TWI493414B - Liner light source module and optical touch device using the same - Google Patents

Description

Line light source module and optical touch device therewith

The present invention relates to a touch device, and more particularly to a line light source module that can be used for a touch device and an optical touch device having the line light source module.

Touch function has become one of the functions necessary for many electronic devices today, and the touch device is a common electronic component required for implementing touch functions. At present, the types of touch devices mainly include resistive, capacitive, optical, etc., and electronic devices can be matched with different types of touch devices according to different touch requirements.

FIG. 1 is a schematic structural view of a conventional optical touch device. Referring to FIG. 1 , the optical touch device 100 includes a light guiding group 110 , a light emitting component 120 , and an image detecting module 130 . The light guiding group 110 includes two light guiding strips 112a and 112b and a mirror 114. The light guiding strips 112a, 112b and the strip mirror 114 are arranged along three sides of a rectangular track, wherein the light guiding strip 112a is opposite to the strip mirror 114, and the light guiding strip 112b is connected to the light guiding strip 112a and the strip mirror 114. The area within the rectangular track is a sensing area 116. In addition, the light emitting element 120 is disposed between the adjacent ends of the light guiding strip 112a and the light guiding strip 112b, and is configured to provide light into the light guiding strip 112a and the light guiding strip 112b. The light guiding strips 112a, 112b are used to convert the light provided by the light source into linear light. The source is to illuminate the entire sensing region 116 by a linear light source. In addition, the image detecting module 130 is disposed beside the light guiding strip 112a, and the field of view (FOV) of the image detecting module 130 covers the entire sensing area 116.

In the above, the image detecting module 130 is configured to detect whether there is a shade in the sensing area 116 and calculate the position of the shade. In more detail, the touch point (ie, the shade) A in the sensing area 116 generates a mirror point A1 via the strip mirror 114, and the image detecting module 130 detects the dark points A2 and A3. Thus, the distances d1, d2 can be calculated, and the position (coordinates) of the touch point A can be calculated in conjunction with other known parameters. Other known parameters include the length of the sensing region 116 on the X axis, the width of the sensing region 116 on the Y axis, and the shortest distance from the touch point A to the strip mirror 114 equal to the mirror point A1 to the strip mirror 114. The shortest distance, etc. The detailed coordinate calculation method is a general knowledge in the art, and will not be described in detail herein.

However, the conventional optical touch device 100 has a certain blind zone 150 (Blind Zone). The blind zone 150 means that the area of the touch point coordinates cannot be accurately calculated. For example, the touch point B in the sensing area 116 is located in the blind area 150. At this time, the dark spots B2 and B3 detected by the image detector 130 may partially overlap, so that the touch cannot be accurately calculated. Point B coordinates.

2 is a schematic structural view of another conventional optical touch device. Referring to FIG. 2, the conventional optical touch device 100a is different from the conventional optical touch device 100 in that the light guiding group 110a includes two light guiding strips 112a and 112b and two strip mirrors 114a and 114b. The light guiding strips 112a, 112b are disposed adjacent to each other, and the strip mirrors 114a, 114b are also disposed adjacent to each other, and the light guiding strips 112a, 112b and the strip mirrors 114a, 114b are arranged along four sides of a rectangular track, and the rectangular tracks are arranged. The area is a sensing area 116.

Compared with the conventional optical touch device 100, although the area of the blind spot 150a of the conventional optical touch device 100a is greatly reduced, the problem of the blind spot still exists. In addition, due to the light guide of the conventional optical touch device 100a The module 110a includes two strips 114a and 114b, so that each touch point in the sensing area 116 generates three mirror images correspondingly, which causes the image detecting module 130 to detect more dark spots, which will improve Calculate the complexity of the coordinates of the touch point.

In addition, when two sensing points are simultaneously generated in the sensing area 116, six mirror images are generated correspondingly, which greatly increases the complexity of calculating the coordinates of the two touch points, so the conventional optical touch device 100a It is not conducive to dual-touch or multi-touch.

The invention provides a line light source module capable of providing a line source and a mirror function.

The invention provides an optical touch device to avoid the problem of blind spots.

The line light source module provided by the invention comprises a mirror light guiding element and a light emitting element. The mirror light guiding element has a light exit end, a surface opposite to the light exit end, and a light incident end between the light exit end and the surface, and the surface is provided with a mirror reflective material layer. The light emitting element is configured to provide light to the light incident end of the mirror light guiding element. When the light emitting element is turned on, the mirror light guiding element is a light guiding strip for converting the light provided by the light emitting element into a line light source that is emitted from the light exit end, and when the light emitting element is turned off, the mirror light guiding element is a strip mirror. Used to provide mirror function.

In an embodiment of the invention, the specular light guiding element is a solid cylinder or a hollow cylinder.

In an embodiment of the invention, the specular light guiding element is a semi-cylindrical body, and a light exit end of the specular light guiding element is a curved surface connected to the surface.

In an embodiment of the invention, the mirror light guiding element is hollow, and the light incident end and the light exit end of the mirror light guiding element are respectively open. Or a light transmissive layer.

In an embodiment of the invention, the surface of the mirror light guiding element is curved or flat.

The optical touch device provided by the present invention has a sensing area and includes the above-mentioned line light source module. The line light source module includes a mirror light guiding element and a light emitting element. The specular light guiding element has a light exit end, a surface opposite to the light exit end, and a light incident end between the light exit end and the surface. The light exit end face is opposite the sensing area, and the surface is provided with a layer of specularly reflective material. The light emitting element is configured to provide light to the light incident end of the mirror light guiding element. When the light emitting element is turned on, the mirror light guiding element is a light guiding strip for converting the light provided by the light emitting element into a line light source emerging from the light exit end. When the light emitting element is turned off, the mirror light guiding element is a strip mirror for providing a mirror function.

The line light source module of the present invention and the optical touch device having the line light source module have at least the following advantages and advantages: the line light source module of the present invention can be used not only to provide a line light source but also because of the surface of the mirror light guiding element. There is a mirror reflective material layer, so the mirror light guiding element provides a mirror function when the light emitting element is turned off. Therefore, the optical touch device having the line light source module can detect effective optical information, thereby effectively avoiding the problem of blind spots.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

100, 100a‧‧‧Knowledge optical touch device

110, 110a‧‧‧Light guide group

112a, 112b‧‧‧Light guide strips

114, 114a, 114b‧‧‧ strip mirror

116‧‧‧Sensing area

120‧‧‧Lighting elements

130‧‧‧Image Detection Module

150, 150a‧‧ ‧ blind spots

200, 200a‧‧‧ optical touch device

210‧‧‧Light guide module

212, 212'‧‧‧ first light guiding element

214, 214'‧‧‧second light guiding element

216‧‧‧3rd light guiding element

218‧‧‧fourth light guiding element

219‧‧‧Sensing area

220, 220'‧‧‧ Light source module

222‧‧‧First light-emitting element

224‧‧‧Second light-emitting element

226‧‧‧ Third light-emitting element

230‧‧‧Image Detection Module

300‧‧‧Light guide strips

311‧‧‧ first surface

312‧‧‧Light reflecting surface

313‧‧‧Light incident surface

400, 400a, 400b‧‧‧ Mirror light guiding elements

411‧‧‧Light exit end

412‧‧‧ second surface

401, 402, 403, 404‧‧‧ tablets

405, 406‧‧ ‧ light transmission layer

413‧‧‧Light incident end

511‧‧‧reflecting surface

A, B‧‧‧ touch points

A1, B1‧‧‧ mirror points

A2, A3, B2, B3, C2, C3, C5, C6, E2, F2, E4, F4, M1, M2‧‧‧ dark spots

C, G1, G3, E, F‧‧‧ shades

C1, C4, E1, F1, E3, F3‧‧‧ virtual image

D1, d2, d3, d4, d5, d6‧‧‧ distance

FIG. 1 is a schematic structural view of a conventional optical touch device.

2 is a schematic structural view of another optical touch device of the prior art.

3 is a schematic structural view of an optical touch device according to a first embodiment of the present invention.

FIG. 4 is a schematic structural view of a light guiding strip according to an embodiment of the invention.

FIG. 5 is a schematic structural view of a mirror light guiding device according to an embodiment of the invention.

6 is a schematic structural view of a mirror light guiding device according to another embodiment of the present invention.

FIG. 7 is a schematic structural view of a mirror light guiding device according to another embodiment of the present invention.

FIG. 8 is a schematic diagram of the optical touch device according to the first embodiment of the present invention when the first light emitting element is turned on and the second light emitting element is turned off.

FIG. 9 is a schematic diagram of the optical touch device according to the first embodiment of the present invention when the first light emitting element is turned off and the second light emitting element is turned on.

FIG. 10 is a schematic diagram of the optical touch device according to the first embodiment of the present invention applied to the field of dual touch and the first light emitting element is turned on and the second light emitting element is turned off.

FIG. 11 is a schematic diagram of the optical touch device according to the first embodiment of the present invention applied to the field of dual touch and the first light emitting element is turned off and the second light emitting element is turned on.

FIG. 12 is a schematic structural diagram of an optical touch device according to a second embodiment of the present invention.

3 is a schematic structural view of an optical touch device according to a first embodiment of the present invention. The optical touch device 200 of the present embodiment includes a light guiding module 210, a light source module 220, and an image detecting module 230. The light guiding module 210 includes a first light guiding element 212, a second light guiding element 214, a third light guiding element 216 and a fourth light guiding element 218 arranged along four sides of a rectangular track. A sensing region is formed between the first light guiding element 212, the second light guiding element 214, the third light guiding element 216 and the fourth light guiding element 218 Field 219. The first light guiding element 212 is opposite to the third light guiding element 216, and the second light guiding element 214 is opposite to the fourth light guiding element 218. The light source module 220 is configured to provide light to the third light guiding element 216 and the fourth light guiding element 218, and the field of view of the image detecting module 230 covers the entire sensing area 219, the third light guiding element 216 and the fourth light guiding layer. Element 218.

In this embodiment, the first light guiding element 212 and the second light guiding element 214 are respectively the light guiding strips 300 shown in FIG. 4 . The light guiding strips 300 respectively have a first surface 311, a light reflecting surface 312 opposite to the first surface 311, and a light incident surface 313 connected between the first surface 311 and the light reflecting surface 312. The first surface 311 is a light exit surface. The light emitted by the light source module 220 enters the light guiding strip 300 via the light incident surface 313, is reflected by the light reflecting surface 312, and is emitted by the first surface 311 (light emitting surface). Referring to FIG. 3, in the embodiment in which the light guiding strip 300 is used as the first light guiding element 212 and the second light guiding element 214, the first light guiding element 212 and the first surface 311 of the second light guiding element 214 are faced. For the sensing area 219. The light source module 220 is adapted to provide light to the light incident surface 313 of the first light guiding element 212 and the second light guiding element 214, and the light reflecting surface 312 of the first light guiding element 212 and the second light guiding element 214 is adapted to light It is reflected to the first surface 311 and is emitted by the first surface 311 to the sensing region 219.

The third light guiding element 216 and the fourth light guiding element 218 are, for example, mirror surface light guiding elements 400 shown in FIG. 5, respectively. The mirror light guiding element 400 has a light emitting end 411, a second surface 412 opposite to the light emitting end 411, and a light incident end 413 between the light emitting end 411 and the second surface 412, and the second surface 412 is provided. There is a mirror reflective material layer. When light enters the mirror light guiding element 400 from the light incident end 413, the mirror reflective material layer disposed on the second surface 412 reflects the light, and the light is emitted from the light exit end 411. When no light enters the specular light guiding element 400 from the light incident end 413, the specularly reflective material layer provided on the second surface 412 can provide a mirror function.

In this embodiment, the mirror light guiding element 400 is, for example, a semicircular solid. Column. The light exit end 411 of the mirror light guiding element 400 is a curved surface connected to the second surface 412, and the second surface 412 is, for example, a flat surface. Of course, the mirror light guiding element 400 can also be a semicircular hollow cylinder. In addition, the shape of the mirror light guiding member 400 is not limited to the above-described semi-cylindrical body, and may be a solid or hollow cylinder of other suitable shapes, and the second surface 412 may be designed as a curved surface as needed. Referring to FIG. 3 , in the embodiment where the third light guiding element 216 and the fourth light guiding element 218 are the mirror light guiding elements 400 , the light emitting ends 411 of the third light guiding element 216 and the fourth light guiding element 218 . Facing the sensing region 219, the light source module 220 is adapted to provide light to the light incident ends 413 of the third light guiding element 216 and the fourth light guiding element 218.

6 is a schematic structural view of a mirror light guiding device according to another embodiment of the present invention. Referring to FIG. 6, the mirror light guiding element 400a has a function similar to that of the mirror light guiding element 400 described above, and the difference lies in the shape. Specifically, the mirror light guiding element 400a of the present embodiment has a hollow shape, and the mirror light guiding element 400a is connected by a flat plate 401, 402, 403, 404, and the light incident end 413 of the mirror light guiding element 400a is light. The exit ends 411 are each an opening. The second surface 412 is opposite the light exit end 411 and the second surface 412 is provided with a layer of specularly reflective material. Referring to FIG. 3, in the embodiment in which the light guiding strip 400a is used as the third light guiding element 216 and the fourth light guiding element 218, the light exit end 411 faces the sensing area 219. The light source module 220 is adapted to provide light to the light incident ends 413 of the third light guiding element 216 and the fourth light guiding element 218.

FIG. 7 is a schematic structural view of a mirror light guiding device according to another embodiment of the present invention. Referring to FIG. 7, the mirror light guiding element 400b is similar to the mirror light guiding element 400a described above, except that the light incident end 413 and the light exit end 411 are respectively a light transmitting layer. Specifically, the mirror light guiding element 400b of the present embodiment has a hollow shape, and the mirror light guiding element 400a is formed by connecting the flat plates 401, 402, 403, and 404 and the light transmitting layers 405 and 406, and the mirror light guiding element 400a is formed. The light incident end 413 is a light transmissive layer 405, and the light exit end 411 is a light transmissive layer 406. Such as Therefore, with reference to FIG. 3 , in the embodiment in which the light guiding strip 400 b is used as the third light guiding element 216 and the fourth light guiding element 218 , the light exit end 411 faces the sensing area 219 . The light source module 220 is adapted to provide light to the light incident ends 413 of the third light guiding element 216 and the fourth light guiding element 218. The light transmissive layers 405 and 406 are adapted to allow the light provided by the light source module 220 to smoothly enter the light incident end 413 and exit the light exit end 411 to the sensing region 219. The material of the light transmissive layers 405 and 406 may be a light transmissive material such as a plastic film or glass.

Referring to FIG. 3 again, the light source module 220 includes a first light emitting element 222 and a second light emitting element 224 . In this embodiment, the first light-emitting element 222 is disposed between the second ends of the second light guiding element 214 and the third light guiding element 216, for example. The first light-emitting element 222 and the third light-guiding element 216 may constitute a so-called line source module, and the second light-emitting element 224 and the fourth light-guitar element 218 may constitute another line source module. The first illuminating element 222 is configured to provide light to the light incident end 413 of the third light guiding element 216 and to provide light to the light incident surface 313 of the second light guiding element 214. The second light emitting element 224 is disposed between the fourth light guiding element 218 and the adjacent ends of the first light guiding element 212. The second illuminating element 224 is configured to provide light to the light incident end 413 of the fourth light guiding element 218 and to provide light to the light incident surface 313 of the first light guiding element 212. In other embodiments, light may be supplied to the first light guiding element 212 and the second light guiding element 214 by other light emitting elements instead of providing light to the first light by the first light emitting element 222 and the second light emitting element 224. The light element 212 and the second light guiding element 214.

The first light-emitting element 222 and the second light-emitting element 224 described above are adapted to alternately emit light. When the first illuminating element 222 is turned on and the second illuminating element 224 is turned off, the first illuminating element 222 provides light to the third light guiding element 216, and the third light guiding element 216 converts the light into a sensing region 219. Linear light source. At the same time, the fourth light guiding element 218 is used to provide a mirror function because the second light emitting element 224 is turned off. Conversely, when the first light-emitting element 222 is turned off, and When the second light-emitting element 224 is turned on, the second light-emitting element 224 provides light to the fourth light-guiding element 218, and the fourth light-guitar element 218 converts the light into a linear light source that is transmitted to the sensing region 219. At the same time, the third light guiding element 216 is used to provide a mirror function because the first light emitting element 222 is turned off.

The image detecting module 230 is disposed between adjacent first ends of the first light guiding element 212 and the second light guiding element 214. The field of view of the image detecting module 230 covers the sensing area 219, the third light guiding element 216 and the fourth light guiding element 218. Therefore, the image detecting module 230 can effectively detect the optical information in the sensing area 219 and the optical information of the blackout image formed by the third light guiding element 216 or the fourth light guiding element 218, so as to accurately sense the position. The position (coordinate) of the shade in the area 219 is measured.

In addition, the optical touch device 200 can further include a substrate (not shown), and the light guide module 210 and the light source module 220 can be disposed on the substrate.

A positioning method of an optical touch device suitable for the optical touch device 200 described above will be specifically described below.

The positioning method of the optical touch device for the optical touch device 200 described above includes the following steps: controlling the first light-emitting element 222 and the second light-emitting element 224 of the optical touch device 200 to alternately emit light. When the first illuminating element 222 is turned on and the second illuminating element 224 is turned off, the image detecting module detects 230 to detect a first optical information. When the first illuminating element 222 is turned off and the second illuminating element 224 is turned on, the image detecting module 230 detects a second optical information; and the first optical information detected by the image detecting module 230 and the first The second optical information determines the position of the shade located in the sensing area 219.

Specifically, referring to FIG. 8, when the first light-emitting element 222 is turned on and the second light-emitting element 224 is turned off, the fourth light-guiding element 218 provides a mirror function, so that the shade C located in the sensing region 219 will form a virtual image. C1, and the image detecting module 230 can detect the first about the shade C and the virtual image C1 An optical information (such as dark spots C2, C3). Thus, the distances d3, d4 can be calculated, and the position (coordinates) of the shade C can be calculated in conjunction with other known parameters. Other known parameters include the length of the sensing region 219 on the X-axis, the width of the sensing region 219 on the Y-axis, and the shortest distance from the shade C to the fourth light guiding member 218 being equal to the virtual image C1 to the fourth light guiding element. The shortest distance of 218, etc. The detailed coordinate calculation method is a general knowledge in the art, and will not be described in detail herein.

In addition, referring to FIG. 9, when the first light-emitting element 222 is turned off and the second light-emitting element 224 is turned on, the third light-guiding element 216 provides a mirror function, so the shade C located in the sensing region 219 will form a virtual image C4. The image detection module 230 can detect the second optical information about the shade C and the virtual image C4 (such as dark spots C5, C6). Thus, the distances d5, d6 can be calculated, and the position (coordinate) of the shade C can be calculated in conjunction with other known parameters.

Then, the position of the shade C located in the sensing area 219 can be determined according to the first optical information and the second optical information detected by the image detecting module 230. In general, the correct position (coordinate) of the shade C can be calculated from the first optical information and the second optical information, respectively.

However, as previously mentioned, when the optical touch device has only one mirror assembly, there is a dead zone. In the optical touch device 200 of the present embodiment, when the first light-emitting element 222 is turned on and the second light-emitting element 224 is turned off, if the light-shielding region of the sensing region 219 is located in the blind region, the first optical light that is effectively available may not be obtained. News. However, when the first illuminating element 222 is turned off and the second illuminating element 224 is turned on, the shading of the sensing region 219 will not be located in the blind spot, so that the second optical information that is effectively available can be obtained, and thus the second optical information can be obtained. The correct position (coordinate) of the shade in the sensing region 219 is calculated. vice versa. In other words, the blind area of the optical touch device 200 in the state of FIG. 8 is different from the blind area of the optical touch device 200 in the state of FIG. 9, when one of the first optical information and the second optical information is invalid, another Optical information to calculate the correct position of the shade. Therefore, the optical touch device 200 and the positioning method thereof of the embodiment can effectively solve the problem of the blind zone.

It is worth mentioning that the optical touch device 200 and the positioning method thereof are advantageously applied in the field of dual touch or multi-touch. The following description will be made by taking a two-touch as an example.

The positioning method of the optical touch device 200 when applied to the two-touch is similar to the positioning method when the single touch is applied. The following description is only for the case when ghosting occurs. 10 and 11 are schematic diagrams of the optical touch device 200 described above applied to two-touch.

Referring first to FIG. 10, when the first light-emitting element 222 is turned on and the second light-emitting element 224 is turned off, the fourth light-guiding element 218 provides a mirror function, so that the shades E, F located in the sensing region 219 will form a virtual image E1. F1, and the image detecting module 230 can detect the first optical information (such as dark spots M1, E2, F2) about the shades E, F and the virtual images E1, E2. Since the dark point M1 is formed by overlapping two points, the position of the three shades E, F, and G1 is calculated by the first optical information, wherein the shade G1 is a so-called ghost image, which is not real. Therefore, it is impossible to determine the correct position of the shades E and F.

Referring to FIG. 11, when the first light-emitting element 222 is turned off and the second light-emitting element 224 is turned on, the third light-guiding element 216 provides a mirror function, so the shades E and F located in the sensing region 219 will form virtual images E3 and F3. The image detection module 230 can detect the first optical information (such as dark spots M2, E4, F4) about the shades E, F and the virtual images E3, F3. Since the dark point M2 is formed by overlapping two points, the position of the three shades E, F, and G3 is calculated by the second optical information, wherein the shade G3 is a so-called ghost, which is not real. Since the possible positions calculated by the first optical information and the possible positions calculated by the second optical information include the positions of the shades E and F, the positions of the shades G1 and G3 can be excluded, thereby determining the correctness of the shades E and F. position.

Optical touch device 200 of the embodiment and positioning method thereof A design is adopted to alternately emit the first light-emitting element 222 and the second light-emitting element 224 to obtain first optical information and second optical information. The method for calculating the correct position of the light shield by using the first optical information and the second optical information is relatively simple. Therefore, the optical touch device 200 and the positioning method thereof are advantageously applied in the field of dual touch or multiple points. Touch field.

FIG. 12 is a schematic structural diagram of an optical touch device according to a second embodiment of the present invention. Referring to FIG. 12, the optical touch device 200a of the present embodiment is different from the optical touch device 200 in that the first light guiding element 212' and the second light guiding element 214' are respectively a reflective strip. The reflective strip has a reflective surface 511, and in the embodiment in which the reflective strip is the first light guiding element 212' and the second light guiding element 214', the first light guiding element 212' and the second light guiding element 214' The first surface is a reflective surface 511. The light source module 220' further includes a third light emitting element 226 disposed between adjacent ends of the first light guiding element 212' and the second light guiding element 214' to provide light to the sensing area 219. When the optical touch device 200a is turned on, the third light-emitting element 226 continues to emit light, and the first light-guiding element 212' and the second light-guiding element 214' are used to transmit light to the first surface (ie, the reflective surface 511). Reflected to the sensing region 219. In addition, the first light-emitting element 222 of the optical touch device 200a of the present embodiment is only used to provide light to the third light-guiding element 216, for example, and the second light-emitting element 224 is only used to provide light to the fourth light-guiding element. 218.

The advantages of the optical touch device 200a of the present embodiment are similar to those of the optical touch device 200 described above, and will not be repeated here.

In summary, the present invention has at least the following advantages:

1. In the present invention, since the first light-emitting element emits light and the second light-emitting element emits light, the optical touch device has different dead zones. When one of the first optical information and the second optical information is invalid, the correct position of the shade can be calculated by another optical information. Therefore, the optical touch device and the positioning method thereof of the present invention can effectively solve the problem of the blind spot.

2. When the optical touch device and the positioning method thereof are applied to the field of dual touch or multi-touch, the first optical information and the second optical information detected by the image detecting module include There is less data (ie fewer dark spots), so the complexity of calculating the correct position of the shading can be reduced. Therefore, the optical touch device and the positioning method thereof are advantageously applied in the field of dual touch or multi-touch.

3. The line light source module of the present invention can provide a mirror light guiding element when the light emitting element is closed, except that the line light source module can be used to provide a line light source, since the surface of the mirror light guiding element (ie, the second surface) is provided with a mirror reflective material layer. Mirror function.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

200‧‧‧Optical touch device

210‧‧‧Light guide module

212‧‧‧First light guiding element

214‧‧‧Second light guiding element

216‧‧‧3rd light guiding element

218‧‧‧fourth light guiding element

219‧‧‧Sensing area

220‧‧‧Light source module

222‧‧‧First light-emitting element

224‧‧‧Second light-emitting element

230‧‧‧Image Detection Module

Claims (10)

A line light source module includes: a mirror light guiding element having a light emitting end, a surface opposite to the light emitting end, and a light incident end between the light emitting end and the surface, and the surface is provided a light-reflecting material layer; and a light-emitting element for providing light to the light incident end of the mirror light-guiding element; wherein when the light-emitting element is turned on, the mirror light-guiding element is a light guide strip for The light provided by the illuminating element is converted into a line of light source emerging from the light exit end, and when the illuminating element is turned off, the specular light guiding element is a strip mirror for providing a mirror function. The line light source module of claim 1, wherein the mirror light guiding element is a solid cylinder or a hollow cylinder. The line light source module of claim 1, wherein the mirror light guiding element is a semi-cylindrical body, and the light exit end of the mirror light guiding element is a curved surface connected to the surface. The line light source module of claim 1, wherein the mirror light guiding element is hollow, and the light incident end of the mirror light guiding element and the light emitting end are respectively an opening or a light transmitting layer. The line light source module of claim 1, wherein the surface of the mirror light guiding element is curved or flat. An optical touch device having a sensing area, the optical touch device The method includes a first-line light source module, including: a mirror light guiding component having a light emitting end, a surface opposite to the light emitting end, and a light incident end between the light emitting end and the surface, the light exiting An end surface of the sensing area, wherein the surface is provided with a mirror reflective material layer; and a light emitting element for providing light to the light incident end of the mirror light guiding element; wherein the mirror surface is opened when the light emitting element is turned on The light guiding element is a light guiding strip for converting the light provided by the light emitting element into a line light source emerging from the light emitting end, and when the light emitting element is turned off, the mirror light guiding element is a strip mirror for providing Mirror function. The optical touch device of claim 6, wherein the specular light guiding element is a solid cylinder or a hollow cylinder. The optical touch device of claim 6, wherein the mirror light guiding element is a semi-cylindrical body, and the light exit end of the mirror light guiding element is a curved surface connected to the surface. The optical touch device of claim 6, wherein the specular light guiding element is hollow, and the light incident end of the specular light guiding element and the light emitting end are respectively an opening or a light transmitting layer. The optical touch device of claim 6, wherein the surface of the mirror light guiding element is curved or planar.