CN101963870A - Light guide column with light weakening structure and optical touch device thereof - Google Patents
Light guide column with light weakening structure and optical touch device thereof Download PDFInfo
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- CN101963870A CN101963870A CN 201010265532 CN201010265532A CN101963870A CN 101963870 A CN101963870 A CN 101963870A CN 201010265532 CN201010265532 CN 201010265532 CN 201010265532 A CN201010265532 A CN 201010265532A CN 101963870 A CN101963870 A CN 101963870A
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Abstract
The invention discloses a light guide column and an optical touch device thereof. The light guide column comprises a column body and a light weakening layer, wherein the column body is provided with a light-entering end face and a light-emitting surface adjacently connected to the light-entering end face, and the light weakening layer is arranged in a preset region on the light-emitting surface. The optical touch device comprises an indication region, a light source module and the light guide column, wherein the light guide column is arranged at the side edge of the indication region, and the light source module is connected to the light-entering end face of the light guide column to ensure that light emitted from the light source module enters the column body from the light-entering end face. Therefore, the light emitted out of the column body from the preset region can penetrate through the light weakening layer to be weakened, thus the phenomenon that the touch position is judged wrongly due to extremely strong intensity of background light, which is caused by the emitted light of the light-emitting surface adjacent to the uneven surface of the light source module or the column body, can be avoided.
Description
Technical field
The present invention refers to a kind of leaded light post and optical touch control apparatus thereof with dim light structure especially about a kind of leaded light post and optical touch control apparatus.
Background technology
In recent years, because the image display technique is constantly progressive, the touch screen can directly see through the advantage that the way of contact is imported because have, become common on the market now a kind of display device, and be widely used in each electronic product, for example ATM (Automatic Teller Machine), point-of-sale terminals, visitor's guide system or industrial control system etc.In the field of optical touch control apparatus, image with the acquisition touch area is arranged as judging the position of touch person, it utilizes indicant (for example user's finger) to cover the zone that bias light changes with detecting image in picked image, and then as the basis of calculating position of touch.
In actual applications, aforementioned bias light forms with light source collocation light conducting member usually, after light enters light conducting member, penetrates light conducting member again behind mixed light.From this light conducting member in the light that penetrates near the light source place with from the relative light that penetrates away from the light source place, its both travel angle and intensity are all different, the intensity of the light of feasible whole exiting surface ejaculation from this light conducting member is inhomogeneous.In principle, the accessible light intensity of the Image Sensor of optical touch control apparatus is in certain scope, yet aforesaid non-uniform phenomenon causes the intensity of the light that penetrates near the light source place too high, when causing the touch-control behavior to take place, corresponding image signal deficient change is differentiated Image Sensor, and then causes the position of touch misjudgment.Though the light source major part is arranged at the corner more, little to the programmable scope influence in touch area, be that the programmable scope in touch area is limited to some extent really.
Except the intensity of the aforementioned light that causes ejaculation because of light travel angle and path length is inhomogeneous, if form uneven surface on the light conducting member, so that has the inclined-plane that can make light reflection in the light conducting member and penetrate light conducting member, the light that penetrates from the exiting surface near this place will be increased, even the also corresponding light intensity that should locate strengthens, and is to cause uneven phenomenon equally.When the light intensity that strengthens exceeded the accessible scope of Image Sensor of optical touch control apparatus, the wrongheaded situation of aforementioned position of touch still may take place.The degree that the reflection of aforementioned inclined-plane causes light intensity to strengthen is relevant near the light intensity it, so more near light source, the influence that aforementioned inclined-plane causes is just bigger.Because this ramp structure must not be close to light source, aforementioned affect may occur in the one segment distance place from the edge, touch area, so the programmable scope in touch area certainly will be subjected to the restriction of certain degree, and then influences the application of touch controllable function.
Summary of the invention
One of purpose of the present invention is to provide a kind of leaded light post, and it has the dim light structure, selectively weakens the intensity of the light that penetrates from this leaded light post, and it can be fallen within the accessible scope.
Leaded light post of the present invention comprises cylinder and dim light layer.This cylinder has the light inlet end face and in abutting connection with the exiting surface of this light inlet end face, this dim light layer is arranged at the presumptive area on this exiting surface.By this, this presumptive area is launched the light of this cylinder certainly, can pass this dim light layer being weakened, and then its intensity can fall within this accessible scope.
According to leaded light post of the present invention, this presumptive area is positioned at contiguous this light inlet end on this exiting surface.
Also comprise fixed sturcture according to leaded light post of the present invention, be located on this cylinder, wherein this presumptive area is positioned on this exiting surface corresponding to this fixed sturcture place.
According to leaded light post of the present invention, this dim light layer has the gradual change penetrability, and this gradual change penetrability extremely increases progressively away from this light inlet end near this light inlet end in this presumptive area relatively relatively.
According to leaded light post of the present invention, this dim light layer comprises first dim light zone and the second dim light zone, this first dim light zone and this second dim light zone adjacency, this first dim light zone this light inlet end face of relative proximity and this second dim light zone are relatively away from this light inlet end face, and the penetrability in this second dim light zone is greater than the penetrability in this first dim light zone.
According to leaded light post of the present invention, this dim light layer is pattern printed layers or neutral density filter.
According to leaded light post of the present invention, this dim light layer comprises a plurality of light tight points, and the distribution density of these a plurality of light tight points is extremely successively decreased away from this light inlet end near this light inlet end in this presumptive area relatively relatively.
According to leaded light post of the present invention, this light inlet end face and this exiting surface are along an axial adjacency, this dim light layer comprises a plurality of light tight stripeds, these a plurality of stripeds are parallel to haply that this is axial, and between between these a plurality of stripeds apart from this presumptive area relatively near this light inlet end to increasing progressively away from this light inlet end relatively.
Also comprise infrared filter according to leaded light post of the present invention, be arranged on this exiting surface of this cylinder, wherein this dim light layer is arranged at this presumptive area on this infrared filter.
Another object of the present invention is to provide a kind of optical touch control apparatus, it comprises leaded light post of the present invention, also selectively weakens the intensity of the light that penetrates from this leaded light post, and it can be fallen within the accessible scope, avoids the position of touch misjudgment.
Optical touch control apparatus of the present invention comprises indicating area, light source module and this leaded light post.This indicating area has side, this cylinder of this leaded light post be arranged at this side so that this exiting surface towards this indicating area, this light source module connects this light inlet end face so that the light of this light source module emission enters this cylinder via this light inlet end face.By this, this presumptive area is launched the light of this cylinder towards this indicating area certainly, can pass this dim light layer being weakened, and then its intensity can fall within this accessible scope, avoids the position of touch misjudgment.
Therefore, leaded light post of the present invention and have the optical touch control apparatus of this leaded light post can will penetrate from exiting surface, the intensity of the light by institute's predetermined zone weakens to allowable range, it is inhomogeneous to have solved in the known techniques bright dipping of leaded light post, even exceed accessible scope, cause position of touch to be easy to be judged wrong problem.
Description of drawings
Fig. 1 is the synoptic diagram of optical touch control apparatus according to a preferred embodiment of the present invention.
Fig. 2 is that the meaning diagrammatic sketch is amplified in the part of leaded light post and light source module.
Fig. 3 is the vertical view of dim light layer.
Fig. 4 is the vertical view according to the dim light layer of another embodiment.
Fig. 5 is the vertical view according to the dim light layer of another embodiment.
Fig. 6 is the partial perspective view according to the leaded light post of another preferred embodiment of the present invention.
Fig. 7 is the partial perspective view according to the leaded light post of another embodiment.
Fig. 8 amplifies the meaning diagrammatic sketch according to the part of the leaded light post of an embodiment and light source module.
Embodiment
For making purpose of the present invention, structure, feature and function thereof there are further understanding, cooperate embodiment to be described in detail as follows now.
See also Fig. 1, it is the synoptic diagram of optical touch control apparatus 1 according to a preferred embodiment of the present invention.Optical touch control apparatus 1 comprises indicating area 12, two light source modules 14, leaded light post 16 and two Image Sensors 18.Optical touch control apparatus 1 is integrated into display panel usually, and therefore aforementioned indicating area 12 can directly be defined on this display panel, and the indication range of the scope of indicating area 12 and this display panel is suitable.In present embodiment, indicating area 12 is rectangular and have a side 122.Leaded light post 16 is arranged at side 122, in order to provide the indicating area 12 bias lights.Light source module 14 is arranged at the distolateral of leaded light post 16, in order to light source to be provided.Image Sensor 18 is arranged at the corner with respect to the indicating area 12 of leaded light post 16, in order to the image in the acquisition indicating area 12.
See also Fig. 2, it is that leaded light post 16 amplifies the meaning diagrammatic sketch with the part of light source module 14.Leaded light post 16 comprises cylinder 162 and dim light layer 164.Cylinder 162 has light inlet end face 1622 and in abutting connection with the exiting surface 1624 of light inlet end face 1622, cylinder 162 be arranged at indicating area 12 side 122 so that exiting surface 1624 towards the indicating area 12.Light source module 14 connects light inlet end face 1622 so that the light of light source module 14 emissions enters cylinder 162 via light inlet end face 1622.Dim light layer 164 is arranged at the presumptive area 1626 on the exiting surface 1624, with so that from presumptive area 1626 towards the indicating area 12 light of launching cylinder 162, can pass dim light layer 164 to be weakened.In present embodiment, this presumptive area 1626 is positioned at contiguous light inlet end face 1622 places on the exiting surface 1624.
Enter the light in the cylinder 162, its travel path is illustrated with dotted line.More near light source module 14, the distance that light is advanced in cylinder 162 is short more, its strength retrogression is few more, from the light that penetrates near the exiting surface 1624 of light source module 14 more, its intensity is strong more, so in present embodiment, the presumptive area 1626 that is used for being provided with dim light layer 164 promptly designs at contiguous light inlet end face 1622 places, even in abutting connection with light inlet end face 1622, can effectively weaken the strong excessively ejaculation light of complete aforementioned intensity, and then avoid in the prior art penetrating light intensity and exceed accessible scope, and make position of touch be easy to be judged wrong problem.Dim light layer 164 is to use optical filter (for example neutral density filter or other optical filters) or utilizes pattern printed layers (coating that promptly has light tight pattern) to realize, it implements aspect as described later.
See also Fig. 3, it is the vertical view of dim light layer 164, that is the vertical view of the presumptive area 1626 of the cylinder 162 of leaded light post 16.Light inlet end face 1622 and exiting surface 1624 are along axial 1628 adjacency, and dim light layer 164 comprises a plurality of light tight stripeds, and it can utilize mode of printing to coat on the presumptive area 1626.It is axial 1628 that these a plurality of stripeds are parallel to haply, and these a plurality of interfringe spacings in presumptive area 1626 relatively near light inputting end face 1622 places to increasing progressively away from light inlet end face 1622 places relatively.The variation of this shading density is just in order to cooperate the Strength Changes of the original light that penetrates from presumptive area 1626, so that the light intensity after weakening all can fall in the accessible scope.
See also Fig. 4, it is the vertical view according to the dim light layer 164 of another embodiment.Be that with dim light layer 164 difference shown in Figure 3 in Fig. 4, dim light layer 164 is to replace aforementioned light tight striped with a plurality of light tight points, it also can utilize mode of printing to coat on the presumptive area 1626.The distribution density of a plurality of light tight points is extremely successively decreased away from light inlet end face 1622 places near light inputting end face 1622 places in presumptive area 1626 relatively relatively, can reach the effect of aforementioned light tight striped equally.No matter be light tight striped of printing or light tight point, its purpose is making dim light layer 164 have the gradual change penetrability, and this gradual change penetrability extremely increases progressively away from light inlet end face 1622 places near light inputting end face 1622 places in presumptive area 1626 relatively relatively.In like manner, in actual applications, the pattern of printing is not limit aforementioned parallel stripes, point-like etc., other geometric configuratioies, or arbitrary shape, figure all can; In principle, it is good presenting smooth change with the integral light-transmitting degree.
See also Fig. 5, it is the vertical view according to the dim light layer 164 of another embodiment.Be different from dim light layer 164 structure among Fig. 3 or Fig. 4, the dim light layer 164 of Fig. 5 comprises the 1630 and second dim light zone 1632, first dim light zone, 1630 and second dim light zone, first dim light zone, 1632 adjacency, first dim light zone 1630 relative proximity light inlet end faces 1622 and the second dim light zone 1632 are relatively away from light inlet end face 1622.In present embodiment, realize with the less a plurality of light tight striped of spacing in the first dim light zone 1630,1632 in second dim light zone realizes with the bigger a plurality of light tight striped of spacing, makes the penetrability in the second dim light zone 1632 greater than the penetrability in the first dim light zone 1630.Similarly, the light tight striped of dim light layer 164 can also replace by light tight point among Fig. 5, needless to say gives unnecessary details.
Supplementary notes be, though the penetrability of dim light layer 164 is not a gradual change among Fig. 5, this design can be simplified dim light layer 164 processing procedure, for example attaches with the optical filter of different penetrabilitys to get final product, increase processing procedure stability also promotes production reliability.Consider at the same time under the requirement to penetrability gradual change and processing procedure simplification, dim light layer 164 can be distinguished more dim light zone again among Fig. 5, the penetrability in each dim light zone is all different, also can make the integral light-transmitting degree of dim light layer 164 present the asymptotic variation of limited exponent number.
Since the intensity of the light that penetrates from exiting surface 1624 not only with its distance dependent of in cylinder 162, advancing, also relevant with the amount of the light that penetrates.See also Fig. 6, it is the partial perspective view according to the leaded light post 16 of another preferred embodiment of the present invention.Leaded light post 16 more comprises fixed sturcture 166, is located on the cylinder 162.Leaded light post 16 is fixed in by fixed sturcture 166 on the framework of optical touch control apparatus 1, and wherein presumptive area 1626 is positioned on the exiting surface 1624 corresponding to fixed sturcture 166 places.As shown in Figure 6, fixed sturcture 166 has inclined-plane 1662, its to the reflectometry of the light in the cylinder 162 in fact towards the presumptive area 1626 of exiting surface 1624, making can be from presumptive area 1626 ejaculation cylinder 162 through the part light of these inclined-plane 1662 internal reflections, that is the amount of the light that penetrates near zone of the amount of the light that penetrates from presumptive area 1626 comes manyly, so the bias light intensity of its Image Sensor 18 sensings is also stronger.Obvious this because of forming the problem that uneven surface also can cause bias light intensity to increase on the leaded light post 16, therefore among aforementioned each embodiment,, also have suitablely in this about the explanation of dim light layer 164, repeat no more.
Supplementary notes be, though inclined-plane 1662 appears at the fixed sturcture 166 that protrudes in cylinder 162 among Fig. 6, in utilize sunk structure as fixed sturcture in, the phenomenon that also has aforementioned inclined-plane 1662 produces.See also Fig. 7, it is the partial perspective view according to the leaded light post 16 of another embodiment.Leaded light post 16 also comprises fixed sturcture 167 among Fig. 7, and it is for being depressed in cylinder 162.Fixed sturcture 167 has inclined-plane 1672 equally, and it to also being in fact towards the presumptive area 1626 of exiting surface 1624, so also will produce the problem as inclined-plane among Fig. 6 1662, so also has the demand that dim light layer 164 is set to the reflectometry of the light in the cylinder 162.About the explanation of dim light layer 164 among Fig. 7, can consult among aforementioned each embodiment about the explanation of dim light layer 164, repeat no more.Again, presumptive area 1626 among Fig. 6 and Fig. 7 is over against fixed sturcture 166,167, this is vertical because of inclined- plane 1662,1672 parallel columns 162, so if inclined- plane 1662,1672 and cylinder 162 vertically between angle is arranged, then fixed sturcture 166,167 meetings corresponding with it of the position of presumptive area 1626 are offset to some extent.
The light of optical touch control apparatus institute sensing does not exceed with visible light, disturbs the problem of display light source if can avoid the touch-control light source with the invisible light for the image light source, also can avoid Photosensing Units to be subjected to the influence of surround lighting.Therefore, optical touch control apparatus 1 can comprise infrared filter again among Fig. 1, in order to filter out infrared ray as the image light source.See also Fig. 8, it is according to the leaded light post 16 of an embodiment and the part amplification meaning diagrammatic sketch of light source module 14.Infrared filter 168 is arranged on the exiting surface 1624 of cylinder 162, and wherein dim light layer 164 is arranged at the presumptive area 1626 on the infrared filter 168.The explanation of dim light layer 164 can be consulted among aforementioned each embodiment about the explanation of dim light layer 164 among Fig. 8, repeats no more.
Compared to prior art, leaded light post of the present invention and have the optical touch control apparatus of this leaded light post can will penetrate from exiting surface, the intensity of the light by institute's predetermined zone weakens to allowable range, solved in the known techniques no matter be because of the irradiant intensity near light source stronger, or cause irradiant amount higher because of fixed sturcture, or be the superposition of aforementioned both phenomenons, and cause the bright dipping of leaded light post inhomogeneous, even exceed accessible scope, cause position of touch to be easy to be judged wrong problem.
The present invention is described by above-mentioned related embodiment, yet the foregoing description is only for implementing example of the present invention.Must be pointed out that the embodiment that has disclosed does not limit the scope of the invention.On the contrary, change of being done and retouching without departing from the spirit and scope of the present invention all belongs to scope of patent protection of the present invention.
Claims (10)
1. leaded light post is characterized in that comprising:
Cylinder has the light inlet end face and in abutting connection with the exiting surface of this light inlet end face; And
The dim light layer is arranged at the presumptive area on this exiting surface.
2. leaded light post as claimed in claim 1 is characterized in that this presumptive area is positioned at contiguous this light inlet end on this exiting surface.
3. leaded light post as claimed in claim 1 is characterized in that also comprising fixed sturcture, is located on this cylinder, and wherein this presumptive area is positioned on this exiting surface corresponding to this fixed sturcture place.
4. leaded light post as claimed in claim 1 is characterized in that this dim light layer has the gradual change penetrability, and this gradual change penetrability extremely increases progressively away from this light inlet end near this light inlet end in this presumptive area relatively relatively.
5. leaded light post as claimed in claim 1, it is characterized in that this dim light layer comprises first dim light zone and the second dim light zone, this first dim light zone and this second dim light zone adjacency, this first dim light zone this light inlet end face of relative proximity and this second dim light zone are relatively away from this light inlet end face, and the penetrability in this second dim light zone is greater than the penetrability in this first dim light zone.
6. leaded light post as claimed in claim 1 is characterized in that this dim light layer is pattern printed layers or neutral density filter.
7. leaded light post as claimed in claim 1 is characterized in that this dim light layer comprises a plurality of light tight points, and the distribution density of these a plurality of light tight points is extremely successively decreased away from this light inlet end near this light inlet end in this presumptive area relatively relatively.
8. leaded light post as claimed in claim 1, it is characterized in that this light inlet end face and this exiting surface are along an axial adjacency, this dim light layer comprises a plurality of light tight stripeds, these a plurality of stripeds are parallel to that this is axial, and these a plurality of interfringe spacings in this presumptive area relatively near this light inlet end to increasing progressively away from this light inlet end relatively.
9. leaded light post as claimed in claim 1 is characterized in that also comprising infrared filter, is arranged on this exiting surface of this cylinder, and wherein this dim light layer is arranged at this presumptive area on this infrared filter.
10. optical touch control apparatus is characterized in that comprising:
The indicating area has side;
As each described leaded light post among the claim 1-9, this cylinder be arranged at this side so that this exiting surface towards this indicating area; And
The light source module connects this light inlet end face so that the light of this light source module emission enters this cylinder via this light inlet end face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010265532 CN101963870A (en) | 2010-08-20 | 2010-08-20 | Light guide column with light weakening structure and optical touch device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010265532 CN101963870A (en) | 2010-08-20 | 2010-08-20 | Light guide column with light weakening structure and optical touch device thereof |
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| CN101963870A true CN101963870A (en) | 2011-02-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010265532 Pending CN101963870A (en) | 2010-08-20 | 2010-08-20 | Light guide column with light weakening structure and optical touch device thereof |
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| CN (1) | CN101963870A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102855021A (en) * | 2011-06-27 | 2013-01-02 | 原相科技股份有限公司 | Optical touch control device |
| CN103399428A (en) * | 2013-03-08 | 2013-11-20 | 友达光电股份有限公司 | Display device |
| US9383253B2 (en) | 2011-06-15 | 2016-07-05 | Pixart Imaging Inc. | Optical touch device having a plurality of light guide components each with an acute angle between light emitting surfaces |
| CN113589972A (en) * | 2021-08-19 | 2021-11-02 | 业成科技（成都）有限公司 | Light emitting diode screen display structure and light emitting diode display unit set thereof |
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| CN1892345A (en) * | 2005-07-05 | 2007-01-10 | 久禾光电股份有限公司 | Lighting module group capable of eliminating bright spots |
| CN101770306A (en) * | 2008-12-31 | 2010-07-07 | 华硕电脑股份有限公司 | Touch control plate and electronic device |
| CN201636689U (en) * | 2010-02-09 | 2010-11-17 | 三和企业股份有限公司 | Light guide module |
| CN102043542A (en) * | 2009-10-15 | 2011-05-04 | 中强光电股份有限公司 | Optical touch device, optical touch display device and light source module |
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| JPH11149817A (en) * | 1997-11-18 | 1999-06-02 | Nissha Printing Co Ltd | Surface emitting device |
| CN1892345A (en) * | 2005-07-05 | 2007-01-10 | 久禾光电股份有限公司 | Lighting module group capable of eliminating bright spots |
| CN101770306A (en) * | 2008-12-31 | 2010-07-07 | 华硕电脑股份有限公司 | Touch control plate and electronic device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9383253B2 (en) | 2011-06-15 | 2016-07-05 | Pixart Imaging Inc. | Optical touch device having a plurality of light guide components each with an acute angle between light emitting surfaces |
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| CN102855021B (en) * | 2011-06-27 | 2015-05-13 | 原相科技股份有限公司 | Optical touch control device |
| CN103399428A (en) * | 2013-03-08 | 2013-11-20 | 友达光电股份有限公司 | Display device |
| CN113589972A (en) * | 2021-08-19 | 2021-11-02 | 业成科技（成都）有限公司 | Light emitting diode screen display structure and light emitting diode display unit set thereof |
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Open date: 20110202 |