WO2015043293A1 - 光触控屏以及显示装置 - Google Patents

光触控屏以及显示装置 Download PDF

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Publication number
WO2015043293A1
WO2015043293A1 PCT/CN2014/082422 CN2014082422W WO2015043293A1 WO 2015043293 A1 WO2015043293 A1 WO 2015043293A1 CN 2014082422 W CN2014082422 W CN 2014082422W WO 2015043293 A1 WO2015043293 A1 WO 2015043293A1
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WO
WIPO (PCT)
Prior art keywords
transmission channel
optical
light
sensor
optical transmission
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2014/082422
Other languages
English (en)
French (fr)
Inventor
周伯柱
白明基
段献学
陈程
杨成绍
操彬彬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Hefei BOE Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Hefei BOE Optoelectronics Technology Co Ltd
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
Application filed by BOE Technology Group Co Ltd, Hefei BOE Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US14/436,020 priority Critical patent/US10139939B2/en
Publication of WO2015043293A1 publication Critical patent/WO2015043293A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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 OR CALCULATING; 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
    • G06F3/0428—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by sensing at the edges of the touch surface the interruption of optical paths, e.g. an illumination plane, parallel to the touch surface which may be virtual
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0045—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped light guide
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G06F3/0386—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry for light pen

Definitions

  • At least one embodiment of the present invention is directed to an optical touch screen and display device. Background technique
  • the touch screen has many advantages such as easy communication, and the user can operate the host by gently touching the icon or text displayed on the computer screen with a finger, thereby making the human-computer interaction more straightforward. Therefore, the touch technology greatly facilitates the interactive dialogue between the user and the display screen.
  • a touch screen is an input device that replaces a keyboard and a mouse.
  • the input device mainly includes a touch panel, a controller, a device driver, and an application attached to the monitor.
  • the touch panel is formed of a specially treated ITO glass or ITO film for sensing the signal input by the user.
  • the position recognition sensor senses a touched position on the touch panel when the surface of the touch panel is touched by a hand or a touch pen. Since the hand or the touch pen directly contacts the touch panel, fingerprints are left on the surface of the touch panel or scratches are caused, which affects the life of the display.
  • the display cannot be directly touched, thus limiting the application of such touch screens.
  • the optical touch screen 100 includes an optical touch panel 110 and two sensors 120 and 130.
  • the optical touch panel 110 includes an infrared phosphor material capable of emitting light when exposed to infrared light.
  • the sensors 120, 130 are respectively disposed at different corners of the optical touch panel 110. When the area illuminated by the infrared ray on the optical touch panel 110 emits light, the two sensors 120, 130 respectively receive the emitted light, and detect and position the illuminating position by means of triangulation.
  • Embodiments of the present invention provide an optical touch screen and a display device, which can improve positioning accuracy of a touch position.
  • At least one embodiment of the present invention provides an optical touch screen including an optical touch panel, a first sensor, and a second sensor.
  • the optical touch panel includes a first optical transmission channel and a second optical transmission channel, where the first optical transmission channel and the second optical transmission channel intersect; the first sensor is disposed in the first optical transmission channel At least one end for receiving light emitted by the first optical transmission channel; the second sensor being disposed at at least one end of the second optical transmission channel for receiving a second optical transmission channel Light.
  • At least another embodiment of the present invention also provides a display device including the above optical touch screen.
  • 1 is a schematic structural view of an optical touch screen
  • FIG. 2 is a schematic structural diagram of an optical touch screen according to an embodiment of the present invention.
  • FIG. 3 is a partially enlarged schematic view of the optical touch panel of FIG. 2;
  • FIG. 4 is a cross-sectional view of the optical touch panel in the A-A direction of FIG. 3 according to another embodiment of the present invention.
  • FIG. 5 is a cross-sectional view of the optical touch panel of FIG. 3 taken along line B-B of FIG. 3 according to another embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a light propagation path of an optical touch screen according to still another embodiment of the present invention
  • FIG. 7 is a schematic diagram of a display device according to still another embodiment of the present invention.
  • Words such as “connected” or “connected” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
  • “Upper”, “Bottom”, “Left”, “Right”, etc. are only used to indicate relative positional relationships. When the absolute position of the object being described is changed, the relative positional relationship may also change accordingly.
  • the optical touch screen 100 shown in FIG. 1 uses triangulation to locate the position of the light-emitting point, so that the positions on the display plane are not linear with the measured angle, which affects the accurate positioning of the touch position. degree.
  • FIG. 2 is a schematic structural diagram of an optical touch screen 200 according to an embodiment of the present invention.
  • the optical touch screen 200 includes an optical touch panel 210, and a first optical transmission channel 211 and a second optical transmission channel 212 are disposed in the optical touch panel 210.
  • the optical touch screen 200 is further provided with a first sensor 220 and a second sensor 230.
  • the first sensor 220 is disposed at at least one end of the first optical transmission channel 211 for receiving light emitted by the first optical transmission channel 211;
  • the second sensor 230 is disposed at at least one end of the second optical transmission channel 212, For receiving light emitted by the second light transmission channel 212.
  • the first sensor 220 and the second sensor 230 may be disposed outside the optical touch panel 210 or may be disposed on the optical touch panel 210. Further, the first sensor 220 and the second sensor 230 may be disposed in their corresponding optical transmissions. One or both ends of the channel. In the case shown in FIG. 2, the first optical transmission channel 211 and the second optical transmission channel 212 intersect, for example, in an orthogonal relationship. The first optical transmission channel 211 and the second optical transmission channel 212 may also be non-positive according to requirements. Cross relationship. In the case shown in FIG.
  • the optical touch panel 210 has a plurality of first optical transmission channels 211 and a plurality of second optical transmission channels 212, a plurality of first sensors 220 and a plurality of second sensors 230, and a plurality of First sensing
  • the device 220 corresponds to the plurality of first optical transmission channels 211
  • the plurality of second sensors 230 correspond to the plurality of second optical transmission channels 212.
  • the first sensor 220 and the second sensor 230 may be light sensors that convert optical signals into electrical signals, for example, may include photodiodes or infrared sensors.
  • Each intersection of the first optical transmission channel 211 and the second optical transmission channel 212 can be regarded as a light-emitting position, thereby forming a rectangular coordinate system on the touch panel; on the optical touch screen 200
  • the light emitted from the position can be simultaneously emitted along the first optical transmission channel 211 and the second optical transmission channel 212, and the optical signals are detected by the first sensor 220 and the second sensor 230, respectively, so that it can be determined.
  • the coordinates of the illuminating position In this way, the positions on the touch panel form a linear relationship with the measured coordinates, thereby improving the positioning accuracy of the touch position.
  • the first optical transmission channel 211 and the second optical transmission channel 212 are closely arranged on the optical touch panel (correspondingly
  • the first sensor 220 and the second sensor 230) arranged closely around the optical touch panel may have extremely small orthogonal points.
  • 3 is a partially enlarged schematic view of the optical touch panel of FIG. 2, which is only for the convenience of the reader and is not limited to the embodiment of the present invention.
  • the center of the illuminated area of the light touch panel 210 falls at one or more orthogonal points or deviates from the orthogonal point, but in either case, the light touch
  • the illuminated area on the control panel will cover an orthogonal point.
  • the first optical transmission 211 and the second optical transmission channel 212 can play a central role in guiding the light, so that the light emitted by the orthogonal points propagates along the first optical transmission channel 211 and the second optical transmission channel 212 at the same time, and finally
  • the first sensor 220 and the second sensor 230 corresponding to each channel detect the optical signal, thereby determining the coordinates of the light-emitting position.
  • the path of light propagation in the optical touch panel is not limited to these two paths.
  • the first optical transmission channel 211 is set to the X direction, and the horizontally right direction in the figure is the X main direction; the second optical transmission channel 212 is set to the Y direction, and in the figure The direction vertically upward is the Y main direction; any one of the orthogonal points between the first optical transmission channel 211 and the second optical transmission channel 212 is set to 0.
  • the propagation path of the light is mainly divided into four optical paths, which are respectively 1, 2, 3, and 4 labeled in FIG. 6, wherein 1 is a main direction optical transmission channel in the Y direction, and 2 is a main direction optical transmission channel in the X direction. 3 is a secondary direction optical transmission channel in the X direction, and 4 is an optical transmission channel in a non-detection direction.
  • any one of the illuminating points 0 is excited, and the stimulated light will travel in all directions, most of which
  • the splitting is along the main direction of the optical transmission channel, such as the optical path 1, 2, so that the light in the X, Y direction is received by the sensor; in the secondary direction of the optical transmission channel, such as the optical path 3, after the light is reflected (including total reflection) Propagation in the transmission channel, and finally received by the sensor; in other directions, such as optical path 4, the light mainly refracts, its propagation path is relatively long, and the loss of light is more, and finally may not be detected by any one sensor. .
  • the light of the optical path 4 may eventually be detected by entering a certain sensor, but in this case, the light intensity of the light transmission channel in the non-detection direction is compared with the light intensity of the main light transmission channel of the light-emitting point. A lot smaller (the light intensity of the main light transmission channel is the sum of the light intensity of the main direction and the secondary direction of the light transmission channel).
  • a light intensity threshold may be set for the sensor, so that the interference in the non-detecting direction may be excluded, that is, the first sensor 220 is provided with the first A light intensity threshold is used for comparison with the light intensity detected by the first sensor 220, and the second sensor 230 is provided with a second light intensity threshold for comparison with the light intensity detected by the second sensor 230.
  • the optical signal can be judged by, for example, a central processing unit (an example of a controller), and the light is determined by calculation. The location of the point.
  • a central processing unit an example of a controller
  • the central processor determines that the light intensity detected by the first sensor 220 is greater than or equal to the first light intensity threshold, the position of the light-emitting point in the Y direction is determined by calculation, and if it is smaller than the first light intensity threshold, Performing the calculation of the next step; the central processor determines that the light intensity detected by the second sensor 230 is greater than or equal to the second light intensity threshold, and determines the position of the light-emitting point in the X direction by calculation, if less than the second light intensity threshold At the time, the next calculation is not performed.
  • the central processing unit determines that the light intensity (such as the light intensity of the X-direction and Y-direction transmission channels described above) reaches the set light intensity threshold
  • the coordinates of the light-emitting position are determined by calculation; if the light intensity is determined ( If the light intensity in the non-detection direction does not reach the set light intensity threshold, the next calculation is not performed, so that the interference of the background light (such as the light in the non-detection direction) can be effectively removed, thereby realizing the position of the light.
  • the specific numerical ranges of the first light intensity threshold and the second light intensity threshold should be based on practical applications.
  • the setting is not specifically limited here.
  • the infrared touch phosphor material is used in the optical touch panel 110 of FIG. 1 to realize remote control display. Screen, this material is excited by an invisible infrared laser.
  • the infrared light has no visibility, which makes it easy to accidentally touch the optical touch panel 110, which is inconvenient for practical use.
  • At least one embodiment of the present invention uses an up-converting luminescent material to implement a remote control display screen.
  • the up-converting luminescent material can be excited by visible light, and visible light is not only easily accessible in practice (for example, a commonly used laser pointer) but also has Visibility can avoid accidentally touching the light touch panel 210.
  • the up-converting luminescent material is generally formed on a transparent substrate as a base medium, and the first optical transmission channel 211 and the second optical transmission channel 212 are formed by, for example, an etching process or other patterning process.
  • the luminescence mechanism of the up-converting luminescent material is anti-stokes, that is, long-wavelength light excites short-wavelength light, such as infrared light excites visible light, red light excites yellow light, or visible light excites Ultraviolet light.
  • the upconversion luminescence of such materials generally occurs in compounds doped with rare earth ions, including fluorides, oxides, sulfur compounds, oxyfluorides, halogens, and the like, or combinations thereof.
  • upconversion luminescent materials have been absorbed and upconverted by wavelengths of 600 to 1100 nm to excite visible light such as red, green or blue light.
  • the touch light source in at least one embodiment of the present invention uses visible light, and the above-mentioned up-converting luminescent material emits visible light or invisible light when exposed to visible light.
  • the wavelength of visible light that can be absorbed by the up-converting luminescent material depends on the type of the material.
  • the above-mentioned conversion luminescent material absorbs 618 nm of orange-red visible light, which is an alternative to the embodiment of the present invention.
  • the up-converting luminescent material absorbs 618 nm of orange red light, It is capable of upconverting to excite blue light at 487 nm.
  • the optical touch panel 210 may include a first substrate, such as a first transparent substrate 213, on the first transparent substrate 213.
  • a first substrate such as a first transparent substrate 213, on the first transparent substrate 213.
  • An up-conversion luminescent material is provided, and a first light transmission channel 211 and a second light transmission channel (not shown in FIG. 4) are formed on the first transparent substrate 213 by, for example, an etching process or other patterning process.
  • the optical touch panel 210 may also be a sandwich-like structure, and the upper and lower layers are respectively a second substrate and a first substrate, for example, a second transparent substrate 214 and The first transparent substrate 213, the intermediate layer is an up-conversion luminescent material, and the up-converting luminescent material of the intermediate layer forms a first optical transmission channel on the first transparent substrate 213 by, for example, an etching process or other patterning process (not shown in FIG. 5) And a second optical transmission channel 212.
  • the structure of the sandwich protects the upconverting luminescent material from contact with the outside.
  • the materials of the first transparent substrate 213 and the second transparent substrate 214 may be both glass or resin, or one glass is a resin, and the like.
  • a space other than the first light transmission channel 211 and the second light transmission channel 212 between the first transparent substrate 213 and the second transparent substrate 214 may be filled with, for example, a protective layer for protecting the up-converting luminescent material from being prevented. The conversion luminescent material is damaged.
  • the protective layer may be, for example, a vacuum, or an inert gas such as an inert gas ( ⁇ , ⁇ , argon, neon, krypton, xenon), nitrogen, or the like that does not react with the upconverting luminescent material. gas.
  • an inert gas such as an inert gas ( ⁇ , ⁇ , argon, neon, krypton, xenon), nitrogen, or the like that does not react with the upconverting luminescent material. gas.
  • the first transparent substrate 213 and the second transparent substrate 214 do not interact with visible light, so that visible light can be directly incident on the upper conversion luminescent material through the transparent substrate, and has no influence on the touch of the optical touch panel 210.
  • At least one embodiment of the present invention also provides a display device, as shown in FIG. 7, including a display main body 340 and an optical touch screen 300 disposed on a display side of the display main body 340.
  • the optical touch screen 300 includes an optical touch panel 310, at least one first sensor 320, and at least one second sensor 330.
  • the light touch panel 310 is mounted in the display body 340.
  • the at least one first sensor 320 and the at least one second sensor 330 are embedded between the display body 340 and the optical touch panel 310, for example.
  • a plurality of first optical transmission channels 311 and a plurality of second optical transmission channels 312 are provided.
  • the first optical transmission channel 311 and the second optical transmission channel 312 are orthogonal to each other, for example; the at least one first sensor 320 is disposed at the first One end of the optical transmission channel 311 is configured to receive light emitted by the first optical transmission channel 311; the at least one second sensor 330 is disposed at one end of the second optical transmission channel 312 for receiving by the second optical transmission channel 312 The light emitted.
  • the first optical transmission channel 211 and the second optical transmission channel 312 are orthogonal to each other.
  • Each intersection of the first optical transmission channel 311 and the second optical transmission channel 312 can be regarded as a light-emitting position, so as to form a rectangular coordinate system on the touch panel, and a certain one on the optical touch panel 310.
  • the light emitted from the position can be simultaneously emitted along the first light transmission channel 311 and the second light transmission channel 312, and the light signals are detected by the first sensor 320 and the second sensor 330, respectively, so that the light-emitting position can be determined.
  • the coordinates of the touch panel form a linear relationship with the measured coordinates, thereby improving the positioning accuracy of the touch position.
  • the display body 340 can be any type of display device, such as a liquid crystal display device, an organic light emitting diode display device, an inorganic diode display device, a plasma display device, a cathode ray tube Device, etc.
  • optical touch screen 300 Since the specific implementation manner of the optical touch screen 300 has been described in detail in the foregoing, it will not be further described herein.
  • the first optical transmission channel 311 and the second optical transmission channel 312 are formed from an upconverting luminescent material.
  • the light is incident on the up-conversion material, and the up-converting material is excited to convert into visible light or invisible light, and the transmission channel and the Y direction in the X direction.
  • the transmission channel propagates, and the first sensor 320 and the second sensor 330 detect the optical signal and then perform processing by, for example, a central processing unit, thereby obtaining the light-emitting position of the optical touch panel 310.
  • a first sensor and a second sensor may be employed, for example, the first sensor and the second sensor employ a sensor having a position resolution function.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Optics & Photonics (AREA)
  • Position Input By Displaying (AREA)

Abstract

一种光触控屏以及显示装置，该光触控屏(200)包括光触控面板(210) 以及第一传感器(220)和第二传感器(230)；所述光触控面板(210)包括第一光传输通道(211)和第二光传输通道(212)，所述第一光传输通道(211) 和所述第二光传输通道(212)相交；所述第一传感器(220)设置在所述第一光传输通道(211)的至少一端，用于接收由所述第一光传输通道(211) 发出的光；所述第二传感器(230)设置在所述第二光传输通道(212)的至少一端，用于接收由所述第二光传输通道(212)发出的光。该光触控屏以及显示装置能够提高触控位置的定位精确度。

Description

光触控屏以及显示装置 技术领域
本发明的至少一个实施例涉及一种光触控屏以及显示装置。 背景技术
随着触控技术和显示技术的广泛应用，人们越来越多地接触到了触摸屏。 触摸屏具有易于交流等许多优点， 用户只要用手指轻轻地触碰计算机显示屏 上显示的图符或文字就能实现对主机的操作，从而使人机交互更为直截了当。 因而这种触控技术极大地方便了用户与显示屏之间的交互对话。
一般而言， 触摸屏是一种代替键盘和鼠标的输入装置， 这种输入装置主 要包括附着于监视器上的触摸面板、 控制器、 装置驱动器和应用程序。 触摸 面板由经过特殊处理的用来感测用户输入的信号的 ITO玻璃或 ITO膜形成。 当触摸面板的表面被手或者触摸笔触摸时， 位置识别传感器感测触摸面板上 的触摸位置。 由于手或者触摸笔直接接触触摸面板， 从而在触摸面板的表面 留下指纹或者导致划痕， 影响显示屏的使用寿命。 而且， 在有些特别的应用 场合， 如车站、 机场、 商场等应用大尺寸显示屏的公共场合， 不能直接近距 离地接触显示屏， 因而限制了该类触摸屏的应用。
发明人已知的一种技术提供了一种可以避免直接接触显示屏， 并能远距 离控制显示屏的光触控屏方案。 如图 1所示， 这种光触控屏 100包括光触控 板 110、 两个传感器 120、 130， 其中光触控板 110包括当暴露于红外光时能 够发光的红外磷光体材料， 两个传感器 120、 130 分别设置在光触控板 110 的不同角落处。 当光触控板 110上被红外线照射的区域发光时， 两个传感器 120、 130分别接收所发射的光， 利用三角测量的方式对发光位置进行检测定 位。 发明内容
本发明的实施例提供一种光触控屏以及显示装置， 能够提高触控位置的 定位精确度。 本发明的至少一个实施例提供了一种光触控屏， 包括光触控面板、 第一 传感器和第二传感器。 所述光触控面板包括第一光传输通道和第二光传输通 道， 所述第一光传输通道和所述第二光传输通道相交； 所述第一传感器设置 在所述第一光传输通道的至少一端， 用于接收由所述第一光传输通道发出的 光； 所述第二传感器设置在所述第二光传输通道的至少一端， 用于接收由所 述第二光传输通道发出的光。
本发明的至少另一个实施例还提供了一种显示装置，包括上述光触控屏。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例的附图作 简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例， 而非对本发明的限制。
图 1为一种光触控屏的结构示意图；
图 2为本发明的一个实施例提供的光触控屏的结构示意图；
图 3为图 2中的光触控面板的局部放大示意图；
图 4为本发明的另一实施例提供的光触控面板沿图 3中 A-A方向的剖视 示意图；
图 5为本发明的再一实施例提供的光触控面板沿图 3中 B-B方向的剖视 示意图；
图 6为本发明的再一实施例提供的光触控屏的光的传播路径示意图； 图 7为本发明的再一实施例提供的显示装置的示意图。
附图标记：
100-光触控屏， 110-光触控面板， 120、 130-传感器， 200、 300-光触控屏， 210、 310-光触控面板， 211、 311-第一光传输通道， 212、 312-第二光传输通 道， 213-第一透明基板， 214-第二透明基板， 220-第一传感器， 230-第二传感 器， 310-光触控面板， 320-第一传感器， 330-第二传感器， 340-显示主体。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例的附图， 对本发明实施例的技术方案进行清楚、 完整地描述。显然， 所描述的实施例是本发明的一部分实施例， 而不是全部的实施例。 基于所描 述的本发明的实施例， 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例， 都属于本发明保护的范围。
除非另外定义， 本公开使用的技术术语或者科学术语应当为本发明所属 领域内具有一般技能的人士所理解的通常意义。 本公开中使用的 "第一" 、 "第二" 以及类似的词语并不表示任何顺序、 数量或者重要性， 而只是用来 区分不同的组成部分。 同样， "一个" 、 "一" 或者 "该" 等类似词语也不 表示数量限制， 而是表示存在至少一个。 "包括" 或者 "包含" 等类似的词 语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物 件及其等同， 而不排除其他元件或者物件。 "连接" 或者 "相连" 等类似的 词语并非限定于物理的或者机械的连接， 而是可以包括电性的连接， 不管是 直接的还是间接的。 "上" 、 "下" 、 "左" 、 "右" 等仅用于表示相对位 置关系， 当被描述对象的绝对位置改变后， 则该相对位置关系也可能相应地 改变。
发明人注意到， 图 1所示的光触控屏 100釆用三角测量对发光点位置进 行定位的方式， 使得显示平面上各位置与测定角度不是线性关系， 这会影响 触控位置的定位精确度。
图 2为本发明的一个实施例提供的光触控屏 200的结构示意图。 本发明 实施例提供的光触控屏 200包括光触控面板 210， 光触控面板 210内设有第 一光传输通道 211和第二光传输通道 212。 光触控屏 200还设有第一传感器 220和第二传感器 230。所述第一传感器 220设置在第一光传输通道 211的至 少一端， 用于接收由第一光传输通道 211发出的光； 所述第二传感器 230设 置在第二光传输通道 212的至少一端， 用于接收由第二光传输通道 212发出 的光。第一传感器 220和第二传感器 230可以设置在光触控面板 210的外部， 也可以设置在光触控面板 210上； 此外， 第一传感器 220和第二传感器 230 可以设置在其对应的光传输通道的一端或两端。 如图 2所示的情形中， 第一 光传输通道 211和第二光传输通道 212相交， 例如可以是正交关系， 根据需 要第一光传输通道 211和第二光传输通道 212也可以非正交关系。 并且在图 2所示的情形中， 光触控面板 210具有多个第一光传输通道 211和多个第二 光传输通道 212，多个第一传感器 220和多个第二传感器 230，多个第一传感 器 220与多条第一光传输通道 211—一对应， 多个第二传感器 230与多条第 二光传输通道 212——对应。 第一传感器 220和第二传感器 230可以为光传 感器， 将光信号转换为电信号， 例如可以包括光电二极管或红外传感器。
第一光传输通道 211和第二光传输通道 212相互交叉的每一个交点都可 以看作是一个发光位置， 从而在触控面板上相当于形成一个直角坐标系； 在 光触控屏 200上的某一位置被光照射后， 该位置发出的光可以同时沿第一光 传输通道 211和第二光传输通道 212发出， 并分别由第一传感器 220和第二 传感器 230检测光信号， 从而可以确定发光位置的坐标。 这样使得触控面板 上的各位置与测定的坐标形成一个线性关系， 因而提高了触控位置的定位精 确度。
当本发明的至少一个实施例提供的光触控屏 200应用于实际的产品中 时， 第一光传输通道 211和第二光传输通道 212是紧密排布在光触控面板上 的 （相应地， 在光触控面板的周边也可以设有紧密排布的第一传感器 220和 第二传感器 230 ) ， 两者的正交点是极其微小的。 图 3为图 2中光触控面板 的局部放大示意图， 该图示仅为了便于读者的理解而非对本发明实施例的限 制。 当光源照射在光触控面板 210上时， 光触控面板 210被照亮区域的中心 正好落在某一个或多个正交点、 或者偏离正交点， 但是无论是哪种情况， 光 触控面板上被照亮的区域会覆盖某个正交点。 第一光传输通 211和第二光传 输通道 212能够对光起到集中导向的作用， 这样正交点发出的光同时沿第一 光传输通道 211和第二光传输通道 212传播， 最后分别由每个通道对应的第 一传感器 220和第二传感器 230检测光信号， 从而确定发光位置的坐标。
当然， 在光触控面板内光的传播的路径并不只限于这两条路径。 以下为 了便于说明， 如图 6所示， 将第一光传输通道 211设为 X方向， 且图中水平 朝右的方向为 X主方向； 第二光传输通道 212设为 Y方向，且图中竖直朝上 的方向为 Y主方向； 第一光传输通道 211和第二光传输通道 212之间任意一 个正交点设为 0点。 光的传播路径主要分为四条光学路径， 分别为图 6中标 注的①、 ②、 ③、 ④， 其中， ①为 Y方向的主方向光传输通道， ②为 X方向 的主方向光传输通道， ③为 X方向的次方向光传输通道， ④为非检测方向的 光传输通道。
任意激发一发光点 0， 受激发射的光会沿四周各个方向传播， 其中大部 分光沿光传输通道的主方向如光学路径①、 ②传播路径， 使得 X， Y方向的 光被传感器接收；在光传输通道的次方向，如光学路径③，光线经过反射（包 括全反射）后在传输通道内进行传播， 最后被传感器接收； 在其它方向， 如 光学路径④， 光线主要进行折射传播， 其传播路径相对较长、 且光的损耗较 多， 最后可能不被任何一个传感器检测到。 不过， 光学路径④的光线最终也 有可能进入某个传感器而被检测到， 但是此种情况下这条非检测方向的光传 输通道的光强度与发光点的主要光传输通道的光强度相比要小很多 (主要光 传输通道的光强度为光传输通道的主方向和次方向的光强度之和 ) 。
为避免非检测方向（如光学路径④）的光线影响发光位置的判断， 例如， 可以为传感器设定一个光强阔值， 从而可以将非检测方向的干扰排除， 即第 一传感器 220设有第一光强阔值， 用于与第一传感器 220检测到的光强度进 行比较， 第二传感器 230设有第二光强阔值， 用于与第二传感器 230检测到 的光强度进行比较。
可以理解的是， 由第一传感器 220和第二传感器 230检测到光信号后， 该光信号可以通过例如中央处理器（控制器的一个示例）对光强度进行判断 处理， 并通过计算来确定发光点的位置。 例如， 中央处理器判断第一传感器 220检测的光强度若大于或等于第一光强阔值时， 通过计算来确定发光点在 Y方向的位置， 若小于第一光强阔值时， 则不进行下一步的计算； 中央处理 器判断第二传感器 230检测的光强度若大于或等于第二光强阔值时， 通过计 算来确定发光点在 X方向的位置， 若小于第二光强阔值时， 则不进行下一步 的计算。
综合而言， 当中央处理器判断出光强度（如上述 X方向、 Y方向传输通 道的光强度）达到设定的光强阔值时， 则通过计算来确定发光位置的坐标； 如果判断出光强度（如上述非检测方向的光强度）未达到设定的光强阔值时， 则不进行下一步的计算， 这样可以有效去除背景光（如非检测方向的光） 的 干扰， 从而实现对发光位置的精确计算。
由于光源的类型很多， 不同类型的光源所需的光强阔值也不同， 且不同 产品的应用情况不同， 因此第一光强阔值和第二光强阔值的具体数值范围应 根据实际应用而设定， 此处不作具体限定。
图 1中的光触控面板 110中釆用红外磷光体材料以实现远距离控制显示 屏， 这种材料釆用不可见的红外激光进行激发。 但是在外界环境中， 能够发 出红外光的物体有很多， 尤其是高温物体， 并且红外光没有可视性， 这样容 易误触动光触控面板 110， 不方便实际应用。 本发明的至少一个实施例釆用 了上转换发光材料来实现远距离控制显示屏， 上转换发光材料通过可见光便 可受到激发， 而可见光在实际中不但容易获取（例如常用的激光笔） 而且具 有可视性， 可避免误触动光触控面板 210。
这种上转换发光材料通常以透明基板为基础介质， 通过例如刻蚀工艺或 其它构图工艺形成第一光传输通道 211和第二光传输通道 212。
上转换发光材料的发光机理为反-斯托克斯发光（Anti-Stokes ) ， 即长波 长的光激发出短波长的光， 比如红外线激发出可见光、 红光激发出黄光， 或 者可见光激发出紫外线。 这种材料的上转换发光过程一般发生在掺杂有稀土 离子的化合物中， 主要包括氟化物、 氧化物、 含硫化合物、 氟氧化物、 卤化 物等或它们的组合。 目前上转换发光材料已经实现将 600~1100nm的波长吸 收并上转换激发出红光、 绿光或蓝光等可见光。
根据上转换发光材料的发光机理， 本发明至少一个实施例中的触控光源 釆用可见光， 上述提到的上转换发光材料当暴露于可见光时会发出可见光或 不可见光。上转换发光材料能够吸收的可见光的波长根据其材料的种类而定， 这里以上转换发光材料吸收 618nm 的橙红可见光为本发明实施例可选的方 案， 当上转换发光材料吸收 618nm 的橙红光后， 能够上转换激发出 487nm 的蓝光。
对于光触控面板 210而言， 如图 4所示， 在本发明的另一实施中， 光触 控面板 210可以包括第一基板， 例如第一透明基板 213， 通过在第一透明基 板 213上设有上转换发光材料， 通过例如刻蚀工艺或其它构图工艺在第一透 明基板 213上形成第一光传输通道 211和第二光传输通道（图 4中未示出）。
如图 5所示， 在本发明的再一实施例中， 光触控面板 210还可以是类似 于三明治的结构， 上下层分别为第二基板和第一基板， 例如， 第二透明基板 214和第一透明基板 213， 中间层为上转换发光材料，通过例如刻蚀工艺或其 它构图工艺使中间层的上转换发光材料在第一透明基板 213上形成第一光传 输通道（图 5中未示出 )和第二光传输通道 212。 这种三明治的结构可以对 上转换发光材料起到保护作用， 避免上转换发光材料与外界接触。 在本发明的至少一个实施中， 第一透明基板 213和第二透明基板 214的 材料可以均为玻璃， 也可以均为树脂， 或者一个为玻璃一个为树脂， 等等。 在第一透明基板 213和第二透明基板 214之间除第一光传输通道 211和第二 光传输通道 212之外的空间例如还可以填充有保护层， 用于保护上转换发光 材料， 防止上转换发光材料受到损坏。
在本发明的至少一个实施例中，保护层例如可以为真空，或不活泼气体， 如惰性气体（氦、 氖、 氩、 氪、 氙、 氡） 、 氮气等不与上转换发光材料发生 反应的气体。
第一透明基板 213和第二透明基板 214不与可见光发生作用， 因此可见 光可以直接穿过透明基板入射至上转换发光材料， 并且对光触控面板 210的 触控不产生影响。
本发明的至少一个实施例还提供了一种显示装置， 如图 7所示， 包括显 示主体 340和设置在显示主体 340的显示侧的光触控屏 300。 光触控屏 300 包括光触控面板 310、 至少一个第一传感器 320和至少一个第二传感器 330。 光触控面板 310安装在显示主体 340中， 所述至少一个第一传感器 320和所 述至少一个第二传感器 330例如内嵌在显示主体 340和光触控面板 310之间； 光触控面板 310内设有多条第一光传输通道 311和多条第二光传输通道 312， 第一光传输通道 311和第二光传输通道 312例如相互正交； 所述至少一个第 一传感器 320设置在第一光传输通道 311的一端， 用于接收由第一光传输通 道 311发出的光； 所述至少一个第二传感器 330设置在第二光传输通道 312 的一端， 用于接收由第二光传输通道 312发出的光。
在图 7所示的情形中， 第一光传输通道 211和第二光传输通道 312相互 正交。 第一光传输通道 311和第二光传输通道 312的每一个交点都可以看作 是一个发光位置， 从而在触控面板上相当于形成一个直角坐标系， 在光触控 面板 310上的某一位置被光照射后， 该位置发出的光可以同时沿第一光传输 通道 311和第二光传输通道 312发出， 并分别由第一传感器 320和第二传感 器 330检测光信号， 从而可以确定发光位置的坐标， 这样使得触控面板上的 各位置与测定的坐标形成一个线性关系，因而提高了触控位置的定位精确度。
显示主体 340可以为任何类型的显示装置， 例如液晶显示装置、 有机发 光二极管显示装置、 无机二极管显示装置、 等离子体显示装置、 阴极射线管 装置等。
由于光触控屏 300的具体实现方式已在前文中详细描述， 因此这里不再 对其进行赘述。
在本发明的至少一个实施例中， 第一光传输通道 311和第二光传输通道 312 由上转换发光材料形成。 当用户在远离显示装置的位置通过激光笔向光 触控面板 310发出可见激光时， 光线入射至上转换材料， 上转换材料受激发 转换成可见光或不可见光，并沿 X方向的传输通道和 Y方向的传输通道传播， 第一传感器 320和第二传感器 330检测到光信号后由例如中央处理器计算处 理， 从而得出光触控面板 310的发光位置。
在本发明的至少一个实施例中， 可以釆用一个第一传感器和一个第二传 感器的方式， 例如， 第一传感器和第二传感器釆用具有位置分辨功能的传感 器。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限 于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易 想到的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保 护范围应以所述权利要求的保护范围为准。
本申请要求于 2013年 9月 30日递交的中国专利申请第 201310463669.X 号的优先权， 在此全文引用上述中国专利申请公开的内容以作为本申请的一 部分。

Claims

权利要求书
1、 一种光触控屏， 包括：
光触控面板， 其中， 所述光触控面板包括第一光传输通道和第二光传输 通道， 所述第一光传输通道和所述第二光传输通道相交；
第一传感器和第二传感器， 其中， 所述第一传感器设置在所述第一光传 输通道的至少一端， 用于接收由所述第一光传输通道发出的光， 所述第二传 感器设置在所述第二光传输通道的至少一端， 用于接收由所述第二光传输通 道发出的光。
2、根据权利要求 1所述的光触控屏， 其中， 所述第一光传输通道和所述 第二光传输通道包括上转换发光材料。
3、根据权利要求 2所述的光触控屏， 其中， 所述上转换发光材料当暴露 于可见光时发出可见光或不可见光。
4、 根据权利要求 1-3任一所述的光触控屏， 其中， 所述第一传感器设有 第一光强阔值； 所述第二传感器设有第二光强阔值。
5、 根据权利要求 1-4任一所述的光触控屏， 其中， 所述光触控面板还包 括第一基板， 所述第一基板上设有所述第一光传输通道和所述第二光传输通 道。
6、根据权利要求 5所述的光触控屏， 其中， 所述光触控面板还包括第二 基板， 所述第一光传输通道和所述第二光传输通道设置在所述第一基板和第 二基板之间。
7、根据权利要求 6所述的光触控屏， 其中， 所述第一基板和所述第二基 板之间除所述第一光传输通道和所述第二光传输通道之外的空间填充有保护 层。
8、根据权利要求 7所述的光触控屏， 其中， 所述保护层为真空或不活泼 气体。
9、 根据权利要求 6-8任一所述的光触控屏， 其中， 所述第一基板和 /或 所述第二基板为透明基板。
10、 根据权利要求 6-9任一所述的光触控屏， 其中， 所述第一基板和所 述第二基板的材料包括玻璃或者树脂。
11、 根据权利要求 1-10任一所述的光触控屏， 其中， 所述第一传感器和 或第二传感器为光传感器。
12、根据权利要求 11所述的光触控屏， 其中， 所述光传感器包括光电二 极管或红外传感器。
13、 一种显示装置， 包括权利要求 1-13任一项所述的光触控屏。
PCT/CN2014/082422 2013-09-30 2014-07-17 光触控屏以及显示装置 Ceased WO2015043293A1 (zh)

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