KR20110007790A - An optical touch sensor using reduced number of light sources - Google Patents

Abstract

PURPOSE: An optical touch sensor is provided to divide a light source into a plurality of light sources, and detect a touch by detecting amount of a light source. CONSTITUTION: A light distributor(103) divides a light source into a plurality of light sources. A collimator(105) collimates the separated light sources. A sensor array detects the changed light amount. The light distributor comprises a bar shape transparent body(21), and a plurality of reflecting parts(102). The reflecting parts are formed on inside of the transparent body along the longitudinal direction having a fixed interval, and reflect some amount of light to a predetermined direction.

Description

Optical touch sensor with reduced number of light sources {AN OPTICAL TOUCH SENSOR USING REDUCED NUMBER OF LIGHT SOURCES}

The present invention relates to an optical sensor.

More specifically, the present invention relates to a touch sensor capable of detecting a touch by separating light emitted from one light source into a plurality of lights and detecting a change in the amount of light of the separated light. In addition, according to the embodiment of the present invention, the incident light may be incident on the substrate on which the waveguide pattern is formed, thereby increasing efficiency.

The present invention relates to a configuration for optically implementing a small or large touch screen. In particular, the present invention relates to an optical touch sensor that improves the efficiency of the light portion for sensing, increases the resolution, and increases the response speed to the touch.

Recently, as touch screen technology is widely used in mobile phones, rapid technological development is being made due to its convenience and intuition. This trend is also being used as a leading input device in devices of various sizes such as laptops, monitors, and large TVs.

Various kinds of touch screen technologies, such as constant voltage method, piezoelectric method, LED grid method, and camera method, are being applied and developed, and have advantages and disadvantages.

Currently, the constant voltage method or piezoelectric method, which is mainly used in small devices such as mobile phones, has been widely distributed with advantages such as film type, but has a slow response speed. In addition, camera and LED grids, which are widely used in large screens, have high performance in response speed, but are disadvantageous in terms of power consumption, resolution and miniaturization.

Overcoming these limitations, new ways of enabling fast responsiveness, high resolution and miniaturization are required.

An object of the present invention is to provide a touch sensor using an optical element.

It is an object of the present invention to provide a light splitter capable of producing a plurality of lights using a single light source for each axis.

An object of the present invention is to provide a miniaturized touch sensor using an optical splitter.

It is an object of the present invention to provide a touch sensor having a reduced thickness and a high reaction rate.

Touch sensor according to an embodiment of the present invention, the light source; A light splitter separating the light generated by the light source into a plurality of light rays; A collimating unit collimating the light separated by the light splitter; And a sensor array that detects a change in the amount of light of the collimated light.

Touch sensor according to an embodiment of the present invention, the light source; A light splitter separating the light generated by the light source into a plurality of light rays; A waveguide substrate configured to move the light generated by the light source; And a sensor array that detects a change in the amount of light transmitted by the waveguide substrate.

An optical splitter according to an embodiment of the present invention, the rod-shaped transparent body; And a plurality of refraction parts formed in the transparent body at predetermined intervals in a length direction and refracting a part of the light incident on the transparent body in a predetermined direction.

The optical touch sensor according to the present invention has a faster response speed than the prior art and can solve problems such as miniaturization, low power, and high resolution.

By using the present optical touch sensor according to the present invention, the light emitted from one or two light sources can be configured in an optical waveguide or an optical fiber structure to read the X-Y coordinates to detect the coordinates at high speed.

 According to the present invention, a high-resolution touch input device can be provided at low power and low cost.

In addition, when the touch sensor of the present invention is used, not only a simple input by increasing the resolution but also a complicated input such as hand writing is possible.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a configuration of a touch sensor according to an embodiment of the present invention.

As shown in FIG. 1, a touch sensor according to an embodiment of the present invention includes a light source 101, a light splitter 103 that separates light generated by the light source 101 into a plurality of lights, and the light splitter ( A collimating unit 105 for collimating the light separated by the 103, and a sensor array 107 for detecting a change in the amount of light of the collimated light.

The light source 101 may be an infrared light emitting diode or an infrared laser diode that generates infrared light. Light generated by one light source 101 is incident on the light splitter 103. The light splitter 103 separates the light incident from one light source 101 into several light and outputs the light.

Light output from the light splitter 103 travels in a straight line and enters the sensor array 107. The sensor array 107 detects the amount of light received and transmits it to the controller (not shown).

The sensor array 107 may include a plurality of sensors, and each sensor may include a photo diode, a photo resistor, a charged coupled device (CCD) sensor, or a complementary metal oxide (CMOS) sensor.

When an object, a finger, or the like enters a region through which the light output from the light splitter 103 passes, the light is blocked and the amount of light detected by the sensor array 107 is reduced. When the position of the sensor in which the amount of light is reduced in the sensor array 107 is detected, it is possible to determine the position where the object touches.

2 and 3 are a perspective view and a plan view, respectively, of a light splitter according to an embodiment of the present invention.

As shown in Figures 2 and 3, the light splitter 103 according to the present invention according to claim 1, wherein the light splitter, the transparent body 21 in the form of a rod, and the inside of the transparent body 21 It is formed at a predetermined interval in the longitudinal direction, it may be composed of a plurality of refracting portion 102 for refracting a portion of the light incident on the transparent body in a predetermined direction. The refraction portion 102 is made of a material having a refractive index different from that of the transparent body 21.

2 and 3 illustrate the case where the cross section of the transparent body 21 is a quadrangle, the cross section of the transparent body 21 does not have any shape. That is, the tube shape or the cross section may be triangular in the shape of a circle or oval in cross section.

The light generated by the light source 101 enters through the incident surface 131 of the transparent body 21, and then passes through the transparent body 21. When light travels from the transparent body 21 to the refracting portion 102, the light is passed between two media having different refractive indices, so that the light is dispersed between the media. That is, each time light passes through the refraction portion 102, some are straight ahead, but some are dispersed in other directions.

2 and 3 show only the light scattered toward the exit surface 132, but the light is dispersed in all directions as the light passes through each of the plurality of refraction portions 102 while traveling through the transparent body 21. . Therefore, even if the light generated by the light source 101 goes straight, the amount of light reaching the other end 133 of the transparent body 21 is very small.

The light emitted from the light splitter 103 is collected or collimated by the collimator 105 to be output toward the sensor array 107 of FIG. 1. The collimating part 105 of FIG. 2 is comprised by the lenticular lens array in which the some lenticular lens 106b was formed on the thin transparent substrate 106a. Other types of lenses can also be used that can collimate. The collimating unit 105 collects the light dispersed by the refraction unit 102 toward the sensor array and increases the utilization efficiency of the light.

The material of the light splitter 103 can be used as long as it is a transparent, isotropic and uniform material. For example, glass or transparent acrylic can be used.

4 shows a method of manufacturing a light distributor according to an embodiment of the present invention.

The fur pattern 23 is formed on the transparent bar 21 as shown in (a) at regular intervals as shown in (b). The furrow pattern 23 may be formed by etching, or may be formed as shown in (b) from the beginning by molding. Then, as shown in (c), the furrow pattern 23 is filled with the material of the refraction portion 102 having a refractive index different from that of the transparent rod 21. According to an embodiment, the material of the refraction portion 102 may be laminated in the state of (b), and then the surface may be flattened by polishing. The shape as shown in (c) may be used as the light splitter, or in some embodiments, the cover 24 may be additionally laminated to cover the refraction portion 102 as shown in (d). The cover 24 may be an opaque material or may be a mirror to prevent radiation of light.

5 and 6 are a perspective view and a plan view, respectively, of a light distributor according to another embodiment of the present invention.

5 and 6, the remaining components are the same as those of FIGS. 2 and 3, and the collimating unit 104 has a different shape. In the collimating unit 105 of FIGS. 5 and 6, a microlens array in which a plurality of lenses 107b is formed on the transparent substrate 107a is used.

7 is a perspective view of a light distributor according to another embodiment of the present invention.

5 and 6, but the refraction portion 104 is not a prism shape as shown in FIGS. 2 to 6, but a protrusion portion protruding into the light splitter 103. 7 shows that the protrusion is in the form of a triangular pyramid, any type of protrusion may be used as long as it is capable of constantly refracting the light generated by the light source 101.

8A and 8B illustrate a method of manufacturing a collimating unit according to an embodiment of the present invention.

As shown in FIG. 8A, the lenticular lens array 71 may be formed on the transparent substrate 70 at regular intervals, and then cut in the direction of the dotted line 72 to manufacture the collimating unit 105 of FIGS. 2 and 3. have. When forming the lenticular red array 71 on the transparent substrate 70, various methods known in the field of optical sheet manufacturing, such as molding, can be used.

As shown in FIG. 8B, the collimator part 105 of FIGS. 5 and 6 may be manufactured by forming the microlens array 73 regularly formed on the transparent substrate 70 and then cutting in the direction of the dotted line 74. Likewise, the method of forming the micro lens array 73 on the transparent substrate 70 may use various methods known in the field of optical sheet manufacturing, such as molding.

9 is a plan view of a light distributor according to another embodiment of the present invention.

In the embodiment shown in FIG. 9, a plurality of protrusions 102a and 102b different in refractive index from the transparent body 21 are formed on two opposite surfaces of the inner surface of the transparent body 21 of the light splitter 103. .

The light generated by the light source 101 is dispersed by the protrusions 102a formed on one surface and also by the protrusions 102b formed on the other surface. Some of the light scattered by the protrusions 102a and 102b goes straight, but some are output to the sensor array side as shown in FIG.

10 and 11 are plan views of light distributors using mirrors in accordance with one embodiment of the present invention.

A mirror 108 is disposed on the light source 101 and the opposite surface 133 of the light splitter 103 of FIG. 10 to reflect light passing through the light splitter 103 toward the light splitter 103 once again. The efficiency can be improved.

In addition, as shown in FIG. 11, when the mirror 110 is mounted on the opposite surface 134 of the exit surface 132 of the light splitter 103, the light emitted to the opposite surface 134 may be recycled to improve utilization efficiency of the light. It can be improved.

12 is a plan view of a light distributor according to an embodiment of the present invention.

Unlike the above-described embodiments, only the grooves or unevenness 102 is formed in the transparent body 21, and the grooves 102 are not filled with any material. In this case, since there is a difference in refractive index between the transparent body 21 and the air, the light emitted from the light source 101 also causes dispersion at the interface between the groove 102 and the air.

13 and 14 are a perspective view and a plan view of a light splitter according to an embodiment of the present invention.

As shown in FIGS. 13 and 14, the holes 114 may be formed in the transparent body 21 at regular intervals. Light passing through the light splitter 103 is dispersed through the hole 114, and part of the light is directed toward the exit surface 132 of FIGS. 13 and 14.

15 and 16 are a perspective view and a plan view of the optical splitter using the optical fiber according to an embodiment of the present invention.

As shown in FIGS. 15 and 16, half of the cladding 117 and the jacket 119 of the optical fiber are removed, and then only a portion of the core 115 exposed to the outside is masked 116 with a metal or an opaque material. The opening 118 in which the core 115 is exposed may be formed at a predetermined interval. When light is input to one end of the optical fiber thus formed, the light traveling in total reflection along the core 115 is emitted through the opening 118.

17 shows a method of manufacturing the light splitter of FIGS. 15 and 16.

As in (a), the optical fiber is composed of a core 115, a cladding 117 and a jacket 119 which is a sheath. Remove the half of the cladding 117 and the jacket 119 along the longitudinal direction of the optical fiber as shown in (b). The removing method may be polishing or grinding one side of the optical fiber. In the state as shown in (b), the light blocking material 116 is masked so that the opening 118 is formed at a predetermined interval in the portion 122 where the core 115 is exposed. The light shielding material 116 can be used as long as it is an opaque material, and according to the embodiment, a material suitable for the manufacturing process and the intended use may be used. The light shielding material 116 may be applied to the exposed portion 122 as a whole, and then only the portion of the opening 118 may be removed.

18 and 19 show perspective views of an optical splitter using optical fibers according to another embodiment of the present invention.

As shown in FIG. 18, the holes 124 may be drilled at regular intervals in the length direction of the optical fiber and used as the optical splitter. In addition, as shown in FIG. 19, the scratches 126 may be cut out at regular intervals in the longitudinal direction of the optical fiber to expose the core 115 and may be used as an optical splitter.

The various light splitters described above can be used as the light splitter 103 of FIG. 1.

According to the embodiment, when using the optical fiber as the optical splitter, an additional lens may be used to focus the light emitted from the light source 101.

20 is a view illustrating an operating principle of a touch sensor according to embodiments of the present invention.

The light generated by the light source 101 moves along the waveguide 203 while totally reflecting inside the waveguide 203. Light generated by the light source 101 is collimated while passing through the waveguide 203. The light passing through the waveguide 203 reaches the sensor 107, and the sensor 107 may detect a characteristic of the reached light, for example, an amount of light.

The waveguide 203 has a refractive index larger than that of the external medium, that is, air, and light incident on the waveguide 203 by a predetermined angle or more due to the difference in refractive index between the external medium and the waveguide 203 is absorbed in the waveguide 203. Will cause total reflection at.

At this time, when the input means 204, such as a finger or a stylus pen, comes into contact with the waveguide 203, at the contact point 205, the external medium of the waveguide 203 is a finger having a high refractive index, not instantaneously. Or it becomes a stylus pen and since air and refractive index differ, total reflection conditions will also change instantaneously. At this time, some of the light emitted from the light source 101 and moved by total reflection along the waveguide 203 is dispersed outside the waveguide 203. Therefore, since the amount of light reaching the sensor 107 is reduced than before the input means 204 is in contact, the touch of the input means 204 can be detected.

As the light source 101, a light source for generating any light may be used, but preferably, any light source for generating infrared light such as an infrared light emitting diode or an infrared laser diode may be used. As the sensor 107, any sensor that detects the amount of light may be used. Preferably, the amount of infrared light such as a photodiode, a photoresist, a charged coupled device (CCD) sensor, and a complementary metal oxide (CMOS) sensor may be detected. Any infrared sensor can be used.

21A and 21B illustrate a structure of a touch sensor according to an embodiment of the present invention.

As shown in FIG. 21A, the touch sensor may include at least one light source 101 for generating infrared rays, and a light splitter for dividing the light generated by the light source into a plurality of lights ( 103, a waveguide substrate 203 including at least one waveguide 211 for moving the separated infrared rays by total reflection, and at least one sensor for detecting a change in light generated by the waveguide 211. 205).

The light source 101 generates infrared light and inputs light into each of the waveguides 211. As the light source 101, an infrared light emitting diode or an infrared laser diode may be used.

As the light splitter 103, any of the embodiments of the light splitter described with reference to FIGS. 2 to 20 can be used.

The waveguide substrate 203 may be made of a transparent resin such as acrylic or glass, and includes a waveguide 211.

The waveguide 211 is a pattern formed in or on the waveguide substrate 203, and as shown in FIG. 21A, a plurality of patterns are formed in parallel to the horizontal axis of the waveguide substrate 203.

As described above, a photodiode, a photoresist, a CCD sensor, and a CMOS sensor capable of detecting infrared rays may be used as the sensor 205, and the sensor 205 may be a sensor array including several sensors.

Light generated by the light source 101 moves along each waveguide 211 and is detected by the sensor 205. When the user touches a portion 207 of the waveguide substrate 203, total reflection is broken at the touched portion 207, and light is emitted to the outside of the waveguide substrate 203, and the corresponding portion of the sensor 205 ( The amount of light detected at 209 is reduced. Therefore, the horizontal coordinates, i.e., the x coordinates of the portion touched by the user can be detected.

In some embodiments, a transparent substrate without the waveguide 211 may be used as the waveguide substrate 203 as shown in FIG. 21B. Even in this case, when the user touches the touch portion 207, the corresponding portion 209 of the sensor 205 may detect the touch position by detecting a change in the amount of light.

FIG. 22 is a cross-sectional view of the waveguide substrate 203 according to another embodiment of the present invention, and is a cross-sectional view of the surface of the waveguide substrate 203 of FIG. 21A taken from A-B. 23 is a perspective view of the waveguide substrate 203.

22 and 23, the waveguide substrate 203 has a transparent cover 33 formed with patterns of the waveguide 211 formed on the base substrate 31 and covering the waveguide 211 thereon. It consists of

The base substrate 31, the wave guide 211 and the cover 33 may be made of acrylic or glass as a transparent material. The waveguide 211 is made of a material having a refractive index different from that of the base substrate 31 and the cover 33. Preferably, the waveguide 211 uses a material having a relatively higher refractive index than the base substrate 31 and the cover 33. In addition, the waveguide 211 is preferably made of an isotropic uniform material.

The waveguide 211, the base substrate 31, and the cover 33 may use any transparent material such as transparent acrylic or glass.

The height of the wave guide 211 is preferably within several micrometers, and the thickness of the cover 33 is preferably within several tens of micrometers. If the thickness of the cover 33 is too thick, since the total reflection in the waveguide 211 is not broken even if the user touches, the touch cannot be detected. The threshold value of the maximum thickness of the cover 33 that can disperse the total reflection upon touch by the user can vary depending on the material and the wavelength of the light generated by the light source 101.

In some embodiments, the waveguide substrate 203 may be used without the cover 33.

24 illustrates a method of manufacturing the waveguide substrate 203 according to an embodiment of the present invention.

A groove 212 is formed in the base substrate 31 made of glass or acrylic of (a), as shown in (b). The grooves 212 may be formed by etching using photolithography.

Then, the wave guide 211 material is filled in the groove 212 as shown in (c). As described above, the waveguide 211 uses an isotropic material having a different refractive index than that of the base substrate 31, but preferably, a material having a relatively high refractive index.

In some embodiments, after laminating the waveguide 211 material, the surface may be polished to form the shape as shown in (c). Then, the cover 33 is laminated as shown in (d). The specific lamination method may vary depending on the material.

25 illustrates a touch sensor structure capable of detecting two-dimensional coordinates according to an embodiment of the present invention.

Unlike FIG. 21A, 21B or FIG. 23, waveguides for detecting x-axis and y-axis coordinates are formed perpendicular to each other on the waveguide substrate 203, and light sources 101a and 201b for detecting the x-axis and the y-axis. ) Are arranged separately. Similarly, for the sensors 205a and 205b, the x-axis coordinate detection 205a and the y-axis coordinate detection 205b are disposed separately.

FIG. 26A illustrates a perspective view of the waveguide substrate 203 of FIG. 25. A wave guide 211a for detecting the x-axis coordinate and a wave guide 211b for detecting the y-axis coordinate are vertically formed.

Light generated by the light source 101a of FIG. 25 is detected by the sensor 205a through the waveguide 211a, and light generated by the light source 101b is detected by the sensor 205b through the waveguide 211b. Is detected.

As shown in FIG. 26B, when a user touches a point 41 on the waveguide substrate 203 with a finger or a stylus pen, it corresponds to the sensor 42 and the y-axis coordinate corresponding to the x-axis coordinate of the touch point 41. The amount of light measured by the sensor 43 is reduced. The sensors 42 and 43 detect a decrease in the amount of light and transmit the reduced amount of light to a controller (not shown), and the control unit of the touch sensor can calculate a touch point.

27 illustrates a structure of a touch sensor according to another embodiment of the present invention.

Similar to the embodiment shown in FIG. 25, the sensor array 107 is concentrated in one element, and the optical signal detected at the ends of the waveguides of the waveguide substrate 203 is optical fiber or waveguides 221a and 221b. ) To the sensor array 219.

With such a configuration, it is possible to increase design freedom in a small electronic device such as a mobile phone by concentrating in one place without arranging a plurality of sensor arrays separately.

28 illustrates a touch sensor structure according to another embodiment of the present invention.

In FIG. 28, light generated by the light sources 101a and 101b disposed on the x-axis and the y-axis is collimated by the collimating units 223a and 223b and input to the waveguide substrate 203. According to the present embodiment, the utilization efficiency of the light generated by the light sources 101a and 101b by the collimating units 223a and 223b can be improved.

29A and 29B are perspective views of a collimating unit 223 according to an embodiment of the present invention.

As shown in FIG. 29A, the collimating unit 223 may include a transparent substrate 45 and a lenticular lens array 46 formed on the transparent substrate 45.

In addition, as shown in FIG. 29B, the collimating unit 223 may include a transparent substrate 45 and a microlens array 47 formed on the transparent substrate 45.

Depending on the embodiment, other known types of collimating elements may be used.

30 is a perspective view of a touch sensor according to an embodiment of the present invention shown in FIG. 28, and FIG. 31 is a plan view.

In FIGS. 30 and 31, the lenticular lens array of FIG. 29A is used as the collimating units 225a and 225b. In addition, the collimating parts 225a and 225b are integrated with the waveguide substrate 203. Of course, as shown in FIG. 28, the collimating units 225a and 225b and the waveguide substrate 203 may be separated.

Light generated by the light sources 101a and 101b is collimated by the collimating units 225a and 225b to be incident on the waveguide substrate 203 and input to the sensor arrays 205a and 205b along the waveguide. The sensor arrays 205a and 205b detect a change in the amount of light and transmit it to a controller (not shown).

When a touch occurs on the waveguide substrate 203, a change occurs in the amount of light detected by the sensor arrays 205a and 205b, and the waveguide substrate 203 is based on a change in the amount of light detected by the sensor arrays 205a and 205b. The touch position on the image may be detected.

32 is a perspective view of a touch sensor according to an embodiment of the present invention shown in FIG. 28, and FIG. 33 is a plan view.

32 and 33, the lenticular lens array of FIG. 29B is used as the collimating units 227a and 227b. Likewise, the collimating parts 225a and 225b are integrated with the waveguide substrate 203 but may be separated.

Similarly, the light generated by the light sources 101a and 101b is collimated by the collimating units 227a and 227b, is incident on the waveguide substrate 203, and is input to the sensor arrays 205a and 205b along the waveguide. do.

As shown in FIG. 30, 31 or 32, 33, a substrate in which the waveguide substrate 203 and the collimating units 225a, 225b, 227a, and 227b are integrated may be manufactured by, for example, molding.

1 illustrates a configuration of a touch sensor according to an embodiment of the present invention.

2 and 3 are a perspective view and a plan view, respectively, of a light splitter according to an embodiment of the present invention.

4 shows a method of manufacturing a light distributor according to an embodiment of the present invention.

5 to 7 are respectively a perspective view and a plan view of a light distributor according to another embodiment of the present invention.

8A and 8B illustrate a method of manufacturing a collimating unit according to an embodiment of the present invention.

9 through 16 illustrate light splitters according to an embodiment of the present invention.

17 shows a method of manufacturing the light splitter of FIGS. 15 and 16.

18 and 19 show perspective views of an optical splitter using optical fibers according to another embodiment of the present invention.

20 is a view illustrating an operating principle of a touch sensor according to embodiments of the present invention.

21A and 21B show a structure of a touch sensor according to an embodiment of the present invention.

FIG. 22 is a cross-sectional view of the waveguide substrate of FIG. 21A, and FIG. 23 is a perspective view of the waveguide substrate.

24 illustrates a method of manufacturing the waveguide substrate 203 according to an embodiment of the present invention.

25 illustrates a touch sensor structure capable of detecting two-dimensional coordinates according to an embodiment of the present invention.

26A and 26B illustrate a perspective view and an operation of the waveguide substrate of FIG. 25.

27 illustrates a structure of a touch sensor according to another embodiment of the present invention.

28 illustrates a touch sensor structure according to another embodiment of the present invention.

29A and 29B are perspective views of a collimating unit 223 according to an embodiment of the present invention.

30 and 31 are a perspective view and a plan view of a touch sensor according to an exemplary embodiment of the present invention illustrated in FIG. 28, respectively.

32 and 33 are a perspective view and a plan view of a touch sensor according to an exemplary embodiment of the present invention illustrated in FIG. 28, respectively.

Claims (32)

Light source; A light splitter separating the light generated by the light source into a plurality of light rays; A collimating unit collimating the light separated by the light splitter; And And a sensor array that detects a change in the amount of light of the collimated light. The method of claim 1, wherein the light splitter, Transparent body in the form of a rod; And And a plurality of refraction parts formed in the transparent body at predetermined intervals in a longitudinal direction and refracting a part of the light incident on the transparent body in a predetermined direction. The method of claim 2, The refractive unit is disposed on one surface of the inner surface of the transparent body, the touch sensor is a plurality of prisms different in refractive index from the transparent body. The method of claim 2, The refractive unit is disposed on one surface of the inner surface of the transparent body, the touch sensor is a plurality of protrusions different in refractive index from the transparent body. The method of claim 2, The refraction unit is a touch sensor that is a groove formed on one surface of the transparent body at predetermined intervals. The method of claim 2, The refractive unit is disposed on two opposite surfaces of the inner surface of the transparent body, the touch sensor is a plurality of protrusions different in refractive index from the transparent body. The method of claim 2, wherein the light splitter, And a mirror disposed on an opposite side of the light incident surface of the transparent body to reflect back light passing through the refraction portion. The method of claim 2, wherein the light splitter, The touch sensor further comprises a mirror disposed on the opposite side of the exit surface of the transparent body. The method of claim 2, The refraction unit is a touch sensor formed in the transparent body at a predetermined interval. The method of claim 2, The transparent body is an optical fiber, and the refraction portion is a touch sensor formed at regular intervals in the cladding and jacket (jacket) of the optical fiber. The method of claim 1, The light source is an infrared light emitting diode or an infrared laser diode. The method of claim 1, The sensor may be one of a photo diode, a photo resistor, a charged coupled device (CCD) sensor, and a complementary metal oxide (CMOS) sensor. Light source; A light splitter separating the light generated by the light source into a plurality of light rays; A waveguide substrate configured to move the light generated by the light source; And And a sensor array configured to detect a change in the amount of light transmitted by the waveguide substrate. The method of claim 13, And a collimating unit for collimating the light separated by the light splitter and transmitting the collimated light to the waveguide substrate. The method of claim 13, wherein the light splitter, Transparent body in the form of a rod; And And a plurality of refraction parts formed in the transparent body at predetermined intervals in a longitudinal direction and refracting a part of the light incident on the transparent body in a predetermined direction. The method of claim 13, The waveguide substrate includes at least one waveguide to move by total reflection. The method of claim 16, The light source is one touch sensor disposed for each wave guide. The method of claim 16, The plurality of wave guides are formed in the substrate in parallel in the transverse direction and longitudinal direction, respectively. The method of claim 13, wherein the waveguide substrate, A base substrate; A wave guide formed on the base substrate; And Touch sensor including a cover for covering the wave guide. The method of claim 13, wherein the waveguide substrate, A base substrate; And And a waveguide formed on the base substrate. The method of claim 19 or 21, The waveguide has a different refractive index than the base substrate or cover. The method of claim 13, The light source is an infrared light emitting diode or an infrared laser diode. The method of claim 13, The sensor may be one of a photo diode, a photo resistor, a charged coupled device (CCD) sensor, and a complementary metal oxide (CMOS) sensor. Transparent body in the form of a rod; And And a plurality of refraction parts formed in the transparent body at predetermined intervals in a length direction and refracting a part of the light incident on the transparent body in a predetermined direction. The method of claim 24, The refracting portion is disposed on one of the inner surface of the transparent body, the light splitter is a plurality of prisms different from the transparent body. The method of claim 24, The refracting portion is disposed on one of the inner surface of the transparent body, the light distributor is a plurality of protrusions different in refractive index from the transparent body. The method of claim 24, And the refraction portion is a groove formed on one surface of the transparent body at predetermined intervals. The method of claim 24, The refracting portion is disposed on two opposite surfaces of the inner surface of the transparent body, the light distributor is a plurality of protrusions different in refractive index from the transparent body. The method of claim 24, wherein the light splitter, And a mirror disposed opposite the light incident surface of the transparent body to re-reflect light passing through the refraction portion. The method of claim 24, And a mirror disposed opposite the exit face of the transparent body. The method of claim 24, And the refraction portion is a plurality of holes formed at regular intervals in the transparent body. The method of claim 24, And the transparent body is an optical fiber, and the refraction portion is an opening formed at regular intervals in a cladding and a jacket of the optical fiber.

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