WO2012070719A1 - Touch sensing device having two-layered structure - Google Patents

Touch sensing device having two-layered structure Download PDF

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Publication number
WO2012070719A1
WO2012070719A1 PCT/KR2011/000442 KR2011000442W WO2012070719A1 WO 2012070719 A1 WO2012070719 A1 WO 2012070719A1 KR 2011000442 W KR2011000442 W KR 2011000442W WO 2012070719 A1 WO2012070719 A1 WO 2012070719A1
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Prior art keywords
core
path
main
light
branch
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PCT/KR2011/000442
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French (fr)
Korean (ko)
Inventor
조기호
이민수
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주식회사 엘엠에스
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Publication of WO2012070719A1 publication Critical patent/WO2012070719A1/en

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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
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04109—FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location

Definitions

  • the present invention relates to an optical waveguide, and more particularly, to an optical waveguide device composed of two layers.
  • a general optical waveguide is an optical transmission path that traps light waves and propagates low loss in the longitudinal direction.
  • the optical waveguide comprises a core having a large refractive index and a cladding having a low refractive index surrounding the core, and reflecting the internal reflection due to a difference in refractive index between the core and the cladding. It has a principle of transmitting the optical signal by using the basic principle.
  • the optical waveguide is disposed on the substrate in a grid-like grid to form a core, and a cladding is disposed to surround both sides of the core in the transverse direction, and each branch point of two adjacent optical paths among the outermost optical paths of the grid.
  • the optical waveguide for the touch screen may be manufactured by using a splitter formed of a material having a difference between the core and the refractive index.
  • An object of the present invention is to provide a touch panel in which there is no optical loss at an intersection of optical paths using a two-layer optical waveguide, and a sensing efficiency decrease and a detection error do not occur due to the optical loss.
  • Touch sensing device is formed on a rectangular substrate, the substrate, the main light path and the plurality of branch light paths extending in a direction perpendicular to the extension direction of the main light path adjacent to one side of the substrate;
  • a first core made of a material having a refractive index smaller than that of the first core, and formed on the substrate, the first cladding disposed to surround both sides of the optical path in the optical path transverse direction of the first core and the branch optical path on the main optical path of the first core.
  • a plurality of light emitting diodes disposed at a branching position of the plurality of cores and having a refractive index difference from the first core and formed to have a direction angle with respect to the incident light so as to reflect a part of the incident light from the main optical path of the first core in the direction of the branching path of the first core;
  • a second core composed of a plurality of branched optical paths branched in a direction perpendicular to the extending direction of the second core, the material having a refractive index smaller than that of the second core, formed on the substrate, and a second core disposed to surround both sides of the second optical path in the optical path direction; It is disposed at a branching position of the branching path on the cladding and the main optical path of the second core, has a refractive index difference from
  • a light source is disposed at one end of the main light path of the first core and the main light path of the second core, and the sides of the first and second cores adjacent to the main light path are formed adjacent to each other. Arranged along the sides, it may include a plurality of optical sensors arranged to receive light from the exit end of the branch path of the first and second core.
  • the first layer and the second layer are bonded by an adhesive layer
  • the refractive index of the adhesive layer may be smaller than the refractive index of each of the first core and the second core.
  • the adhesive layer may be characterized in that the same material as the first cladding.
  • the splitter may be formed of a material having the same refractive index as the first cladding or the second cladding.
  • the splitter may be formed of air.
  • the substrate may be a resin film or glass.
  • the touch panel of the present invention there is no optical loss at the intersection point of the optical path by using the optical waveguide composed of two layers, and it is possible to accurately sense the touch position in the touch area because the sensing efficiency decrease and the detection error do not occur due to the optical loss. Do.
  • FIG. 1 is a schematic diagram of a touch sensing device according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view of a touch sensing device according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram illustrating an operating state of a touch sensing device according to an embodiment of the present invention.
  • the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.
  • FIG. 1 is a schematic diagram of a touch sensing device according to an embodiment of the present invention
  • Figure 2 is a cross-sectional view of the touch sensing device according to an embodiment of the present invention
  • Figure 3 is a touch sensing device according to an embodiment of the present invention It is a schematic diagram explaining the operation state of.
  • a touch sensing device is composed of a substrate 120, a first waveguide layer 140, and a second waveguide layer 140.
  • the first waveguide layer 140 formed on the substrate has a first cladding disposed to surround both sides of the first core 100 composed of the main optical path 101 and the branch optical path 102 and the optical path transverse sides of the first core. It consists of 130. It further includes a splitter 103 arranged on the main optical path of the first core at the branch position of the branch optical path.
  • the substrate 120 may be formed of a transparent film or tempered glass in order to operate as a touch sensing device, but is not limited thereto.
  • An opaque substrate may be applied.
  • the second waveguide layer 160 has the same structure as the first waveguide layer 140 and is formed on the first waveguide layer 140. However, the main optical path 201 of the second waveguide layer 160 is disposed such that the main optical path 101 of the first waveguide layer 140 and the extending direction are perpendicular to each other.
  • the first core 100 is formed on the substrate 120.
  • the first core 100 is composed of a main path 101 and a branch path 102, and a splitter existing in the main path 101.
  • the incident light incident from the light source L1 disposed at one end of the main light path 103 is totally reflected through the main light path 101, the incident light splits the advancing incident light toward the branch light path 102.
  • the splitter 103 In order to split the incident light propagating through the main optical path 101 onto the main optical path 101 in the direction of the branch optical path 102, the splitter 103 must have a difference in refractive index from that of the first core 100. . In addition, since there are a plurality of branch light paths 102 in the vertical direction of the main light path 101 in the extending direction, the splitter 103 branches to split the incident light from the main light path 101 into the respective branch light paths 102. There are as many as optical paths 102.
  • the first cladding 130 disposed to surround both sides of the optical path transverse direction of the first core 100 has a difference in refractive index with a material forming the first core 100, and as a result, total internal reflection occurs to transmit an optical signal. .
  • the first cladding 130 has a smaller refractive index than the material of the first core 100, but is not necessarily limited thereto.
  • the second waveguide layer 160 has the same structure as the first waveguide layer 140 and is formed on the first waveguide layer 140.
  • light sources L1 and L2 are disposed at one end of the main light path 101 of the first core and the main light path 201 of the second core, and the opposite sides of the sides where the main light paths of the first and second cores are adjacent to each other.
  • a plurality of optical sensors 110 and 210 are arranged to be able to receive light from the exit ends of the branch paths of the first and second cores.
  • FIG. 2 illustrates a cross-sectional view of the touch sensing device cut along the branching optical path 202 of the second waveguide layer 160.
  • the first waveguide layer 140 and the second waveguide layer 160 are bonded by the adhesive layer 150, the second waveguide layer 160 is formed on the first waveguide layer 140, and the adhesive layer 150 Is bonded. 2 shows the adhesive layer 150, although the same material as the first cladding 130 material may be used.
  • the second waveguide layer 160 is coupled to the upper portion of the first waveguide layer 140, but the branched light paths form a lattice structure to form a touch area.
  • the refractive index of the adhesive layer 150 is preferably smaller than the respective refractive indices of the first and second cores.
  • the branch optical path 202 of the second core 200 is advanced.
  • the total reflection of the light is damaged.
  • a change in the amount of light is detected in the optical sensor 210 of the optical path in which total reflection is damaged.
  • the optical path of is transformed. Due to the deformation of the branch optical path 102 of the first core, total reflection of the light traveling through the branch optical path 102 of the first core 100 is damaged, and the light quantity change is detected by the optical sensor 110 of the corresponding optical path. do.
  • the optical sensors 110 and 210 aligned to the respective branch optical paths 102 and 202 of the first and second cores sense a change in the amount of light of the branch optical paths of the first and second cores passing through the deformation position. It is possible to detect the two-dimensional position where the finger or the like is in contact.
  • first core 101 main path of the first core
  • first cladding 140 first waveguide layer
  • adhesive layer 160 second waveguide layer
  • L1, L2 light source

Abstract

A touch sensing device according to an embodiment of the present invention includes a board, a first waveguide layer, and a second waveguide layer. The board has a tetragonal shape. The first waveguide layer includes a first core, a first cladding, and a plurality of splitters. The first core is disposed over the board, and includes a main light path and a plurality of branch light paths. The main light path is adjacent to a side portion of the board and extends in parallel to the side portion thereof, and the branch light paths are branched in a direction perpendicular to the direction in which the main light path extends. The first cladding has a refractive index smaller than that of the first core and is disposed over the board to cover both lateral side portions of a light path of the first core. The splitters are disposed on the main light path at branch points of the branch light paths, and have a refractive index different from that of the first core. In addition, the splitters have an orientation angle from incident light in order to reflect a portion of the incident light from the main light path toward the branch light paths. The second waveguide layer includes a second core, a second cladding, and a plurality of splitters. The second core is disposed over the first waveguide layer, and includes a main light path and a plurality of branch light paths. The main light path of the second core is adjacent to another side portion of the board, which is perpendicular to the first side portion of the board, and extends in parallel to the second side portion thereof, and the branch light paths of the second core are branched in a direction perpendicular to the direction in which the main light path of the second core extends. The second cladding has a refractive index smaller than that of the second core, and is disposed over the board to cover both lateral side portions of a light path of the second core. The splitters of the second core are disposed on the main light path of the second core at branch points of the branch light paths of the second core, and have a refractive index different from that of the second core. In addition, the splitters of the second core have an orientation angle from incident light in order to reflect a portion of the incident light from the main light path of the second core toward the branch light paths of the second core. An object of the present invention is to provide a touch panel comprising an optical waveguide that includes a first waveguide layer and a second wave guide, to prevent an optical loss at a cross point of light paths. Accordingly, the degradation of sensing efficiency and detecting errors due to an optical loss can be prevented so as to accurately sense a touched point in a touch region.

Description

2 층 구조의 터치 센싱 장치2-layer touch sensing device
본 발명은 광도파로에 관한 것으로, 더 상세하게는 2층으로 구성된 광도파로 장치에 관한 것이다.The present invention relates to an optical waveguide, and more particularly, to an optical waveguide device composed of two layers.
최근에 광신호의 분기, 변조, 스윗칭, 신호 다중화 등의 광신호 처리를 목적으로 평면 도파로 기술을 이용하여 평면 기판상에 광 도파로를 제작하는 기술에 대하여 많은 연구가 이루어 지고 있다. 이러한 광 도파로 소자를 제작하기 위하여 필요한 기술로서는 도파로의 설계, 제작 및 패키지등을 예로 들 수 있다.Recently, a lot of researches have been made on a technique for fabricating an optical waveguide on a planar substrate using a planar waveguide technology for the purpose of optical signal processing such as optical signal branching, modulation, switching, and signal multiplexing. As a technique required for fabricating such an optical waveguide device, examples thereof include design, fabrication, and packaging of a waveguide.
일반적인 광 도파로는 광파를 가두고 길이방향으로 손실이 적게 전파시키는 광 전송로로서, 굴절율이 큰 코어와, 코어를 둘러싸고 있는 굴절율이 낮은 클래딩으로 구성되어, 상기 코어와 클래딩의 굴절율 차에 의한 내부 반사를 기본 원리로하여 광 신호를 전달하게 되는 원리를 갖는다.A general optical waveguide is an optical transmission path that traps light waves and propagates low loss in the longitudinal direction. The optical waveguide comprises a core having a large refractive index and a cladding having a low refractive index surrounding the core, and reflecting the internal reflection due to a difference in refractive index between the core and the cladding. It has a principle of transmitting the optical signal by using the basic principle.
상기와 같은 광도파로를 기판위에 격자상 그리드 형태로 배치하여 코어를 형성하고, 상기 코어의 횡방향 양측을 감싸도록 클래딩을 배치하고, 상기 그리드의 최외곽 광로 중 인접하는 2 개의 광로의 각 분기지점에 배치되며, 상기 코어와 굴절율의 차이를 갖는 물질로 구성된 스플리터를 이용하여 터치 스크린용 광 도파도의 제작이 가능하다.The optical waveguide is disposed on the substrate in a grid-like grid to form a core, and a cladding is disposed to surround both sides of the core in the transverse direction, and each branch point of two adjacent optical paths among the outermost optical paths of the grid. The optical waveguide for the touch screen may be manufactured by using a splitter formed of a material having a difference between the core and the refractive index.
상기와 같이 단층의 격자상 그리드 형태로 배치하면 광로 내부에서 전반사가 일어남에도 불구하고 광로교차 지점에서 광손실이 발생하는 문제점이 있어 센싱효율의 저하 및 터치 위치 검출 에러가 유발될 수 있다.As described above, in the case of a single-layer lattice-shaped grid, there is a problem that optical loss occurs at the intersection of optical paths even though total reflection occurs inside the optical path, which may cause a decrease in sensing efficiency and a touch position detection error.
본 발명은 2 층으로 이루어진 광도파로를 이용하여 광로 교차 지점에서 광손실이 없으며, 광손실로 인한 센싱효율저하 및 검출 에러가 발생하지 않는 터치 패널을 제공하고자 한다.An object of the present invention is to provide a touch panel in which there is no optical loss at an intersection of optical paths using a two-layer optical waveguide, and a sensing efficiency decrease and a detection error do not occur due to the optical loss.
본 발명의 일실시예에 따른 터치 센싱 장치는 사각형상의 기판, 상기 기판위에 형성되며, 기판의 일측변과 인접하여 나란히 연장되는 주광로와 주광로의 연장방향과 수직방향으로 분기된 복수개의 분기광로로 이루어진 제 1 코어, 제 1 코어보다 작은 굴절률을 갖는 물질로서 상기 기판 위에 형성되며, 제 1 코어의 광로 횡방향 양측을 감싸도록 배치되는 제 1 클래딩 및 상기 제 1 코어의 주광로상에 분기광로의 분기위치에 배치되며, 상기 제 1 코어와 굴절율 차이를 갖고, 제 1 코어의 주광로로부터 제 1 코어의 분기광로 방향으로 입사광의 일부를 반사하도록 입사광에 대하여 지향각을 갖도록 형성되는 복수의 스플리터를 포함하는 제 1 도파층 및 제 1 도파층 위에 형성되며, 상기 일측변과 수직한 다른 한변에 인접하여 나란히 연장되는 주광로와 주광로의 연장방향과 수직방향으로 분기된 복수개의 분기광로로 이루어진 제 2 코어, 제 2 코어보다 작은 굴절률을 갖는 물질로서 상기 기판위에 형성되며, 제 2 코어의 광로 횡방향 양측을 감싸도록 배치되는 제 2 클래딩 및 상기 제 2 코어의 주광로상에 분기광로의 분기위치에 배치되며, 상기 제 2 코어와 굴절율 차이를 갖고, 제 2 코어의 주광로로부터 제 2 코어의 분기광로 방향으로 입사광의 일부를 반사하도록 입사광에 대하여 지향각을 갖도록 형성되는 복수의 스플리터를 포함하는 제 2 도파층을 포함한다.Touch sensing device according to an embodiment of the present invention is formed on a rectangular substrate, the substrate, the main light path and the plurality of branch light paths extending in a direction perpendicular to the extension direction of the main light path adjacent to one side of the substrate; A first core made of a material having a refractive index smaller than that of the first core, and formed on the substrate, the first cladding disposed to surround both sides of the optical path in the optical path transverse direction of the first core and the branch optical path on the main optical path of the first core. A plurality of light emitting diodes disposed at a branching position of the plurality of cores and having a refractive index difference from the first core and formed to have a direction angle with respect to the incident light so as to reflect a part of the incident light from the main optical path of the first core in the direction of the branching path of the first core; A main light path and a main light path formed on the first waveguide layer including the splitter and the first waveguide layer, and extending side by side adjacent to another side perpendicular to the one side; A second core composed of a plurality of branched optical paths branched in a direction perpendicular to the extending direction of the second core, the material having a refractive index smaller than that of the second core, formed on the substrate, and a second core disposed to surround both sides of the second optical path in the optical path direction; It is disposed at a branching position of the branching path on the cladding and the main optical path of the second core, has a refractive index difference from the second core, and a part of the incident light in the direction of the branching path of the second core from the main optical path of the second core. And a second waveguide layer comprising a plurality of splitters formed to have a directing angle with respect to incident light so as to reflect.
본 발명의 일실시예에 따른 터치 센싱 장치에 있어서, 제 1 코어의 주광로 및 제 2 코어의 주광로 일측단에 광원이 배치되고, 상기 제 1 및 제 2 코어의 주광로가 인접 형성된 변의 대향변들을 따라 배치되며, 제 1 및 제 2 코어의 분기광로의 출사단으로부터 수광 가능하도록 배치된 복수의 광센서를 포함할 수 있다.In the touch sensing device according to an embodiment of the present invention, a light source is disposed at one end of the main light path of the first core and the main light path of the second core, and the sides of the first and second cores adjacent to the main light path are formed adjacent to each other. Arranged along the sides, it may include a plurality of optical sensors arranged to receive light from the exit end of the branch path of the first and second core.
본 발명의 일실시예에 따른 터치 센싱 장치에 있어서, 상기 제 1층과 제 2층은 접착층에 의하여 접착되며, 접착층의 굴절율은 제 1 코어 및 제 2 코어의 각 굴절율보다 작을 수 있다.In the touch sensing device according to an embodiment of the present invention, the first layer and the second layer are bonded by an adhesive layer, the refractive index of the adhesive layer may be smaller than the refractive index of each of the first core and the second core.
본 발명의 일실시예에 따른 터치 센싱 장치에 있어서, 상기 접착층은 제 1 클래딩과 동일한 재료인 것을 특징으로 할 수 있다.In the touch sensing device according to an embodiment of the present invention, the adhesive layer may be characterized in that the same material as the first cladding.
본 발명의 일실시예에 따른 터치 센싱 장치에 있어서, 상기 스플리터는 제 1 클래딩 또는 제 2 클래딩과 동일한 굴절률을 갖는 물질로 형성된 것을 특징으로 할 수 있다.In the touch sensing device according to an embodiment of the present invention, the splitter may be formed of a material having the same refractive index as the first cladding or the second cladding.
본 발명의 일실시예에 따른 터치 센싱 장치에 있어서, 상기 스플리터는 공기로 형성된 것을 특징으로 할 수 있다.In the touch sensing device according to an embodiment of the present invention, the splitter may be formed of air.
본 발명의 일실시예에 따른 터치 센싱 장치에 있어서, 상기 기판은 수지필름 또는 유리가 사용될 수 있다.In the touch sensing device according to an embodiment of the present invention, the substrate may be a resin film or glass.
본 발명의 터치패널은 2 층으로 이루어진 광도파로를 이용하여 광로 교차 지점에서 광손실이 없으며, 광손실로 인한 센싱효율저하 및 디텍팅 에러가 발생하지 않아 터치 영역에서의 터치 위치의 정확한 센싱이 가능하다.In the touch panel of the present invention, there is no optical loss at the intersection point of the optical path by using the optical waveguide composed of two layers, and it is possible to accurately sense the touch position in the touch area because the sensing efficiency decrease and the detection error do not occur due to the optical loss. Do.
1 은 본 발명의 일실시예에 따른 터치 센싱 장치의 모식도이다.1 is a schematic diagram of a touch sensing device according to an embodiment of the present invention.
도 2 는 본 발명의 일실시예에 따른 터치 센싱 장치의 단면도이다.2 is a cross-sectional view of a touch sensing device according to an embodiment of the present invention.
도 3 은 본 발명의 일실시예에 따른 터치 센싱 장치의 동작상태를 설명하는모식도이다.3 is a schematic diagram illustrating an operating state of a touch sensing device according to an embodiment of the present invention.
본 발명은 다양한 변경을 가할 수 있고 여러 가지 실시 예를 가질 수 있는 바, 특정 실시 예들을 도면에 예시하고 상세한 설명에 상세하게 설명하고자 한다. 그러나, 이는 본 발명을 특정한 실시 형태에 대해 한정하려는 것이 아니며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변경, 균등물 내지 대체물을 포함하는 것으로 이해되어야 한다.As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.
제1, 제2 등과 같이 서수를 포함하는 용어는 다양한 구성요소들을 설명하는데 사용될 수 있지만, 상기 구성요소들은 상기 용어들에 의해 한정되지는 않는다.Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms.
상기 용어들은 하나의 구성요소를 다른 구성요소로부터 구별하는 목적으로만 사용된다.The terms are used only for the purpose of distinguishing one component from another.
예를 들어, 본 발명의 권리 범위를 벗어나지 않으면서 제2 구성요소는 제1 구성요소로 명명될 수 있고, 유사하게 제1 구성요소도 제2 구성요소로 명명될 수 있다.For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.
본 출원에서 사용한 용어는 단지 특정한 실시 예를 설명하기 위해 사용된 것The terminology used herein is for the purpose of describing particular embodiments only.
으로, 본 발명을 한정하려는 의도가 아니다. 단수의 표현은 문맥상 명백하게 다르게 뜻하지 않는 한, 복수의 표현을 포함한다. 본 출원에서, "포함한다" 또는 "가지다" 등의 용어는 명세서상에 기재된 특징, 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것이 존재함을 지정하려는 것이지, 하나 또는 그 이상의 다른 특징들이나 숫자, 단계, 동작, 구성요소, 부품 또는 이들을 조합한 것들의 존재 또는 부가 가능성을 미리 배제하지 않는 것으로 이해되어야 한다.It is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprises" or "having" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.
이제 본 발명의 일실시예에 따른 터치 센싱 장치에 대하여 도면을 참고하여 상세하게 설명하고, 도면 부호에 관계없이 동일하거나 대응하는 구성 요소는 동일한 참조 번호를 부여하고 이에 대한 중복되는 설명은 생략하기도 한다.Now, a touch sensing device according to an embodiment of the present invention will be described in detail with reference to the drawings, and the same or corresponding elements are denoted by the same reference numerals regardless of the reference numerals, and redundant description thereof will be omitted. .
도 1 은 본 발명의 일실시예에 따른 터치 센싱 장치의 모식도이고, 도 2 는 본 발명의 일실시예에 따른 터치 센싱 장치의 단면도이며, 도 3 은 본 발명의 일실시예에 따른 터치 센싱 장치의 동작상태를 설명하는 모식도이다.1 is a schematic diagram of a touch sensing device according to an embodiment of the present invention, Figure 2 is a cross-sectional view of the touch sensing device according to an embodiment of the present invention, Figure 3 is a touch sensing device according to an embodiment of the present invention It is a schematic diagram explaining the operation state of.
도 1 을 참조하면, 본 발명의 일실시예에 따른 터치 센싱 장치는 기판(120), 제 1 도파층(140) 및 제 2 도파층(140)으로 구성되어 있다. 상기 기판위에 형성되는 제 1 도파층(140)은 주광로(101)와 분기광로(102)로 구성된 제 1 코어(100) 및 제 1 코어의 광로 횡방향 양측을 감싸도록 배치되는 제 1 클래딩(130)으로 구성된다. 또한 제 1 코어의 주광로상에 분기광로의 분기위치에 배치되는 스플리터(103)를 포함한다.Referring to FIG. 1, a touch sensing device according to an embodiment of the present invention is composed of a substrate 120, a first waveguide layer 140, and a second waveguide layer 140. The first waveguide layer 140 formed on the substrate has a first cladding disposed to surround both sides of the first core 100 composed of the main optical path 101 and the branch optical path 102 and the optical path transverse sides of the first core. It consists of 130. It further includes a splitter 103 arranged on the main optical path of the first core at the branch position of the branch optical path.
상기 기판(120)은 터치 센싱 장치로 동작하기 위하여 투명물질인 필름이나 강화유리로 형성이 가능하지만 이것에 한정되는 것은 아니며 불투명 기판을 응용할 수도 있다.The substrate 120 may be formed of a transparent film or tempered glass in order to operate as a touch sensing device, but is not limited thereto. An opaque substrate may be applied.
제 2 도파층(160)는 제 1 도파층(140) 과 동일한 구조를 가지며, 제 1 도파층(140) 위에 형성된다. 다만, 제 2 도파층(160)의 주광로(201)는 제 1 도파층(140)의 주광로(101)와 연장방향이 상호 수직이 되도록 배치된다.The second waveguide layer 160 has the same structure as the first waveguide layer 140 and is formed on the first waveguide layer 140. However, the main optical path 201 of the second waveguide layer 160 is disposed such that the main optical path 101 of the first waveguide layer 140 and the extending direction are perpendicular to each other.
이하에서는 제 1 도파층(140)을 기준으로 그 구조를 더욱 상세히 설명한다.Hereinafter, the structure of the first waveguide layer 140 will be described in more detail.
제 1 코어(100)는 상기 기판(120) 위에 형성되는데, 제 1 코어(100)는 주광로(101)와 분기광로(102)로 이루어져 있으며, 상기 주광로(101) 내부에 존재하는 스플리터(103)가 주광로의 일측단에 배치된 광원(L1)으로부터 입사된 입사광이 주광로(101)를 전반사하며 진행할 때, 진행하는 입사광을 분기광로(102)방향으로 분기시킨다.The first core 100 is formed on the substrate 120. The first core 100 is composed of a main path 101 and a branch path 102, and a splitter existing in the main path 101. When the incident light incident from the light source L1 disposed at one end of the main light path 103 is totally reflected through the main light path 101, the incident light splits the advancing incident light toward the branch light path 102.
상기 스플리터(103)가 주광로(101)상을 전반사하며 진행하는 입사광을 분기광로(102) 방향으로 분기시키기 위하여, 상기 스플리터(103)는 제 1 코어(100)와 굴절율의 차이를 가져야한다. 또한 주광로(101)의 연장방향의 수직방향으로 분기광로(102)가 복수개 존재하므로 입사광을 각 분기광로(102)로 주광로(101)에서 각각 분기시키기 위하여 상기 스플리터(103)는 분기광로(102)의 수만큼 존재한다.In order to split the incident light propagating through the main optical path 101 onto the main optical path 101 in the direction of the branch optical path 102, the splitter 103 must have a difference in refractive index from that of the first core 100. . In addition, since there are a plurality of branch light paths 102 in the vertical direction of the main light path 101 in the extending direction, the splitter 103 branches to split the incident light from the main light path 101 into the respective branch light paths 102. There are as many as optical paths 102.
제 1 코어(100)의 광로 횡방향 양측을 감싸도록 배치되는 제 1 클래딩(130)은 제 1 코어(100)을 이루는 물질과의 굴절률 차를 가지며 이로 인하여 내부 전반사가 발생하여 광신호가 전달되는 것이다. 본 실시예에서는 제 1 클래딩(130)이 제 1 코어(100) 물질보다 굴절률이 작은 것이 바람직하나 반드시 이에 한정되는 것은 아니다.The first cladding 130 disposed to surround both sides of the optical path transverse direction of the first core 100 has a difference in refractive index with a material forming the first core 100, and as a result, total internal reflection occurs to transmit an optical signal. . In the present embodiment, it is preferable that the first cladding 130 has a smaller refractive index than the material of the first core 100, but is not necessarily limited thereto.
앞서 설명한대로, 제 2 도파층(160)은 제 1 도파층(140)과 동일한 구조를 가지며, 제 1 도파층(140) 위에 형성된다.As described above, the second waveguide layer 160 has the same structure as the first waveguide layer 140 and is formed on the first waveguide layer 140.
한편, 제 1 코어의 주광로(101) 및 제 2 코어의 주광로(201) 일측단에 광원(L1,L2)이 배치되고, 상기 제 1 및 제 2 코어의 주광로가 인접 형성된 변의 대향변들을 따라 배치되며, 제 1 및 제 2 코어의 분기광로의 출사단으로부터 수광 가능하도록 복수의 광센서(110,210)가 배치된다.On the other hand, light sources L1 and L2 are disposed at one end of the main light path 101 of the first core and the main light path 201 of the second core, and the opposite sides of the sides where the main light paths of the first and second cores are adjacent to each other. And a plurality of optical sensors 110 and 210 are arranged to be able to receive light from the exit ends of the branch paths of the first and second cores.
도 2는 제 2 도파층(160)의 분기 광로(202)를 따라 절단된 터치 센싱 장치의 단면도를 나타낸다.2 illustrates a cross-sectional view of the touch sensing device cut along the branching optical path 202 of the second waveguide layer 160.
제 1 도파층(140)과 제 2 도파층(160)은 접착층(150)에 의하여 접착되며, 제 2 도파층(160)은 제 1 도파층(140)의 상부에 형성되며, 접착층(150)에 의하여 접착된다. 도 2는 접착층(150)을 도시하는데, 제 1 클래딩(130) 물질과 동일한 물질이 사용가능함은 물론이다.The first waveguide layer 140 and the second waveguide layer 160 are bonded by the adhesive layer 150, the second waveguide layer 160 is formed on the first waveguide layer 140, and the adhesive layer 150 Is bonded. 2 shows the adhesive layer 150, although the same material as the first cladding 130 material may be used.
제 1 도파층(140)의 상부에 제 2 도파층(160)이 결합하되 분기광로들이 서로 격자 구조를 이루어 터치 영역을 형성한다. 접착층의 물질이 제 1 클래딩(130)과 다른 물질이 사용될 때에는 접착층(150)의 굴절율은 제 1 및 제 2 코어의 각 굴절율보다 작은 것이 바람직하다.The second waveguide layer 160 is coupled to the upper portion of the first waveguide layer 140, but the branched light paths form a lattice structure to form a touch area. When the material of the adhesive layer is different from that of the first cladding 130, the refractive index of the adhesive layer 150 is preferably smaller than the respective refractive indices of the first and second cores.
도 1 내지 도 3 을 참조하여 본 발명의 동작을 설명하면, 만일 손가락 등에 의하여 제 2 도파층(160)의 상부에 접촉이 발생하게 되면 제 2 코어(200)의 분기광로(202)를 진행하는 빛의 전반사가 손상된다. 전반사가 손상된 해당 광로의 광센서(210)에는 광량 변화가 검출된다.Referring to FIGS. 1 to 3, when the contact occurs on the upper portion of the second waveguide layer 160 by a finger or the like, the branch optical path 202 of the second core 200 is advanced. The total reflection of the light is damaged. A change in the amount of light is detected in the optical sensor 210 of the optical path in which total reflection is damaged.
또한 접촉이 발생된 위치의 제 2 코어(200)의 분기광로(202)의 광로가 변형되면서 그 아래 제 1 도파층(140)에 존재하는 제 1 코어(100)의 분기광로(102)의 광로가 변형된다. 이러한 제 1 코어의 분기광로(102)의 변형으로 인하여 제 1 코어(100)의 분기광로(102)를 진행하는 빛의 전반사가 손상되며 해당 광로의 광센서(110)에서 광량변화가 검출 된다.In addition, as the optical path of the branched light path 202 of the second core 200 at the position where the contact is made is deformed, the branched light path 102 of the first core 100 existing in the first waveguide layer 140 thereunder. The optical path of is transformed. Due to the deformation of the branch optical path 102 of the first core, total reflection of the light traveling through the branch optical path 102 of the first core 100 is damaged, and the light quantity change is detected by the optical sensor 110 of the corresponding optical path. do.
즉, 제 1 및 제 2 코어의 각 분기광로(102,202)에 얼라인 된 광센서(110,210)들이 변형이 일어난 위치를 지나는 제 1 및 제 2 코어의 분기광로의 광량변화를 감지하게 되고, 이를 이용하여 손가락 등이 접촉된 2차원적 위치를 검출할 수 있게 된다.That is, the optical sensors 110 and 210 aligned to the respective branch optical paths 102 and 202 of the first and second cores sense a change in the amount of light of the branch optical paths of the first and second cores passing through the deformation position. It is possible to detect the two-dimensional position where the finger or the like is in contact.
앞에서 설명된 본 발명의 일실시예는 본 발명의 기술적 사상을 한정하는 것으로 해석되어서는 아니된다. 본 발명의 보호범위는 청구범위에 기재된 사항에 의하여만 제한되고, 본 발명의 기술분야에서 통상의 지식을 가진 자는 본 발명의 기술적 사상을 다양한 형태로 개량 변경하는 것이 가능하다. 따라서, 이러한 개량 및 변경은 통상의 지식을 가진 자에게 자명한 것인 한 본 발명의 보호범위에 속하게 될 것이다.One embodiment of the present invention described above should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.
100 : 제 1 코어 101 : 제 1 코어의 주광로100: first core 101: main path of the first core
102 : 제 1 코어의 분기광로 103 : 제 1 코어의 스플리터102: branching path of the first core 103: splitter of the first core
110 : 광센서 120 : 기판110: light sensor 120: substrate
130 : 제 1 클래딩 140 : 제 1 도파층130: first cladding 140: first waveguide layer
150 : 접착층 160 : 제 2 도파층150: adhesive layer 160: second waveguide layer
200 : 제 2 코어 201 : 제 2 코어의 주광로200: second core 201: main path of the second core
202 : 제 2 코어의 분기광로 203 : 제 2 코어의 스플리터202: branching path of the second core 203: splitter of the second core
L1,L2 : 광원L1, L2: light source

Claims (7)

  1. 사각형상의 기판;Rectangular substrate;
    상기 기판 위에 형성되며, 기판의 일측변과 인접하여 나란히 연장되는 주광로와 주광로의 연장방향과 수직방향으로 분기된 복수개의 분기광로로 이루어진 제 1 코어,A first core formed on the substrate, the first core including a main optical path extending in parallel with one side of the substrate and a plurality of branch optical paths branched in a direction perpendicular to the extension direction of the main optical path,
    제 1 코어보다 작은 굴절률을 갖는 물질로서 상기 기판 위에 형성되며, 제 1 코어의 광로 횡방향 양측을 감싸도록 배치되는 제 1 클래딩 및 상기 제 1 코어의 주광로상에 분기광로의 분기위치에 배치되며, 상기 제 1 코어와 굴절율 차이를 갖고, 제 1 코어의 주광로로부터 제 1 코어의 분기광로 방향으로 입사광의 일부를 반사하도록 입사광에 대하여 지향각을 갖도록 형성되는 복수의 스플리터를 포함하는 제 1 도파층; 및A material having a refractive index smaller than that of the first core, and formed on the substrate, the first cladding disposed to surround both sides of the optical path in the optical path in the first core, and disposed at the branching position of the branching light on the main optical path of the first core; And a plurality of splitters having a refractive index difference from the first core and having a directing angle with respect to the incident light so as to reflect a part of the incident light in the direction of the branched light path of the first core from the main light path of the first core. Waveguide layer; And
    제 1 도파층 위에 형성되며, 상기 일측변과 수직한 다른 한변에 인접하여 나란히 연장되는 주광로와 주광로의 연장방향과 수직방향으로 분기된 복수개의 분기광로로 이루어진 제 2 코어, 제 2 코어보다 작은 굴절률을 갖는 물질로서 상기 기판 위에 형성되며, 제 2 코어의 광로 횡방향 양측을 감싸도록 배치되는 제 2 클래딩 및 상기 제 2 코어의 주광로상에 분기광로의 분기위치에 배치되며, 상기 제 2 코어와 굴절율 차이를 갖고, 제 2 코어의 주광로로부터 제 2 코어의 분기광로 방향으로 입사광의 일부를 반사하도록 입사광에 대하여 지향각을 갖도록 형성되는 복수의 스플리터를 포함하는 제 2 도파층;을 포함하는 터치 센싱 장치.A second core and a second core which are formed on the first waveguide layer and include a main light path extending side by side adjacent to the other side perpendicular to the one side and a plurality of branch light paths branched in a direction perpendicular to the extension direction of the main light path; A material having a small refractive index formed on the substrate, the second cladding disposed to surround both sides of the optical path transverse direction of the second core and the branched path on the main optical path of the second core, the second cladding and the second cladding. A second waveguide layer having a difference in refractive index from the core and including a plurality of splitters having a directing angle with respect to the incident light so as to reflect a part of the incident light in the direction of the branching path of the second core from the main optical path of the second core; Touch sensing device comprising.
  2. 제 1항에 있어서,The method of claim 1,
    제 1 코어의 주광로 및 제 2 코어의 주광로 일측단에 광원이 배치되고, 상기 제 1 및 제 2 코어의 주광로가 인접 형성된 변의 대향변들을 따라 배치되며, 제 1 및 제 2 코어의 분기광로의 출사단으로부터 수광 가능하도록 배치된 복수의 광센서를 포함하는 터치 센싱 장치.The light source is disposed at one end of the main light path of the first core and the main light path of the second core, and the main light paths of the first and second cores are disposed along opposite sides of the adjacent side, and the branch of the first and second cores. Touch sensing device comprising a plurality of optical sensors arranged to receive light from the exit of the optical path.
  3. 제 1 항 또는 제 2 항에 있어서,The method according to claim 1 or 2,
    상기 제 1층과 제 2층은 접착층에 의하여 접착되며, 접착층의 굴절율은 제 1 코어 및 제 2 코어의 각 굴절율보다 작은 터치 센싱 장치.And the first and second layers are bonded by an adhesive layer, and the refractive index of the adhesive layer is smaller than the respective refractive indices of the first core and the second core.
  4. 제 1항 또는 제 2 항에 있어서,The method according to claim 1 or 2,
    상기 접착층은 제 1 클래딩과 동일한 재료인 것을 특징으로 하는 터치 센싱장치.And the adhesive layer is made of the same material as the first cladding.
  5. 제 1항에 있어서,The method of claim 1,
    상기 스플리터는 제 1 클래딩 또는 제 2 클래딩과 동일한 굴절률을 갖는 물질로 형성된 것을 특징으로 하는 터치 센싱 장치.And wherein the splitter is formed of a material having the same refractive index as that of the first cladding or the second cladding.
  6. 제 1항에 있어서,The method of claim 1,
    상기 스플리터는 공기로 형성된 것을 특징으로 하는 터치 센싱 장치.The splitter is a touch sensing device, characterized in that formed with air.
  7. 제 1항에 있어서,The method of claim 1,
    상기 기판은 수지필름 또는 유리인 터치 센싱 장치.The substrate is a touch sensing device that is a resin film or glass.
PCT/KR2011/000442 2010-11-22 2011-01-21 Touch sensing device having two-layered structure WO2012070719A1 (en)

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