WO2021017464A1 - 基于光栅的红外触控屏系统 - Google Patents

基于光栅的红外触控屏系统 Download PDF

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WO2021017464A1
WO2021017464A1 PCT/CN2020/076900 CN2020076900W WO2021017464A1 WO 2021017464 A1 WO2021017464 A1 WO 2021017464A1 CN 2020076900 W CN2020076900 W CN 2020076900W WO 2021017464 A1 WO2021017464 A1 WO 2021017464A1
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Prior art keywords
grating
light
optical
touch screen
waveguide layer
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English (en)
French (fr)
Inventor
叶志成
傅翼斐
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Shanghai Jiao Tong University
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Shanghai Jiao Tong University
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    • 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
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of two-dimensional [2D] relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03545—Pens or stylus
    • 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
    • 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
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • 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

Definitions

  • the invention relates to an interactive touch technology in the field of information display technology, in particular to an infrared touch screen system based on a grating.
  • touch control has four variable sensing methods: acoustic, optical, electrical, and pressure.
  • acoustic, optical, electrical, and pressure are also developing, and they are widely used in teaching, conferences, games and other scenarios.
  • touch control has four variable sensing methods: acoustic, optical, electrical, and pressure.
  • acoustic, optical, electrical, and pressure are also developing, and they are widely used in teaching, conferences, games and other scenarios.
  • touch control has four variable sensing methods: acoustic, optical, electrical, and pressure.
  • Optical active light source infrared screen.
  • Most of the touch screen systems that can achieve both contact type and non-contact type need to add a camera system to the above-mentioned contact type screen system to perform image recognition of human-computer interaction touch positions.
  • the purpose of the present invention is to provide a grating-based infrared touch screen system in view of the above-mentioned shortcomings of the prior art.
  • the infrared touch screen system integrates contact and non-contact touch while also saving costs and improving The advantage of user experience.
  • a grating-based infrared touch screen system which is characterized by including an optical stylus, a display information layer, a spectral filter optical film, a grating, an optical waveguide layer, and a light receiver.
  • the display information layer and the spectral filter optical The film, the grating, and the optical waveguide layer constitute the touch screen.
  • the optical stylus simultaneously emits visible light and invisible light of a specific wavelength to the touch screen.
  • the invisible light of the specific wavelength can be
  • the grating diffracts into the invisible light of the waveguide mode that can be transmitted in the optical waveguide layer, and is transmitted to the light receiver as the touch detection light, which is converted into the current signal of the display position.
  • the optical stylus simultaneously emits visible light and invisible light of a specific wavelength, the visible light is used to mark the touch position, and the invisible light of the specific wavelength is used as the touch detection light.
  • the display information layer is a projected reflective screen or a non-projected display layer.
  • the spectral filter optical film has the functions of reflecting the visible light and transmitting the invisible light respectively.
  • the spectral filter optical film is placed on a side of the display information layer away from the user, and is attached or not attached to the display information layer.
  • the material of the optical waveguide layer is a single layer material or a multilayer material that is transparent to invisible light, and the refractive index of the material of the optical waveguide layer is single or graded.
  • the optical waveguide layer is placed on the side of the spectral filter optical film away from the user and is attached or not attached to the spectral filter optical film; if attached, the refractive index of the material of the optical waveguide layer is not less than The refractive index of the spectral filter optical film.
  • the size of the period of the grating covering the optical waveguide layer satisfies that at least one invisible light emitted by the optical stylus becomes the waveguide detection light.
  • the grating is covered on any side of the optical waveguide layer or placed in the optical waveguide layer.
  • the wavelength range of the visible light wavelength is 380 nm to 780 nm, and the wavelength range of the invisible light wavelength of the specific wavelength is above 780 nm.
  • the optical receiver is a sensor array capable of detecting the wavelength of the invisible light and is placed on the periphery of the optical waveguide layer.
  • the spectral filtering optical film has the functions of reflecting visible light and transmitting invisible light, and can reduce the diffraction of the large-period grating without affecting the display information layer and the touch detection light.
  • the invention utilizes the coupling characteristic of the grating to couple the invisible light of a specific wavelength emitted by the optical stylus to the optical waveguide layer to form the detection light, and the light receiver determines the change in the intensity of the detection light.
  • the present invention uses an optical stylus to emit visible light and invisible light.
  • the visible light is used to mark the touch position.
  • the invisible light of a specific wavelength is diffracted by the grating on the touch screen into a waveguide mode that can be transmitted in the waveguide, and is transmitted to the
  • the light receiver is used as the touch detection light; contact and non-contact touch can be realized without additional camera recognition system, saving costs; the use of the spectral filter optical film does not affect the display effect, but reduces The influence of the diffracted light of the large-period grating on the user.
  • Figure 1 shows the theoretical value diagram of the coupling grating period for infrared wavelengths above 800 nm.
  • Figure 2 is a graph of the simulated value of the coupled grating period corresponding to infrared wavelengths above 800 nm.
  • Figure 3 is a schematic diagram of the coupling efficiency of optical stylus with a wavelength of 532nm visible light and a wavelength of 808nm invisible light at a grating period of 650nm
  • Embodiment 4 is a schematic structural diagram of Embodiment 1 of the infrared touch screen system based on a grating of the present invention.
  • Embodiment 1 is a schematic cross-sectional structure diagram of Embodiment 1 of the infrared touch screen system based on a grating of the present invention.
  • FIG. 6 is a three-dimensional schematic diagram of the embodiment 1 of the infrared touch screen system based on the grating in the projection system as a reflective screen.
  • FIG. 7 is a schematic diagram of the structure of Embodiment 2 of the infrared touch screen system based on the grating in the non-projection mode of the present invention.
  • the +m-level and -m-level coupling formulas of the grating waveguide are shown in formula (1).
  • k 0 is the wave number in vacuum
  • n 0 is the refractive index of the incident medium
  • ⁇ is the angle of incidence in the waveguide
  • T is the grating period
  • n 1 is the waveguide refractive index
  • n eff is the effective refractive index of the waveguide.
  • the +m-order diffracted light takes a positive sign
  • the -m-order diffracted light takes a negative sign.
  • m 0, ⁇ 1, ⁇ 2..., n 1 >n 0 ,
  • the m-order diffracted light should meet the following conditions:
  • ⁇ is the wavelength of invisible light incident in vacuum.
  • the grating period T slightly smaller than the theoretical value can also meet the requirements.
  • the wavelength range that the human eye can perceive is 380nm to 780nm, and the wavelength range of infrared is 760nm to 1mm.
  • we can set the appropriate grating period As shown in Figure 1, Figure 2), consider the ⁇ 1st order diffracted light, make the infrared invisible light of 780nm and above become the waveguide mode, and set the visible light from 380nm to 780nm that cannot be coupled into the corresponding grating period to mark the touch position.
  • the present invention is based on the projection display system, through the combined use of the optical waveguide layer covering the grating and the spectral filter optical film, while using infrared light as the detection light, it also reduces the user experience of the diffracted light of the large period grating Impact.
  • FIG. 4 is a schematic structural diagram of Embodiment 1 of the infrared touch screen system based on a grating of the present invention.
  • 5 is a schematic diagram of the cross-sectional structure of the projection system in Embodiment 1 of the grating-based infrared touch screen system of the present invention.
  • the grating-based infrared touch screen system of the present invention includes an optical stylus 201, a display information layer 202, a spectral filter optical film 203, a grating 204, an optical waveguide layer 205 and a light receiver 206, which are composed of The display information layer 202, the spectral filter optical film 203, the grating 204, and the optical waveguide layer 205 constitute a touch screen.
  • the light receiver 206 is placed on the periphery of the optical waveguide layer 205, and the optical stylus 201 simultaneously emits visible light and invisible light of a specific wavelength to the touch screen.
  • the invisible light of the specific wavelength can be diffracted by the grating 204 on the optical waveguide layer 205 into the light
  • the invisible light of the waveguide mode transmitted in the waveguide layer 205 is transmitted to the light receiver 206 as the touch detection light, and converted into a current signal of the display position.
  • the optical stylus 201 is used by touch screen users.
  • the shape and material of the optical stylus 201 are not limited.
  • the light source of the optical stylus 201 is composed of visible light and invisible light.
  • the display information layer 202 may be a projected reflective screen or a non-projected display layer.
  • the spectral filter optical film 203 is not limited in material, and only needs to satisfy the function of reflecting visible light while transmitting infrared invisible light.
  • the optical waveguide layer 205 is placed on the side of the spectral filter optical film 203 away from the touch user.
  • the optical waveguide layer 205 has a grating 204 on the side away from the user.
  • Optical receivers 206 are provided around the optical waveguide layer 205.
  • the grating 204 faces the spectral filter optical film 203, it is made of a transparent material; if the grating surface of the optical waveguide layer 205 faces away from the optical film, an infrared reflective film can be coated to enhance the coupling efficiency of infrared light.
  • the optical stylus 201 When working, the optical stylus 201 emits visible light and invisible light at the same time. First, the visible light is reflected by the spectral filter film 203 to mark the position of the user's interactive touch point, while the invisible light transmits through the spectral filter optical film 203 and passes through When grating 204, infrared light of a certain wavelength enters the optical waveguide layer 205 and is transmitted laterally in the optical waveguide layer to become a waveguide mode.
  • the optical receiver 206 detects the infrared light transmitted laterally in the optical waveguide 205 and constitutes an important part of touch detection.
  • contact or remote non-contact can form a touch interaction with the infrared touch screen, and the positioning of the operating object is realized by the light intensity change detected by the light receiver 206.
  • the period of the coupling grating is larger, which results in stronger diffraction light of the grating. If there is no visible light filtering by the spectral filter film 203 in front of the grating, it will be impossible to view due to diffraction.
  • the spectral filter optical film 203 has the function of reflecting visible light and transmitting invisible light, which can reduce the diffraction of the large-period grating without affecting the display light.
  • FIG. 6 is a three-dimensional schematic diagram of Embodiment 1 of the grating-based infrared touch screen of the present invention as a reflective screen in a projection system.
  • the optical stylus 201 is included for use by touch screen users.
  • the shape and material of the optical stylus are not limited, and the light source is mainly composed of visible light and invisible light.
  • the display information layer 202 is now a projected reflective screen for displaying projection information.
  • the spectral filter optical film 203 satisfies the function of reflecting visible light and transmitting infrared invisible light.
  • the optical waveguide layer 205 is placed on the side of the spectral filter optical film 203 away from the touch user.
  • the optical waveguide layer 205 has a grating 204 on one surface.
  • Optical receivers 206 are provided around the optical waveguide layer 205. If the grating 204 faces the spectral filter optical film 203.
  • the optical stylus 201 When working, the optical stylus 201 emits visible light and invisible light at the same time. First, the visible light is reflected by the spectral filter film 203 to mark the position of the interactive touch point for the user and the audience, while the invisible light transmits through the spectral filter optical film 203.
  • infrared light of a certain wavelength enters the optical waveguide layer 205 and is transmitted laterally in the optical waveguide layer to become a waveguide mode.
  • the optical receiver 206 detects the infrared light transmitted laterally in the optical waveguide 205 and constitutes an important part of touch detection.
  • contact or remote non-contact can form a touch interaction with the infrared touch screen, and the positioning of the operating object is realized by the light intensity change detected by the light receiver 206.
  • FIG. 7 is a schematic structural diagram of Example 2 of an infrared touch screen based on a grating of the present invention, which is used in a non-projection display system.
  • the display information layer 202 is a liquid crystal panel or an organic light-emitting layer at this time.
  • the film 203 is attached to the side of the display information layer 202 away from the user.
  • the optical stylus 201 is used by touch screen users.
  • the shape and material of the optical stylus are not limited, and the light source is mainly composed of visible light and invisible light.
  • the spectral filter optical film 203 satisfies the function of reflecting visible light and transmitting infrared invisible light.
  • the optical waveguide layer 205 is placed on the side of the spectral filter optical film 203 away from the touch user.
  • the optical waveguide layer 205 has a grating 204 on the side away from the user. Each group of adjacent sides of the transparent optical waveguide layer 205 is provided with a light receiver 206. If the grating 204 faces the spectral filter optical film 203, it is made of a transparent material.
  • the advantage of using the spectral filtering optical film 203 is that, without affecting the touch interaction, the influence of the large-period grating diffracted light on the display effect is greatly reduced, and the viewing experience of the user is improved.
  • the present invention utilizes the diffraction of the grating, the invisible light of a specific wavelength in the optical stylus becomes the detection light of the touch point, and the visible light serves as the mark position, so that the touch interaction does not affect the effect of the display system.
  • the spectral filter film has the function of reflecting visible light and transmitting invisible light, which greatly reduces the diffracted light of the grating and brings a good user experience.

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  • General Engineering & Computer Science (AREA)
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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

一种基于光栅的红外触控屏系统，包括光学式触控笔、显示信息层、光谱过滤光学膜、光栅，波导层和光接收器。所述的光学式触控笔同时发射出可见光和不可见光到触控屏上，可见光用于标识触控位置，特定波长的不可见光通过波导层上的光栅衍射成为可在波导内传输的波导模，传至光接收器作为触控的检测光。所述的光谱过滤光学膜具有反射可见光，透射不可见光的作用，可在减少大周期光栅衍射的同时不影响显示光。本发明无需额外提供摄像头，节约成本。检测光是不可见光，提高了人机交互的用户体验。

Description

基于光栅的红外触控屏系统 技术领域
本发明涉及信息显示技术领域的交互式触控技术，特别是一种基于光栅的红外触控屏系统。
背景技术
随着各种终端的普及，人机交互方式也随之兴起，而显示屏幕作为终端和人第一接触媒介，屏幕交互触控的方式也在发展，广泛应用在教学、会议、游戏等场景，触控根据技术原理的不同有声学式、光学式、电学式、压力式四种变量感知方式。在这四种技术里面，大多都只能进行接触式触控，不能进行远程非接触式触控，比如电学式的电阻屏和电容屏、压力式的压力传感屏、声学式的表面声波屏、光学式的主动光源式红外屏。既能做到接触式，又能进行非接触式的触控屏系统大多都需要在上述接触式屏幕系统外增加摄像头系统，进行人机交互触控位置的图像识别。
摄像头式的人机交互，虽然满足了非接触式触控，但还是有缺陷，第一，人的活动范围被局限在摄像头的识别范围，而且身体姿势有要求，不能随意遮挡识别目标；第二，多用户使用时增加了识别的难度，更加限制了活动范围，这也给人机交互带来了不便；第三，增加摄像头和实时图像处理系统的成本较高。
目前有一种基于光栅结构与补偿光源的光波导式光学触控屏(专利申请号：201510220923.2)，其中虽然有提到红外光作检测光，但其红外光是作为主动式光源使用，用于接触式破坏，未涉及远距离非接触式的触控交互，同时存在的问题是，红外波段的光作为检测光时，耦合光栅的周期较大，这导致光栅衍射较强，若光栅之前没有可见光过滤，会因为衍射造成无法观看。
发明内容
本发明的目的在于针对上述现有技术的不足，提供一种基于光栅的红外触控 屏系统，该红外触控屏系统在集合接触式和非接触式触控的同时，还具有节约成本，提升了用户体验的优势。
本发明的技术解决方案如下：
一种基于光栅的红外触控屏系统，其特点在于包括光学式触控笔、显示信息层、光谱过滤光学膜、光栅、光波导层和光接收器，由所述的显示信息层、光谱过滤光学膜、光栅、光波导层构成触控屏，所述的光学式触控笔同时发射出特定波长的可见光和不可见光到所述的触控屏上，所述的特定波长的不可见光是能被所述的光栅衍射成为可在所述的光波导层内传输的波导模的不可见光，传至光接收器作为触控的检测光，转化为显示位置的电流信号。
所述的光学式触控笔同时发出可见光和特定波长的不可见光，可见光用于标识触控位置，特定波长的不可见光作为触控的检测光。
所述的显示信息层为投影的反射幕布或者非投影的显示层。
所述的光谱过滤光学膜具有分别反射所述的可见光和透射所述的不可见光的作用。
所述的光谱过滤光学膜置于显示信息层远离用户的一侧面，与所述的显示信息层贴合或不贴合。
所述的光波导层的材料是对不可见光透明的单层材料或多层材料，所述的光波导层的材料的折射率是单一的或渐变的。
所述的光波导层置于光谱过滤光学膜远离用户的一侧面与所述的光谱过滤光学膜贴合或不贴合；若贴合，则所述的光波导层的材料的折射率不小于所述的光谱过滤光学膜折射率。
覆盖在光波导层上的光栅的周期的大小满足使所述的光学式触控笔发出的至少一种不可见光成为波导检测光。
所述的光栅覆盖在所述的光波导层的任意一面或置于所述的光波导层中。
所述的可见光波长的波长范围为380nm到780nm，所述的特定波长的不可见光波长的波长范围为780nm以上。
所述的光接收器是能检测到所述的不可见光波长的传感器阵列并置于所述的光波导层的周边。
所述的光谱过滤光学膜具有反射可见光和透射不可见光的作用，可在减少大 周期光栅衍射的同时不影响显示信息层和触控检测光。本发明利用光栅的耦合特性，将光学式触控笔发射出的特定波长的不可见光，耦合到光波导层构成检测光，并由光接收器判断检测光的光强的变化。
与现有技术相比，本发明的有益效果如下：
本发明通过使用光学式触控笔发出可见光和不可见光，可见光用于标识触控位置，特定波长的不可见光通过触控屏上的光栅衍射成为可在波导内传输的波导模，传至所述的光接收器作为触控的检测光；无需额外提供摄像头识别系统即可实现接触式和非接触式触控，节约成本；所述的光谱过滤光学膜的使用，不影响显示效果，但减小了大周期光栅的衍射光对用户的影响。
附图说明
图1为800nm以上红外波长对应耦合光栅周期的理论值图。
图2为800nm以上红外波长对应耦合光栅周期的仿真值图。
图3为光学式触控笔的波长532nm可见光和波长808nm不可见光在光栅周期为650nm上的耦合效率示意图
图4为本发明基于光栅的红外触控屏系统实施例1的结构示意图。
图5为本发明基于光栅的红外触控屏系统实施例1的截面结构示意图。
图6为本发明基于光栅的红外触控屏系统实施例1在投影系统中作为反射幕布的立体示意图。
图7为本发明基于光栅的红外触控屏系统实施例2在非投影中的结构示意图。
具体实施方式
下面结合实施例和附图对本发明作详细说明，但不应以此限制本发明的保护范围。
光栅波导的+m级、‐m级的耦合公式如公式(1)所示。其中，k 0是真空中的波数，n 0是入射介质的折射率，θ为波导内的入射角，T为光栅周期，n 1为波导折射率，n eff为波导有效折射率。公式(1)中绝对值部分，对于+m级衍射光取正号，‐m级衍射光取负号。并且有m＝0,±1,±2…，n 1>n 0，
Figure PCTCN2020076900-appb-000001
Figure PCTCN2020076900-appb-000002
根据公式(1)化简可得，要使+m级衍射光成为波导中的波导模式，应满足以下条件：
Figure PCTCN2020076900-appb-000003
同理可得‐m级衍射光应满足以下条件：
Figure PCTCN2020076900-appb-000004
其中，λ为真空中入射的不可见光的波长。
当入射角θ和光栅周期T确定时，显然入射光中只有不可见光波长满足上述公式(2)、公式(3)的，在衍射级里至少有同一阶(±m,0)、(0,±m)、(+m,-m)的级数满足耦合条件，其它级数的光将穿过光栅波导发射出来。
实际上，光栅周期T略小于理论值也是可以满足要求的。人眼可以感受到的波长范围为380nm到780nm，红外线的波长范围为760nm到1mm，根据以上的理论，对于光学式触控笔发射出的可见光和不可见光，我们可以通过设置恰当的光栅周期(如图1，图2所示)，考虑±1级衍射光，使得780nm及以上的红外不可见光成为波导模，再设置380nm到780nm中无法耦合进对应光栅周期的可见光用于标识触控位置。这样，在不影响触控屏显示的同时，我们利用不可见光波长的光作为检测光，也提高了用户体验。例如，在近似垂直入射下,即θ∈(0°,1°)，入射介质为空气n 0＝1，波导介质为塑料n 1＝1.59，λ 1＝530nm，λ 2＝808nm，光栅周期T＝650nm时，仿真结果如图3所示。可见530nm几乎没有光耦合在波导中，而808nm有10％的光耦合在波导中。
本发明是在投影显示系统的基础上，通过覆盖光栅的光波导层和光谱过滤光学膜的结合使用，在使用红外光作为检测光的同时，也减小了大周期光栅的衍射光对用户体验的影响。
实施例1
请参阅图4，图5。图4为本发明基于光栅的红外触控屏系统实施例1的结构示意图。图5为本发明基于光栅的红外触控屏系统实施例1投影系统中的截面结构示意图。由图可见，本发明基于光栅的红外触控屏系统，包括光学式触控笔201、显示信息层202、光谱过滤光学膜203、光栅204、光波导层205和光接收 器206，由所述的显示信息层202、光谱过滤光学膜203、光栅204、光波导层205构成触控屏，所述的光接收器206置于所述的光波导层205的周边，所述的光学式触控笔201同时发射出特定波长的可见光和不可见光到所述的触控屏上，所述的特定波长的不可见光是能备所述的光波导层205上的光栅204衍射成为可在所述的光波导层205内传输的波导模的不可见光，传至所述的光接收器206作为触控的检测光，转化为显示位置的电流信号。
所述的光学式触控笔201，给触控屏使用者使用，光学式触控笔201的形状和材料不限，光学式触控笔201的光源由可见光和不可见光组成。显示信息层202可以为投影的反射幕布或者非投影的显示层。光谱过滤光学膜203，材料不限，满足反射可见光同时透射红外不可见光的作用即可。光谱过滤光学膜203远离触控使用者的一面放置光波导层205。光波导层205远离使用者的一面上具有光栅204。光波导层205四周均设置有光接收器206。光栅204若面朝向光谱过滤光学膜203，则由透明材料制成；若光波导层205的光栅面背向光学膜，则可镀红外反射膜，增强红外光的耦合效率。
工作时，光学式触控笔201同时发出可见光和不可见光，首先可见光被光谱过滤膜203反射，用于标识给用户交互触控点的位置，而不可见光透射过光谱过滤光学膜203，在通过光栅204时，一定波长的红外光进入光波导层205，并在光波导层中横向传输，成为波导模。光接收器206检测在光波导205中横向传输的红外光，构成触控检测的重要部分。当光学触控笔201在发射出红外不可见光的状态下，接触或远程非接触都可与红外触控屏构成触控交互，通过光接收器206检测的光强变化实现操作物的定位。
特别强调的是：当红外波段的光作为检测光时，耦合光栅的周期较大，这导致光栅衍射光较强，若光栅前面没有光谱过滤膜203的可见光过滤，会因为衍射造成无法观看，而光谱过滤光学膜203具有反射可见光，透射不可见光的作用，可在减少大周期光栅衍射的同时不影响显示光。
图6是本发明基于光栅的红外触控屏的实施例1在投影系统中作为反射幕布的立体示意图。包括光学式触控笔201，给触控屏使用者使用，光学式触控笔的形状和材料不限，主要是光源由可见光和不可见光组成。显示信息层202此时为投影的反射幕布，用来显示投影信息。光谱过滤光学膜203，满足反射可见光， 透射红外不可见光的作用。光谱过滤光学膜203远离触控使用者的一面放置光波导层205。光波导层205一面上具有光栅204。光波导层205的四周均设置有光接收器206。光栅204若面朝向光谱过滤光学膜203。
工作时，光学式触控笔201同时发出可见光和不可见光，首先可见光被光谱过滤膜203反射，用于标识给用户和观众交互触控点的位置，而不可见光透射过光谱过滤光学膜203，在通过光栅204时，一定波长的红外光进入光波导层205，并在光波导层中横向传输，成为波导模。光接收器206检测在光波导205中横向传输的红外光，构成触控检测的重要部分。当光学触控笔201在发射出红外不可见光的状态下，接触或远程非接触都可与红外触控屏构成触控交互，通过光接收器206检测的光强变化实现操作物的定位。
实施例2
图7是本发明基于光栅的红外触控屏的实例2的结构示意图，用于非投影的显示系统中，所述的显示信息层202此时为液晶面板或者有机发光层，此时光谱过滤光学膜203贴合在显示信息层202远离用户的一侧。光学式触控笔201，给触控屏使用者使用，光学式触控笔形状和材料不限，主要是光源由可见光和不可见光组成。光谱过滤光学膜203，满足反射可见光，透射红外不可见光的作用。光谱过滤光学膜203远离触控使用者的一面放置光波导层205。光波导层205远离使用者的一面上具有光栅204。透明光波导层205每组邻边均设置有光接收器206。光栅204若面朝向光谱过滤光学膜203，则由透明材料制成。
采用光谱过滤光学膜203的好处是，在不影响触控交互的情况下，大大减少了大周期的光栅衍射光对显示效果的影响，提高了用户的观看体验。
实验表明，本发明利用光栅的衍射，光学式触控笔中特定波长的不可见光成为触控点的检测光，可见光为标识位置的作用，使触控交互不影响显示系统的效果。并且光谱过滤膜具有反射可见光，透射不可见光的作用，大大减少了光栅的衍射光，带来了良好的用户体验。

Claims (10)

  1. 一种基于光栅的红外触控屏系统，其特征在于包括光学式触控笔(201)、显示信息层(202)、光谱过滤光学膜(203)、光栅(204)、光波导层(205)和光接收器(206)，由所述的显示信息层(202)、光谱过滤光学膜(203)、光栅(204)、光波导层(205构成触控屏，所述的光接收器(206)置于所述的光波导层(205)的周边，所述的光学式触控笔(201)同时发射出可见光和特定波长的不可见光到所述的触控屏上，所述的特定波长的不可见光是能被所述的光栅(204)衍射成为可在所述的光波导层(205)内传输的波导模的不可见光，传至所述的光接收器(206)作为触控的检测光，转化为显示位置的电流信号。
  2. 如权利要求1所述的基于光栅的红外触控屏系统，其特征在于所述的光学式触控笔(201)同时发出可见光和特定波长的不可见光，可见光用于标识触控位置，特定波长的不可见光作为触控的检测光。
  3. 如权利要求1所述的基于光栅的红外触控屏系统，其特征在于所述的显示信息层(202)为投影的反射幕布或者非投影的显示层。
  4. 如权利要求1所述的基于光栅的红外触控屏系统，其特征在于所述的光谱过滤光学膜(203)具有分别反射所述的可见光和透射所述的不可见光的作用。
  5. 如权利要求1所述的基于光栅的红外触控屏系统，其特征在于所述的光谱过滤光学膜(203)置于显示信息层(202)远离用户的一侧，与所述的显示信息层(202)贴合或不贴合。
  6. 如权利要求1所述的基于光栅的红外触控屏系统，其特征在于所述的光波导层(205)的材料是对不可见光透明的单层材料或多层材料，所述的光波导层(205)的材料的折射率是单一的或渐变的。
  7. 如权利要求1所述的基于光栅的红外触控屏系统，其特征在于所述的光波导层(205)置于光谱过滤光学膜(203)远离用户的一侧与所述的光谱过滤光学膜(203)贴合或不贴合；若贴合，则所述的光波导层(205)的材料的折射率不小于所述的光谱过滤光学膜(203)折射率。
  8. 如权利要求1所述的基于光栅的红外触控屏系统，其特征在于覆盖在光波导层(205)上的光栅(204)周期的大小满足使所述的光学式触控笔(201) 发出的至少一种不可见光成为波导检测光。
  9. 如权利要求1所述的基于光栅的红外触控屏系统，其特征在于所述的光栅(204)覆盖在所述的光波导层(205)的任意一面或置于所述的光波导层(205)中。
  10. 如权利要求1至9任一项所述的基于光栅的红外触控屏系统，其特征在于所述的可见光波长的波长范围为380nm到780nm，所述的特定波长的不可见光波长的波长范围为780nm以上。
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