CN102200864A - Optical touch device - Google Patents

Abstract

An optical touch device includes a transparent substrate and at least one light emitting and receiving unit. The transparent substrate is provided with a touch surface and a plurality of side surfaces. At least one side surface is a first light incident surface, and at least one side surface is a first light emergent surface opposite to the first light incident surface. The light emitting and receiving unit comprises a line light source, a light path adjusting element and a light sensing element. The line light source is configured beside the first light incident surface of the light-transmitting substrate and is suitable for providing light signals to the light-transmitting substrate. The light path adjusting element is arranged between the linear light source and the first light incident surface and is suitable for enabling the light signals to enter the light-transmitting substrate from the first light incident surface according to a preset angle. The light sensing element is arranged beside the first light-emitting surface of the light-transmitting substrate and is suitable for receiving a light signal provided by the linear light source. The optical touch device has better light utilization efficiency.

Description

Optical touch device

technical field

The present invention relates to a touch device, and in particular to an optical touch device.

Background technique

Touch devices have the advantage of easy operation, so in recent years, touch devices have been widely used in various electronic products, such as mobile phones, personal digital assistants (personal digital assistant, PDA), digital cameras, music players, computers, Satellite navigation devices, etc. Currently common touch devices include resistive touch devices, capacitive touch devices, and optical touch devices, among which the optical touch device has the advantage of lower cost.

FIG. 1 is a schematic cross-sectional view of a conventional optical touch device. Please refer to FIG. 1, the existing optical touch device 100 includes a light-transmitting substrate 110, two light sources 120 (only one is shown in FIG. 1 ) and two light sensing elements 130 (only one is shown in FIG. The substrate 110 is rectangular, and each line light source 120 corresponds to a light sensing element 130 and is respectively located on two opposite sides of the transparent substrate 110 . Each line light source 120 is disposed next to a light incident surface 112 of the light-transmitting substrate 110 , and each light-sensing element 130 is disposed beside a light-emitting surface 114 of the light-transmitting substrate 110 . In addition, a lens group 140 is disposed between each photo-sensing element 130 and the light-emitting surface 114 .

In the above optical touch device 100 , the light emitting diode 122 of the line light source 120 is used to provide the light signal 123 . The light signal 123 enters the light-transmitting substrate 110 from the light-incident surface 12 of the light-transmitting substrate 110 , and then part of the light signal 123 undergoes multiple total reflections in the light-transmitting substrate 110 and then exits from the light-emitting surface 114 . The lens group 140 is used to receive the light signals 123 and converge the light signals 123 to the light sensing element 130 . When a touch element 50 (such as a finger or a pen) touches a touch surface 116 of the light-transmitting substrate 110, the light signal 123 transmitted to the part of the touch surface 116 contacted by the touch element 50 cannot be totally reflected, so that it cannot Received by the light sensing element 130 . In this way, the position of the touch element 50 on one axial direction of the touch surface 116 can be determined according to the position of a portion of the sensing area of each light sensing element 130 that does not receive the light signal 123 . Therefore, the correct position of the touch element 50 on the touch surface 116 can be calculated with the information sensed by the two light sensing elements 130 .

In the prior art, since the incident angles of the light signal 123 from the light incident surface 112 to the light-transmitting substrate 110 are inconsistent, the light incident efficiency is poor. Moreover, part of the light signal 123 leaves the light-transmitting substrate 110 from the light-emitting surface 114 without total reflection in the light-transmitting substrate 110 , which will reduce the sensing accuracy of the light-sensing element 130 . In addition, the angle at which the light signal 123 leaves the light-transmitting substrate 110 from the light-emitting surface 114 is more divergent, resulting in poor light-collecting efficiency of the lens group 140 , so as to reduce the sensing effect of the light-sensing element 130 .

Contents of the invention

The present invention provides an optical touch device to improve light utilization efficiency by increasing the efficiency of light signals incident on a light-transmitting substrate.

The present invention further provides an optical touch device to increase light utilization efficiency by increasing the efficiency of light signals incident on the light sensing element.

The present invention provides an optical touch device, which includes a light-transmitting substrate and at least one light emitting and receiving unit. The transparent substrate has a touch surface and a plurality of side surfaces connected to the touch surface. At least one of the side surfaces is a first light incident surface, and at least one of the side surfaces is a first light exit surface opposite to the first light incident surface. Each light emitting and receiving unit includes a line light source, a light path adjusting element and a light sensing element. The line light source is arranged beside the first light incident surface of the light-transmitting substrate, and the line light source is suitable for providing light signals to the light-transmitting substrate. The light path adjustment element is disposed between the line light source and the first light incident surface, and the light path adjustment element is adapted to make the light signal provided by the line light source enter the light-transmitting substrate from the first light incident surface according to a predetermined angle. The light sensing element is arranged beside the first light emitting surface of the light-transmitting substrate, the line light source and the light-sensing element are located on opposite sides of the light-transmitting substrate, and the light-sensing element is adapted to receive the light signal provided by the line light source.

In an embodiment of the present invention, the above-mentioned linear light source includes a light guide plate, a light emitting element and a cover. The light guide plate has a second light incident surface and a second light exit surface adjacent to each other, wherein the second light exit surface is opposite to the light path adjustment element. The light-emitting element is arranged beside the second light-incident surface and is suitable for emitting infrared light signals. The cover accommodates the light guide plate and the light emitting element.

In an embodiment of the present invention, each of the above-mentioned light emitting and receiving units further includes a light collecting element disposed between the light sensing element and the first light emitting surface. The light-collecting element is suitable for receiving light signals emitted from the first light-emitting surface, and a surface of the light-collecting element away from the light-transmitting substrate is provided with a light-emitting structure, so that the light signal is transmitted to the light-sensing element through the light-emitting structure. The light output structure includes a grating structure or a matte structure.

In an embodiment of the present invention, each of the above-mentioned light emitting and receiving units further includes a lens group disposed between the light sensing element and the light collecting element, the lens group is suitable for converging the light signal to the light sensing element .

In an embodiment of the present invention, each of the above-mentioned light emitting and receiving units further includes a reflective element disposed between the light sensing element and the light collecting element. The reflective element is adapted to reflect the light signal to the light sensing element, and the reflective element of each light emitting and receiving unit includes a prism. The prism has a third light incident surface, a reflection surface and a third light exit surface. The third light incident surface is opposite to the light collecting element, the third light exit surface is opposite to the light sensing element, and the reflection surface is connected between the third light exit surface and the third light incident surface.

In an embodiment of the present invention, each of the above-mentioned light emitting and receiving units further includes a refracting element disposed between the reflecting element and the light collecting element. The refraction element is adapted to refract the optical signal to the reflective element.

In an embodiment of the present invention, each of the above-mentioned light path adjusting elements has a fourth light incident surface and a fourth light exit surface opposite to each other. The fourth light incident surface is a curved surface convex to the line light source, and the fourth light exit surface is an inclined surface.

In an embodiment of the present invention, the above-mentioned transparent substrate is a substrate of a display panel. The touch surface and a surface opposite to the touch surface are respectively provided with a reflective layer, and the reflective layer is suitable for reflecting infrared light signals.

In an embodiment of the present invention, the above-mentioned first light incident surface is an inclined surface.

In an embodiment of the present invention, the above-mentioned light sensing element has a sensing area, and the light signal provided by the line light source is totally reflected in the transparent substrate. When a touch element touches the touch surface, the touch element destroys the total reflection of part of the light signal, so that part of the sensing area of the light sensing element cannot receive the light signal.

In an embodiment of the present invention, the above-mentioned optical touch device further includes a processing unit electrically connected to the light sensing element. The processing unit is adapted to determine the position of the touch element according to the position of the part of the sensing area that does not receive the light signal.

The present invention further provides an optical touch device, which includes a light-transmitting substrate and at least one light emitting and receiving unit. The transparent substrate has a touch surface and a plurality of side surfaces connected to the touch surface. At least one of the side surfaces is a first light incident surface, and at least one of the side surfaces is a first light exit surface opposite to the first light incident surface. Each light emitting and receiving unit includes a line light source, a light sensing element and a light collecting element. The line light source is arranged beside the first light incident surface of the light-transmitting substrate, and the line light source is suitable for providing light signals to the light-transmitting substrate. The light sensing element is arranged beside the first light emitting surface of the light-transmitting substrate, and the line light source and the light-sensing element are located on opposite sides of the light-transmitting substrate. The light sensing element is suitable for receiving the light signal provided by the line light source. The light collecting element is arranged between the light sensing element and the first light emitting surface, and the light collecting element is suitable for receiving the light signal emitted from the first light emitting surface. A light output structure is provided on a surface of the light collection element away from the light-transmitting substrate, so that the light signal is transmitted to the light sensing element through the light output structure.

In an embodiment of the present invention, each of the above linear light sources includes a light guide plate, a light emitting element and a cover. The light guide plate has a second light incident surface and a second light exit surface adjacent to each other, and the second light exit surface is opposite to the light path adjustment element. The light-emitting element is arranged beside the second light-incident surface and is suitable for emitting infrared light signals. The cover accommodates the light guide plate and the light emitting element.

In an embodiment of the present invention, the above-mentioned light output structure includes a grating structure or a matte structure.

In an embodiment of the present invention, each of the above-mentioned light emitting and receiving units further includes a lens group disposed between the light sensing element and the light collecting element. The lens group is suitable for converging the light signal to the light sensing element.

In an embodiment of the present invention, each of the above-mentioned light emitting and receiving units further includes a reflective element disposed between the light sensing element and the light collecting element. The reflective element is adapted to reflect the light signal to the light sensing element, and the reflective element includes a prism. The prism has a third light incident surface, a reflection surface and a third light exit surface. The third light incident surface is opposite to the light collecting element, the third light exit surface is opposite to the light sensing element, and the reflection surface is connected between the third light exit surface and the third light incident surface.

In an embodiment of the present invention, each of the above-mentioned light emitting and receiving units further includes a refracting element disposed between the reflecting element and the light collecting element. The refraction element is adapted to refract the optical signal to the reflective element.

In an embodiment of the present invention, the above-mentioned light-transmitting substrate is a substrate of a display panel, the touch surface and a surface opposite to the touch surface are respectively provided with a reflective layer, and the reflective layer is suitable for reflecting infrared light signals.

In an embodiment of the present invention, the above-mentioned first light incident surface is an inclined surface.

In an embodiment of the present invention, the above-mentioned light sensing element has a sensing area, and the light signal provided by the line light source is totally reflected in the transparent substrate. When a touch element touches the touch surface, the touch element destroys the total reflection of part of the light signal, so that part of the sensing area of the light sensing element cannot receive the light signal.

In an embodiment of the present invention, the above-mentioned optical touch device further includes a processing unit electrically connected to the light sensing element. The processing unit is adapted to determine the position of the touch element according to the position of the part of the sensing area that does not receive the light signal.

In the optical touch device according to one embodiment of the present invention, since the optical path adjustment element is provided to make the incident angle of the light signal incident on the light-transmitting substrate relatively consistent, the efficiency of the light signal incident on the light-transmitting substrate can be increased, thereby improving light utilization. efficiency. In addition, in the optical touch device according to another embodiment of the present invention, since the light collecting element is used to collect the light signal, and the light emitting structure of the light collecting element can limit the outgoing angle and outgoing range of the light signal, it can increase the incidence of the light signal. The efficiency of the light sensing element is improved, thereby improving the light utilization efficiency.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a conventional optical touch device.

FIG. 2 is a top view of an optical touch device according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view along line I-I' of Fig. 2 .

FIG. 4 is a schematic cross-sectional view of an optical touch device according to another embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view of an optical touch device according to another embodiment of the present invention.

FIG. 6 is a schematic top view of an optical touch device according to another embodiment of the present invention.

[Description of main component symbols]

50, 60: Touch element 100: Optical touch device 110: Transparent substrate

112: Light incident surface 114: Light exit surface 116: Touch surface

120 line light source 122: LED 123: Optical signal

130: Light sensing element 140: Lens group

200, 200a, 200b, 200c: optical touch device

210, 210’: Light-transmitting substrate 212a: Touch surface

212b, 212b', 212e: the first incident surface (side)

212c, 212d: first light emitting surface (side) 212f: surface

220: Processing unit 300, 300b: Optical transmitting and receiving unit

310: Line light source 311: Optical signal 314: Light guide plate

314a: Second light incident surface 314b: Second light exit surface 316: Cover body

320: Light path adjustment element 322: The fourth light incident surface 324: The fourth light exit surface

330: light-collecting element 332: surface 333: light-emitting structure

340: Light sensing element 350: Lens group 360: Reflective element

362: The third light incident surface 364: Reflective surface 366: The third light exit surface

370: Refractive element θ: Predetermined angle

Detailed ways

FIG. 2 is a top view of an optical touch device according to an embodiment of the present invention, and FIG. 3 is a schematic cross-sectional view along line I-I' of FIG. 2 . Please refer to FIG. 2 and FIG. 3 , the optical touch device 200 of this embodiment includes a light-transmitting substrate 210 and at least one light emitting and receiving unit 300 , and FIG. 2 is an example of two light emitting and receiving units.

The light-transmitting substrate 210 has a touch surface 212a and a plurality of side surfaces (such as side surfaces 212b, 212c, 212d, 212e) connected to the touch surface 212a. At least one of these side surfaces 212b, 212c, 212d, 212e is a first light incident surface, and at least one of these side surfaces 212b, 212c, 212d, 212e is a first light exit surface opposite to the first light incident surface . More specifically, the number of first light incident surfaces and first light output surfaces corresponds to the number of light emitting and receiving units 300 . Since this embodiment takes two light emitting and receiving units 300 as an example, the numbers of the first light incident surface and the first light output surface are two respectively. In this embodiment, the side surfaces 212b and 212e are the first light incident surfaces, and the side surfaces 212c and 212d are the first light exit surfaces. Hereinafter, the side surfaces 212b and 212e will be referred to as the first light incident surfaces 212b and 212e, and also referred to as the side surfaces 212c and 212d. These are the first light-emitting surfaces 212c and 212d.

Each light emitting and receiving unit 300 includes a line light source 310 , a light path adjusting element 320 and a light sensing element 330 . The line light source 310 and the light sensing element 330 of each light emitting and receiving unit 300 are located on opposite sides of the transparent substrate 210 . In addition, the line light sources 310 are respectively disposed beside the first light incident surfaces 212 b and 212 e of the light-transmitting substrate 210 , and the line light sources 310 are suitable for providing light signals 311 to the light-transmitting substrate 210 . Each light path adjustment element 320 is disposed between the corresponding line light source 310 and the corresponding first light incident surface 212b/212e. In addition, the light path adjustment elements 320 are suitable for making the light signal 311 provided by the line light source 310 enter the light-transmitting substrate 210 from the first light-incident surfaces 212 b and 212 e at a predetermined angle θ. The light sensing elements 330 are respectively disposed beside the first light emitting surfaces 212c and 212d, and the light sensing elements 330 are adapted to receive the light signal 311 provided by the linear light source 310 .

Each of the aforementioned linear light sources 310 includes, for example, a light emitting element 312 , a light guide plate 314 and a cover 316 . Each light guide plate 314 has a second light incident surface 314a and a second light output surface 314b adjacent to each other. The second light emitting surfaces 314b of the light guide plates 314 are respectively opposite to the first light incident surfaces 212b and 212e. The light emitting element 312 is disposed beside the second light incident surface 314 a, and the cover 316 accommodates the light guide plate 314 and the light emitting element 312 . The light emitting element 312 is, for example, an infrared light emitting element, such as a light emitting diode, but not limited thereto. In addition, the light guide plates 314 are adapted to transmit part of the light signal 311 provided by the light emitting element 312 and part of the light signal 311 reflected from the cover 316 to the first light incident surfaces 212b, 212e.

In addition, each light path adjustment element 320 has, for example, a fourth light incident surface 322 and a fourth light exit surface 324 opposite to each other. The fourth light incident surface 322 is a curved surface protruding toward the line light source 310 , and the fourth light exit surface 324 is a sloped surface. The fourth light incident surface 322 is used to make the light signal 311 provided by the line light source 310 form a nearly parallel light signal 311, and the fourth light exit surface 324 is used to change the optical path of the light signal 311 so that most of the light signal 311 The light is incident on the light-transmitting substrate 210 from the first light incident surfaces 212b and 212e according to the predetermined angle θ. In other words, by changing the slope of the fourth light-emitting surface 324 , the incident angle of the light signal 311 incident on the first light-incident surface 212b, 212e can be adjusted. In addition, it should be noted that the predetermined angle θ is not limited to a single angle, and the predetermined angle θ may be within a range of a difference of several degrees between a maximum value and a minimum value.

In a general use environment, when the touch surface 212a of the transparent substrate 212 is not touched by a touch element (such as a finger), the medium in contact with the touch surface 212a is, for example, air. After the light signal 311 provided by the line light source 310 enters the light-transmitting substrate 212 from the first light-incident surface 212b, 212e, it will be totally reflected in the light-transmitting substrate 212, and will be transmitted from the first light-emitting surface 212c, 212d of the light-transmitting substrate 212 emitted to be received by the corresponding light sensing element 340 . The optical signal 311 provided by one of the two linear light sources 310 advances, for example, along a direction parallel to the X-axis, while the optical signal 311 provided by the other linear light source 310 advances, for example, along a direction parallel to the Y-axis. In addition, when the touch element 60 (such as a finger, a pen or other objects) touches the touch surface 212a, since the refractive index of the touch element 60 is different from that of air, The light signal 311 of 212 a cannot be totally reflected, so that it cannot be received by the light sensing element 340 . In other words, when the touch element 60 touches the touch surface 212 a , the touch element 60 will destroy the total reflection of part of the light signal 311 , so that part of the sensing area of the light sensing element 340 cannot receive the light signal 311 . In addition, the optical touch device 200 of this embodiment further includes a processing unit 220 . The processing unit 220 is electrically connected to the light sensing element 340 to determine the position of the touch element 60 according to the position of the part of the sensing area that does not receive the light signal 311 .

In this embodiment, the light sensing element 340 may be a complementary metal oxide semiconductor image sensor (CMOS image sensor), a charge coupled device (CCD) or other suitable light sensing elements. In addition, the photo-sensing element 340 located next to the first light-emitting surface 212c can sense the position of the touch element 60 on the X-axis, and the light-sensing element 340 located next to the first light-emitting surface 212d can sense the position of the touch element 60 on the Y-axis. s position. Therefore, the correct position of the touch element 60 on the touch surface 212 a can be sensed by the two light sensing elements 340 .

The optical touch device 200 of this embodiment uses the optical path adjustment element 320 to make the optical signal 311 incident on the light-transmitting substrate 210 at a predetermined angle θ, so the efficiency of the light signal 311 incident on the light-transmitting substrate 210 can be increased, thereby improving the performance of this embodiment. The light utilization efficiency of the optical touch device 200 of the example.

Although this embodiment takes two light emitting and receiving units 300 as an example, in another embodiment, the number of light emitting and receiving units 300 can be adjusted to one or more according to actual needs. In addition, in order to increase the reflectivity of the light signal 311 , a reflective layer (not shown) may be disposed on the touch surface 212 a and a surface 212 f opposite to the touch surface 212 a respectively. In an embodiment where the light emitting element 312 is an infrared light emitting element, each reflective layer is used to reflect an infrared light signal, for example.

It is worth mentioning that, in order to further improve the light utilization efficiency of the optical touch device 200 of this embodiment, each light emitting and receiving unit 300 may further include a light collecting element 330, which is arranged between the light sensing element 340 and the corresponding between the first light-emitting surfaces 212c/212d. Each light-collecting element 330 is adapted to receive the light signal 311 emitted from the first light-emitting surface 212c/212d, and a surface 332 of the light-collecting element 330 away from the light-transmitting substrate 210 is provided with a light-emitting structure 333, so that the light signal 311 passes through The light output structure 333 is transmitted to the light sensing element 340 . The light output structure 333 can be a grating structure or a fog structure, but not limited thereto.

Based on the above, the light collecting element 330 is adapted to receive the light signal 311 emitted from the light emitting surface 214 , and the light emitting structure 333 is adapted to limit the emitting angle and range of the light signal 311 to improve the receiving efficiency of the light sensing element 340 . In this way, the light utilization efficiency of the optical touch device 200 of this embodiment can be improved, and the sensing effect of the light sensing element 340 can be improved. In addition, a lens group 350 can be disposed between the light sensing element 340 and the light collecting element 330 of each light emitting and receiving unit 300 . The lens group 350 can converge the light signal 311 to the light sensing element 340 to further improve the sensing effect of the light sensing element 340 .

It should be noted that when the optical touch device 200 of this embodiment is applied to a touch display device, the transparent substrate 210 can be integrated with a substrate of a display panel of the touch display device. That is, the transparent substrate 210 may be a substrate of a display panel. In another embodiment, the light emitting and receiving unit of the optical touch device may also omit the light path adjusting element 320 , and only use the light collecting element 330 to improve the light utilization efficiency of the optical touch device.

FIG. 4 is a schematic cross-sectional view of an optical touch device according to another embodiment of the present invention. Referring to FIG. 4, the optical touch device 200a of this embodiment is similar to the above-mentioned optical touch device 200, the difference lies in each first light-incident surface ( For example, the first light incident surface 212b') is a slope. The slope of the slope is adapted to the optical path of the optical signal 311, so that the optical signal 311 is nearly perpendicular to the incident light surface 212b'. In this way, the efficiency of the light signal 311 entering the light-transmitting substrate 210' can be increased, so as to further improve the light utilization efficiency of the optical touch device 200a.

FIG. 5 is a schematic cross-sectional view of an optical touch device according to another embodiment of the present invention. Please refer to FIG. 5, the optical touch device 200b of this embodiment is similar to the above-mentioned optical touch device 200, the difference is that each light emitting and receiving unit 300b of the optical touch device 200b omits the lens in FIG. Group 350. In addition, each light emitting and receiving unit 300 b of the optical touch device 200 b further includes a reflective element 360 disposed between the light sensing element 340 and the light collecting element 330 . The reflective element 360 is used to reflect the light signal 311 to the light sensing element 340 . Specifically, the reflective element 360 is, for example, a prism, which has a third light incident surface 362 , a reflective surface 364 and a third light output surface 366 . The third light incident surface 362 is opposite to the light collecting element 330 , the third light exit surface 366 is opposite to the light sensing element 340 , and the reflective surface 364 is connected between the third light exit surface 366 and the third light incident surface 362 . In addition, in another embodiment, the lens group 350 in FIG. 3 may also be disposed between the reflective element 360 and the light sensing unit 340 .

FIG. 6 is a schematic top view of an optical touch device according to another embodiment of the present invention. Please refer to FIG. 6, the optical touch device 200c is similar to the above-mentioned optical touch device 200b, the difference is that each light emitting and receiving unit 300c of the optical touch device 200c further includes a refraction element 370, which is configured to reflect Between the element 360 and the light collecting element 330 , the refracting element 370 is suitable for refracting the optical signal 311 to the reflective element 360 . In addition, in another embodiment, the refraction element 370 may also contact the third light incident surface 362 of the reflection element 360 .

The above-mentioned advantages of the optical touch devices 200 b and 200 c are similar to those of the optical touch device 200 , and will not be repeated here.

In summary, the optical touch device of the present invention has at least one of the following advantages:

1. In one embodiment, since the optical touch device has an optical path adjustment element to make the incident angle of the light signal incident on the light-transmitting substrate more consistent, it can increase the efficiency of the light signal incident on the light-transmitting substrate, thereby improving the light utilization efficiency .

2. In another embodiment, since the optical touch device has a light-collecting element, and the light-emitting structure of the light-collecting element can limit the outgoing angle and outgoing range of the light signal, it can increase the efficiency of the light signal entering the light-sensing element , thereby improving the light utilization efficiency.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field of the present invention can make some changes without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the contents outlined in the claims.

Claims (21)

1. An optical touch device, characterized in that it comprises: A light-transmitting substrate has a touch surface and a plurality of sides connected to the touch surface, at least one of the sides is a first light incident surface, and at least one of the sides is connected to the first light incident surface. a first light emitting surface opposite to the light incident surface; At least one light emitting and receiving unit, each light emitting and receiving unit includes: a line light source, arranged beside the first light incident surface of the light-transmitting substrate, the line light source is suitable for providing light signals to the light-transmitting substrate; An optical path adjustment element is arranged between the line light source and the first light incident surface, and the light path adjustment element is suitable for making the optical signal provided by the line light source enter the transparent light from the first light incident surface at a predetermined angle. optical substrates; and A light sensing element is disposed beside the first light-emitting surface of the light-transmitting substrate, the line light source and the light-sensing element are located on opposite sides of the light-transmitting substrate, and the light-sensing element is suitable for receiving the line The light signal provided by the light source. 2. The optical touch device according to claim 1, wherein the line light source comprises: A light guide plate, having a second light incident surface and a second light exit surface adjacent to each other, the second light exit surface is opposite to the light path adjustment element; a light-emitting element, arranged beside the second light-incident surface, suitable for emitting infrared light signals; and A cover accommodates the light guide plate and the light emitting element. 3. The optical touch device according to claim 1, wherein each light emitting and receiving unit further comprises a light collecting element disposed between the light sensing element and the first light emitting surface, the The light-collecting element is suitable for receiving the light signal emitted from the first light-emitting surface, and a surface of the light-collecting element far away from the light-transmitting substrate is provided with a light-emitting structure, so that the light signal is transmitted to the light sensor through the light-emitting structure. The measuring element, the light output structure includes a grating structure or a matte structure. 4. The optical touch device according to claim 3, wherein each light emitting and receiving unit further comprises a lens group disposed between the light sensing element and the light collecting element, the lens group It is suitable for converging light signals to the light sensing element. 5. The optical touch device according to claim 3, wherein each light emitting and receiving unit further comprises a reflective element disposed between the light sensing element and the light collecting element, the reflective element Suitable for reflecting light signals to the light sensing element, the reflection element of each light emitting and receiving unit includes a prism, the prism has a third light incident surface, a reflection surface and a third light exit surface, the first The three light-incident surfaces are opposite to the light-collecting element, the third light-exit surface is opposite to the light-sensing element, and the reflection surface is connected between the third light-exit surface and the third light-incidence surface. 6. The optical touch device according to claim 5, wherein each light emitting and receiving unit further comprises a refraction element disposed between the reflection element and the light collection element, the refraction element is suitable for An optical signal is refracted to the reflective element. 7. The optical touch device according to claim 1, wherein each optical path adjustment element has a fourth light incident surface and a fourth light exit surface opposite to each other, and the fourth light incident surface is convex to The curved surface of the line light source, the fourth light emitting surface is an inclined surface. 8. The optical touch device according to claim 1, wherein the transparent substrate is a substrate of a display panel, the touch surface and a surface opposite to the touch surface are respectively provided with a reflective layer , and the reflective layers are suitable for reflecting infrared light signals. 9. The optical touch device as claimed in claim 1, wherein the first light incident surface is a slope. 10. The optical touch device according to claim 1, wherein the light sensing element has a sensing area, and the light signal provided by the line light source is totally reflected in the transparent substrate, when a When the touch element touches the touch surface, the touch element destroys the total reflection of part of the light signal, so that part of the sensing area of the light sensing element cannot receive the light signal. 11. The optical touch device as claimed in claim 10, further comprising a processing unit electrically connected to the light sensing element, the processing unit is adapted to detect the sensor according to the portion of the sensor that does not receive the light signal. The position of the measuring area is used to determine the position of the touch control. 12. An optical touch device, characterized in that it comprises: A light-transmitting substrate has a touch surface and a plurality of sides connected to the touch surface, at least one of the sides is a first light incident surface, and at least one of the sides is connected to the first light incident surface. a first light emitting surface opposite to the light incident surface; At least one light emitting and receiving unit, each light emitting and receiving unit includes: a line light source, arranged beside the first light incident surface of the light-transmitting substrate, the line light source is suitable for providing light signals to the light-transmitting substrate; A light sensing element is disposed beside the first light-emitting surface of the light-transmitting substrate, the line light source and the light-sensing element are located on opposite sides of the light-transmitting substrate, and the light-sensing element is suitable for receiving the line the light signal provided by the light source; and A light-collecting element is arranged between the light-sensing element and the first light-emitting surface, the light-collecting element is suitable for receiving the light signal emitted from the first light-emitting surface, and the light-collecting element is far away from the light-transmitting substrate A light output structure is provided on one surface of the surface, so that the light signal is transmitted to the light sensing element through the light output structure. 13. The optical touch device according to claim 12, wherein each line light source comprises: A light guide plate, having a second light incident surface and a second light exit surface adjacent to each other, the second light exit surface is opposite to the light path adjustment element; a light-emitting element, arranged beside the second light-incident surface, suitable for emitting infrared light signals; and A cover accommodates the light guide plate and the light emitting element. 14. The optical touch device according to claim 12, wherein the light emitting structure comprises a grating structure or a fog structure. 15. The optical touch device according to claim 12, wherein each light emitting and receiving unit further comprises a lens group disposed between the light sensing element and the light collecting element, the lens group It is suitable for converging light signals to the light sensing element. 16. The optical touch device according to claim 12, wherein each light emitting and receiving unit further comprises a reflective element disposed between the light sensing element and the light collecting element, the reflective element Suitable for reflecting light signals to the light sensing element, the reflective element includes a prism, the prism has a third light incident surface, a reflective surface and a third light exit surface, the third light incident surface and the light collecting surface The element is opposite, the third light-emitting surface is opposite to the light-sensing element, and the reflective surface is connected between the third light-emitting surface and the third light-incident surface. 17. The optical touch device according to claim 16, wherein each light emitting and receiving unit further comprises a refraction element disposed between the reflection element and the light collection element, and the refraction element is suitable for An optical signal is refracted to the reflective element. 18. The optical touch device according to claim 12, wherein the transparent substrate is a substrate of a display panel, and the touch surface and a surface opposite to the touch surface are respectively provided with a reflective layer , and the reflective layers are suitable for reflecting infrared light signals. 19. The optical touch device as claimed in claim 12, wherein the first light incident surface is an inclined surface. 20. The optical touch device according to claim 12, wherein the light sensing element has a sensing area, and the light signal provided by the line light source is totally reflected in the transparent substrate, when a When the touch element touches the touch surface, the touch element destroys the total reflection of part of the light signal, so that part of the sensing area of the light sensing element cannot receive the light signal. 21. The optical touch device as claimed in claim 20, further comprising a processing unit electrically connected to the light sensing element, the processing unit is adapted to detect the sensor according to the portion of the sensor that does not receive the light signal. The position of the measuring area is used to determine the position of the touch control.

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