CN101727571B - Fingerprint sensing device and fingerprint sensing touch device - Google Patents
Fingerprint sensing device and fingerprint sensing touch device Download PDFInfo
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- CN101727571B CN101727571B CN200810173219A CN200810173219A CN101727571B CN 101727571 B CN101727571 B CN 101727571B CN 200810173219 A CN200810173219 A CN 200810173219A CN 200810173219 A CN200810173219 A CN 200810173219A CN 101727571 B CN101727571 B CN 101727571B
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Abstract
The invention relates to a fingerprint sensing device and a related fingerprint sensing touch device, which are provided with specially designed sensing units capable of improving the accuracy of fingerprint sensing. The fingerprint sensing device comprises a plurality of sensing units, a driving circuit and a reading circuit, wherein each sensing unit comprises a fingerprint electrode and a storage capacitor, the storage capacitor is coupled with the fingerprint electrode, and induction capacitance formed between the fingerprint electrode and a finger is connected with the storage capacitor in parallel; the driving circuit is coupled with the sensing units and can provide charging signals for charging the equivalent capacitance of each sensing unit, wherein, the equivalent capacitance value of any sensing unit is determined according to whether the sensing unit forms the induction capacitance or not; and the reading circuit is coupled with the sensing units and can read the voltage value of the storage capacitor of the sensing units after the equivalent capacitance of any sensing unit is charged, thereby judging whether the fingerprint is sensed and whether the sensed fingerprint is a ridge or a valley.
Description
Technical field
The present invention relates to fingerprint sensing (fingerprint detection), refer to the contactor control device of a kind of fingerprint acquisition apparatus and tool fingerprint sensing especially.
Background technology
Fingerprint sensing (fingerprint detection) is to use the most general biological identification technology (biometrics) at present.Because everyone fingerprint is neither together, thereby can be in order to confirm testee's true identity.Fingerprint sensing has many excellent specific properties aspect the identification identity, the therefore existing fingerprint sensing function of integrating of many products for example has the notebook computer, mobile phone of fingerprint sensing function, dish etc. with oneself.
Want effectively to carry out the fingerprint sensing function, the design of fingerprint sensing device (or claiming fingerprint inductor) is most important.The sensing region of traditional fingerprint sensing device is a strip, needs voluntarily the moveable finger brush to get scanning (sweeping scanning) when doing fingerprint sensing, the fingerprint image of the strip that is produced is recombinated again, and could obtain complete fingerprint.Yet this sensing mode is got the power limited size system of speed speed, pressure for brush, simultaneously need be in the face of problems such as contact heterogeneous and image reorganization.
Can make the fingerprint sensing device of full fingerprint sensing, normally a plurality of sensing cells formed large-area sensing array, once obtaining complete finger print, and need not carry out the reorganization of segment fingerprint.Common full fingerprint sensing device type is the capacitance type fingerprint sensor; Its sensing cell can with the different parts of fingerprint; Be line paddy (furrow) and wrinkle ridge (ridge); Form the inductance capacitances of different sizes respectively, utilize this inductance capacitance to carry out data and write and read, the data that can pass through to be read judge that what detected is line paddy or wrinkle ridge.Therefore, for the capacitance type fingerprint sensor, how to utilize this characteristic to design its sensing cell,, just become important problem with effective detecting fingerprint.
Summary of the invention
In view of this, a purpose of the present invention is to provide a kind of capacitance type fingerprint sensing apparatus; It has the sensing cell of particular design; Can simplify hardware circuit, and avoid interfering with each other and the interference of external static between adjacent sensing cell, to improve the accuracy of fingerprint sensing.
Another object of the present invention is to provide a kind of contactor control device of tool fingerprint sensing, so that the function of fingerprint sensing and touch-control to be provided simultaneously.
The present invention discloses a kind of fingerprint acquisition apparatus, comprises: a plurality of sensing cells, and each sensing cell comprises fingerprint electrode and storage capacitors, and storage capacitors is coupled to the fingerprint electrode, and formed inductance capacitance is to be parallel to storage capacitors between fingerprint electrode and finger; One drive circuit is coupled to said a plurality of sensing cell, in order to charging signals to be provided, the equivalent capacity of each sensing cell is charged, and wherein, the equivalent capacitance value of arbitrary sensing cell is to have according to said sensing cell not form inductance capacitance and decide; And one read circuit, is coupled to said a plurality of sensing cell, in order to after the equivalent capacity charging of arbitrary sensing cell, reads the magnitude of voltage of the storage capacitors of said sensing cell.
The present invention discloses a kind of contactor control device of tool fingerprint sensing in addition; It comprises aforesaid fingerprint acquisition apparatus; And wherein said a plurality of sensing cell is to be configured to a fingerprint sensing district and a Touch Zone, and the sensing cell density in said fingerprint sensing district is higher than the sensing cell density of said Touch Zone.
The present invention discloses a kind of fingerprint sensing method in addition; Comprise: a plurality of sensing cells are provided; Each sensing cell comprises fingerprint electrode and storage capacitors, and storage capacitors is coupled to the fingerprint electrode, and formed inductance capacitance is to be parallel to storage capacitors between fingerprint electrode and finger; Charging signals is provided, the equivalent capacity of each sensing cell is charged, wherein, the equivalent capacitance value of arbitrary sensing cell is to have according to said sensing cell not form inductance capacitance and decide; And after the equivalent capacity charging of arbitrary sensing cell, read the magnitude of voltage of the storage capacitors of said sensing cell.
Beneficial effect of the present invention is: can simplify hardware circuit, and avoid interfering with each other and the interference of external static between adjacent sensing cell, to improve the accuracy of fingerprint sensing.
Description of drawings
Fig. 1 is the calcspar of first preferred embodiment of capacitance type fingerprint sensing apparatus of the present invention;
Fig. 2 is the thin portion circuit diagram of the sensing cell of Fig. 1;
Fig. 3 A is the sectional view of the sensing cell of displayed map 1 when detecting line paddy;
Fig. 3 B is the sectional view of the sensing cell of displayed map 1 when detecting wrinkle ridge;
Fig. 4 is the sequential chart of coherent signal of the capacitance type fingerprint sensing apparatus of Fig. 1;
Fig. 5 is the magnitude of voltage that each sensing cell read that shows from Fig. 1;
Fig. 6 is the calcspar of second preferred embodiment of capacitance type fingerprint sensing apparatus of the present invention;
Fig. 7 is the thin portion circuit diagram of the sensing cell of Fig. 6;
Fig. 8 is the sequential chart of coherent signal of the capacitance type fingerprint sensing apparatus of Fig. 6;
Fig. 9 is another sequential chart of coherent signal of the capacitance type fingerprint sensing apparatus of Fig. 6;
Figure 10 is an instance that shows the contactor control device of tool fingerprint sensing of the present invention;
Figure 11 is the process flow diagram of a preferred embodiment of fingerprint sensing method of the present invention.
Description of reference numerals: 10,60-fingerprint acquisition apparatus; 11,61-sensing array; 12,62-driving circuit; 13,63-reads circuit; The 14-commutation circuit; 15,65-selecting circuit; 16,66-resets circuit; 17,115,1151-control line; 18,116,1161-data line; 19,117,661-resets line; 110,610-sensing cell; 111-fingerprint electrode; The 112-storage capacitors; 113-chooses switch; 114-resets switch; The 118-ground wire; The 119-inductance capacitance; The 31-substrate; 32,34,35-insulation course; The 33-active layers; The flow process of one preferred embodiment of 1100～1105-fingerprint sensing method.
Embodiment
Below in conjunction with accompanying drawing, do more detailed explanation with other technical characterictic and advantage to the present invention is above-mentioned.
Fig. 1 is the calcspar of first preferred embodiment of capacitance type fingerprint sensing apparatus of the present invention; Wherein, fingerprint acquisition apparatus 10 comprises a sensing array 11, one drive circuit 12, and reads that circuit 13, switches circuit 14, a selecting circuit 15 and is reseted circuit 16.Sensing array 11 comprises a plurality of sensing cells 110, and it is configured to several column (row) and plural number row (column) (level is row, vertically is row, be eight row, six row among the figure, yet columns and line number is not as limit).Selecting circuit 15 is coupled to sensing array 11 by a plurality of control lines 17, and each control line 17 couples a wherein row sensing cell.Commutation circuit 14 is coupled to sensing array 11 by a plurality of data lines 18, and each data line 18 couples wherein delegation's sensing cell.Driving circuit 12 and read circuit 13 and be coupled to commutation circuit 14 respectively; Commutation circuit 14 can determine a plurality of data lines 18 are switched to driving circuit 12 or read circuit 13, so that driving circuit 12 or read circuit 13 and can be connected to sensing array 11 by data line 18.Reset circuit 16 and reset line 19 by a plurality of and be coupled to sensing array 11, each is reseted line 19 and couples wherein delegation's sensing cell.Note that each control line 17 also can be designed to couple wherein delegation's sensing cell of sensing array 11, each data line 18 and reset line 19 and then couple a row sensing cell respectively.
Fig. 2 is the thin portion circuit diagram of sensing cell 110, and it comprises a fingerprint electrode 111, a storage capacitors 112, and chooses switch 113, and reset switch 114, a control line 115, a data line 116, and reset a line 117 and a ground wire 118.Control line 115 be aforementioned a plurality of control lines 17 one of them, data line 116 be aforementioned a plurality of data lines 18 one of them, reset line 117 for aforementioned a plurality of reset line 19 one of them.Choose switch 113 and be coupled to 111 at data line 116 and fingerprint electrode, can receive a control signal, to control whether conducting from control line 115.Reset switch 114 and be coupled between fingerprint electrode 111 and the ground wire 118, can receive one and reset signal, to control whether conducting from reseting line 117.Choose switch 113 and reset switch 114 and can be transistor switch, as shown in Figure 2.Storage capacitors 112 is between fingerprint electrode 111 and ground wire 118, to form.Fingerprint electrode 111 can and finger between form an inductance capacitance 119 because human body can be considered earth terminal, thereby inductance capacitance 119 can form parallelly connected relation with storage capacitors 112, its equivalent capacitance value is both capacitance sums.
(1) detect line paddy: this moment equivalent capacitance value C
Eq1=C
s+ C
f
(2) detect wrinkle ridge: this moment equivalent capacitance value C
Eq2=C
s+ C
r
(3) do not have and to detect fingerprint: this moment equivalent capacitance value C
Eq3=C
s
Because C
fBe by C
1With C
2Be in series, so C
f<c
2=C
rTherefore:
C
Eq2>C
Eq1>C
Eq3Formula (1a)
Through type (1a), the sensing cell 110 distinguishable parts that whether detect fingerprint and detected are wrinkle ridge or line paddy, literary composition can detail after this part.Sensing cell 110 shown in Fig. 3 A and the 3B can be used thin film transistor (TFT) (Thin Film Transistor; TFT) processing, metal-oxide half field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor; MOSFET) mode such as processing is made; Do not have particular restriction, and the material of fingerprint electrode 110 and each insulation course there is not particular restriction yet.
Note that Fig. 3 A and 3B are merely an embodiment, the layout type of each element of sensing cell 110 is not limited to this, as long as layout type can be realized the circuit of the sensing cell 110 of Fig. 2, all belongs to scope of the present invention.For example, in another embodiment, can the insulation course 35 of Fig. 3 A and 3B be omitted, so, the inductance capacitance 119 that forms between fingerprint electrode 111 and line paddy among Fig. 3 A becomes C
1, storage capacitors 112 still is C
sAmong Fig. 3 B because fingerprint electrode 111 directly contacts with wrinkle ridge, so do not form inductance capacitance 119, and storage capacitors 112 also because of its two ends all ground connection do not play a role.Therefore, sensing cell 110 when detecting line paddy, equivalent capacitance value C
Eq1=C
s+ C
1When detecting wrinkle ridge, equivalent capacitance value C
Eq2=0; When not detecting fingerprint, equivalent capacitance value C
Eq3=C
s, also promptly:
C
Eq1>C
Eq3>C
Eq2Formula (1b)
Through type (1b), the also distinguishable part that whether detects fingerprint and detected of sensing cell 110 is wrinkle ridge or line paddy.
The function mode of fingerprint acquisition apparatus 10 (sees also Fig. 1 and Fig. 2) as follows:
(1) before carrying out fingerprint sensing, reset circuit 16 and reset line 19 by a plurality of and see off and reset signal to each sensing cell 110, it is reseted switch 114 conductings, the electric capacity in the sensing cell 110 can fully be discharged, make zero and the current potential of fingerprint electrode 111 forced.So, except removing the electric charge that sensing is last time left over, also can eliminate the static of finger surface and 111 existence of fingerprint electrode, and improve the immunity of 111 pairs of external static of fingerprint electrode.
(2) then, between a write area in, selecting circuit 15 sends control signal in regular turn by every control line 17, keeps conducting with the switch 113 of choosing of choosing each row sensing cell in the sensing array 11 in regular turn, make the sensing cell 110 that is selected.On the other hand, commutation circuit 14 switches to driving circuit 12 with a plurality of data lines 18 between this write area the time, makes driving circuit 12 see charging signals off by a plurality of data lines 18.So, the sensing cell 110 that is selected just can be chosen the said charging signals of data line 18 receptions that switch 113 is coupled by it, and the equivalent capacitys in the sensing cell 110 are charged, and also promptly carries out data and writes.
(3) after the said write interval; Selecting circuit 15 reads in the interval one and sends control signal in regular turn by every control line 17 once more; The switch 113 of choosing to choose each row sensing cell in the sensing array 11 in regular turn, to make the sensing cell 110 that is selected is kept conducting.On the other hand; Commutation circuit 14 switches to a plurality of data lines 18 when this reads the interval and reads circuit 13; Make read circuit 13 can be by choosing the data line 18 that switch 113 is coupled; Read the magnitude of voltage (in Fig. 2, also being the magnitude of voltage of fingerprint electrode 111) of the storage capacitors 112 of the sensing cell 110 that is selected.
Because each sensing cell 110 all has the switch of choosing 113, so have only elected taking away when closing 113 conductings, also be sensing cell 110 when being selected, just can carry out reading and writing data to it, so can avoid interfering with each other between adjacent sensing cell.
Fig. 4 is the sequential chart (timing diagram) of the coherent signal of fingerprint sensing apparatus 10.Wherein, time shaft (being transverse axis) is between write area and reads interval appearance repeatedly in regular turn.Control signal on each control line 17 (S1, S2, S3... represent the 1st, 2 respectively, the control signal on the 3... bar control line 17) between write area with read the interval and all occur in regular turn, to choose a row sensing cell in regular turn.Between write area; Each data line 18 all transmits charging signals (D1, D2... represent the 1st respectively, the charging signals on the 2... bar data line 18); So that control line 17 selected row sensing cells are charged, and the length in the duration of charging of each row sensing cell is the pulse width of control signal; Reading the interval, 18 of each data lines transmit the magnitude of voltage (V1, V2... represent the 1st respectively, the magnitude of voltage on the 2... bar data line 18) of the storage capacitors 112 that is read.Reset for every and reset signal R on the line 19, read extremity of an interval at each and occur, force with magnitude of voltage and make zero fingerprint electrode 111.Note that reseting signal R also can (figure does not show) occur at the head end between each write area, can reach same effect.
In the time of between write area, because each sensing cell 110 is to charge with same charging signals (like fixing magnitude of voltage), so can know the charge volume Q of a sensing cell 110 by electric weight (Q)=electric capacity (C) * voltage (V)
dBe to be directly proportional with the size of its equivalent capacitance value.Therefore, be covered with among the embodiment of insulation course 35 (seeing also Fig. 3 A and 3B) at sensing cell 110, can push away by aforesaid formula (1a):
Q
d() > when detecting wrinkle ridge; Q
d() > when detecting line paddy; Q
d(when nothing detects fingerprint) formula (2a)
When reading the interval, the magnitude of voltage of the storage capacitors 112 of the sensing cell 110 that is read (is the magnitude of voltage V of fingerprint electrode 111
f) be with previous write area between the time charge volume be directly proportional, therefore can push away by formula (2a):
V
f() > when detecting wrinkle ridge; V
f() > when detecting line paddy; V
f(when nothing detects fingerprint) formula (3a)
Therefore, the magnitude of voltage and the formula (3a) of the storage capacitors 112 of fingerprint acquisition apparatus 10 through reading each sensing cell 110 can judge that each sensing cell 110 has not detect fingerprint, and the fingerprint that is detected are that wrinkle ridge still is a line paddy.Fig. 5 shows the magnitude of voltage that is read from each sensing cell 110 of sensing array 11 (with 11 row * 10 behaviors example); Wherein high-voltage value (representative wrinkle ridge) is shown as H; Intermediate voltage value (representing line paddy) is shown as M; Low voltage value (representing no fingerprint) is shown as L, and the zone that bold line surrounded is fingerprint.
In like manner, in sensing cell 110 is covered with the embodiment of insulation course 35, in (being the situation that the embodiment of Fig. 3 A and 3B omits insulation course 35), can not pushing away according to formula (1b) and be able to down relational expression:
Q
d() > when detecting line paddy; Q
d() > when nothing detects fingerprint; Q
d(when detecting wrinkle ridge) formula (2b)
V
f() > when detecting line paddy; V
f() > when nothing detects fingerprint; V
f(when detecting wrinkle ridge) formula (3b)
The magnitude of voltage and the formula (3b) of the storage capacitors 112 through reading each sensing cell 110 can judge also that each sensing cell 110 has not detect fingerprint, and the fingerprint that is detected are that wrinkle ridge still is a line paddy.
Fig. 6 is the calcspar of second preferred embodiment of capacitance type fingerprint sensing apparatus of the present invention, and wherein, fingerprint acquisition apparatus 60 comprises that a sensing array 61, one drive circuit 62, read circuit 63, a selecting circuit 65 and is reseted circuit 66.Sensing array 61 comprises a plurality of sensing cells 610, and it is configured to several column and plural number row (be six row, six row among the figure, yet columns and line number not being as limit).Selecting circuit 65 is coupled to sensing array 61 by a plurality of first control lines 64 and second control line 67, and each first control line 64 couples a wherein row sensing cell respectively with each second control line 67.Driving circuit 62 is coupled to sensing array 61 by a plurality of first data lines 68; Each first data line 68 couples wherein delegation's sensing cell; Read circuit 63 and be coupled to sensing array 61 by a plurality of second data lines 69, each second data line 69 couples wherein delegation's sensing cell.Reset circuit 66 and reset line 661 by a plurality of and be coupled to sensing array 61, each is reseted line 661 and couples wherein delegation's sensing cell.
Fig. 7 is the thin portion circuit diagram of sensing cell 610, and the main difference of the sensing cell 110 of itself and Fig. 2 is, sensing cell 610 is set up a read switch 1131, a control line 1151 and a data line 1161. Control line 115,1151 be respectively aforementioned a plurality of first control lines 64 and second control line 67 one of them; Data line 116,1161 be respectively aforementioned a plurality of first data lines 68 and second data line 69 one of them, reset line 117 for aforementioned a plurality of reset line 661 one of them.Sensing cell 610 is with the main difference of sensing cell 110 in running; Sensing cell 610 will charge and the action branch that reads is carried out (being control line 115 and data line 116, control line 1151 and data line 1161) by two groups of control lines and data line, and sensing cell 110 is then carried out (being control line 115 and data line 116) by same group of control line and data line.Choose switch 113 and can receive first control signal from control line 115; With the whether conducting of 111 at control data line 116 and fingerprint electrode; And read switch 1131 can receive second control signal from control line 1151, with the whether conducting of 111 at control data line 1161 and fingerprint electrode.Reseting switch 114 can receive one and reset signal from reseting line 117, with the whether conducting of 118 of control fingerprint electrode 111 and ground wires.In addition, inductance capacitance 119 still forms parallelly connected relation with storage capacitors 112, and its equivalent capacitance value is both capacitance sums.
The function mode of fingerprint acquisition apparatus 60 (sees also Fig. 6 and Fig. 7) as follows:
(1) carry out the action of reseting before the fingerprint sensing, this part and fingerprint acquisition apparatus 10 are similar, please with reference to preamble, repeat no more here.
(2) then, in the time of between write area, selecting circuit 65 sends first control signal in regular turn by every first control line 64, keeps conducting with the switch 113 of choosing of choosing each row sensing cell in the sensing array 61 in regular turn, make the sensing cell 610 that is selected.See charging signals off by a plurality of first data lines 68 when on the other hand, driving circuit 62 is between this write area.So, the sensing cell 610 that is selected just can be chosen the said charging signals of first data line, 68 receptions that switch 113 is coupled by it, and the equivalent capacitys in the sensing cell 610 are charged, and also promptly carries out data and writes.
(3) after between write area; Selecting circuit 65 sends second control signal by every second control line 67 in regular turn in reading the interval; To choose each row sensing cell in the sensing array 61 in regular turn, make the read switch 1131 of the sensing cell 610 that is selected keep conducting.On the other hand, read second data line 69 that circuit 14 is coupled by read switch 1131 when this reads the interval, read the magnitude of voltage of the storage capacitors 112 of the sensing cell 610 that is selected.
Fig. 8 is the sequential chart of the coherent signal of fingerprint sensing apparatus 60.Wherein, time shaft (being transverse axis) is between write area and reads interval appearance repeatedly in regular turn.First control signal on each first control line 64 (S1-1, S1-2, S1-3... represent the 1st, 2 respectively, first control signal on 3... bar first control line 64) occurs between write area in regular turn, to choose a row sensing cell in regular turn; Second control signal on each second control line 67 (S2-1, S2-2, S2-3... represent the 1st, 2 respectively, second control signal on 3... bar second control line 67) occurs reading the interval in regular turn, to choose a row sensing cell in regular turn.Between write area, each first data line 68 all transmits charging signals (D1, D2... represent the 1st respectively, the charging signals on 2... bar first data line 68), so that first control line, 64 selected row sensing cells are charged; Reading the interval, 69 of each second data lines all transmit the magnitude of voltage (V1, V2... represent the 1st respectively, the magnitude of voltage on 2... bar second data line 69) of the storage capacitors 112 that is read.Reset for every and reset signal R on the line 661, read extremity of an interval at each and occur, force with magnitude of voltage and make zero fingerprint electrode 111.Note that reseting signal R also can (figure does not show) occur at the head end between each write area, can reach same effect.
In this second preferred embodiment, fingerprint acquisition apparatus 60 also can be carried out data and write and read in same interval, (code name of each signal is identical with Fig. 8 among Fig. 9) as shown in Figure 9.Compare with Fig. 8, Fig. 9 is on time shaft, and with to read the interval be to be same interval, and with regard to same row sensing cell, first control signal (writing in order to log-on data) is to occur early than second control signal (reading in order to log-on data) between write area.
Note that in first and second preferred embodiment write fashionablely carrying out data, selecting circuit 15 and 65 is not limited to once only choose a row sensing cell, also can choose the multiple row sensing cell simultaneously and carry out and write.
Fig. 1,6 fingerprint acquisition apparatus 10,60 also can be used to carry out touch controllable function, use to be used as Trackpad (touch pad).See also Fig. 5; After fingerprint acquisition apparatus 10,60 reads magnitude of voltage from each sensing cell 110,610,, also can, the zone that detects fingerprint set a RP ((x capable of using in being arranged except judging whether to detect wrinkle ridge or the line paddy; Y) coordinate is represented), the central point of finger-print region for example.Through comparing the RP in the finger-print region of different time points, just can judge the position and the moving direction of finger.In addition, because sensing array 11,61 can large-area mode be done in fact, therefore also can detect a plurality of fingerprints simultaneously, and have the function of multi-point touch (multi-touch).But,, can not differentiate wrinkle ridge and line paddy and need not be accurate to owing to when carrying out touch controllable function, only need to judge the position of finger, thus the required sensing cell density (also being the sensing cell number of unit area) of touch controllable function than the fingerprint sensing function required be low.So; The present invention proposes a kind of contactor control device of tool fingerprint sensing; It has a plurality of sensing cells (can be sensing cell 110 or 610), is configured to a fingerprint sensing district and a Touch Zone respectively, and the sensing cell density in said fingerprint sensing district is higher than the sensing cell density of said Touch Zone; So fingerprint sensing and touch controllable function can be provided simultaneously, and reduce the integrated circuit cost.Figure 10 shows an instance, can find out that the sensing cell density in fingerprint sensing district is higher than the Touch Zone.
Figure 11 is the process flow diagram of a preferred embodiment of fingerprint sensing method of the present invention, and it comprises the following step:
Step 1100: a plurality of sensing cells are provided; Be configured to one and have several column and plural sensing array of going; Each sensing cell comprises a fingerprint electrode and a storage capacitors; Said storage capacitors is coupled to said fingerprint electrode, and a formed inductance capacitance is to be parallel to said storage capacitors between said fingerprint electrode and finger.
Step 1101: carry out and to reset action, make zero with current potential with the fingerprint electrode of each sensing cell.
Step 1102: choose each row sensing cell in the said sensing array between a write area in regular turn.
Step 1103: provide a charging signals to the sensing cell that is selected in the said write interval, so that the equivalent electric capacity in the sensing cell is charged, wherein, said equivalent capacitance value is to have according to sensing cell not form inductance capacitance and decide.
Step 1104: read one and to choose each row sensing cell in the said sensing array in the interval in regular turn.
Step 1105: read the magnitude of voltage that the storage capacitors of the sensing cell that is selected is read in the interval said.
In the step 1100, also an insulation course can be provided, be covered in said sensing array, as the surface of contact of finger, to help forming inductance capacitance.
In this preferred embodiment, read the interval and be positioned between write area after, so can guarantee each row sensing cell executed data write activity before execution is read.In another embodiment; Read between interval and write area is to be positioned at same interval; And for same row sensing cell, step 1102 and 1103 is to carry out with 1105 early than step 1104, to guarantee said row sensing cell executed data write activity before execution is read.
More than explanation is just illustrative for the purpose of the present invention, and nonrestrictive, those of ordinary skills understand; Under the situation of spirit that does not break away from following accompanying claims and limited and scope, can make many modifications, change; Or equivalence, but all will fall in protection scope of the present invention.
Claims (8)
1. fingerprint acquisition apparatus is characterized in that it comprises:
A plurality of sensing cells; These a plurality of sensing cells are to be configured to one to have several column and plural sensing array of going; Each said sensing cell comprises a fingerprint electrode, one first switch is coupled to this fingerprint electrode, reaches a storage capacitors; Said storage capacitors is coupled to said fingerprint electrode, and a formed inductance capacitance is to be parallel to said storage capacitors between a said fingerprint electrode and a finger;
One drive circuit; Be coupled to said a plurality of sensing cell, in order to a charging signals to be provided, an equivalent electric capacity of each said sensing cell charged; Wherein, the said equivalent capacitance value of arbitrary said sensing cell is to have according to said sensing cell not form said inductance capacitance and decide;
One reads circuit, is coupled to said a plurality of sensing cell, in order to after the said equivalent capacity charging of arbitrary said sensing cell, reads the magnitude of voltage of the said storage capacitors of said sensing cell;
One selecting circuit; Be coupled to said sensing array; In order between a write area, to read and choose each row sensing cell in the said sensing array in the interval respectively in regular turn with one; The said write interval is positioned at said reading before the interval, and said selecting circuit is to be coupled to said sensing array through a plurality of control lines, and each said control line is coupled to a wherein row sensing cell of said sensing array; And
One switches circuit, is coupled to said driving circuit and the said circuit that reads, and said commutation circuit is to be coupled to said sensing array by a plurality of data lines, and each said data line is coupled to wherein delegation's sensing cell of said sensing array; In addition, this of each sensing cell first switch is coupled between said a plurality of data lines one of them and said fingerprint electrode, and one of them receives a control signal to said first switch from said a plurality of control lines, to control whether conducting;
Wherein, said driving circuit is to provide said charging signals to the sensing cell that is selected in the said write interval, and the said circuit that reads is to read the magnitude of voltage that the said storage capacitors of the sensing cell that is selected is read in the interval said;
Wherein, said commutation circuit switches to said driving circuit with said a plurality of data lines when said write is interval, said a plurality of data lines is switched to the said circuit that reads said when reading the interval;
Wherein, when said write was interval, the said first switch keeping conducting of the sensing cell that is selected received said charging signals with the data line that is coupled by said first switch; When reading the interval, the said first switch keeping conducting of the sensing cell that is selected is so that the said circuit that reads is read by the data line that said first switch is coupled said.
2. fingerprint acquisition apparatus according to claim 1 is characterized in that, each said sensing cell more comprises one the 3rd switch, is coupled between a said fingerprint electrode and the ground wire, and said fingerprint acquisition apparatus more comprises:
One resets circuit, is coupled to said a plurality of sensing cell, resets signal to said a plurality of sensing cell in order to provide one, with the whether conducting of said the 3rd switch of controlling said a plurality of sensing cells.
3. fingerprint acquisition apparatus according to claim 2; It is characterized in that said the 3rd switch of arbitrary said sensing cell is to provide said charging signals to the said sensing cell or saidly keep conducting after reading the magnitude of voltage of said storage capacitors that circuit reads said sensing cell in said driving circuit.
4. fingerprint acquisition apparatus according to claim 1 is characterized in that, when arbitrary said sensing cell has when forming said inductance capacitance, the said equivalent capacitance value of said sensing cell is to decide according to said storage capacitors value and said inductance capacitance value sum.
5. the contactor control device of a tool fingerprint sensing is characterized in that, it comprises:
A plurality of sensing cells; Said a plurality of sensing cell is to be configured to one to have several column and plural sensing array of going; Each said sensing cell comprises a fingerprint electrode, one first switch is coupled to this a fingerprint electrode and a storage capacitors; Said storage capacitors is coupled to said fingerprint electrode, and a formed inductance capacitance is to be parallel to said storage capacitors between a said fingerprint electrode and a finger;
One drive circuit; Be coupled to said a plurality of sensing cell, in order to a charging signals to be provided, an equivalent electric capacity of each sensing cell charged; Wherein, the said equivalent capacitance value of arbitrary said sensing cell is to have according to said sensing cell not form said inductance capacitance and decide;
One reads circuit, is coupled to said a plurality of sensing cell, in order to after the said equivalent capacity charging of arbitrary said sensing cell, reads the magnitude of voltage of the said storage capacitors of said sensing cell;
One selecting circuit is coupled to said sensing array, and in order between a write area, to read and choose each row sensing cell in the said sensing array in the interval respectively in regular turn with one, the said write interval is positioned at said reading before the interval; Wherein said selecting circuit is to be coupled to said sensing array by a plurality of control lines, and each said control line is coupled to a wherein row sensing cell of said sensing array;
One switches circuit, is coupled to said driving circuit and the said circuit that reads, and said commutation circuit is to be coupled to said sensing array by a plurality of data lines, and each said data line is coupled to wherein delegation's sensing cell of said sensing array; This first switch of each sensing cell in addition is coupled between said a plurality of data lines one of them and said fingerprint electrode, and one of them receives a control signal to said first switch from said a plurality of control lines, to control whether conducting;
Wherein, said driving circuit is to provide said charging signals to the sensing cell that is selected in the said write interval, and the said circuit that reads is to read the magnitude of voltage that the said storage capacitors of the sensing cell that is selected is read in the interval said;
Wherein, said commutation circuit switches to said driving circuit with said a plurality of data lines when said write is interval, said a plurality of data lines is switched to the said circuit that reads said when reading the interval;
Wherein, when said write was interval, the said first switch keeping conducting of the sensing cell that is selected received said charging signals with the data line that is coupled by said first switch; When reading the interval, the said first switch keeping conducting of the sensing cell that is selected is so that the said circuit that reads is read by the data line that said first switch is coupled said;
Wherein, said a plurality of sensing cells are to be configured to a fingerprint sensing district and a Touch Zone, and the sensing cell density in said fingerprint sensing district is higher than the sensing cell density of said Touch Zone.
6. the contactor control device of tool fingerprint sensing according to claim 5 is characterized in that, each said sensing cell more comprises one the 3rd switch, is coupled between a said fingerprint electrode and the ground wire, and said contactor control device more comprises:
One resets circuit, is coupled to said a plurality of sensing cell, resets signal to said a plurality of sensing cell in order to provide one, with the whether conducting of said the 3rd switch of controlling said a plurality of sensing cells.
7. the contactor control device of tool fingerprint sensing according to claim 6; It is characterized in that said the 3rd switch of arbitrary said sensing cell is to provide said charging signals to the said sensing cell or saidly keep conducting after reading the magnitude of voltage of said storage capacitors that circuit reads said sensing cell in said driving circuit.
8. the contactor control device of tool fingerprint sensing according to claim 5; It is characterized in that; When arbitrary said sensing cell has when forming said inductance capacitance, the said equivalent capacitance value of said sensing cell is to decide according to said storage capacitors value and said inductance capacitance value sum.
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