KR101786550B1 - Middle-large range of infrared touch screen system for enhancing the meaningful touch signal and solving the occlusion induced overlaid multi touches - Google Patents

Abstract

The middle- or large-sized infrared touch screen system for reducing significant signal strength enhancement and signal blurring due to redundant touch according to an embodiment of the present invention includes a touch optical plate formed on the upper part of the display unit, A plurality of infrared light emitting elements and a plurality of infrared light receiving elements formed on the outer surface of the touch optical plate so as to have a phase plane and a plurality of infrared light receiving elements arranged on the outer side of the touch optical plate, And at least two IR cameras that image the change of the IR camera.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a middle-sized and large-sized infrared touch screen system for enhancing a touch signal,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a middle- or large-sized infrared touch screen system for reducing a signal blur due to a significant reinforcement of a touch signal and an overlapping touch through an infrared (IR)

In the touch screen technology, an arbitrary transparent optical plate is disposed at an upper end of an image display device for displaying a 2D image so that a touch can be externally applied, a touch signal for recognizing a position with respect to an external touch is generated, . Representative methods of implementing touch screen technology include IR sensing method and IR camera method.

A typical IR sensing method includes an infrared light emitting unit having a one-dimensional array composed of a plurality of infrared light emitting elements for generating a light flux in the infrared region, a plurality of infrared light receiving elements for receiving infrared light fluxes generated from the infrared light emitting unit, And the infrared light receiving unit of the one-dimensional array is disposed on the outer surface of the touch optical plate.

Specifically, the infrared ray emitting unit and the infrared ray receiving unit are disposed in a relatively high phase plane relative to the top surface of the touch optical plate and are arranged to face each other. In the course of the infrared ray beams generated in the infrared ray emitting unit proceeding to the infrared ray receiving unit, When the external touch is applied to the upper surface of the plate, the infrared rays are obscured by the external touch, thereby detecting the difference in the amount of flux falling into the infrared light receiving portion and detecting the position and the number of external touches continuously or discontinuously Method.

 This approach has the advantage that the technology can be applied regardless of the size of the touch screen system. However, accuracy of the position of the touch signal occurs due to the degree of condensation of the infrared ray flux generated from the infrared ray emitting element.

More specifically, when the infrared ray condensing degree is high, the solid angle of the infrared ray bundle distribution becomes small and the light beam density becomes high, so that the straightness of the infrared ray bundle bundle is improved. Therefore, since the intensity difference of the light receiving signal with respect to the external touch becomes clear, it is possible to accurately detect the touch signal.

On the other hand, when the infrared ray condensing degree is low, the solid angle increases and the luminous flux density decreases, and it becomes difficult to distinguish the difference in intensity of the necessary / sufficient infrared ray flux amount generated with respect to the external touch. As a result, an incorrect touch position is detected. In addition, when the solid angle is wide, since the light receiving element is exposed to the outside, it also reacts to other external infrared signals other than the external touch, so that it is not easy to distinguish a significant touch signal from the external touch and external infrared noise .

In addition, due to the step difference formed by the difference in the position of the mounting surface between the touch optical plate, the infrared ray emitting unit and the infrared ray receiving unit, external contaminants can easily flow into the touch optical plate, thereby being vulnerable to external contamination. There are disadvantages.

Other typical IR sensing schemes include a one-dimensional array of infrared light emitting units composed of a plurality of infrared light emitting elements for generating a light flux in the infrared region, a plurality of infrared light receiving units for receiving the infrared light fluxes generated from the infrared light emitting units There is a method in which the infrared ray receiving portion of the one-dimensional array of the light receiving elements is arranged on the outer surface of the touch optical plate on the same phase plane as the touch optical plate and arranged in a structure facing each other.

More specifically, when an external touch is applied from the top surface of the touch optical plate, infrared light fluxes generated in the infrared light emitting element enter the inside of the touch optical plate and proceed to total internal reflection and are received by the infrared light receiving element. The infrared light fluxes flowing along the interface are reflected and scattered by the external touch object and are recurrently incident into the touch optical plate, thereby detecting a difference in the amount of light flux that is increased or decreased in the amount of light flux entering the infrared light receiving element, And the number is continuously or discontinuously detected.

Unlike the method described earlier, this method is advantageous in that it has no step between the touch optical plate, the infrared light emitting unit, and the infrared light receiving unit, and can be implemented in a form that is strong against external contamination and integrated.

However, since the infrared ray emitting portion and the infrared ray receiving portion are located on the same phase plane as the touch optical plate, and the infrared ray fluxes generated by each of the light emitting elements are crossed or dispersed with each other during total internal reflection inside the touch optical plate, Unlike the high light flux matching ratio between the infrared light emitting element and the infrared light receiving element in the above-described method, since the light fluxes spread throughout the infrared light receiving portion are detected, the matching ratio between the infrared light emitting element and the infrared light receiving element is lowered . In addition, there is a disadvantage in that it is difficult to clearly distinguish between the infrared rays which are totally internally captured and which are incident on the infrared ray receiving portion and the rays which are refracted by the external touch. In addition, when there are a plurality of external touches and they are adjacent to each other, it is not easy to distinguish and detect the generated touch position.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a middle- or large-sized infrared touch screen system for reducing meaningful touch signal reinforcement to distinguish only meaningful touch signals for external touches and signal blurring due to redundant touches through at least two IR cameras disposed on the outside of the touch screen .

It is another object of the present invention to provide a touch screen device and a touch screen device which are capable of distinguishing a plurality of touches performed on the same line into respective touch signals through an IR camera arranged orthogonally to each other on the outside of the touch screen, And to provide a medium to large-sized infrared touch screen system that reduces blurring.

According to an aspect of the present invention, there is provided a middle- or large-sized infrared touch screen system for reducing significant signal strength enhancement and signal blurring due to redundant touches, including a touch optical plate formed on a display unit, A plurality of infrared light emitting elements and a plurality of infrared light receiving elements which are formed on the outer surface of the touch optical plate so as to have the same phase plane as the upper surface of the touch optical plate, And at least two IR cameras for imaging a change in the amount of infrared light that is recursive incident in response to an external touch.

In an embodiment, each of the at least two IR cameras may include a cylinder lens of uniaxial light refracting power.

In an embodiment, the at least two IR cameras may be disposed at corner portions of the polygon when the shape of the touch optical plate is polygonal.

In an exemplary embodiment, the at least two IR cameras may be disposed at an outer surface of the polygon or at a center of the outer surface when the shape of the touch optical plate is polygonal.

In an embodiment, the at least two IR cameras may be arranged at regular intervals on the outer periphery of the touch optical plate.

In one embodiment of the present invention, an image captured by an IR camera disposed at positions orthogonal to each other among the at least two IR cameras is analyzed, and a plurality of touch signals generated by a plurality of external touches performed on a specific co- As shown in FIG.

In one embodiment, the plurality of infrared light-emitting elements and the plurality of infrared light-receiving elements are successively arranged so as to intersect one another linearly on the outer surface of the touch optical plate, .

The effect of the middle / large-sized infrared touch screen system for reducing significant signal-signal reinforcement and signal blinding due to redundant touch according to the present invention will be described below.

According to at least one of the embodiments of the present invention, it is possible to distinguish only a significant touch signal with respect to an external touch through at least two IR cameras disposed on the outside of the touch screen.

In addition, according to at least one embodiment of the present invention, a plurality of touches performed on the same line can be divided into respective touch signals through the IR camera arranged orthogonally to each other on the outside of the touch screen, and the touch signals can be clearly detected.

FIG. 1 is a view illustrating a display unit and a touch optical plate included in a middle / large-sized infrared touch screen system for reducing significant signal-signal reinforcement and signal blurring due to redundant touch according to an exemplary embodiment of the present invention.
FIG. 2 is a diagram illustrating an infrared light emitting device and an infrared light receiving device included in a medium and large-sized infrared touch screen system for reducing significant signal-signal reinforcement and signal blurring due to redundant touch according to an exemplary embodiment of the present invention.
3 is a diagram illustrating an infrared light emitting device, an infrared light receiving device, and a touch optical plate included in a medium and large-sized infrared touch screen system for reducing a signal blurring due to significant touch signal reinforcement and redundant touch according to an exemplary embodiment of the present invention.
FIG. 4 is a diagram illustrating an example in which at least two IR cameras are disposed on the outer periphery of a touch screen in a medium and large-sized infrared touch screen system that reduces significant signal-signal reinforcement and signal blurring due to redundant touch according to an exemplary embodiment of the present invention .
5 is a view illustrating a polarizing element of an infrared light emitting element and a polarizing element of an infrared light receiving element included in a middle / large-sized infrared touch screen system that reduces signal blurring due to significant touch signal reinforcement and overlapping touch according to an exemplary embodiment of the present invention to be.
6 is a diagram illustrating an infrared light emitting device, an infrared light receiving device, a polarizing device, and a touch optical plate included in a medium and large-sized infrared touch screen system for reducing significant signal strength enhancement and signal blurring due to overlapping touch according to an exemplary embodiment of the present invention FIG.
FIG. 7 is a diagram illustrating an infrared scatterer distributed on a top surface of a touch optical plate included in a medium and large-sized infrared touch screen system for reducing a significant blurring of a touch signal and a signal blurring due to a redundant touch according to an exemplary embodiment of the present invention.
FIG. 8 is a graph showing the relationship between the IR-QWP of the phase retarder film included in the middle and large-sized infrared touch screen system, which reduces the signal blurring due to the significant reinforcement of the touch signal and the overlapping touch according to the embodiment of the present invention, Fig.
9 is a sectional view of an example in which the IR-QWP of FIG. 8 is formed on the upper surface of the touch optical plate.
FIG. 10 is a diagram illustrating an IR-HWP and a puncturing structure of a phase retarder film included in a middle / large-sized infrared touch screen system for reducing a signal blurring due to significant touch signal reinforcement and redundant touch according to an exemplary embodiment of the present invention.
FIG. 11 is a diagram illustrating an endless touch screen structure in which IR-QWP is applied to a medium-sized and large-sized infrared touch screen system that reduces significant signal-signal reinforcement and signal blindness due to redundant touch according to an embodiment of the present invention.
FIG. 12 is a diagram illustrating an endless touch screen structure to which an IR-HWP is applied to a medium and large-sized infrared touch screen system that reduces significant signal strength enhancement and signal blindness due to redundant touch according to an exemplary embodiment of the present invention.
FIG. 13 is an endless touch screen structure in which an IR-QWP is applied to a medium and large-sized infrared touch screen system that reduces significant signal strength enhancement due to reinforcement of a touch signal and overlapping touch according to an embodiment of the present invention. Is a diagram showing delayed optical characteristics.
FIG. 14 is a diagram illustrating the structure of an uninterrupted touch screen to which IR-HWP is applied in a medium to large-sized infrared touch screen system for reducing significant signal strength enhancement and signal blinding due to redundant touches according to an exemplary embodiment of the present invention. Is a diagram showing delayed optical characteristics.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

FIG. 1 is a view illustrating a display unit and a touch optical plate included in a middle / large-sized infrared touch screen system for reducing significant signal-signal reinforcement and signal blurring due to redundant touch according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the middle- or large-sized infrared touch screen system for reducing significant signal strength enhancement and signal blurring due to redundant touches may include a display unit 110 and a touch optical plate 120. Here, the display unit 110 may include an image display device capable of displaying images, and may be located at a lower end of the touch screen system so that an observer can view an image through a touch screen system.

On the other hand, the image provided through the display unit 110 can be divided into a background image that is not related to the external touch and a display image corresponding to the external touch, which can be provided independently or depending on whether there is an external touch have.

In addition, the middle- or large-sized infrared touch screen system for reducing the signal blurring due to the significant reinforcement of the touch signal and the redundant touch according to the present invention may further include an infrared light emitting element, an infrared light receiving element, and a polarizing element. This will be described in detail.

FIG. 2 is a diagram illustrating an infrared light emitting device and an infrared light receiving device included in a medium and large-sized infrared touch screen system for reducing significant signal-signal reinforcement and signal blurring due to redundant touch according to an exemplary embodiment of the present invention.

2, a plurality of infrared light emitting devices 201 and a plurality of infrared light receiving devices 202 may be continuously arranged so as to intersect with each other, and may be arranged in a one-dimensional linear shape 200 on four surfaces outside the touch optical plate have.

Here, the center wavelength of the infrared light emitting element 201 can be selectively applied within a near infrared range, and the infrared light emitting element 201 and the infrared light receiving element 202 can have the same optical characteristics.

On the other hand, the divergent directivity angle can be adjusted by attaching a convex lens to the light emitting surface of the infrared light emitting element 201. The detection wavelength range of the infrared light receiving element 202 is a conjugate with the central wavelength range of the infrared light emitting element 201 to be used. Similarly, the light receiving directivity angle is adjusted by attaching a convex lens to the light receiving surface of the infrared light receiving element 202 .

3 is a diagram illustrating an infrared light emitting device, an infrared light receiving device, and a touch optical plate included in a medium and large-sized infrared touch screen system for reducing a signal blurring due to significant touch signal reinforcement and redundant touch according to an exemplary embodiment of the present invention.

3, a plurality of infrared light emitting elements 201 and a plurality of infrared light receiving elements 202 are continuously arranged so as to intersect with each other, and are arranged in a one-dimensional linear shape 200 on four surfaces outside the touch optical plate Can be confirmed.

Here, the plurality of infrared light emitting devices 201 and the plurality of infrared light receiving devices 202 may be arranged in a form having the same phase surface so that there is no step difference from the upper surface of the touch optical plate. Each of the plurality of infrared light emitting elements 201 and the plurality of infrared light receiving elements 202 can independently emit an infrared light flux and a light receiving function of an infrared light flux under the control of an external power driver or the like.

Specifically, the infrared light beams emitted from the plurality of infrared light emitting elements 211 enter into the inside of the touch optical plate. Here, the emitted infrared ray fluxes are divided into an infrared ray flux satisfying the total internal reflection and a flux passing through the upper surface of the touch screen (refer to FIGS. 11 and 12), and the progressed fluxes are progressed by internal progress or recursive incidence by external touch Reaches the opposite infrared light receiving element 212 located on the opposite side, and its intensity can be detected.

FIG. 4 is a diagram illustrating an example in which at least two IR cameras are disposed on the outer periphery of a touch screen in a medium and large-sized infrared touch screen system that reduces significant signal-signal reinforcement and signal blurring due to redundant touch according to an exemplary embodiment of the present invention .

[0003] In a mid-sized class touch screen system of an IR sensing type, a touch screen is formed by a plurality of infrared light emitting elements and a plurality of infrared light receiving elements arranged on the outer surface of the touch screen, The sensitivity of the signal may be low.

Accordingly, there is a problem that the detection of the touch signal generated by the applied touch is missed or the detection of the position where the touch is applied is not correct as compared with the small touch screen system having a small touch screen size.

In order to solve such a problem, a middle-sized and large-sized infrared touch screen system which reduces significant signal strength enhancement and signal blurring due to redundant touch according to the present invention includes at least two IR cameras on the outside of a touch screen can do.

4, IR cameras 411, 412, 413, and 414 including a cylinder lens having a uniaxial refracting power can be disposed at four corners of the touch screen. In addition, IR cameras 421, 422, 423, and 424 having the same configuration as the size of the touch screen or the need may be additionally disposed at the center of the four outer surfaces or the outer surface of the touch screen.

At least two IR cameras 411, 412, 413, 414, 421, 422, 423, and 424 disposed on the outer periphery of the touch screen are arranged in the center of the middle touch screen, Changes can be imaged. As a result, the middle / large-sized infrared touch screen system, which reduces the signal blurring due to a significant reinforcement of the touch signal and the overlapping touch according to the present invention, is transmitted through the IR cameras 411, 412, 413, 414, 421, 422, 423 and 424 It is possible to distinguish a significant signal which is judged to be a touch signal generated by an external touch among a plurality of signals imaged.

In addition, in the case of a middle or large-sized touch screen, since the size of the touch screen is larger than that of the small-sized touch screen, there is a problem that it is difficult to clearly distinguish a plurality of touch signals generated on the same line. However, according to the present invention, it is possible to analyze a plurality of touch signals generated due to a plurality of touches performed on a specific coaxial line, by analyzing the images acquired by the IR cameras disposed at positions orthogonal to each other, It can be clearly distinguished and detected by touch.

At least two or more IR cameras included in the present invention may be arranged at equal intervals on the outer surface of the touch screen as well as the center of the edge and the outer surface as described above.

That is, according to the present invention, due to the enlargement of the touch screen provided in the middle-sized class touch screen system of the IR sensing type, the touch signal generated in the central area remote from the outer surface of the touch screen is clearly detected .

5 is a view illustrating a polarizing element of an infrared light emitting element and a polarizing element of an infrared light receiving element included in a middle / large-sized infrared touch screen system that reduces signal blurring due to significant touch signal reinforcement and overlapping touch according to an exemplary embodiment of the present invention to be.

5, a linear or circular polarizing element 211 may be disposed on the light emitting surface of the infrared light emitting element 201 to emit the polarized infrared light flux. At the same time, the polarizing element 211 may be disposed as a secondary optical component at the front end of the light-converging convex lens.

In order to receive the polarized infrared light flux, a linear or circular polarizing element 212 may be disposed on the light receiving surface of the infrared light receiving element 202 or may be disposed as a secondary optical component in front of the light receiving convex lens .

When the polarization directions of the infrared light emitting element 201 and the infrared light receiving element 202 are linearly polarized, the internal angle formed by the polarization directions of the polarizing elements 211 and 212 becomes 90 degrees and can be orthogonal to each other. When the polarization direction is circularly polarized light, the polarization rotation direction may be orthogonal to each other as left-right or right-left.

6 is a diagram illustrating an infrared light emitting device, an infrared light receiving device, a polarizing device, and a touch optical plate included in a medium and large-sized infrared touch screen system for reducing significant signal strength enhancement and signal blurring due to overlapping touch according to an exemplary embodiment of the present invention FIG.

6, a one-dimensional linear 200 structure in which a plurality of infrared light emitting elements 201 and a plurality of infrared light receiving elements 202 are continuously arranged to cross each other is disposed on the outer surface of the touch optical plate 120 Can be confirmed.

6, a plurality of infrared light-emitting elements 201 and a plurality of infrared light-receiving elements 202 are successively arranged so as to intersect with each other on the left outer side surface and the right outer side surface of the touch optical plate 120 Respectively.

Here, each of the infrared light emitting element 201 and the infrared light receiving element 202 may be arranged to face each other on the same axis. The polarizing element 211 of the infrared light emitting element 201 and the polarizing element 212 of the infrared light receiving element 202 disposed on the same axis are at an angle of 90 degrees at which the polarization directions are orthogonal to each other.

Only the light flux whose phase is 1/2 retarded by the external touch among the infrared light fluxes output through the infrared light emitting element 201 and the polarizing element 211 reaches the infrared light receiving element 202 through the polarizing element 212 . A detailed description thereof will be continued through Figs. 13 and 14. Fig.

FIG. 7 is a diagram illustrating an infrared scatterer distributed on a top surface of a touch optical plate included in a medium and large-sized infrared touch screen system for reducing a significant blurring of a touch signal and a signal blurring due to a redundant touch according to an exemplary embodiment of the present invention.

As shown in FIG. 7, the touch optical plate 520 is a transparent medium having little influence on external environmental changes such as temperature, pressure, scratches, etc., and may have a flat plate shape having a certain thickness. Each of the outer surfaces of the touching optical plate 520 may have a function of minimizing light loss at the time of incidence and emission of the infrared light flux as the polishing surface. Each polishing surface of the touch-sensitive optical plate 520 has an interior angle formed by the normal line of the upper surface or the lower surface so that the infrared rays of total internal reflection can be emitted to the upper surface of the touch-signal optical plate. The interior angle ranges from an acute angle to an obtuse angle Lt; / RTI >

On the other hand, the upper surface of the touch optical plate 520 is an outer touchable surface, and an infrared scatterer pattern 521 may be formed in order to facilitate the emission of the infrared light flux. The shape of the scatterer 521 pattern may be such that when the incident light passes through the infrared scatterer 521, the light distribution can form a lambertian or a wide Gaussian distribution.

Here, the size of the infrared scatterer 521 can be formed to a size that the observer can not identify with the naked eye, and when the visible light image provided from the display unit passes through the scatterer, it affects the sharpness and contrast of the image It can be formed so as to have optical characteristics that do not exist. The density of the pattern of the infrared scatterers 521 may be different from each other in the area from the outer periphery to the central area in proportion to the size of the touch optical plate 520 and the same infrared light beam emerges from any position in the touch optical plate 520 Or more. On the other hand, the lower surface of the touch optical plate 520 may be in the form of a flat plate abraded with the display unit.

FIG. 8 is a graph showing the relationship between the IR-QWP of the phase retarder film included in the middle and large-sized infrared touch screen system, which reduces the signal blurring due to the significant reinforcement of the touch signal and the overlapping touch according to the embodiment of the present invention, Fig.

Referring to FIG. 8, it can be seen that an Infrared Quarter Wave Plate (IR-QWP) 630 is formed on the touch optical plate 620 as an infrared phase retarder film. The IR-QWP 630, which is an infrared phase retarder, functions to change the polarizing property by modulating the phase value of the infrared light beam wavefront that is incident on and transmitted through the film. A detailed description thereof will be given later with reference to FIG.

9 is a sectional view of an example in which the IR-QWP of FIG. 8 is formed on the upper surface of the touch optical plate.

Referring to FIG. 9, it can be seen that the IR-QWP 630, which is an infrared phase retarder, is in the form of a thin film and is in contact with the top surface of the touch optical plate 620.

FIG. 10 is a diagram illustrating an IR-HWP and a puncturing structure of a phase retarder film included in a middle / large-sized infrared touch screen system for reducing a signal blurring due to significant touch signal reinforcement and redundant touch according to an exemplary embodiment of the present invention.

Referring to FIG. 10, an example is shown in which an Infrared Half Wave Plate (IR-HWP, 830) is applied as an infrared retarder film. The IR-HWP 830, which is an infrared phase retarder, functions to change the polarizing property by modulating the phase value of the infrared light flux wavefront that is incident on and transmitted through the film.

Meanwhile, the IR-HWP 830, which is an infrared phase retarder, is in the form of a thin film, and a plurality of perforations 831 may be provided. Here, the perforations 831 having a porous structure can be arranged two-dimensionally. And, the maximum size of the perforations 831 can be realized so as to satisfy the diffraction limit or less. Also, the inter-center density of the perforations 831 may be the same or different depending on the amount of the infrared ray flux emitted from the upper surface of the touch optical plate. A detailed description thereof will be given later with reference to FIG.

FIG. 11 is a diagram illustrating an endless touch screen structure in which IR-QWP is applied to a medium-sized and large-sized infrared touch screen system that reduces significant signal-signal reinforcement and signal blindness due to redundant touch according to an embodiment of the present invention.

11, the infrared light flux output from the infrared light emitting device 201 located on the left side can pass through the polarizing element 211 and enter the touch optical plate 120, It is possible to reach the polarizing element 212. Then, another part of them reaches IR-QWP 630, which is an infrared phase retarder film, and can go out through IR-QWP 630.

FIG. 12 is a diagram illustrating an endless touch screen structure to which an IR-HWP is applied to a medium and large-sized infrared touch screen system that reduces significant signal strength enhancement and signal blindness due to redundant touch according to an exemplary embodiment of the present invention.

Referring to FIG. 12, the infrared light flux output from the infrared light emitting element 201 located on the left side can enter the touch optical plate 120 through the polarizing element 211, It is possible to reach the polarizing element 212. HWP 830 and penetrates through the perforations 831 provided in the IR-HWP 830 and travels to the outside or the IR-HWP 830, And can proceed to the outside.

FIG. 13 is an endless touch screen structure in which an IR-QWP is applied to a medium and large-sized infrared touch screen system that reduces significant signal strength enhancement due to reinforcement of a touch signal and overlapping touch according to an embodiment of the present invention. Is a diagram showing delayed optical characteristics.

13, when the IR-QWP 630 is used as a phase retarder, the wavefront phase of the infrared light flux reaching the IR-QWP 630 is transmitted to the polarization element 211 of the infrared light- And linearly polarized in the vertical direction. When the IR-QWP 630 is transmitted, the wavefront phase of the transmitted infrared ray flux is delayed by Pi / 4 in the first polarization direction, and the infrared ray flux delayed by Pi / 4 in the upper and lower directions is transmitted to the external touch When it is reflected and transmitted again through the IR-QWP 630 and is recursively incident, the wavefront phase is again delayed by Pi / 4. Therefore, the refracted infrared ray flux 211b becomes the infrared ray flux 211b of the wavefront phase of Pi / 2 having the polarization direction corresponding to the horizontal direction perpendicular to the polarization direction of the first infrared ray flux.

Similarly, when the wavefront of the infrared light flux reaching the IR-QWP 630 is circularly polarized, the wavefront phase of the light flux transmitted through the IR-QWP 630 is delayed by Pi / 4, reflected by the external touch, In the case of recursive incidence through the QWP 630, it is finally delayed by Pi / 2 and is opposite to the initial polarization rotation direction.

On the other hand, inside the touch optical plate, a light flux 211a having a polarization property (vertical polarization) of the polarizing element 211 of the infrared light emitting element 201 and a touch light flux 211b having a phase delayed by 1/2 Coexist. However, the light flux 211b by touch has the polarization property (left-right direction polarization) orthogonal to the polarization property (vertical polarization) of the ultraviolet light emitting element 201 finally, 212, the infrared ray receiving element 202 receives only the light flux 211b generated by the touch signal.

That is, according to the present invention, the light flux 211a having the polarization characteristic (vertical polarization) of the infrared light emitting element 201 is blocked by the polarizing element 212 of the infrared light receiving element 202, 202 receive only the light flux 211b generated by the external touch, so that it is possible to detect only a significant touch light signal.

FIG. 14 is a diagram illustrating the structure of an uninterrupted touch screen to which IR-HWP is applied in a medium to large-sized infrared touch screen system for reducing significant signal strength enhancement and signal blinding due to redundant touches according to an exemplary embodiment of the present invention. Is a diagram showing delayed optical characteristics.

As shown in FIG. 14, when the IR-HWP 830 is used as a phase retarder, the change in polarization property can be explained similarly to the principle described above with reference to FIG.

Specifically, the wavefront phase of the infrared light flux reaching the IR-HWP 830 is linearly polarized in the vertical direction through the polarizing element 211 of the infrared light emitting element 201. The IR-HWP 830 reflects the infrared light flux transmitted through the perforation 831 by the external touch (finger) while the perforation 831 of the IR-HWP 830 penetrates, , The wavefront phase of the recursive incident infrared ray flux is delayed by Pi / 2 at the upper and lower sides of the initial polarization direction. Therefore, the refracted infrared ray flux 211b becomes the infrared ray flux 211b of the wavefront phase of Pi / 2 having the polarization direction corresponding to the horizontal direction perpendicular to the polarization direction of the first infrared ray flux.

In addition, when the IR light flux linearly polarized in the up-and-down direction through the polarizing element 211 of the infrared light emitting element 201 passes through the IR-HWP 830 instead of the perforation 831, the wavefront phase of the transmitted infrared light flux When an infrared light flux delayed by Pi / 2 at the upper and lower sides, which are the first polarization directions, is reflected by the external touch (finger) and transmitted through the puncture 831 of the IR-HWP 830 and recursively enters No phase delay occurs. Therefore, the refracted infrared ray flux 211b becomes the infrared ray flux 211b of the wavefront phase of Pi / 2 having the polarization direction corresponding to the horizontal direction perpendicular to the polarization direction of the first infrared ray flux.

On the other hand, inside the touch optical plate, a light flux 211a having a polarization property (vertical polarization) of the polarizing element 211 of the infrared light emitting element 201 and a touch light flux 211b having a phase delayed by 1/2 Coexist. However, the light flux 211b by touch has the polarization property (left-right direction polarization) orthogonal to the polarization property (vertical polarization) of the ultraviolet light emitting element 201 finally, 212, the infrared ray receiving element 202 receives only the light flux 211b generated by the touch signal.

That is, according to the present invention, the light flux 211a having the polarization characteristic (vertical polarization) of the infrared light emitting element 201 is blocked by the polarizing element 212 of the infrared light receiving element 202, 202 receive only the light flux 211b generated by the external touch, so that it is possible to detect only a significant touch light signal.

Meanwhile, the outer touch surfaces of the IR-QWP 630 and the IR-HWP 830, which are the infrared phase retarders described above, can be coated with a transparent film having good transmittance of visible light and infrared rays in order to prevent contamination generated from the outside .

In addition, the middle / large-sized infrared touch screen system that reduces the signal blurring due to the significant reinforcement of the touch signal and the redundant touch according to the present invention may include a separate signal processing unit. Here, the signal processing unit can convert the touch signals received from the plurality of infrared ray receiving elements located on the four outer surfaces of the touch optical plate into two-dimensional coordinates of horizontal / vertical depending on the position of the corresponding light receiving element and the received light intensity. Then, only the final meaningful touch signal can be selected by distinguishing it from the external or internal noise signal.

As a result, according to the present invention, the middle / large-sized infrared touch screen system which reduces the signal blurring due to the reinforcement of the significant touch signal and the redundant touch controls the driving of the infrared light emitting element and the infrared light receiving element included in the total internal touch screen method, And only the infrared light emitting element and the infrared light receiving element within a certain range are concentratedly driven based on the external touch to increase the characteristics of the signal generated by the external touch, Only a meaningful touch signal can be detected.

Accordingly, the foregoing detailed description should not be construed in any way as limiting and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (7)

A touch optical plate formed on an upper portion of the display unit;
A plurality of infrared light emitting elements and a plurality of infrared light receiving elements which are formed on the outer surface of the touch optical plate so as to have the same phase surface as the upper surface of the touch optical plate,
At least two IR cameras disposed outside the touch optical plate for imaging a change in the amount of infrared light reflected and refracted in response to an external touch; And
And a plurality of polarizing elements disposed in front of each of the infrared light emitting elements and each of the infrared light receiving elements,
Wherein each of the infrared light emitting elements and each of the infrared light receiving elements is disposed on an outer surface of the touch optical plate so as to intersect with each other in a linear shape and face each other on the same axis of an outer periphery of the touch optical plate,
Each of the polarizing elements is disposed such that polarization directions of the polarizing element corresponding to the infrared light emitting element and the polarizing element corresponding to the infrared light receiving element are orthogonal to each other, and the signal blurring due to the overlapping touch is reduced Medium and large infrared touch screen system.
The method according to claim 1,
Wherein each of the at least two IR cameras comprises:
A middle / large-sized infrared touch screen system that reduces meaningful touch signal reinforcement including cylinder lens of uniaxial photorefractive function and signal blurring due to overlapping touch.
The method according to claim 1,
Wherein at least two or more IR cameras
Wherein when the shape of the touch optical plate is a polygonal shape, a significant touch signal reinforcement disposed at corner portions of the polygon and a signal blurring due to overlapping touch are reduced.
The method according to claim 1,
Wherein at least two or more IR cameras
Wherein when the shape of the touch optical plate is a polygonal shape, a significant blurring of a touch signal disposed at a center of the outer surface or the outer surface of the polygon is reduced and signal blurring due to the overlapping touch is reduced.
The method according to claim 1,
Wherein at least two or more IR cameras
A touch panel for touching the touch panel, the touch panel comprising: a touch panel;
The method according to claim 1,
An image obtained by an IR camera disposed at positions orthogonal to each other among the at least two IR cameras is analyzed to divide a plurality of touch signals generated by a plurality of external touches performed on a specific line into touch signals for each touch Which reduces the signal blurring due to reinforcement of meaningful touch signals and overlapping touches.
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