TWI549068B - Fingerprint Identifying Touch Device and Coordinates Calculating Method Thereof - Google Patents

Description

Touch device with fingerprint identification and coordinate calculation method thereof

The present invention relates to a coordinate computing method for a touch device, and more particularly to a coordinate computing method for a touch device with fingerprint recognition.

At present, some electronic devices are provided with a fingerprint recognizer 60 to prevent the electronic device from being stolen. In the case of a notebook computer, the position of the fingerprint recognizer 60 can be set on the keyboard main body casing 50, as shown in FIG. 8A, and disposed on the keyboard. At the right corner of the main casing 50, there is also a design integrated between the left and right buttons 611, 612 on the lower side of the touch device 61, as shown in Fig. 8B. Regardless of the type of setting, the design of the keyboard main body housing 50 needs to be changed.

Therefore, as shown in Fig. 8C, a manufacturer has proposed a touch device 61' incorporating a fingerprint recognizer 60, so that it is not necessary to change the design of the keyboard main body casing 50. In order to avoid affecting the touch device 61' to recognize the touch object on the touch detection area A, the fingerprint recognizer 60 is mainly disposed at a corner position of the touch detection area A. However, when the touch device 61' detects the touch object, when the touch object touches the fingerprint recognizer 60, the touch device 61' cannot detect and recognize the touch coordinate, causing the break. The line or misjudgment gesture; therefore, the setting of the fingerprint recognizer 60 will affect the coordinate position calculation and gesture discrimination of the touch device 61', and there is still a need for further improvement.

In view of the above-mentioned prior art touch device directly adding a fingerprint identifier thereon, the technical defect of touching the touch object on the fingerprint identifier cannot be detected, and the main object of the present invention is to provide a touch with fingerprint identification. Control device and its coordinate calculation method to improve this technical defect.

The main technical means for achieving the above-mentioned purpose is that the touch-sensitive touch device includes a touch body and a fingerprint recognizer, and the touch object and the fingerprint recognizer together form a touch detection area. The touch body includes a plurality of sensing units, and the fingerprint identifier includes a plurality of pixel electrodes, wherein the coordinate computing method comprises: (a) reading a plurality of first capacitive sensing quantities of the plurality of sensing units of the touch body respectively And a plurality of second capacitive sensing quantities of the plurality of pixel electrodes of the fingerprint identifier; (b) dividing the plurality of pixel electrodes into a plurality of pixel sensing groups, and obtaining a plurality of corresponding numbers representing the plurality of pixel sensing groups a three-capacitance sensing quantity, wherein each of the pixel sensing groups includes at least two pixel electrodes, and each of the third capacitance sensing amounts is calculated by a second capacitance sensing amount of the at least two pixel electrodes in the pixel sensing group And (c) performing a coordinate operation of the touch object based on the plurality of first capacitive sensing amounts and the plurality of third capacitive sensing amounts.

The main technical means for achieving the above purpose is that the touch-sensitive touch device comprises: a touch body comprising a plurality of sensing units and a touch sensing circuit, wherein the touch sensing circuit is electrically connected The plurality of sensing units have a built-in standard operation program; and a fingerprint identifier includes a plurality of pixel electrodes and a readout circuit; the readout circuit is electrically connected to the plurality of pixel electrodes and the touch sensor In the circuit, the touch body and the fingerprint identifier together form a touch detection area; and the touch sensing circuit executes the coordinate operation program, which includes the following steps: (a) reading a plurality of first capacitive sensing amounts of the plurality of sensing units of the touch body, and a plurality of second capacitive sensing amounts of the plurality of pixel electrodes of the fingerprint identifier; (b) via the touch The sensing circuit divides the plurality of pixel electrodes into a plurality of pixel sensing groups, and obtains a plurality of third capacitive sensing quantities corresponding to the plurality of pixel sensing groups, wherein each of the pixel sensing groups includes at least two pixel electrodes, each of which The third capacitance sensing amount is calculated by a second capacitance sensing amount of the at least two pixel electrodes in the pixel sensing group; and (c) according to the plurality of first capacitance sensing amounts and the plurality of third capacitances The amount of sensing performs the coordinate operation of the touch object.

According to the touch device and the coordinate calculation method of the present invention, the fingerprint recognition device occupies a part of the touch detection area, so when the touch object scans the touch detection area The present invention simultaneously reads the second capacitive sensing amount of the fingerprint identifier, and calculates a third capacitive sensing amount to compensate for the capacitive sensing amount that is missing due to the setting of the fingerprint identifier after the touch body is scanned. The touch body can obtain the capacitive sensing amount of the complete touch detection area, and solve the problem that the touch object cannot pass through the fingerprint identifier, and the complete path of the touch object cannot be detected; in other words, the touch can be detected by the present invention. Touch the touch coordinates of the object on the detection area.

10‧‧‧ touch device

20‧‧‧Touch body

201‧‧‧First board

21‧‧‧Sensor unit

211‧‧‧x-axis sensing electrode

212‧‧‧y-axis sensing electrode

22‧‧‧Touch sensing circuit

221‧‧‧ receiving unit

222‧‧‧Master controller

223‧‧‧Signal Processing Unit

30‧‧‧Finger identifier

301‧‧‧Second circuit board

31‧‧‧pixel electrode

32‧‧‧Readout circuit

40‧‧‧Touch objects

A‧‧‧ Touch detection area

A1‧‧‧ first area

A2‧‧‧Second area

50‧‧‧ Shell

60‧‧‧Finger identifier

61, 61'‧‧‧ touch devices

611‧‧‧Left button

612‧‧‧right button

1A is a top plan view of a first embodiment of a touch device of the present invention.

FIG. 1B is a top plan view of a second embodiment of the touch device of the present invention.

2A is a side elevational view of a third embodiment of the touch device of the present invention.

2B is a side elevational view of a fourth embodiment of the touch device of the present invention.

2C is a side elevational view of a fifth embodiment of the touch device of the present invention.

Fig. 3A is a partial enlarged view of Fig. 1.

Fig. 3B is a partial enlarged view of Fig. 3A.

4A is a functional block diagram of the touch sensing circuit and the readout circuit of the present invention.

4B is another functional block diagram of the touch sensing circuit and the readout circuit of the present invention.

FIG. 5A is a sensing frame of the first capacitive sensing amount of the complex sensing unit of the touch sensing circuit of the present invention.

Figure 5B: The sensor frame after compensation in Figure 5A.

Figure 5C: Inductive frame to be normalized in the present invention.

FIG. 6A is a sensing frame of the second capacitive sensing amount of the plurality of pixel electrodes read by the readout circuit of the present invention.

FIG. 6B: FIG. 6A corresponds to a sensing frame of a complex image sensing group range.

FIG. 7A is a schematic diagram of the second initial capacitance sensing amount of the complex image sensing group calculated by the touch device of the present invention under the non-touching object.

FIG. 7B is a schematic diagram of the second touch capacitance sensing amount of the complex image sensing group calculated by the touch device of the present invention under the non-touch object.

FIG. 7C: The touch device of the present invention calculates a sensing frame of the third capacitive sensing amount.

FIG. 7D is a sensing frame of the third capacitive sensing amount after the normalization procedure of FIG. 7C.

Figure 8A is a schematic illustration of a keyboard mainframe housing having both a notebook computer.

Figure 8B is a schematic illustration of another keyboard mainframe housing having both a notebook computer.

Figure 8C is a schematic illustration of another keyboard mainframe housing having both a notebook computer.

The invention provides a touch device with fingerprint recognition, which can detect the coordinates of a touch object touched on a fingerprint identifier.

Referring to FIG. 1A, a first embodiment of a fingerprint device 10 with fingerprints is provided, which includes a touch body 20 and a fingerprint identifier 30, the touch body 20 and the fingerprint. The identifiers 30 are combined to form a touch detection area A. The touch detection area A includes a first area A1 and a second area A2. The touch body 20 is correspondingly disposed in the first area A1. The fingerprint identifier 30 is correspondingly disposed in the second area A2. In this embodiment, the second area A2 is located at a corner of the touch detection area A, and the second area A2 is located in the touch detection area A. The middle position of the side, but not limited to this.

Referring to FIG. 2A, the touch body 20 includes a plurality of sensing units 21 and a touch sensing circuit 22 with a built-in standard operating program. The plurality of sensing units 21 are corresponding to the touch detection. The first area A1 of the area A is formed on an upper surface of a circuit board 201 and covered by a first protection layer 23, and the touch sensing circuit 22 is electrically connected to the plurality of sensing units 21 via the circuit board 201. connection. The fingerprint identifier 30 includes a plurality of pixel electrodes 31 and a readout circuit 32. The plurality of pixel electrodes 31 correspond to the second area A2 of the touch detection area A, and are formed on a wafer 302. Covered by the second protective layer 33, the readout circuit 32 is located in the chip 302 and electrically connected to the plurality of pixel electrodes 31. The wafer 302 is fixed on a substrate 301 and transmitted through the substrate 301 and the circuit. The board 201 is electrically connected such that the readout circuit 32 is electrically coupled to the touch sensing circuit 22. In order to avoid the influence of the boundary between the first and second protective layers 23, 33 on the sliding of the finger, in an embodiment, the upper surfaces of the first and second protective layers 23, 33 are flush, and the first The boundary between the first and second protective layers 23, 33 affects the feel of the finger sliding.

In other embodiments, as shown in FIG. 2B, the substrate 301 is corresponding to the second area A2 of the touch detection area A, and is directly disposed on the upper surface of the circuit board 201, through the pads thereon. (not shown) soldering pads (not shown) corresponding to the circuit board 201 are soldered to electrically connect the readout circuit 32 to the touch sensing circuit 22. Alternatively, as shown in FIG. 2C, the circuit board 201 and the substrate 301 share the same circuit board, so that the readout circuit 32 and the touch sensing circuit 22 can be electrically connected to each other.

Referring to FIG. 3A , which is a partial enlarged view of FIG. 1A , the plurality of sensing units 21 of the touch body 20 are arranged in a matrix; and as shown in FIG. 3B , the diamond-shaped sensing electrode pattern is For example, the length of each of the sensing units 21 in the x-axis direction (hereinafter referred to as the length) is the distance D1 between the two adjacent half-s-axis sensing electrodes 211 covered by the sensing unit 21, and the width thereof in the y-axis direction. (hereinafter referred to as width) is the distance D2 between two adjacent half of the y-axis sensing electrodes 212, wherein the distances D1 and D2 are respectively 4 mm to 5 mm; and the plurality of pixel electrodes 31 of the fingerprint reader 30 The array is arranged in a matrix. For the 508 dpi fingerprint identifier 30, each of the pixel electrodes 31 has a size of 50 um*50 um. For convenience of the following description, it is assumed that the touch body 20 includes a 10*14 sensing unit 21, and the fingerprint recognizer 30 includes a 10*10 pixel electrode 31, but is not limited thereto. As shown in FIG. 1A, if the 10*10 pixel electrode 31 of the fingerprint identifier 30 disposed in the second area A2 is in the unit area of one sensing unit 21, the second area A2 can be roughly divided into 3*3 units. The array area of the sensing unit 21 is such that the 10*10 pixel electrode 31 can be correspondingly divided into nine pixel sensing groups G11 to G33. Moreover, since the non-inductive frame 33 having a certain width W around the fingerprint identifier 30 is affected by the non-inductive frame 33, except that the area of the pixel sensing group G22 can correspond to the area of the sensing unit 21, the other The pixel sensing group is smaller than the area of the sensing unit 21, and thus the pixel sensing groups G11 to G33 may include an unequal number of pixel electrodes 31. For example, the pixel sensing group G11 includes 3*3 pixel electrodes 31, The pixel sensing group G12 includes 3*4 pixel electrodes 31 or the pixel sensing group G22 includes 4*4 pixel electrodes 31. Therefore, in an embodiment, the arrangement relationship between the pixel sensing groups G11 G G33 and the sensing unit 21 is as shown in FIG. 3A , wherein at least one x-axis side of each of the pixel sensing groups G11 G G33 and at least One y-axis side is aligned with the opposite side of its corresponding sensing unit 21.

Referring to FIG. 4A , an embodiment of the touch sensing circuit 22 includes a receiving unit 221 and a main controller 222 . The main controller 222 receives the sensing unit through the receiving unit 221 . The first capacitive sensing amount of 21, when the main controller 222 scans all the sensing units 21, a sensing frame as shown in FIG. 5 is obtained, but the Ty1~Ty3 of the sensing frame are interleaved with Tx1~Tx3. The nine locations do not contain the first capacitive inductance. The readout circuit 32 receives the second capacitive inductance of each of the pixel electrodes 31 to obtain a sensing frame as shown in FIG. 6A. In this embodiment, due to The readout circuit 32 is electrically connected to the main controller 222 of the touch sensing circuit 22, so that the second capacitive sensing amount of each of the pixel electrodes 31 can be transmitted to the main controller 222, and the main controller 222 can be The plurality of pixel electrodes 31 are arranged to correspond to the pixel sensing groups G11 to G33 shown in FIG. 3A, so that the sensing frame of FIG. 6A can be divided according to the sensing frame shown in FIG. 6B, that is, corresponding to FIG. 3A. The second capacitive sensing amount of the nine pixel electrodes 31 included in the pixel sensing group G11 is nine second capacitive sensing amounts interleaved by Py1~Py3 and Px1~Px3 in FIG. 6B, and the second group of pixel sensing groups G12 The second capacitive sensing amount of the twelve pixel electrodes 31 included is twelve second capacitive sensing amounts interleaved by Py4~Py7 and Px1~Px3 in FIG. 6B, and nine included in the third group of pixel sensing groups G13. The second capacitive sensing amount of the pixel electrode 31 is nine second capacitive sensing amounts interleaved by Py8~Py10 and Px1~Px3 in FIG. 6B, and so on; therefore, the main controller 222 obtains all the pixel electrodes After the second capacitive sensing amount of 31, the complex corresponding to each group of pixel sensing groups G11~G33 can be further Pixel electrode of the second capacitive sensing an amount of 31, respectively, representing the set of pixels calculated inductive capacitive sensing an amount of the third group G11 ~ G33 is. Therefore, the main controller 222 can obtain the third capacitive sensing amount of the nine groups of pixel sensing groups G11 G G33 located in the second area A2 as shown in FIG. 1A, thereby compensating for the nine missing in the sensing frame shown in FIG. 5A. The first capacitive sensing component forms a complete sensing frame, and the main controller 222 distinguishes the touch coordinates of the touch object at any position on the touch detection area A shown in FIG. 1A according to the complete sensing frame.

Referring to FIG. 3A and FIG. 4B , another embodiment of the touch sensing circuit 22 also includes the receiving unit 221 and the main controller 222 of FIG. 4B , but the main controller 222 is transparent. A signal processing unit 223, such as a digital processor (DSP), a single chip or processor, is electrically coupled to the readout circuit 32. Therefore, the signal processing unit 223 corresponds to the pixel sensing groups G11 to G33 as shown in FIG. 3A according to the setting, and after obtaining the second capacitance sensing amount of all the pixel electrodes 31, Further, a third capacitance sensing amount representing the group of pixel sensing groups G11 to G33 is calculated by using a second capacitance sensing amount of the plurality of pixel electrodes 31 corresponding to each group of pixel sensing groups G11 to G33, and then each of the third The capacitive sensing amount is transmitted to the main controller 222. Therefore, the embodiment The main controller 222 can obtain the third capacitive sensing amount of the nine groups of pixel sensing groups G11 G G33 located in the second area A2 from the signal processing unit 223 to compensate for the lack of nine sensing frames shown in FIG. 5A. The first capacitance senses the amount and forms a complete sensing frame.

An embodiment of the calculation method of the third capacitive sensing amount is further described below. First, referring to FIG. 7A, when the touch device 10 does not touch the object, the plurality of fingerprint recognizers 30 are read. The capacitance change amount of the pixel electrode 31 is used as the second initial capacitance sensing amount, and the second initial capacitance sensing amounts of the plurality of pixel electrodes 31 in the pixel sensing groups G11 to G33 are added and averaged (or first binarized) After adding), as a reference value. As shown in FIG. 7B, when the touch object 40 (such as a finger) touches the fingerprint reader 30, a plurality of capacitance changes of the plurality of pixel electrodes 31 of the fingerprint reader 30 are read as the first The two touch capacitance sensing amounts, that is, each second touch capacitance sensing amount corresponds to one pixel electrode. Next, the second touch capacitance sensing amounts of the plurality of pixel electrodes 31 in each of the pixel sensing groups G11 to G33 are added and averaged (or first binarized and then added) as an sensing value. Each pixel sensing group corresponds to a sensing value; then, the reference value of each of the pixel sensing groups G11 G G33 and the difference of the sensing values are calculated, as shown in FIG. 7C, and the difference is used as each pixel sensing group. The third capacitive inductance of G11~G33.

The second capacitive sensing amount of each of the pixel electrodes 31 may be different from the first capacitive sensing amount of each of the sensing units 21; therefore, each of the third capacitive sensing amounts obtained by the pre-extraction operation may be further performed. A formalization procedure. The normalization procedure is a numerical distribution range in which the third capacitive sensing amount of each of the pixel sensing groups G11 to G33 can correspond to the capacitive sensing amount of the sensing unit 21, and in this embodiment, the pixel sensing group G11 is used. A predetermined proportional value corresponding to ~G33, multiplying the third capacitance sensing amount of each of the pixel sensing groups G11 to G33 by the proportional value, and letting the calculated sensing amount be regarded as the sensing unit 21 A capacitive sensing amount is used, as shown in FIG. 7D, so that the third capacitive sensing amount can be used to compensate for the nine first capacitors missing from the sensing frame shown in FIG. 5A. The sensing amount is configured as a complete sensing frame as shown in FIG. 5B, so coordinate calculation and gesture recognition of the touch detection area A can be performed.

The scale value of the preset preset can be touched by one of the sensing units 21 and one of the pixel sensing groups G11, G12, ..., G33 via a standard touch object (for example, a weight of a simulated finger touch). An inductive capacitance and the third capacitance are the highest (peak), and the first inductive capacitance is divided by the third inductive capacitance to obtain a ratio, which is the pixel sensing group touched by the standard touch object. The preset scale value. After the standard touch object touches all the pixel sensing groups G11, G12, . . . , G33, the corresponding third capacitive sensing amount is obtained, and the ratio obtained by dividing the first sensing capacitance separately is obtained for each pixel sensing group. The preset scale value. The preset scale values can be stored in a table.

As shown in FIG. 3A , the non-inductive frame 33 is located between the touch body 20 and the fingerprint recognizer 30 . In order to compensate the first capacitive sensing amount lacking in FIG. 5A and to maintain better linearity or signal quality, the third capacitive sensing amount of each of the pixel sensing groups G11 to G33 can further be compared with the surrounding A capacitive sensing amount is calculated by the following calculation formula, and then compensates for the first capacitive sensing amount lacking in FIG. 5A: RdV _{i , j} = a + b × dV _{i , j} + c 1 × dV _{i -1, j - 1} + c ² × dV _{i -1, j} + c 3 × dV _{i -1, j +1} + c 4* dv _{i , j -1} + c 5 × dv _{i , j +1} + c 6 × dv _{i + 1, j -1} + c 7 × dv _{i +1, j} + c 8 × dv _{i +, j +1} ; wherein: RdV _i,j is the third capacitive inductance of the pixel sensing group after normalization; dV _{i, j} is the third capacitive sensing quantity of the current pixel sensing group; a is the normal value of the constant current component; b is the difference between the third capacitive sensing quantity of the current pixel sensing group and the first capacitive sensing quantity of one sensing unit; The specific gravity; and c1~c8 are the relationship between the pixel sensing group to be normalized and the first capacitive sensing amount of the surrounding sensing unit.

Taking FIG. 3A as an example, when a touch object touches the touch device, the third, sixth, and nine-pixel sensing groups in the fingerprint recognizer 30 are relatively easy to be touched simultaneously with the peripheral sensing unit, and The sensing frame 33 has a certain width W interval. Therefore, if the third capacitance sensing amount dV _{2,3 of the} fifth pixel sensing group G23 of FIG. 5C is normalized, the normalized third is obtained. The capacitance sensing amount RdV _2,3 is: RdV _2,3 = a+b*1785+c1*92+c2*(-26)+c3*0+c4*2966+c5*0+c6*2778+c7*2626 +c8*51; Since the interface area between the fifth pixel sensing group G23 and the right sensing unit is large, the above formula can also be simplified as: RdV _2,3 = a+b*1785+c5*0; decisions about b and c5 ,described as follows.

C5 can also touch two sensing units (2, 4) and (1, 4) respectively by a standard touch object. When touching the sensing unit (2, 4), the sensing unit (2, 4) The capacitance sensing values of the two adjacent left and right sensing units should be approximately the same, so a binary equation can be arranged: b*dV _2,3 +c5* dV _2,4 =dV _2,5 ; where dV _{2, 3} , dV _2,4 , dV _2,5 is known after touching by standard touch objects; in order to obtain unknown b and c5, then touch the standard touch object to another sensing unit (1,4) ), another set of dV _2,3 , dV _2,4 , dV _2,5 will be obtained at this time, so another binary one-time equation can be sorted out, and b is obtained after solving the simultaneous equation with the previous binary method. C5. Similarly, c1~c4 and c6~c8 can also be obtained in the same way.

In summary, the touch device of the present invention integrates the fingerprint recognizer 30, and the fingerprint recognizer 30 occupies the second area A2 of the touch detection area A. When the area A is detected, the second capacitive sensing amount of the fingerprint identifier 30 is also read, and the third capacitive sensing amount is calculated, thereby compensating for the setting of the fingerprint identifier 30 after the scanning of the touch body 20 The missing capacitive sensing information enables the touch body 20 to obtain a complete capacitive sensing amount of the touch detecting area A, and the conventional device passes through the fingerprint identifier 30 due to the moving path of the touch object 40. The complete path of the touch object cannot be detected; in other words, the touch coordinates of the touch object 40 on the touch detection area A can be detected.

Therefore, the coordinate calculation method of the touch device of the present invention includes: (a) reading a plurality of first capacitive sensing amounts of the plurality of sensing units of the touch body, and a plurality of pixel electrodes of the fingerprint identifier a second capacitive sensing amount; (b) dividing the plurality of pixel electrodes into a plurality of pixel sensing groups, and obtaining a third capacitive sensing amount corresponding to the plurality of pixel sensing groups, wherein each of the pixel sensing groups includes at least two a pixel electrode, each of the third capacitance sensing amount is calculated by a second capacitance sensing amount of the at least two pixel electrodes in the pixel sensing group; and (c) according to the plurality of first capacitance sensing amounts and The plurality of third capacitive sensing amounts perform coordinate operations of the touch object.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the present invention. The present invention has been disclosed by the embodiments, but is not intended to limit the invention, and any one of ordinary skill in the art, In the scope of the technical solutions of the present invention, equivalent modifications may be made to the equivalents of the embodiments of the present invention without departing from the technical scope of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

22 Touch sensing circuit 221 Receiving unit 222 Main controller 30 Fingerprint reader

Claims (13)

A coordinate computing method for a touch-sensing touch device, the touch device includes a touch body and a fingerprint recognizer, the touch body and the fingerprint recognizer together form a touch detection area, and the touch The body includes a plurality of sensing units, and the fingerprint identifier includes a plurality of pixel electrodes, wherein the method comprises: (a) respectively reading a plurality of first capacitive sensing quantities of the plurality of sensing units of the touch body, and the fingerprint identification a plurality of second capacitive sensing quantities of the plurality of pixel electrodes; (b) dividing the plurality of pixel electrodes into a plurality of pixel sensing groups, and obtaining a plurality of third capacitive sensing amounts corresponding to the plurality of pixel sensing groups, Each of the pixel sensing groups includes at least two pixel electrodes, and each of the third capacitance sensing amounts is calculated by a second capacitance sensing amount of the at least two pixel electrodes in the pixel sensing group; and (c) And performing coordinate operations on the touch object according to the plurality of first capacitive sensing quantities and the plurality of third capacitive sensing amounts. The coordinate operation method of claim 1, wherein reading the second capacitive sensing quantity of the plurality of pixel electrodes of the fingerprint identifier in the step (a) further comprises the following steps: (a1) reading the fingerprint identifier The capacitance change amount of the plurality of pixel electrodes is used as a second initial capacitance sensing amount when the object is not touched; and (a2) the capacitance change amount of the plurality of pixel electrodes when the fingerprint identifier is read on the touch object As the second touch capacitance sensing amount. The coordinate calculation method according to claim 2, wherein the third capacitance sensing quantity of each pixel sensing group in the step (b) is further calculated by the following steps: (b1) the complex number in each pixel sensing group The second initial capacitance sensing amounts of the pixel electrodes are added and averaged as a reference value; (b2) adding the second touch capacitance sensing amounts of the plurality of pixel electrodes in each of the pixel sensing groups to average, as an sensing value; and (b3) calculating the reference value of each of the pixel sensing groups and The difference between the sensing values, that is, the third capacitance sensing amount representing each of the pixel sensing groups. The coordinate calculation method according to claim 2, wherein the third capacitance sensing quantity of each pixel sensing group in the step (b) is further calculated by the following steps: (b1) the complex number in each pixel sensing group The second initial capacitance sensing amounts of the pixel electrodes are respectively binarized and added as a reference value; (b2) the second touch capacitance sensing amounts of the plurality of pixel electrodes in each pixel sensing group are respectively binary And summing up as a sensing value; and (b3) calculating the difference between the reference value and the sensing value of each pixel sensing group, the difference being the third capacitance sensing amount representing each of the pixel sensing groups . The coordinate calculation method according to claim 1, before performing the step (c), performing a normalization procedure on the third capacitance sensing amount of each of the pixel sensing groups. The coordinate calculation method according to claim 5, wherein the normalization program multiplies the third capacitance sensing amount of each pixel sensing group by the proportional value according to a preset proportional value corresponding to each pixel sensing group. The coordinate calculation method according to claim 6, wherein the preset proportional value corresponding to each pixel sensing group is obtained by: touching the pixel sensing group and the one sensing unit respectively by the touch object; Obtaining a third capacitive sensing amount of each of the pixel sensing groups and a first capacitive sensing amount of the sensing unit; and respectively taking a ratio of a first capacitive sensing amount of the sensing unit to a third capacitive sensing amount of each of the pixel sensing groups , so that the ratio is a preset proportional value corresponding to the pixel sensing group. A touch device with fingerprint identification includes: A touch body includes a plurality of sensing units and a touch sensing circuit, the touch sensing circuit electrically connects the plurality of sensing units, and has a standard operation program built therein; and a fingerprint identifier includes a plurality of fingerprint identifiers a pixel electrode and a readout circuit; the readout circuit is electrically connected to the plurality of pixel electrodes and the touch sensing circuit, and the touch body and the fingerprint recognizer together form a touch detection area; the touch sensing The circuit performs the coordinate operation program, comprising the steps of: (a) reading a plurality of first capacitive sensing quantities of the plurality of sensing units of the touch body via the touch sensing circuit, and reading the same through the readout circuit a plurality of second capacitive sensing quantities of the plurality of pixel electrodes; (b) dividing the plurality of pixel electrodes into a plurality of pixel sensing groups via the touch sensing circuit, and obtaining a plurality of third corresponding to the plurality of pixel sensing groups a capacitance sensing quantity, wherein each of the pixel sensing groups includes at least two pixel electrodes, and each of the third capacitance sensing amounts is generated by the at least two images in the pixel sensing group A second capacitive sensing electrode, the amount of computation obtained; and (c) for calculating the coordinates of the touch object based on the plurality of first sensing capacitor and the amount of the plurality of third capacitive sensing amount. The touch sensing device of claim 8, the touch sensing circuit further comprising: a receiving unit electrically connected to the plurality of sensing units to receive the plurality of first capacitive sensing of the plurality of sensing units And a main controller electrically connected to the receiving unit, wherein the plurality of first capacitive sensing quantities of the plurality of sensing units of the touch body are respectively read by the receiving unit (a), and The main controller is electrically connected to the readout circuit, and the plurality of second capacitive sensing amounts of the plurality of pixel electrodes of the fingerprint identifier are respectively read in the step (a) through the readout circuit; The controller further performs steps (b) and (c). The touch sensing device of claim 8, the touch sensing circuit further comprising: a receiving unit electrically connected to the plurality of sensing units to receive the plurality of first capacitive sensing amounts of the plurality of sensing units a signal processing unit electrically connected to the readout circuit for performing a plurality of second capacitive sensing amounts and steps of reading a plurality of pixel electrodes of the fingerprint identifier in the step (a) through the readout circuit (b); and a main controller electrically connected to the receiving unit, wherein the plurality of first capacitive sensing quantities of the plurality of sensing units of the touch body are respectively read in the step (a) through the receiving unit And the main controller is electrically connected to the signal processing unit to obtain the third capacitive sensing amount of each of the pixel sensing groups through the signal processing unit; and the main controller further performs step (c). The touch device of claim 8, wherein the touch detection area includes a first area and a second area; the touch system further includes a circuit board and a first protection layer, the plurality The sensing unit is disposed on the circuit board and covered by the first protection layer; and the fingerprint identifier further comprises a substrate, a chip disposed on the substrate, and a second protection The plurality of pixel electrodes are disposed on the wafer corresponding to the second region, and are covered by the second protective layer, and the surfaces of the first and second protective layers are flush. The touch device of claim 11, wherein the circuit board and the substrate are integrated into a single circuit board. The touch device of claim 8, wherein the touch detection area includes a first area and a second area; the touch system further includes a circuit board and a first protection layer, the plurality The sensing unit is disposed on the circuit board corresponding to the first area and covered by the first protective layer; and The fingerprint identifier further includes a substrate, a wafer disposed on the substrate, and a second protective layer disposed on the circuit board corresponding to the second region, the plurality of pixel electrodes corresponding to the second The surface is disposed on the wafer and covered by the second protective layer, and surfaces of the first and second protective layers are flush.