CN105654075A - Fingerprint identification device and method - Google Patents
Fingerprint identification device and method Download PDFInfo
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- CN105654075A CN105654075A CN201610206781.9A CN201610206781A CN105654075A CN 105654075 A CN105654075 A CN 105654075A CN 201610206781 A CN201610206781 A CN 201610206781A CN 105654075 A CN105654075 A CN 105654075A
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- induction electrode
- fingerprint identification
- identification device
- electrode
- fingerprint
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
Abstract
The invention provides a fingerprint identification device and method. The device comprises an insulation substrate, wherein grid lines, data lines and TFT (thin-film transistor) switches are arranged on one side of the insulation substrate, and induction electrodes are arranged on the other side of the insulation substrate; the grid lines and the data lines are arranged in a cross manner, so that a plurality of induction units are formed by division, and the position of each TFT switch corresponds to that of the corresponding induction unit; grids of the TFT switches are connected with the grid lines, one of a source and a drain of each TFT switch is connected with the data line, and the other is connected with the induction electrode. The method performs fingerprint identification by adopting the fingerprint identification device provided by any one embodiment of the invention.
Description
Technical field
The present invention relates to electronic technology field, particularly relate to a kind of fingerprint identification device and method.
Background technology
Fingerprint refers to the streakline that the recessed injustice of the finger tips of people positive surface skin epirelief produces. The regular arrangement of streakline forms different line types. Owing to everyone fingerprint is different, it is exactly that between the ten of same people refers to, fingerprint also has obvious difference, and fingerprint has unchangeable property, uniqueness, accessibility, and therefore, fingerprint recognition can be applied to multiple different occasion. The occasion registered etc. to need identification to verify such as work attendance of going to work. Thus the improvement of fingerprint identification technology is also current technical development trend.
Summary of the invention
In view of this, the present invention provides a kind of fingerprint identification device and method, has better fingerprint recognition effect.
Based on above-mentioned purpose fingerprint identification device provided by the invention, comprising insulating substrate substrate, described insulating substrate substrate side is provided with grid line, data line, TFT switch, and another side is provided with induction electrode; Described grid line and data line intersection arrange and divide out multiple sensing unit, and the position of each TFT switch is corresponding with described sensing unit; The grid of described TFT switch is connected with described grid line, in source electrode and drain electrode one is connected with described data line, another is connected with described induction electrode.
Optionally, described insulating substrate substrate being provided with through hole, described TFT switch is connected with described induction electrode by described through hole.
Optionally, being provided with conductor pin in described through hole, described TFT switch is connected with described induction electrode by the conductor pin in described through hole.
Optionally, described through-hole diameter is 7-15 micron.
Optionally, described induction electrode is rectangle, and length is 40-60 micron, width is 40-60 micron.
Optionally, spacing between adjacent described induction electrode is 1 micron-2 microns.
Optionally, the thickness of described insulating substrate substrate is greater than 300 microns.
Optionally, also comprising encapsulation cover plate, described encapsulation cover plate covers described induction electrode, grid line, data line and TFT switch.
Optionally, the winding all around of described encapsulation cover plate is equipped with signal sender electrode, for forming mutual capacity with described induction electrode.
Optionally, described fingerprint identification device also comprises:
Electrostatic detection module: by whether each induction electrode receives the fingerprint convex-concave situation that electrostatic signal judges the position that this induction electrode is corresponding, and then obtain finger print.
Optionally, described fingerprint identification device also comprises:
TFT control module: for the connection by induction electrode and power supply described in described TFT switch conducting;
Self-capacitance time detecting module: for the self-capacitance duration of charging detected between finger and each induction electrode;
First fingerprint calculates module: for obtaining finger print by the described duration of charging.
Optionally, described fingerprint identification device also comprises:
Electrode control module: for described signal sender electrode input detection signal;
Capacitance size detection module: for detecting the mutual capacity size variation of induction electrode and signal sender electrode;
2nd fingerprint calculates module: for obtaining finger print by described mutual capacity size variation.
Meanwhile, the present invention provides a kind of fingerprint identification method, utilizes the fingerprint identification device detection fingerprint that any one embodiment of the present invention provides, comprising:
By whether each induction electrode receives the fingerprint convex-concave situation that electrostatic signal judges the position that this induction electrode is corresponding, and then obtain finger print.
Simultaneously, the present invention also provides a kind of fingerprint identification method, utilizing the fingerprint identification device detection fingerprint that any one embodiment of the present invention provides, and described finger print detection device also comprises encapsulation cover plate, described encapsulation cover plate covers described induction electrode, grid line, data line and TFT switch; Described method comprises:
By the connection of induction electrode and power supply described in described TFT switch conducting;
The self-capacitance duration of charging between detection finger and each induction electrode;
Finger print is obtained by the described duration of charging.
Further, the present invention also provides a kind of fingerprint identification method, it is characterized in that, the fingerprint identification device utilizing any one embodiment of the present invention to provide carries out fingerprint recognition, and described fingerprint identification device also comprises encapsulation cover plate, described encapsulation cover plate covers described induction electrode, grid line, data line and TFT switch; The winding all around of described encapsulation cover plate is equipped with signal sender electrode, for forming mutual capacity with described induction electrode. Described comprise:
Within the scope of encapsulation cover plate, detection electric field is produced by described signal sender electrode and Signal reception electrode;
The capacitance size change of detection corresponding to the concavo-convex position of finger print;
Finger print is obtained by described electric capacity.
As can be seen from above, fingerprint identification device provided by the invention and method, effective element of fingerprint will be identified: induction electrode and TFT switch, grid line, data line are separately positioned on insulating substrate substrate both sides, this kind of structure allows the gap between the enlarged areas of induction electrode and induction electrode to reduce, thus improves precision and the recognition effect of fingerprint recognition.
Accompanying drawing explanation
Figure 1A is the fingerprint identification device structural representation of the embodiment of the present invention;
Figure 1B is the structural representation of fingerprint identification device at other direction of the embodiment of the present invention;
Fig. 1 C is the induction electrode schematic layout pattern of the fingerprint identification device of the embodiment of the present invention;
Fig. 2 is the fingerprint identification device structural representation of the present invention's another kind of embodiment;
Fig. 3 is the fingerprint identification device structural representation of another embodiment of the present invention;
Fig. 4 is the fingerprint identification method schematic flow sheet of the embodiment of the present invention;
Fig. 5 is the fingerprint identification method schematic flow sheet of another embodiment of the present invention.
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearly, it is described in detail below in conjunction with the accompanying drawings and the specific embodiments.
First the present invention provides a kind of fingerprint identification device, with reference to Figure 1A, Figure 1B, Fig. 1 C, comprises insulating substrate substrate 101, and described insulating substrate substrate 101 side is provided with grid line 102, data line 103, TFT switch 104, and another side is provided with induction electrode 105; Described grid line 102 and data line 103 intersection arrange and divide out multiple sensing unit 106, and the position of each TFT switch 104 is corresponding with described sensing unit 106; The grid of described TFT switch 104 is connected with described grid line 102, in source electrode and drain electrode one is connected with described data line 103, another is connected with described induction electrode 105.
Content can be found out from above, fingerprint identification device provided by the invention, induction electrode is arranged on insulating substrate substrate side, grid line, data line, TFT switch are arranged on another side of underlay substrate, so that the size of induction electrode can increase, spacing between induction electrode can reduce, and accuracy of identification can improve, and has better fingerprint recognition effect.
In embodiments of the present invention, insulating substrate substrate side arranges described induction electrode, another side arranges and detects circuit as shown in Figure 1B, grid line 102 and data line 103 by intersecting divide out sensing unit 106, grid line 102 is mutually substantially vertical with data line 103, in each sensing unit 106, arranging a TFT switch 104, each sensing unit 106 is corresponding to a described induction electrode. When detecting fingerprint signal, induction electrode is lined by line scan by grid line, and when every a line grid line is opened, the data line of all row receives the electrical signal on the induction electrode of this row, realizes the identification of fingerprint by analyzing described electrical signal further.
The structure iron that described insulating substrate substrate arranges induction electrode side as shown in Figure 1 C, multiple induction electrodes 105 and multiple sensing unit one_to_one corresponding.
In a particular embodiment, described insulating substrate substrate is glass substrate.
In some embodiments of the invention, with reference to Figure 1A, described insulating substrate substrate 101 being provided with through hole 107, described TFT switch 104 is connected with described induction electrode 105 by described through hole 107. Induction electrode passes through the another side of the through hole conducting on insulating substrate substrate to glass, and this design is possible not only to effectively improve induction electrode area, and can solve the problem that induction electrode load is big.
In the specific embodiment of the invention, the quantity of described through hole is equal with the quantity of described induction electrode, and an induction electrode is connected with a TFT switch by a through hole. In other embodiments, the quantity of through hole can also less than the quantity of induction electrode, multiple induction electrode is connected one to one by a through hole and multiple TFT switch, is connected by wire between induction electrode and TFT switch, is provided with insulation layer between different wires.
In the specific embodiment of the invention, when making described induction electrode, induction electrode can be fabricated in described through hole so that described induction electrode directly contacts with described TFT switch and produces electrical connection.
In other embodiments of the present invention, described insulating substrate substrate not arranging described through hole, described induction electrode is connected to described TFT switch by the wire being arranged on insulating substrate substrate.
In some embodiments of the invention, being still provided with conductor pin 108 with reference in through hole described in Fig. 1 C, described TFT switch is connected with described induction electrode 105 by the conductor pin 108 in described through hole.
In the better embodiment of the present invention, the making material of described conductor pin is copper or gold or silver-colored.In making processes, first on insulating substrate substrate, through hole is made, through-hole diameter size is generally 10 microns, filled copper by electroplating technology in through hole position, namely each through hole runs through a copper post (CuPillar) such that it is able to conducting is positioned at metal electrode and the TFT switch on insulating substrate substrate two sides. One layer is arranged for detecting the induction electrode of fingerprint in the side of insulating substrate substrate, each induction electrode is preferably a square, size preferably 50 microns �� 50 microns, and between adjacent induction electrode, gap can be very little, such as 2 microns, thus increase the area of induction as far as possible. In another side of described insulating substrate substrate, detection circuit is set, namely grid line, data line, TFT switch, its principle first makes source and drain metal level at the back side of glass, form data line, then it is layer by layer active, it is finally grid metal level, as grid line, silicon nitride dielectric layer is set in the position of necessity simultaneously, forms TFT switch. The position that arranges of TFT switch can just to described induction electrode.
In some embodiments of the invention, described through-hole diameter is 7-15 micron.
In some embodiments of the invention, described induction electrode is rectangle, and length is 40-60 micron, width is 40-60 micron.
In some embodiments of the invention, the spacing between adjacent described induction electrode is 1 micron-2 microns.
In some embodiments of the invention, the thickness of described insulating substrate substrate is greater than 300 microns. Because insulating substrate substrate is more than 300um, thickness is enough big, so the stray capacitance between the detection circuit of insulating substrate substrate side induction electrode and another side of insulating substrate substrate is very little, the RCLoading (signal delay) of corresponding detection circuit has very little, and signal detection can be convenient.
In some embodiments of the invention, described fingerprint identification device also comprises encapsulation cover plate, and described encapsulation cover plate covers described induction electrode, grid line, data line and TFT switch.
In a kind of specific embodiment of the present invention, as shown in Figure 2, described fingerprint identification device comprises glass substrate 201, glass substrate 201 side is provided with grid line 202, data line, TFT switch 204, and another side is provided with induction electrode 205; Described grid line 202 and data line intersection arrange and divide out multiple sensing unit, the position of each TFT switch 204 is corresponding with described sensing unit, being provided with multiple through hole 207 on glass substrate 201, described TFT switch 204 connects induction electrode 205 by the copper post being arranged in described through hole 207; The grid of described TFT switch 204 is connected with described grid line 202, in source electrode and drain electrode one is connected with described data line, another is connected with described induction electrode 205. Induction electrode 205 is square, and the length of side is 50 microns. Gap between adjacent induction electrode 205 is 2 microns. The diameter of through hole 207 is 10 microns. Arranging encapsulation cover plate 206 above induction electrode 205, encapsulation cover plate 206 covers induction electrode 205, grid line 202, data line and TFT switch 204. When pointing the 208 described encapsulation cover plate 206 of contact, finger 208 can form self-capacitance with induction electrode 205, by detecting the change of self-capacitance, can calculate the fingerprint identifying finger.
When described fingerprint identification device does not comprise encapsulation cover plate, finger directly contacts induction electrode, due to the direct band electrostatic of human body, the position of fingerprint ridge can directly and induction electrode, thus the induction electrode of corresponding points has electrical signal detected circuit detection, corresponding fingerprint valley position is not with the contact of corresponding induction electrode, then no signal, by such corresponding fingerprint pattern of principle detection.
In some embodiments of the invention, the winding all around of described encapsulation cover plate is equipped with signal sender electrode, for forming mutual capacity with described induction electrode.
In a kind of specific embodiment of the present invention, as shown in Figure 3, described fingerprint identification device comprises glass substrate 301, glass substrate 301 side is provided with grid line 302, data line, TFT switch 304, and another side is provided with induction electrode 305; Described grid line 302 and data line intersection arrange and divide out multiple sensing unit, the position of each TFT switch 304 is corresponding with described sensing unit, being provided with multiple through hole 307 on glass substrate 301, described TFT switch 304 connects induction electrode 305 by the copper post being arranged in described through hole 307; The grid of described TFT switch 304 is connected with described grid line 302, in source electrode and drain electrode one is connected with described data line, another is connected with described induction electrode 305. Induction electrode 305 is square, and the length of side is 50 microns. Gap between adjacent induction electrode 305 is 2 microns. The diameter of through hole 307 is 10 microns. Arranging encapsulation cover plate 306 above induction electrode 305, encapsulation cover plate 306 covers induction electrode 305, grid line 302, data line and TFT switch 304. Encapsulation cover plate 306 surrounding is provided with signal sender electrode 303, and induction electrode 305 forms mutual capacity as Signal reception electrode and signal sender electrode 303. Cause mutual capacity to change when pointing the 308 described encapsulation cover plate 306 of touching, identify finger print by the change calculations of mutual capacity.
In some embodiments of the invention, described fingerprint identification device also comprises:
Electrostatic detection module: by whether each induction electrode receives the fingerprint convex-concave situation that electrostatic signal judges the position that this induction electrode is corresponding, and then obtain finger print.
In some embodiments of the invention, described fingerprint identification device also comprises:
TFT control module: for the connection by induction electrode and power supply described in described TFT switch conducting;
Self-capacitance time detecting module: for the self-capacitance duration of charging detected between finger and each induction electrode;
First fingerprint calculates module: for obtaining finger print by the described duration of charging.
In the above-described embodiments, electric capacity is formed between induction electrode electrode and finger, when pointing the described encapsulation cover plate of touching, the charging condition of the self-capacitance formed is detected between corresponding induction electrode and finger by induction electrode, electric capacity between finger paddy and induction electrode and the capacitance size between finger ridge and induction electrode are variant, so the charging speed of electric capacity also can be variant, identify the position of paddy ridge by detecting this difference, thus realize fingerprint identification function.
In some embodiments of the invention, described fingerprint identification device also comprises:
Electrode control module: for described signal sender electrode input detection signal;
Capacitance size detection module: for detecting the mutual capacity size variation of induction electrode and signal sender electrode;
2nd fingerprint calculates module: for obtaining finger print by described mutual capacity size variation.
In the above-described embodiments, signal sender electrode sends electrical signal, and induction electrode serves as Signal reception electrode. When pointing touching encapsulation cover plate, finger paddy ridge causes the change difference of the mutual capacity between signal sender electrode and induction electrode, identifies fingerprint signal by identifying the change of mutual capacity.
Meanwhile, the present invention also provides a kind of fingerprint identification method, utilizes the fingerprint identification device detection fingerprint that any one embodiment of the present invention provides, comprising:
By whether each induction electrode receives the fingerprint convex-concave situation that electrostatic signal judges the position that this induction electrode is corresponding, and then obtain finger print.
Further, the present invention also provides a kind of fingerprint identification method, utilize the fingerprint identification device detection fingerprint that the embodiment of the present invention provides, described fingerprint identification device comprises insulating substrate substrate, described insulating substrate substrate side is provided with grid line, data line, TFT switch, and another side is provided with induction electrode; Described grid line and data line intersection arrange and divide out multiple sensing unit, and the position of each TFT switch is corresponding with described sensing unit; The grid of described TFT switch is connected with described grid line, in source electrode and drain electrode one is connected with described data line, another is connected with described induction electrode; Described fingerprint identification device also comprises encapsulation cover plate, and described encapsulation cover plate covers described induction electrode, grid line, data line and TFT switch. Described fingerprint identification method comprises flow process as shown in Figure 4:
Step 401: by the connection of induction electrode and power supply described in described TFT switch conducting;
Step 402: the self-capacitance duration of charging between detection finger and each induction electrode;
Step 403: obtain finger print by the described duration of charging.
Further, the present invention also provides a kind of fingerprint identification method, and the fingerprint identification device adopting the embodiment of the present invention to provide carries out fingerprint recognition. Described fingerprint identification device comprises insulating substrate substrate, and described insulating substrate substrate side is provided with grid line, data line, TFT switch, and another side is provided with induction electrode; Described grid line and data line intersection arrange and divide out multiple sensing unit, and the position of each TFT switch is corresponding with described sensing unit; The grid of described TFT switch is connected with described grid line, in source electrode and drain electrode one is connected with described data line, another is connected with described induction electrode; Described fingerprint identification device also comprises encapsulation cover plate, and described encapsulation cover plate covers described induction electrode, grid line, data line and TFT switch; The winding all around of described encapsulation cover plate is equipped with signal sender electrode, for forming mutual capacity with described induction electrode. Described fingerprint identification method comprises flow process as shown in Figure 5:
Step 501: produce detection electric field within the scope of encapsulation cover plate by described signal sender electrode and Signal reception electrode;
Step 502: the capacitance size change of detection corresponding to the concavo-convex position of finger print;
Step 503: obtain finger print by described electric capacity.
As can be seen from above, fingerprint identification device provided by the invention and method, effective element of fingerprint will be identified: induction electrode and TFT switch, grid line, data line are separately positioned on insulating substrate substrate both sides, this kind of structure allows the gap between the enlarged areas of induction electrode and induction electrode to reduce, thus improves precision and the recognition effect of fingerprint recognition.
It is to be understood that the multiple embodiments described by this specification sheets are only for instruction and explanation of the present invention, it is not intended to limit the present invention. And when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
Obviously, the present invention can be carried out various change and modification and not depart from the spirit and scope of the present invention by the technician of this area. Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these change and modification.
Claims (14)
1. a fingerprint identification device, it is characterised in that, comprise insulating substrate substrate, described insulating substrate substrate side is provided with grid line, data line, TFT switch, and another side is provided with induction electrode;Described grid line and data line intersection arrange and divide out multiple sensing unit, and the position of each TFT switch is corresponding with described sensing unit; The grid of described TFT switch is connected with described grid line, in source electrode and drain electrode one is connected with described data line, another is connected with described induction electrode.
2. fingerprint identification device according to claim 1, it is characterised in that, described insulating substrate substrate is provided with through hole, described TFT switch is connected with described induction electrode by described through hole.
3. fingerprint identification device according to claim 2, it is characterised in that, described through hole is provided with conductor pin, described TFT switch is connected with described induction electrode by the conductor pin in described through hole.
4. fingerprint identification device according to claim 2, it is characterised in that, described through-hole diameter is 7-15 micron.
5. fingerprint identification device according to claim 1, it is characterised in that, described induction electrode is rectangle, and length is 40-60 micron, width is 40-60 micron.
6. fingerprint identification device according to claim 1, it is characterised in that, the spacing between adjacent described induction electrode is 1 micron-2 microns.
7. according to fingerprint identification device described in any one in claim 1-6, it is characterised in that, also comprise encapsulation cover plate, described encapsulation cover plate covers described induction electrode, grid line, data line and TFT switch.
8. fingerprint identification device according to claim 7, it is characterised in that, the winding all around of described encapsulation cover plate is equipped with signal sender electrode, for forming mutual capacity with described induction electrode.
9. fingerprint identification device according to claim 1, it is characterised in that, also comprise:
Electrostatic detection module: by whether each induction electrode receives the fingerprint convex-concave situation that electrostatic signal judges the position that this induction electrode is corresponding, and then obtain finger print.
10. fingerprint identification device according to claim 7, it is characterised in that, also comprise:
TFT control module: for the connection by induction electrode and power supply described in described TFT switch conducting;
Self-capacitance time detecting module: for the self-capacitance duration of charging detected between finger and each induction electrode;
First fingerprint calculates module: for obtaining finger print by the described duration of charging.
11. fingerprint identification devices according to claim 8, it is characterised in that, also comprise:
Electrode control module: for described signal sender electrode input detection signal;
Capacitance size detection module: for detecting the mutual capacity size variation of induction electrode and signal sender electrode;
2nd fingerprint calculates module: for obtaining finger print by described mutual capacity size variation.
12. 1 kinds of fingerprint identification methods, it is characterised in that, utilize the fingerprint identification device detection fingerprint described in any one in claim 1-6, comprising:
By whether each induction electrode receives the fingerprint convex-concave situation that electrostatic signal judges the position that this induction electrode is corresponding, and then obtain finger print.
13. 1 kinds of fingerprint identification methods, it is characterised in that, utilize the detection fingerprint of the fingerprint identification device described in claim 7, comprising:
By the connection of induction electrode and power supply described in described TFT switch conducting;
The self-capacitance duration of charging between detection finger and each induction electrode;
Finger print is obtained by the described duration of charging.
14. 1 kinds of fingerprint identification methods, it is characterised in that, adopt fingerprint identification device according to claim 8 to carry out fingerprint recognition, comprising:
Within the scope of encapsulation cover plate, detection electric field is produced by described signal sender electrode and Signal reception electrode;
The capacitance size change of detection corresponding to the concavo-convex position of finger print;
Finger print is obtained by described electric capacity.
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| CN201610206781.9A CN105654075A (en) | 2016-04-05 | 2016-04-05 | Fingerprint identification device and method |
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| CN201610206781.9A CN105654075A (en) | 2016-04-05 | 2016-04-05 | Fingerprint identification device and method |
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| CN106250888A (en) * | 2016-09-19 | 2016-12-21 | 汕头超声显示器（二厂）有限公司 | A kind of fingerprint recognition induction apparatus with large area identification region and application thereof |
| CN107808853A (en) * | 2017-11-14 | 2018-03-16 | 苏州科阳光电科技有限公司 | A kind of fingerprint chip-packaging structure and preparation method, terminal device |
| WO2018201800A1 (en) * | 2017-05-03 | 2018-11-08 | 京东方科技集团股份有限公司 | Optical fingerprint identification device and display panel |
| CN110287808A (en) * | 2019-06-03 | 2019-09-27 | 京东方科技集团股份有限公司 | Array substrate and its manufacturing method and display panel and display device |
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| CN1538142A (en) * | 2003-04-17 | 2004-10-20 | ������������ʽ���� | Capacitor detecting device and its driving method, fingerprint sensor and biological identification device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106250888A (en) * | 2016-09-19 | 2016-12-21 | 汕头超声显示器（二厂）有限公司 | A kind of fingerprint recognition induction apparatus with large area identification region and application thereof |
| WO2018201800A1 (en) * | 2017-05-03 | 2018-11-08 | 京东方科技集团股份有限公司 | Optical fingerprint identification device and display panel |
| US10714543B2 (en) | 2017-05-03 | 2020-07-14 | Boe Technology Group Co., Ltd. | Optical fingerprint identification device and display panel |
| CN107808853A (en) * | 2017-11-14 | 2018-03-16 | 苏州科阳光电科技有限公司 | A kind of fingerprint chip-packaging structure and preparation method, terminal device |
| CN110287808A (en) * | 2019-06-03 | 2019-09-27 | 京东方科技集团股份有限公司 | Array substrate and its manufacturing method and display panel and display device |
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