CN110502145A - Infrared touch-control screen system based on grating - Google Patents

Infrared touch-control screen system based on grating Download PDF

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Publication number
CN110502145A
CN110502145A CN201910698630.3A CN201910698630A CN110502145A CN 110502145 A CN110502145 A CN 110502145A CN 201910698630 A CN201910698630 A CN 201910698630A CN 110502145 A CN110502145 A CN 110502145A
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China
Prior art keywords
light
grating
touch
layer
optical
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Pending
Application number
CN201910698630.3A
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Chinese (zh)
Inventor
叶志成
傅翼斐
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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Filing date
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Application filed by Shanghai Jiaotong University filed Critical Shanghai Jiaotong University
Priority to CN201910698630.3A priority Critical patent/CN110502145A/en
Publication of CN110502145A publication Critical patent/CN110502145A/en
Priority to PCT/CN2020/076900 priority patent/WO2021017464A1/en
Pending legal-status Critical Current

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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
    • G06F3/033—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 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; 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
    • G06F3/033—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; 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
    • 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; 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

Abstract

A kind of infrared touch-control screen system based on grating, including optical touch control pen, display Information Level, spectral filtering optical film, grating, ducting layer and optical receiver.The optical touch control pen is launched on visible light and black light to touch screen simultaneously, visible light is for identifying position of touch, the black light of specific wavelength becomes the wave guide mode that can be transmitted in waveguide by the optical grating diffraction on ducting layer, reaches detection light of the optical receiver as touch-control.The spectral filtering optical film has reflection visible light, transmits the effect of black light, can not influence to show light while reducing large period optical grating diffraction.The present invention is without being additionally provided camera, save the cost.Detection light is black light, improves the user experience of human-computer interaction.

Description

Infrared touch-control screen system based on grating
Technical field
The present invention relates to the interactive touch-control technology of technical field of information display, especially a kind of infrared touching based on grating Control screen system.
Background technique
With popularizing for various terminals, man-machine interaction mode is also risen therewith, and shows screen as terminal and people first The mode of contact medium, screen interaction touch-control is also developing, and is widely used in the scenes such as teaching, meeting, game, touch-control is according to skill The difference of art principle has four kinds of acoustics formula, optical profile type, electricity formula, pressure type variable perceptive modes.Inside these four technologies, greatly Contact touch-control can only be all mostly carried out, not can be carried out Remote Non-touch touch-control, such as the touch screens and capacitance plate of electricity formula, pressure The pressure sensing screen of power formula, the surface acoustic wave screen of acoustics formula, optical profile type active light source formula infrared screen.It can accomplish contact, It can be carried out contactless touch-control screen system again to require to increase camera system outside above-mentioned touch screen system mostly, into The image recognition of row human-computer interaction position of touch.
The human-computer interaction of camera head type, although meeting non-contact type touch control, but it is defective, first, the activity of people Range is limited in the identification range of camera, and body gesture requires, and cannot arbitrarily block identification target；Second, it is more User using when increase the difficulty of identification, more limit scope of activities, this also brings inconvenience to human-computer interaction；Third, Increase the higher cost of camera and real time image processing system.
Have at present it is a kind of based on optical grating construction and compensatory light light wave conduction optical touch screen (number of patent application: 201510220923.2), although its infrared light is used as active light source wherein mentioning infrared light makees detection light, The problem of destroying for contact, being not directed to remote contactless touch-control interaction, exist simultaneously is that the light of infrared band is made When for detection light, the period of coupling grating is larger, this causes optical grating diffraction stronger, if not having visible light filtering, meeting before grating Because diffraction causes not watching.
Summary of the invention
It is an object of the invention in view of the above shortcomings of the prior art, provide a kind of infrared touch screen system based on grating System, the infrared touch-control screen system also have save the cost, improve user while gathering contact and non-contact type touch control The advantage of experience.
Technical solution of the invention is as follows:
A kind of infrared touch-control screen system based on grating, it is characterized in that including optical touch control pen, display Information Level, light Compose filtering optical film, grating, light waveguide-layer and optical receiver, by the display Information Level, spectral filtering optical film, grating, Light waveguide-layer constitutes touch screen, and the visible light and black light that the optical touch control pen launches specific wavelength simultaneously are to institute On the touch screen stated, the black light of the specific wavelength be can by the optical grating diffraction become can be in the optical waveguide The black light of the wave guide mode transmitted in layer, reaches detection light of the optical receiver as touch-control, is converted into the electric current of display position Signal.
The optical touch control pen is simultaneously emitted by the black light of visible light and specific wavelength, it is seen that light is for identifying touching Control position, detection light of the black light of specific wavelength as touch-control.
The display Information Level is the reflection curtain of projection or the display layer of non-projection.
The spectral filtering optical film has the work for reflecting the visible light and the transmission black light respectively With.
The spectral filtering optical film is placed in display one side of the Information Level far from user, with the display Information Level Fitting or not.
The material of the light waveguide-layer is the monolayer material or multilayer material transparent to black light, the optical waveguide The refractive index of the material of layer is single or gradual change.
The light waveguide-layer is placed in one side of the spectral filtering optical film far from user and the spectral filtering optics Film is bonded or is not bonded；If fitted, then the refractive index of the material of the light waveguide-layer is not less than the spectral filtering optics Film refractive index.
The size in the period for the grating being covered on light waveguide-layer, which meets, issues the optical touch control pen at least A kind of black light becomes waveguide detection light.
The grating is covered on any one side of the light waveguide-layer or is placed in the light waveguide-layer.
The wave-length coverage of the visible wavelength is 380nm to 780nm, the black light wavelength of the specific wavelength Wave-length coverage be 780nm or more.
The optical receiver is to detect that the sensor array of the black light wavelength is placed in the light The periphery of ducting layer.
The spectral filtering optical film has the function of reflecting visible light and transmits black light, can reduce large period It does not influence to show Information Level and touch control detection light while optical grating diffraction.The present invention utilizes the coupled characteristic of grating, by optical profile type The black light for the specific wavelength that stylus is launched is coupled to light waveguide-layer and constitutes detection light, and judges to examine by optical receiver Survey the variation of the light intensity of light.
Compared with prior art, beneficial effects of the present invention are as follows:
By the present invention in that issuing visible light and black light with optical profile type stylus, it is seen that light is for identifying touch-control position It sets, the black light of specific wavelength becomes the wave guide mode that can be transmitted in waveguide by the optical grating diffraction on touch screen, reaches institute Detection light of the optical receiver stated as touch-control；Contact and non-contact can be realized without being additionally provided camera identifying system Formula touch-control, save the cost；The use of the spectral filtering optical film, does not influence display effect, but reduces large period grating Influence of the diffraction light to user.
Detailed description of the invention
Fig. 1 is the theoretical value figure that 800nm or more infrared wavelength corresponds to the coupling grating period.
Fig. 2 is the simulation value figure that 800nm or more infrared wavelength corresponds to the coupling grating period.
Fig. 3 is the wavelength 532nm visible light of optical touch control pen and wavelength 808nm black light in screen periods is Coupling efficiency schematic diagram on 650nm
Fig. 4 is that the present invention is based on the structural schematic diagrams of the infrared touch screen system embodiment 1 of grating.
Fig. 5 is that the present invention is based on the cross section structure schematic diagrams of the infrared touch screen system embodiment 1 of grating.
Fig. 6 is that the present invention is based on the infrared touch screen system embodiments 1 of grating in projection systems as reflection curtain Stereoscopic schematic diagram.
Fig. 7 is the structural schematic diagram the present invention is based on the infrared touch screen system embodiment 2 of grating in non-projection.
Specific embodiment
It elaborates below with reference to embodiment and attached drawing to the present invention, but protection model of the invention should not be limited with this It encloses.
Shown in+m the grade of grating waveguide ,-m grades of coupling formula such as formula (1).Wherein, k0It is the wave number in vacuum, n0It is The refractive index of incident medium, θ are the incidence angle in waveguide, and T is screen periods, n1For waveguide index, neffIt is effectively rolled over for waveguide Penetrate rate.Absorption part in formula (1) takes positive sign for+m grades of diffraction lights, and-m grades of diffraction lights take negative sign.And there is m=0, ± 1, ± 2 ..., n1>n0,
It can be obtained according to formula (1) abbreviation, so that+m grades of diffraction lights is become the waveguide mode in waveguide, following item should be met Part:
- m grades of diffraction lights, which can similarly be obtained, to meet the following conditions:
Wherein, λ is the wavelength of black light incident in vacuum.
When incidence angle θ and screen periods T are determined, it is clear that only have black light wavelength to meet above-mentioned formula in incident light (2), formula (3), in the order of diffraction at least same single order (± m, 0), (0, ± m), (+m ,-m) series meet coupling item Part, the light of other series pass through grating waveguide and emit.
In fact, it is also that can satisfy requirement that screen periods T, which is slightly less than theoretical value,.The wavelength model that human eye can be experienced It encloses for 380nm to 780nm, the wave-length coverage of infrared ray is 760nm to 1mm, according to above theory, for optical touch control pen The visible light and black light launched, the screen periods (as shown in Fig.1 and Fig.2) that we can be appropriate by setting, consider ± 1 grade of diffraction light, so that the infrared black light of 780nm or more becomes wave guide mode, then being arranged in 380nm to 780nm can not coupling The visible light into corresponding screen periods is closed for identifying position of touch.In this way, while not influencing touch screen display, Wo Menli It uses the light of black light wavelength as detection light, also improves user experience.For example, in the case where near normal is incident, i.e. θ ∈ (0°, 1°), incident medium is air n0=1, waveguide medium is plastics n1=1.59, λ1=530nm, λ2=808nm, screen periods T= When 650nm, simulation result is as shown in Figure 3.It can be seen that 530nm almost without optical coupling in the waveguide, and 808nm has 10% optocoupler It closes in the waveguide.
The present invention is on the basis of projection display system, by the light waveguide-layer and spectral filtering optical film that cover grating Combined use also reduce large period grating diffration light to user experience while using infrared light as detection light Influence.
Embodiment 1
Referring to Fig. 4, Fig. 5.Fig. 4 is that the present invention is based on the structural schematic diagrams of the infrared touch screen system embodiment 1 of grating. Fig. 5 is that the present invention is based on the cross section structure schematic diagrams in infrared 1 optical projection system of touch screen system embodiment of grating.It can by figure See, the present invention is based on the infrared touch-control screen systems of grating, including optical touch control pen 201, display Information Level 202, spectral filtering Optical film 203, grating 204, light waveguide-layer 205 and optical receiver 206, by the display Information Level 202, spectral filtering optics Film 203, grating 204, light waveguide-layer 205 constitute touch screen, and the optical receiver 206 is placed in the light waveguide-layer 205 Periphery, the visible light and black light that the optical touch control pen 201 launches specific wavelength simultaneously are to the touch screen On, the black light of the specific wavelength be can 204 diffraction of grating on the standby light waveguide-layer 205 become can be described Light waveguide-layer 205 in the black light of wave guide mode that transmits, reach detection light of the optical receiver 206 as touch-control, It is converted into the current signal of display position.
The optical touch control pen 201 uses, the shape and material of optical touch control pen 201 to touch screen user Unlimited, the light source of optical touch control pen 201 is made of visible light and black light.Show that Information Level 202 can be the anti-of projection Penetrate the display layer of curtain or non-projection.Spectral filtering optical film 203, material is unlimited, meets reflection visible light while transmiting red The effect of outer black light.Spectral filtering optical film 203 places light waveguide-layer 205 far from the one side of touch-control user.Light Ducting layer 205 far from the one side of user have grating 204.205 surrounding of light waveguide-layer is provided with optical receiver 206.Light If grid 204 are made of clear material facing towards spectral filtering optical film 203；If the grating face of light waveguide-layer 205 is backwards to optics Film can then plate infrared reflection film, enhance the coupling efficiency of infrared light.
When work, optical touch control pen 201 is simultaneously emitted by visible light and black light, and visible light is by spectral filtering film first 203 reflections cross spectral filtering optical film 203 without visible transmission, logical for identifying to the position of user's interaction touch point When crossing grating 204, the infrared light of certain wavelength enters light waveguide-layer 205, and the lateral transport in light waveguide-layer, becomes waveguide Mould.The infrared light of the detection of optical receiver 206 lateral transport in optical waveguide 205, constitutes the pith of touch control detection.Work as optics Stylus 201 in the state of launching infrared black light, touch by contact or long-range non-contact can all constitute with infrared touch screen The positioning of operation object is realized in control interaction, the light intensity variation detected by optical receiver 206.
Special emphasis is: when the light of infrared band is as detection light, the period of coupling grating is larger, this leads to grating Diffraction light is stronger, if not having the visible light of spectral filtering film 203 to filter before grating, can cause watch because of diffraction, and Spectral filtering optical film 203 has reflection visible light, transmits the effect of black light, can reduce the same of large period optical grating diffraction When do not influence show light.
Fig. 6 is the embodiment 1 of the infrared touch screen the present invention is based on grating in projection systems as the vertical of reflection curtain Body schematic diagram.Including optical touch control pen 201, being used to touch screen user, the shape and material of optical touch control pen are unlimited, Mainly light source is made of visible light and black light.Showing Information Level 202 at this time is the reflection curtain of projection, is thrown for showing Shadow information.Spectral filtering optical film 203 meets reflection visible light, transmits the effect of infrared black light.Spectral filtering optical film 203 one sides far from touch-control user place light waveguide-layer 205.Light waveguide-layer 205 is upper on one side to have grating 204.Light waveguide-layer 205 surrounding is provided with optical receiver 206.If grating 204 is facing towards spectral filtering optical film 203.
When work, optical touch control pen 201 is simultaneously emitted by visible light and black light, and visible light is by spectral filtering film first 203 reflections cross spectral filtering optical film without visible transmission for identifying to the position of user and spectators' interaction touch point 203, when passing through grating 204, the infrared light of certain wavelength enters light waveguide-layer 205, and the lateral transport in light waveguide-layer, at For wave guide mode.The infrared light of the detection of optical receiver 206 lateral transport in optical waveguide 205, constitutes the pith of touch control detection. When optical touch-control pen 201 is in the state of launching infrared black light, contact or it is long-range it is non-contact all can be with infrared touch screen Touch-control interaction is constituted, the positioning of operation object is realized in the light intensity variation detected by optical receiver 206.
Embodiment 2
Fig. 7 is the structural schematic diagram of the example 2 of the infrared touch screen the present invention is based on grating, the display system for non-projection In system, the display Information Level 202 is liquid crystal display panel or organic luminous layer at this time, and spectral filtering optical film 203 pastes at this time It closes in display side of the Information Level 202 far from user.Optical touch control pen 201 uses, optical touch control to touch screen user Pen shape and material are unlimited, and mainly light source is made of visible light and black light.Spectral filtering optical film 203 meets reflection Visible light transmits the effect of infrared black light.Spectral filtering optical film 203 places optical waveguide far from the one side of touch-control user Layer 205.Light waveguide-layer 205 far from the one side of user have grating 204.205 every groups of adjacent sides of transparent light waveguide-layer are respectively provided with There is optical receiver 206.If grating 204 is made of clear material facing towards spectral filtering optical film 203.
Benefit using spectral filtering optical film 203 is, in the case where not influencing touch-control interaction, to greatly reduce big week Influence of the optical grating diffraction light of phase to display effect, improves the viewing experience of user.
Experiment shows that the present invention utilizes grating diffration, and the black light of specific wavelength becomes touching in optical touch control pen Control the detection light of point, it is seen that light is the effect of home position, and touch-control is made to hand over the effect for the display system that is independent of each other.And spectrum mistake Filter membrane has reflection visible light, transmits the effect of black light, greatly reduces grating diffration light, brings good user Experience.

Claims (10)

1. a kind of infrared touch-control screen system based on grating, it is characterised in that including optical touch control pen (201), display Information Level (202), spectral filtering optical film (203), grating (204), light waveguide-layer (205) and optical receiver (206), by the display (205 constitute touch screen, the light-receiving for Information Level (202), spectral filtering optical film (203), grating (204), light waveguide-layer Device (206) is placed in the periphery of the light waveguide-layer (205), and the optical touch control pen (201) launches visible light simultaneously On the black light to the touch screen of specific wavelength, the black light of the specific wavelength is can be by the grating (204) diffraction becomes the black light for the wave guide mode that can be transmitted in the light waveguide-layer (205), reaches the light-receiving Detection light of the device (206) as touch-control, is converted into the current signal of display position.
2. the infrared touch-control screen system based on grating as described in claim 1, it is characterised in that the optical touch control pen (201) be simultaneously emitted by the black light of visible light and specific wavelength, it is seen that light for identifying position of touch, specific wavelength can not The light-exposed detection light as touch-control.
3. the infrared touch-control screen system based on grating as described in claim 1, it is characterised in that the display Information Level It (202) is the reflection curtain of projection or the display layer of non-projection.
4. the infrared touch-control screen system based on grating as described in claim 1, it is characterised in that the spectral filtering optics Film (203) has the function of reflecting the visible light and the transmission black light respectively.
5. the infrared touch-control screen system based on grating as described in claim 1, it is characterised in that the spectral filtering optics Film (203) is placed in side of display Information Level (202) far from user, is bonded or is not bonded with the display Information Level (202).
6. the infrared touch-control screen system based on grating as described in claim 1, it is characterised in that the light waveguide-layer (205) Material be the monolayer material or multilayer material transparent to black light, the refractive index of the material of the light waveguide-layer (205) It is single or gradual change.
7. the infrared touch-control screen system based on grating as described in claim 1, it is characterised in that the light waveguide-layer (205) Spectral filtering optical film (203) are placed in be bonded or be not bonded with the spectral filtering optical film (203) far from the side of user； If fitted, then the refractive index of the material of the light waveguide-layer (205) is reflected not less than the spectral filtering optical film (203) Rate.
8. the infrared touch-control screen system based on grating as described in claim 1, it is characterised in that be covered on light waveguide-layer (205) On grating (204) period size meet issue the optical touch control pen (201) at least one black light at For waveguide detection light.
9. the infrared touch-control screen system based on grating as described in claim 1, it is characterised in that grating (204) covering The light waveguide-layer (205) any one side or be placed in the light waveguide-layer (205).
10. the infrared touch-control screen system as described in any one of claim 1 to 9 based on grating, it is characterised in that described can The wave-length coverage of light-exposed wavelength is 380nm to 780nm, and the wave-length coverage of the black light wavelength of the specific wavelength is 780nm or more.
CN201910698630.3A 2019-07-31 2019-07-31 Infrared touch-control screen system based on grating Pending CN110502145A (en)

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CN201910698630.3A CN110502145A (en) 2019-07-31 2019-07-31 Infrared touch-control screen system based on grating
PCT/CN2020/076900 WO2021017464A1 (en) 2019-07-31 2020-02-27 Grating-based infrared touch-control screen system

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CN201910698630.3A CN110502145A (en) 2019-07-31 2019-07-31 Infrared touch-control screen system based on grating

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WO2021017464A1 (en) * 2019-07-31 2021-02-04 上海交通大学 Grating-based infrared touch-control screen system
CN112799546A (en) * 2021-01-26 2021-05-14 广州创知科技有限公司 Touch detection method and device, interactive panel and storage medium
WO2022246807A1 (en) * 2021-05-28 2022-12-01 Huawei Technologies Co., Ltd. Electronic apparatus comprising haptic feedback arrangement and method of providing such feedback

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CN102117151A (en) * 2009-12-31 2011-07-06 中强光电股份有限公司 Optical touch-control display device
CN102346598A (en) * 2010-08-03 2012-02-08 硕擎科技股份有限公司 Optical touch system using screen light and design method thereof
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO2021017464A1 (en) * 2019-07-31 2021-02-04 上海交通大学 Grating-based infrared touch-control screen system
CN112799546A (en) * 2021-01-26 2021-05-14 广州创知科技有限公司 Touch detection method and device, interactive panel and storage medium
WO2022246807A1 (en) * 2021-05-28 2022-12-01 Huawei Technologies Co., Ltd. Electronic apparatus comprising haptic feedback arrangement and method of providing such feedback

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Application publication date: 20191126