CN103699884A - Optical fingerprint collecting method, optical fingerprint collecting device and portable type electronic device - Google Patents
Optical fingerprint collecting method, optical fingerprint collecting device and portable type electronic device Download PDFInfo
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- CN103699884A CN103699884A CN201310698930.4A CN201310698930A CN103699884A CN 103699884 A CN103699884 A CN 103699884A CN 201310698930 A CN201310698930 A CN 201310698930A CN 103699884 A CN103699884 A CN 103699884A
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Abstract
The invention discloses an optical fingerprint collecting method, an optical fingerprint collecting device and a portable type electronic device. The optical fingerprint collecting method comprises the steps of emitting lights and illuminating a fingerprint; illuminating a finger image formed by the fingerprint to an image sensor unit array through a light guide array, and effectively preventing the light crosstalk between adjacent image sensor units and the light crosstalk of an image during a transmission process of the light guide array through the light guide array; respectively sensing and processing the light information of the finger image by the image sensor units, and outputting fingerprint image data which are generated after the processing. The optical fingerprint collecting device comprises the light guide array and the image sensor unit array, wherein the light guide array is arranged at the inner part of a finger contact surface of a fingerprint collecting device and is suitable for being used for transmitting and illuminating the finger image formed by the fingerprint, and the light guide array is of a latticed cylindrical structure; the image sensor unit array is correspondingly arranged at the lower part of the light guide array and is suitable for being used for receiving the finger image passing through the light guide array and generating the fingerprint image data. The thickness of the optical fingerprint collecting device disclosed by the invention is smaller.
Description
Technical field
The present invention relates to image processing field, relate in particular to a kind of optical finger print acquisition method, a kind of optical fingerprint acquisition apparatus and a kind of portable electron device.
Background technology
Optical fingerprint sensor has utilized refraction and the principle of reflection of light, to there is total reflection in the light of penetrating on finger surface crestal line (jut between streakline), reflected light is projected onto on imageing sensor, form black image, and penetrate light on finger valley line (sunk part between streakline) by finger, form white image, thereby optical fingerprint sensor will capture light and dark many gray-scale fingerprint images.
Existing optical fingerprint sensor mainly comprises three parts: LED light source, right-angle prism, cmos sensor.As shown in Figure 1, finger 13 is placed on right-angle prism 12, under LED light source 14 irradiates, light, from bottom directive right-angle prism 12, arrives the upper surface of right-angle prism 12, namely lets go and refers to 13 surface.If the position that light beam arrives at is finger crestal line, light beam will form inner full-reflection, from the another side of right-angle prism 12, spreads out of, and arrives cmos image sensor 11.If the position that light beam arrives at is finger valley line, light beam will be absorbed by the skin of finger 13.
The thickness of existing optical fingerprint sensor is at least 10-12mm.Along with the application of mobile payment, Internet of Things authentication is burning hot gradually, if in the mobile fields such as mobile phone employing fingerprint authentication, must be by the THICKNESS CONTROL of optical finger print device below 6mm.At present, only have semi-conductor electricity perhaps inductance type transducer can reach this requirement, but semi-conductor electricity perhaps the cost of inductance type transducer is high, for scale of mass production causes obstacle.
Therefore, how to reduce the thickness of optical fingerprint sensor, become those skilled in the art's technical barrier urgently to be resolved hurrily.
Summary of the invention
Technical matters to be solved by this invention is the optical fingerprint acquisition apparatus that how to provide a kind of thickness little.
In order to address the above problem, the invention provides a kind of optical finger print acquisition method, comprising:
Emit beam and irradiate finger print;
Irradiate finger pattern that described finger print forms through leaded light array to image sensor cell array, by described leaded light array, effectively prevent that the light between adjacent image sensor unit from crosstalking, and the light of image in leaded light array transmitting procedure is crosstalked;
The described image sensor cell respectively light information of finger sensing image is processed, the rear fingerprint image data generating is processed in output.
Alternatively, described leaded light array has corresponding to the leaded light region of image sensor cell and corresponding to the isolation light region in region between image sensor cell, the light information of effectively conducting finger-image by described leaded light region is to image sensor cell array.
Alternatively, described light irradiates finger print by optical thin film, and finger-image is transmitted to leaded light array.
Alternatively, the capacity effect of described optical thin film finger sensing fingerprint, the biological characteristic judgement of judgement finger print.
Alternatively, by light emission module, emit beam, it is a plurality of, and correspondence is arranged at the periphery of described leaded light array.
Alternatively, the isolation light region of described leaded light array is the light insulated column corresponding to region between described image sensor cell.
Alternatively, described image sensor cell array be N capable * array of M row arranges, wherein N is greater than or equal to 1 natural number, M is greater than or equal to 1 natural number, and N equals 1 when different with M.
The present invention also provides a kind of optical fingerprint acquisition apparatus, comprising:
Leaded light array, is placed in the inside of finger print harvester finger contact face, is suitable for transmission and irradiates the finger-image that described finger print forms, and has cancellate column structure;
Image sensor cell array, correspondence is placed in the bottom of described leaded light array, is suitable for reception by way of the finger-image of described leaded light array and generates fingerprint image data.
Alternatively, described optical fingerprint acquisition apparatus also comprises: light emission unit, and for light is provided.
Alternatively, described leaded light array has corresponding to the leaded light region of image sensor cell and corresponding to the isolation light region in region between image sensor cell, the light information of effectively conducting finger-image by described leaded light region is to image sensor cell permutation.
Alternatively, optical fingerprint acquisition apparatus also comprises: be positioned at the optical thin film of fingerprint surface of contact inside, described light irradiates finger print by optical thin film, and finger-image is transmitted to leaded light array.
Alternatively, described optical thin film, leaded light array, image sensor cell array adopt the mode of laminating to arrange.
Alternatively, described light emission unit is a plurality of, and correspondence is arranged at described leaded light array periphery.
Alternatively, the isolation light region of described leaded light array is the light insulated column corresponding to region between described imageing sensor.
Alternatively, described image sensor cell array be N capable * array of M row arranges, wherein N is greater than or equal to 1 natural number, M is greater than or equal to 1 natural number, and N equals 1 when different with M.
The present invention also provides a kind of portable electron device, comprises above-mentioned optical fingerprint acquisition apparatus.
Alternatively, described portable electron device also comprises display device and printed circuit mother board, and it is inner that described leaded light array is fixedly arranged on described display device, and described display device exposes described leaded light array surface; Described image sensor cell array is fixedly arranged on described printed circuit mother board.Compared with prior art, technical scheme of the present invention has the following advantages:
The present invention has omitted the right-angle prism in conventional fingerprint sensor, and the mode that adopts optics-semiconductor direct-coupling to publish picture is obtained fingerprint image, has saved the shared thickness of right-angle prism; Leaded light array and image sensor cell array are directly fitted, and the thickness of optical fingerprint acquisition apparatus is further dwindled.Therefore, optical fingerprint acquisition apparatus thickness of the present invention is little.
Accompanying drawing explanation
Fig. 1 is the structural representation of optical fingerprint acquisition apparatus one prior art;
Fig. 2 is the structural representation of optical fingerprint acquisition apparatus one embodiment of the present invention;
Fig. 3 is the vertical view of image sensor cell array embodiment illustrated in fig. 2;
Fig. 4 is the side view of leaded light array embodiment illustrated in fig. 2;
Fig. 5 is result schematic diagram embodiment illustrated in fig. 2;
Fig. 6 is the schematic flow sheet of optical finger print acquisition method one embodiment of the present invention.
Embodiment
A lot of details have been set forth in the following description so that fully understand the present invention.But the present invention can implement to be much different from alternate manner described here, and those skilled in the art can do similar popularization without prejudice to intension of the present invention in the situation that, so the present invention is not subject to the restriction of following public concrete enforcement.
Secondly, the present invention utilizes schematic diagram to be described in detail, and when the embodiment of the present invention is described in detail in detail, for ease of explanation, described schematic diagram is example, and it should not limit the scope of protection of the invention at this.
After deliberation, inventor finds: the optical fingerprint acquisition apparatus of prior art is thicker, and main cause is to obtain fingerprint image by the reflection of right-angle prism.Because right-angle prism itself just has certain thickness, so limited to a certain extent the thickness of optical fingerprint acquisition apparatus.And in order to obtain the complete image reflecting, must guarantee the distance long enough between right-angle prism and cmos image sensor, this has further limited again the thickness of optical fingerprint acquisition apparatus.
In order to solve the technical matters in background technology, inventor has abandoned traditional reflects by right-angle prism the method for obtaining fingerprint image, has proposed another and has directly obtained the method for fingerprint image.
The invention provides a kind of optical fingerprint acquisition apparatus.Fig. 2 is the structural representation of optical fingerprint acquisition apparatus one embodiment of the present invention.As shown in Figure 2, the present embodiment comprises: optical thin film 11, leaded light array 12, light emission unit 13, image sensor cell array 14 and base plate for packaging 15.
It is inner that described optical thin film 11 is positioned at fingerprint surface of contact.Described optical thin film 11 can be transparent or translucent material.Finger print 10 presses on described optical thin film 11 surfaces, and light irradiates finger print by described optical thin film 11, and finger-image is transmitted to described leaded light array 12.
Described optical thin film 11 also can be used for, by the capacity effect of checking finger skin, realizing the judgement to living body finger print.
Described leaded light array 12 is positioned at the below of described optical thin film 11, for the finger-image that described optical thin film 11 is obtained, is transferred to described imageing sensor permutation 14.
Described leaded light array 12 is printing opacity in the direction perpendicular to described optical thin film 11 only, light tight in the direction that is parallel to described optical thin film 11.Particularly, described leaded light array 12 is array tubular structure, comprising: leaded light region (not shown) and isolation light region (not shown).Described leaded light region is corresponding to the image sensor cell in described image sensor cell array 14.Described isolation light region is cancellate light insulated column, corresponding to the region between image sensor cell in described image sensor cell array 14.
Described leaded light array 12 can be directly to the sampling of finger Image Segmentation Using, and can effectively prevent that the imaging between adjacent image sensor unit from crosstalking, and the light of finger-image in described leaded light array 12 transmitting procedures is crosstalked.
Described light emission unit 13 is positioned at described leaded light array 12 peripheries, for described light is provided.
It should be noted that, in the present embodiment, described light provides by being placed in the light emission unit 13 of described optical fingerprint acquisition apparatus inside, but the present invention does not do concrete restriction to this.In other embodiments, described light can also be provided by other modes, such as: be placed in light source outside described optical fingerprint acquisition apparatus etc.
Described image sensor cell array 14 is positioned at the below of described leaded light array 12, for receiving by way of the finger-image of described leaded light array 12 and generating fingerprint image data.Described image sensor cell array 14 comprises a plurality of image sensor cells.Described image sensor cell is array and arranges.The finger-image that the leaded light region of described leaded light array 12 obtains Division Sampling is transferred to described image sensor cell.Corresponding to the border of described image sensor cell, can there is part or all of overlapping with the border of described image sensor cell in the isolation light region of described leaded light array 12, to prevent that the imaging between described image sensor cell from crosstalking.
The laminating type of described optical thin film 11, described leaded light array 12 and described image sensor cell array 14 is directly laminating, and centre does not need other optical lenses or prism structure, can dwindle the integral thickness of described optical fingerprint acquisition apparatus.
The present embodiment also comprises: the base plate for packaging 15 that is positioned at described image sensor cell array 14 belows, for described optical thin film 11, described leaded light array 12, described light emission unit 13, described image sensor cell array 14 are integrated, encapsulation forms independently optical fingerprint acquisition apparatus.
It will be appreciated by those skilled in the art that, can to described optical thin film 11, described leaded light array 12, described light emission unit 13, described image sensor cell array 14, encapsulate by existing encapsulation technology, make it to form independently optical fingerprint acquisition apparatus, do not repeat them here.
Fig. 3 is the vertical view of image sensor cell array embodiment illustrated in fig. 2.As shown in Figure 3, in the present embodiment, described image sensor cell array 14 consists of a plurality of image sensor cells 140.A plurality of image sensor cells 140 are the array of 15 row * 20 row and arrange.Described image sensor cell is corresponding to the leaded light region of described leaded light array 12, and the region between described image sensor cell and the border of described image sensor cell are corresponding to the isolation light region of described leaded light array 12.Described image sensor cell array 14, can direct-coupling output fingerprint image data for planar array type designs.
Fig. 4 is the side view of leaded light array embodiment illustrated in fig. 2.As shown in Figure 4, in the present embodiment, described leaded light array 12 comprises: a plurality of leaded lights region 120, make mutual lighttight isolation light region, described leaded light region 120 121.
Described leaded light region 120 is array arranges, and in the quantity of its row and row and described image sensor cell array 14, image sensor cell 140 adapts.In the present embodiment, described leaded light region 120 with described image sensor cell 140 for corresponding one by one, each leaded light region 120 be positioned at an image sensor cell 140 directly over.In other embodiments, can also the corresponding several image sensor cells 140 in leaded light region 120.The present invention does not do concrete restriction to this.
The grating texture that described isolation light region 121 is light tight material.Described isolation light region 121 directly over region between each image sensor cell 140, border that can the described image sensor cell 140 of some or all of covering.
By described isolation light region 121 isolation light, can effectively prevent that the imaging between described image sensor cell 140 from crosstalking.
Fig. 5 is result schematic diagram embodiment illustrated in fig. 2.As shown in Figure 5, the fingerprint image of final output is formed by the fingerprint image direct-coupling of a plurality of image sensor cell 140 Division Sampling outputs.
The optical fingerprint acquisition apparatus of the present embodiment has been abandoned traditional right-angle prism, and the mode that adopts optics-semiconductor direct-coupling to publish picture is obtained fingerprint image, thereby has saved the shared thickness of right-angle prism.Also adopt the direct laminating of leaded light array and image sensor cell array, and then make the integral thickness of optical fingerprint acquisition apparatus less.
The present invention can be used in numerous general or special purpose computingasystem environment or configuration.Such as: personal computer, server computer, handheld device or portable set, plate equipment, multicomputer system, system, set top box, programmable consumer-elcetronics devices, network PC, small-size computer, mainframe computer based on microprocessor, comprise the distributed computing environment of above any system or equipment etc.
It should be noted that, it will be appreciated by those skilled in the art that, above-mentioned part assembly can be programmable logic device (PLD), comprise: programmable logic array (Programmable Array Logic, PAL), generic array logic (Generic Array Logic, GAL), field programmable gate array (Field-Programmable Gate Array, FPGA), CPLD (Complex Programmable Logic Device, CPLD) one or more in, the present invention does not do concrete restriction to this.
The present invention also provides a kind of portable electron device (not shown), comprises described optical fingerprint acquisition apparatus.Described portable electron device can be smart mobile phone, portable computer, PDA etc., and the present invention does not do concrete restriction to this.
Described portable electron device also comprises display device and printed circuit mother board, and it is inner that described leaded light array is fixedly arranged on described display device, and described display device exposes described guiding device surface; Described image sensor cell array is fixedly arranged on described printed circuit mother board.
Correspondingly, the present invention also provides a kind of optical finger print acquisition method.Fig. 6 is the schematic flow sheet of optical finger print acquisition method one embodiment of the present invention.As shown in Figure 6, the present embodiment comprises the following steps:
Execution step S10, emits beam and irradiates finger print.
Particularly, described light irradiates finger print by optical thin film, and finger-image is transmitted to leaded light array.By light emission module, send described light, described light emission module has a plurality of, and correspondence is arranged at the periphery of described leaded light array.Described optical thin film can also finger sensing fingerprint capacity effect, the biological characteristic judgement of judgement finger print.
Execution step S11, irradiate finger pattern that described finger print forms through leaded light array to image sensor cell array, by described leaded light array, effectively prevent that the light between adjacent image sensor unit from crosstalking, and the light of image in leaded light array transmitting procedure is crosstalked.
Particularly, described leaded light array has corresponding to the leaded light region of image sensor cell and corresponding to the isolation light region in region between image sensor cell, the light information of effectively conducting finger-image by described leaded light region is to image sensor cell array.The isolation light region of described leaded light array is the light insulated column corresponding to region between described image sensor cell.
Particularly, described image sensor cell array be N capable * array of M row arranges, wherein N is greater than or equal to 1 natural number, M is greater than or equal to 1 natural number, and N equals 1 when different with M.
Execution step S12, the described image sensor cell respectively light information of finger sensing image is processed, the rear fingerprint image data generating is processed in output.
In another embodiment, can adopt a plurality of imageing sensors, each imageing sensor comprises respectively image sensor cell array, a plurality of imageing sensors can be distinguished the fingerprint image in collecting part region corresponding to the setting of leaded light array, also can adopt a plurality of imageing sensors of wafer scale to be directly arranged on printed circuit board (PCB) (PCB) or flexible PCB (FPC), further reduce the integral thickness of optical fingerprint acquisition apparatus.
Although the present invention with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can utilize method and the technology contents of above-mentioned announcement to make possible change and modification to technical solution of the present invention; therefore; every content that does not depart from technical solution of the present invention; any simple modification, equivalent variations and the modification above embodiment done according to technical spirit of the present invention, all belong to the protection domain of technical solution of the present invention.
Claims (17)
1. an optical finger print acquisition method, is characterized in that, comprising:
Emit beam and irradiate finger print;
Irradiate finger pattern that described finger print forms through leaded light array to image sensor cell array, by described leaded light array, effectively prevent that the light between adjacent image sensor unit from crosstalking, and the light of image in leaded light array transmitting procedure is crosstalked;
The described image sensor cell respectively light information of finger sensing image is processed, the rear fingerprint image data generating is processed in output.
2. optical finger print acquisition method according to claim 1, it is characterized in that, described leaded light array has corresponding to the leaded light region of image sensor cell and corresponding to the isolation light region in region between image sensor cell, the light information of effectively conducting finger-image by described leaded light region is to image sensor cell array.
3. optical finger print acquisition method according to claim 1, is characterized in that, described light irradiates finger print by optical thin film, and finger-image is transmitted to leaded light array.
4. optical finger print acquisition method according to claim 1, is characterized in that, the capacity effect of described optical thin film finger sensing fingerprint, the biological characteristic judgement of judgement finger print.
5. optical finger print acquisition method according to claim 1, is characterized in that, by light emission module, emits beam, and it is a plurality of, and correspondence is arranged at the periphery of described leaded light array.
6. optical finger print acquisition method according to claim 1, is characterized in that, the isolation light region of described leaded light array is the light insulated column corresponding to region between described image sensor cell.
7. optical finger print acquisition method according to claim 1, it is characterized in that, described image sensor cell array be N capable * array of M row arranges, wherein N is greater than or equal to 1 natural number, M is greater than or equal to 1 natural number, and N equals 1 when different with M.
8. an optical fingerprint acquisition apparatus, is characterized in that, comprising:
Leaded light array, is placed in the inside of finger print harvester finger contact face, is suitable for transmission and irradiates the finger-image that described finger print forms, and has cancellate column structure;
Image sensor cell array, correspondence is placed in the bottom of described leaded light array, is suitable for reception by way of the finger-image of described leaded light array and generates fingerprint image data.
9. optical fingerprint acquisition apparatus according to claim 8, is characterized in that, described optical fingerprint acquisition apparatus also comprises: light emission unit, and for light is provided.
10. optical fingerprint acquisition apparatus according to claim 8, it is characterized in that, described leaded light array has corresponding to the leaded light region of image sensor cell and corresponding to the isolation light region in region between image sensor cell, the light information of effectively conducting finger-image by described leaded light region is to image sensor cell permutation.
11. optical fingerprint acquisition apparatus according to claim 8, it is characterized in that, optical fingerprint acquisition apparatus also comprises: be positioned at the optical thin film of fingerprint surface of contact inside, described light irradiates finger print by optical thin film, and finger-image is transmitted to leaded light array.
12. optical fingerprint acquisition apparatus according to claim 11, is characterized in that, described optical thin film, leaded light array, image sensor cell array adopt the mode of laminating to arrange.
13. optical fingerprint acquisition apparatus according to claim 9, is characterized in that, described light emission unit is a plurality of, and correspondence is arranged at described leaded light array periphery.
14. optical fingerprint acquisition apparatus according to claim 10, is characterized in that, the isolation light region of described leaded light array is the light insulated column corresponding to region between described imageing sensor.
15. optical fingerprint acquisition apparatus according to claim 8, it is characterized in that, described image sensor cell array be N capable * array of M row arranges, wherein N is greater than or equal to 1 natural number, M is greater than or equal to 1 natural number, and N equals 1 when different with M.
16. 1 kinds of portable electron devices, comprise the optical fingerprint acquisition apparatus as described in any one in claim 8 to 15.
17. portable electron devices as claimed in claim 16, it is characterized in that, described portable electron device also comprises display device and printed circuit mother board, and it is inner that described leaded light array is fixedly arranged on described display device, and described display device exposes described leaded light array surface; Described image sensor cell array is fixedly arranged on described printed circuit mother board.
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Application publication date: 20140402 |