titanate, lead titanate, lead zirconate titanate, potassium niobate, and lithium niobate. (lithium niobate), lithium tantalate, sodium tungstate, zinc oxide, potassium niobate, potassium sodium niobate, bismuth ferrite, sodium niobate niobate), bismuth titanate, and the like. However, the piezoelectric body 310 may be formed of a fluoride polymer or a copolymer thereof. The predetermined plate-shaped piezoelectric body 310, that is, may be formed in a substantially rectangular plate shape having a predetermined length and a predetermined thickness in one direction and the other direction orthogonal thereto. For example, the piezoelectric body 310 may be formed in a size of 3 μm to 5000 μm. The piezoelectric body 310 may be arranged in plural in one direction and in the other direction. That is, a plurality of layers may be arranged in a thickness direction (ie, a vertical direction) between the first and second electrode layers 100 and 200 and in a plane direction (ie, a horizontal direction) orthogonal thereto. The piezoelectric body 310 may be arranged in at least two layers or more in the thickness direction, for example, may be formed in a five-layer structure, but the number of layers is not limited. Various methods may be used to form the piezoelectric body 310 in a plurality of layers in the polymer 320. For example, the piezoelectric layer 300 may be formed by forming a piezoelectric layer having a predetermined thickness on the polymer layer having a predetermined thickness and stacking a plurality of piezoelectric layers. That is, the piezoelectric layer may be formed by arranging plate-shaped piezoelectric plates at predetermined intervals on the polymer layer having a thickness thinner than that of the piezoelectric layer 300, and may be stacked in plural to form the piezoelectric layer 300. However, the piezoelectric layer 300 in which the piezoelectric body 310 is formed in the polymer 320 may be formed in various ways. On the other hand, the piezoelectric body 310 is preferably the same size and spaced apart at equal intervals. However, the piezoelectric body 310 may be provided at least two or more sizes and at least two or more intervals. In this case, the piezoelectric body 310 may be formed at a density of 30% to 99%, and is preferably provided at the same density in all regions. That is, the piezoelectric body 310 may be provided in a content of 30% to 99% with respect to the piezoelectric layer 300 including the polymer. However, the piezoelectric body 310 may be provided so that at least one region has a density of 60% or more. For example, if at least one area of the piezoelectric body 310 has a density of about 65% and at least another area has a density of 90%, it is possible to generate more power in a high density area, but at a density of 60% or more. When having the power generated in the piezoelectric layer 310 can be sufficiently sensed by the controller. In addition, the piezoelectric body 310 according to an embodiment of the present invention is formed in a single crystal form and thus has excellent piezoelectric characteristics. That is, by using the piezoelectric body 310 in the form of a plate compared to the case of using a conventional piezoelectric powder, the piezoelectric properties are excellent, and thus pressure can be detected even by a fine touch, thereby preventing errors in the touch input. Meanwhile, the polymer 320 may include one or more selected from the group consisting of epoxy, polyimide, and liquid crystal crystalline polymer (LCP), but is not limited thereto. In addition, the polymer 320 may be made of a thermosetting resin. Examples of thermosetting resins include Novolac Epoxy Resin, Phenoxy Type Epoxy Resin, BPA Type Epoxy Resin and BPF Type Epoxy Resin. Hydrogenated BPA Epoxy Resin, Dimer Acid Modified Epoxy Resin, Urethane Modified Epoxy Resin, Rubber Modified Epoxy Resin and DC It may include one or more selected from the group consisting of PDPD type epoxy resin (DCPD Type Epoxy Resin). In addition, the polymer 320 may be formed of a compressible and recoverable material. For example, the polymer 320 may be formed of a compressible and recoverable material among the materials. Of course, the piezoelectric material 310 may be mixed using a compressible and recoverable material instead of the polymer 320 of the material. For example, silicone, rubber, gel, poron, urethane and the like can be used.
한편, 압전층(300)에는 전자파 차폐 및 흡수 재료가 더 포함될 수 있다. 즉, 폴리머(320) 내에 전자파 차폐 및 흡수 재료가 더 함유될 수 있다. 이러한 전자파 차폐 및 흡수 재료는 적어도 하나 이상의 크기를 갖는 적어도 하나 이상의 물질을 이용할 수 있다. 즉, 복수의 크기를 갖는 동종 물질을 이용하거나, 복수의 크기를 갖는 둘 이상의 이종 물질을 전자파 차폐 및 흡수 재료로 이용할 수 있다. 이렇게 압전층(300) 내에 전자파 차폐 및 흡수 재료가 더 함유됨으로써 전자파를 차폐 또는 흡수할 수 있다. 전자파 차폐 및 흡수 재료는 페라이트, 알루미나 등을 포함할 수 있으며, 압전층(300) 내에 0.1중량% 내지 50중량% 함유될 수 있다. 즉, 압전층(300) 재료 100중량%에 대하여 전자파 차폐 및 흡수 재료는 0.1중량% 내지 50중량% 함유될 수 있다. 전자파 차폐 및 흡수 재료가 1중량% 미만이면 전자파 차폐 및 흡수 특성이 낮으며, 50중량%를 초과할 경우 압전층(300)의 압전 특성이 저하될 수 있다.Meanwhile, the piezoelectric layer 300 may further include an electromagnetic shielding and absorbing material. That is, the electromagnetic shielding and absorbing material may be further contained in the polymer 320. Such electromagnetic shielding and absorbing materials may utilize at least one or more materials having at least one or more sizes. That is, a homogeneous material having a plurality of sizes may be used, or two or more heterogeneous materials having a plurality of sizes may be used as the electromagnetic shielding and absorption material. As such, the electromagnetic shielding and absorbing material is further contained in the piezoelectric layer 300 to shield or absorb electromagnetic waves. The electromagnetic shielding and absorbing material may include ferrite, alumina, or the like, and may be contained in an amount of 0.1 wt% to 50 wt% in the piezoelectric layer 300. That is, the electromagnetic shielding and absorbing material may be contained in an amount of 0.1 wt% to 50 wt% with respect to 100 wt% of the piezoelectric layer 300 material. When the electromagnetic shielding and absorbing material is less than 1% by weight, the electromagnetic shielding and absorbing properties are low, and when the electromagnetic shielding and absorbing material is more than 50% by weight, the piezoelectric properties of the piezoelectric layer 300 may decrease.
3. 압전체의 다른 예3. Other examples of piezoelectric
한편, 압전체(310)는 페로브스카이트(perovskite) 결정 구조를 가지는 압전 물질로 형성되는 배향 원료 조성물과, 배향 원료 조성물 내에 분포하며 ABO3(A는 2가의 금속 원소, B는 4가의 금속 원소)의 일반식을 가지는 산화물로 형성되는 시드 조성물을 포함하는 압전 세라믹 조성물을 소결하여 형성된 압전 세라믹 소결체를 이용할 수도 있다. 여기서, 배향 원료 조성물은 페로브스카이트 결정 구조와 다른 결정 구조를 가지는 물질이 고용체를 형성하는 조성물을 이용할 수 있는데, 예를 들어 정방정계 구조를 가지는 PbTiO3[PT]와 능면체 구조를 가지는 PbZrO3[PZ]가 고용체를 형성하는 PZT계 물질을 이용할 수 있다. 또한, 배향 원료 조성물은 PZT계 물질에 릴랙서(relaxor)로서 Pb(Ni,Nb)O3[PNN], Pb(Zn,Nb)O3[PZN] 및 Pb(Mn,Nb)O3[PMN] 중 적어도 하나를 고용한 조성물을 사용하여 PZT계 물질의 특성을 향상시킬 수 있다. 예를 들어, PZT계 물질에 PZN계 물질과 PNN계 물질을 이용하여 높은 압전 특성과 낮은 유전율 및 소결 용이성을 갖는 PZNN계 물질을 릴랙서로서 고용하여 배향 원료 조성물을 형성할 수 있다. PZT계 물질에 PZNN계 물질을 릴랙서로서 고용한 배향 원료 조성물은 (1-x)Pb(Zr0.47Ti0.53)O3-xPb((Ni1-yZny)1/3Nb2/3)O3의 조성식을 가질 수 있다. 여기서, x는 0.1<x<0.5 범위 내의 값을 가질 수 있으며, 바람직하게는 0.30≤x≤0.32 범위 내의 값을 가질 수 있으며, 가장 바람직하게는 0.31의 값을 가질 수 있다. 또한, y는 0.1<y≤0.9 범위 내의 값을 가질 수 있으며, 바람직하게는 0.39≤y≤0.41 범위 내의 값을 가질 수 있으며, 가장 바람직하게는 0.40의 값을 가질 수 있다. 또한, 배향 원료 조성물은 납(Pb)을 포함하지 않는 무연계 압전 물질을 사용할 수도 있다. 이와 같은 무연계 압전 물질로는 Bi0 .5K0. 5TiO3, Bi0.5Na0.5TiO3, K0. 5Na0 . 5NbO3, KNbO3, NaNbO3, BaTiO3, (1-x)Bi0 . 5Na0 . 5TiO3-xSrTiO3, (1-x)Bi0.5Na0.5TiO3-xBaTiO3, (1-x)K0. 5Na0 . 5NbO3-xBi0 . 5Na0 . 5TiO3, BaZr0 . 25Ti0 . 75O3 등 중에서 선택된 적어도 하나의 압전 물질을 포함하는 무연계 압전 물질일 수 있다.On the other hand, the piezoelectric material 310 is an orientation raw material composition formed of a piezoelectric material having a perovskite crystal structure, distributed in the orientation raw material composition, ABO 3 (A is a divalent metal element, B is a tetravalent metal element) The piezoelectric ceramic sintered body formed by sintering the piezoelectric ceramic composition containing the seed composition formed from the oxide which has a general formula of Here, the orientation raw material composition may use a composition in which a material having a crystal structure different from the perovskite crystal structure forms a solid solution. For example, PbTiO 3 [PT] having a tetragonal structure and PbZrO having a rhombohedral structure PZT-based material in which 3 [PZ] forms a solid solution can be used. In addition, the orientation raw material composition is Pb (Ni, Nb) O 3 [PNN], Pb (Zn, Nb) O 3 [PZN] and Pb (Mn, Nb) O 3 [PMN] as a relaxer in PZT-based materials. ] Can be used to improve the properties of the PZT-based material. For example, the PZN-based material and the PNN-based material may be used as the relaxer to form a PZNN-based material having high piezoelectric properties, low dielectric constant, and ease of sintering as a relaxer. An orientation raw material composition employing a PZNN-based material as a relaxer in the PZT-based material is (1-x) Pb (Zr 0.47 Ti 0.53 ) O 3 -xPb ((Ni 1-y Zn y ) 1/3 Nb 2/3 ) It may have a composition formula of O 3 . Here, x may have a value in the range of 0.1 <x <0.5, preferably may have a value in the range of 0.30 ≦ x ≦ 0.32, and most preferably may have a value of 0.31. In addition, y may have a value in the range of 0.1 <y ≦ 0.9, preferably a value in the range of 0.39 ≦ y ≦ 0.41, and most preferably may have a value of 0.40. In addition, the orientation raw material composition may use a lead-free piezoelectric material containing no lead (Pb). Such a piezoelectric material is associated non-Bi 0 .5 K 0. 5 TiO 3 , Bi 0.5 Na 0.5 TiO 3, K 0. 5 Na 0. 5 NbO 3 , KNbO 3 , NaNbO 3 , BaTiO 3 , (1-x) Bi 0 . 5 Na 0 . 5 TiO 3 -xSrTiO 3, (1 -x) Bi 0.5 Na 0.5 TiO 3 -xBaTiO 3, (1-x) K 0. 5 Na 0. 5 NbO 3 -xBi 0 . 5 Na 0 . 5 TiO 3 , BaZr 0 . 25 Ti 0 . It may be a lead-free piezoelectric material including at least one piezoelectric material selected from 75 O 3 and the like.
시드 조성물은 ABO3의 일반식을 가지는 산화물로 형성되는데, ABO3는 배향성을 갖는 판 형상의 페로브스카이트(perovskite) 구조를 가지는 산화물로 A는 2가의 금속 원소로 이루어지며, B는 4가의 금속 원소로 이루어진다. ABO3의 일반식을 가지는 산화물로 형성되는 시드 조성물은 CaTiO3, BaTiO3, SrTiO3, PbTiO3 및 Pb(Ti,Zr)O3 중 적어도 하나를 포함할 수 있다. 여기서, 시드 조성물은 배향 원료 조성물에 대하여 1vol% 내지 10vol%의 부피비로 포함될 수 있다. 시드 조성물이 배향 원료 조성물에 대하여 1vol% 미만으로 포함되면 시드 조성물에 의하여 결정 배향성이 향상되는 효과가 미미하며, 10 vol%를 초과하여 포함되면 압전 세라믹 소결체의 압전 성능이 저하된다.Seed composition is formed of an oxide having a general formula of ABO 3, ABO 3 is made of an oxide having a perovskite (perovskite) the structure of the plate-like having an orientation A is a bivalent metal element, B is quadrivalent It consists of a metal element. Oxide composition that is formed of an oxide having a general formula of ABO 3 may include CaTiO 3, BaTiO 3, SrTiO 3 , PbTiO 3 , and Pb, at least one of (Ti, Zr) O 3. Here, the seed composition may be included in a volume ratio of 1 vol% to 10 vol% with respect to the orientation raw material composition. When the seed composition is included in less than 1 vol% with respect to the orientation raw material composition, the effect of improving the crystal orientation by the seed composition is insignificant, and when it is included in excess of 10 vol%, the piezoelectric performance of the piezoelectric ceramic sintered compact is lowered.
상기와 같이 배향 원료 조성물 및 시드 조성물을 포함하는 압전 세라믹 조성물은 판상 입형 성장법(TGG: Templated Grain Growth)에 의하여 시드 조성물과 동일한 방향성을 가지며 성장하게 된다. 즉, 압전 세라믹 소결체는, 예를 들어 0.69Pb(Zr0.47Ti0.53)O3-0.31Pb((Ni0.6Zn0.4)1/3Nb2/3)O3의 조성식을 가지는 배향 원료 조성물에 BaTiO3를 시드 조성물로 사용함으로써 1000℃ 이하의 낮은 온도에서도 소결이 가능할 뿐만 아니라, 결정 배향성을 향상시키고, 전기장에 따른 변위량을 극대화할 수 있어 단결정 물질과 유사한 높은 압전 특성을 가지게 된다.The piezoelectric ceramic composition including the orientation raw material composition and the seed composition as described above is grown with the same orientation as the seed composition by a templated grain growth (TGG). That is, the piezoelectric ceramic sintered body is, for example, BaTiO 3 in the orientation raw material composition having a composition formula of 0.69Pb (Zr 0.47 Ti 0.53 ) O 3 -0.31Pb ((Ni 0.6 Zn 0.4 ) 1/3 Nb 2/3 ) O 3 . By using as a seed composition, not only sintering is possible at a low temperature of 1000 ° C. or less, but also the crystal orientation can be improved, and the displacement amount according to the electric field can be maximized to have high piezoelectric characteristics similar to that of a single crystal material.
배향 원료 조성물에 결정 배향성을 향상시키는 시드 조성물을 첨가하고 이를 소결하여 압전 세라믹 소결체를 제조함으로써, 전기장에 따른 변위량을 극대화하고, 압전 특성을 현저하게 향상시킬 수 있다.By adding a seed composition that improves crystal orientation to the orientation raw material composition and sintering the same, a piezoelectric ceramic sintered body can be manufactured, thereby maximizing the displacement amount according to the electric field and remarkably improving the piezoelectric properties.
상기한 바와 같이 본 발명의 제 1 실시 예에 따른 압력 센서는 서로 이격된 제 1 및 제 2 전극층(100, 200) 사이에 압전층(300)이 형성되고, 압전층(300)은 소정의 단결정의 판 형상의 압전체(310)가 복수 마련될 수 있다. 판 형상의 압전체(310)를 이용함으로써 종래의 압전 분말보다 압전 특성이 우수하고, 그에 따라 미세한 압력도 용이하게 센싱할 수 있어 센싱 효율을 향상시킬 수 있다.As described above, in the pressure sensor according to the first embodiment of the present invention, the piezoelectric layer 300 is formed between the first and second electrode layers 100 and 200 spaced apart from each other, and the piezoelectric layer 300 has a predetermined single crystal. A plurality of plate-shaped piezoelectric elements 310 may be provided. By using the plate-shaped piezoelectric body 310, the piezoelectric properties are superior to those of the conventional piezoelectric powder, and thus, even minute pressure can be easily sensed, thereby improving the sensing efficiency.
즉, 현재 주로 이용되는 압전 소재는 PZT(lead zirconatetita-nate) 세라믹이 폭넓게 사용되고 있다. PZT는 현재까지 80년 이상 사용되면서 개선되어 현재 수준에서 더 이상 개선이 이루어지지 않고 있다. 이에 비해, 압전 재료를 응용하는 분야에서는 물성이 개선된 소재를 요구하고 있다. 단결정은 이러한 요구에 부응하기 위해 개발된 소재로서 PZT 세라믹이 한계에 도달한 물성을 향상시켜 응용소자의 성능을 개선할 수 있는 신소재이다. 종래 압전 재료의 주류인 다결정(Polycrystal) 세라믹스에 비해 2배 이상의 압전 상수(d33)를 얻을 수 있으며, 전기 기계 결합 계수도 크고, 뛰어난 압전 특성을 나타낸다.In other words, PZT (lead zirconatetita-nate) ceramic is widely used as a piezoelectric material currently used. PZT has been in use for more than 80 years to date and has not been improved at this level. In contrast, in the field of application of piezoelectric materials, there is a demand for materials having improved physical properties. Single crystal is a new material developed to meet these demands, and is a new material that can improve the performance of application devices by improving the physical properties of PZT ceramics. Compared to polycrystal ceramics, which are the mainstream of conventional piezoelectric materials, a piezoelectric constant (d 33 ) of 2 times or more can be obtained, and the electromechanical coupling coefficient is also large and exhibits excellent piezoelectric properties.
아래 [표 1]에서 보는 바와 같이 압전소재의 특성을 좌우하는 d33, d31 (Piezoelectric Constant: 압전상수)과 K33(Elec-tromechanical Coupling Factor : 전기기계 결합계수) 값이 기존의 다결정에 비해 압전 단결정은 매우 높음을 볼 수 있다. 이러한 물성의 우수성은 이를 응용한 소자에 적용함에 있어서 탁월한 효과를 보여준다.As shown in [Table 1], the values of d 33 , d 31 (Piezoelectric Constant) and K33 (Elec-tromechanical Coupling Factor), which influence the characteristics of piezoelectric materials, are piezoelectric, It can be seen that the single crystal is very high. The superiority of these physical properties shows an excellent effect in the application of this device.
polycrystalpolycrystal single crystalsingle crystal
d33[pC/N]d33 [pC / N] 160∼338160-338 500500
d31[pC/N]d31 [pC / N] -50-50 -280-280
strain[%]strain [%] ≒0.4≒ 0.4 ≒1.0≒ 1.0
이 때문에 압전 단결정은 기존의 다결정 세라믹스에 비해, 의료 및 비파괴 검사, 어군 탐지 등의 초음파 진동자로 보다 선명한 화상을 얻을 수 있으며, 세척기 등의 초음파 진동자로 보다 강력한 발진이 가능하고, 프린터 헤드, HDD 헤드의 위치 결정 장치, 손떨림 방지 장치 등의 고정밀도 제어용 액튜에이터 등 보다 응답성이 뛰어나면서도 소형화가 가능하다.For this reason, piezoelectric single crystals can produce clearer images with ultrasonic vibrators, such as medical and non-destructive inspections and fish group detection, compared to conventional polycrystalline ceramics. It is more responsive and more compact than a high precision control actuator such as a positioning device and an anti-shake device.
한편, 판 형상의 단결정 압전체를 제조하기 위해 고상 단결정 성장법, 브리지만법, 염용융법 등을 이용할 수 있다. 이러한 방법으로 제조된 단결정 압전체를 폴리머에 혼합한 후 인쇄, 성형 등의 방법으로 압전층을 형성할 수 있다.On the other hand, in order to manufacture a plate-shaped single crystal piezoelectric body, the solid-state single crystal growth method, Bridgman method, salt melting method, etc. can be used. After the single crystal piezoelectric material prepared in this manner is mixed with the polymer, the piezoelectric layer can be formed by printing or molding.
도 4는 본 발명의 제 2 실시 예에 따른 압력 센서의 단면도이다. 또한, 도 5 및 도 6은 본 발명의 제 2 실시 예에 따른 압력 센서의 압전층의 평면 및 단면 사진이다.4 is a cross-sectional view of the pressure sensor according to the second embodiment of the present invention. 5 and 6 are plan and cross-sectional photographs of the piezoelectric layer of the pressure sensor according to the second embodiment of the present invention.
도 4 내지 도 6을 참조하면, 본 발명의 제 2 실시 예에 따른 압력 센서는 서로 이격된 제 1 및 제 2 전극층(100, 200)과, 제 1 및 제 2 전극층(100, 200) 사이에 마련된 압전층(300)을 포함한다. 이때, 압전층(300)은 소정 두께의 압전 세라믹으로 형성될 수 있다. 즉, 본 발명의 일 실시 예는 압전층(300)이 판 형상의 압전체(310)가 폴리머(320) 내에 형성되었지만, 본 발명의 다른 실시 예는 압전 세라믹을 이용하여 소정 두께의 압전층(300)을 형성할 수 있다. 또한, 압전층(300)은 압전체(310)와 동일 물질을 이용할 수 있다. 이러한 본 발명의 제 2 실시 예를 제 1 실시 예의 설명과 중복된 내용은 생략하여 설명하면 다음과 같다.4 to 6, the pressure sensor according to the second embodiment of the present invention may be disposed between the first and second electrode layers 100 and 200 spaced apart from each other, and the first and second electrode layers 100 and 200. It includes a piezoelectric layer 300 provided. In this case, the piezoelectric layer 300 may be formed of a piezoelectric ceramic having a predetermined thickness. That is, in one embodiment of the present invention, the piezoelectric layer 300 has a plate-like piezoelectric body 310 formed in the polymer 320, but in another embodiment of the present invention, the piezoelectric layer 300 having a predetermined thickness using piezoelectric ceramics. ) Can be formed. In addition, the piezoelectric layer 300 may use the same material as the piezoelectric body 310. The second embodiment of the present invention will be described with the description omitted from the description of the first embodiment as follows.
압전층(300)은 일 방향 및 이와 대향되는 타 방향으로 소정의 폭 및 간격으로 형성될 수 있다. 즉, 압전층(300)은 소정 깊이로 절개부(330)가 형성되어 소정 폭 및 간격으로 복수 분리될 수 있다. 이때, 절개부(330)는 일 방향으로 소정 폭의 제 1 절개부가 복수 형성되고, 이와 직교하는 타 방향으로 소정 폭의 제 2 절개부가 복수 형성될 수 있다. 따라서, 압전층(300)은 각각 복수의 제 1 및 제 2 절개부에 의해 도 5 및 도 6에 도시된 바와 같이 소정의 폭 및 간격을 갖는 복수의 단위 셀로 분할될 수 있다. 이때, 압전층(300)은 전체 두께가 절개될 수도 있고, 전체 두께의 50% 내지 95%의 두께가 절개될 수 있다. 즉, 압전층(300)은 전체 두께가 절개되거나 전체 두께의 50% 내지 95%가 절개되어 절개부가 형성될 수 있다. 이렇게 압전층(300)이 절개됨으로써 압전층(300)은 소정의 플렉서블 특성을 갖게 된다. 이때, 압전층(300)은 예를 들어 10㎛∼5000㎛ 정도의 크기를 갖고 1㎛∼300㎛의 간격을 가질 수 있도록 절개될 수 있다. 즉, 절개부(330)에 의해 단위 셀이 10㎛∼5000㎛ 정도의 크기를 갖고 1㎛∼300㎛의 간격을 가질 수 있다. 한편, 압전층(300)의 제 1 및 제 2 절개부는 제 1 및 제 2 전극층(100, 200)의 전극 사이의 간격에 대응될 수 있다. 즉, 제 1 전극층(100)의 제 1 전극의 간격에 대응하도록 제 1 절개부가 형성되고 제 2 전극층(200)의 제 2 전극의 간격에 대응하도록 제 2 절개부가 형성될 수 있다. 이때, 전극층의 간격과 절개부의 간격은 동일할 수도 있고, 전극층의 간격이 절개부의 간격보다 크거나 작을 수 있다. 한편, 압전층(300)을 레이저, 다이싱, 블레이트 컷 등의 방법으로 절개하여 절개부를 형성할 수 있다. 또한, 압전층(300)은 그린 바(green bar) 상태에서 레이저, 다이싱, 블레이드 컷 등의 방법으로 절개하여 절개부를 형성한 후 소성 공정을 실시하여 형성할 수도 있다.The piezoelectric layer 300 may be formed at a predetermined width and interval in one direction and the other direction opposite thereto. That is, the piezoelectric layer 300 may have a cutout 330 formed at a predetermined depth and may be separated in a plurality of widths and intervals. In this case, the cutout 330 may include a plurality of first cutouts having a predetermined width in one direction, and a plurality of second cutouts having a predetermined width in another direction perpendicular to the cutouts 330. Therefore, the piezoelectric layer 300 may be divided into a plurality of unit cells having a predetermined width and spacing, as shown in FIGS. 5 and 6, by the plurality of first and second cutouts, respectively. In this case, the entire thickness of the piezoelectric layer 300 may be cut, or a thickness of 50% to 95% of the total thickness may be cut. That is, the piezoelectric layer 300 may be cut in its entire thickness, or 50% to 95% of the total thickness may be cut to form a cutout. As the piezoelectric layer 300 is cut in this manner, the piezoelectric layer 300 has a predetermined flexible characteristic. In this case, the piezoelectric layer 300 may be cut to have, for example, a size of about 10 μm to about 5000 μm and an interval of about 1 μm to about 300 μm. That is, by the cutout 330, the unit cell may have a size of about 10 μm to about 5000 μm and have an interval of about 1 μm to about 300 μm. Meanwhile, the first and second cutouts of the piezoelectric layer 300 may correspond to gaps between the electrodes of the first and second electrode layers 100 and 200. That is, the first cutout may be formed to correspond to the gap of the first electrode of the first electrode layer 100, and the second cutout may be formed to correspond to the gap of the second electrode of the second electrode layer 200. At this time, the spacing of the electrode layer and the spacing of the cut may be the same, the spacing of the electrode layer may be larger or smaller than the spacing of the cut. On the other hand, the piezoelectric layer 300 may be cut by a method such as laser, dicing, or blade cut to form an incision. In addition, the piezoelectric layer 300 may be formed by cutting in a green bar state by a laser, dicing, blade cut, etc. to form a cutout, and then performing a firing process.
도 7은 본 발명의 제 3 실시 예에 따른 압력 센서의 단면도이다.7 is a cross-sectional view of a pressure sensor according to a third embodiment of the present invention.
도 7을 참조하면, 본 발명의 제 3 실시 예에 따른 압력 센서는 서로 이격된 제 1 및 제 2 전극층(100, 200)과, 제 1 및 제 2 전극층(100, 200) 사이에 마련되며 일 방향 및 타 방향으로 복수의 절개부(330)가 형성된 압전층(300)과, 압전층(300)의 절개부(330)에 형성된 탄성층(400)을 포함할 수 있다. 이때, 절개부(330)는 압전층(300)의 두께 전체에 형성될 수 있고, 소정 두께로 형성될 수 있다. 즉, 절개부(330)는 압전층(300) 두께의 50% 내지 100%의 두께로 형성될 수 있다. 따라서, 압전층(300)은 절개부(330)에 의해 일 방향 및 타 방향으로 소정 간격 이격되어 단위 셀 단위로 분리되고, 단위 셀 사이에 탄성층(400)이 형성될 수 있다. Referring to FIG. 7, the pressure sensor according to the third embodiment of the present invention is provided between the first and second electrode layers 100 and 200 spaced apart from each other and the first and second electrode layers 100 and 200. The piezoelectric layer 300 having the plurality of cutouts 330 formed in the direction and the other direction, and the elastic layer 400 formed on the cutouts 330 of the piezoelectric layer 300 may be included. In this case, the cutout 330 may be formed over the entire thickness of the piezoelectric layer 300, and may be formed to have a predetermined thickness. That is, the cutout 330 may be formed to a thickness of 50% to 100% of the thickness of the piezoelectric layer 300. Accordingly, the piezoelectric layer 300 may be separated by unit cuts 330 in one direction and the other by the cutout 330, and may be separated into unit cells, and an elastic layer 400 may be formed between the unit cells.
탄성층(400)은 탄성을 가진 폴리머, 실리콘 등을 이용하여 형성할 수 있다. 압전층(300)이 절개되고 탄성층(400)이 형성되므로 압전층(300)은 탄성층(400)이 형성되지 않은 본 발명의 다른 실시 예에 비해 더 높은 플렉서블 특성을 가질 수 있다. 즉, 압전층(300)에 절개부(330)가 형성되지만 탄성층이 형성되지 않는 경우 압전층(300)의 플렉서블 특성은 제한적일 수 있지만, 압전층(300)이 모두 절개되고 탄성층(400)이 형성됨으로써 압전층(300)을 말 수 있을 정도로 플렉서블 특성을 향상시킬 수 있다. 물론, 탄성층(400)은 압전층(300)의 전체 두께에 절개부(330)가 형성되지 않고 도 4 내지 도 6에 도시된 바와 같이 일부 두께에 형성된 절개부(330)를 충진하도록 형성될 수도 있다.The elastic layer 400 may be formed using an elastic polymer, silicon, or the like. Since the piezoelectric layer 300 is cut and the elastic layer 400 is formed, the piezoelectric layer 300 may have a higher flexibility than other embodiments of the present invention in which the elastic layer 400 is not formed. That is, when the cutout 330 is formed in the piezoelectric layer 300 but the elastic layer is not formed, the flexible property of the piezoelectric layer 300 may be limited, but the piezoelectric layer 300 is cut in all and the elastic layer 400 is formed. By forming this, flexible characteristics can be improved to the extent that the piezoelectric layer 300 can be rolled up. Of course, the elastic layer 400 may be formed to fill the cutout 330 formed at a part thickness as shown in FIGS. 4 to 6 without forming the cutout 330 in the entire thickness of the piezoelectric layer 300. It may be.
도 8은 본 발명의 제 4 실시 예에 따른 압력 센서의 단면도이고, 도 9 및 도 10은 다른 실시 예들에 따른 제 1 및 제 2 전극층의 평면 개략도이다.8 is a cross-sectional view of a pressure sensor according to a fourth embodiment of the present invention, and FIGS. 9 and 10 are schematic top views of first and second electrode layers according to other embodiments.
도 8에 도시된 바와 같이, 본 발명의 제 4 실시 예에 따른 압력 센서는 서로 이격된 제 1 및 제 2 전극층(100, 200)과, 제 1 및 제 2 전극층(100, 200) 사이에 마련되며, 소정 두께를 갖는 판 형상의 압전체(310)가 복수 마련된 압전층(300)을 포함한다. 여기서, 제 1 및 제 2 전극층(100, 200)은 각각 제 1 및 제 2 지지층(110, 210)과, 제 1 및 제 2 지지층(110, 210) 상에 서로 대면하도록 형성된 제 1 및 제 2 전극(120, 220)을 포함할 수 있다. 즉, 제 4 실시 예에 따른 압력 센서는 도 1을 이용하여 설명한 제 1 실시 예에 따른 압력 센서와 동일한 구성을 갖는다. 그런데, 제 1 및 제 2 전극(120, 220)은 도 9에 도시된 바와 같이 제 1 및 제 2 지지층(110, 210) 상에 전체적으로 형성될 수 있다. 즉, 제 1 및 제 2 전극(120, 220)은 도 2 및 도 3에 도시된 바와 같이 소정의 패턴을 갖도록 형성될 수도 있지만, 도 9에 도시된 바와 같이 지지층(110, 210) 상에 전체적으로 형성될 수도 있다. 이러한 형상의 제 1 및 제 2 전극층(100, 200)은 국부적인 영역에서 압력을 검출하기 위해 마련된 압력 센서에 적용될 수 있다. 즉, 하나의 압력 센서를 이용하여 전자기기의 복수의 영역에서 압력을 검출하기 위해서는 도 2 및 도 3에 도시된 바와 같은 소정의 패턴으로 형성된 전극(120, 220)을 이용할 수 있고, 국부적인 영역에서 압력을 검출하기 위해서는 도 9에 도시된 바와 같은 지지층(110, 210) 상에 전체적으로 형성된 전극(120, 220)을 이용할 수 있다.As shown in FIG. 8, the pressure sensor according to the fourth embodiment of the present invention is provided between the first and second electrode layers 100 and 200 spaced apart from each other, and the first and second electrode layers 100 and 200. And a piezoelectric layer 300 having a plurality of plate-shaped piezoelectric bodies 310 having a predetermined thickness. Here, the first and second electrode layers 100 and 200 are formed on the first and second support layers 110 and 210 and the first and second support layers 110 and 210, respectively, to face each other. It may include electrodes 120 and 220. That is, the pressure sensor according to the fourth embodiment has the same configuration as the pressure sensor according to the first embodiment described with reference to FIG. 1. However, the first and second electrodes 120 and 220 may be entirely formed on the first and second support layers 110 and 210 as shown in FIG. 9. That is, although the first and second electrodes 120 and 220 may be formed to have a predetermined pattern as shown in FIGS. 2 and 3, the first and second electrodes 120 and 220 may be formed entirely on the support layers 110 and 210 as shown in FIG. 9. It may be formed. The first and second electrode layers 100 and 200 having such a shape may be applied to a pressure sensor provided to detect pressure in a local region. That is, in order to detect pressure in a plurality of areas of the electronic device using one pressure sensor, the electrodes 120 and 220 formed in a predetermined pattern as shown in FIGS. 2 and 3 may be used, and the local area may be used. In order to detect a pressure in the electrode, the electrodes 120 and 220 formed entirely on the support layers 110 and 210 as shown in FIG. 9 may be used.
또한, 지지층(110, 210) 상에 전체적으로 형성된 전극(120, 220)을 이용하는 경우에도 도 4 내지 도 7에 도시된 바와 같은 형상으로 압전층(300)을 형성할 수 있다. 즉, 도 4 내지 도 6에 도시된 바와 같이 압전층(300)에 소정의 절개부(330)가 형성될 수도 있고, 도 7에 도시된 바와 같이 절개부(330)에 탄성층(400)이 형성될 수도 있다.In addition, even when the electrodes 120 and 220 are formed on the support layers 110 and 210 as a whole, the piezoelectric layer 300 may be formed in a shape as shown in FIGS. 4 to 7. That is, a predetermined cutout 330 may be formed in the piezoelectric layer 300 as shown in FIGS. 4 to 6, and the elastic layer 400 may be formed in the cutout 330 as shown in FIG. 7. It may be formed.
한편, 본 발명에 따른 압력 센서는 소정 영역에 개구(130, 230)가 형성될 수 있다. 즉, 도 10에 도시된 바와 같이 제 1 및 제 2 전극층(100, 200)이 소정의 형상으로 형성되며, 제 1 및 제 2 전극층(100, 200)의 소정 영역에 개구(130, 230)가 형성될 수 있다. 개구(130, 230)는 또 다른 압력 센서 또는 압력 센서와 다른 기능을 갖는 기능부가 삽입될 수 있도록 마련될 수 있다. 이때, 도시되지 않았지만, 압전층(300)에도 제 1 및 제 2 전극층(100, 200)에 형성된 개구와 중첩되는 개구가 형성될 수 있다. 한편, 제 1 및 제 2 전극층(100, 200)은 서로 다른 형상으로 형성될 수도 있다. 즉, 도 10에 도시된 바와 같이 제 1 전극층(100)은 제 1 전극(120)이 제 1 지지층(110) 상에 전체적으로 형성되고, 제 2 전극층(200)은 제 2 전극(220)이 제 2 지지층(210) 상에 소정 간격으로 이격되어 복수 마련될 수 있다. 예를 들어, 제 2 전극(210)은 대략 사각형 형태의 제 1 영역(210a)과, 개구(230)를 사이에 두고 형성된 대략 사각형 형태의 제 2 및 제 3 영역(220b, 220c)와, 대략 사각형 형상으로 형성된 제 4 영역(220d)이 소정 간격 이격되어 형성될 수 있다. 또한, 제 1 지지층(110) 상에 제 1 연결 패턴(140)이 형성되고, 제 2 지지층(210) 상에 제 2 연결 패턴(240)이 형성될 수 있다. 이때, 제 1 연결 패턴(140)은 제 1 전극(110)과 접촉되어 형성되며, 제 2 연결 패턴(240)은 제 4 영역(220d)와 이격되어 형성된다. 또한, 제 1 및 제 2 연결 패턴(140, 240)은 적어도 일부 중첩되도록 형성될 수 있다. 물론, 도시되지 않았지만, 제 1 및 제 2 전극층(100, 200) 사이의 압전층(300)의 적어도 일부에도 제 1 및 제 2 연결 패턴(140, 240) 사이에 제 3 연결 패턴이 형성될 수 있다. 즉, 압전층(300)과 이격되어 제 3 연결 패턴이 형성될 수 있다. 따라서 ,제 1 및 제 2 연결 패턴(140, 240)은 제 3 연결 패턴을 통해 연결될 수 있다. 또한, 제 2 전극층(200)에는 제 1 내지 제 4 영역(210a 내지 210d)으로부터 연장되어 제 1 내지 제 4 연장 패턴(250a, 250b, 250c, 250d)이 각각 형성될 수 있고, 제 2 연결 패턴(240)으로부터 연장되어 제 5 연장 패턴(250e)이 형성될 수 있다. 제 1 내지 제 5 연장 패턴(250a 내지 250d)은 커넥터(미도시)로 연장되어 제어부 또는 전원부와 연결될 수 있다. 따라서, 제 5 연장 패턴(250e)과 제 2 연결 패턴(240) 및 제 3 연결 패턴을 통해 제 1 연결 패턴(140)으로 소정의 전원, 예를 들어 그라운드 전원이 인가될 수 있다. 또한, 제 1 내지 제 4 영역(220a 내지 220d)에 의해 센싱된 전력이 제 1 내지 제 4 연장 패턴(250a 내지 250d)을 통해 커넥터로 전달될 수 있다. 물론, 제 1 내지 제 4 연장 패턴(250a 내지 250d)을 통해 제 1 내지 제 4 영역(220a, 220d)로 소정의 전원, 예를 들어 구동 전원이 인가될 수 있다. Meanwhile, in the pressure sensor according to the present invention, openings 130 and 230 may be formed in a predetermined region. That is, as shown in FIG. 10, the first and second electrode layers 100 and 200 are formed in a predetermined shape, and the openings 130 and 230 are formed in predetermined regions of the first and second electrode layers 100 and 200. Can be formed. The openings 130, 230 may be provided so that another pressure sensor or a functional part having a function different from that of the pressure sensor may be inserted. At this time, although not shown, an opening overlapping the openings formed in the first and second electrode layers 100 and 200 may be formed in the piezoelectric layer 300. Meanwhile, the first and second electrode layers 100 and 200 may be formed in different shapes. That is, as shown in FIG. 10, in the first electrode layer 100, the first electrode 120 is entirely formed on the first support layer 110, and the second electrode layer 200 is formed of the second electrode 220. 2 may be provided on the support layer 210 spaced apart at predetermined intervals. For example, the second electrode 210 may have a substantially rectangular first region 210a, substantially rectangular second and third regions 220b and 220c formed with an opening 230 therebetween, The fourth region 220d formed in a quadrangular shape may be formed to be spaced apart by a predetermined interval. In addition, a first connection pattern 140 may be formed on the first support layer 110, and a second connection pattern 240 may be formed on the second support layer 210. In this case, the first connection pattern 140 is formed in contact with the first electrode 110, and the second connection pattern 240 is formed to be spaced apart from the fourth region 220d. In addition, the first and second connection patterns 140 and 240 may be formed to at least partially overlap. Although not shown, a third connection pattern may be formed between the first and second connection patterns 140 and 240 in at least a portion of the piezoelectric layer 300 between the first and second electrode layers 100 and 200. have. That is, the third connection pattern may be formed to be spaced apart from the piezoelectric layer 300. Therefore, the first and second connection patterns 140 and 240 may be connected through the third connection pattern. In addition, the second electrode layer 200 may extend from the first to fourth regions 210a to 210d to form first to fourth extension patterns 250a, 250b, 250c, and 250d, respectively, and a second connection pattern. The fifth extension pattern 250e may be formed to extend from the 240. The first to fifth extension patterns 250a to 250d may extend with a connector (not shown) to be connected to the control unit or the power supply unit. Accordingly, a predetermined power source, for example, a ground power source, may be applied to the first connection pattern 140 through the fifth extension pattern 250e, the second connection pattern 240, and the third connection pattern. In addition, the power sensed by the first to fourth regions 220a to 220d may be transmitted to the connector through the first to fourth extension patterns 250a to 250d. Of course, a predetermined power source, for example a driving power source, may be applied to the first to fourth regions 220a and 220d through the first to fourth extension patterns 250a to 250d.
상기 실시 예들에 따른 압력 센서는 스마트 폰 등의 전자기기 내에 마련되어 사용자의 터치 또는 압력을 검출할 수 있다. 이러한 본 발명에 실시 예들에 따른 압력 센서를 구비하는 전자기기를 도면을 이용하여 설명하면 다음과 같다.The pressure sensor according to the embodiments may be provided in an electronic device such as a smart phone to detect a user's touch or pressure. Referring to the electronic device having a pressure sensor according to embodiments of the present invention with reference to the drawings as follows.
도 11 및 도 12는 본 발명의 일 실시 예에 따른 압력 센서를 구비하는 전자기기의 전면 사시도 및 후면 사시도이고, 도 13은 도 11의 A-A' 라인을 따라 절취한 일부 단면도이다. 여기서, 본 발명의 실시 예는 압력 센서를 구비하는 전자기기로서 스마트 폰을 포함하는 이동 단말기를 예로 들어 설명하며, 도 11 내지 도 13은 본 발명과 관계된 주요 부분을 개략적으로 도시하였다.11 and 12 are front and rear perspective views of an electronic device including a pressure sensor according to an embodiment of the present invention, and FIG. 13 is a partial cross-sectional view taken along the line AA ′ of FIG. 11. Here, an embodiment of the present invention will be described by taking a mobile terminal including a smart phone as an electronic device having a pressure sensor as an example, and FIGS. 11 to 13 schematically illustrate main parts related to the present invention.
도 11 내지 도 13을 참조하면, 전자기기(1000)는 외관을 이루는 케이스(1100)를 포함하고, 케이스(1100) 내부에 전자기기(1000)의 복수의 기능을 수행하기 위한 복수의 기능 모듈 및 회로 등이 마련된다. 이러한 케이스(1100)는 프론트 케이스(1110), 리어 케이스(1120) 및 배터리 커버(1130)를 포함할 수 있다. 여기서, 프론트 케이스(1110)는 전자기기(1000)의 상부와 측면 일부를 이룰 수 있고, 리어 케이스(1120)는 전자기기(1000)의 측면 일부와 하부를 이룰 수 있다. 즉, 프론트 케이스(1110)의 적어도 일부와 리어 케이스(1120)의 적어도 일부가 전자기기(1000)의 측면을 형성할 수 있고, 프론트 케이스(1110)의 일부가 디스플레이부(1310)를 제외한 상면 일부를 이룰 수 있다. 또한, 배터리 커버(1130)는 리어 케이스(1120) 상에 마련되는 배터리(1200)를 덮도록 마련될 수 있다. 한편, 배터리 커버(1130)는 일체로 마련되거나 착탈 가능하게 마련될 수 있다. 즉, 배터리(1200)가 일체형일 경우 배터리 커버(1130)는 일체로 형성될 수 있고, 배터리(1200)가 착탈 가능할 경우 배터리 커버(1130) 또한 착탈 가능할 수 있다. 물론, 프론트 케이스(1110)와 리어 케이스(1120)가 일체로 제작될 수도 있다. 즉, 프론트 케이스(1110) 및 리어 케이스(1120)의 구분없이 측면 및 후면을 폐쇄하고 상면을 노출시키도록 케이스(1100)가 형성되고, 케이스(1100)의 후면을 커버하도록 배터리 커버(1130)가 마련될 수도 있다. 이러한 케이스(1100)는 적어도 일부가 합성수지를 사출하여 형성되거나 금속 재질로 형성될 수 있다. 즉, 프론트 케이스(1110) 및 리어 케이스(1120)의 적어도 일부가 금속 재질로 형성될 수 있는데, 예를 들어 전자기기(1000)의 측면을 이루는 부분이 금속 재질로 형성될 수 있다. 물론, 배터리 커버(1130) 또한 금속 재질로 형성될 수 있다. 케이스(1100)로 이용되는 금속 재질로는 예를 들어 스테인레스 스틸(STS), 티타늄(Ti), 알루미늄(Al) 등을 포함할 수 있다. 한편, 프론트 케이스(1110)와 리어 케이스(1120)의 사이에 형성된 공간에는 액정표시장치 등의 표시부, 압력 센서, 회로 기판, 햅틱 장치 등 각종 부품이 내장될 수 있다. 11 to 13, the electronic apparatus 1000 includes a case 1100 forming an appearance, and includes a plurality of functional modules for performing a plurality of functions of the electronic apparatus 1000 in the case 1100. A circuit or the like is provided. The case 1100 may include a front case 1110, a rear case 1120, and a battery cover 1130. Here, the front case 1110 may form part of the upper side and the side of the electronic device 1000, and the rear case 1120 may form part of the side surface and the bottom of the electronic device 1000. That is, at least a portion of the front case 1110 and at least a portion of the rear case 1120 may form a side surface of the electronic device 1000, and a portion of the front case 1110 may be part of the upper surface except for the display unit 1310. Can be achieved. In addition, the battery cover 1130 may be provided to cover the battery 1200 provided on the rear case 1120. On the other hand, the battery cover 1130 may be provided integrally or detachably provided. That is, when the battery 1200 is integrated, the battery cover 1130 may be integrally formed. When the battery 1200 is detachable, the battery cover 1130 may also be detachable. Of course, the front case 1110 and the rear case 1120 may be integrally manufactured. That is, the case 1100 is formed to close the side and the rear surface and expose the top surface without distinguishing the front case 1110 and the rear case 1120, and the battery cover 1130 to cover the back of the case 1100. It may be arranged. At least a part of the case 1100 may be formed by injecting synthetic resin or formed of a metal material. That is, at least a part of the front case 1110 and the rear case 1120 may be formed of a metal material, for example, a part of the side surface of the electronic device 1000 may be formed of a metal material. Of course, the battery cover 1130 may also be formed of a metal material. The metal material used for the case 1100 may include, for example, stainless steel (STS), titanium (Ti), aluminum (Al), or the like. Meanwhile, various parts, such as a display unit such as a liquid crystal display, a pressure sensor, a circuit board, and a haptic device, may be embedded in the space formed between the front case 1110 and the rear case 1120.
프론트 케이스(1110)에는 디스플레이부(1310), 음향 출력 모듈(1320), 카메라 모듈(1330a) 등이 배치될 수 있다. 또한, 프론트 케이스(1110) 및 리어 케이스(1120)의 일 측면에는 마이크(1340), 인터페이스(1350) 등이 배치될 수 있다. 즉, 전자기기(1000)의 상면에 디스플레이부(1310), 음향 출력 모듈(1320) 및 카메라 모듈(1330a) 등이 배치되고, 전자기기(1000)의 일 측면, 즉 아래 측면에 마이크(1340), 인터페이스(1350) 등이 배치될 수 있다. 디스플레이부(1310)는 전자기기(1000)의 상면에 배치되어 프론트 케이스(1110)의 상면의 대부분을 차지한다. 즉, 디스플레이부(1310)는 X 및 Y 방향으로 각각 소정의 길이를 갖는 대략 직사각형의 형상으로 마련되며, 전자기기(1000) 상면의 중앙 영역을 포함하여 전자기기(1000) 상면의 대부분의 영역에 형성된다. 이때, 전자기기(1000)의 외곽, 즉 프론트 케이스(1110)의 외곽과 디스플레이부(1310) 사이에는 디스플레이부(1310)가 차지하지 않는 소정의 공간이 마련되는데, X 방향으로 디스플레이부(1310)의 상측에 음향 출력 모듈(1320) 및 카메라 모듈(1330a)이 마련되고, 하측에 전면 입력부(1360)를 포함한 사용자 입력부가 마련될 수 있다. 또한, X 방향으로 연장되는 디스플레이부(1310)의 두 가장자리와 전자기기(1000)의 테두리 사이, 즉 Y 방향으로 디스플레이부(1310)와 전자기기(1000)의 테두리 사이에 베젤 영역이 마련될 수 있다. 물론, 별도의 베젤 영역이 마련되지 않고 디스플레이부(1310)가 Y 방향으로 전자기기(1000)의 테두리까지 확장되어 마련될 수 있다.The front case 1110 may include a display 1310, a sound output module 1320, a camera module 1330a, and the like. In addition, a microphone 1340, an interface 1350, and the like may be disposed at one side of the front case 1110 and the rear case 1120. That is, the display unit 1310, the sound output module 1320, the camera module 1330a, and the like are disposed on the upper surface of the electronic device 1000, and the microphone 1340 is disposed on one side, that is, the lower side, of the electronic device 1000. The interface 1350 may be disposed. The display unit 1310 is disposed on the upper surface of the electronic device 1000 and occupies most of the upper surface of the front case 1110. That is, the display unit 1310 is provided in a substantially rectangular shape having a predetermined length in the X and Y directions, respectively, and includes the central area of the upper surface of the electronic apparatus 1000 in most regions of the upper surface of the electronic apparatus 1000. Is formed. In this case, a predetermined space that is not occupied by the display unit 1310 is provided between the outside of the electronic apparatus 1000, that is, the outside of the front case 1110 and the display unit 1310, and the display unit 1310 in the X direction. An audio output module 1320 and a camera module 1330a may be provided at an upper side thereof, and a user input unit including a front input unit 1360 may be provided at a lower side thereof. In addition, a bezel area may be provided between two edges of the display unit 1310 extending in the X direction and the edge of the electronic device 1000, that is, between the edge of the display unit 1310 and the electronic device 1000 in the Y direction. have. Of course, the display unit 1310 may be extended to the edge of the electronic device 1000 in the Y direction without a separate bezel area.
디스플레이부(1310)는 시각 정보를 출력하고 사용자의 촉각 정보를 입력할 수 있다. 이를 위해 디스플레이부(1310)에는 터치 입력 장치가 마련될 수 있다. 터치 입력 장치는 단말기 바디의 전면을 커버하는 윈도우(2100)와, 시작 정보를 출력하는 예를 들어 액정표시장치 등의 표시부(2200)와, 사용자의 터치 또는 압력 정보를 입력하는 본 발명의 실시 예들의 적어도 어느 하나에 따른 제 1 압력 센서(2300)를 포함할 수 있다. 또한, 터치 입력 장치는 윈도우(2100)와 표시부(2200) 사이에 마련된 터치 센서를 더 포함할 수 있다. 즉, 터치 입력 장치는 터치 센서와 제 1 압력 센서(2300)를 포함할 수 있다. 터치 센서는 예를 들어 소정 두께의 투명한 판 상에 일 방향 및 이와 직교하는 타 방향으로 복수의 전극이 소정 간격 이격되어 형성되고 그 사이에 유전층이 마련되어 사용자의 터치 입력을 검출할 수 있다. 즉, 터치 센서는 복수의 전극이 예를 들어 격자 모양으로 배열되고, 사용자의 터치 입력에 따른 전극 사이의 거리에 따른 정전 용량을 검출할 수 있다. 여기서, 터치 센서는 사용자가 터치하는 수평 방향, 즉 서로 직교하는 X 방향 및 Y 방향의 좌표를 검출하고, 제 1 압력 센서(2300)는 X 방향 및 Y 방향 뿐만 아니라 수직 방향, 즉 Z 방향의 좌표를 검출할 수 있다. 즉, 터치 센서 및 제 1 압력 센서(2300)가 X 방향 및 Y 방향의 좌표를 동시에 검출하고, 제 1 압력 센서(2300)가 Z 방향의 좌표를 더 검출할 수 있다. 이렇게 터치 센서 및 제 1 압력 센서(2300)가 수평 좌표를 동시에 검출하고 제 1 압력 센서(2300)가 수직 좌표를 검출함으로써 사용자의 터치 좌표를 보다 정확하게 검출할 수 있다. The display unit 1310 may output visual information and input tactile information of the user. To this end, the display unit 1310 may be provided with a touch input device. The touch input device may include a window 2100 covering the front surface of the terminal body, a display unit 2200 for outputting start information, for example, a liquid crystal display, and a user's touch or pressure information. It may include a first pressure sensor 2300 according to at least one of them. In addition, the touch input device may further include a touch sensor provided between the window 2100 and the display unit 2200. That is, the touch input device may include a touch sensor and a first pressure sensor 2300. The touch sensor may be formed, for example, on a transparent plate having a predetermined thickness with a plurality of electrodes spaced apart by a predetermined interval in one direction and another direction perpendicular thereto, and a dielectric layer disposed therebetween to detect a user's touch input. That is, the touch sensor may include a plurality of electrodes arranged in a grid shape, for example, and detect capacitance according to a distance between electrodes according to a user's touch input. Here, the touch sensor detects coordinates in the horizontal direction, ie, the X direction and the Y direction, which are touched by the user, and the first pressure sensor 2300 is not only the X and Y directions but also the vertical direction, that is, the coordinates in the Z direction. Can be detected. That is, the touch sensor and the first pressure sensor 2300 may simultaneously detect coordinates in the X direction and the Y direction, and the first pressure sensor 2300 may further detect the coordinates in the Z direction. As such, the touch sensor and the first pressure sensor 2300 simultaneously detect the horizontal coordinates, and the first pressure sensor 2300 detects the vertical coordinates, thereby more accurately detecting the user's touch coordinates.
한편, 프론트 케이스(1110) 상면의 디스플레이부(1310) 이외의 영역에는 음향 출력 모듈(1320), 카메라 모듈(1330a), 전면 입력부(1360) 등이 마련될 수 있다. 이때, 음향 출력 모듈(1320) 및 카메라 모듈(1330a)는 X 방향으로 디스플레이부(1310)의 상측에 마련되고, 전면 입력부(1360) 등의 사용자 입력부는 X 방향으로 디스플레이부(1310)의 하측에 마련될 수 있다. 전면 입력부(1360)는 터치키, 푸쉬키 등으로 구성될 수 있고, 터치 센서 또는 압력 센서를 이용하여 전면 입력부(1350)가 없는 구성도 가능하게 된다. 이때, 전면 입력부(1360)의 하측 내부, 즉 Z 방향으로 전면 입력부(1360) 하측의 케이스(1100) 내부에는 전면 입력부(1360)의 기능을 위한 기능 모듈(3000)이 마련될 수 있다. 즉, 전면 입력부(1360)의 구동 방식에 따라 터치키 또는 푸쉬키의 기능을 수행하는 기능 모듈이 마련될 수 있고, 터치 센서 또는 압력 센서가 마련될 수 있다. 또한, 전면 입력부(1360)는 지문 인식 센서를 포함할 수 있다. 즉, 전면 입력부(1360)를 통해 사용자의 지문을 인식하고 적법한 사용자인지 검출할 수 있고, 이를 위해 기능 모듈(3000)이 지문 인식 센서를 포함할 수 있다. 한편, Y 방향으로 전면 입력부(1360)의 일측 및 타측에는 제 2 압력 센서(2400)가 마련될 수 있다. 사용자 입력부로서 전면 입력부(1360) 양측에 제 2 압력 센서(2400)이 마련됨으로써 사용자의 터치 입력을 검출하여 이전 화면으로 돌아가는 기능 및 디스플레이부(1310)의 화면 설정을 위한 설정 기능을 수행할 수 있다. 이때, 지문 인식 센서를 이용하는 전면 입력부(1360)는 사용자의 지문 인식 뿐만 아니라 초기 화면으로 돌아가는 기능을 수행할 수도 있다. 한편, 디스플레이부(1310)에 접촉되어 압전 진동 장치 등의 햅틱 피드백 장치가 더 마련되어 사용자의 입력 또는 터치에 반응하여 피드백을 제공할 수 있다. 이러한 햅틱 피드백 장치는 디스플레이부(1310) 이외의 전자기기(1000)의 소정 영역에 마련될 수 있다. 예를 들어, 음향 출력 모듈(1310) 외측 영역, 전면 입력부(1360) 외측 영역, 베젤 영역 등에 햅틱 피드백 장치가 마련될 수 있다. 물론, 햅틱 피드백 장치는 디스플레이부(1310) 하측에 마련될 수도 있다.The sound output module 1320, the camera module 1330a, the front input unit 1360, and the like may be provided in an area other than the display unit 1310 on the upper surface of the front case 1110. In this case, the sound output module 1320 and the camera module 1330a are provided above the display unit 1310 in the X direction, and a user input unit such as the front input unit 1360 is positioned below the display unit 1310 in the X direction. Can be prepared. The front input unit 1360 may be configured as a touch key, a push key, or the like, and the front input unit 1350 may be configured by using a touch sensor or a pressure sensor. In this case, a function module 3000 for a function of the front input unit 1360 may be provided inside the case 1100 under the front input unit 1360 in the lower side of the front input unit 1360, that is, in the Z direction. That is, a function module that performs a function of a touch key or a push key may be provided according to the driving method of the front input unit 1360, and a touch sensor or a pressure sensor may be provided. In addition, the front input unit 1360 may include a fingerprint recognition sensor. That is, the front input unit 1360 may recognize the user's fingerprint and detect whether the user is a legitimate user. For this purpose, the function module 3000 may include a fingerprint recognition sensor. Meanwhile, the second pressure sensor 2400 may be provided at one side and the other side of the front input unit 1360 in the Y direction. Since the second pressure sensor 2400 is provided at both sides of the front input unit 1360 as a user input unit, a function of detecting a user's touch input and returning to a previous screen and setting a screen of the display unit 1310 may be performed. . In this case, the front input unit 1360 using the fingerprint sensor may perform a function of returning to the initial screen as well as fingerprint recognition of the user. The haptic feedback device, such as a piezoelectric vibration device, may be further provided in contact with the display unit 1310 to provide feedback in response to a user's input or touch. The haptic feedback device may be provided in a predetermined area of the electronic device 1000 other than the display unit 1310. For example, a haptic feedback device may be provided in an outer region of the sound output module 1310, an outer region of the front input unit 1360, and a bezel region. Of course, the haptic feedback device may be provided under the display unit 1310.
전자기기(1000)의 측면에는 도시되지 않았지만 전원부 및 측면 입력부가 더 마련될 수 있다. 예를 들어, 전원부 및 측면 입력부가 전자기기의 Y 방향으로 서로 대향되는 두 측면에 각각 마련될 수 있고, 일 측면에 서로 이격되어 마련될 수도 있다. 전원부는 전자기기를 온/오프시킬 때 이용될 수 있고, 화면을 인에이블 또는 디스에이블할 때 이용할 수 있다. 또한, 측면 입력부는 음향 출력 모듈(1320)에서 출력되는 음향의 크기 조절 등에 이용할 수 있다. 이때, 전원부 및 측면 입력부는 터치키, 푸쉬키 등으로 구성될 수 있고, 압력 센서로 구성될 수도 있다. 즉, 본 발명에 따른 전자기기는 디스플레이부(1310) 이외의 복수의 영역에 압력 센서가 각각 마련될 수 있다. 예를 들어, 전자기기의 상측의 음향 출력 모듈(1320) 및 카메라 모듈(1330a) 등의 압력 감지, 하측의 전면 입력부(1360)의 압력 제어, 그리고 측면의 전원부 및 측면 입력부 등의 압력을 제어하기 위해 적어도 하나의 압력 센서가 더 마련될 수 있다. Although not shown on the side of the electronic device 1000, a power supply unit and a side input unit may be further provided. For example, the power supply unit and the side input unit may be provided on two sides facing each other in the Y direction of the electronic device, or may be provided spaced apart from each other on one side. The power supply unit may be used to turn on / off the electronic device, and may be used to enable or disable the screen. In addition, the side input unit may be used to adjust the size of the sound output from the sound output module 1320. In this case, the power supply unit and the side input unit may be configured as a touch key, a push key, or may be configured as a pressure sensor. That is, the electronic device according to the present invention may be provided with a pressure sensor in a plurality of areas other than the display unit 1310, respectively. For example, pressure sensing of the upper sound output module 1320 and the camera module 1330a of the electronic device, pressure control of the lower front input unit 1360, and controlling pressure of the side power supply unit and side input unit, etc. At least one pressure sensor may be further provided.
한편, 전자기기(1000)의 후면, 즉 리어 케이스(1120)에는 도 12에 도시된 바와 같이 카메라 모듈(1330b)이 추가로 장착될 수 있다. 카메라 모듈(1330b)은 카메라 모듈(1330a)과 실질적으로 반대되는 촬영 방향을 가지며, 카메라 모듈(1330a)과 서로 다른 화소를 가지는 카메라일 수 있다. 카메라 모듈(1330b)에 인접하게는 플래시(미도시)가 추가로 배치될 수 있다. 또한, 도시되지 않았지만, 카메라 모듈(1330b)의 하측에 지문 인식 센서가 마련될 수 있다. 즉, 전면 입력부(1360)에 지문 인식 센서가 마련되지 않고 전자기기(1000)의 후면에 지문 인식 센서가 마련될 수도 있다.Meanwhile, as illustrated in FIG. 12, a camera module 1330b may be additionally mounted on the rear surface of the electronic apparatus 1000, that is, the rear case 1120. The camera module 1330b has a photographing direction substantially opposite to the camera module 1330a and may be a camera having different pixels from the camera module 1330a. A flash (not shown) may be further disposed adjacent to the camera module 1330b. In addition, although not shown, a fingerprint sensor may be provided below the camera module 1330b. That is, the fingerprint sensor may not be provided at the front input unit 1360, but a fingerprint sensor may be provided at the rear of the electronic device 1000.
배터리(1200)는 리어 케이스(1120)와 배터리 커버(1300) 사이에 마련될 수 있으며, 고정될 수도 있고, 탈착 가능하게 마련될 수도 있다. 이때, 리어 케이스(1120)는 배터리(1200)가 삽입되는 영역을 마련하도록 해당 영역이 오목하게 형성될 수 있고, 배터리(1200)가 장착된 후 배터리 커버(1130)가 배터리(1200) 및 리어 케이스(1120)를 덮도록 마련될 수 있다.The battery 1200 may be provided between the rear case 1120 and the battery cover 1300, may be fixed, or may be detachably provided. In this case, the rear case 1120 may have a concave region formed to provide an area into which the battery 1200 is inserted, and after the battery 1200 is mounted, the battery cover 1130 may cover the battery 1200 and the rear case. It may be provided to cover the 1120.
또한, 도 13에 도시된 바와 같이 전자기기(1000) 내부의 디스플레이부(1310)와 리어 케이스(1130) 사이에 브라켓(1370)이 마련되고, 브라켓(1370) 상측에 윈도우(2100), 표시부(2200) 및 압력 센서(2300)가 마련될 수 있다. 즉, 디스플레이부(1310)의 브라켓(1370) 상측에 본 발명에 따른 터치 입력 장치가 마련될 수 있고, 브라켓(1370)은 터치 입력 장치를 지지한다. 또한, 브라켓(1370)은 디스플레이부(1310) 이외의 영역으로 연장 형성될 수도 있다. 즉, 도 13에 도시된 바와 같이 전면 입력부(1360) 등이 형성된 영역으로 브라켓(1370)이 연장 형성될 수 있다. 또한, 브라켓(1370)의 적어도 일부는 프론트 케이스(1110)의 적어도 일부에 지지될 수 있다. 예를 들어, 디스플레이부(1310)의 외측으로 확장된 브라켓(1370)은 프론트 케이스(1110)로부터 연장된 연장부에 의해 지지될 수 있다. 그리고, 디스플레이부(1310)과 그 외측 사이의 경계 영역의 브라켓(1370) 상에는 소정 높이의 격벽이 형성될 수도 있다. 이러한 브라켓(1370)은 압력 센서(2400)와 지문 인식 센서 등의 기능 모듈(3000) 등을 지지하게 된다. 또한, 도시되지 않았지만, 브라켓(1370) 상에는 압력 센서(2300, 2400), 지문 인식 센서 등의 기능 모듈(3000) 및 터치 센서 등에 전원을 공급하고 이들로부터 출력되는 신호를 입력하여 검출하기 위한 적어도 하나의 구동 수단이 마련된 인쇄회로기판(Printed Circuit Board; PCB) 또는 플렉서블 인쇄회로기판(Flexible Printed Circuit Board; FPCB)이 마련될 수도 있다.In addition, as shown in FIG. 13, a bracket 1370 is provided between the display unit 1310 and the rear case 1130 inside the electronic device 1000, and the window 2100 and the display unit (above the bracket 1370) are provided. 2200 and pressure sensor 2300 may be provided. That is, the touch input device according to the present invention may be provided above the bracket 1370 of the display unit 1310, and the bracket 1370 supports the touch input device. In addition, the bracket 1370 may be extended to an area other than the display unit 1310. That is, as illustrated in FIG. 13, the bracket 1370 may be extended to a region where the front input unit 1360 and the like are formed. In addition, at least a portion of the bracket 1370 may be supported by at least a portion of the front case 1110. For example, the bracket 1370 extended to the outside of the display unit 1310 may be supported by an extension that extends from the front case 1110. In addition, a partition wall having a predetermined height may be formed on the bracket 1370 of the boundary area between the display unit 1310 and the outside thereof. The bracket 1370 supports the function module 3000 such as the pressure sensor 2400 and the fingerprint recognition sensor. In addition, although not shown, at least one for supplying power to a function module 3000 such as pressure sensors 2300 and 2400, a fingerprint recognition sensor, and a touch sensor on the bracket 1370, and inputting and detecting signals outputted from them. A printed circuit board (PCB) or a flexible printed circuit board (FPCB) provided with a driving means may be provided.
상기한 바와 같이 본 발명의 실시 예들에 따른 압력 센서는 전자기기 내의 소정 영역에 적어도 하나 마련될 수 있다. 예를 들어, 상기한 바와 같이 디스플레이부(1310) 및 사용자 입력부에 각각 마련될 수도 있고, 어느 하나 마련될 수도 있다. 그러나, 압력 센서는 전자기기 내의 소정 영역에 적어도 하나 이상 마련될 수 있다. 이렇게 복수의 영역에 압력 센서가 마련될 수 있는 본 발명에 따른 전자기기의 다양한 실시 예를 설명하면 다음과 같다.As described above, at least one pressure sensor may be provided in a predetermined region in the electronic device. For example, as described above, the display unit 1310 and the user input unit may be provided respectively, or any one may be provided. However, at least one pressure sensor may be provided in a predetermined region in the electronic device. Thus, various embodiments of the electronic device according to the present invention, in which a pressure sensor may be provided in a plurality of regions, are as follows.
도 14는 본 발명의 제 2 실시 예에 따른 전자기기의 단면도로서, 디스플레이부(1310)에 마련되는 터치 입력 장치의 단면도이다.14 is a cross-sectional view of an electronic device according to a second embodiment of the present disclosure, which is a cross-sectional view of a touch input device provided in the display unit 1310.
도 14를 참조하면, 본 발명의 제 2 실시 예에 따른 전자기기는 윈도우(2100), 표시부(2200), 압력 센서(2300) 및 브라켓(1370)을 포함한다. Referring to FIG. 14, the electronic device according to the second embodiment of the present invention includes a window 2100, a display unit 2200, a pressure sensor 2300, and a bracket 1370.
윈도우(2100)는 표시부(2200) 상측에 마련되어 프론트 케이스(1310)의 적어도 일부에 의해 지지된다. 또한, 윈도우(2100)는 전자기기의 상면을 이루어 손가락, 스타일러스 펜 등의 객체가 접촉된다. 이러한 윈도우(2100)는 투명 재질로 마련될 수 있는데, 예를 들어 아크릴 수지, 유리 등으로 제작될 수 있다. 한편, 윈도우(2100)은 디스플레이부(1310) 뿐만 아니라 디스플레이부(1310) 외측의 전자기기(1000) 상면에 형성될 수 있다. 즉, 윈도우(2100)는 전자기기(1000)의 상면을 커버하도록 형성될 수 있다.The window 2100 is provided above the display unit 2200 and supported by at least a portion of the front case 1310. In addition, the window 2100 forms an upper surface of the electronic device and contacts an object such as a finger or a stylus pen. The window 2100 may be made of a transparent material, for example, may be made of acrylic resin, glass, or the like. The window 2100 may be formed on the upper surface of the electronic device 1000 outside the display unit 1310 as well as the display unit 1310. That is, the window 2100 may be formed to cover the top surface of the electronic device 1000.
표시부(2200)는 윈도우(2100)를 통해 사용자에게 영상을 표시한다. 이러한 표시부(2200)는 액정표시(Liquid Crystal Display: LCD)패널, 유기발광표시(Organic Light Emitting Display: OLED)패널 등을 포함할 수 있다. 표시부(2200)가 액정표시 패널일 경우 표시부(2200) 하측에는 백라이트 유닛(미도시)이 마련될 수 있다. 백라이트 유닛은 반사 시트, 도광판, 광학 시트 및 광원을 포함할 수 있다. 광원은 발광 다이오드(Light Emitting Diode; LED)가 이용될 수 있다. 이때, 광원은 반사 시트, 도광판, 광학 시트가 적층된 광학 구조물의 하측에 마련될 수도 있고, 측면에 마련될 수도 있다. 액정표시패널의 액정 물질은 백라이트 유닛의 광원에 반응하여 입력되는 신호에 따른 문자 또는 영상 등을 출력한다. 한편, 표시부(2200)와 백라이트 유닛 사이에 차광 테이프(미도시)가 부착되어 빛의 누출을 차단한다. 차광 테이프는 폴리에틸렌 필름의 양 측면에 점착제가 도포된 형태로 구성될 수 있다. 표시부(2200) 및 백라이트 유닛은 차광 테이프의 점착제에 접착되고, 차광 테이프에 삽입된 폴리에틸렌 필름에 의해 백라이트 유닛의 빛은 표시부(2200)의 외부 측으로 새어나오지 못하게 된다. 한편, 백라이트 유닛이 마련되는 경우 압력 센서(2300)는 백라이트 유닛 하측에 마련될 수도 있고, 표시부(2200)와 백라이트 유닛 사이에 마련될 수도 있다.The display unit 2200 displays an image to the user through the window 2100. The display unit 2200 may include a liquid crystal display (LCD) panel, an organic light emitting display (OLED) panel, and the like. When the display unit 2200 is a liquid crystal display panel, a backlight unit (not shown) may be provided below the display unit 2200. The backlight unit may include a reflective sheet, a light guide plate, an optical sheet, and a light source. The light source may be a light emitting diode (LED). In this case, the light source may be provided below the optical structure on which the reflective sheet, the light guide plate, and the optical sheet are stacked, or may be provided on the side surface. The liquid crystal material of the liquid crystal display panel outputs a character or an image according to an input signal in response to the light source of the backlight unit. Meanwhile, a light blocking tape is attached between the display unit 2200 and the backlight unit to block light leakage. The light blocking tape may be formed in a form in which an adhesive is applied to both sides of the polyethylene film. The display unit 2200 and the backlight unit are adhered to the adhesive of the light blocking tape, and the light of the backlight unit is not leaked to the outside of the display unit 2200 by the polyethylene film inserted into the light blocking tape. Meanwhile, when the backlight unit is provided, the pressure sensor 2300 may be provided below the backlight unit, or may be provided between the display unit 2200 and the backlight unit.
압력 센서(2300)는 제 1 및 제 2 전극층(100, 200)과, 제 1 및 제 2 전극층(100, 200) 사이에 마련된 압전층(300)을 포함할 수 있다. 제 1 및 제 2 전극층(100, 200)은 제 1 및 제 2 지지층(110, 210)과, 제 1 및 제 2 지지층(110, 210) 상에 각각 형성되며 도 1 내지 도 9를 이용하여 설명된 형상 중 적어도 어느 하나의 형상을 갖는 제 1 및 제 2 전극(120, 220)을 포함할 수 있다. 이때, 제 1 및 제 2 전극(120, 220)는 압전층(300)을 사이에 두고 서로 대면하도록 마련될 수 있다. 그러나, 제 1 및 제 2 전극(120, 220)은 도 14에 도시된 바와 같이 어느 하나가 압전층(300)과 대면하고 다른 하나는 압전층(300)과 대면하지 않도록 형성될 수 있다. 즉, 제 1 전극층(100)은 제 1 지지층(110)의 하측에 제 1 전극(120)이 형성되어 제 1 전극(120)이 압전층(300)과 대면하지 않도록 형성되고, 제 2 전극층(200)은 제 2 지지층(210)의 하측에 제 2 전극(220)이 형성되어 제 2 전극(220)이 압전층(300)과 대면하도록 형성될 수 있다. 다시 말하면, 하측으로부터 상측으로 제 1 전극(120), 제 1 지지층(110), 압전층(300), 제 2 전극(220) 및 제 2 지지층(210)의 순으로 형성될 수 있다. 또한, 압력 센서(2300)는 최하층 및 최상층에 접착층(410, 420; 400)이 형성될 수 있다. 접착층(410, 420)은 압력 센서(2300)를 표시부(2200)와 브라켓(1370) 사이에 접착 고정시키기 위해 마련될 수 있다. 이러한 접착층(410, 420)은 양면 접착 테이프, 접착 테이프, 접착제 등을 이용할 수 있다. 또한, 제 1 전극층(100)과 접착층(410) 사이에 제 1 절연층(510)이 마련되고, 압전층(300)과 제 2 전극(220) 사이에 제 2 절연층(520)이 마련될 수 있다. 절연층(510, 520; 500)은 탄성력과 복원력을 가진 재료를 이용하여 형성할 수 있다. 예를 들어, 절연층(510, 520)은 경도가 30 이하인 실리콘, 고무, 겔, 테프론테이프, 우레탄을 이용하여 형성할 수 있다. 또한, 절연층(510, 520)에는 복수의 기공이 형성될 수 있다. 기공은 예를 들어 1㎛∼500㎛의 사이즈를 가지며 10%∼95%의 기공률로 형성될 수 있다. 절연층(510, 520) 내에 복수의 기공이 형성됨으로써 절연층(510, 520)의 탄성력과 복원력을 더욱 향상시킬 수 있다. 여기서, 제 1 및 제 2 지지층(110, 210)은 각각 50㎛∼150㎛의 두께로 형성되고, 제 1 및 제 2 전극(120, 220)은 각각 1㎛∼50㎛의 두께로 형성되며, 압전층(300)은 10㎛∼1000㎛의 두께로 형성될 수 있다. 즉, 압전층(300)은 제 1 및 제 2 전극층(100, 200)보다 같거나 두껍게 형성될 수 있고, 제 1 및 제 2 전극층(100, 200)은 동일 두께로 형성될 수 있다. 그러나, 제 1 및 제 2 전극층(100, 200)은 재질 등에 따라 서로 다른 두께로 형성될 수 있는데, 예를 들어 제 2 전극층(200)이 제 1 전극층(100)보다 얇은 두께로 형성될 수 있다. 또한, 제 1 및 제 2 절연층(510, 520)은 각각 3㎛∼500㎛의 두께로 형성되며, 제 1 및 제 2 접착층(410, 420)은 각각 3㎛∼1000㎛의 두께로 형성될 수 있다. 이때, 제 1 및 제 2 절연층(510, 520)은 동일 두께로 형성되며, 제 1 및 제 2 접착층(410, 420)은 동일 두께로 형성될 수 있다. 그러나, 절연층(510, 520)이 서로 다른 두께로 형성되고 접착층(410, 420)이 서로 다른 두께로 형성될 수 있는데, 예를 들어 제 1 접착층(410)이 제 2 접착층(420)보다 두껍게 형성될 수 있다.The pressure sensor 2300 may include the first and second electrode layers 100 and 200, and the piezoelectric layer 300 provided between the first and second electrode layers 100 and 200. The first and second electrode layers 100 and 200 are formed on the first and second support layers 110 and 210 and the first and second support layers 110 and 210, respectively, and will be described with reference to FIGS. 1 to 9. The first and second electrodes 120 and 220 may have at least one of the shapes. In this case, the first and second electrodes 120 and 220 may be provided to face each other with the piezoelectric layer 300 interposed therebetween. However, the first and second electrodes 120 and 220 may be formed such that one of the first and second electrodes 120 and 220 faces the piezoelectric layer 300 and the other does not face the piezoelectric layer 300. That is, the first electrode layer 100 is formed so that the first electrode 120 is formed below the first support layer 110 so that the first electrode 120 does not face the piezoelectric layer 300, and the second electrode layer ( The second electrode 220 may be formed below the second support layer 210 so that the second electrode 220 faces the piezoelectric layer 300. In other words, the first electrode 120, the first support layer 110, the piezoelectric layer 300, the second electrode 220, and the second support layer 210 may be formed in the order from the lower side to the upper side. In addition, the pressure sensor 2300 may have adhesive layers 410, 420 and 400 formed on the lowermost layer and the uppermost layer. The adhesive layers 410 and 420 may be provided to adhesively fix the pressure sensor 2300 between the display unit 2200 and the bracket 1370. The adhesive layers 410 and 420 may use double-sided adhesive tape, adhesive tape, adhesive, or the like. In addition, a first insulating layer 510 is provided between the first electrode layer 100 and the adhesive layer 410, and a second insulating layer 520 is provided between the piezoelectric layer 300 and the second electrode 220. Can be. The insulating layers 510, 520 and 500 may be formed using a material having elasticity and restoring force. For example, the insulating layers 510 and 520 may be formed using silicon, rubber, gel, teflon tape, or urethane having a hardness of 30 or less. In addition, a plurality of pores may be formed in the insulating layers 510 and 520. The pores have a size of, for example, 1 μm to 500 μm and may be formed at a porosity of 10% to 95%. By forming a plurality of pores in the insulating layers 510 and 520, the elastic force and the restoring force of the insulating layers 510 and 520 may be further improved. Here, the first and second support layers 110 and 210 are formed to have a thickness of 50 μm to 150 μm, respectively, and the first and second electrodes 120 and 220 are each formed to have a thickness of 1 μm to 50 μm, The piezoelectric layer 300 may be formed to a thickness of 10 ㎛ to 1000 ㎛. That is, the piezoelectric layer 300 may be formed to be the same or thicker than the first and second electrode layers 100 and 200, and the first and second electrode layers 100 and 200 may be formed to have the same thickness. However, the first and second electrode layers 100 and 200 may be formed to have different thicknesses depending on the material. For example, the second electrode layer 200 may be formed to be thinner than the first electrode layer 100. . In addition, the first and second insulating layers 510 and 520 may each have a thickness of 3 μm to 500 μm, and the first and second adhesive layers 410 and 420 may each have a thickness of 3 μm to 1000 μm. Can be. In this case, the first and second insulating layers 510 and 520 may have the same thickness, and the first and second adhesive layers 410 and 420 may have the same thickness. However, the insulating layers 510 and 520 may be formed in different thicknesses, and the adhesive layers 410 and 420 may be formed in different thicknesses. For example, the first adhesive layer 410 may be thicker than the second adhesive layer 420. Can be formed.
브라켓(1370)은 도 13에 도시된 바와 같이 리어 케이스(1120) 상측에 마련된다. 이러한 브라켓(1370)은 상측의 터치 센서, 표시부(2200) 및 압력 센서(2300)를 지지하며, 객체의 누르는 힘이 분산되지 않도록 한다. 이러한 브라켓(1370)은 형상이 변형되지 않는 물질로 형성될 수 있다. 즉, 브라켓(1370)은 객체의 누르는 힘이 분산되지 않도록 하고, 터치 센서, 표시부(2200), 압력 센서(2300)를 지지하므로 압력에 의해 형상이 변형되지 않는 물질로 형성될 수 있다. 이때, 브라켓(1370)은 도전 물질 또는 절연 물질로 형성될 수 있다. 또한, 브라켓(1370)은 모서리 또는 전체가 벤딩된 구조, 즉 구부러진 구조로 형성될 수 있다. 이렇게 브라켓(1370)이 마련됨으로써 객체의 누르는 힘이 분산되지 않고 집중될 수 있고, 그에 따라 터치 영역을 더욱 정확하게 검출할 수 있다.The bracket 1370 is provided above the rear case 1120 as shown in FIG. 13. The bracket 1370 supports the upper touch sensor, the display unit 2200 and the pressure sensor 2300 and prevents the pressing force of the object from being distributed. The bracket 1370 may be formed of a material whose shape is not deformed. That is, the bracket 1370 may be formed of a material such that the pressing force of the object is not dispersed and the touch sensor, the display unit 2200, and the pressure sensor 2300 are not deformed by pressure. In this case, the bracket 1370 may be formed of a conductive material or an insulating material. In addition, the bracket 1370 may be formed in a corner or whole bent structure, that is, bent structure. As the bracket 1370 is provided, the pressing force of the object may be concentrated without being distributed, and thus the touch area may be detected more accurately.
한편, 압력 센서는 표시부(2200) 하측의 전체 영역에 형성될 수도 있고, 표시부(2200) 하측의 적어도 일부 영역에 형성될 수 있다. 이러한 압력 센서의 배치 형태를 도 15에 도시하였다. 도 15는 본 발명의 제 2 실시 예에 따른 전자기기의 압력 센서의 배치 형상을 도시한 평면 개략도로서, 표시부(2200)를 기준으로 압력 센서(2300)의 배치 형상을 도시하였다.The pressure sensor may be formed in the entire area under the display unit 2200, or may be formed in at least a partial area under the display unit 2200. The arrangement of such a pressure sensor is shown in FIG. 15. FIG. 15 is a plan view schematically illustrating an arrangement shape of a pressure sensor of an electronic device according to a second embodiment of the present disclosure, and illustrates an arrangement shape of the pressure sensor 2300 based on the display unit 2200.
도 15의 (a)에 도시된 바와 같이, 압력 센서(2300)는 표시부(2200)의 가장자리를 따라 마련될 수 있다. 이때, 압력 센서(2300)는 대략 사각형의 표시부(2200) 가장자리, 즉 에지(edge)로부터 소정의 폭으로 마련되며, 소정의 길이로 마련될 수 있다. 즉, 표시부(2200)의 두 장변을 따라 소정 폭의 압력 센서(2300)가 마련되고, 두 단변을 따라 소정 폭의 압력 센서(2300)가 마련될 수 있다. 따라서, 표시부(2200)의 가장자리를 따라 네개의 압력 센서(2300)가 마련될 수 있고, 표시부(2200)의 가장자리의 형상을 따라 하나의 압력 센서(2300)가 마련될 수도 있다. As shown in FIG. 15A, the pressure sensor 2300 may be provided along an edge of the display unit 2200. In this case, the pressure sensor 2300 may be provided at a predetermined width from an edge, that is, an edge of the display unit 2200 having a substantially rectangular shape, and provided at a predetermined length. That is, the pressure sensor 2300 having a predetermined width may be provided along two long sides of the display unit 2200, and the pressure sensor 2300 having a predetermined width may be provided along two short sides. Accordingly, four pressure sensors 2300 may be provided along the edge of the display unit 2200, and one pressure sensor 2300 may be provided along the shape of the edge of the display unit 2200.
도 15의 (b)에 도시된 바와 같이, 표시부(2200)의 가장자리의 소정 폭을 제외한 나머지 영역에 압력 센서(2300)가 마련될 수 있다. As shown in FIG. 15B, the pressure sensor 2300 may be provided in the remaining area except a predetermined width of the edge of the display unit 2200.
도 15의 (c)에 도시된 바와 같이, 표시부(2200)의 인접한 두 변이 만나는 영역, 즉 꼭지점 영역에 압력 센서(2300)가 마련될 수 있다. 즉, 압력 센서(2300)는 표시부(2200)의 네 코너(corner) 영역에 마련될 수 있다. As shown in FIG. 15C, the pressure sensor 2300 may be provided in a region where two adjacent sides of the display unit 2200 meet, that is, a vertex region. That is, the pressure sensor 2300 may be provided at four corner regions of the display unit 2200.
도 15의 (d)에 도시된 바와 같이, 표시부(2200)의 가장자리 영역을 제외한 나머지 영역에 압력 센서(2300)가 마련되고, 압력 센서(2300)가 마련되지 않은 나머지 영역에는 양면 테이프 등의 충진재(2310)가 마련될 수 있다. As shown in FIG. 15D, the pressure sensor 2300 is provided in the remaining area except the edge area of the display unit 2200, and the filling material such as a double-sided tape is provided in the remaining area in which the pressure sensor 2300 is not provided. 2310 may be provided.
도 15의 (e)에 도시된 바와 같이, 표시부(2200) 하측에 복수의 압력 센서(2300)가 대략 등간격으로 마련될 수 있다.As shown in FIG. 15E, a plurality of pressure sensors 2300 may be provided at substantially equal intervals below the display unit 2200.
물론, 도 15의 (a), (c) 및 (d)에서 압력 센서(2300)가 마련되지 않은 영역에 양면 테이프 등의 충진재(2310)가 마련될 수도 있다. Of course, the filler 2310 such as a double-sided tape may be provided in an area where the pressure sensor 2300 is not provided in FIGS. 15A, 15C and 15D.
한편, 본 발명의 제 1 및 제 2 전극층(100, 200)의 어느 하나는 브라켓(1370) 상에 구현될 수 있다. 즉, 브라켓(1370)이 제 1 및 제 2 전극층(100, 200)로 기능할 수 있다. 이 경우 브라켓(1370) 상에 제 1 전극(120) 또는 제 2 전극(220)이 형성될 수 있다. 따라서, 브라켓(1370)이 제 1 전극층(100) 또는 제 2 전극층(200)의 지지층으로 이용될 수 있다. 이러한 본 발명의 제 3 실시 예에 따른 압력 센서를 구비하는 전자기기를 도 16에 도시하였다. 도 16은 브라켓(1370) 상에 제 1 전극(120)이 형성된 경우를 예시하였다. 이때, 도시되지 않았지만, 윈도우(2100)와 표시부(2200) 사이에 터치 센서가 더 마련될 수 있다.Meanwhile, any one of the first and second electrode layers 100 and 200 of the present invention may be implemented on the bracket 1370. That is, the bracket 1370 may function as the first and second electrode layers 100 and 200. In this case, the first electrode 120 or the second electrode 220 may be formed on the bracket 1370. Therefore, the bracket 1370 may be used as the support layer of the first electrode layer 100 or the second electrode layer 200. 16 illustrates an electronic device including a pressure sensor according to a third embodiment of the present invention. FIG. 16 illustrates a case where the first electrode 120 is formed on the bracket 1370. In this case, although not shown, a touch sensor may be further provided between the window 2100 and the display unit 2200.
브라켓(1370)은 제 1 전극층으로 이용될 수 있다. 즉, 브라켓(1370)은 그라운드 전극으로 이용될 수 있다. 이렇게 브라켓(1370)이 제 1 전극층, 즉 그라운드 전극으로 이용되기 위해 브라켓(1370)은 절연 물질로 형성되고 브라켓(1370)에는 제 1 전극(120)이 형성될 수 있다. 이러한 제 1 전극(120)은 소정의 폭 및 간격을 갖도록 일 방향으로 배열될 수 있고, 소정의 패턴으로 형성될 수도 있다. 또한, 제 1 전극(120)은 브라켓(1370) 상에 전체적으로 형성될 수 있다. 이때, 브라켓(1370) 상의 제 1 전극(120)은 제 2 전극층(200)의 제 2 전극(220)과 적어도 일부 중첩되도록 형성된다. 즉, 제 1 전극(120)과 제 2 전극(220) 사이에서 압전층(300)으로부터 예를 들어 전력이 발생되도록 제 1 및 제 2 전극(120, 220)은 중첩되어 형성될 수 있다. 예를 들어, 사용자의 터치 또는 압력 인가에 따라 제 2 전극(220)의 적어도 일부가 압전층(300)의 적어도 일부에 압력을 제공하고 그에 따라 압력이 제공된 압전층(300)으로부터 전력이 발생될 수 있다. 한편, 브라켓(1370) 상에 형성되는 제 1 전극(120)은 투명 도전성 물질로 형성될 수 있다. 그러나, 제 1 전극(120)은 구리, 은, 금 등의 불투명 도전성 물질로 형성될 수도 있다. 이러한 브라켓(1370)은 제 1 전극(120)을 통해 그라운드 전위가 인가될 수 있다. 즉, 제 2 전극층(200)을 통해 소정 전위의 신호가 인가되고 브라켓(1370)을 통해 그라운드 전위가 인가될 수 있다. 따라서, 객체의 터치에 따라 제 2 전극층(200)과 브라켓(1370) 사이의 거리가 기준 거리에 비해 가까워지고 그에 따라 제 2 전극층(200)과 브라켓(1370) 사이의 압전층(300)에서 소정의 전력이 발생될 수 있다.The bracket 1370 may be used as the first electrode layer. That is, the bracket 1370 may be used as a ground electrode. Thus, in order for the bracket 1370 to be used as the first electrode layer, that is, the ground electrode, the bracket 1370 may be formed of an insulating material and the first electrode 120 may be formed in the bracket 1370. The first electrode 120 may be arranged in one direction to have a predetermined width and spacing, or may be formed in a predetermined pattern. In addition, the first electrode 120 may be entirely formed on the bracket 1370. In this case, the first electrode 120 on the bracket 1370 is formed to at least partially overlap the second electrode 220 of the second electrode layer 200. That is, the first and second electrodes 120 and 220 may overlap each other to generate power, for example, from the piezoelectric layer 300 between the first electrode 120 and the second electrode 220. For example, at least a portion of the second electrode 220 may provide pressure to at least a portion of the piezoelectric layer 300 according to a user's touch or application of pressure, thereby generating power from the piezoelectric layer 300 provided with pressure. Can be. Meanwhile, the first electrode 120 formed on the bracket 1370 may be formed of a transparent conductive material. However, the first electrode 120 may be formed of an opaque conductive material such as copper, silver, and gold. The bracket 1370 may be applied with a ground potential through the first electrode 120. That is, a signal having a predetermined potential may be applied through the second electrode layer 200, and a ground potential may be applied through the bracket 1370. Accordingly, the distance between the second electrode layer 200 and the bracket 1370 is closer to the reference distance in response to the touch of the object, and accordingly, the distance between the second electrode layer 200 and the bracket 1370 is predetermined in the piezoelectric layer 300 between the second electrode layer 200 and the bracket 1370. Power may be generated.
한편, 상기 본 발명의 실시 예들은 압력 센서(2300)가 표시부(2200)와 브라켓(1370) 사이에 마련되는 경우를 설명하였다. 그러나, 압력 센서(2300)가 윈도우(2100)와 표시부(2200) 사이에 마련될 수도 있고, 표시부(2200)와 백라이트 유닛 사이에 마련될 수도 있다.On the other hand, the embodiments of the present invention described the case where the pressure sensor 2300 is provided between the display unit 2200 and the bracket 1370. However, the pressure sensor 2300 may be provided between the window 2100 and the display unit 2200, or may be provided between the display unit 2200 and the backlight unit.
또한, 압력 센서는 디스플레이부(1310) 이외의 영역에 마련될 수도 있다. 이때, 적어도 하나의 압력 센서가 디스플레이부(1310) 이외의 영역에 마련될 수 있는데, 이러한 압력 센서의 배치 형태를 도 17에 도시하였다. 도 17은 본 발명의 제 4 실시 예에 따른 전자기기의 압력 센서의 배치 형상을 도시한 평면 개략도로서, 윈도우(2100)를 기준으로 압력 센서(2400)의 배치 형상을 도시하였다.In addition, the pressure sensor may be provided in an area other than the display unit 1310. In this case, at least one pressure sensor may be provided in an area other than the display unit 1310, and the arrangement of the pressure sensor is illustrated in FIG. 17. FIG. 17 is a plan view schematically illustrating an arrangement shape of a pressure sensor of an electronic device according to a fourth embodiment of the present disclosure, and illustrates an arrangement shape of the pressure sensor 2400 based on the window 2100.
도 17의 (a)에 도시된 바와 같이, 압력 센서(2400)는 윈도우(2100)의 가장자리를 따라 마련될 수 있다. 이때, 압력 센서(2400)는 대략 사각형의 윈도우(2100) 가장자리, 즉 에지(edge)로부터 소정의 폭으로 마련되며, 소정의 길이로 마련될 수 있다. 즉, 윈도우(2100)의 두 장변을 따라 소정 폭의 압력 센서(2400)가 마련되고, 두 단변을 따라 소정 폭의 압력 센서(2400)가 마련될 수 있다. 다시 말하면, 압력 센서(2400)는 디스플레이부(1310) 이외의 영역, 즉 디스플레이부(1310)의 상측 및 하측 영역, 그리고 베젤 영역에 마련될 수 있다. 이때, 압력 센서(2400)는 윈도우(2100)의 가장자리를 따라 네개가 마련될 수 있고, 윈도우(2100)의 가장자리의 형상을 따라 하나가 마련될 수도 있다.As shown in FIG. 17A, the pressure sensor 2400 may be provided along an edge of the window 2100. In this case, the pressure sensor 2400 may be provided at a predetermined width from an edge of the substantially rectangular window 2100, that is, an edge, and may be provided at a predetermined length. That is, the pressure sensor 2400 of a predetermined width may be provided along two long sides of the window 2100, and the pressure sensor 2400 of a predetermined width may be provided along two short sides. In other words, the pressure sensor 2400 may be provided in an area other than the display unit 1310, that is, the upper and lower regions of the display unit 1310 and the bezel region. In this case, four pressure sensors 2400 may be provided along the edge of the window 2100, and one may be provided along the shape of the edge of the window 2100.
도 17의 (b)에 도시된 바와 같이, 압력 센서(2400)는 윈도우(2100)의 장변 가장자리를 따라 마련될 수 있다. 즉, 압력 센서(2400)는 디스플레이부(1310)의 가장자리와 전자기기(1000)의 테두리 사이의 영역, 즉 베젤 영역에 마련될 수 있다. As shown in FIG. 17B, the pressure sensor 2400 may be provided along the long edge of the window 2100. That is, the pressure sensor 2400 may be provided in an area between the edge of the display unit 1310 and the edge of the electronic device 1000, that is, the bezel area.
도 17의 (c)에 도시된 바와 같이, 윈도우(2100)의 인접한 두 변이 만나는 영역, 즉 꼭지점 영역에 압력 센서(2400)가 마련될 수 있다. 즉, 압력 센서(2400)는 윈도우(2100)의 네 코너(corner) 영역에 마련될 수 있다.As illustrated in FIG. 17C, the pressure sensor 2400 may be provided in a region where two adjacent sides of the window 2100 meet, that is, a vertex region. That is, the pressure sensor 2400 may be provided at four corner regions of the window 2100.
도 17의 (d)에 도시된 바와 같이, 압력 센서(2400)는 윈도우(2100)의 단변 가장자리를 따라 마련될 수 있다.As shown in FIG. 17D, the pressure sensor 2400 may be provided along the short side edge of the window 2100.
도 17의 (d)에 도시된 바와 같이, 복수의 압력 센서(2400)가 윈도우(2100)의 장변 및 단변 가장자리를 따라 소정 간격 이격되어 마련될 수 있다. 이때, 복수의 압력 센서(2400)는 대략 등간격으로 마련될 수 있다. As shown in FIG. 17D, a plurality of pressure sensors 2400 may be provided at predetermined intervals along the long side and short side edges of the window 2100. In this case, the plurality of pressure sensors 2400 may be provided at approximately equal intervals.
도 17의 (e)에 도시된 바와 같이, 윈도우(2100)의 네 코너 영역에 압력 센서(2400)가 각각 마련되고, 압력 센서(2400) 사이의 영역, 즉 윈도우(2100)의 장변 및 단변 가장자리 영역에는 접착 테이프 등의 충진재(2410)이 마련될 수 있다.As shown in FIG. 17E, pressure sensors 2400 are provided at four corner regions of the window 2100, respectively, and the area between the pressure sensors 2400, that is, the long side and short side edges of the window 2100. The region may be provided with a filler 2410 such as an adhesive tape.
도 18은 본 발명의 일 실시 예에 따른 압력 센서의 제어 구성도로서, 제 1 및 제 2 압력 센서(2300, 2400)를 포함하는 압력 센서의 제어 구성도이다.18 is a control configuration diagram of a pressure sensor according to an embodiment of the present disclosure, and is a control configuration diagram of a pressure sensor including first and second pressure sensors 2300 and 2400.
도 18을 참조하면, 본 발명의 일 실시 예에 따른 압력 센서의 제어 구성은 제 1 압력 센서(2300) 및 제 2 압력 센서(2400)의 적어도 어느 하나의 구동을 제어하는 제어부(2500)를 포함할 수 있다. 제어부(2500)는 구동부(2510), 검출부(2520), 변환부(2530) 및 연산부(2540)를 포함할 수 있다. 이때, 구동부(2510), 검출부(2520), 변환부(2530) 및 연산부(2540)를 포함하는 제어부(2500)는 하나의 집적 회로(IC)로 구현될 수 있다. 따라서, 적어도 하나의 압력 센서(2300, 2400)의 출력을 하나의 집적 회로(IC)를 이용하여 처리할 수 있다.Referring to FIG. 18, a control configuration of a pressure sensor according to an embodiment of the present disclosure includes a controller 2500 for controlling at least one driving of the first pressure sensor 2300 and the second pressure sensor 2400. can do. The controller 2500 may include a driver 2510, a detector 2520, a converter 2530, and a calculator 2540. In this case, the controller 2500 including the driver 2510, the detector 2520, the converter 2530, and the calculator 2540 may be implemented as one integrated circuit (IC). Accordingly, the output of the at least one pressure sensor 2300 and 2400 may be processed using one integrated circuit IC.
구동부(2510)는 적어도 하나의 압력 센서(2300, 2400)에 구동 신호를 인가한다. 즉, 구동부(2510)은 제 1 압력 센서(2300) 및 제 2 압력 센서(2400)에 구동 신호를 인가하거나, 제 1 압력 센서(2300) 또는 제 2 압력 센서(2400)에 구동 신호를 인가할 수 있다. 이를 위해, 구동부(2510)는 제 1 압력 센서(2300)를 구동시키기 위한 제 1 구동부와, 제 2 압력 센서(2400)를 구동하기 위한 제 2 구동부를 포함할 수 있다. 그러나, 구동부(2510)는 하나로 구성되어 제 1 및 제 2 압력 센서(2300, 2400)에 구동 신호를 인가할 수 있다. 즉, 하나의 구동부(2510)가 제 1 및 제 2 압력 센서(2300, 2400)에 구동 신호를 각각 인가할 수 있다. 제 1 및 제 2 압력 센서(2300, 2400)이 각각 복수로 구성되는 경우 구동부(2510)가 복수의 압력 센서(2300, 2400)에 구동 신호를 인가할 수 있다. 또한, 구동부(2510)로부터의 구동 신호는 제 1 및 제 2 압력 센서(2300, 2400)를 구성하는 제 1 및 제 2 전극(120, 220)의 어느 하나에 인가될 수 있다. 예를 들어, 구동부(2510)은 제 1 전극(120)에 예를 들어 그라운드 전압을 인가할 수 있다. 물론, 구동부(2510)은 제 2 전극(220)에 소정의 구동 신호를 인가할 수도 있다. 이때, 제 1 및 제 2 압력 센서(2300, 2400)에 인가되는 구동 신호는 서로 동일할 수 있고, 서로 다를 수도 있다. 구동 신호는 소정의 주기와 진폭을 갖는 구형파(Square Wave), 사인파(Sine Wave), 삼각파(Triangle Wave) 등일 수 있으며, 복수의 제 1 전극(220) 각각에 순차적으로 인가될 수 있다. 물론, 구동부(2510)는 복수의 제 1 전극(220)에 동시에 구동 신호를 인가하거나, 복수의 제 1 전극(220) 중에서 일부에만 선택적으로 구동 신호를 인가할 수도 있다.The driver 2510 applies a driving signal to at least one pressure sensor 2300 and 2400. That is, the driver 2510 may apply a driving signal to the first pressure sensor 2300 and the second pressure sensor 2400 or may apply a driving signal to the first pressure sensor 2300 or the second pressure sensor 2400. Can be. To this end, the driver 2510 may include a first driver for driving the first pressure sensor 2300 and a second driver for driving the second pressure sensor 2400. However, the driving unit 2510 may be configured as one to apply driving signals to the first and second pressure sensors 2300 and 2400. That is, one driving unit 2510 may apply driving signals to the first and second pressure sensors 2300 and 2400, respectively. When the first and second pressure sensors 2300 and 2400 are configured in plural, the driving unit 2510 may apply a driving signal to the plurality of pressure sensors 2300 and 2400. In addition, the driving signal from the driver 2510 may be applied to any one of the first and second electrodes 120 and 220 constituting the first and second pressure sensors 2300 and 2400. For example, the driver 2510 may apply a ground voltage to the first electrode 120, for example. Of course, the driver 2510 may apply a predetermined driving signal to the second electrode 220. In this case, the driving signals applied to the first and second pressure sensors 2300 and 2400 may be identical to each other or may be different from each other. The driving signal may be a square wave, a sine wave, a triangle wave, or the like having a predetermined period and amplitude, and may be sequentially applied to each of the plurality of first electrodes 220. Of course, the driver 2510 may simultaneously apply a driving signal to the plurality of first electrodes 220 or selectively apply only a portion of the plurality of first electrodes 220 to the driving signal.
검출부(2520)는 압력 센서(2300, 2400)의 출력 신호를 검출한다. 예를 들어, 제 1 전극(120)에 그라운드 전위가 인가되고 사용자의 터치에 의해 적어도 일 영역의 제 2 전극(220)으로부터 압전층(300)에 압력이 인가되면 해당 영역의 압전층(300)으로부터 소정의 전력이 발생된다. 따라서, 검출부(2520)는 압력 센서(2300, 2400)의 소정 영역, 예를 들어 제 2 전극(220) 또는 압전층(300)으로부터 출력되는 전력을 검출하여 압력을 검출하게 된다. 여기서, 검출부(2520)는 제 1 및 제 2 압력 센서(2300, 2400)의 전력을 각각 검출하기 위한 제 1 및 제 2 검출부를 포함할 수 있다. 그러나, 하나의 검출부(2520)가 제 1 및 제 2 압력 센서(2300, 2400)의 전력을 모두 검출할 수 있고, 이를 위해 검출부(2520)는 제 1 및 제 2 압력 센서(2300, 2400)의 전력을 순차적으로 검출할 수 있다. 이렇게 검출부(2520)는 압력 센서(2300, 2400)의 전력을 검출하여 터치되는 영역과 그 영역의 압력을 검출할 수 있다. 예를 들어, 사용자가 손가락으로 터치하는 경우 손가락의 중심이 접촉되어 압력이 가장 크게 전달되는 중심 영역과 그 주변에 그보다 적은 압력이 전달되는 주변 영역이 있을 수 있다. 중심 영역은 사용자의 터치 압력이 가장 크게 전달되고 그에 따라 압전층(300)에 인가되는 압력이 크고, 주변 영역은 중심 영역에 비해 압전층(300)에 인가되는 압력이 작게 되어 중심 영역으로부터 출력되는 전력은 주변 영역에 비해 크게 된다. 따라서, 복수의 영역으로부터 출력되는 전력을 검출하고 이를 비교함으로써 압력이 가장 크게 전달된 중심 영역과 그보다 작은 압력이 전달된 주변 영역을 검출할 수 있고, 결과적으로 사용자가 터치하고자 하는 영역을 중심 영역으로 판단하여 검출할 수 있다. 물론, 사용자가 터치하지 않는 영역은 주변 영역보다 낮은 전력을 출력하거나 전력을 출력하지 않을 수 있다. 한편, 이러한 검출부(2520)는 적어도 하나의 연산 증폭기와 적어도 하나의 캐패시터를 각각 구비하는 복수의 C-V 컨버터(미도시)를 포함할 수 있으며, 복수의 C-V 컨버터는 제 1 및 제 2 압력 센서(2300, 2400)의 복수의 제 2 전극(220)과 각각 연결될 수 있다. 복수의 C-V 컨버터는 아날로그 신호로 변환하여 출력할 수 있는데, 이를 위해 예를 들어 복수의 C-V 컨버터 각각은 적분 회로를 포함할 수 있다. 한편, 구동부(2510)로부터 복수의 제 2 전극에 구동 신호를 순차적으로 인가하는 경우, 복수의 제 1 전극으로부터 전력을 검출할 수 있으므로, C-V 컨버터는 복수의 제 1 전극의 개수만큼 구비될 수 있다.The detector 2520 detects output signals of the pressure sensors 2300 and 2400. For example, when a ground potential is applied to the first electrode 120 and a pressure is applied to the piezoelectric layer 300 from at least one region of the second electrode 220 by a user's touch, the piezoelectric layer 300 of the corresponding region is applied. From the predetermined power is generated. Accordingly, the detector 2520 detects a pressure by detecting power output from a predetermined region of the pressure sensors 2300 and 2400, for example, the second electrode 220 or the piezoelectric layer 300. Here, the detector 2520 may include first and second detectors for detecting power of the first and second pressure sensors 2300 and 2400, respectively. However, one detector 2520 may detect the power of both the first and second pressure sensors 2300 and 2400, and for this purpose, the detector 2520 may be configured to detect the power of the first and second pressure sensors 2300 and 2400. Power can be detected sequentially. In this way, the detector 2520 may detect the power of the pressure sensors 2300 and 2400 to detect the touched region and the pressure of the region. For example, when a user touches with a finger, there may be a center region where the center of the finger is in contact so that the pressure is most transmitted, and a peripheral region where less pressure is transmitted around the center region. In the center region, the touch pressure of the user is most transmitted, and accordingly, the pressure applied to the piezoelectric layer 300 is large, and the peripheral region is output from the center region because the pressure applied to the piezoelectric layer 300 is smaller than that of the center region. Power is greater than the surrounding area. Therefore, by detecting and comparing the power output from the plurality of areas, it is possible to detect the center area where the pressure is most transmitted and the peripheral area where the pressure is less than that, and as a result, the area the user wants to touch as the center area. Judgment can be detected. Of course, the area that the user does not touch may output power lower than the peripheral area or may not output power. Meanwhile, the detector 2520 may include a plurality of CV converters (not shown) each having at least one operational amplifier and at least one capacitor, and the plurality of CV converters may include first and second pressure sensors 2300. And a plurality of second electrodes 220 of 2400. The plurality of C-V converters may convert an analog signal and output the analog signal. For this purpose, each of the plurality of C-V converters may include an integration circuit. Meanwhile, when the driving signals are sequentially applied to the plurality of second electrodes from the driver 2510, power may be detected from the plurality of first electrodes, and thus the CV converter may be provided with the number of the plurality of first electrodes. .
변환부(2530)는 검출부(2520)로부터 출력되는 아날로그 신호를 디지털 신호로 변환시켜 검출 신호를 생성한다. 예를 들어, 변환부(2530)는 검출부(2520)가 출력하는 아날로그 신호가 소정의 기준 레벨까지 도달하는 시간을 측정하여 이를 디지털 신호인 검출 신호로 변환하는 TDC(Time-to-Digital Converter) 회로 또는 검출부(2520)로부터 출력되는 아날로그 신호의 레벨이 소정 시간 동안 변화하는 양을 측정하여 이를 디지털 신호인 검출 신호로 변환하는 ADC(Analog-to-Digital Converter) 회로를 포함할 수 있다.The converter 2530 converts the analog signal output from the detector 2520 into a digital signal to generate a detection signal. For example, the converter 2530 measures a time at which the analog signal output from the detector 2520 reaches a predetermined reference level and converts it into a detection signal that is a digital signal. Or it may include an analog-to-digital converter (ADC) circuit for measuring the amount of change in the level of the analog signal output from the detector 2520 for a predetermined time and converts it to a detection signal which is a digital signal.
연산부(2540)는 검출 신호를 이용하여 제 1 및 제 2 압력 센서(2300, 2400)에 인가된 접촉 입력을 판단한다. 검출 신호를 이용하여 제 1 및 제 2 압력 센서(2300, 2400)에 인가된 터치 입력의 개수, 좌표 및 압력을 판단할 수 있다. 연산부(2540)가 터치 입력을 판단하는데 기초가 되는 검출 신호는 압전층(300)으로부터 출력되는 전력의 변화를 수치화한 데이터일 수 있으며, 특히 터치 입력이 발생하지 않은 경우와 터치 입력이 발생한 경우의 전력의 차이를 나타내는 데이터일 수 있다. The calculator 2540 determines contact inputs applied to the first and second pressure sensors 2300 and 2400 using the detection signal. The number, coordinates, and pressure of the touch inputs applied to the first and second pressure sensors 2300 and 2400 may be determined using the detection signal. The detection signal on which the calculator 2540 determines the touch input may be data obtained by quantifying a change in power output from the piezoelectric layer 300. In particular, when the touch input does not occur and the touch input occurs, the detection signal may be numeric. It may be data representing a difference in power.
이렇게 제어부(2500)를 이용하여 제 1 및 제 2 압력 센서(2300, 2400)의 터치 입력을 판단하고, 이를 전자기기 등의 호스트(4000)의 예를 들어 메인 제어부에 전달할 수 있다. 즉, 제어부(2500)는 검출부(2520), 변환부(2530) 및 연산부(2540) 등을 이용하여 압력 센서(2300, 2400)로부터 입력된 신호를 이용하여 X, Y 좌표 데이터 및 Z 압력 데이터를 생성한다. 이렇게 생성된 X, Y 좌표 데이터 및 Z 압력 데이터는 호스트(4000)로 전달되며, 호스트(4000)는 예를 들어 메인 콘트롤러를 이용하여 X, Y 좌표 데이터 및 Z 압력 데이터를 이용하여 해당 부분의 터치 및 압력을 검출한다.In this way, the touch input of the first and second pressure sensors 2300 and 2400 may be determined using the controller 2500, and the touch input may be transmitted to, for example, the main controller of the host 4000 such as an electronic device. That is, the controller 2500 uses the detector 2520, the converter 2530, the calculator 2540, and the like to obtain X, Y coordinate data and Z pressure data using signals input from the pressure sensors 2300 and 2400. Create The generated X, Y coordinate data and Z pressure data are transferred to the host 4000, and the host 4000 touches the corresponding part using the X, Y coordinate data and the Z pressure data using, for example, the main controller. And pressure.
또한, 제어부(2500)는 제 1 압력 센서(2300)의 출력을 처리하는 제 1 제어부(2500a)와, 제 2 압력 센서(2400)의 출력을 처리하는 제 2 제어부(2500b)를 포함할 수 있다. 즉, 도 18은 제 1 및 제 2 압력 센서(2300, 2400)의 출력을 처리하는 하나의 제어부(2500)를 설명하였으나, 제어부(2500)는 도 19에 도시된 바와 같이 제 1 및 제 2 압력 센서(2300, 2400)의 출력을 각각 처리하는 제 1 및 제 2 제어부(2500a, 2500b)를 포함할 수 있다. 여기서, 제 1 제어부(2500a)는 제 1 구동부(2510a), 제 1 검출부(2520a), 제 1 변환부(2530a) 및 제 1 연산부(2540a)를 포함할 수 있고, 제 2 제어부(2500b)는 제 2 구동부(2510b), 제 2 검출부(2520b), 제 2 변환부(2530b) 및 제 2 연산부(2540b)를 포함할 수 있다. 한편, 제 1 및 제 2 제어부(2500a, 2500b)는 서로 다른 집적 회로(IC)에 각각 구현될 수 있다. 따라서, 제 1 및 제 2 압력 센서(2300, 2400)의 출력을 처리하기 위해 두개의 집적 회로가 필요할 수 있다. 그러나, 제 1 및 제 2 제어부(2500a, 2500b)가 하나의 집적 회로(IC)에 각각 구현될 수도 있다. 이들 제 1 및 제 2 제어부(2500a, 2500b)의 구성 및 기능은 제 1 및 제 2 압력 센서(2300, 2400)의 출력을 각각 나누어 처리하고 도 18을 이용하여 설명한 바와 동일하므로 상세한 설명은 생략하기로 한다.In addition, the controller 2500 may include a first controller 2500a that processes the output of the first pressure sensor 2300 and a second controller 2500b that processes the output of the second pressure sensor 2400. . That is, although FIG. 18 has described one control unit 2500 that processes the outputs of the first and second pressure sensors 2300 and 2400, the control unit 2500 may have the first and second pressures as shown in FIG. 19. The first and second controllers 2500a and 2500b may respectively process the outputs of the sensors 2300 and 2400. Here, the first controller 2500a may include a first driver 2510a, a first detector 2520a, a first converter 2530a, and a first calculator 2540a, and the second controller 2500b may include The second driver 2510b, the second detector 2520b, the second converter 2530b, and the second calculator 2540b may be included. The first and second controllers 2500a and 2500b may be implemented in different integrated circuits IC, respectively. Thus, two integrated circuits may be needed to process the outputs of the first and second pressure sensors 2300 and 2400. However, the first and second controllers 2500a and 2500b may be implemented in one integrated circuit IC, respectively. The configuration and function of the first and second control units 2500a and 2500b are the same as those described above with reference to FIG. 18 by dividing the outputs of the first and second pressure sensors 2300 and 2400, respectively, and thus, detailed descriptions thereof will be omitted. Shall be.
한편, 전자기기가 제 1 및 제 2 압력 센서(2300, 2400)의 적어도 하나 이외에 터치 센서를 더 구비할 수도 있다. 이 경우 터치 센서의 구동은 도 20에 도시된 바와 같이 하나의 제어부(2500)에 의해 이루어질 수 있다. 즉, 하나의 제어부(2500)가 제 1 및 제 2 압력 센서(2300, 2400)이 적어도 하나와 터치 센서(5000)를 제어할 수 있다. 또한, 터치 센서(5000)를 더 구비하는 경우 도 21에 도시된 바와 같이 제 1 및 제 2 압력 센서(2300, 2400)를 제어하기 위한 제 1 및 제 2 제어부(2500a, 2500b)에 더하여 제 3 제어부(2500c)가 더 마련될 수 있다. 즉, 제 1 및 제 2 압력 센서(2300, 2400) 및 터치 센서(5000)를 각각 제어하기 위해 복수의 제어부가 마련될 수 있다.Meanwhile, the electronic device may further include a touch sensor in addition to at least one of the first and second pressure sensors 2300 and 2400. In this case, the driving of the touch sensor may be performed by one controller 2500 as shown in FIG. 20. That is, one controller 2500 may control at least one of the first and second pressure sensors 2300 and 2400 and the touch sensor 5000. In addition, when the touch sensor 5000 is further provided, as shown in FIG. 21, the third and second controllers 2500a and 2500b for controlling the first and second pressure sensors 2300 and 2400 may be added to the third sensor. The controller 2500c may be further provided. That is, a plurality of controllers may be provided to control the first and second pressure sensors 2300 and 2400 and the touch sensor 5000, respectively.
도 22는 본 발명의 다른 실시 예에 따른 압력 센서의 데이터 처리 방법을 설명하기 위한 블럭도이다.FIG. 22 is a block diagram illustrating a data processing method of a pressure sensor according to another exemplary embodiment.
도 22에 도시된 바와 같이, 본 발명의 다른 실시 예에 따른 압력 센서의 데이터를 처리하기 위해 제 1 제어부(2600)와, 저장부(2700) 및 제 2 제어부(2800)를 포함할 수 있다. 이러한 구성은 동일 IC에 구성될 수도 있고, 다른 IC에 구성될 수도 있다. 또한, 본 발명의 데이터 처리는 제 1 제어부(2600)와 제 2 제어부(2800)가 연동하여 이루어질 수 있다. 여기서, 제 1 및 제 2 제어부(2600, 2800)는 각각 압력 센서의 데이터를 처리하기 위한 것일 수 있다. 또한, 제 1 및 제 2 제어부(2600, 2800) 중 어느 하나(예를 들어 제 1 제어부)가 터치 센서를 제어하기 위한 제어부이고, 다른 하나(예를 들어 제 2 제어부)가 압력 센서를 제어하기 위한 제어부일 수 있다. 이 경우 터치 센서를 제어하기 위한 제어부는 터치 센서의 제어와 동시에 압력 센서를 제어할 수 있다. 그리고, 저장부(2700)는 제 1 제어부(2600) 및 제 2 제어부(2800)의 데이터 이동 경로가 되는 동시에 제 1 및 제 2 제어부(2600, 2800)의 데이터를 저장하는 역할을 한다.As illustrated in FIG. 22, a first controller 2600, a storage 2700, and a second controller 2800 may be included to process data of a pressure sensor according to another exemplary embodiment. Such a configuration may be configured in the same IC or may be configured in another IC. In addition, the data processing of the present invention may be performed in conjunction with the first control unit 2600 and the second control unit 2800. Here, the first and second control units 2600 and 2800 may be for processing data of the pressure sensor, respectively. In addition, any one of the first and second control units 2600 and 2800 (for example, the first control unit) is a control unit for controlling the touch sensor, and the other (for example, the second control unit) controls the pressure sensor. It may be a control unit for. In this case, the controller for controlling the touch sensor may control the pressure sensor simultaneously with the control of the touch sensor. The storage unit 2700 serves as a data movement path between the first control unit 2600 and the second control unit 2800 and also stores data of the first and second control units 2600 and 2800.
도 22에 도시된 바와 같이, 제 1 제어부(2600)는 압력 센서를 스캐닝하고 압력 센서의 로 데이터(raw data)를 저장부(2700)에 저장한다. 제 2 제어부(2800)는 저장부(2700)로부터 로 데이터를 입력하여 압력 센서 데이터를 처리하고, 그 결과 값을 저장부(2700)에 저장한다. 저장부(2700)에 저장되는 결과 값은 Z축, 상태 등의 데이터를 포함할 수 있다. 제 1 제어부(2600)는 저장부(2700)로부터 압력 센서의 결과값을 읽어온 후 이벤트 발생 시 인터럽트를 발생하여 호스트에 전송한다.As shown in FIG. 22, the first control unit 2600 scans the pressure sensor and stores raw data of the pressure sensor in the storage unit 2700. The second controller 2800 inputs raw data from the storage 2700 to process the pressure sensor data, and stores the result value in the storage 2700. The result value stored in the storage unit 2700 may include data such as a Z axis and a state. The first controller 2600 reads the result of the pressure sensor from the storage 2700 and generates an interrupt when an event occurs and transmits the interrupt to the host.
한편, 도 11 내지 도 13을 이용하여 설명한 바와 같이 전자기기(1000)의 전면 입력부(1360)이 지문 인식 센서로 이루어질 수 있는데, 지문 인식 센서는 본 발명에 따른 압력 센서를 이용할 수도 있다. 이러한 본 발명의 실시 예들에 따른 압력 센서를 이용한 지문 인식 센서의 구성도를 도 23에 도시하였다. 또한, 도 24는 본 발명의 다른 실시 예에 따른 압력 센서의 단면도이다.Meanwhile, as described with reference to FIGS. 11 to 13, the front input unit 1360 of the electronic apparatus 1000 may be a fingerprint sensor, and the fingerprint sensor may use the pressure sensor according to the present invention. 23 is a block diagram of a fingerprint recognition sensor using a pressure sensor according to embodiments of the present invention. 24 is a cross-sectional view of a pressure sensor according to another embodiment of the present invention.
도 23을 참조하면, 본 발명의 실시 예들에 따른 압력 센서를 이용한 지문 인식 센서는 압력 센서(2300)와, 압력 센서(2300)와 전기적으로 연결되어 지문을 감지하는 지문 감지부(6000)를 포함할 수 있다. 또한, 지문 감지부(6000)는 신호 생성부(6100), 신호 감지부(6200) 및 연산부(6300) 등을 포함할 수 있다.Referring to FIG. 23, a fingerprint recognition sensor using a pressure sensor according to embodiments of the present disclosure includes a pressure sensor 2300 and a fingerprint detector 6000 electrically connected to the pressure sensor 2300 to detect a fingerprint. can do. In addition, the fingerprint detector 6000 may include a signal generator 6100, a signal detector 6200, a calculator 6300, and the like.
한편, 압력 센서(2300)는 도 24에 도시된 바와 같이 손가락이 놓여지는 면에 보호 코팅으로서 보호층(500)이 더 형성될 수 있다. 보호층(500)은 우레탄 또는 보호 코팅으로 작용할 수 있는 또 다른 플라스틱으로 제조 가능하다. 보호층(500)은 접착제를 사용하여 제 2 전극층(200)에 부착된다. 또한, 압력 센서(100)는 압력 센서(1000) 내부에서 지지대로서 이용될 수 있는 지지층(600)을 더 포함할 수 있다. 지지층(600)은 테프론(Teflon) 등으로 제조 가능하다. 물론, 지지층(600)은 테프론 대신에 다른 형태의 지지 재료를 이용할 수 있다. 지지층(600)은 접착제를 이용하여 제 1 전극층(100)에 부착될 수 있다. 한편, 본 발명의 압력 센서(1000)는 압전층(300)이 도 4에 도시된 바와 같이 절개부(330)에 의해 일 방향 및 타 방향으로 소정 간격 이격되어 마련될 수 있고, 도 7에 도시된 바와 같이 절개부(3300)에 탄성층(400)이 형성될 수 있다. 이때, 탄성층(400)이 형성됨으로써 각각의 진동이 서로 영향을 미치지 않도록 하는 것이 바람직하다.Meanwhile, the pressure sensor 2300 may further include a protective layer 500 as a protective coating on a surface on which a finger is placed, as shown in FIG. 24. The protective layer 500 can be made of urethane or another plastic that can act as a protective coating. The protective layer 500 is attached to the second electrode layer 200 using an adhesive. In addition, the pressure sensor 100 may further include a support layer 600 that may be used as a support in the pressure sensor 1000. The support layer 600 may be made of Teflon or the like. Of course, the support layer 600 may use other types of support materials instead of Teflon. The support layer 600 may be attached to the first electrode layer 100 using an adhesive. Meanwhile, in the pressure sensor 1000 of the present invention, the piezoelectric layer 300 may be provided at predetermined intervals in one direction and the other direction by the cutout 330 as illustrated in FIG. 4, and illustrated in FIG. 7. As described above, the elastic layer 400 may be formed in the cutout 3300. At this time, the elastic layer 400 is formed so that each vibration does not affect each other.
지문 감지부(6000)는 압력 센서(2300)의 압전층(300)의 상하부에 마련된 제 1 및 제 2 전극(110, 210)과 각각 연결될 수 있다. 지문 감지부(6000)는 제 1 및 제 2 전극(110, 210)에 초음파 대역의 공진 주파수를 갖는 전압을 인가하여 압전층(300)을 상하부로 진동시킴으로써 초음파 신호를 생성할 수 있다. The fingerprint detector 6000 may be connected to the first and second electrodes 110 and 210 provided at upper and lower portions of the piezoelectric layer 300 of the pressure sensor 2300, respectively. The fingerprint detector 6000 may generate an ultrasonic signal by applying a voltage having a resonance frequency of the ultrasonic band to the first and second electrodes 110 and 210 to vibrate the piezoelectric layer 300 up and down.
신호 생성부(6100)는 압력 센서(2300)에 포함되는 복수의 제 1 및 제 2 전극(110, 210)과 전기적으로 연결되고, 각 전극에 소정의 주파수를 갖는 교류 전압을 인가한다. 전극에 인가되는 교류 전압에 의해 압력 센서(2300)의 압전층(300)이 상하로 진동하면서 소정의 공진 주파수, 예를 들어 10MHz를 갖는 초음파 신호가 외부로 방출된다.The signal generator 6100 is electrically connected to the plurality of first and second electrodes 110 and 210 included in the pressure sensor 2300, and applies an AC voltage having a predetermined frequency to each electrode. As the piezoelectric layer 300 of the pressure sensor 2300 vibrates up and down by an alternating voltage applied to the electrode, an ultrasonic signal having a predetermined resonance frequency, for example, 10 MHz, is emitted to the outside.
압력 센서(2300) 상의 일면, 예를 들어 보호층(500)의 일면에 특정 물체가 접촉될 수 있다. 보호층(500)의 일면에 접촉되는 물체가 지문을 포함하는 사람의 손가락인 경우, 지문에 존재하는 미세한 골(valley)과 마루(ridge)에 따라 압력 센서(2300)가 방출하는 초음파 신호의 반사 패턴이 다르게 결정된다. 보호층(500)의 일면과 같은 접촉면에 어떠한 물체도 접촉되지 않은 경우를 가정하면, 접촉면과 공기(air)의 매질 차이로 인해 압력 센서(2300)에서 생성되는 초음파 신호는 거의 대부분이 접촉면을 통과하지 못하고 반사되어 되돌아온다. 반면, 접촉면에 지문을 포함하는 특정 물체가 접촉된 경우에는, 지문의 마루(ridge)에 직접 맞닿은 압력 센서(2300)에서 생성되는 초음파 신호의 일부가 접촉면과 지문의 계면을 통과하게 되고, 생성된 초음파 신호의 일부만이 반사되어 되돌아온다. 이와 같이 반사되어 돌아오는 초음파 신호의 세기는 각 물질의 음향 임피던스에 따라 결정될 수 있다. 결국, 신호 감지부(6200)는 지문의 골(valley)과 마루(ridge)에서 초음파 신호에 의해 생성되는 음향 임피던스 차이를 압력 센서(2300)로부터 측정하여 해당 영역이 지문의 마루(ridge)에 맞닿은 센서인지 여부를 판단할 수 있다.A specific object may be in contact with one surface of the pressure sensor 2300, for example, one surface of the protective layer 500. When the object in contact with one surface of the protective layer 500 is a finger of a person including a fingerprint, reflection of the ultrasonic signal emitted by the pressure sensor 2300 according to the minute valleys and ridges present in the fingerprint. The pattern is determined differently. Assuming that no object is in contact with a contact surface such as one surface of the protective layer 500, almost all ultrasonic signals generated by the pressure sensor 2300 pass through the contact surface due to the difference between the contact surface and the air medium. I can't do it and come back. On the other hand, when a specific object including a fingerprint is in contact with the contact surface, a portion of the ultrasonic signal generated by the pressure sensor 2300 directly contacting the ridge of the fingerprint passes through the interface between the contact surface and the fingerprint. Only part of the ultrasonic signal is reflected back. As such, the intensity of the ultrasonic signal reflected back may be determined according to the acoustic impedance of each material. As a result, the signal detector 6200 measures the difference in acoustic impedance generated by the ultrasonic signal in the valley and the ridge of the fingerprint from the pressure sensor 2300 so that the corresponding area is in contact with the ridge of the fingerprint. It may be determined whether the sensor is a sensor.
연산부(6300)는 신호 감지부(6200)가 감지한 신호를 분석하여 지문 패턴을 연산한다. 반사 신호의 강도가 낮게 생성된 압력 센서(2300)는 지문의 마루(ridge)에 맞닿은 압력 센서(2300)이며, 반사 신호의 강도가 높게 생성된 - 이상적으로는 출력되는 초음파 신호의 강도와 거의 동일하게 생성된 - 압력 센서(2300)는 지문의 골(valley)에 대응하는 압력 센서(2300)이다. 따라서, 압력 센서(2300)의 각 영역에서 검출되는 음향 임피던스의 차이로부터 지문 패턴을 연산할 수 있다.The calculator 6300 calculates a fingerprint pattern by analyzing a signal detected by the signal detector 6200. The pressure sensor 2300 generated with a low intensity of the reflected signal is a pressure sensor 2300 abutting the ridge of the fingerprint, and generated with a high intensity of the reflected signal-ideally approximately equal to the intensity of the output ultrasonic signal. The pressure sensor 2300 is a pressure sensor 2300 corresponding to a valley of the fingerprint. Therefore, the fingerprint pattern may be calculated from the difference in acoustic impedance detected in each area of the pressure sensor 2300.
본 발명은 상기에서 서술된 실시 예에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 수 있다. 즉, 상기의 실시 예는 본 발명의 개시가 완전하도록 하며 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이며, 본 발명의 범위는 본원의 특허 청구 범위에 의해서 이해되어야 한다.The present invention is not limited to the above-described embodiments, but may be implemented in various forms. In other words, the above embodiments are provided to make the disclosure of the present invention complete and to fully inform those skilled in the art of the scope of the present invention, and the scope of the present invention should be understood by the claims of the present application. .

Claims (14)

  1. 윈도우;window;
    상기 윈도우를 통해 영상을 표시하는 표시부; 및A display unit which displays an image through the window; And
    상기 윈도우를 통해 인가되는 터치 입력의 위치 및 압력을 검출하는 압력 센서를 포함하고,A pressure sensor detecting a position and pressure of a touch input applied through the window;
    상기 압력 센서는 서로 이격되어 마련된 제 1 및 제 2 전극층과,The pressure sensor may include first and second electrode layers spaced apart from each other;
    상기 제 1 및 제 2 전극층 사이에 마련된 압전층을 포함하며,A piezoelectric layer provided between the first and second electrode layers,
    상기 압전층은 폴리머 내에 복수 마련된 판 형상의 압전체를 포함하는 전자기기.The piezoelectric layer includes a plate-shaped piezoelectric material provided in a plurality of polymers.
  2. 청구항 1에 있어서, 상기 압전체는 수평 방향으로 서로 교차하는 일 방향 및 타 방향으로 복수 배열되고, 수직 방향으로 복수 배열된 전자기기.The electronic device of claim 1, wherein the piezoelectric body is arranged in plural in one direction and other directions crossing each other in a horizontal direction, and plural in the vertical direction.
  3. 청구항 1에 있어서, 상기 압전체는 30% 내지 99%의 밀도로 마련된 전자기기.The electronic device of claim 1, wherein the piezoelectric body is provided at a density of 30% to 99%.
  4. 청구항 1에 있어서, 상기 압전체는 단결정을 포함하는 전자기기.The electronic device of claim 1, wherein the piezoelectric body comprises a single crystal.
  5. 청구항 1에 있어서, 상기 압전체는 페로브스카이트(perovskite) 결정 구조를 가지는 압전 물질로 형성되는 배향 원료 조성물과, 상기 배향 원료 조성물 내에 분포하며 ABO3(A는 2가의 금속 원소, B는 4가의 금속 원소)의 일반식을 가지는 산화물로 형성되는 시드 조성물을 포함하는 전자기기.The method according to claim 1, wherein the piezoelectric material is an orientation raw material composition formed of a piezoelectric material having a perovskite crystal structure, and distributed in the orientation raw material composition, ABO 3 (A is a divalent metal element, B is a tetravalent An electronic device comprising a seed composition formed of an oxide having the general formula (metal element).
  6. 윈도우;window;
    상기 윈도우를 통해 영상을 표시하는 표시부; 및A display unit which displays an image through the window; And
    상기 윈도우를 통해 인가되는 터치 입력의 위치 및 압력을 검출하는 압력 센서를 포함하고,A pressure sensor detecting a position and pressure of a touch input applied through the window;
    상기 압력 센서는 서로 이격되어 마련된 제 1 및 제 2 전극층과,The pressure sensor may include first and second electrode layers spaced apart from each other;
    상기 제 1 및 제 2 전극층 사이에 마련된 압전층을 포함하며,A piezoelectric layer provided between the first and second electrode layers,
    상기 압전층에 소정의 폭 및 깊이로 형성된 복수의 절개부를 포함하는 전자기기.Electronic device including a plurality of cutouts formed in the piezoelectric layer to a predetermined width and depth.
  7. 청구항 6에 있어서, 상기 절개부는 상기 압전층 두께의 50% 내지 100%의 깊이로 형성된 전자기기.The electronic device of claim 6, wherein the cutout is formed to a depth of 50% to 100% of the thickness of the piezoelectric layer.
  8. 청구항 6에 있어서, 상기 절개부 내에 마련된 탄성층을 더 포함하는 전자기기.The electronic device of claim 6, further comprising an elastic layer provided in the cutout.
  9. 청구항 6에 있어서, 상기 압전층은 단결정을 포함하는 전자기기.The electronic device of claim 6, wherein the piezoelectric layer comprises a single crystal.
  10. 청구항 6에 있어서, 상기 압전층은 페로브스카이트(perovskite) 결정 구조를 가지는 압전 물질로 형성되는 배향 원료 조성물과, 상기 배향 원료 조성물 내에 분포하며 ABO3(A는 2가의 금속 원소, B는 4가의 금속 원소)의 일반식을 가지는 산화물로 형성되는 시드 조성물을 포함하는 전자기기.The method according to claim 6, wherein the piezoelectric layer is an orientation raw material composition formed of a piezoelectric material having a perovskite crystal structure, and distributed in the orientation raw material composition, ABO 3 (A is a divalent metal element, B is 4 An electronic device comprising a seed composition formed of an oxide having a general formula of (valent metal element).
  11. 청구항 1 또는 청구항 6에 있어서, 상기 압력 센서는 상기 표시부 하측에 마련된 적어도 하나의 제 1 압력 센서와, 상기 윈도우 하측에 마련된 적어도 하나의 제 2 압력 센서 중 적어도 어느 하나를 포함하는 전자기기.The electronic device of claim 1 or 6, wherein the pressure sensor includes at least one of at least one first pressure sensor provided below the display unit, and at least one second pressure sensor provided below the window.
  12. 청구항 11에 있어서, 상기 윈도우와 상기 표시부 사이에 마련된 터치 센서를 더 포함하는 전자기기.The electronic device of claim 11, further comprising a touch sensor provided between the window and the display unit.
  13. 청구항 11에 있어서, 상기 제 1 전극층의 상측, 상기 제 1 및 제 2 전극층 사이, 그리고 상기 제 2 전극층의 하측 중 적어도 하나에 마련된 절연층을 더 포함하는 전자기기.The electronic device of claim 11, further comprising an insulating layer provided on at least one of an upper side of the first electrode layer, between the first and second electrode layers, and a lower side of the second electrode layer.
  14. 청구항 11에 있어서, 상기 제 1 및 제 2 전극층 상에 각각 마련되며 서로 연결되는 제 1 및 제 2 연결 패턴을 더 포함하는 전자기기.The electronic device of claim 11, further comprising first and second connection patterns respectively provided on the first and second electrode layers and connected to each other.
PCT/KR2016/012629 2015-11-06 2016-11-04 Electronic device having pressure sensor WO2017078448A1 (en)

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US15/774,260 US20180329558A1 (en) 2015-11-06 2016-11-04 Electronic device having pressure sensor

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