WO2023177109A1 - Capteur tactile et dispositif d'affichage d'image le comprenant - Google Patents

Capteur tactile et dispositif d'affichage d'image le comprenant Download PDF

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Publication number
WO2023177109A1
WO2023177109A1 PCT/KR2023/002580 KR2023002580W WO2023177109A1 WO 2023177109 A1 WO2023177109 A1 WO 2023177109A1 KR 2023002580 W KR2023002580 W KR 2023002580W WO 2023177109 A1 WO2023177109 A1 WO 2023177109A1
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WO
WIPO (PCT)
Prior art keywords
touch sensor
sensing
electrode
sensor according
layer
Prior art date
Application number
PCT/KR2023/002580
Other languages
English (en)
Korean (ko)
Inventor
권도형
이철훈
Original Assignee
동우화인켐 주식회사
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.)
Filing date
Publication date
Priority claimed from KR1020220186365A external-priority patent/KR20230135500A/ko
Application filed by 동우화인켐 주식회사 filed Critical 동우화인켐 주식회사
Publication of WO2023177109A1 publication Critical patent/WO2023177109A1/fr

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    • 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
    • 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
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor

Definitions

  • the present invention relates to a touch sensor and an image display device including the same. More specifically, it relates to a touch sensor including patterned sensing electrodes and an image display device including the same.
  • a touch panel or touch sensor which is an input device attached to the display device and allows the user to input commands by selecting the instructions displayed on the screen with a person's hand or an object, is combined with the display device to provide an image display function and Electronic devices with information input functions are being developed.
  • a touch screen panel in which a touch sensor is combined with various image display devices is being developed.
  • a sensor design capable of higher-resolution sensing is needed in a touch sensor capable of implementing fingerprint sensing. Accordingly, the spacing or pitch of the sensing electrodes may be reduced compared to a typical touch sensor.
  • One object of the present invention is to provide a touch sensor with improved resolution and electrical characteristics.
  • One object of the present invention is to provide an image display device including a touch sensor with improved resolution and electrical characteristics.
  • a first electrode layer including first sensing lines; Interlayer insulating layer; and second sensing lines facing the first electrode layer with the interlayer insulating layer interposed therebetween and intersecting the first sensing lines in a plane direction. and a second electrode layer including floating electrodes arranged between the second sensing lines in the planar direction, wherein the width of the floating electrode is greater than the line width of the second sensing line and is larger than the line width of the first sensing line.
  • a touch sensor that is small and has a line width of the first sensing line of 25 ⁇ m to 75 ⁇ m.
  • a touch sensor provided as a fingerprint sensor.
  • Window board and a touch sensor according to the above-described embodiments laminated on one surface of the window substrate.
  • Display panel and an image display device stacked on the display panel and including a touch sensor according to the above-described embodiments.
  • a touch sensor includes first and second sensing lines that intersect each other, and floating electrodes may be arranged between the second sensing lines.
  • a fringe field is induced toward the surface of the touch sensor by the floating electrodes, and the capacitance difference within the touch sensor may increase. Therefore, a high-resolution touch sensor capable of fingerprint sensing can be efficiently implemented.
  • the line width of the second sensing line may be smaller than the line width of the first sensing line, and the width of the floating electrode may be larger than the line width of the second sensing line. Accordingly, the induction of the fringe field into the second sensing line through the floating electrode can be promoted, and capacitance/charge loss through the side of the second sensing line can also be reduced.
  • FIG. 1 is a schematic cross-sectional view showing a touch sensor according to example embodiments.
  • FIGS. 2 and 3 are schematic plan views showing a first electrode layer and a second electrode layer, respectively, according to example embodiments.
  • Figure 4 is a schematic cross-sectional view showing field formation in a touch sensor of a comparative example.
  • Figure 5 is a schematic cross-sectional view showing field formation in a touch sensor according to example embodiments.
  • Figure 6 is a schematic diagram showing a window stack and an image display device according to example embodiments.
  • Embodiments of the present invention provide a touch sensor that includes first and second electrode layers of different structures/shapes and provides high-resolution fingerprint sensing. Additionally, an image display device including the touch sensor is provided.
  • 1 is a schematic cross-sectional view showing a touch sensor according to example embodiments.
  • 2 and 3 are schematic plan views showing a first electrode layer and a second electrode layer, respectively, according to example embodiments.
  • touch sensor used in this application is used to encompass a sensor that inputs a command or generates a signal according to the touch of the user's finger or tool, and a sensor that generates a signal by recognizing the shape of the fingerprint of the finger. .
  • the touch sensor 100 may include a first electrode layer 110 and a second electrode layer 120 facing each other with an interlayer insulating layer 105 therebetween.
  • the interlayer insulating layer 105 may be provided as a dielectric layer that generates mutual capacitance (Cm) between the first electrode layer 110 and the second electrode layer 120.
  • the interlayer insulating layer 105 may include an organic polymer material in consideration of dielectric constant and flexibility for application to an image display device.
  • the interlayer insulating layer 105 is made of cyclic olefin polymer (COP), polyethylene terephthalate (PET), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), and polyphenylene sulfide. (PPS), polyallylate, polyimide (PI), cellulose acetate propionate (CAP), polyethersulfone (PES), cellulose triacetate (TAC), polycarbonate (PC), cyclic olefin copolymer (COC), polymethyl methacrylate (PMMA), etc. These may be used alone or in combination of two or more.
  • COP cyclic olefin polymer
  • PET polyethylene terephthalate
  • PAR polyacrylate
  • PEI polyetherimide
  • PEN polyethylene naphthalate
  • PPS polyphenylene sulfide
  • PPS polyallylate
  • PI polyimide
  • CAP cellulose acetate propionate
  • the interlayer insulating layer 105 may be formed of a polyimide (PI) layer.
  • PI polyimide
  • the first electrode layer 110 may include a plurality of first sensing lines 115. As shown in FIG. 2, the first sensing line 115 may extend in a first direction parallel to the upper surface of the interlayer insulating layer 105. A plurality of first sensing lines 115 may be arranged along a second direction that intersects the first direction and is parallel to the top surface of the interlayer insulating layer 105. The first direction and the second direction may be perpendicular to each other.
  • the line width (eg, width in the second direction) W1 of the first sensing line 115 may range from 25 ⁇ m to 75 ⁇ m.
  • the line width W1 of the first sensing line 115 may be in the range of 30 ⁇ m to 50 ⁇ m.
  • the second electrode layer 120 may include a plurality of second sensing lines 125 and floating electrodes 127.
  • the second sensing line 125 may extend in the second direction.
  • a plurality of second sensing lines 125 may be arranged along the second direction. Accordingly, the first sensing lines 115 and the second sensing lines 125 intersect each other with the interlayer insulating layer 105 in between, and coordinate information of the input position can be generated.
  • the floating electrodes 127 are arranged on the upper surface of the interlayer insulating layer 105 and may be located on the same layer or at the same level as the second sensing lines 125. According to example embodiments, the floating electrodes 127 may be arranged between the second sensing lines 125 in a planar direction.
  • a plurality of floating electrodes 127 may be arranged in the second direction to form a floating electrode row.
  • a plurality of floating electrode rows may be disposed between neighboring second sensing lines 125 .
  • the floating electrodes 127 are physically spaced apart from the second sensing lines 125 and may have an island pattern shape between neighboring second sensing lines 125.
  • the floating electrode 127 may have a rectangular shape, for example, may be formed in a square pattern.
  • the shape of the floating electrode 127 may be appropriately changed to a polygon such as a pentagon or hexagon, a circle, or an oval.
  • the line width W2 (e.g., width in the first direction) of the second sensing line 125 may be smaller than the line width W1 of the first sensing line 115.
  • the line width W2 of the second sensing line 125 may be in the range of 5 ⁇ m to 20 ⁇ m.
  • the line width W2 of the second sensing line 125 may be in the range of 5 ⁇ m to 15 ⁇ m.
  • the width W3 (eg, width in the first direction) of the floating electrode 127 may be larger than the line width W2 of the second sensing line 125 .
  • the width W3 of the floating electrode 127 may be greater than the line width W2 of the second sensing line 125 and smaller than the line width W1 of the first sensing line 115.
  • both the horizontal and vertical lengths of the floating electrode 127 are larger than the line width W2 of the second sensing line 125, and the first It may be smaller than the line width W1 of the sensing line 115.
  • the width W3 of the floating electrode 127 may be in the range of 5 ⁇ m to 50 ⁇ m.
  • the width W3 of the floating electrode 127 may range from 10 ⁇ m to 50 ⁇ m, 15 ⁇ m to 30 ⁇ m, or 15 ⁇ m to 25 ⁇ m.
  • a plurality of floating electrodes 127 may be arranged along the second direction between neighboring second sensing lines 125 to form a floating electrode row.
  • one floating electrode row may be disposed in each space between neighboring second sensing lines 125. Accordingly, uniform capacitance characteristics can be implemented over the entire area of the touch sensor.
  • the first electrode layer 110 and the second electrode layer 120 may include a low-resistance metal or alloy in consideration of high-resolution fingerprint sensing.
  • the first electrode layer 110 and the second electrode layer 120 are silver (Ag), gold (Au), copper (Cu), aluminum (Al), platinum (Pt), palladium (Pd), chromium ( Cr), titanium (Ti), tungsten (W), niobium (Nb), tantalum (Ta), vanadium (V), iron (Fe), manganese (Mn), cobalt (Co), nickel (Ni), zinc ( Zn), molybdenum (Mo), tin (Sn), calcium (Ca) or an alloy containing at least one of these (e.g., silver-palladium-copper (APC) or copper-calcium (CuCa)) You can. These may be used alone or in combination of two or more.
  • APC silver-palladium-copper
  • CuCa copper-calcium
  • the touch sensor 100 may further include a base layer 90.
  • the first electrode layer 110, the interlayer insulating layer 105, and the second electrode layer 120 may be sequentially disposed on the base layer 90.
  • the base layer 90 may include a material that is substantially the same as or similar to the polymer material mentioned in the interlayer insulating layer 105.
  • the base layer 90 may include an inorganic insulating material such as glass, silicon oxide, or silicon nitride.
  • a passivation layer 130 covering the second electrode layer 120 may be formed on the interlayer insulating layer 105.
  • the passivation layer 130 may be provided as a protective layer of the touch sensor 100 or a surface layer to which a touch input is applied.
  • the passivation layer 130 may include an organic polymer material such as an acrylic polymer, a polyimide polymer, a siloxane polymer, an epoxy polymer, or an inorganic insulating material such as silicon oxide, silicon nitride, silicon oxynitride, or metal oxide. there is.
  • Figure 4 is a schematic cross-sectional view showing field formation in a touch sensor of a comparative example.
  • the first sensing line 115 and the second sensing line 125 may have substantially the same or similar size/arrangement structure except for the extension direction.
  • a direct mutual capacitance is created in the first sensing line 115 and the second sensing line 125, and as indicated by the thick curved arrows, some electric field is directed toward the surface of the touch sensor.
  • a fringe field can be formed.
  • the fringe field induced toward the surface can be quickly discharged when a finger touch is input adjacent to the second electrode layer 120. Accordingly, the fringe field can improve the response speed and sensitivity of the touch sensor.
  • Cm may be generated on the side of the second sensing line 125, resulting in loss of charge.
  • Figure 5 is a schematic cross-sectional view showing field formation in a touch sensor according to example embodiments.
  • floating electrodes 127 may be arranged around the second sensing line 125 .
  • Direct Cm may also be generated between the floating electrode 127 and the first sensing line 115, as indicated by a dotted arrow.
  • the floating electrode 127 interacts with the second sensing line 125 at the same level and interacts with the second sensing line 125, as indicated by the thick dotted arrow, through a difference in charge amount, to the fringe field adjacent to the touch sensor surface. can be guided towards.
  • the total amount of fringe fields directed to the finger touch surface of the touch sensor as a whole may be increased.
  • the fringe field may increase the amount of discharge at points corresponding to valleys and ridges of the fingerprint, thereby increasing the difference in capacitance between the valleys and ridges.
  • the capacitance difference can be expressed as Equation 1 below.
  • a touch sensor capable of recognizing the shape of a fingerprint at high resolution can be more effectively implemented. Additionally, as the capacitance difference increases, the ability to distinguish between signals and noise also increases, allowing a high-resolution/high-reliability fingerprint recognition sensor to be implemented.
  • ⁇ Cm of the touch sensor 100 may be 0.48fF or more. In a preferred embodiment, ⁇ Cm of the touch sensor 100 may be 0.5fF or more, and fingerprint sensing with higher resolution and higher reliability can be implemented.
  • the line width of the second sensing line 125 can be relatively narrowed, and the width of the floating electrode 127 can be increased. Accordingly, the generation of a field on the side of the second sensing line 125 that causes loss of charge can be suppressed, while the generation of a fringe field can be promoted.
  • Figure 6 is a schematic diagram showing a window stack and an image display device according to example embodiments.
  • the window stack 250 may include a window substrate 230, a polarizing layer 210, and a touch sensor 200 according to the above-described exemplary embodiments.
  • the window substrate 230 includes, for example, thin glass (eg, UTG) or a hard coating film, and in one embodiment, a light blocking pattern 235 is formed on the periphery of one side of the window substrate 230. can be formed.
  • the light blocking pattern 235 may include, for example, a color printing pattern and may have a single-layer or multi-layer structure.
  • the bezel portion or non-display area of the image display device may be defined by the light blocking pattern 235.
  • the polarizing layer 210 may include a coated polarizer or a polarizing plate.
  • the coated polarizer may include a liquid crystal coating layer containing a polymerizable liquid crystal compound and a dichroic dye.
  • the polarizing layer 210 may further include an alignment film to provide alignment to the liquid crystal coating layer.
  • the polarizing plate may include a polyvinyl alcohol-based polarizer and a protective film attached to at least one side of the polyvinyl alcohol-based polarizer.
  • the polarizing layer 210 may be directly bonded to the one surface of the window substrate 230 or may be attached through the first point adhesive layer 220.
  • the touch sensor 200 may be included in the window laminate 250 in the form of a film or panel. In one embodiment, the touch sensor 200 may be coupled to the polarization layer 210 through the second point adhesive layer 225.
  • the window substrate 230, the polarization layer 210, and the touch sensor 200 may be arranged in that order from the user's viewing side.
  • the electrode layer of the touch sensor 200 is disposed below the polarization layer 210, the electrode visibility phenomenon can be more effectively prevented.
  • the touch sensor 200 may be directly transferred onto the window substrate 230 or the polarizing layer 210.
  • the window substrate 230, the touch sensor 200, and the polarizing layer 210 may be arranged in that order from the user's viewing side.
  • the touch sensor 200 may include a high-resolution fingerprint sensor according to the exemplary embodiments described above.
  • the touch sensor 200 may also include a low-resolution touch sensor that recognizes coordinate information depending on the presence or absence of a general touch input.
  • the low-resolution touch sensor includes sensing unit electrodes, and the width of the sensing unit electrode may be 1 mm or more, 2 mm or more, 3 mm or more, or 4 mm or more.
  • the high-resolution fingerprint sensor and the low-resolution touch sensor may be placed together at the same level, or may be placed separately on different floors.
  • the image display device may include a display panel 360 and the window stack 250 described above coupled to the display panel 360.
  • the display panel 360 may include a pixel electrode 310, a pixel defining film 320, a display layer 330, an opposing electrode 340, and an encapsulation layer 350 disposed on the panel substrate 300. You can.
  • a pixel circuit including a thin film transistor (TFT) is formed on the panel substrate 300, and an insulating film covering the pixel circuit may be formed.
  • the pixel electrode 310 may be electrically connected to, for example, a drain electrode of a TFT on the insulating film.
  • the pixel defining layer 320 may be formed on the insulating layer to expose the pixel electrode 310 to define the pixel area.
  • a display layer 330 is formed on the pixel electrode 310, and the display layer 330 may include, for example, a liquid crystal layer or an organic light-emitting layer.
  • An opposing electrode 340 may be disposed on the pixel defining layer 320 and the display layer 330.
  • the counter electrode 340 may be provided as a common electrode or cathode of an image display device, for example.
  • An encapsulation layer 350 for protecting the display panel 360 may be stacked on the counter electrode 340 .
  • the display panel 360 and the window laminate 250 may be coupled through a point adhesive layer 260.
  • the thickness of the point adhesive layer 260 may be greater than the thickness of each of the first and second point adhesive layers 220 and 225, and the viscoelasticity at -20 to 80 o C may be about 0.2 MPa or less.
  • the viscoelasticity may be about 0.01 to 0.15 MPa.
  • a touch sensor having the structure shown in Figure 1 was manufactured. Specifically, a first electrode layer having the structure shown in FIG. 2 and a second electrode layer having the structure shown in FIG. 3 were formed on the top and bottom surfaces of the interlayer insulating layer made of polyimide (PI) film, respectively.
  • PI polyimide
  • the first electrode layer and the second electrode layer were formed of copper lines having the line widths listed in Table 1.
  • the floating electrodes were formed in rectangular patterns with the width*height sizes listed in Table 1.
  • a touch sensor having the same structure as Example 1 was manufactured, except that the first electrode layer and the second electrode layer each included sensing lines with a line width of 40 ⁇ m, and the floating electrodes were omitted.
  • the first electrode layer and the second electrode layer were formed of copper lines having the line widths listed in Table 1.
  • the floating electrodes were formed in rectangular patterns with the width*height sizes listed in Table 1.
  • Example 1 40 10 20*20
  • Example 2 40 10 15*15 Comparative Example 1
  • 40 - Comparative Example 2 40 10 20*10 Comparative Example 3
  • 10 10*10 Comparative Example 4 40 10 5*5 Comparative Example 5 80 25 55*55 Comparative Example 6 20 3 4*4
  • ⁇ Cm in the touch sensor of the example increased by more than 10 times compared to the touch sensor of Comparative Example 1 in which the floating electrode was omitted. Accordingly, it can be predicted that the fingerprint sensor recognition resolution can be significantly increased through the above-described embodiments.

Abstract

Des modes de réalisation de la présente invention concernent un capteur tactile et un dispositif d'affichage d'image le comprenant. Le capteur tactile comprend : une première couche d'électrode comprenant des premières lignes de détection ; une couche isolante intercouche ; et une seconde couche d'électrode opposée à la première couche d'électrode, la couche isolante intercouche étant interposée entre celles-ci. La seconde couche d'électrode comprend : des secondes lignes de détection croisant les premières lignes de détection dans un sens plan ; et des électrodes flottantes disposées entre les secondes lignes de détection respectives dans le sens plan.
PCT/KR2023/002580 2022-03-16 2023-02-23 Capteur tactile et dispositif d'affichage d'image le comprenant WO2023177109A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20220032697 2022-03-16
KR10-2022-0032697 2022-03-16
KR10-2022-0186365 2022-12-27
KR1020220186365A KR20230135500A (ko) 2022-03-16 2022-12-27 터치 센서 및 이를 포함하는 화상 표시 장치

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WO2023177109A1 true WO2023177109A1 (fr) 2023-09-21

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014130626A (ja) * 2014-02-24 2014-07-10 Japan Display Inc 情報入力装置、表示装置
JP2014203203A (ja) * 2013-04-03 2014-10-27 三菱電機株式会社 タッチスクリーン、及び、それを備えるタッチパネル
KR20180125676A (ko) * 2017-05-15 2018-11-26 삼성디스플레이 주식회사 입력감지회로 및 이를 포함하는 표시모듈
KR20180137830A (ko) * 2017-06-19 2018-12-28 삼성전자주식회사 지압 인식 장치 및 이를 포함하는 전자 기기
KR20190125554A (ko) * 2018-04-27 2019-11-07 삼성디스플레이 주식회사 입력 감지 장치 및 이를 포함하는 표시 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014203203A (ja) * 2013-04-03 2014-10-27 三菱電機株式会社 タッチスクリーン、及び、それを備えるタッチパネル
JP2014130626A (ja) * 2014-02-24 2014-07-10 Japan Display Inc 情報入力装置、表示装置
KR20180125676A (ko) * 2017-05-15 2018-11-26 삼성디스플레이 주식회사 입력감지회로 및 이를 포함하는 표시모듈
KR20180137830A (ko) * 2017-06-19 2018-12-28 삼성전자주식회사 지압 인식 장치 및 이를 포함하는 전자 기기
KR20190125554A (ko) * 2018-04-27 2019-11-07 삼성디스플레이 주식회사 입력 감지 장치 및 이를 포함하는 표시 장치

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