CN117111775A - Optical touch module based on visible absorption infrared transmission grating - Google Patents
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
Abstract
The invention relates to an optical touch module based on a visible absorption infrared transmission grating, which comprises an infrared grating waveguide grating layer, wherein the infrared grating waveguide grating layer comprises an infrared high transmission grating and a grating arranged on the infrared high transmission grating; the infrared high-transmission grid absorbs visible light and high-transmission infrared light; the grating is configured to couple invisible light of a specific wavelength into an optical waveguide mode that is transmissible within the grating layer and around the infrared high-transmittance grating. According to the infrared laser pen, the infrared laser pen is used for emitting invisible light, the invisible light with specific wavelength is diffracted into a waveguide mode capable of being transmitted in an infrared raster waveguide grid layer through a raster on the touch screen, and the waveguide mode is transmitted to the light receiver to be detected light for touch control; the non-contact touch control can be realized without additionally providing a camera recognition system; the use of the grating waveguide grid layer can filter the received external strong light and visible light, so that the touch accuracy of the touch screen is improved.
Description
Technical Field
The invention relates to an optical touch module based on a visible absorption infrared transmission grating, and belongs to the technical field of screen touch.
Background
Along with the rapid development of touch technology, touch screens are widely visible everywhere, and the application is quite popular, so that great convenience is brought to the life of people. Currently, classifying according to the principle of touch technology, a touch screen mainly comprises: resistance sensing type touch screen, capacitive sensing type touch screen, optical sensing type touch screen. The resistive touch screen and the capacitive touch screen are all mainstream in the market all the time, but the development of the capacitive touch screen is greatly limited due to the high cost of the capacitive touch screen, but along with the development of the optical infrared touch screen, an infrared touch screen system which is not interfered by current, voltage and static electricity is obtained. The infrared touch technology has low cost and convenient installation, and the infrared touch outer frame with corresponding size can be installed according to the size of the display screen to realize touch and the response time of infrared touch is fast, because the processing speed of light is superior to that of electricity.
In the prior art, the non-contact touch control mostly needs to add a camera system outside a contact type screen system to perform image recognition of a human-computer interaction touch control position, but the defects of the mode are obvious. Firstly, the movement range of a human body is limited, and an identification target cannot be shielded at will; second, adding cameras and image processing systems is costly.
At present, there is an optical waveguide type optical touch screen (CN 104020896A 202123304826.1, 201510220923.2) based on a grating structure, in which although infrared light is mentioned as detection light, when the existing infrared touch screen is used, external strong light and visible light are not filtered, for example, sunlight itself contains infrared waves, and diffraction can cause incapability of viewing when the sunlight irradiates the touch screen, so that interference is brought to touch positioning.
Disclosure of Invention
In order to overcome the problems, the invention provides an optical touch module based on a visible absorption infrared transmission grating, which emits invisible light by using an infrared laser pen, wherein the invisible light with a specific wavelength is diffracted into a waveguide mode capable of being transmitted in an infrared grating waveguide grid layer by a grating on a touch screen, and is transmitted to an optical receiver to become detection light for touch; the non-contact touch control can be realized without additionally providing a camera recognition system; the use of the grating waveguide grid layer can filter the received external strong light and visible light, so that the touch accuracy of the touch screen is improved. Meanwhile, the grid made of the visible light absorbing material can be used as a black matrix in the liquid crystal layer of the existing liquid crystal display and between LED pixels of the LED display, so that light crosstalk is prevented and display contrast is improved.
The technical scheme of the invention is as follows:
first aspect
An optical touch module based on visible absorption infrared transmission grating comprises an infrared grating waveguide grating layer arranged below a screen, wherein the infrared grating waveguide grating layer comprises an infrared high-transmission grating and a grating arranged on the infrared high-transmission grating; the infrared high-transmission grid absorbs visible light and high-transmission infrared light; the grating is configured to couple invisible light of a specific wavelength into an optical waveguide mode that is transmissible within the infrared grating waveguide mesh layer and around the infrared high-transmission mesh.
Further, the gratings arranged on the infrared high-transmittance grid are one-dimensional or two-dimensional, and the structure distribution of the gratings is continuous or a lattice.
Further, the arrangement of the grating on the infrared high-transmittance grid includes:
the infrared high-transmittance grid is arranged at line crossing points;
incomplete coverage arrangement at line intersections of the infrared high-transmission grid
The infrared high-transmittance grid is arranged on the lines of the infrared high-transmittance grid;
and the lines of the infrared high-transmittance grid are not fully covered.
Further, the infrared high-transmittance grid is used as a black matrix between color filter pixels, or an anti-crosstalk and anti-reflection black matrix between LED display screen pixels, or is positioned between LED backlight LED chips.
Further, the invisible light of a specific wavelength is infrared light.
Further, the infrared light source device further comprises a plurality of light receivers, wherein the light receivers are arranged around the infrared grating waveguide grid layer, and light transmitted to the light receivers by the infrared grating waveguide grid layer is used as detection light for touch control and is converted into current signals for positioning.
Further, the device also comprises a light source, wherein the light source can emit invisible light with a specific wavelength; the invisible light of the specific wavelength is infrared light.
Further, the grating is a metal, metal oxide or medium plated grating; the material of the metal comprises silver, copper, aluminum and nickel; the material of the metal oxide comprises titanium dioxide and silicon dioxide.
Furthermore, the infrared high-transmission grid is prepared by using an infrared high-transmission material through dispensing equipment, and can absorb incident non-signal light; the infrared high-transmittance grid can be made of black photoresist, chromium, carbon black, BZH powder-containing resin and high-blackness aniline black-containing resin.
Second aspect
A screen touch method, which performs screen touch through the optical touch module based on visible absorption infrared transmission grating of the first aspect, includes:
controlling a light source to emit invisible light with a specific wavelength towards the screen;
receiving invisible light with specific wavelength of a waveguide mode transmitted in the grid layer of the infrared raster waveguide through a plurality of light receivers;
and positioning the touch position of the screen according to the light intensity change received by each light receiver.
The invention has the following beneficial effects:
according to the infrared laser pen, the infrared laser pen is used for emitting invisible light, the invisible light with specific wavelength is diffracted into a waveguide mode capable of being transmitted in an infrared raster waveguide grid layer through a raster on the touch screen, and the waveguide mode is transmitted to the light receiver to be detected light for touch control; the non-contact touch control can be realized without additionally providing a camera recognition system; the infrared grating waveguide can be used for filtering received external strong light and visible light, so that the touch accuracy of the touch screen is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display device including an optical touch module according to an embodiment of the invention.
Fig. 2 is a schematic diagram of an infrared grating waveguide grid layer structure of an infrared grating covered on a crossing point according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of coupling transmission of an incident optical waveguide according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an optical touch module according to an embodiment of the invention.
Fig. 5 is a schematic diagram of a display device including an optical touch module according to an embodiment of the invention.
Fig. 6 is a schematic diagram of an infrared grating waveguide grid layer structure of a full-coverage grating according to an embodiment of the present invention.
Detailed Description
The invention will now be described in detail with reference to the drawings and to specific embodiments.
First aspect
Referring to fig. 1 to 5, an optical touch module based on a visible absorption infrared transmission grating comprises an infrared grating waveguide grating layer arranged below a screen, wherein the infrared grating waveguide grating layer comprises an infrared high transmission grating and a grating arranged on the infrared high transmission grating; the infrared high-transmission grid absorbs visible light and high-transmission infrared light; the grating is configured to couple invisible light of a specific wavelength into an optical waveguide mode that is transmissible within the infrared grating waveguide mesh layer and around the infrared high-transmission mesh.
The infrared high-transmittance grid is used as a black matrix between color filter pixels, or an anti-crosstalk and anti-reflection black matrix between LED display screen pixels, or is positioned between LED backlight LED chips.
The transmitted light is the detection light, and touch control positioning can be performed by acquiring the detection light.
201 in fig. 1 and 3 is an infrared laser pen.
As shown in fig. 1, the screen under the present invention is understood to be the rear of the display panel away from the viewing side, and in one embodiment of the present invention, the screen is a Mini-LED panel, and the grid layer of the infrared raster waveguide is disposed on the Mini-LED backlight layer of the Mini-LED panel away from the viewing side.
The coupling formula of +1 and-1 of the grating waveguide is as follows:
wherein k is 0 Wavenumber in vacuum, n 0 Is the refractive index of the incident medium, θ is the incident angle in the waveguide, T is the grating period, n is the refractive index of the waveguide, n eff Is the effective refractive index of the waveguide. The absolute value part in equation (1) is positive for +1 order diffracted light, and negative for-1 order diffracted light. And has n 1 >n 0 ，
The following condition is satisfied in order to make +1-order diffracted light into a waveguide mode in the waveguide, which is simply available according to the formula (1):
where λ is the wavelength of the incident light in vacuum.
When the incident angle θ and the grating period T are determined, it is obvious that only the wavelength of the incident light satisfies the above formula (2) and formula (3), it is possible to become a waveguide mode and propagate laterally in any layer of the display, and the light with other wavelengths will be emitted through the grating waveguide.
The human eye can feel the wavelength range of 380nm to 780nm, and the wavelength range of infrared rays is 760nm to 1mm. According to the theory, the infrared invisible light of 780nm and above becomes a waveguide mode by setting the proper grating period and considering the + -1-order diffraction light, and then the visible light which cannot be coupled into the corresponding grating period in 380nm to 780nm is set for marking the touch position. Therefore, the display of the touch screen is not affected, and meanwhile, the invisible light wavelength is used as the detection light, so that the user experience is improved.
In one embodiment, the infrared high-transmittance grid is prepared from an infrared high-transmittance material through dispensing and nanoimprint processes and is used for absorbing incident non-signal light; the infrared high-transmittance grid can be made of black photoresist, chromium, carbon black, BZH powder-containing resin and high-blackness aniline black-containing resin.
In one embodiment, the grating is obtained by embossing a grating structure with the grating semi-cured and baking to cure the grating to obtain an infrared grating waveguide grating layer,
referring to fig. 2 and 6, in one embodiment of the present invention, the gratings disposed on the infrared high-transmittance grid are one-dimensional or two-dimensional, and the structure distribution of the gratings is continuous or a lattice.
By providing the grating structure, the propagation direction of the detection light can be controlled, thereby performing positioning according to the detection light.
When the grating is in a lattice structure, the moire can be eliminated, and the display effect is improved.
Referring to fig. 2 and 6, in one embodiment of the present invention, the arrangement of the grating on the infrared high-transmittance grid includes:
the infrared high-transmittance grid is arranged at line crossing points;
incomplete coverage arrangement at line intersections of the infrared high-transmission grid
The infrared high-transmittance grid is arranged on the lines of the infrared high-transmittance grid;
and the lines of the infrared high-transmittance grid are not fully covered.
Fig. 2 shows the arrangement of the grating at the line intersections of the infrared high-transmittance grid. Fig. 6 shows the arrangement of the grating on the lines of the infrared high-transmission grid. Different setting modes enable the transmission modes of the optical waveguides to be different, and further influence the transmission capacity loss.
The touch accuracy can be adjusted through full coverage setting and incomplete coverage setting on the line crossing points and the lines of the infrared high-transmission grid. The device is arranged according to actual needs, and the balance between cost and performance can be achieved. The efficiency of the detector can also be maximized by optimizing the duty cycle.
Referring to fig. 4, in one embodiment of the invention, the lines of the infrared high-transmittance grid are disposed between the pixels of the screen as an anti-crosstalk and anti-reflection black matrix between the pixels of the LED display screen. The grating is disposed over the grid.
Referring to fig. 1, in one embodiment of the present invention, a filter disposed under the grating waveguide mesh layer is further included, the filter being for filtering visible light.
In one embodiment, the infrared high-transmittance grid is disposed over the filter as a black matrix between the color filter pixels.
In one embodiment of the invention, the invisible light of a particular wavelength is infrared light.
In one embodiment of the present invention, the present invention further includes a plurality of light receivers, wherein the light receivers are disposed around the grating waveguide mesh layer, and light transmitted to the light receivers by the grating waveguide mesh layer is used as detection light for touch control and converted into a current signal for positioning.
In one embodiment, the light receivers are arranged around the grid layer of the infrared raster waveguide, that is, a plurality of light receivers are arranged on each edge, and the touch position can be positioned by collecting detection light.
In one embodiment of the present invention, the light source is capable of emitting invisible light of a specific wavelength or both visible light and invisible light of a specific wavelength; the invisible light of the specific wavelength is infrared light.
When both visible light and invisible light of a specific wavelength are emitted, the light can be used for human eyes to identify the pointing position. For example, in one embodiment, the visible light is directed at the same location as the invisible light.
In one embodiment, the light source is a laser pen, and the infrared laser pen emits both visible light and invisible light. Visible light is reflected to identify the touch location, and invisible light is used as detection light.
In one embodiment of the present invention, the grating is a grating used in a conventional display device or a grating plated with a metal film, a metal oxide film or a dielectric film; the material of the metal film comprises silver, copper, aluminum and nickel; the material of the metal oxide film comprises titanium dioxide and silicon dioxide.
Second aspect
A screen touch method, which performs screen touch through the optical touch module based on visible absorption infrared transmission grating of the first aspect, includes:
controlling a light source to emit invisible light with specific wavelength towards the screen singly or simultaneously, emitting visible light and invisible light with consistent directions;
receiving invisible light with specific wavelength of a waveguide mode transmitted in the grid layer of the infrared raster waveguide through a plurality of light receivers;
and positioning the touch position of the screen according to the light intensity change received by each light receiver.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures made by the description of the invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the invention.
Claims (10)
1. The optical touch module based on the visible absorption infrared transmission grating is characterized by comprising an infrared grating waveguide grating layer, wherein the infrared grating waveguide grating layer comprises an infrared high-transmission grating and a grating arranged on the infrared high-transmission grating; the infrared high-transmission grid absorbs visible light and transmits infrared light; the grating is configured to couple invisible light of a specific wavelength into an optical waveguide mode that is transmissible within the infrared grating waveguide mesh layer and around the infrared high-transmission mesh.
2. The optical touch module based on the visible absorption infrared transmission grating according to claim 1, wherein the grating arranged on the infrared high transmission grid is one-dimensional or two-dimensional, and the structure distribution of the grating is continuous or a lattice.
3. The optical touch module based on a visible-absorption infrared transmission grating according to claim 1, wherein the arrangement of the grating on the infrared high transmission grid comprises:
the infrared high-transmittance grid is arranged at line crossing points;
incomplete coverage arrangement at line intersections of the infrared high-transmission grid
The infrared high-transmittance grid is arranged on the lines of the infrared high-transmittance grid;
and the lines of the infrared high-transmittance grid are not fully covered.
4. The optical touch module based on visible-absorption infrared transmission grating according to claim 1, wherein the infrared high-transmission grid is used as a black matrix between color filter pixels, or an anti-crosstalk and anti-reflection black matrix between LED display screen pixels, or is located between LED backlight LED chips.
5. The optical touch module based on the visible-absorption infrared transmission grating according to claim 1, wherein the invisible light with a specific wavelength is infrared light.
6. The optical touch module based on the visible absorption infrared transmission grating according to claim 1, further comprising a plurality of light receivers, wherein the light receivers are arranged around the infrared grating waveguide grating layer, and light transmitted to the light receivers by the infrared grating waveguide grating layer is used as detection light for touch control and is converted into a current signal for positioning.
7. The optical touch module based on the visible-absorption infrared transmission grating according to claim 1, further comprising a light source capable of emitting invisible light of a specific wavelength; the invisible light of the specific wavelength is infrared light.
8. The optical touch module based on a visible-absorption infrared transmission grating according to claim 1, wherein the grating is light plated with a metal, a metal oxide or a dielectric film; the material of the metal comprises silver, copper, aluminum and nickel; the material of the metal oxide comprises titanium dioxide and silicon dioxide.
9. The optical touch module based on the visible absorption infrared transmission grating according to claim 1, wherein the infrared high transmission grid is prepared by using an infrared high transmission material through dispensing equipment and can absorb incident non-signal light; the infrared high-transmittance grid can be made of black photoresist, chromium, carbon black, BZH powder-containing resin and high-blackness aniline black-containing resin.
10. A screen touch method for performing screen touch by the optical touch module based on visible-absorption infrared transmission grating according to any one of claims 1 to 9, comprising:
controlling a light source to emit invisible light with specific wavelength towards the screen singly or simultaneously, emitting visible light and invisible light with consistent directions;
receiving invisible light with specific wavelength of a waveguide mode transmitted in the grid layer of the infrared raster waveguide through a plurality of light receivers;
and positioning the touch position of the screen according to the light intensity change received by each light receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311037721.5A CN117111775A (en) | 2023-08-17 | 2023-08-17 | Optical touch module based on visible absorption infrared transmission grating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311037721.5A CN117111775A (en) | 2023-08-17 | 2023-08-17 | Optical touch module based on visible absorption infrared transmission grating |
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| Publication Number | Publication Date |
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| CN117111775A true CN117111775A (en) | 2023-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311037721.5A Pending CN117111775A (en) | 2023-08-17 | 2023-08-17 | Optical touch module based on visible absorption infrared transmission grating |
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| Country | Link |
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| CN (1) | CN117111775A (en) |
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- 2023-08-17 CN CN202311037721.5A patent/CN117111775A/en active Pending
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