CN102375616B - Optical contact control structure - Google Patents
Optical contact control structure Download PDFInfo
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- CN102375616B CN102375616B CN201010260698.2A CN201010260698A CN102375616B CN 102375616 B CN102375616 B CN 102375616B CN 201010260698 A CN201010260698 A CN 201010260698A CN 102375616 B CN102375616 B CN 102375616B
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Abstract
The invention discloses an optical contact control structure, which comprises a light transmitting element, a light source, a reflector and an image sensor. The light transmitting element has a light leaving surface. The light source is arranged close to the light transmitting element. The light transmitting element guides the light rays emitted by the light source to exit from the light leaving surface. The reflector is arranged on one side of the light transmitting element, and the extension direction of the reflector is actually vertical to the light leaving surface. The crossing position of the light transmitting element and the reflector is defined as a first position, and the light transmitting element and the reflector define a contact control range. The image sensor is arranged at a second position corresponding to the first position, and the sensing range of the image sensor at least covers a contact control range. When the advancing path of light rays in the first advancing direction of the image sensor is shorter than the advancing path of the light rays in the second advancing direction of the image sensor through the reflector, the intensity of the light rays in the second direction is greater than that of light rays in the first direction.
Description
Technical field
The present invention relates to a kind of touch-control structure, and particularly relate to a kind of optical contact control structure.
Background technology
Please refer to Fig. 1, it illustrates the vertical view of existing optical contact control structure 100.Existing optical contact control structure 100 comprises three light source groups 102 and two image sensor 103.Light source group 102 is in order to produce uniform source of light, and these three light source groups 102 surround touch-control scope 101.These two image sensor 103 are respectively arranged at the only position of a contiguous light source group 102, with difference sensing touch-control scope 101.In the time that touch-control carries out, in touch-control scope 101, there will be a touch point 104, image sensor 103 can become a dim spot by sensing for touch point 104.By these two angle θ that image sensor 103 senses respectively
1, θ
2and the long L of touch-control scope 101 and wide H, and then calculate the position (x, y) of touch point 104 in touch-control scope 101.
But so the quantity of the needed light source group 102 of touch-control structure 100 and image sensor 103 is too much, can cause too high cost, overweight construction weight and excessive energy resource consumption.
Summary of the invention
The object of the invention is to a kind of optical touch control apparatus, use less light-guide device, light source and image sensor, and the light of the sensing range of homogenising image sensor, and therefore promote the sensing accuracy of image sensor.
According to an aspect of the present invention, propose a kind of optical contact control structure, comprise light-guide device, light source, catoptron and image sensor.Light-guide device has exiting surface, and light source setting is adjacent to light-guide device, and the light that light-guide device guiding light source produces penetrates from exiting surface.Mirror arrangement is in a side of light-guide device, and the bearing of trend of catoptron is vertical with exiting surface in fact, and light-guide device and catoptron intersection are defined as primary importance, and light-guide device and catoptron limit touch-control scope.Image sensor is arranged at the second place with respect to primary importance, and the sensing range of image sensor is at least contained touch-control scope.Wherein, the bright dipping point on the exiting surface of light-guide device penetrates the first direction light advancing toward image sensor, and penetrates the second direction light advancing toward image sensor through catoptron.In the time that the travel path of first direction light is less than the travel path of second direction light, the light intensity of second direction light is greater than the light intensity of first direction light.
For foregoing of the present invention can be become apparent, a preferred embodiment cited below particularly, and coordinate appended accompanying drawing, be described in detail below:
Brief description of the drawings
Fig. 1 is the vertical view of the optical contact control structure of background technology;
Fig. 2 A is the vertical view of the optical contact control structure of first embodiment of the invention;
Fig. 2 B is the optical contact control structure of the first embodiment of the invention vertical view in touch-control state;
Fig. 3 A is the vertical view of the optical contact control structure of second embodiment of the invention;
Fig. 3 B is the vertical view of the light-guide device of second embodiment of the invention;
Fig. 3 C is the vertical view of the beam splitter layer of second embodiment of the invention;
The light splitting schematic diagram of the spectrophotometric unit that Fig. 3 D Fig. 3 E, Fig. 3 F are second embodiment of the invention.
Main element symbol description
100: existing optical contact control structure
101: touch-control scope
102: light source group
103: image sensor
200,300: optical contact control structure
201: touch-control scope
201a: reflection touch-control scope
202,302: light-guide device
202a, 302a: exiting surface
202b, 302b: go out luminous point
203,303: image sensor
204: touch point
204a: reflection touch point
205,305,210: light source
206,306: catoptron
207,307: primary importance
208: the second place
209: the second light-guide devices
302c: guide layer
302d: collimation layer
302e: beam splitter layer
311: spectrophotometric unit
311a: the first plane
311b: the second plane
D1: first direction light
D2: second direction light
L1, L2: light travel path
L: long
H: wide
θ
1, θ
2: angle
θ
d: the first rising angle
θ
m: the second rising angle
Embodiment
Following examples will illustrate according to the embodiment of optical contact control structure of the present invention, but the content that embodiment proposes, the use only illustrating for the present invention, is not the use as limit protection domain of the present invention.
The first embodiment
Please refer to Fig. 2 A, it is the vertical view illustrating according to the optical contact control structure 200 of first embodiment of the invention.The optical contact control structure 200 of the present embodiment comprises light-guide device 202, light source 205, catoptron 206 and image sensor 203.Light-guide device 202 has exiting surface 202a, and the contiguous light-guide device 202 of light source 205 arranges.Light-guide device 202 guides the light that light source 205 produces to penetrate from exiting surface 202a.Catoptron 206 is disposed at a side of light-guide device 202, and the bearing of trend of catoptron 206 is vertical with exiting surface 202a in fact.Light-guide device 202 is defined as primary importance 207 with catoptron 206 intersections, and light-guide device 202 limits touch-control scope 201 with catoptron 206.Image sensor 203 is arranged at the second place 208 with respect to primary importance 207, and the sensing range of image sensor 203 is at least contained touch-control scope 201.
The luminous point 202b that goes out on the exiting surface 202a of light-guide device 202 penetrates the first direction light D1 (representing with solid line in as Fig. 2 A) advancing toward image sensor 203, and penetrate and pass through the second direction light D2 (as represented with solid line in Fig. 2 A) that catoptron 206 advances toward image sensor 203, in the time that the travel path of first direction light D1 is less than the travel path of second direction light D2, the light intensity of second direction light D2 is greater than the light intensity of first direction light D1.
In order to allow in the time that the travel path of first direction light D1 is less than the travel path of second direction light D2, the light intensity of second direction light D2 is greater than the light intensity of first direction light D1, can, by allowing the light that light source 205 penetrates irradiate towards the direction of catoptron 206, just can make the light intensity of second direction light D2 be greater than the light intensity of first direction light D1.
In the present embodiment, optical contact control structure 200 more comprises light-guide device 209 and light source 210, light-guide device 209 is arranged at the position with respect to catoptron 206 in touch-control scope 201, and is adjacent to the second place 208 and light-guide device 202, and the contiguous light-guide device 209 of light source 210 arranges.Wherein, light source 205 and light source 210 are not limited to one, also can use multiple light sources 205 and multiple light source 205.
In the present embodiment, owing to using than the number of existing optical contact control structure image sensor, light-guide device and light source still less, therefore can reduce required cost, alleviate the weight of optical contact control structure, and reduce the energy resource consumption that light source and image sensor cause.
Please refer to Fig. 2 B, it illustrates the vertical view of optical contact control structure 200 in touch-control state.In optical contact control structure 200, this catoptron 206 produces the mirror image of sensing range 201, that is reflection sensing range 201a.These image sensor 203 sensing touch-control scopes 201 and reflection sensing range 201a.In the time that touch-control carries out, in touch-control scope 201, there will be touch point 204, in reflection sensing range 201a, there will be reflection touch point 204a, image sensor 203 can become two dim spots by sensing for touch point 204 and reflection touch point 204a.By these two angle θ corresponding to dim spots difference
1, θ
2and the long L of touch-control scope 201 and wide H, and then can calculate the position (x, y) of touch point 204 in touch-control scope 201.
But process catoptron 206 marches to the light travel path L2 of image sensor 203 again, often comes longly than the light travel path L1 that directly marches to image sensor 203.Generally speaking, square being inversely proportional to of the intensity of light and light travel path length.
If, the light of the light-guide device guiding in optical contact control structure is only common uniform light, the received light of image sensor 203 just can be inhomogeneous, that is will be low than what be directly sent to image sensor 203 through the light intensity of catoptron 206.Thus, image sensor 203 just can variation for the identification capability of reflection touch point 204a, and may cause θ
2accuracy decline, and then affect the result of calculation of touch point 204 positions.
Therefore, in the present embodiment, due in the time that the travel path of first direction light D1 is less than the travel path of second direction light D2, make to be greater than through the light intensity of the second direction light D2 of catoptron 206 light intensity of first direction light D1, therefore, the received light of image sensor 203 can be comparatively even.So, the present embodiment can maintain the identification capability for reflection touch point 204a, maintains θ
2accuracy in judgement, and then make the result of calculation of touch point 204 positions more accurate.
The second embodiment
Please refer to Fig. 3 A, it is the vertical view illustrating according to the optical contact control structure 300 of second embodiment of the invention.Be compared to the first embodiment, light-guide device can make further each go out the light of luminous point most of be first direction light D1 or second direction light D2, and the light quantity of first direction light D1 and second direction light D2 can design in advance.So, can make the light intensity of the light of different directions can obtain controlling more accurately.
Please refer to Fig. 3 B, it is the schematic diagram illustrating according to an example of the light-guide device 302 of second embodiment of the invention.Light-guide device 302 comprises guide layer 302c, collimation layer 302d and beam splitter layer 302e.The light that guide layer 302c produces in order to guide light source 305, makes light be directed to equably collimation layer 302d.Collimation layer 302d is disposed between guide layer 302c and beam splitter layer 302e, and collimation layer 302d is directed to beam splitter layer 302e in order to the light that guide layer 302c is guided abreast with the direction that is approximately perpendicular to guide layer 302c.The upper surface of beam splitter layer 302e is exiting surface 302a, beam splitter layer 302e with so that the light that collimation layer 302d guides abreast as shown in Figure 3A, each go out first direction light D1 and the second direction light D2 ejaculation with two different directions haply on luminous point 302b.
Please refer to Fig. 3 C, Fig. 3 D, Fig. 3 E and Fig. 3 F, Fig. 3 C is the side view illustrating according to the beam splitter layer 302e of second embodiment of the invention.Fig. 3 D, Fig. 3 E, Fig. 3 F are the light splitting schematic diagram illustrating according to the spectrophotometric unit 311 of second embodiment of the invention.
As shown in Figure 3 C, to have multiple spectrophotometric units 311 be for example spectrophotometric unit 311 (1), 311 (2) and 311 (3) to beam splitter layer 302e.As shown in Fig. 3 D, Fig. 3 E, Fig. 3 F, spectrophotometric unit 311 (1), 311 (2) and 311 (3) has respectively the first plane 311a (1), 311a (2) and 311a (3) and the second plane 311b (1), 311b (2) and 311b (3).The light of light-guide device 302 is via going out after the processing of the first plane 311a of the corresponding spectrophotometric unit 311 of luminous point 302b, produce first direction light D1, light in light-guide device, via going out after the processing of the second plane 311b of the corresponding spectrophotometric unit 311 of luminous point 302b, produces second direction light D2.
As shown in Figure 3 D, in the time going out luminous point 302b away from primary importance 307, for example luminous point 302b (1), the light penetration of light-guide device 302 goes out the first plane 311a (1) of the corresponding spectrophotometric unit 311 (1) of luminous point 302b (1), to produce first direction light D1 (1).Light in light-guide device 302, after going out the second plane 311b (1) total reflection of the corresponding spectrophotometric unit 311 (1) of luminous point 302b (1), produces second direction light D2 (1).Wherein, the first plane 311a (1) is in fact level, and the scope at the pitch angle of the second plane 311b (1) is for example 45 degree to 90 degree.Thus, first direction light D1 (1) is able to directly advance toward image sensor 303.In addition,, by adjusting the pitch angle of the second plane 311b (1), make second direction light D2 (1) be able to advance toward image sensor 303 through catoptron 306.
In the present embodiment, in the time going out luminous point 302b and approach from the position away from primary importance 307 toward primary importance 307, for example luminous point 302b (2), as shown in Fig. 3 E, the light refraction of light-guide device 302 penetrates out the first plane 311a (2) of the corresponding spectrophotometric unit 311 (2) of luminous point 302b (2), to produce first direction light D1 (2).Light in light-guide device 302 also, after going out the second plane 311b (2) total reflection of the corresponding spectrophotometric unit 311 (2) of luminous point 302b (2), produces second direction light D2 (2).Wherein, the first plane 311a (2) pitch angle is less than the pitch angle of the second plane 311b (2), and the scope at the pitch angle of the second plane 311b (2) is for example also 45 degree to 90 degree.By adjusting the pitch angle of the first plane 311a (2) and the second plane 311b (2), make first direction light D1 (2) be able to directly advance toward image sensor 303, and second direction light D2 (2) is able to advance toward image sensor 303 through catoptron 306.
In the present embodiment, as shown in Fig. 3 F, when going out luminous point 302b gradually when contiguous primary importance 307, for example luminous point 302b (3), the light of light-guide device 302 produces total reflection in the first plane 311a (3) that goes out the corresponding spectrophotometric unit 311 (3) of luminous point 302b, to produce first direction light D1 (3).Light in light-guide device 302 also produces total reflection in the second plane 311b (3) that goes out the corresponding spectrophotometric unit 311 (3) of luminous point 302b (3), to produce second direction light D2 (3).What is more, equal in fact the pitch angle of the second plane 311b at the pitch angle of the first plane 311a that goes out the corresponding spectrophotometric unit 311 of luminous point 302 of primary importance 307.
In the present embodiment, the first plane 311a of most spectrophotometric unit 311 is less than the projection of the second plane 311b at exiting surface 302a in the projection of exiting surface 302a.Thus, the light intensity of the first direction light D1 (having shorter light travel path) producing after processing via the first plane 311a of spectrophotometric unit 311, just can be less than the light intensity of the second direction light D2 (having longer light travel path) producing after the processing via the second plane 311b of spectrophotometric unit 311.
In the present embodiment, as shown in Figure 3A, restriction the first rising angle θ between first direction light D1 and exiting surface 302a
d, restriction the second rising angle θ between second direction light D2 and exiting surface 302a
m, the first rising angle θ
dand the second rising angle θ
mrespectively according to following formula configuration:
The first rising angle θ
d(x)=tan
-1(H/x), x=0～L;
The second rising angle θ
m(x)=tan
-1[H/ (2L-x)], x=0～L;
Wherein, the length that H is catoptron, the length that L is light-guide device, x is the position on light-guide device, x=0 be light-guide device away from these primary importance 307 parts, x=L is primary importance 307 parts.
Taking length breadth ratio as the contact panel of 16: 9 is as example, (being positioned at the high order end of the light-guide device 302 shown in Fig. 3 A) away from going out in luminous point 302b of primary importance 307, the first rising angle θ between the exiting surface 302a of first direction light D1 and light-guide device 302
dbe about 90 degree, the second rising angle θ between the exiting surface 302a of second direction light D2 and light-guide device 302
mbe about 15.7 degree.(be positioned at the middle body of the light-guide device 302 shown in Fig. 3 A) in going out in luminous point 302b of light-guide device 302 central authorities, the first rising angle θ between the light light face 302a of first direction light D1 and light-guide device 302
dbe about 48.4 degree, the second rising angle θ between the light light face 302a of second direction light D2 and light-guide device 302
mbe about 20.6 degree.(be positioned at the low order end of the light-guide device 302 shown in Fig. 3 A), the first rising angle θ between the exiting surface 302a of first direction light D1 and light-guide device 302 in contiguous going out in luminous point 302b of primary importance 307
dbe about 29.4 degree, the second rising angle θ between the exiting surface 302a of second direction light D2 and light-guide device 302
malso be about 29.4 degree.
According to the corresponding different optical path length of the light of different angles, can design accordingly the first different plane 311a at the projection amount of exiting surface 302a and the second plane 311b the projection amount at exiting surface 302a.So, can reach the light that light travel path is grown, can there is larger light intensity, so that the light from the direct directive image sensor of light-guide device that image sensor 303 receives, approximate with the intensity of the light through catoptron directive image sensor, accuracy when increasing position (x, y) in touch-control scope 201 of the judgement touch point 204 of image sensor 303.
In the embodiment of above-mentioned optical contact control structure, the first plane 311a and the second plane 311b by spectrophotometric unit 311 distribute in the projection of exiting surface 302a, must make the light intensity of the first direction light D1 producing after the processing via the first plane 311a of most of spectrophotometric unit 311, be less than the light intensity of the second direction light D2 producing after the processing via the second plane 311b of spectrophotometric unit 311, thereby make that image sensor 303 receives the light intensity of sensing range more even, thereby promote the sensing accuracy of image sensor.
In addition, about optical contact control structure of the present invention, wherein this light-guide device is made taking the material of refractive index as 1.4 to 1.6.For example this light-guide device is made with the material of polymethylmethacrylate (Polymethylmethacrylate, PMMA).
In sum, although disclose the present invention in conjunction with an above preferred embodiment, but it is not in order to limit the present invention.Be familiar with in the technical field of the invention this operator, without departing from the spirit and scope of the present invention, can be used for a variety of modifications and variations.Therefore, protection scope of the present invention should with enclose claim was defined is as the criterion.
Claims (14)
1. an optical contact control structure, comprising:
Light-guide device, has an exiting surface;
Light source, contiguous this light-guide device arranges, and this light-guide device guides the light that this light source produces to penetrate from this exiting surface;
Catoptron, is disposed at a side of this light-guide device, and the bearing of trend of this catoptron is vertical with this exiting surface in fact, and this light-guide device and this catoptron intersection are defined as a primary importance, and this light-guide device and this catoptron limit a touch-control scope; And
Image sensor, is arranged at the second place with respect to this primary importance, and the sensing range of this image sensor is at least contained this touch-control scope;
Wherein, this light-guide device comprises guide layer and beam splitter layer, the light that this guide layer produces in order to guide this light source, this beam splitter layer is used so that the light that this guide layer is guided penetrates with two different directions haply, the light of these two different directions is respectively the first direction light advancing toward this image sensor and the second direction light advancing toward this image sensor through this catoptron, in the time that the travel path of this first direction light is less than the travel path of this second direction light, the light intensity of this second direction light is greater than the light intensity of this first direction light.
2. optical contact control structure as claimed in claim 1, wherein, the light that this light source penetrates irradiates towards the direction of this catoptron.
3. optical contact control structure as claimed in claim 2, wherein, this light-guide device also comprises collimation layer, is disposed between this guide layer and this beam splitter layer, and this collimation layer is directed to this beam splitter layer in order to the light that this guide layer is guided abreast with the direction that is approximately perpendicular to this guide layer.
4. optical contact control structure as claimed in claim 2, wherein, this beam splitter layer has multiple spectrophotometric units, respectively this spectrophotometric unit has the first plane and the second plane, the light of this light-guide device goes out after the processing of this first plane of corresponding this spectrophotometric unit of luminous point via this, produce this first direction light, the light in this light-guide device goes out after the processing of this second plane of corresponding this spectrophotometric unit of luminous point via this, produces this second direction light.
5. optical contact control structure as claimed in claim 4, wherein, in the time that this goes out luminous point away from this primary importance, this goes out this first plane of corresponding this spectrophotometric unit of luminous point the light penetration of this light-guide device, to produce this first direction light, light in this light-guide device goes out after this second plane total reflection of corresponding this spectrophotometric unit of luminous point in this, produces this second direction light.
6. optical contact control structure as claimed in claim 4, wherein, in the time that this goes out luminous point away from this primary importance, this this first plane that goes out corresponding this spectrophotometric unit of luminous point is in fact level, and this scope that goes out the pitch angle of this second plane of corresponding this spectrophotometric unit of luminous point is 45 degree to 90 degree.
7. optical contact control structure as claimed in claim 4, wherein, the pitch angle of this of arbitrary spectrophotometric unit the first plane is less than or equal to the pitch angle of this second plane.
8. optical contact control structure as claimed in claim 4, wherein, in the time that this goes out contiguous this primary importance of luminous point, the light of this light-guide device produces total reflection in this first plane that this goes out corresponding this spectrophotometric unit of luminous point, to produce this first direction light, light in this light-guide device produces total reflection in this second plane that this goes out corresponding this spectrophotometric unit of luminous point, to produce this second direction light.
9. optical contact control structure as claimed in claim 8, wherein, this pitch angle that goes out this first plane of corresponding this spectrophotometric unit of luminous point equals in fact the pitch angle of this second plane.
10. optical contact control structure as claimed in claim 1, wherein, this light-guide device is made taking the material of refractive index as 1.4 to 1.6.
11. optical contact control structures as claimed in claim 1, wherein, this light-guide device is made with the material of polymethylmethacrylate (Polymethylmethacrylate, PMMA).
12. optical contact control structures as claimed in claim 1, also comprise another light-guide device and another light source, this another light-guide device is arranged at the position with respect to this catoptron in this touch-control scope, and be adjacent to this second place and this light-guide device, contiguous this another light-guide device of this another light source arranges.
13. optical contact control structures as claimed in claim 1, wherein, restriction one first rising angle between this first direction light and exiting surface, this first rising angle is complied with following formula:
The first rising angle θ
d(x)=tan
-1(H/x), x=0～L;
Wherein, H is the length of this catoptron, and L is the length of this light-guide device, and x is the position on this light-guide device, x=0 be this light-guide device away from this primary importance part, x=L is this primary importance part.
14. optical contact control structures as claimed in claim 1, wherein, restriction one second rising angle between this second direction light and exiting surface, this second rising angle is complied with following formula:
The second rising angle θ
m(x)=tan
-1[H/ (2L-x)], x=0～L;
Wherein, H is the length of this catoptron, and L is the length of this light-guide device, and x is the position on this light-guide device, x=0 be this light-guide device away from this primary importance part, x=L is this primary importance part.
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| CN201010260698.2A CN102375616B (en) | 2010-08-19 | 2010-08-19 | Optical contact control structure |
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|---|---|---|---|
| CN201010260698.2A CN102375616B (en) | 2010-08-19 | 2010-08-19 | Optical contact control structure |
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| CN102375616B true CN102375616B (en) | 2014-07-02 |
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| CN104571722B (en) * | 2013-10-15 | 2017-09-15 | 宸鸿科技(厦门)有限公司 | Contact panel |
| US10437391B2 (en) | 2016-11-17 | 2019-10-08 | Shenzhen GOODIX Technology Co., Ltd. | Optical touch sensing for displays and other applications |
| WO2018214691A1 (en) * | 2017-05-23 | 2018-11-29 | Shenzhen GOODIX Technology Co., Ltd. | Optical touch sensing for displays and other applications |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101593063A (en) * | 2009-04-29 | 2009-12-02 | 香港应用科技研究院有限公司 | The sensor-based system of touch sensitive device |
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| US8135561B2 (en) * | 2008-10-10 | 2012-03-13 | Pixart Imaging Inc. | Sensing system |
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| CN101593063A (en) * | 2009-04-29 | 2009-12-02 | 香港应用科技研究院有限公司 | The sensor-based system of touch sensitive device |
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