CN102096521B - Optical touch device and optical touch display device - Google Patents

Abstract

The invention provides an optical touch device suitable for a display surface. The optical touch device comprises a light source, a light guide unit and a light detector. The light source is arranged beside the display surface and is suitable for providing light beams. The light guide unit is arranged beside the display surface, is arranged on a transmission path of the light beam, and comprises a light guide body and a Lambertian light scattering structure. The light guide body is provided with a first surface, a second surface, a third surface, a fourth surface and a light incident surface. The light beam is suitable for entering the light guide body through the light incoming surface and is suitable for being transmitted to the sensing space in front of the display surface from the first surface. The lambertian light scattering structure is configured on at least one of the second surface, the third surface and the fourth surface to scatter the light beam to the first surface. The light detector is arranged beside the display surface and used for sensing the light intensity change of the light beam in the sensing space. The invention also provides an optical touch display device.

Description

Optical touch control apparatus and optical touch control display device

Technical field

The present invention relates to a kind of contactor control device (touch apparatus) and display device, and be particularly related to a kind of optical touch control apparatus and optical touch control display device.

Background technology

Along with the progress of photoelectricity science and technology, adopt mouse to come the mode of the object in control computer and the screen can't satisfy user's demand, therefore, the method more humanized than mouse control just is developed gradually.In the method for these hommizations; Mode with finger touch approaches the experience in the human general daily life most; Particularly for the older or the child that can't operate mouse neatly; Can both adopt finger to come touch-control easily, this point can adopt Touch Screen to obtain the confirmation of part from some Automatic Teller Machines.

In addition, traditional mobile computer is normally controlled cursor through being positioned at button other Trackpad and tracing point (track point) if under the situation of external mouse not.Yet as far as general user, utilizing other Trackpad of button or tracing point to control cursor maybe be flexible not as the employing mouse, and the contact panel that is disposed on the screen can solve such problem.This is that the user directly touches screen and comes operand because the control mode of contact panel is a kind of control mode of suitable intuitive.Thus, when contact panel is applied in the mobile computer,, still can utilize contact panel operation glibly flexibly even the user is under the operating environment of inconvenient external mouse.

General now contact panel design roughly can be divided into resistance-type, condenser type, optical profile type, sound wave type and electromagnetic type etc.With optical touch control panel, general common display, light source, light element, sensor, and the processor of comprising.Light source is arranged on that display surface is other to be used for producing light beam, the light beam that it produced through light element after and detected by sensor, when the object touch panel, processor is judged the position of touch points according to the intensity variation that sensor sensed.In addition, light beam is in influencing the accuracy that touch points is judged through the briliancy uniformity coefficient behind the LGP, and the briliancy uniformity coefficient is high more, and accuracy is high more.Yet in known technology, its briliancy skewness after light beam passes through light element, thereby the accuracy of touch points position judgment is also lower.

Summary of the invention

The present invention provides a kind of optical touch control apparatus, and it has higher touch points accuracy of judgement degree.

The present invention provides a kind of optical touch control display device, and it has higher touch points accuracy of judgement degree.

Other purpose of the present invention and advantage can further be understood from the technical characterictic that the present invention disclosed.

For reaching one of above-mentioned or partly or all purposes or other purpose, one embodiment of the invention propose a kind of optical touch control apparatus that is applicable to display surface.Optical touch control apparatus comprises at least one light source, at least one light element and at least one photodetector.Light source is configured in by the display surface, and is suitable for providing light beam.Light element is configured in by the display surface, and is configured on the bang path of light beam.Light element comprises light conductor and lambert's light scattering structure.Light conductor have first surface, second surface, at least one connection first surface and second surface with respect to first surface incidence surface, be connected incidence surface, first surface, and the 3rd surface of second surface, and relative the 3rd surface and connect the 4th surface of incidence surface, first surface and second surface.Light beam is suitable for getting in the light conductor via incidence surface, and is suitable for being passed to the sensing space before the display surface from first surface.Lambert's light scattering structure is configured at least one surface in second surface, the 3rd surface, the 4th surface; So that beam divergence is to first surface, and makes by the light intensity of each rising angle of the normalization light intensity distributions curve of the light beam of first surface outgoing, be less than or equal to 0.2 with the root-mean-square value of the difference of the light intensity of each corresponding rising angle of lambert's normalization light intensity distributions curve.Photodetector is configured in by the display surface, in order to the intensity variation of sensing light beam in sensing space.

Another embodiment of the present invention proposes a kind of optical touch control display device, comprises display and above-mentioned optical touch control apparatus, and wherein display has above-mentioned display surface.

Based on above-mentioned; Embodiments of the invention have with next advantage at least; Because the optical touch control apparatus of embodiments of the invention and optical touch control display device adopt lambert's light scattering structure; So that be similar to lambert's light intensity distributions (Lambertian intensitydistribution) by the light shape of the light beam of first surface outgoing; Therefore the uniformity coefficient of the briliancy (luminance) of the detected first surface of photodetector is better, and then promotes optical touch control apparatus and the optical touch control display device accuracy of judgement degree for touch points.

For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and conjunction with figs. elaborates as follows.

Description of drawings

Figure 1A is the structural representation of the optical touch control display device of embodiments of the invention.

Figure 1B is the diagrammatic cross-section of the optical touch control apparatus of Figure 1A along the I-I line.

Fig. 2 A is light element and the schematic perspective view of light source among Figure 1A.

Fig. 2 B is light conductor and the schematic perspective view of diffusing structure among Fig. 2 A.

Fig. 2 C is that light element among Fig. 2 A is along the diagrammatic cross-section of II-II line.

Fig. 2 D is the light conductor of the light element among Figure 1A and the schematic perspective view of diffusing structure.

Fig. 3 A is the light intensity distributions figure of first surface of the detected light element of photodetector of Figure 1A.

Fig. 3 B for the first surface of light element when diffusing structure is only formed by the printing opacity ink lay by the detected light intensity distributions figure of photodetector.

Fig. 4 A be according to embodiments of the invention under the ratio of different scattering particles and resin combination, light beam via scattering pattern after from the light intensity distributions curve map of light conductor first surface outgoing.

Fig. 4 B is for accordinging to one of embodiments of the invention after light beam is via the scattering pattern with different scattering particle particle diameters, from the light intensity distributions curve map of light conductor first surface outgoing.

The primary clustering symbol description

40: optical touch control display device

50: display

52: display surface

54: housing

60: touch object

100: optical touch control apparatus

110,110a, 110b, 110c, 110d: light source

112,112a, 112b, 112c, 112d: light beam

120,120a, 120b: photodetector

130,130a, 130b, 130c: light element

131: light conductor

132a, 132b, 134b, P0: incidence surface

133: reverberator

140: processing unit

150: diffusing structure

152: scattering pattern

154: resin combination

156: scattering particle

D1: light direction

P1: first surface

P2: second surface

P3: the 3rd surface

P4: the 4th surface

S: sensing space

Embodiment

About aforementioned and other technology contents, characteristics and effect of the present invention, in the detailed description of the embodiment of following conjunction with figs., can clearly appear.The direction term of being mentioned in following examples, for example: upper and lower, left and right, front or rear etc. only are the directions with reference to accompanying drawing.Therefore, the direction term of use is to be used for explaining not to be to be used for limiting the present invention.

Figure 1A is the structural representation of the optical touch control display device of one embodiment of the invention; Figure 1B is the diagrammatic cross-section of the optical touch control apparatus of Figure 1A along the I-I line; Fig. 2 A islight element 130b and the schematic perspective view oflight source 110c among Figure 1A; Fig. 2 B is light conductor and the schematic perspective view of diffusing structure among Fig. 2 A; Fig. 2 C belight element 130b among Fig. 2 A along the diagrammatic cross-section of II-II line, and Fig. 2 D is the light conductor of the light element 130a among Figure 1A and the schematic perspective view of diffusing structure.Please earlier with reference to Figure 1A, Figure 1B, Fig. 2 A to Fig. 2 C, the optical touchcontrol display device 40 of present embodiment comprisesdisplay 50 and optical touch control apparatus 100.In the present embodiment,display 50 comprisesdisplay surface 52 andhousing 54, andhousing 54 is around display surface 52.In the present embodiment, opticaltouch control apparatus 100 is configurable onhousing 54, or is combined into the part of housing 54.Display 50 for example is LCD (LCD), plasma scope (PDP), organic light emitting diode display (OLED display), cathode ray tube (CRT), rear-projection display device (rear projection display) or other display, and the surface ofdisplay surface 52 for watching in order to display frame and confession user.Yet in other embodiments,display surface 52 also can be the viewing area on the projection screen, also is that opticaltouch control apparatus 100 can use with projection arrangement (projection apparatus) collocation, and is disposed at by the viewing area on the projection screen.

Opticaltouch control apparatus 100 comprises at least one light source 110 (be example with fourlight source 110a, 110b, 110c and 110d), at least one light element 130 (be example with threelight element 130a, 130b and 130c) and at least one photodetector 120 (be example with twophotodetector 120a and 120b) in Fig. 1 in Fig. 1 in Fig. 1.It is other thatlight source 110 is configured indisplay surface 52, and be suitable for sending light beam 112.It is other thatlight element 130 is configured indisplay surface 52, and be configured on the bang path of light beam 112.Particularly;Light source 110a, 110b, 110c and 110dsend light beam 112a, 112b, 112c and 112d respectively; Light element 130a is configured on the bang path of light beam 112a;Light element 130b is configured on the bang path oflight beam 112b and 112c, andlight element 130c is configured on the bang path oflight beam 112d.

In the present embodiment, theselight sources 110 comprise that respectively (lightemitting diode LED), is suitable for sending invisible light beam at least one invisible light light emitting diode.For example, theselight sources 110 respectively are an infrared light light emitting diode, and light beam 112a,light beam 112b,light beam 112c andlight beam 112d respectively are an infrared beam.

It is other thatphotodetector 120a, 120b are configured in display surface 52.Photodetector 120a and photodetector 120b for example respectively are a CMOS sensing component (complementarymetal-oxide-semiconductor sensor; CMOS sensor), a Charged Coupled Device sensor (charge coupled device sensor; CCD sensor), a photomultiplier (photomultiplier, PMT) or other suitable image sensor.

Eachlight element 130 compriseslight conductor 131 and diffusing structure 150.Light conductor 131 has first surface P1, with respect to the second surface P2 of first surface P1 and the incidence surface P0 of at least one connection first surface P1 and second surfaceP2.Light beam 112 is suitable for getting in thelight conductor 131 via incidence surface P0, and is suitable for being passed to the sensing space S (zone that dotted line surrounded) before thedisplay surface 52 from first surface P1.

In the present embodiment,light conductor 131 has more the 3rd surperficial P3 and the 4th surperficial P4.The 3rd surperficial P3 connects incidence surface P0, first surface P1 and second surface P2.The 4th surperficial P4 is with respect to the 3rd surperficial P3, and connection incidence surface P0, first surface P1 and second surface P2.In the present embodiment,light element 130 more comprisesreverberator 133, is disposed at least one surface among second surface P2, the 3rd surperficial P3 and the 4th surperficial P4.Particularly,reverberator 133 is for example for being disposed at the reflector plate of second surface P2, the 3rd surperficial P3 and the 4th surperficial P4.

In the present embodiment;Diffusing structure 150 for example is lambert's light scattering structure;Diffusing structure 150 is configured on the second surface P2 oflight conductor 131; But not as limit; In other embodiments; At least one surface among the also configurable second surface P2 atlight conductor 131 ofdiffusing structure 150, the 3rd surperficial P3 or the 4th surperficial P4 so thatlight beam 112 scatters to first surface P1, and makes the light intensity by each rising angle of the normalization light intensity distributions curve of thelight beam 112 of first surface P1 outgoing be less than or equal to 0.2 with root-mean-square value (the root mean square value) D of the difference of the light intensity of each corresponding rising angle of lambert's normalization light intensity distributions curve.Particularly, can being represented by I (θ) by the normalization light intensity distributions curve of thelight beam 112 of first surface P1 outgoing, also is that light intensity I is the function of rising angle θ.The scope of rising angle θ is to+90 degree from-90 degree; Wherein the direction of 0 degree is defined as light direction perpendicular to first surface P1 (withlight element 130b is example; Be light direction D1); And rising angle θ to be positive direction be the direction toward the CW deflection of drawing, and rising angle θ be the direction of the counter clockwise direction deflection of past drawing for negative direction.In addition, lambert's normalization light intensity distributions curve can represent by L (θ) that wherein L (θ)=cos θ, and the scope of θ spends to+90 degree from-90.Lambert's light scattering structure of present embodiment can make the normalization light intensity distributions by thelight beam 112 of first surface P1 outgoing meet following formula:

The root-mean-square value of the difference of light intensity$D=\sqrt{\frac{\mathrm{\Σ}{(I\left(\mathrm{\θ}\right)-L\left(\mathrm{\θ}\right))}^2}{N}}\≤0.2$

In other words, be similar to lambertian distribution, thus, just can form uniform briliancy (luminance) on the first surface P1 by the light intensity distributions of thelight beam 112 of first surface P1 outgoing.In the present embodiment, above-mentioned root-mean-square value D for example is 0.063106.Yet in other embodiments, above-mentioned root-mean-square value also can be 0.075269,0.121543 or other is smaller or equal to 0.2 numerical value.

In the present embodiment; Light element 130a andlight element 130b are configured in respectively on the adjacent both sides ofdisplay surface 52;Light element 130b andlight element 130c are configured in respectively on the adjacent both sides ofdisplay surface 52, and light element 130a andlight element 130c are configured in respectively on the relative both sides of display surface 52.These first surfaces P1 of theselight elements 130 can be towards sensing space S; The first surface P1 of light element 130a and the first surface P1 oflight element 130b are arranged in the sensing range of photodetector 120b, and the first surface P1 of the first surface P1 oflight element 130b andlight element 130c is arranged in the sensing range of photodetector 120a.Photodetector 120 is in order to the intensity variation of sensinglight beam 112 in sensing space S.In the present embodiment, opticaltouch control apparatus 100 also comprisesprocessing unit 140, andprocessing unit 140 is electrically connected to photodetector 120 (promptly being connected tophotodetector 120a and 120b).Whentouch object 60 got into sensing space S,processing unit 140 was according to the position of intensity variationdecision touch object 60 with respect todisplay surface 52.

Particularly; Whentouch object 60 near or touching duringdisplay surface 52; Can block script by the first surface P1 outgoing oflight element 130a, 130b, 130c and thelight beam 112 of enteringphotodetector 120a and photodetector 120b, and then dim spot appears in the image thatphotodetector 120a and photodetector 120b are detected.Through analyzing the position of dim spot, processingunit 140 can calculate the position of touchingobject 60 with respect to displaysurface 52, to reach the effect of touch-control.Touching object 60 for example is not to use person's finger, nib or other suitable object of pointer.In addition, processingunit 140 for example be Digital System Processor (digital signal processor, DSP) or other proper process circuit.Processing unit 140 can be electrically connected to the processor of job platform; For example computing machine, mobile phone, personal digital assistant (personal digital assistant; PDA), the processor of digital camera or other electronic installation, and the processor of job platform can convert touchingobject 60 to various control function with respect to the position signal of display surface 52.In other embodiments, processingunit 140 also can not calculate touchingobject 60 with respect to the position ofdisplay surface 52, and the processor of transferring to job platform calculates.

In the present embodiment; Diffusingstructure 150 comprises a plurality ofscattering pattern 152 that separate each other;Scattering pattern 152 is for example for can make thelight beam 112 by first surface P1 outgoing have the lambert's light scattering pattern that is similar to lambert's light intensity distributions, and thesescattering pattern 152 are along arranging perpendicular to the direction of incidence surface P0 (normal direction) in fact.In addition, in the present embodiment, thesescattering pattern 152 near the number density atlight source 110 places less than thesescattering pattern 152 in number density away fromlight source 110 places.For example, the number density of thesescattering pattern 152 can increase progressively towards the direction away from light source 110.In addition;Light element 130b has two incidence surface P0 respect to one another; Beincidence surface 132b andincidence surface 134b; Light source 110b andlight source 110c are configured in respectively by tworelative incidence surface 132b, the 134b, and thesescattering pattern 152 near the number density atincidence surface 132b and 134b place less than thesescattering pattern 152 in number density near the point midway place betweenincidence surface 132b and the 134b.For example, the number density of thesescattering pattern 152 can increase progressively toward the centre from the two ends oflight element 130b.

In addition, thelight conductor 131 of light element 130a (please with reference to Fig. 2 D) only has incidence surface P0, i.e.incidence surface 132a, and the number density of scatteringpattern 152 is increased progressively toward the end away fromincidence surface 132a by the end near incidence surface132a.Light element 130c and on scatteringpattern 152 and light element 130a and on scatteringpattern 152 similar, and both difference is that the allocation position of first surface P1 and second surface P2 oflight element 130c is in contrast to the first surface P1 of light element 130a and the allocation position of second surface P2.

Because the optical touch control apparatus ofpresent embodiment 100 adopts lambert's light scattering structures (being diffusing structure 150), therefore the light intensity distributions by thelight beam 112 of first surface P1 outgoing can be similar to lambertian distribution, and can form uniform briliancy on the first surface P1.Thus, whentouch object 60 did not get into sensing space S,photodetector 120 just can detect uniform briliancy on each detection angles.Therefore; Whentouch object 60 gets into sensing space S; Processingunit 140 just can calculate the position oftouch object 60 with respect to displaysurface 52 exactly through the light intensity distributions data of analyzingphotodetector 120 and being transmitted, and causes the erroneous judgement to the position oftouch object 60 and can improve to spare because of the luminance nonuniformity of first surface P1.

In the present embodiment, eachscattering pattern 152 comprisesresin combination 154 and a plurality of scattering particle 156.Resin combination 154 for example is the printing opacity ink lay; Andresin combination 154 is configured on the second surface P2; But not as limit, in other embodiments on also configurable at least one surface in second surface P2, the 3rd surperficial P3, the 4th surperficial P4 of resin combination 154.These scatteringparticles 156 are entrained in theresin combination 154, and the collocation throughresin combination 154 andscattering particle 156 just can form lambert's light scattering structure.It should be noted that; It is to be formed by resin combination and scattering particle that the present invention does not limit lambert's light scattering structure; In other embodiments, lambert's light scattering structure also can be other any structure that is similar to lambert's light intensity distributions bylight beam 112 generations of first surface P1 bright dipping that makes.

Fig. 3 A is the light intensity distributions figure of first surface P1 of the detected light element 130b of photodetector 120a of Figure 1A, and Fig. 3 B for the first surface P1 of the light element when diffusing structure is only formed by the printing opacity ink lay by the detected light intensity distributions figure of photodetector 120a.Please with reference to Fig. 3 A and Fig. 3 B, the scope that the detection angles of photodetector 120a contained is right incidence surface 134b from the incidence surface 132b of light element 130b to light element 130b in regular turn by a left side.Please with reference to Fig. 3 B; When diffusing structure only contains the printing opacity ink lay and does not contain scattering particle; Can make light beam 112 that light source 110b sent be partial to positive dirction, and make light beam 112 that light source 110c sent be partial to negative direction from the rising angle θ of first surface P1 outgoing from the rising angle θ of first surface P1 outgoing.Thus, the light beam 112 that light source 110c sent is understood direct light detecting device 120a and is caused stronger light intensity, and the light beam that light source 110b is sent causes more weak light intensity because of major part departs from photodetector 120a.Therefore, the light intensity distributions of Fig. 3 B can form the low right high uneven situation in a left side, so causes the erroneous judgement of touch points position easily.Please refer again to Fig. 3 A; Because the optical touch control apparatus 100 of present embodiment adopts printing opacity ink lay collocation scattering particle 156; Therefore can make light intensity distributions be similar to lambert's intensity distributions by the light beam 112 of the first surface P1 outgoing of light element 130b (comprising the light beam 112 that light beam 112 that luminescence component 110b sent and luminescence component 110c are sent); Thus; Photodetector 120a just can detect the uniform light intensity distributions that is illustrated like Fig. 3 A; And then effectively reduce the optical touch control apparatus 100 of present embodiment and the False Rate of 40 pairs of touch points positions of optical touch control display device, also promptly promote the accuracy of judgement degree of optical touch control apparatus 100 and 40 pairs of touch points positions of optical touch control display device.

For making characteristics of the present invention is clear, and hereinafter will be to diffusingstructure 150 explanation indetail.Diffusing structure 150 has a plurality of scattering pattern separated from one another 152, and thesescattering pattern 152 are arranged onlight conductor 131 at least one surface with respect to the second surface P2 of exiting surface, the 3rd surperficial P3, the 4th surperficial P4.Specifically, the proportion of composing ofresin combination 154 and a plurality of scatteringparticle 156 is adjusted the bright dipping light shape oflight beam 112 in thesescattering pattern 152 of deviser's adjustment capable of using, makes emergingbeam 112 reach the effect of homogenization.On some are used, also can make the normalization light intensity distributions curve of emergingbeam 112 reach the effect of approximate lambert's normalization light intensity distributions curve through the proper proportion of adjustingresin combination 154 in thesescattering pattern 152 and a plurality of scatteringparticle 156.

Particularly; The composition of eachscattering pattern 152 comprisesresin combination 154 and a plurality of scatteringparticle 156; Wherein scatteringparticle 156 is dispersed in theresin combination 154, it should be noted that scatteringparticle 156 and the content ofresin combination 154 in scatteringpattern 152 are recently to calculate with weight percent; In other words; When the ratio of percentage by weight andresin combination 154 the percentage by weight inscattering pattern 152 of scatteringparticle 156 in scatteringpattern 152 more than or equal to 0.1 the time, can come to adjust fully the light shape of emergingbeam 112 through thisscattering pattern 152, shown in earlier figures 3A and Fig. 3 B; When the content of thescattering particle 156 in diffusion patterned satisfies above-mentioned relation; Can make the bright dipping oflight beam 112 behindlight conductor 131 more even, to letphotodetector 120 that the intensity variation of touchless is arranged in can certain detected sensing space S, the situation of avoiding touching erroneous judgement takes place.

In addition; In the present embodiment, because the content of scatteringparticle 156 in scatteringpattern 152 is less than the content ofresin combination 154 in scatteringpattern 152, forexample scattering particle 156 is 0.1 with the ratio ofresin combination 154; Therefore in the present embodiment; Shown in Fig. 2 B-2D, in eachscattering pattern 152,resin combination 154 can be considered external phase;Scattering particle 156 can be considered the disperse phase that is scattered in the external phase, and scatteringparticle 156 for example is to be present in theresin combination 154 to be embedded in the kenel in theresin combination 154.

In the application of reality,, can makelight beam 112 more meet product demand via the light shape behind thescattering pattern 152 throughadjustment scattering particle 156 and the proportion of composing of a plurality of scatteringparticles 156 in scattering pattern 152.For instance; In a kind of application,, can moderately increase the ratio of scatteringparticle 156 andresin combination 154 when making when the bright dipping light shape oflight conductor 131 outgoing is satisfied lambert's light shape; Particularly, the ratio of scatteringparticle 156 andresin combination 154 is preferably smaller or equal to 1.5.What deserves to be mentioned is that scatteringparticle 156 recently calculates with weight percent with the content ofresin combination 154 here.In addition; On practice; From viewpoints such as light utilization ratios; When the content of content that recently calculates thescattering particle 156 in thescattering pattern 152 with weight percent andresin combination 154, the ratio of scatteringparticle 156 andresin combination 154 is preferably more than and equals 0.5 and smaller or equal to 1.5 scope.

In other words; When the content of scatteringparticle 156 in scatteringpattern 152 during greater than the content ofresin combination 154 in scatteringpattern 152; Forexample scattering particle 156 is 1.5 with the ratio ofresin combination 154; At this moment, scattering particle is also can be from the surface of resin combination outstanding and make the surface of scattering pattern form the kenel of micro concavo-convex, and the present invention does not limit the kenel that scattering particle is scattered in resin combination.

Fig. 4 A is a kind of under the ratio of different scattering particles and resin combination according to the embodiment of the invention, light beam via scattering pattern after from the light intensity distributions curve map of light conductor first surface outgoing, wherein the scope of rising angle θ is to spend to+90 from-90 degree.Please, illustrate the light shape of pairing emergingbeam 112 when the ratio of scatteringparticle 156 andresin combination 154 is respectively 0.1,1,1.5 among Fig. 4 A with reference to 4A.Shown in Fig. 4 A, when the ratio of scatteringparticle 156 andresin combination 154 changed, the light intensity distributions curve map oflight beam 112 was that light shape then becomes thereupon.In detail, when the ratio of percentage by weight andresin combination 154 the percentage by weight inscattering pattern 152 of scatteringparticle 156 in scatteringpattern 152 more than or equal to 0.1 the time, can change the light shape of emergingbeam 112 fully.And; Shown in Fig. 4 A; When the ratio of percentage by weight andresin combination 154 the percentage by weight inscattering pattern 152 of scatteringparticle 156 in scatteringpattern 152 is 1,1.5, the approximate lambert's light of light shape after can makinglight beam 112 via scatteringpattern 152.

What deserves to be mentioned is;Scattering particle 156 is not particularly limited with the ratio ofresin combination 154 in thescattering pattern 152; As long as inresin combination 154, add the effect that thescattering particle 156 of enough content can reach the bright dipping light shape ofadjustment light beam 112; In other words; When the ratio of percentage by weight andresin combination 154 the percentage by weight inscattering pattern 152 of scatteringparticle 156 in scatteringpattern 152 more than or equal to 0.1 the time, can emergingbeam 112 be adjusted to preset light shape fully through this scattering pattern 152.For instance; Shown in Fig. 4 A; A kind of preset light shape is in the application of lambert's light shape, can be adjusted to through the ratio with scattering particle in thescattering pattern 156 andresin combination 154 and be essentially 1 or 1.5, then can make emergingbeam 112 be adjusted to preset lambert's light shape; Therefore the present invention does not limit that the ratio of scatteringparticle 156 andresin combination 154 must be special value in thescattering pattern 152, but can moderately adjust according to the preset light shape demand of actual bright dipping.

In addition, for samelight conductor 131, the present invention does not limit thescattering particle 156 of thesescattering pattern 152 that are arranged insame light conductor 131 must be in full accord with the proportion of composing of resin combination 154.Particularly; Forsame light conductor 131, thescattering pattern 152 that is arranged in diverse location can be adjusted the ratio of scatteringpattern 152 scatteringparticles 156 andresin combination 154 in response to the quantity of the quantity of the relative position of itself andphotodetector 120,photodetector 120 andlight element 130 light conductors 131.In other words, the scattering particle in thescattering pattern 152 on thesame light conductor 131 156 can differ from one another in fact with the ratio of resin combination 154.Perhaps; Based on raw material obtain, consideration on production and the manufacturing cost; For thescattering pattern 152 on thesame light conductor 131; The a little difference of ratio tolerable of scatteringparticle 156 andresin combination 154 in thesescattering pattern 152 makes the ratio of scatteringparticle 156 andresin combination 154 in thescattering pattern 152 on thesame light conductor 131 to differ from one another in fact.

According to above-mentioned notion; The deviser can be to the characteristic of the size of optical touch control apparatus, light element 130 (for example; Refractive index), the relative position oflight element 130 andphotodetector 120 waits and adjusts the composition that is positioned at thescattering pattern 152 of diverse location on eachlight conductor 131; Makelight beam 112 whenlight conductor 131 bright dippings, reach the effect of homogenising; Use the sensing sensitivity that promotesphotodetector 120 and, avoid optical touch control apparatus to produce the situation of misoperation for the accuracy of judgement degree of touch points.

When the ratio of scatteringparticle 156 andresin combination 154 satisfies in scatteringpattern 152 more than or equal to 0.1 the time, the directive property that the deviser can further utilize the particle diameter of adjustment scattering particle to come to finely tune emergingbeam 112 auxiliaryly below will cooperate Fig. 4 B to explain in detail.The particle diameter of scatteringparticle 156 does not have special qualification.Particularly, in the present embodiment, the particle diameter of scatteringparticle 156 for example falls within fact more than or equal to 1 micron and smaller or equal to 30 microns scope.

Fig. 4 B is for accordinging to a kind of after light beam is via the scattering pattern with different scattering particle particle diameters of the embodiment of the invention, and from the light intensity distributions curve map of light conductor first surface outgoing, wherein the scope of rising angle θ is to+90 degree from-90 degree.Please, illustrate the light shape of pairing emerging beam when the particle diameter of scattering particle is respectively 1 micron (micron, μ m), 15 microns (μ m), 30 microns (μ m) among the figure with reference to 4B.Shown in Fig. 4 B, when the particle diameter of scattering particle was 1 micron, rising angle θ had bigger light intensity when 0 spends, and in other words, emerging beam has higher light directive property.On the other hand, when the particle diameter of scattering particle was 15 microns, the light intensity distributions when being 1 micron with the particle diameter of scattering particle was compared, and the light intensity distributions when its particle diameter is 15 microns is comparatively even.Please continue the A with reference to Fig. 4, when the particle diameter of scattering particle was 30 microns, the light intensity distributions of light beam after via this scattering pattern can be further by homogenising.

In other words; When the particle diameter of scatteringparticle 156 hour, can promote the light directive property oflight beam 112 after, but when the size of scatteringparticle 156 is close with visible wavelength viascattering pattern 152; Have the tendency of a little light energy losses, and the light utilization ratio is reduced.On the other hand, when the particle diameter of scatteringparticle 156 is big, then can promote the light utilization ratio oflight beam 112 after via scattering pattern 152.What deserves to be mentioned is that in the present embodiment, light directive property and light utilization ratio after the particle diameter of scatteringparticle 156 equals 2 microns in fact, can makelight beam 112 via scatteringpattern 152 reach optimum efficiency.

In addition; On the basis of the bright dipping light shape of adjustinglight beam 112 throughscattering pattern 152; On other design is considered; The refractive index of scatteringpattern 152 can be further adjusted according to the refractive index of the ratio of scatteringparticle 156 andresin combination 154, scatteringparticle 156 itself and the refractive index ofresin combination 154, when changing bright dipping light shape, further to promote the light utilization ratio of light beam.In the present embodiment; The refractive index oflight conductor 131 for example is 1.49; Thescattering pattern 152 that is arranged in its second surface P2 is based on the viewpoint that improves light utilization efficiency; The refractive index ofresin combination 154 is preferably between 1.4 to 1.55 scope, and preferred in fact 1.4 to 1.7 the scope of the refractive index of scatteringparticle 156.

On making, above-mentioneddiffusing structure 150 printing process capable of using are made.More detailed, can earlierresin combination 154, scatteringparticle 156 be formed scattering material with solvent.Then, this scattering material for example is sprayed on thelight conductor 131 through printing process.And; Remove solvent via curing process and be sprayed at the scattering material on thelight conductor 131 with curing; Form the diffusingstructure 150 that is made up of a plurality ofscattering pattern 152 separated from one another thus, wherein curing process is for example smoked journey for ultraviolet light polymerization processing procedure or heat.Therefore, solvent can be selected the solvent of suitable material and viscosity according to the printing process of reality for use, for instance; In the present embodiment; Solvent for example be by 90% 3,5,5-trimethyl-2-cyclohexene-1-ketone (3; 5,5-trimethyl-2-cyclohexene-1-one) and the potpourri that 10% 4-methyl-3-amylene-2-ketone (4-methyl-3-penten-2-one) is formed.

Below will be to theresin combination 154 andscattering particle 156 further explains that form in the above-mentioned scattering pattern 152:

Resin combination: based on the viewpoint of light utilization ratio; The resin combination material is chosen in the material that has high light transmittance in the visible-range in an embodiment; For example the light transmittance of resin combination in visible-range be more than or equal to 90%, and the resin combination in the scattering pattern for example is the printing opacity ink lay.Particularly; Constituent in order to form resin combination comprises polymethylmethacrylate (poly methylmethacrylate resin), and the constituent that forms resin combination in the present embodiment more comprises aromatic hydrocarbons (aromatic hydrocarbon), dibasic ester (dibasic ester), cyclohexanone and silicon dioxide.

Has viewpoint such as light transmission and better light utilization ratio preferably from resin combination; The content that forms each compound in the constituent of resin combination for example satisfies following relationship: the content of polymethylmethacrylate in resin combination for example has 20-30 percentage by weight, cyclohexanone and in resin combination, has the 10-20 percentage by weight for 20-30 percentage by weight, aromatic hydrocarbons have 20-30 percentage by weight, dibasic ester in resin combination in resin combination, and the content of silicon dioxide in resin combination is smaller or equal to 10 percentage by weights.

Scattering particle: so-called scattering particle, be meant that the light beam that can make after the incident produces different light direction even-granular materials, wherein the particle diameter of scattering particle for example is 1 micron to 30 microns, selecting for use and the consideration of refractive index such as aforementioned of its particle diameter repeated no more.Particularly, the composition of scattering particle can be a kind of in titania, silicon dioxide, the polymethylmethacrylate, or their combination, but not as limit, also can select other scattering particle in other embodiments for use.

It should be noted that; The constituent that satisfies above-mentioned relation is mixed the effect that the formedscattering pattern 152 in back has the bright dipping light shape of abundant changelight beam 112 with scatteringparticle 156; And have light utilization ratio preferably, make thelight element 130 of using thisscattering pattern 152 have the effect of homogenising light intensity distributions.Thus; Compare with known optical touch control apparatus; The optical touch control apparatus utilization of embodiments of the invention has thescattering pattern 152 ofresin combination 154 andscattering particle 156; Andresin combination 154 andscattering particle 156 satisfy particular kind of relationship, can promote the optical uniformity of light beam vialight element 130 back outgoing to sensing space thus, thereby promote the accuracy of judgement degree of optical touch control apparatus for touch point.

In sum; Embodiments of the invention have following one of them advantage at least; Because the optical touch control apparatus of the present invention's embodiment and optical touch control display device adopt lambert's light scattering structure; So that be similar to lambert's light intensity distributions by the light shape of the light beam of first surface outgoing, so the uniformity coefficient of the briliancy of the detected first surface of photodetector is preferable, and then promotes optical touch control apparatus and the optical touch control display device accuracy of judgement degree for touch points.

The above person; Be merely the preferred embodiments of the present invention; Can not limit the scope of the present invention's enforcement with this, promptly allly change and modify, all still belong in the scope that application of the present invention contains according to claims of the present invention and the simple equivalent done of invention description.Arbitrary embodiment of the present invention in addition or application range must not reached whole purposes or advantage or the characteristics that the present invention discloses.In addition, summary part and title only are to be used for auxiliary patent document retrieval usefulness, are not to be used for limiting interest field of the present invention.

Claims (18)

1. optical touch control apparatus that is applicable to display surface, said optical touch control apparatus comprises:

At least one light source is configured in by the said display surface, and is suitable for providing light beam;

At least one light element is configured in by the said display surface, and is configured on the bang path of said light beam, and said light element comprises:

Light conductor; Have first surface, be connected the 3rd surface of said incidence surface, said first surface and said second surface with respect to the second surface of said first surface, the said first surface of at least one connection with the incidence surface, of said second surface; And with respect to said the 3rd surface and connect the 4th surface of said incidence surface, said first surface and said second surface; Wherein said light beam is suitable for getting in the said light conductor via said incidence surface, and is suitable for being passed to the sensing space before the said display surface from said first surface; And

Lambert's light scattering structure; Be configured at least one surface in said second surface, said the 3rd surface and said the 4th surface; So that said beam divergence is to said first surface, and make light intensity be less than or equal to 0.2 with the root-mean-square value of the difference of the light intensity of each corresponding rising angle of lambert's normalization light intensity distributions curve by each rising angle of the normalization light intensity distributions curve of the light beam of said first surface outgoing; And

At least one photodetector is configured in by the said display surface, in order to the intensity variation of the said light beam of sensing in said sensing space, wherein,

Said at least one light element is three light elements; Said at least one light source is four light sources; On the adjacent both sides that first light element in said three light elements and second light element are configured in said display surface respectively; On the adjacent both sides that said second light element in said three light elements and the 3rd light element are configured in said display surface respectively; Said first light element and said the 3rd light element are configured in respectively on the relative both sides of said display surface; Said first light element is configured on the bang path of the said light beam that first light source in said four light sources sent; Said second light element is configured on the bang path of the said light beam that the said light beam that secondary light source sent and the 3rd light source in said four light sources sent, and said the 3rd light element is configured on the bang path of the said light beam that the 4th light source in said four light sources sent.

2. optical touch control apparatus as claimed in claim 1, wherein said lambert's light scattering structure comprise a plurality of lambert's light scattering patterns that separate each other, and each lambert's light scattering pattern comprises:

The printing opacity ink lay; And

A plurality of scattering particles are entrained in the said printing opacity ink lay.

3. optical touch control apparatus as claimed in claim 2, the ratio of the percentage by weight of the percentage by weight of wherein said scattering particle and said printing opacity ink lay is more than or equal to 0.1 and smaller or equal to 1.5.

4. optical touch control apparatus as claimed in claim 1; Also comprise processing unit; Said processing unit is electrically connected to said photodetector; Wherein when touch object got into said sensing space, said processing unit determined the position of said touch object with respect to said display surface according to said intensity variation.

5. optical touch control apparatus as claimed in claim 1; Wherein said lambert's light scattering structure comprises a plurality of lambert's light scattering patterns that separate each other, said lambert's light scattering pattern near the number density at said light source place less than said lambert's light scattering pattern in number density away from said light source place.

6. optical touch control apparatus as claimed in claim 1, wherein said lambert's light scattering structure comprise a plurality of lambert's light scattering patterns that separate each other, and said lambert's light scattering pattern is along arranging perpendicular to the direction of said incidence surface in fact.

7. optical touch control apparatus as claimed in claim 1, wherein said light conductor also comprises reverberator, is configured in said second surface, said the 3rd surface and said the 4th surface at least one surface.

8. optical touch control apparatus as claimed in claim 1; At least one incidence surface of the said light conductor of wherein said second light element is two incidence surfaces respect to one another; Said secondary light source and said the 3rd light source are configured in respectively by said two relative incidence surfaces; Said lambert's light scattering structure comprises a plurality of lambert's light scattering patterns that separate each other, said lambert's light scattering pattern near the number density at said two incidence surface places less than said lambert's light scattering pattern in number density near the point midway place between said two incidence surfaces.

9. optical touch control apparatus as claimed in claim 1; The said first surface of wherein said light element is towards said sensing space; Said at least one photodetector is two photodetectors; The said first surface of said first light element and the said first surface of said second light element are arranged in the sensing range of a photodetector of said two photodetectors, and the said first surface of the said first surface of said second light element and said the 3rd light element is arranged in another sensing range of said two photodetectors.

10. optical touch control display device comprises:

Display, said display has display surface; And

Optical touch control apparatus comprises:

At least one light source is configured in by the said display surface, and is suitable for providing light beam;

At least one light element is configured in by the said display surface, and is configured on the bang path of said light beam, and said light element comprises:

Light conductor; Have first surface, be connected the 3rd surface of said incidence surface, said first surface and said second surface with respect to the second surface of said first surface, the said first surface of at least one connection with the incidence surface, of said second surface; And one with respect to said the 3rd surface and connect the 4th surface of said incidence surface, said first surface and said second surface; Wherein said light beam is suitable for getting in the said light conductor via said incidence surface, and is suitable for being passed to the sensing space before the said display surface from said first surface; And

Lambert's light scattering structure; Be configured in said second surface, said the 3rd surface and said the 4th surface at least one surface; So that said beam divergence is to said first surface, and make light intensity be less than or equal to 0.2 with the root-mean-square value of the difference of the light intensity of each corresponding rising angle of lambert's normalization light intensity distributions curve by each rising angle of the normalization light intensity distributions curve of the light beam of said first surface outgoing; And

At least one photodetector is configured in by the said display, in order to the intensity variation of the said light beam of sensing in said survey sensing space, wherein,

Said at least one light element is three light elements; Said at least one light source is four light sources; On the adjacent both sides that first light element in said three light elements and second light element are configured in said display surface respectively; On the adjacent both sides that said second light element in said three light elements and the 3rd light element are configured in said display surface respectively; Said first light element and said the 3rd light element are configured in respectively on the relative both sides of said display surface; Said first light element is configured on the bang path of the said light beam that first light source in said four light sources sent; Said second light element is configured on the bang path of the said light beam that the said light beam that secondary light source sent and the 3rd light source in said four light sources sent, and said the 3rd light element is configured on the bang path of the said light beam that the 4th light source in said four light sources sent.

11. optical touch control display device as claimed in claim 10, wherein said lambert's light scattering structure comprise a plurality of lambert's light scattering patterns that separate each other, each said lambert's light scattering pattern comprises:

The printing opacity ink lay; And

A plurality of scattering particles are entrained in the said printing opacity ink lay.

12. optical touch control display device as claimed in claim 11, the ratio of the percentage by weight of the percentage by weight of wherein said scattering particle and said printing opacity ink lay is more than or equal to 0.1 and smaller or equal to 1.5.

13. optical touch control display device as claimed in claim 10; Wherein said optical touch control apparatus also comprises processing unit; Said processing unit is electrically connected to said photodetector; Wherein when touch object got into said sensing space, said processing unit determined the position of said touch object with respect to said display surface according to said intensity variation.

14. optical touch control display device as claimed in claim 10; Wherein said lambert's light scattering structure comprises a plurality of lambert's light scattering patterns that separate each other, said lambert's light scattering pattern near the number density at said light source place less than said lambert's light scattering pattern in number density away from said light source place.

15. optical touch control display device as claimed in claim 10, wherein said lambert's light scattering structure comprise a plurality of lambert's light scattering patterns that separate each other, said lambert's light scattering pattern is along arranging perpendicular to the direction of said incidence surface in fact.

16. optical touch control display device as claimed in claim 10, wherein said light conductor also comprises reverberator, and it is configured in said second surface, said the 3rd surface and said the 4th surface at least one surface.

17. optical touch control display device as claimed in claim 10; At least one incidence surface of the said light conductor of wherein said second light element is two incidence surfaces respect to one another; Said secondary light source and said the 3rd light source are configured in respectively by said two relative incidence surfaces; Said lambert's light scattering structure comprises a plurality of lambert's light scattering patterns that separate each other, said lambert's light scattering pattern near the number density at said two incidence surface places less than said lambert's light scattering pattern in number density near the point midway place between said two incidence surfaces.

18. optical touch control display device as claimed in claim 10; The said first surface of wherein said light element is towards said sensing space; Said at least one photodetector is two photodetectors; The said first surface of said first light element and the said first surface of said second light element are arranged in the sensing range of a photodetector of said two photodetectors, and the said first surface of the said first surface of said second light element and said the 3rd light element is arranged in the sensing range of another photodetector of said two photodetectors.

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