CN102043540B - Optical touch device and positioning method for the optical touch device - Google Patents

Abstract

The invention relates to an optical touch device and a positioning method thereof. The light guide module comprises a first light guide element, a second light guide element, a third light guide element and a fourth light guide element which are arranged along four sides of a rectangular track. The light guide module forms a sensing area. The third and fourth light guide elements are mirror light guide elements, respectively. The light source module comprises a first light-emitting element and a second light-emitting element which are suitable for alternately emitting light. The image detection module is arranged between two adjacent ends of the first light guide element and the second light guide element, and the visual field of the image detection module covers the sensing area, the third light guide element and the fourth light guide element. The optical touch device can avoid the problem of blind areas and has the advantage of multipoint positioning. The invention further provides a positioning method of the optical touch device.

Description

Optical touch device and positioning method for the optical touch device

technical field

The present invention relates to a touch device, in particular to an optical touch device and a positioning method for the optical touch device.

Background technique

The touch function has become one of the necessary functions of many electronic devices nowadays, and the touch device is a common electronic component required to realize the touch function. Currently, types of touch devices mainly include resistive, capacitive, optical, etc., and electronic devices can be equipped with different types of touch devices according to different touch requirements.

Please refer to FIG. 1 , which is a schematic structural diagram of a conventional optical touch device. The conventional optical touch device 100 includes a light guide group 110 , a light emitting element 120 and an image detection module 130 . Wherein, the light guide group 110 includes two light guide strips 112 a , 112 b and a mirror 114 . The light guide strips 112a, 112b and the strip mirror 114 are arranged along three sides of a rectangular track, wherein the light guide strip 112a is opposite to the strip mirror 114, and the light guide strip 112b is connected between the light guide strip 112a and the strip mirror 114 , and the area within the above-mentioned rectangular track is a sensing area 116 . In addition, the light emitting element 120 is disposed between adjacent ends of the light guide bar 112a and the light guide bar 112b, and is used to provide light into the light guide bar 112a and the light guide bar 112b. The light guide strips 112a, 112b are used to convert the light provided by the light source into a linear light source, so that the entire sensing area 116 is irradiated by the linear light source. In addition, the image detection module 130 is disposed beside the light guide bar 112a, and the field of view (Field of View, FOV) of the image detection module 130 covers the entire sensing region 116 .

Based on the above, the image detection module 130 is used to detect whether there is a shading object in the sensing area 116 and calculate the position of the shading object. In more detail, the touch point (ie, the shade) A in the sensing area 116 generates a mirror image point A1 through the strip mirror 114 , and the image detection module 130 detects the dark points A2 and A3 . In this way, the distances d1 and d2 can be calculated, and the position (coordinates) of the touch point A can be calculated in conjunction with other known parameters. The other known parameters mentioned above include the length of the sensing area 116 on the X-axis, the width of the sensing area 116 on the Y-axis, and the shortest distance between the touch point A and the strip mirror 114 is equal to the distance between the mirror point A1 and the strip mirror 114. shortest distance etc. The detailed coordinate calculation method is common knowledge in the technical field, and will not be described in detail here.

However, the conventional optical touch device 100 has a certain blind zone 150 (BlindZone). The blind area 150 means the area where the coordinates of the touch points cannot be accurately calculated. For example, the touch point B in the sensing area 116 is just located in the blind area 150, at this time, the dark points B2 and B3 detected by the image detector 130 will partially overlap, so it will not be possible to accurately calculate the touch point B. The coordinates of point B.

Please refer to FIG. 2 , which is a schematic structural diagram of another conventional optical touch device. The difference between the conventional optical touch device 100a and the conventional optical touch device 100 is that the light guide group 110a includes two light guide strips 112a, 112b and two strip mirrors 114a, 114b. The light guide strips 112a, 112b are arranged adjacently, and the strip mirrors 114a, 114b are also adjacently arranged, and the light guide strips 112a, 112b and the strip mirrors 114a, 114b are arranged along four sides of a rectangular track, and within the rectangular track The area of is a sensing area 116 .

Compared with the conventional optical touch device 100, although the area of the blind area 150a of the conventional optical touch device 100a is greatly reduced, the problem of the blind area still exists. In addition, since the light guide module 110a of the conventional optical touch device 100a includes two strip mirrors 114a, 114b, each touch point located in the sensing area 116 will generate three mirror images correspondingly, resulting in image detection. The detection module 130 detects more dark points, which will increase the complexity of calculating the coordinates of the touch points.

In addition, when two touch points appear in the sensing area 116 at the same time, six mirror images will be generated correspondingly, which will greatly increase the complexity of calculating the coordinates of the two touch points. The control device 100a is not conducive to realizing dual-touch or multi-touch.

It can be seen that the above-mentioned existing optical touch device obviously still has inconveniences and defects in structure and use, and needs to be further improved. In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general products do not have a suitable structure to solve the above-mentioned problems. This is obviously the relevant industry. urgent problem to be solved. Therefore, how to create a new type of optical touch device and its positioning method and line light source module is one of the current important research and development topics, and it has also become a goal that the industry needs to improve.

Contents of the invention

The main purpose of the present invention is to overcome the defects existing in the existing optical touch device, and provide a new type of optical touch device. The technical problem to be solved is to avoid the problem of blind spots, which is very suitable for practical use.

Another object of the present invention is to provide a novel positioning method for an optical touch device. The technical problem to be solved is to make it effectively solve the problem of blind spots, so that it is more suitable for practical use.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions. An optical touch device according to the present invention includes: a light guide module, including a first light guide element, a second light guide element, and a third light guide element arranged along four sides of a rectangular track and a fourth light guide element, a sensing area is formed between the first light guide element, the second light guide element, the third light guide element and the fourth light guide element, the first light guide element and the fourth light guide element The third light guide element is opposite, the second light guide element is opposite to the fourth light guide element, the first light guide element and the second light guide element respectively have a first surface facing the sensing area, The third light guide element and the fourth light guide element are respectively a specular light guide element, and each specular light guide element has a light emitting end facing the sensing region, and a second light emitting end opposite to the light emitting end. surface and a light incident end between the light exit end and the second surface, and the second surface is provided with a specular reflective material layer; a light source module, including: a first light-emitting element for providing light to the The light incident end of the third light guide element; a second light emitting element, used to provide light to the light incident end of the fourth light guide element, wherein the first light emitting element and the second light emitting element are suitable for alternately emitting light , and the first surfaces of the first light guide element and the second light guide element are suitable for guiding light to the sensing area; and an image detection module is arranged on the first light guide element and the second light guide element Between adjacent ends of the two light guide elements, the field of view of the image detection module covers the sensing area, the third light guide element and the fourth light guide element.

The purpose of the present invention and its technical problems can also be further realized by adopting the following technical measures.

The aforementioned optical touch device, wherein the first light guide element and the second light guide element are respectively a light guide strip, and the light guide strip further has a reflective surface opposite to the first surface and a The light incident surface between the first surface and the reflective surface, and the first surface is a light exit surface, and the light source module is more suitable for providing light to the first light guide element and the second light guide element. some light incident surfaces.

The aforementioned optical touch device, wherein the first light-emitting element is disposed between adjacent ends of the second light-guiding element and the third light-guiding element, and the first light-emitting element is further used to provide light to the second light-guiding element The light incident surface of the second light guide element, the second light emitting element is arranged between the adjacent two ends of the fourth light guide element and the first light guide element, and the second light emitting element is further used to provide light to the first light guide element The light incident surface of a light guide element.

The aforementioned optical touch device, wherein the first light guide element and the second light guide element are respectively a reflective strip, the first surface of the reflective strip is a reflective surface, and the light source module further includes a third light emitting element , arranged between the adjacent ends of the first light guide element and the second light guide element to provide light to the sensing area, and the reflective strips are used to reflect the light transmitted to the first surfaces to the sensing area.

In the aforementioned optical touch device, the third light-emitting element is a light-emitting diode.

The aforementioned optical touch device, wherein the specular light guide element is a solid cylinder or a hollow cylinder.

In the aforementioned optical touch device, the specular light guide element is a semi-cylindrical body, and the light emitting end of the specular light guide element is a curved surface connected to the second surface.

In the aforementioned optical touch device, the mirror light guide element is hollow, and the light incident end and the light output end of the mirror light guide element are respectively an opening or a light-transmitting layer.

In the aforementioned optical touch device, the second surface of the specular light guide element is a curved surface or a plane.

The aforementioned optical touch device further includes a substrate, and the light guide module and the light source module are disposed on the substrate.

In the aforementioned optical touch device, the first light-emitting element and the second light-emitting element are both light-emitting diodes.

The purpose of the present invention and the solution to its technical problem also adopt the following technical solutions to achieve. According to the positioning method of the optical touch device proposed in the present invention, it is suitable for the optical touch device described in claim 1, and the positioning method of the optical touch device includes: controlling the light source module of the optical touch device The first light-emitting element and the second light-emitting element emit light alternately, when the first light-emitting element is turned on and the second light-emitting element is turned off, the image detection module detects a first optical information, and when the first light-emitting element is turned off When the second light-emitting element is turned on, the image detection module detects a second optical information; and according to the first optical information and the second optical information detected by the image detection module, it is determined that the position of the shading object within the measurement area.

Compared with the prior art, the present invention has obvious advantages and beneficial effects. With the above technical solution, the optical touch device and the positioning method thereof of the present invention have at least the following advantages and beneficial effects: In the optical touch device of the present invention, the third light guide element and the fourth light guide element of the light guide module The light guide element is a specular light guide element, and the first light emitting element and the second light emitting element are adapted to emit light alternately. When the third light guiding element provides the mirror function, the fourth light guiding element provides the light guiding function, and when the fourth light guiding element provides the mirror function, the third light guiding element provides the light guiding function. In this way, the image detection module can detect effective and available optical information, thereby effectively avoiding the problem of blind spots. In addition, the positioning method of the optical touch device of the present invention utilizes the first light-emitting element and the second light-emitting element of the light-emitting module to emit light alternately, so that the image detection module can detect the effective and available first optical information and second optical information In this way, the position of the shading object located in the sensing area can be calculated by using the first optical information and the second optical information, so as to solve the problem of the blind area.

To sum up, the optical touch device of the present invention can avoid the problem of blind spots, and has the advantage of multi-point positioning. The invention also provides a positioning method for the optical touch device. The present invention has significant progress in technology, and has obvious positive effects, and is a novel, progressive and practical new design.

The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and understandable , the following preferred embodiments are specifically cited, and in conjunction with the accompanying drawings, the detailed description is as follows.

Description of drawings

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

FIG. 2 is a schematic structural diagram of another conventional optical touch device.

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

FIG. 4 is a schematic structural diagram of a light guide strip according to an embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a specular light guide element according to an embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a specular light guide element according to another embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a specular light guide element 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.

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 when the optical touch device according to the first embodiment of the present invention is 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 when it is 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.

100, 100a: existing known optical touch devices

110, 110a: light guide group 112a, 112b: light guide strip

114, 114a, 114b: strip mirror 116: sensing area

120: Light-emitting element 130: Image detection module

150, 150a: blind area 200, 200a: optical touch device

210: Light guide module 212: First light guide element

214: The second light guide element 216: The third light guide element

218: The fourth light guide element 219: Sensing area

220: Light source module 222: The first light emitting element

224: The second light-emitting element 226: The third light-emitting element

230: Image detection module 300: Light guide strip

311: first surface 312: light reflection surface

313: Light incident surface 400, 400a, 400b: Mirror light guide element

411: light exit end 412: second surface

401, 402, 403, 404: flat plate 405, 406: light-transmitting layer

413: light incident end

511: reflective surface

Detailed ways

In order to further explain the technical means and effects of the present invention to achieve the intended purpose of the invention, the optical touch device according to the present invention and its positioning method and line The specific implementation, structure, features and functions of the light source module are described in detail below.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the drawings. Through the description of specific embodiments, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are only for reference and description, and are not used to explain the present invention. be restricted.

Please refer to FIG. 3 , which is a schematic structural diagram of an optical touch device according to a first embodiment of the present invention. The optical touch device 200 of this embodiment includes a light guide module 210 , a light source module 220 and an image detection module 230 . The light guide module 210 includes a first light guide element 212 , a second light guide element 214 , a third light guide element 216 and a fourth light guide element 218 arranged along four sides of a rectangular track. A sensing area 219 is formed among the first light guide element 212 , the second light guide element 214 , the third light guide element 216 and the fourth light guide element 218 . 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 used to provide light to the third light guide element 216 and the fourth light guide element 218 , and the field of view of the image detection module 230 covers the entire sensing area 219 , the third light guide element 216 and the fourth light guide element 218 .

In this embodiment, the first light guide element 212 and the second light guide element 214 are, for example, the light guide strips 300 shown in FIG. 4 . The light guide strip 300 respectively has a first surface 311 , a light reflective surface 312 opposite to the first surface 311 , and a light incident surface 313 connected between the first surface 311 and the light reflective surface 312 . The first surface 311 is a light emitting surface. The light emitted by the light source module 220 enters the light guide bar 300 through the light incident surface 313 , is reflected by the light reflecting surface 312 and then exits from the first surface 311 (light emitting surface). Please refer to FIG. 3 , in the embodiment where the light guide strip 300 is used as the first light guide element 212 and the second light guide element 214 , the first surface 311 of the first light guide element 212 and the second light guide element 214 to the sensing region 219 . The light source module 220 is adapted to provide light to the light incident surface 313 of the first light guide element 212 and the second light guide element 214, and the light reflection surface 312 of the first light guide element 212 and the second light guide element 214 is adapted to reflect the light to the first surface 311 and emitted from 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, the mirror light guiding element 400 shown in FIG. 5 . The mirror light guide element 400 has a light exit end 411, a second surface 412 opposite to the light exit end 411, and a light entrance end 413 between the light exit end 411 and the second surface 412, and the second surface 412 is set There is a layer of specular reflective material. When light enters the specular light guide element 400 from the light incident end 413 , the specular reflective material layer disposed on the second surface 412 reflects the light so that the light is emitted from the light output end 411 . When no light enters the specular light guide element 400 from the light incident end 413 , the specular reflective material layer disposed on the second surface 412 can provide a mirror function.

In this embodiment, the specular light guide element 400 is, for example, a semicircular solid cylinder. The light emitting end 411 of the mirror light guide element 400 is a curved surface connected to the second surface 412 , and the second surface 412 is, for example, a plane. Of course, the specular light guide element 400 can also be a semicircular hollow cylinder. In addition, the shape of the specular light guide element 400 is not limited to the above-mentioned semi-cylinder, it can be a solid or hollow cylinder of other suitable shapes, and the second surface 412 can be designed as a curved surface according to requirements. Please refer to FIG. 3 , in the embodiment where both the third light guide element 216 and the fourth light guide element 218 are mirror light guide elements 400 , the light exit ends 411 of the third light guide element 216 and the fourth light guide element 218 Facing the sensing area 219 , the light source module 220 is adapted to provide light to the light incident ends 413 of the third light guide element 216 and the fourth light guide element 218 .

Please refer to FIG. 6 . FIG. 6 is a schematic structural diagram of a specular light guide element according to another embodiment of the present invention. The function of the specular light guide element 400 a is similar to that of the above specular light guide element 400 , the difference lies in the shape. Specifically, the mirror light guide element 400a of this embodiment is hollow, and the mirror light guide element 400a is connected and surrounded by plates 401, 402, 403, 404, and the light incident end 413 of the mirror light guide element 400a is connected to the light The output ends 411 are respectively an opening. The second surface 412 is opposite to the light emitting end 411 , and the second surface 412 is provided with a mirror reflective material layer. Please refer to FIG. 3 , in the embodiment where the light guide strip 400 a is used as the third light guide element 216 and the fourth light guide element 218 , the light emitting 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 guide element 216 and the fourth light guide element 218 .

Please refer to FIG. 7 . FIG. 7 is a schematic structural diagram of a specular light guide element according to another embodiment of the present invention. The mirror light guide element 400b is similar to the above mirror light guide element 400a, the difference lies in that the light incident end 413 and the light output end 411 are respectively a transparent layer. Specifically, the specular light guide element 400b of this embodiment is hollow, and the specular light guide element 400a is connected and surrounded by plates 401, 402, 403, 404 and light-transmitting layers 405, 406. The specular light guide element 400a The light incident end 413 is the light-transmitting layer 405 , and the light-emitting end 411 is the light-transmitting layer 406 . As such, please refer to FIG. 3 , in the embodiment where the light guide strip 400 b is used as the third light guide element 216 and the fourth light guide element 218 , the light emitting 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 guide element 216 and the fourth light guide element 218 . The light-transmitting layers 405 and 406 are suitable for making the light provided by the light source module 220 smoothly enter the light-incident end 413 and exit from the light-exit end 411 to the sensing area 219 . The light-transmitting layers 405 and 406 can be made of light-transmitting materials such as plastic film or glass.

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

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

The aforementioned image detection module 230 is disposed between adjacent ends of the first light guide element 212 and the second light guide element 214 . The field of view of the image detection module 230 covers the sensing area 219 , the third light guide element 216 and the fourth light guide element 218 . Therefore, the image detection module 230 can effectively detect the optical information of the shading object in the sensing area 219 and the virtual image of the shading object formed by the third light guiding element 216 or the fourth light guiding element 218, so as to accurately locate the sensing area. The positions (coordinates) of the shades in the area 219 .

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

The positioning method of the optical touch device suitable for the above optical touch device 200 will be described in detail below.

The positioning method of the optical touch device applicable to the above optical touch device 200 includes the following steps:

The first light emitting element 222 and the second light emitting element 224 of the optical touch device 200 are controlled to emit light alternately. When the first light emitting element 222 is turned on and the second light emitting element 224 is turned off, the image detection module 230 detects a first optical information. When the first light emitting element 222 is turned off and the second light emitting element 224 is turned on, the image detection module 230 detects a second optical information; and

According to the first optical information and the second optical information detected by the image detection module 230 , the position of the light-shielding object located in the sensing area 219 is determined.

Specifically, as shown in 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 the light-shielding object C located in the sensing area 219 will form a A virtual image C1, and the image detection module 230 can detect the first optical information (such as dark spots C2, C3) about the shading object C and the virtual image C1. In this way, the distances d3 and d4 can be calculated, and the position (coordinates) of the shade C can be calculated in conjunction with other known parameters. The above-mentioned other known parameters include the length of the sensing area 219 on the X axis, the width of the sensing area 219 on the Y axis, and the shortest distance from the shade C to the fourth light guide element 218 is equal to the virtual image C1 to the fourth light guide element 218 shortest distance etc. The detailed coordinate calculation method is common knowledge in the technical field, and will not be described in detail here.

In addition, please refer 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 guide element 216 provides a mirror function, so the shade C located in the sensing region 219 will form a virtual image C4, and the image detection module 230 can detect the second optical information (such as dark spots C5 and C6) about the shading object C and the virtual image C4. In this way, the distances d5 and d6 can be calculated, and the position (coordinates) of the shade C can be calculated in conjunction with other known parameters.

Then, according to the first optical information and the second optical information detected by the image detection module 230 , the position of the light-shielding object C located in the sensing area 219 can be determined. Generally, the correct position (coordinates) of the shading object C can be calculated respectively from the first optical information and the second optical information.

However, as mentioned above, when the optical touch device has only one mirror assembly, there will be blind spots. In the optical touch device 200 of this 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 object in the sensing area 219 is just in the blind area, it may not be possible to obtain an effective and available first optical touch device 200. Information. However, when the first light-emitting element 222 is turned off and the second light-emitting element 224 is turned on, the shading object of the sensing region 219 will not be located in the blind area, so that effective and available second optical information can be obtained, so the second optical information can be The correct position (coordinates) of the shade in the sensing area 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, the Another optical information to calculate the correct position of the shade. Therefore, the optical touch device 200 and its positioning method of this embodiment can effectively solve the problem of blind spots.

It is worth mentioning that the optical touch device 200 and its positioning method of this embodiment are beneficial to be applied in the field of double-touch or multi-touch. The following will take dual-touch as an example for description.

The positioning method when the optical touch device 200 is applied to double-touch is similar to the above-mentioned positioning method when single-touch is applied, and the following only describes the situation when ghosting occurs. 10 and 11 are respectively schematic diagrams showing the above-mentioned optical touch device 200 applied to dual-touch.

Please refer to FIG. 10 first. 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 the shading objects E and F located in the sensing area 219 will form a virtual image. E1, F1, and the image detection module 230 can detect the first optical information (such as dark spots M1, E2, F2) about the shading objects E, F and the virtual images E1, E2. Since the dark spot M1 is formed by overlapping two points, the positions of the three shading objects E, F, and G1 will be calculated from the first optical information, and the shading object G1 is the so-called ghost image, which does not really exist. , so the correct position of the shading objects E and F cannot be determined at this time.

Please refer 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 218 provides a mirror function, so the shading objects E and F located in the sensing area 219 will form a virtual image E3 , F3, and the image detection module 230 can detect the first optical information (such as dark spots M2, E4, F4) about the shading objects E, F and the virtual images E3, E3. Since the dark point M2 is formed by overlapping two points, the positions of the three shading objects E, F, and G2 are calculated from the second optical information, and the shading object G2 is a so-called ghost image, which does not really exist. Since the possible positions calculated by the first optical information and the possible positions calculated by the second optical information both include the positions of the shading objects E and F, the positions of the shading objects G1 and G2 can be excluded to determine the correctness of the shading objects E and F Location.

Since the optical touch device 200 and its positioning method of this embodiment adopt the design of making the first light emitting element 222 and the second light emitting element 224 emit light alternately, so as to obtain the first optical information and the second optical information. Because the method of calculating the correct position of the shading object based on the first optical information and the second optical information is relatively simple, the optical touch device 200 and its positioning method of this embodiment are beneficial to be applied in the field of double-touch or multi-point Touch field.

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

The advantages of the optical touch device 200 a in this 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 other optical information can be used to calculate the correct position of the shading object. Therefore, the optical touch device and its positioning method of the present invention can effectively solve the problem of blind spots.

2. When the optical touch device and its positioning method of the present invention are applied to the field of double touch or multi-touch, because the first optical information and the second optical information detected by the image detection module include Less data (ie fewer dark spots) reduces the complexity of calculating the correct position of the shading object. Therefore, the optical touch device and its positioning method of the present invention are beneficial to be applied in the field of double-touch or multi-touch.

3. In addition to the line light source module of the present invention being used to provide a line light source, since the surface (i.e. the second surface) of the specular light guide element is provided with a specular reflective material layer, when the light-emitting element is turned off, the specular light guide element can provide a mirror surface Function.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with this field Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the technical content disclosed above to make some changes or modify them into equivalent embodiments with equivalent changes, but any content that does not depart from the technical solution of the present invention, according to the present invention Any simple modifications, equivalent changes and modifications made to the above embodiments by the technical essence still belong to the scope of the technical solution of the present invention.

Claims (12)

1. optical touch control apparatus is characterized in that comprising:

one light guide module, comprise one first light-guide device of arranging along four limits of a rectangular path, one second light-guide device, one the 3rd light-guide device and one the 4th light-guide device, this first light-guide device, this second light-guide device, form a sensing region between the 3rd light-guide device and the 4th light-guide device, this first light-guide device is relative with the 3rd light-guide device, this second light-guide device is relative with the 4th light-guide device, this first light-guide device and this second light-guide device have respectively a first surface in the face of this sensing region, the 3rd light-guide device and the 4th light-guide device are respectively a minute surface light-guide device, each minute surface light-guide device has a light exit side in the face of this sensing region, one second surface and the light incident side this light exit side and this second surface between relative with this light exit side, and this second surface is provided with a minute surface reflective material layer,

One light source module comprises:

One first light-emitting component is in order to provide light this light incident side to the 3rd light-guide device;

One second light-emitting component, in order to light this light incident side to the 4th light-guide device to be provided, wherein this first light-emitting component and this second light-emitting component are suitable for alternately luminously, and those first surfaces of this first light-guide device and this second light-guide device are suitable for ray guidance to this sensing region; And

One image detecting module is arranged between this first light-guide device and the second light-guide device adjacent both ends, and this sensing region, the 3rd light-guide device and the 4th light-guide device are contained in the visual field of this image detecting module.

2. optical touch control apparatus according to claim 1, it is characterized in that wherein this first light-guide device and this second light-guide device are respectively a light-strip, this light-strip has more a reflecting surface and relative with this first surface and is connected in light entrance face between this first surface and this reflecting surface, and this first surface is a light-emitting face, and this light source module is more suitable for providing light those light entrance faces to this first light-guide device and this second light-guide device.

3. optical touch control apparatus according to claim 2, it is characterized in that wherein said the first light-emitting component is arranged between this second light-guide device and the 3rd light-guide device adjacent both ends, and this first light-emitting component is more in order to provide light this light entrance face to this second light-guide device, this second light-emitting component is arranged between the 4th light-guide device and the first light-guide device adjacent both ends, and this second light-emitting component is more in order to provide light this light entrance face to this first light-guide device.

4. optical touch control apparatus according to claim 1, it is characterized in that wherein this first light-guide device and this second light-guide device are respectively a reflecting strips, this first surface of this reflecting strips is a reflecting surface, this light source module more comprises one the 3rd light-emitting component, be arranged between the adjacent both ends of this first light-guide device and the second light-guide device, to provide light to this sensing region, those reflecting strips are used for being passed to the light reflection of those first surfaces to this sensing region.

5. optical touch control apparatus according to claim 4, is characterized in that wherein said the 3rd light-emitting component is light emitting diode.

6. optical touch control apparatus according to claim 1, is characterized in that wherein said minute surface light-guide device is solid cylinder or hollow cylinder.

7. optical touch control apparatus according to claim 6, is characterized in that wherein said minute surface light-guide device is semicylinder, and this light exit side of this minute surface light-guide device is one to be connected in the curved surface of this second surface.

8. optical touch control apparatus according to claim 1, is characterized in that wherein said minute surface light-guide device is hollow form, and this light incident side of this minute surface light-guide device and this light exit side are respectively an opening or a photic zone.

9. optical touch control apparatus according to claim 1, this second surface that it is characterized in that wherein said minute surface light-guide device is curved surface or plane.

10. optical touch control apparatus according to claim 1, is characterized in that it more comprises a substrate, and this light guide module and this light source module are arranged at this substrate.

11. optical touch control apparatus according to claim 1 is characterized in that wherein this first light-emitting component and this second light-emitting component are light emitting diode.

12. the localization method of an optical touch control apparatus is applicable to optical touch control apparatus claimed in claim 1, it is characterized in that the localization method of this optical touch control apparatus comprises:

This first light-emitting component and this second light-emitting component of this light source module of controlling this optical touch control apparatus is alternately luminous, when this first light-emitting component is opened and this second light-emitting component when closing, this image detecting module detects one first optical information, close and this second light-emitting component when opening when this first light-emitting component, this image detecting module detects one second optical information; And

This first optical information that detects according to this image detecting module and the judgement of this second optical information are positioned at the position of the shade of this sensing region.

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