CN103365479A - Optical touch control device - Google Patents

Abstract

An optical touch control device comprise a panel body, a first scanning ray generating module, a second scanning ray generating module, a first light sensing module, a second light sensing module, a storage for storing a lookup table and a processing unit. When at least one object touches one touch area of one surface of the panel body, the objects reflect first scanning rays generated by the first scanning ray generating module in at least one first time sequence and second scanning rays generated by the second scanning ray generating module in at least one second time sequence. The processing unit acquires at least one angle information group according to each first time sequence, each second time sequence and the lookup table, and then acquires a touch point position according to each angle information group.

Description

Optical touch-control device

Technical field

The present invention relates to a kind of contactor control device, particularly relate to a kind of optical touch-control device.

Background technology

See also Fig. 1, a kind of existing optical touch control panel correlation technique, such as the open disclosed optical detection apparatus of TW201035836 patent of TaiWan, China, it comprises scanister 110, detecting device 120, and comparison module 130.Wherein, scanister 110 comprises light source 112, catoptron 114, and is coupled to the revolving actuator 116 of catoptron 114; Light source 112 is in order to produce scanning ray; Catoptron 114 configurations reflect into detection zone 140 with scanning ray; Revolving actuator 116 makes the incident angle of scanning ray along with the time changes in order to rotating mirror 114 whereby.Detecting device 120 configuration comes detection of reflected light, and wherein, reflection ray is produced by true contact T1, T2 reflection detection zone 140 is interior by scanning ray.The time signal that comparison module 130 is produced in the time of can being detected by detecting device 120 according to reflection ray is distinguished true contact T1, T2 and empty contact G1, G2 (or claiming terrible point (ghost point)).

Yet, above-mentioned existing optical detection apparatus is to utilize triangulation location (triangulation) to try to achieve the position of true contact T1, T2, and the computation complexity of its tangent that relates to (tangent) function and cotangent (cotangent) function is higher.

Summary of the invention

The object of the present invention is to provide a kind of optical touch-control device.Optical touch-control device of the present invention, comprise: a panel body, first a scanning ray generation module, second a scanning ray generation module, first optical sensing module, second optical sensing module, a storer, and a processing unit.

This panel body comprises a surface, and this surface has a touch area.This first scanning ray generation module is in order to produce constantly one first scanning ray, first an angle time to time change of this first scanning ray and a reference line; This first scanning ray generation module is also in order to provide the time corresponding with this first scanning ray.This second scanning ray generation module is in order to produce constantly one second scanning ray, second an angle time to time change of this second scanning ray and this reference line; This second scanning ray generation module is also in order to provide the time corresponding with this second scanning ray.This first optical sensing module is in order to light sensing, and this first optical sensing module can produce first sensing signal when sensing the light that surpasses a certain strength.This second optical sensing module is in order to light sensing, and this second optical sensing module can produce second sensing signal when the light that senses above this certain strength.This storer is used for storing a look-up table of setting up in advance, and this look-up table comprises a plurality of times, and corresponds respectively to a plurality of angle informations of described time.This processing unit is electrically connected on this first scanning ray generation module, this second scanning ray generation module, this first optical sensing module, this second optical sensing module, and this storer.

When having at least one object to touch this touch area, this at least one object can reflect the first scanning ray that this first scanning ray generation module produces at least one very first time sequence, and correspondence produces at least one consecutive the first sensing signal by this first optical sensing module sensing; This at least one object also can reflect the second scanning ray that this second scanning ray generation module produces at least one the second time series, and correspondence produces at least one consecutive the second sensing signal by this second optical sensing module sensing; Wherein, this at least one very first time sequence quantity with

The expression, quantity of this at least one the second seasonal effect in time series with

Expression.

This processing unit should in reception

Individual very first time sequence reaches should

After individual the second time series, according to this

Individual very first time sequence obtains

First searches index also according to being somebody's turn to do

Individual the second time series obtains

Individual second searches index, again according to being somebody's turn to do Individual first searches index reaches this Individual second searches index, cooperates this look-up table to obtain at least one angle information group, then tries to achieve a touch points position according to each angle information group.

Beneficial effect of the present invention is: by setting up in advance and be stored in this look-up table of this storer, this processing unit does not need to carry out any trigonometric function operation fully, can be according to this at least one the angle information group that is obtained by this look-up table, try to achieve this at least one touch points coordinate, significantly reduce the required computation complexity in location.

Description of drawings

Fig. 1 is the schematic diagram of existing a kind of optical detection apparatus;

Fig. 2 is the schematic diagram of the optical touch-control device of a preferred embodiment of the present invention;

Fig. 3 is the circuit block diagram of the optical touch-control device of this preferred embodiment of the present invention;

Fig. 4 is the schematic diagram of the optical touch-control device of this preferred embodiment of the present invention, shows the example that single touch points is only arranged;

Fig. 5 is the process flow diagram for a touch points localization method of the optical touch-control device of this preferred embodiment of the present invention;

Fig. 6 is the schematic diagram of the optical touch-control device of this preferred embodiment of the present invention, shows that the center of a plurality of touch points and one of them scanning mirror is total to an example of straight line;

Fig. 7 is the schematic diagram of the optical touch-control device of this preferred embodiment of the present invention, shows that described touch points is not total to an example of straight line with the center of any scanning mirror;

Fig. 8 is the schematic diagram of the optical touch-control device of this preferred embodiment of the present invention, shows that described touch points is not total to an example of straight line with the center of any scanning mirror.

Embodiment

For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.At first need to prove, the present invention is not limited to following embodiment, and those skilled in the art should understand the present invention from the spirit that following embodiment embodies, and each technical term can be done the most wide in range understanding based on Spirit Essence of the present invention.Same or analogous member uses the same reference numerals to represent among the figure.

See also Fig. 2 and Fig. 3, the optical touch-control device 2 of a preferred embodiment of the present invention comprises a panel body 21, first a scanning ray generation module 22, second a scanning ray generation module 23, first optical sensing module 24, second optical sensing module 25, an extinction element 26, a storer 27, and a processing unit 28.

As shown in Figure 2, in this preferred embodiment, this panel body 21 comprises a surface 211, and this surface 211 has the touch area 212 of a rectangle, reaches a neighboring area 213 around this touch area 212.This first scanning ray generation module 22 and this second scanning ray generation module 23 are the wherein one side that is arranged at symmetrically this neighboring area 213 with respect to a median vertical line L1, further, this the first scanning ray generation module 22 is arranged at the upper right corner of this neighboring area 213, and this second scanning ray generation module 23 is arranged at the upper left corner of this neighboring area 213; In order to produce constantly one first scanning ray 31 and one second scanning ray 32, first angle of this first scanning ray 31 and a reference line L2 is (with θ respectively for this first scanning ray generation module 22 and this second scanning ray generation module 23 _{R_i}Expression) in time (with t _iExpression) change, similarly, second angle of this second scanning ray 32 and this reference line L2 is (with θ _{L_i}Expression) also (t in time _i) and change.This first optical sensing module 24 and this second optical sensing module 25 be arranged at symmetrically this neighboring area 213 with respect to this median vertical line L1 this wherein on one side, further, this the first optical sensing module 24 is arranged at the upper right corner of this neighboring area 213, and this second optical sensing module 25 is arranged at the upper left corner of this neighboring area 213; This first optical sensing module 24 and this second optical sensing module 25 are respectively in order to light sensing, this first optical sensing module 24 is when sensing the light that surpasses a certain strength, can produce first sensing signal, similarly, this second optical sensing module 25 can produce second sensing signal when the light that senses above this certain strength.This extinction element 26 is other three limits that are arranged at this neighboring area 213, an inboard 261 of this extinction element 26 is to be coated with extinction and not catoptrical material, and it can reduce the probability that this first optical sensing module 24 and this second optical sensing module 25 sense unnecessary interference light.

Structure and the function mode of this first scanning ray generation module 22 and this second scanning ray generation module 23 are similar, this the first scanning ray generation module 22 comprises a luminescence unit 221, and scanning mirror unit 222, this scanning mirror unit 222 comprises a scanning mirror 223, and an actuator (actuator) 224, this scanning mirror 223 has a center C 1; This second scanning ray generation module 23 comprises a luminescence unit 231, and a scanning mirror unit 232, and this scanning mirror unit 232 comprises a scanning mirror 233, and an actuator 234, and this scanning mirror 233 has a center C 2; This reference line L2 is by described center C 1, C2.

Wherein, described luminescence unit 221,231 is in order to emission of light; In this preferred embodiment, described luminescence unit 221,231 can be the laser diode (laser diode) in order to Emission Lasers light, yet, described luminescence unit 221,231 also can be light emitting diode (the light-emitting diode of other kinds in order to emission of light, LED), be not limited to this preferred embodiment disclosed.Described scanning mirror 223,233 is subject to respectively described actuator 224,234 actuating, and carry out reciprocally swinging take described center C 1, C2 as center of rotation respectively, further, described scanning mirror 223,233 is respectively take described center C 1, C2 as center of rotation, a time cycle (with T _MirrorExpression) in a pendulum angle scope (with ± θ _MirrorExpression) carries out reciprocally swinging in; The light of described luminescence unit 221,231 emissions is incident to respectively described scanning mirror 223,233, and respectively by described scanning mirror 223,233 reflections, whereby, produces constantly this first scanning ray 31 and this second scanning ray 32; This scanning mirror unit 222,223 also provides this scanning mirror 223,233 pendulum angle and corresponding time thereof sustainably, further, this the first scanning ray generation module 22 can offer this processing unit 28 time corresponding with this first scanning ray 31, and this second scanning ray generation module 23 also can offer this processing unit 28 with the time corresponding with this second scanning ray 32; In this preferred embodiment, described scanning mirror unit 222,232 can adopt for example micro scanning mirror MEMS (micro electro mechanical system) of Lemoptix company (MEMS Scanning Micromirrors).

This storer 27 is used for storing a look-up table (lookup table) 271, and this look-up table 271 comprises a plurality of times, and corresponds respectively to a plurality of angle informations of described time.In this preferred embodiment, this look-up table 271 is divided into two and searches sublist, describedly search one first that sublist is respectively corresponding to this first scanning ray generation module 22 and search sublist, and search sublist corresponding to second of this second scanning ray generation module 23; This first is searched sublist and has n time, and corresponds respectively to n the angle information of a described n time; This second is searched sublist and has n time, and corresponds respectively to n the angle information of a described n time.It is worth mentioning that, because " this first scanning ray 31 that this first scanning ray generation module 22 produces, this first angle (θ of itself and this reference line L2 _{R_i}) along with time (t _i) variation relation ", and " this second scanning ray 32 that this second scanning ray generation module 23 produces, this second angle (θ of itself and this reference line L2 _{L_i}) along with time (t _i) variation relation ", both are all known, so this of this look-up table 271 first searched sublist and this second and searched sublist and all can set up in advance.The content of this look-up table 271 as shown in Table 1.

Table one

In this preferred embodiment, t _n=T _Mirror, and

The described angle information of this look-up table 271 is this first angle (θ _{R_i}, i=1,2 ..., n) and this second angle (θ _{L_i}, i=1,2 ..., tan value n).

This processing unit 28 is electrically connected on this first scanning ray generation module 22, this second scanning ray generation module 23, this first optical sensing module 24, this second optical sensing module 25, and this storer 27.

See also Fig. 3 and Fig. 4, when at least one object being arranged (for example, one user's finger, figure does not show) when touching this touch area 212, this at least one object can reflect this first scanning ray generation module 22 in each first scanning ray 31 of at least one very first time sequence, to form one first reflection ray 41 and by these the first optical sensing module 24 sensings, and this first optical sensing module 24 can correspondingly produce first sensing signal and send this processing unit 28 to when sensing each first reflection ray 41; Further, when having this at least one object to touch this touch area 212, this processing unit 28 can receive at least one consecutive the first sensing signal that this first optical sensing module 24 produces, and also receives simultaneously this at least one very first time sequence that this first scanning ray generation module 22 provides.Similarly, this object also can reflect this second scanning ray generation module 23 in each second scanning ray 32 of at least one second seasonal effect in time series, to form one second reflection ray 42 and by these the second optical sensing module 25 sensings, and this second optical sensing module 25 can correspondingly produce second sensing signal and send this processing unit 28 to when sensing each second reflection ray 42; Further, when having this at least one object to touch this touch area 212, this processing unit 28 also can receive at least one consecutive the second sensing signal that this second optical sensing module 25 produces, also receive simultaneously this at least one second time series that this second scanning ray generation module 23 provides, wherein, this at least one very first time sequence quantity with

The expression, quantity of this at least one the second seasonal effect in time series with

Expression.Then, this processing unit 28 should in reception Individual very first time sequence reaches should

After individual the second time series, according to this

Individual very first time sequence obtains

Individual first searches index, and according to this

Individual the second time series obtains Individual second searches index; Then, this processing unit 28 is according to being somebody's turn to do

Individual first searches index reaches this

Individual second searches index, cooperates this look-up table 271 to obtain at least one angle information group; At last, this processing unit 28 is tried to achieve this object in a touch points position of this touch area 212 according to each angle information group.

The preferred embodiment of corresponding the invention described above optical touch-control device 2 below cooperates a kind of touch points localization method for optical touch-control device, further specifies when having at least one object to touch this touch area 212 running of this processing unit 28.

See also Fig. 3, Fig. 4 and Fig. 5, in step 501, at least one consecutive the first sensing signal that these processing unit 28 these first optical sensing modules 24 of reception produce, at least one consecutive the second sensing signal that this second optical sensing module 25 produces, at least one very first time sequence that this first scanning ray generation module 22 provides reach at least one second time series that this second scanning ray generation module 23 provides; Wherein, this at least one at least one very first time sequence of consecutive the first sensing signal and this is corresponding, and this at least one at least one second time series of consecutive the second sensing signal and this is corresponding.

In step 502, this processing unit 28 is according to a quantity of this at least one very first time sequence

And quantity of this at least one the second seasonal effect in time series

Determine whether single touch points (that is to say, single object touches this touch area 212), if, then proceed the processing of step 503, otherwise, proceed the processing of step 507.Wherein, if this quantity of this at least one very first time sequence, both all equal at 1 o'clock to reach this at least one this quantity of the second seasonal effect in time series, that is to say, Then be judged as single touch points.

Following steps 503～506th are about the processing of single touch points.

In step 503, this processing unit 28 obtains one first according to this very first time sequence and searches index, and obtains one second according to this second time series and search index.

Suppose that this very first time sequence is (t _R, t _R+ 1 ..., t _R+ p), this second time series is (t _L, t _L+ 1 ..., t _L+ k), this first searches index and this second calculating formula of searching index is put in order respectively such as formula (1)～(2), and wherein, this first searches index with Index _RExpression, this second searches index with Index _LExpression.

In step 504, this processing unit 28 first is searched index and this second and is searched index according to this, cooperates this look-up table 271 of setting up in advance to obtain an angle information group; This processing unit 28 first is searched index according to this, first search sublist from this of this look-up table 271, find out and be relevant to this first first angle information searching index, and second search index according to this, second search sublist from this of this look-up table 271, find out and be relevant to this second second angle information searching index; This angle information group comprises this first angle information and this second angle information.

Further, this processing unit 28 is according to Index _RFirst search sublist from this of this look-up table 271, find out and be relevant to Index _RFirst a tan value (that is, this first angle information); According to Index _LSecond search sublist from this of this look-up table 271, find out and be relevant to Index _LSecond a tan value (that is, this second angle information); This angle information group comprises this first tan value and this second tan value.

In step 505, this processing unit 28 is tried to achieve a touch points position that should single touch points according to this angle information group.

As shown in Figure 4, for the ease of understanding, carry out first following definition: take the upper left corner of this touch area 212 as a reference origin O (its two-dimentional coordinate is as (0,0)), this touch points position is with a touch points two dimension coordinate (X with respect to this reference origin O _Touch, Y _Touch) represent.This center C 1 of this scanning mirror 223 represents with D with a centre distance of this center C 2 of this scanning mirror 233.A horizontal range of this center C 2 of this reference origin O and this scanning mirror 233 and a vertical range are respectively with X ' and Y ' expression.One line of this touch points position and this center C 1, with this first angle of this reference line L2 with θ _RExpression, a line of this touch points position and this center C 2, with this second angle of this reference line L2 with θ _LExpression.A horizontal range of this touch points position and this center C 1 is with X _RExpression, a horizontal range of this touch points position and this center C 2 is with X _LExpression, the vertical range of this touch points position and this reference line L2 represents with Y.

It is worth mentioning that, because that described this scanning mirror 223,233 setting position are all is known, so X ', Y ', D also are known numeric value.

At first, this processing unit 28 utilizes respectively formula (3)～(4) to calculate X _RAnd X _L, wherein, this first tan value, this second tan value are the known numeric value that is directly found out by this look-up table 271; In this example, this first tan value is tan θ _R, this second tan value is tan θ _L, this angle information group comprises tan θ _RAnd tan θ _L

X _R＝(tanθ _L×D)/(tanθ _R+tanθ _L)…………………………………………·(3)

X _L＝D-X _R…………………………………………………………………·(4)

Then, this processing unit 28 is according to X _RAnd X _L, cooperate this first tan value (tan θ _R), this second tan value (tan θ _L), utilize following formula (5)～(7) to calculate Y.

Y _R＝tanθ _R×X _R………………………………………………………………·(5)

Y _L＝tanθ _L×X _L………………………………………………………………·(6)

At last, this processing unit 28 is according to X _LAnd Y, cooperate X ' and Y ', utilize following formula (8)～(9), can try to achieve this touch points position (with this touch points two dimension coordinate (X _Touch, Y _Touch) expression).

X _touch＝X _L-X′………………………………………………………………(8)

Y _touch＝Y-Y′…………………………………………………………………·(9)

In step 506, this processing unit 28 is carried out the operation (operation) relevant with this touch points position, for example, and the computer instruction operation.

See also Fig. 3, with Fig. 5～8, following steps 507～511st, about the processing of a plurality of touch points (that is to say, a plurality of objects touch this touch area 212), wherein, this quantity of this at least one very first time sequence

And this at least one this quantity of the second seasonal effect in time series Two wherein at least one greater than 1; For the ease of understanding, be to describe take two touch points T1, T2 as example in the following description.

In step 507, this processing unit 28 obtains one first according to each very first time sequence and searches index, and obtains one second according to each second time series and search index; Wherein, each first is searched index and each second to search the account form of index described as step 503.In other words, this processing unit 28 is according to being somebody's turn to do

Individual very first time sequence obtains this

Individual first searches index, and according to this Individual the second time series obtains this

Individual second searches index.

In step 508, this processing unit 28 first is searched index and is cooperated this look-up table 271 of setting up in advance to obtain being relevant to this first first candidate angle information of searching index according to each, and second search index and cooperate this look-up table 271 of setting up in advance according to each, obtain being relevant to this second second candidate angle information of searching index.In other words, this processing unit 28 is according to being somebody's turn to do

Individual first searches index cooperates this look-up table 271 of setting up in advance, obtains this Individual the first candidate angle information, and according to this

Individual second searches index cooperates this look-up table 271 of setting up in advance, obtains this Individual the second candidate angle information.

As described touch points T1, T2, during with 2 two one of them common straight lines of this center C of this center C 1 of this scanning mirror 223 and this scanning mirror 233, And

Two one of them be 1.Further, if

And

This center C 1 that then represents described two touch points T1, T2 and this scanning mirror 223 is straight line altogether, and this processing unit 28 first is searched index find out first a candidate angle information in this look-up table according to this, and according to this Individual second searches index finds out in this look-up table

Individual the second candidate angle information; If

And

This center C 2 that then represents described two touch points T1, T2 and this scanning mirror 233 is total to straight line, and this processing unit 28 is according to being somebody's turn to do

Individual first searches index finds out in this look-up table

Individual the first candidate angle information, and second search index and in this look-up table, find out second a candidate angle information according to this.For instance, as shown in Figure 6, this center C 1 of these two touch points T1, T2 and this scanning mirror 223 is straight line altogether,

And This processing unit 28 first is searched index find out first a candidate angle information in this look-up table according to this, and searches index according to these two second find out two the second candidate angle information in this look-up table.

When described touch points T1, T2 not with this center C 1 of this scanning mirror 223 straight line altogether, and described touch points T1, T2 be also with this center C 2 of this scanning mirror 233 altogether during straight line, And

Two all greater than 1; Further, if

And N _Touch＞1, represent that then described touch points T1, T2 neither are total to straight line with this center C 1, also are not total to straight line with this center C 2.For instance, shown in Fig. 7～8,

This processing unit 28 is searched index according to these two first and find out two the first candidate angle information in this look-up table, and searches index according to these two second find out two the second candidate angle information in this look-up table.

In step 509, these processing unit 28 bases

Individual the first candidate angle information reaches

Individual the second candidate angle information determines a plurality of angle information groups, and wherein, the deciding means of described angle information group further specifies as follows.

As shown in Figure 6, as described touch points T1, T2, during with described center C 1, two one of them common straight lines of C2, do not have empty contact (terrible point) and occur, thus this processing unit 28 can be directly by

Individual the first candidate angle information reaches

Individual the second candidate angle information is combined into described angle information group.

If

And

This processing unit 28 reaches according to this first candidate angle information should

Individual the second candidate angle information combination goes out

Individual angle information group, wherein, each angle information group comprises this first candidate angle information, and should

Individual the second candidate angle information one of them; If And

Then this processing unit 28 is according to being somebody's turn to do

Individual the first candidate angle information and this second candidate angle information combination go out

Individual angle information group, wherein, each angle information group comprises this

Individual the first candidate angle information one of them, and this second candidate angle information.For instance, as shown in Figure 6, this first candidate angle information is Described the second candidate angle information is

And tan θ _L2, one of them angle information group comprises

And

Another angle information group comprises

And tan θ _L2

Shown in Fig. 7～8, when described touch points T1, T2 not with this center C 1 of this scanning mirror 223 straight line altogether, and described touch points T1, T2 yet, do not have empty contact G1, G2 and occur altogether during straight line with this center C 2 of this scanning mirror 233; In the case,

And N _Touch＞1, this processing unit 28 is searched index according to described first and find out N in this look-up table _TouchIndividual the first candidate angle information, and search index according to described second and in this look-up table, find out N _TouchIndividual the second candidate angle information goes out N according to described the first candidate angle information and described the second candidate angle information combination again _TouchIndividual angle information group.

It is worth mentioning that, because described object and the described scanning mirror 223 of this touch area 212 of touching, 233 distance are different, can cause to some extent difference of described very first time sequence and described the second seasonal effect in time series length, below be further to summarize one first processing mode and one second processing mode based on this principle, to determine described angle information group.In the following description, N _Touch=2, suppose that described very first time sequence sequentially is expressed as respectively And

$S_{R_{1-\mathrm{st}}}=(t_{R_{1-\mathrm{st}}},t_{R_{1-\mathrm{st}}}+1,...,t_{R_{1-\mathrm{st}}}+l),$ $S_{R_{2-\mathrm{nd}}}=(t_{R_{2-\mathrm{nd}}},t_{R_{2-\mathrm{nd}}}+1,...,t_{R_{2-\mathrm{nd}}}+m),$ And

Described the second time series sequentially is expressed as respectively

And

$S_{L_{1-\mathrm{st}}}=(t_{L_{1-\mathrm{st}}},t_{L_{1-\mathrm{st}}}+1,...,t_{L_{1-\mathrm{st}}}+n),$ $S_{L_{2-\mathrm{nd}}}=(t_{L_{2-\mathrm{nd}}},t_{L_{2-\mathrm{nd}}}+1,...,t_{L_{2-\mathrm{nd}}}+o),$ And

The length of described very first time sequence sequentially is expressed as respectively

And

Described the second seasonal effect in time series length sequentially is expressed as respectively

And

Described the first candidate angle information is tan θ _R1And

Described the second candidate angle information is tan θ _L1And

Wherein, θ _R1＜θ _R2, θ _L1＜θ _L2, further, $\tan {\mathrm{\&theta;}}_{R_1}<\tan {\mathrm{\&theta;}}_{R_2},$ $\tan {\mathrm{\&theta;}}_{L_1}<\tan {\mathrm{\&theta;}}_{L_2}.$

[the first processing mode]

As shown in Figure 7, when

And

The time, then one of them angle information group (to should touch points T1) comprises tan θ _R2And

Another angle information group (to should touch points T2) comprises

And tan θ _L2

[the second processing mode]

As shown in Figure 8, when

And

The time, then one of them angle information group (to should touch points T1) comprises tan θ _R1And

Another angle information group (to should touch points T2) comprises tan θ _R2And tan θ _L2

In step 510, this processing unit 28 is tried to achieve respectively a plurality of touch points position of corresponding described touch points T1, T2 according to described angle information group; Wherein, the account form of each touch points position is described as step 505.

In step 511, this processing unit 28 is carried out the operation relevant with described touch points position.

In sum, by setting up in advance and be stored in this look-up table 271 of this storer 27, this processing unit 28 does not need to carry out any trigonometric function operation fully, can be according to this at least one the angle information group that is obtained by this look-up table 271, try to achieve this at least one touch points coordinate, significantly reduce the required computation complexity in location; Moreover, by analyzing this at least one very first time sequence and this at least one second time series, the location that can further process a plurality of touch points; So really can reach purpose of the present invention.

It is the above-described preferred embodiment of the present invention that only is, when not limiting scope of the invention process with this, be that every simple equivalence of doing according to the present patent application claim and invention description content changes and modifies, all still belong in the scope that patent of the present invention contains.

Claims (10)

1. optical touch-control device comprises: a panel body, and this panel body comprises a surface, this surface has a touch area; It is characterized in that, this optical touch-control device also comprises:

A first scanning ray generation module, in order to produce constantly one first scanning ray, a first angle time to time change of this first scanning ray and a reference line, this first scanning ray generation module are also in order to provide the time corresponding with this first scanning ray;

A second scanning ray generation module, in order to produce constantly one second scanning ray, a second angle time to time change of this second scanning ray and this reference line, this second scanning ray generation module are also in order to provide the time corresponding with this second scanning ray;

First optical sensing module, in order to light sensing, this first optical sensing module can produce first sensing signal when sensing the light that surpasses a certain strength;

Second optical sensing module, in order to light sensing, this second optical sensing module can produce second sensing signal when the light that senses above this certain strength;

A storer is used for storing a look-up table of setting up in advance, and this look-up table comprises a plurality of times, and corresponds respectively to a plurality of angle informations of described time; And

A processing unit is electrically connected on this first scanning ray generation module, this second scanning ray generation module, this first optical sensing module, this second optical sensing module, and this storer;

When having at least one object to touch this touch area, this at least one object can reflect the first scanning ray that this first scanning ray generation module produces at least one very first time sequence, and correspondingly by this first optical sensing module sensing produce at least one consecutive the first sensing signal, this at least one object also can reflect the second scanning ray that this second scanning ray generation module produces at least one the second time series, and correspondingly by this second optical sensing module sensing produce at least one consecutive the second sensing signal, wherein, this at least one very first time sequence quantity with

The expression, quantity of this at least one the second seasonal effect in time series with

Expression;

This processing unit should in reception

Individual very first time sequence reaches should After individual the second time series, according to this

Individual very first time sequence obtains

First searches index also according to being somebody's turn to do

Individual the second time series obtains

Individual second searches index, again according to being somebody's turn to do

Individual first searches index reaches this Individual second searches index, cooperates this look-up table to obtain at least one angle information group, then tries to achieve a touch points position according to each angle information group.

2. optical touch-control device as claimed in claim 1, it is characterized in that: this first scanning ray generation module comprises a luminescence unit, and scanning mirror unit, this scanning mirror unit of this first scanning ray generation module comprises a scanning mirror with a center, this the second scanning ray generation module comprises a luminescence unit, and scanning mirror unit, this scanning mirror unit of this second scanning ray generation module comprises a scanning mirror with a center, and this reference line is by the described center of described scanning mirror.

3. optical touch-control device as claimed in claim 2 is characterized in that: this processing unit is according to each angle information group, and a described center centre distance between the two of described scanning mirror, in the hope of this touch points position.

4. optical touch-control device as claimed in claim 1 is characterized in that: when this at least one object touched this touch area, this processing unit was also according to this quantity of this at least one very first time sequence

And this at least one this quantity of the second seasonal effect in time series

Determine whether single touch points, if

Then be judged as single touch points.

5. optical touch-control device as claimed in claim 4 is characterized in that: when this processing unit is judged as single touch points, suppose that this very first time sequence is (t _R, t _R+ 1 ..., t _R+ p), this second time series is (t _L, t _L+ 1 ..., t _L+ k), this processing unit utilizes following formula, calculates this and first searches index and this second and search index, and wherein, this first searches index with Index _RExpression, this second searches index with Index _LExpression:

6. optical touch-control device as claimed in claim 4, it is characterized in that: when this processing unit is judged as single touch points, this processing unit first is searched index and this second and is searched index according to this, find out respectively first angle information and second angle information in this look-up table, this angle information group comprises this first angle information and this second angle information.

7. optical touch-control device as claimed in claim 4 is characterized in that: when this processing unit is judged as non-single touch points, if

And Then this processing unit first is searched index find out first a candidate angle information in this look-up table according to this, and according to this

Individual second searches index finds out in this look-up table

Individual the second candidate angle information, reaching according to this first candidate angle information should again

Individual the second candidate angle information combination goes out

Individual angle information group, wherein, each angle information group comprises this first candidate angle information, and should

Individual the second candidate angle information one of them;

If

And Then this processing unit is according to being somebody's turn to do

Individual first searches index finds out in this look-up table

Individual the first candidate angle information, and second search index find out second a candidate angle information in this look-up table according to this was again according to should

Individual the first candidate angle information and this second candidate angle information combination go out

Individual angle information group, wherein, each angle information group comprises this

Individual the first candidate angle information one of them, and this second candidate angle information.

8. optical touch-control device as claimed in claim 4 is characterized in that: when this processing unit is judged as non-single touch points, if And N _Touch＞1, then this processing unit is searched index according to described first and find out N in this look-up table _TouchIndividual the first candidate angle information, and search index according to described second and in this look-up table, find out N _TouchIndividual the second candidate angle information goes out N according to described the first candidate angle information and described the second candidate angle information combination again _TouchIndividual angle information group.

9. optical touch-control device as claimed in claim 8 is characterized in that: if N _Touch=2, suppose that described very first time sequence sequentially is expressed as respectively

And $S_{R_{2-\mathrm{nd}}}=(t_{R_{2-\mathrm{nd}}},t_{R_{2-\mathrm{nd}}}+1,...,t_{R_{2-\mathrm{nd}}}+m),$ And $t_{R_{1-\mathrm{st}}}+l<t_{R_{2-\mathrm{nd}}},$ Described the second time series sequentially is expressed as respectively $S_{L_{1-\mathrm{st}}}=(t_{L_{1-\mathrm{st}}},t_{L_{1-\mathrm{st}}}+1,...,t_{L_{1-\mathrm{st}}}+n)$ And $S_{L_{2-\mathrm{nd}}}=(t_{L_{2-\mathrm{nd}}},t_{L_{2-\mathrm{nd}}}+1,...,t_{L_{2-\mathrm{nd}}}+o),$ And

The length of described very first time sequence sequentially is expressed as respectively

And

Described the second seasonal effect in time series length sequentially is expressed as respectively

And

Described the first candidate angle information is tan θ _R1And

Described the second candidate angle information is tan θ _L1And Wherein, θ _R1＜θ _R2, θ _L1＜θ _L2

When

And The time, then one of them angle information group comprises tan θ _R2And Another angle information group comprises

And tan θ _L2

10. optical touch-control device as claimed in claim 8 is characterized in that: if N _Touch=2, suppose that described very first time sequence sequentially is expressed as respectively

And $S_{R_{2-\mathrm{nd}}}=(t_{R_{2-\mathrm{nd}}},t_{R_{2-\mathrm{nd}}}+1,...,t_{R_{2-\mathrm{nd}}}+m),$ And $t_{R_{1-\mathrm{st}}}+l<t_{R_{2-\mathrm{nd}}},$ Described the second time series sequentially is expressed as respectively $S_{L_{1-\mathrm{st}}}=(t_{L_{1-\mathrm{st}}},t_{L_{1-\mathrm{st}}}+1,...,t_{L_{1-\mathrm{st}}}+n)$ And $S_{L_{2-\mathrm{nd}}}=(t_{L_{2-\mathrm{nd}}},t_{L_{2-\mathrm{nd}}}+1,...,t_{L_{2-\mathrm{nd}}}+o),$ And

The length of described very first time sequence sequentially is expressed as respectively

And

Described the second seasonal effect in time series length sequentially is expressed as respectively

And

Described the first candidate angle information is tan θ _R1And

Described the second candidate angle information is tan θ _L1And Wherein, θ _R1＜θ _R2, θ _L1＜θ _L2

When

And

The time, then one of them angle information group comprises tan θ _R1And

Another angle information group comprises tan θ _R2And tan θ _L2

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