TW201337686A - Optical touch device - Google Patents

Abstract

An optical touch device is disclosed, which includes: a panel body, a first scanning light beam generation module, a second scanning light beam generation module, a first light sensor module, a second light sensor module, a memory used for storing a look-up table, and a processing unit. When at least one object touches a touch region of a surface of the panel body, the at least one object would reflect a first scanning light beam generated during at least a first time series by the first scanning light beam generation module, and a second scanning light beam generated during at least a second time series by the second scanning light beam generation module. According to the first time series and the second time series collocated with the look-up table, the processing unit obtains at least one angle information set, and obtains a touch point location according to each angle information set.

Description

Optical touch device

The present invention relates to a touch device, and more particularly to an optical touch device.

Referring to FIG. 1 , a related art optical touch panel related art, such as the optical detecting device disclosed in Japanese Patent Publication No. TW 201035836, includes a scanning device 110, a detector 120, and a difference module 130. The scanning device 110 includes a light source 112, a mirror 114, and a rotary actuator 116 coupled to the mirror 114; the light source 112 is used to generate scanning light; the mirror 114 is configured to reflect the scanning light into the detection area 140; Rotary actuator 116 is used to rotate mirror 114, thereby causing the angle of incidence of the scanning ray to change over time. The detector 120 is configured to detect reflected light, wherein the reflected light is generated by the reflected light being reflected by the real contacts T1, T2 in the detection area 140. The difference module 130 can distinguish the real contacts T1, T2 and the virtual contacts G1, G2 (or ghost points) according to the time signal generated when the reflected light is detected by the detector 120.

However, the above-mentioned conventional optical detecting device uses triangulation to obtain the positions of the real contacts T1 and T2, and the tangent function and the cotangent function involved are relatively high in computational complexity. .

Accordingly, it is an object of the present invention to provide an optical touch device.

Therefore, the optical touch device of the present invention comprises a panel body, a first scanning light generating module, a second scanning light generating module, a first light sensing module and a second light sensing module. , a memory, and a processing unit.

The panel body includes a surface having a touch area. The first scanning light generating module is configured to continuously generate a first scanning light, and a first angle of the first scanning light and a reference line changes with time; the first scanning light generating module is further configured to provide A time corresponding to the first scanning ray. The second scanning light generating module is configured to continuously generate a second scanning light, wherein a second angle of the second scanning light and the reference line changes with time; the second scanning light generating module is further configured to provide A time corresponding to the second scanning ray. The first light sensing module is configured to sense light, and the first light sensing module generates a first sensing signal when sensing light exceeding a certain intensity. The second light sensing module is configured to sense light, and the second light sensing module generates a second sensing signal when sensing light exceeding the specific intensity. The memory is configured to store a pre-established lookup table, the lookup table including a plurality of times, and a plurality of angle information respectively corresponding to the time. The processing unit is electrically connected to the first scanning light generating module, the second scanning light generating module, the first light sensing module, the second light sensing module, and the memory.

When at least one object touches the touch area, the at least one object reflects the first scanning light generated by the first scanning light generating module in at least one first time series, and the first light sensation is The sensing module is configured to generate at least one series of first sensing signals; the at least one object further reflects the second scanning light generated by the second scanning light generating module in at least one second time series, and the first scanning light is generated by the second scanning light generating module The two light sensing modules sense and correspondingly generate at least one series of second sensing signals; wherein, the quantity of the at least one first time series is Representing that the quantity of the at least one second time series is Said.

The processing unit is receiving the First time series and the After the second time series, according to the First time series get First lookup index and according to the Second time series get Second lookup index, then according to the First lookup index and the The second search index cooperates with the lookup table to obtain at least one angle information group, and then obtains a touch point position according to each angle information group.

The effect of the present invention is that, by the lookup table pre-established and stored in the memory, the processing unit does not need to perform any trigonometric function calculation at all, according to the at least one angle information group obtained by the lookup table. The at least one touch point coordinate is obtained, which greatly reduces the computational complexity required for positioning.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Referring to FIG. 2 and FIG. 3, a preferred embodiment of the optical touch device 2 of the present invention comprises a panel body 21, a first scanning light generating module 22, a second scanning light generating module 23, and a first The light sensing module 24, a second light sensing module 25, a light absorbing element 26, a memory 27, and a processing unit 28.

As shown in FIG. 2, in the preferred embodiment, the panel body 21 includes a surface 211 having a rectangular contact area 212 and a peripheral area 213 surrounding the touch area 212. The first scanning light generating module 22 and the second scanning light generating module 23 are symmetrically disposed on one side of the peripheral region 213 with respect to a vertical center line L1. Further, the first scanning light is generated. The second scanning light generating module 23 is disposed at an upper left corner of the peripheral area 213; the first scanning light generating module 22 and the second scanning light generating module are disposed in the upper right corner of the peripheral area 213. 23 for continuously generating a first scanning ray 31 and a second scanning ray 32, a first angle (indicated by θ _{R _ i} ) of the first scanning ray 31 and a reference line L2 with time (in t _i represents a change, and similarly, a second angle (indicated by θ _{L _ i} ) of the second scanning ray 32 and the reference line L2 also changes with time ( t _i ). The first light sensing module 24 and the second light sensing module 25 are symmetrically disposed on the one side of the peripheral region 213 with respect to the vertical center line L1, and further, the first light sense The second light sensing module 25 is disposed at an upper left corner of the peripheral region 213; the first light sensing module 24 and the second light sensing module are disposed at an upper right corner of the peripheral region 213. The group 25 is configured to sense light. The first light sensing module 24 generates a first sensing signal when sensing light exceeding a certain intensity. Similarly, the second light sensing module 25 When a light exceeding the specific intensity is sensed, a second sensing signal is generated. The light absorbing element 26 is disposed on the other three sides of the peripheral region 213. An inner side 261 of the light absorbing element 26 is coated with a material that absorbs light and does not reflect light, which can reduce the first light sensing module 24 and The second light sensing module 25 senses the probability of unnecessary noise light.

The first scanning light generating module 22 and the second scanning light generating module 23 are similar in structure and operation. The first scanning light generating module 22 includes a light emitting unit 221 and a scanning mirror unit 222. The mirror unit 222 includes a scanning mirror 223, and an actuator 224 having a center C1. The second scanning light generating module 23 includes a light emitting unit 231 and a scanning mirror unit 232. The scanning mirror unit 232 includes a scanning mirror 233, and an actuator 234 having a center C2; the reference line L2 passes through the centers C1, C2.

The light emitting units 221 and 231 are configured to emit light rays. In the preferred embodiment, the light emitting units 221 and 231 may be laser diodes for emitting laser light. The light-emitting units 221 and 231 may also be other kinds of light-emitting diodes (LEDs) for emitting light, and are not limited to the preferred embodiment. The scanning mirrors 223 and 233 are respectively actuated by the actuators 224 and 234, and reciprocally oscillate with the centers C1 and C2 as rotation centers respectively. Further, the scanning mirrors 223 and 233 respectively Reciprocatingly swinging within a range of swing angles (indicated by ± θ _mirror ) in a period of time (indicated by T _mirror ) with the centers C1 and C2 as the center of rotation; the light rays emitted by the light-emitting units 221 and 231 are respectively Incidentally incident on the scanning mirrors 223, 233, and reflected by the scanning mirrors 223, 233, respectively, thereby continuously generating the first scanning light 31 and the second scanning light 32; the scanning mirror units 222, 223 The swing angle of the scanning mirrors 223, 233 and the corresponding time are continuously provided. Further, the first scan light generating module 22 supplies a time corresponding to the first scanning light 31 to the The processing unit 28, and the second scanning light generating module 23 also supplies a time corresponding to the second scanning light 32 to the processing unit 28; in the preferred embodiment, the scanning mirror unit 222 232 can be used, for example, Lemoptix Micro-scanning micro-electromechanical systems (MEMS Scanning Micromirrors).

The memory 27 is configured to store a lookup table 271 that includes a plurality of times and a plurality of angle information respectively corresponding to the time. In the preferred embodiment, the lookup table 271 is divided into two search sub-tables, respectively, and the first search sub-table corresponding to the first scan light generation module 22, and corresponding to the a second lookup subtable of the second scan ray generating module 23; the first lookup subtable has n times, and n angle information corresponding to the n times respectively; the second lookup subtable has n Time, and n angle information corresponding to the n times respectively. It is worth mentioning that, due to the first scanning ray 31 generated by the first scanning light generating module 22, the first angle (θ _{R _ i} ) of the first scanning ray 31 with the reference line L2 is over time ( t _i And the second scanning ray 32 generated by the second scanning ray generating module 23, the second angle (θ _{L _ i} ) of the reference line L2 with time ( t _{i )} The change relationship of the two is known, so the first lookup subtable and the second lookup subtable of the lookup table 271 can be pre-established. The contents of the lookup table 271 are as shown in Table 1.

In the preferred embodiment, t _n = T _mirror and t _i - t _{i -1} = Δ t = The angle information of the lookup table 271 is the first angle (θ _{R _ i} , i =1, 2, . . . , n ) and the second angle (θ _{L_ i} , i =1, 2,. The tangent function value of .., n ).

The processing unit 28 is electrically connected to the first scanning light generating module 22, the second scanning light generating module 23, the first light sensing module 24, the second light sensing module 25, and the memory. Body 27.

Referring to FIG. 3 and FIG. 4, when at least one object (for example, a user's finger, not shown) touches the touch area 212, the at least one object reflects the first scanning light generating module. Each of the first scanning rays 31 of the at least one first time series is formed by a first reflected light ray 41 and sensed by the first light sensing module 24, and the first light sensing module 24 is When each of the first reflected rays 41 is sensed, a first sensing signal is generated correspondingly and transmitted to the processing unit 28; and further, when the at least one object touches the touch region 212, The processing unit 28 receives the at least one series of first sensing signals generated by the first light sensing module 24 and simultaneously receives the at least one first time series provided by the first scanning light generating module 22 . Similarly, the object also reflects the second scanning light generating module 23 for each of the second scanning rays 32 of the at least one second time series to form a second reflected light 42 and is used by the second light sensing mode. The second light sensing module 25 senses each second reflected light 42 to generate a second sensing signal and transmits it to the processing unit 28; further, When the at least one object touches the touch area 212, the processing unit 28 further receives at least one series of second sensing signals generated by the second light sensing module 25, and simultaneously receives the second Scanning the at least one second time series provided by the light generating module 23, wherein the number of the at least one first time series is Representing that the quantity of the at least one second time series is Said. Then, the processing unit 28 receives the First time series and the After the second time series, according to the First time series get First lookup index, and according to the Second time series get Second lookup index; then, the processing unit 28 is based on First lookup index and the The second lookup index is matched with the lookup table 271 to obtain at least one angle information group. Finally, the processing unit 28 determines a touch point position of the object in the touch area 212 according to each angle information group.

Corresponding to the preferred embodiment of the optical touch device 2 of the present invention, the touch point positioning method for the optical touch device is further described below, and further, when at least one object touches the touch region 212, The operation of the processing unit 28.

Referring to FIG. 3, FIG. 4 and FIG. 5, in step 501, the processing unit 28 receives at least one series of first sensing signals generated by the first light sensing module 24, and the second light sensing module 25 At least one series of second sensing signals, at least one first time series provided by the first scanning light generating module 22, and at least one second time series provided by the second scanning light generating module 23; The at least one series of first sensing signals corresponds to the at least one first time series, and the at least one series of second sensing signals corresponds to the at least one second time series.

In step 502, the processing unit 28 is based on a quantity of the at least one first time series ( And a quantity of the at least one second time series ( It is judged whether it is a single touch point (that is, a single object touches the touch area 212), and if so, the processing of step 503 is continued, otherwise, the processing of step 507 is continued. Wherein, if the quantity of the at least one first time series and the quantity of the at least one second time series are both equal to 1, that is, =1, it is judged as a single touch point.

The following steps 503-506 are related to the processing of a single touch point.

In step 503, the processing unit 28 obtains a first lookup index according to the first time series, and obtains a second lookup index according to the second time series.

Assuming that the first time series is ( t _R , t _R +1,..., t _R + p ), the second time series is ( t _L , t _L +1,..., t _L + k ) The calculation formulas of the first lookup index and the second lookup index are respectively organized as equations (1) to (2), wherein the first lookup index is represented by Index _R , and the second lookup index is represented by Index _L.

In step 504, the processing unit 28 obtains an angle information group according to the first lookup index and the second search index, and the processing unit 28 obtains an angle information group according to the first search index. The first lookup sub-table of the table 271 finds a first angle information related to the first lookup index, and searches for the correlation from the second lookup sub-table of the lookup table 271 according to the second lookup index. a second angle information of the second search index; the angle information group includes the first angle information and the second angle information.

Still further, the processing unit 28 from the _{R & lt} Index lookup table 271 of the first sub-table lookup, to find a correlation function value in a first tangent _{R & lt} Index (i.e., the first angle information); The Index _L from the second lookup sub-table of the lookup table 271, find a second tangent function value (ie, the second angle information) related to Index _L ; the angle information group includes the first tangent function value and the The second tangent function value.

In step 505, the processing unit 28 determines a touch point position corresponding to the single touch point based on the angle information group.

As shown in FIG. 4, for ease of understanding, the following definition is first made: an upper left corner of the touch area 212 is a reference origin O (the two-dimensional coordinate is (0, 0)), and the touch point position is It is represented by a touch point two-dimensional coordinate ( X _touch , Y _touch ) with respect to the reference origin O. A center distance between the center C1 of the scanning mirror 223 and the center C2 of the scanning mirror 233 is represented by D. A horizontal distance and a vertical distance between the reference origin O and the center C2 of the scanning mirror 233 are represented by X' and Y' , respectively. a line connecting the touch point to the center C1, the first angle of the reference line L2 being represented by θ _R , a line connecting the touch point and the center C2, and the line of the reference line L2 The second angle is represented by θ _L . A horizontal distance between the touch point position and the center C1 is represented by X _R , and a horizontal distance between the touch point position and the center C2 is represented by X _L , and a vertical distance between the touch point position and the reference line L2 Expressed in Y.

It is worth mentioning that since the positions of the scanning mirrors 223 and 233 are all known, X' , Y' , and D are also known values.

First, the processing unit 28 calculates X _R and X _L by using equations (3) to (4), respectively, wherein the first tangent function value and the second tangent function value are directly found by the lookup table 271. A numerical value is known; in this example, the first tangent function value is tan θ _R , and the second tangent function value is tan θ _L , and the angle information group includes tan θ _R and tan θ _L .

X _L = D - X _R ................................................(4)

Then, the processing unit 28 calculates Y according to X _R and X _{L in} accordance with the first tangent function value (tan θ _R ) and the second tangent function value (tan θ _L ) by the following equations (5) to (7). .

Y _R =tanθ _R × X _R .............................................(5)

Y _L =tanθ _L × X _L .............................................(6)

Finally, the processing unit 28 can determine the position of the touch point by using the following equations (8) to (9) according to X _L and Y , and using X' and Y' (the two-dimensional coordinates of the touch point ( X _touch , Y _touch ))).

X _touch = X _L - X' .................................................(8)

Y _touch = Y - Y' ....................................................(9)

In step 506, the processing unit 28 performs an operation associated with the location of the touch point, such as a computer instruction operation.

Referring to FIG. 3 and FIG. 5-8, the following steps 507-511 are related to a plurality of touch points (that is, a plurality of objects touch the touch area 212), wherein the at least one first The number of time series ( And the number of the at least one second time series ( At least one of the two is greater than one; for ease of understanding, the following description will be made by taking two touch points T1 and T2 as an example.

In step 507, the processing unit 28 obtains a first lookup index according to each first time sequence, and obtains a second search index according to each second time sequence; wherein each first search index and each first The second lookup index is calculated as described in step 503. In other words, the processing unit 28 is based on the First time series get this First lookup index, and according to the Second time series get this Second lookup index.

In step 508, the processing unit 28 obtains a first candidate angle information related to the first lookup index according to the first lookup index and the pre-established lookup table 271, and cooperates with each second search index according to each The lookup table 271 is created to obtain a second candidate angle information related to the second lookup index. In other words, the processing unit 28 is based on the The first lookup index cooperates with the pre-established lookup table 271 to obtain the First candidate angle information, and according to The second lookup index cooperates with the pre-established lookup table 271 to obtain the Second candidate angle information.

When the touch points T1, T2 are in line with one of the center C1 of the scanning mirror 223 and the center C2 of the scanning mirror 233, and One of the two is 1. Further, if =1 and >1, indicating that the two touch points T1, T2 are in line with the center C1 of the scanning mirror 223, and the processing unit 28 searches for a first candidate angle information from the lookup table according to the first lookup index. And according to Second lookup index is found from the lookup table Second candidate angle information; >1 and =1, it means that the two touch points T1 and T2 are in line with the center C2 of the scanning mirror 233, and the processing unit 28 First lookup index is found from the lookup table The first candidate angle information is used to find a second candidate angle information from the lookup table according to the second lookup index. For example, as shown in FIG. 6, the two touch points T1 and T2 are in line with the center C1 of the scanning mirror 223. =1 and =2, the processing unit 28 searches for a first candidate angle information from the lookup table according to the first lookup index, and searches for two second candidate angle information from the lookup table according to the two second lookup indexes. .

When the touch points T1 and T2 are not in line with the center C1 of the scanning mirror 223, and the touch points T1 and T2 are not in line with the center C2 of the scanning mirror 233, and Both are greater than 1; further, if If N _touch and N _touch >1, it means that the touch points T1 and T2 are not in line with the center C1 and are not in line with the center C2. For example, as shown in Figures 7-8, = N _touch = 2, the processing unit 28 searches for two first candidate angle information from the lookup table according to the two first lookup indexes, and searches for two from the lookup table according to the two second lookup indexes. Second candidate angle information.

In step 509, the processing unit 28 is based on First candidate angle information and The second candidate angle information determines a plurality of angle information groups, wherein the manner of determining the angle information group is further described as follows.

As shown in FIG. 6, when the touch points T1 and T2 are in line with one of the centers C1 and C2, no virtual contact (ghost point) occurs, so the processing unit 28 can Directly by First candidate angle information and The second candidate angle information combines the angle information group.

If =1 and >1, the processing unit 28 according to the first candidate angle information and the Second candidate angle information combined An angle information group, wherein each angle information group includes the first candidate angle information, and the One of the second candidate angle information; >1 and =1, the processing unit 28 is based on the The first candidate angle information and the second candidate angle information are combined Angle information group, wherein each angle information group includes the One of the first candidate angle information, and the second candidate angle information. For example, as shown in FIG. 6, the first candidate angle information is tan. The second candidate angle information is tan And tan θ _{L 2} , wherein an angle information group includes tan And tan Another angle information group includes tan And tan θ _{L 2} .

As shown in FIGS. 7-8, when the touch points T1 and T2 are not in line with the center C1 of the scanning mirror 223, and the touch points T1 and T2 are not coincident with the center C2 of the scanning mirror 233, When there are a total line, there will be virtual contacts G1 and G2; in this case, = N _touch and N _touch >1, the processing unit 28 searches for N _touch first candidate angle information from the lookup table according to the first lookup index, and searches from the lookup table according to the second lookup index. N _touches a second candidate angle information, and then combines the N _touch angle information groups according to the first candidate angle information and the second candidate angle information.

It is worth mentioning that, because the distance between the object touching the touch area 212 and the scanning mirrors 223 and 233 is different, the lengths of the first time series and the second time series may be different. The following is based on this principle to further generalize a first processing mode and a second processing mode to determine the angle information group. In the following description, N _touch = 2, assuming that the first time series are sequentially expressed as and ,among them, =( +1,..., + l ), =( +1,..., + m ), and + l < The second time series are sequentially expressed as and ,among them, =( +1,..., + n ), =( +1,..., + o ), and + n < The length of the first time series is expressed as | |and| |, where,| |= l ,| |= m ; the length of the second time series is expressed as | |and| |, where,| |= n ,| |= o ; the first candidate angle information is tan θ _{R 1} and tan The second candidate angle information is tan θ _{L 1} and tan Where θ _{R 1} <θ _{R 2} , θ _{L 1} <θ _{L 2} , and further, tan <tan Tan <tan .

[First treatment method]

As shown in Figure 7, when | |<| |, and | |<| When it is, one of the angle information groups (corresponding to the touch point T1) includes tan θ _{R 2} and tan , another angle information group (corresponding to touch point T2) including tan And tan θ _{L 2} .

[Second treatment method]

As shown in Figure 8, when | |>| |, and | |>| When it is, one of the angle information groups (corresponding to the touch point T1) includes tan θ _{R 1} and tan The other angle information group (corresponding to the touch point T2) includes tan θ _{R 2} and tan θ _{L 2} .

In step 510, the processing unit 28 respectively determines a plurality of touch point positions corresponding to the touch points T1 and T2 according to the angle information group; wherein each touch point position is calculated in the same manner as step 505. Said.

In step 511, the processing unit 28 performs an operation associated with the touch point location.

In summary, by the lookup table 271 pre-established and stored in the memory 27, the processing unit 28 does not need to perform any trigonometric operation at all, and can be based on the at least one angle obtained by the lookup table 271. The information group obtains the at least one touch point coordinate to greatly reduce the computational complexity required for the positioning; further, by analyzing the at least one first time series and the at least one second time series, the plurality of The positioning of the touch point; indeed, the object of the present invention can be achieved.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

2. . . Optical touch device

twenty one. . . Panel body

211. . . surface

212. . . Touch area

213. . . Surrounding area

twenty two. . . First scanning light generation module

221. . . Light unit

222. . . Scanning mirror unit

223. . . Scanning mirror

224. . . Actuator

twenty three. . . Second scanning light generation module

231. . . Light unit

232. . . Scanning mirror unit

233. . . Scanning mirror

234. . . Actuator

twenty four. . . First light sensing module

25. . . Second light sensing module

26. . . Absorbing element

261. . . Inside

27. . . Memory

271. . . Lookup table

28. . . Processing unit

31. . . First scanning light

32. . . Second scanning light

41. . . First reflected light

42. . . Second reflected light

L1. . . Vertical centerline

L2. . . reference line

C1, C2. . . center

T1, T2. . . Touch point

G1, G2. . . Virtual contact

1 is a schematic view of a conventional optical detecting device;

2 is a schematic view of a preferred embodiment of the optical touch device of the present invention;

3 is a circuit block diagram of the preferred embodiment of the optical touch device of the present invention;

4 is a schematic view of the preferred embodiment of the optical touch device of the present invention, illustrating an example of only a single touch point;

5 is a flow chart of a touch point positioning method for the preferred embodiment of the optical touch device of the present invention;

6 is a schematic diagram of the preferred embodiment of the optical touch device of the present invention, illustrating an example in which a plurality of touch points are in line with the center of one of the scanning mirrors;

7 is a schematic diagram of the preferred embodiment of the optical touch device of the present invention, illustrating an example in which the touch point is not in line with the center of any scanning mirror;

FIG. 8 is a schematic diagram of the preferred embodiment of the optical touch device of the present invention, illustrating an example in which the touch point is not in line with the center of any of the scanning mirrors.

2. . . Optical touch device

twenty two. . . First scanning light generation module

221. . . Light unit

222. . . Scanning mirror unit

223. . . Scanning mirror

224. . . Actuator

twenty three. . . Second scanning light generation module

231. . . Light unit

232. . . Scanning mirror unit

233. . . Scanning mirror

234. . . Actuator

twenty four. . . First light sensing module

25. . . Second light sensing module

27. . . Memory

271. . . Lookup table

28. . . Processing unit

Claims (10)

An optical touch device includes: a panel body including a surface having a touch area; a first scanning light generating module for continuously generating a first scanning light, the first scanning light A first angle of incidence with a reference line varies with time, the first scanning light generating module is further configured to provide a time corresponding to the first scanning light; and a second scanning light generating module is configured to continue Generating a second scanning ray, the second scanning ray and a second angle of the reference line change with time, the second scanning ray generating module is further configured to provide a time corresponding to the second scanning ray a first light sensing module for sensing light, the first light sensing module generating a first sensing signal when sensing light exceeding a certain intensity; and a second light sensing a module for sensing light, the second light sensing module generates a second sensing signal when sensing light exceeding the specific intensity; and a memory for storing a pre-established lookup table , the lookup table includes multiple times And a plurality of angle information corresponding to the time; and a processing unit electrically connected to the first scanning light generating module, the second scanning light generating module, the first light sensing module, and the first a second light sensing module, and the memory; when at least one object touches the touch area, the at least one object reflects the first scanning light generating module generated by the at least one first time series The first scanning light is sensed by the first light sensing module to generate at least one series of first sensing signals, and the at least one object further reflects the second scanning light generating module in at least one second time series And generating, by the second light sensing module, at least one series of second sensing signals, wherein the quantity of the at least one first time series is Representing that the quantity of the at least one second time series is Representing; the processing unit is receiving the First time series and the After the second time series, according to the First time series get First lookup index and according to the Second time series get Second lookup index, then according to the First lookup index and the The second search index cooperates with the lookup table to obtain at least one angle information group, and then obtains a touch point position according to each angle information group. The optical touch device of claim 1, wherein the first scanning light generating module comprises a light emitting unit, and a scanning mirror unit, the scanning mirror of the first scanning light generating module The unit includes a scanning mirror having a center, the second scanning light generating module includes a lighting unit, and a scanning mirror unit. The scanning mirror unit of the second scanning light generating module includes a scanning having a center A mirror that passes through the center of the scanning mirror. The optical touch device of claim 2, wherein the processing unit determines the center distance between each of the angle information groups and the center of the scanning mirror. Touch the point location. The optical touch device of claim 1, wherein the processing unit further determines the number according to the at least one first time series when the at least one object touches the touch area And the number of the at least one second time series , to determine whether it is a single touch point, if =1, it is judged as a single touch point. The optical touch device of claim 4, wherein when the processing unit determines that the touch point is a single touch point, the first time series is assumed to be ( t _R , t _R +1, . t _R + p ), the second time series is ( t _L , t _L +1, . . . , t _L + k ), the processing unit calculates the first lookup index and the second by using the following formula The index is searched, wherein the first lookup index is represented by Index _R , and the second lookup index is represented by Index _L : The optical touch device of claim 4, wherein when the processing unit determines that the touch point is a single touch point, the processing unit selects the lookup table according to the first lookup index and the second lookup index. The first angle information and the second angle information are respectively found in the angle information group, and the angle information group includes the first angle information and the second angle information. The optical touch device of claim 4, wherein when the processing unit determines that it is not a single touch point, =1 and >1, the processing unit searches for a first candidate angle information from the lookup table according to the first lookup index, and according to the Second lookup index is found from the lookup table a second candidate angle information, according to the first candidate angle information and the Second candidate angle information combined An angle information group, wherein each angle information group includes the first candidate angle information, and the One of the second candidate angle information; >1 and =1, the processing unit is based on the First lookup index is found from the lookup table a first candidate angle information, and searching for a second candidate angle information from the lookup table according to the second lookup index, and then according to the The first candidate angle information and the second candidate angle information are combined Angle information group, wherein each angle information group includes the One of the first candidate angle information, and the second candidate angle information. The optical touch device of claim 4, wherein when the processing unit determines that it is not a single touch point, = N _touch and N _{t ouch} >1, the processing unit searches for N _touch first candidate angle information from the lookup table according to the first lookup index, and according to the second lookup index from the lookup table Finding N _touch second candidate angle information, and combining N _touch angle information groups according to the first candidate angle information and the second candidate angle information. According to the optical touch device of claim 8, wherein if N _touch = 2, it is assumed that the first time series is sequentially expressed as =( +1,..., + l ) and =( +1,..., + m ), and + l < The second time series is sequentially expressed as =( +1,..., + n ) and =( +1,..., + o ), and + n < The length of the first time series is expressed as | |and| |, the length of the second time series is expressed as | |and| |, the first candidate angle information is tan θ _{R 1} and tan The second candidate angle information is tan θ _{L 1} and tan Where θ _{R 1} <θ _{R 2} , θ _{L 1} <θ _{L 2} ; when | |<| |, and | |<| When it is, one of the angle information groups includes tan θ _{R 2} and tan Another angle information group includes tan And tan θ _{L 2} . According to the optical touch device of claim 8, wherein if N _touch = 2, it is assumed that the first time series is sequentially expressed as =( +1,..., + l ) and =( +1,..., + m ), and + l < The second time series is sequentially expressed as =( +1,..., + n ) and =( +1,..., + o ), and + n < The length of the first time series is expressed as | |and| |, the length of the second time series is expressed as | |and| |, the first candidate angle information is tan θ _{R 1} and tan The second candidate angle information is tan θ _{L 1} and tan Where θ _{R 1} <θ _{R 2} , θ _{L 1} <θ _{L 2} ; when | |>| |, and | |>| When, the angle information group includes tan θ _{R 1} and tan The other angle information group includes tan θ _{R 2} and tan θ _{L 2} .