TW201800920A - Capacitive detecting device and driving method - Google Patents

Abstract

This invention relate to a capacitive sensing device and driving method thereof. The capacitive sensing device includes a scanning line, a data reading line, a common potential line, a sensing unit, scanning driving circuit and a processing circuit. The sensing unit is providing a scanning pulse to the scanning line. During the enabling of scanning pulse, the processing circuit is providing a first driving pulse to the data reading line and providing a second riving pulse to the common potential line. Each the enabling of first riving pulse and each the enabling of second riving pulse both less than the enabling of scanning pulse. The first riving pulse's and second riving pulse's enabling is same with time and voltage.

Description

Capacitive detecting device and driving method

The invention relates to a capacitive detecting device and a driving method, in particular to a capacitive detecting device and a driving method capable of avoiding parasitic capacitance interference.

In the conventional fingerprint reading device, the fingerprint of the triggered fingerprint is read by the sensing metal, and the fingerprint is recognized by the processing circuit. As shown in FIG. 16, it is a processing circuit of the conventional fingerprint reading device.

However, between the conventional pixel circuit and the sensing end, since it is difficult to achieve a complete uniform distribution during the manufacturing process, due to the uneven distribution, parasitic capacitance will be generated, and the conventional method is in each pixel circuit. In addition, a set of processing circuits is set, but this will cause the circuit to be too complicated and the circuit area will be difficult to reduce.

Therefore, how to provide an effect that can effectively avoid parasitic capacitance, while simplifying the circuit design and reducing the circuit area, will be the focus and focus of this case.

An object of the present invention is to provide a driving method of a capacitive detecting device which can effectively avoid the influence of parasitic capacitance.

Another object of the present invention is to provide a capacitive sensing device that simplifies circuit design and reduces circuit area.

A capacitive sensing device of the present invention includes a scan line, a data read line, a common potential line, a sensing unit, a scan driving circuit and a processing circuit, and the circuit sensing unit is electrically coupled to scan The line, the data read line and the common potential line, the scan drive circuit is electrically coupled to the scan line for providing a scan line and a scan pulse, and the processing circuit is electrically coupled with the data read line and the common potential line for Providing at least one first driving pulse of the data reading line during the enabling period of the scan pulse, and providing at least one second driving pulse of the common potential line during the enabling period of the scan pulse, and the enabling period of each first driving pulse The enabling period with each of the second driving pulses is less than the enabling period of the scan pulse, and the enabling time and the voltage magnitude of the first driving pulse and the second driving pulse are the same.

A capacitive detecting device of the present invention comprises a plurality of scanning lines, a plurality of data reading lines, a plurality of common potential lines, a plurality of sensing units, a scanning driving circuit and a processing circuit, and each sensing unit is electrically One of the ones of the scan lines, one of the data read lines and one of the common potential lines, the scan drive circuit is electrically coupled to the scan lines, and is configured to sequentially provide a plurality of scan pulses to the scan lines. The processing circuit is electrically coupled to the data read line and the common potential line, and is configured to provide at least one first drive pulse for each data read line during the enable period of each scan pulse, and at each scan pulse Providing at least one second driving pulse corresponding to the common potential line in one of the common potential lines during the enabling period, the enabling period of each of the first driving pulses and the enabling period of each of the second driving pulses are less than each scanning pulse During the enable period, the first drive pulse and the second drive pulse corresponding to the same scan pulse have the same enable time and voltage magnitude.

A driving method of a capacitive detecting device according to the present invention, the driving method comprising: providing a scan line-scan pulse; providing at least one first drive pulse of the data read line during the enable period of the scan pulse; and enabling the scan pulse Providing at least one second driving pulse of the common potential line, wherein the enabling period of each first driving pulse and the enabling period of each second driving pulse are less than an enabling period of the scanning pulse, and the first driving pulse is The enabling time and voltage of the second driving pulse are the same.

A driving method of a capacitive detecting device according to the present invention includes sequentially providing a plurality of scan pulses to a scan line; and providing at least one first drive pulse for each data read line during an enable period of each scan pulse; Providing at least one second drive pulse corresponding to the common potential line in one of the common potential lines during the enable period of each scan pulse, wherein the enable period of each first drive pulse and the enable period of each second drive pulse All are smaller than the enable period of each scan pulse, and the enable time and voltage magnitude of the first drive pulse and the second drive pulse corresponding to the same scan pulse are the same.

A capacitive sensing device of the present invention includes a scan line, a data read line, a common potential line, a sensing unit, a scan drive circuit, and a processing circuit. The common potential line is electrically coupled to a preset. The potential sensing unit is electrically coupled to the scan line, the data read line and the common potential line, and the scan drive circuit is electrically coupled to the scan line for providing a scan line and a scan pulse, and the processing circuit is electrically coupled to the data. a read line and a common potential line for providing at least one drive pulse of the common potential line during the enable period of the scan pulse, and the enable period of each drive pulse is less than the enable period of the scan pulse, and the processing circuit includes an amplifier a first switch, a second switch and a capacitor, the amplifier has a first end, a second end and an output end, the second end is electrically coupled to the common potential line, and the first switch has a third end and a fourth end, the third end is electrically coupled to the common potential line, the fourth end is electrically coupled to the data reading line, the second switch has a fifth end and a sixth end, and the fifth end is electrically coupled to the data Reading line, sixth end electrical To the first terminal, a capacitor having a seventh terminal and an eighth terminal, the seventh terminal is electrically coupled to the first terminal, the eighth terminal is electrically coupled to the output terminal.

A capacitance detecting device of the present invention includes a plurality of scanning lines, a plurality of data reading lines, a plurality of common potential lines, a plurality of sensing units, a scanning driving circuit and a plurality of processing circuits, and the common potential lines Electrically coupled to a predetermined potential, each sensing unit is electrically coupled to one of the scan lines, one of the data read lines and one of the common potential lines, and the scan drive circuit is electrically The scan line is coupled to the scan line, and is configured to sequentially provide a plurality of scan pulses to the scan line. Each processing circuit is electrically coupled to at least one of the data read line and at least one of the common potential lines. And providing at least one driving pulse corresponding to the common potential line in one of the common potential lines during the enabling period of each scan pulse, the enabling period of each driving pulse is less than the enabling period of each scanning pulse, each The processing circuit includes an amplifier, a first switch, a second switch, and a capacitor. The amplifier has a first end, a second end, and an output. The second end is electrically coupled to the common potential line. Switch has one The third end is electrically coupled to the common potential line, the fourth end is electrically coupled to the data reading line, and the second switch has a fifth end and a sixth end. The fifth end is electrically coupled to the data reading line, the sixth end is electrically coupled to the first end, the capacitor has a seventh end and an eighth end, and the seventh end is electrically coupled to the first end The eighth end is electrically coupled to the output end.

In the capacitive detecting device and the driving method of the present invention, since each scanning line and the common potential line are freely controllable, the fingerprint capacitance can be read through the conduction of the scanning line and the common potential line, thereby effectively avoiding parasitic The effect of the capacitor, and the circuit is simple, the overall area of the circuit is reduced, and all of the above purposes are achieved.

1 and FIG. 2, FIG. 1 is a structural diagram of a touch device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of the sensing unit 11. The touch device 100 includes scan lines G1 G Gm, data read lines D1 D Dm, a common potential line Vcom, a scan drive circuit 10 , a sensing unit 11 , and a processing circuit 12 . The sensing units 11 arranged in a matrix are electrically coupled to the scanning lines G1 G Gm, the data reading lines D1 D Dm and the common potential line Vcom, respectively. The scan driving circuit 10 is electrically coupled to the scan lines G1 G Gm, and the scan driving circuit 10 is configured to provide scan lines G1 G Gm scan pulses. The processing circuit 12 is electrically coupled to the data reading lines D1 DDm and the common potential line Vcom. The sensing unit 11 includes a transistor T1 and a storage capacitor Cst. The transistor T1 has a first end, a second end, and a control end. The control end is electrically coupled to the scan line, and the first end is electrically coupled to the data line. One end of the storage capacitor Cst is electrically coupled to the second end, and the other end is electrically coupled to the common potential line.

FIG. 3 is a timing diagram of signals of the sensing unit 11 of FIG. 2. Referring to FIG. 1 to FIG. 3 together, the processing circuit 12 is configured to provide at least one first driving pulse of the data reading lines D1 D Dm during the enabling period of the scanning pulses of the scanning lines G1 G Gm, and on the scanning lines G1 G Gm The common potential line Vcom is provided with at least one second driving pulse during the enabling period of the scan pulse, and the enabling period of each first driving pulse and the enabling period of each second driving pulse are less than the enabling period of the scanning pulse And the first driving pulse and the second driving pulse have the same enabling time and voltage magnitude.

For example, as shown in FIG. 3A, the processing circuit 12 is configured to provide the first read pulse P11 of the data read line Dm during the enable period of the scan pulse P10 of the scan line Gm, and the scan pulse P10 of the scan line Gm. The common potential line Vcom second driving pulse P21 is provided during the enabling period, and the enabling period of the first driving pulse P11 and the enabling period of the second driving pulse P21 are both smaller than the enabling period of the scanning pulse P10, and the first driving pulse The enabling time and voltage magnitude of P11 and the second driving pulse P21 are the same. The two ends of the storage capacitor Cst in the sensing unit 11 respectively apply the same time and the same magnitude of voltage through the first driving pulse P11 and the second driving pulse P21, so that the sensing unit 11 of the touch device 100 is used. Whether the structure or size of the storage capacitor Cst used in the process is the same, and the two ends of the storage capacitor Cst of each sensing unit 11 are equipotential, so as to avoid voltage variation caused by the process, thereby reducing noise interference. To make the detection results more accurate.

In addition, after the touch device 100 is in the enable period of the scan pulse of each of the scan lines G1 G Gm, and after the enable period of each first drive pulse ends, the processing circuit 12 reads through the data read lines D1 D Dm. The sensing data of the sensing unit 11 is used to detect whether a fingerprint contact event occurs, and a fingerprint pattern is obtained according to the data frame constructed by the sensing data. Specifically, as shown in FIG. 3A, after the first driving pulse P11 is supplied to the data read line Dm and the second drive pulse P21 to the common potential line Vcom, in the period t11, if the corresponding sensing unit 11 is not When touched, the sensing data is detected when the two ends of the storage capacitor Cst are equipotential, wherein the two ends of the storage capacitor Cst are nearly equal to zero current. On the other hand, if the corresponding sensing unit 11 is touched by the finger, the contact position responds to a sensing capacitance via the grounding of the human body, so that the sensing data of the detected sensing unit 11 will be a potential that is not significantly equal to zero. Determine the occurrence of a fingerprint contact event. Thereby, the touch device 100 detects whether a fingerprint contact event occurs, and obtains a fingerprint pattern according to the data screen constructed by the sensing data.

Furthermore, during the enable period of the scan pulses of the scan lines G1 G Gm, the processing circuit 12 can provide one or more first drive pulses for the data read lines D1 D Dm, and provide a common potential line Vcom corresponding to each of the first A second drive pulse of a drive pulse. As shown in FIG. 3B, in the enable period of the scan pulse P10 of the scan line Gm, after the first drive pulse P12 to the data read line Dm and the second drive pulse P22 to the common potential line Vcom are supplied, the data read line Dm reads the sensing data of the sensing unit 11 in the period t12, and the processing circuit 12 can perform another detection to provide the first driving pulse P13 to the data reading line Dm and the second driving pulse P23 to the common potential. The line Vcom, and the data reading line Dm reads the sensing data of the sensing unit 11 in the period t13. The processing circuit 12 can increase the accuracy by detecting the multiple times of the data reading line Dm during the enabling period of the scanning pulse of the scanning line Gm, and has more sensing data to construct a data picture to obtain a fingerprint pattern. However, the present invention is not limited thereto, and the number of times of detecting through the data read line during the enable period of the scan pulse can be adjusted according to the actual implementation.

Further, FIG. 4 is a schematic diagram of a fingerprint contact event of the sensing unit 11 of the present invention. Referring to FIG. 1 and FIG. 4 , when the sensing unit 11 in the touch device 100 is touched by a finger, the surface of the finger and the glass cover plate applied to the glass cover corresponding to the sensing unit 11 may be formed. The sensing capacitor Cf is in response to the sensing capacitor Cf, and one end of the sensing capacitor Cf is coupled to the second end of the sensing unit 11, and the other end is grounded. The finger-based fingerprint pattern is a peak having a peak and a trough, and the charge value charged by the peak capacitance of the fingerprint is greater than the charge value of the sensing capacitor Cf of the valley response of the fingerprint. Therefore, when the processing circuit 12 reads the sensing data of the sensing unit 11 of each corresponding fingerprint contact event, one or more fingerprint patterns can be constructed according to the different different charging values. In the embodiment of the present invention, since the touch device 100 has a resolution of at least 200 dpi to 508 dpi, and preferably has a resolution of 508 dpi, there is sufficient sensing data to facilitate constructing a fingerprint pattern.

The manner in which the touch device 100 detects whether a fingerprint contact event occurs may be sequentially providing a plurality of scan pulses to the scan lines G1 G Gm, and each data read line D1 is provided during the enable period of each scan pulse. ~Dm at least one first driving pulse, providing one of the common potential lines Vcom corresponding to the at least one second driving pulse in the enabling period of each scanning pulse, and the processing circuit 12 by the sensed sensing Whether the sensing data of the unit 11 is a potential that is not significantly equal to zero, and whether a fingerprint contact event occurs is determined.

Alternatively, the scan driving circuit 10 divides the scan lines G1 to Gm into a plurality of groups and respectively supplies a plurality of scan pulses to the group. That is to say, the scan driving circuit 10 can supply a scan pulse only to a part of the scan lines, and quickly judge whether or not a fingerprint contact event occurs. The manner of dividing the scan lines G1 G Gm into a plurality of groups may be adjusted according to actual implementation requirements. Moreover, after detecting the fingerprint contact event, the scanning may be expanded according to the corresponding range, and the processing circuit 12 reads the sensing data of the sensing unit 11 of each corresponding fingerprint contact event to construct the fingerprint pattern.

FIG. 5 is a schematic diagram of a configuration of a multiplexer of a touch device according to an embodiment of the present invention. The touch device 200 further includes a plurality of multiplexers 21 or/and multiplexers 22, by multiplexer 21/ The application of 22 can reduce the signal input line connecting the circuit control chip to the plurality of scan lines and the plurality of data lines. In addition, the driving method, the fingerprint detecting event, and the fingerprinting pattern of the touch device 200 of the present embodiment are the same as those of the touch device 100, and thus are not described herein.

Referring to FIG. 5, the multiplexer 21 is electrically coupled between the scan driving circuit 10 and the scan lines G1 GGm. Each multiplexer has n input terminals and m output terminals, and n and m are positive integers. The input of the multiplexer 21 is electrically coupled to the scan lines G1 G Gm. In one embodiment, the multiplexer 22 is electrically coupled between the processing circuit 12 and the data read lines D1 to Dm. The multiplexer 22 has n input terminals and m output terminals, and both n and m are positive. An integer and n is less than m, and the input end of the multiplexer 22 is for receiving the first driving pulse provided by the processing circuit 12, and the output of the multiplexer 22 is electrically coupled to the data reading lines D1 to Dm.

Referring to FIG. 5 and FIG. 6A together, in an embodiment, during the enable period of the scan pulse of the scan line G1, the processing circuit 12 sequentially transmits the first drive pulse to the data read line D1 through the multiplexer 22. ~Dm, and after the end of the enabling period of the first driving pulse of each of the data reading lines D1 to Dm, the processing circuit 12 reads the sensing data of the sensing unit 11 through the same data reading line. Thereby, the processing circuit 12 sequentially receives the sensing data, detects whether a fingerprint contact event occurs, and constructs a fingerprint pattern according to the sensing data.

Referring to FIG. 5 and FIG. 6B together, in an embodiment, by dividing the data read line into a plurality of groups, and the respective groups are enabled in the enable period of the scan pulse of each scan line. The first drive pulse is transmitted sequentially. In detail, during the enable period of the scan pulse of the scan line G1, the processing circuit 12 simultaneously transmits the first drive pulse to the data read lines D1 to D (m/n) through the multiplexer 22, and reads the data. After the end of the enable period of the first drive pulse of the line D1 to D (m/n), the data read lines D1 to D (m/n) simultaneously read the sensed data of the sensing unit 11. Then, the multiplexer 22 simultaneously transmits the first driving pulse to the data reading line D(m/n+1)~D(m*2/n), and at the data reading line D(m/n+1) After the end of the enable period of the first drive pulse of ~D(m*2/n), the data read line D(m/n+1)~D(m*2/n) simultaneously reads the sensing unit 11 Sensing data. Therefore, it can be known that the first driving pulse is sequentially transmitted to the plurality of groups of the data reading lines during the enabling period of the scanning pulse of each scanning line to read the sensing data of the sensing unit. No longer.

In the foregoing embodiment, the sensing units of each column are coupled to the same common potential line. However, the invention is not limited. In some examples, the sensing cells of each column can be coupled to different common potential lines. As long as the sensing unit of each column can receive the same time and the same magnitude of voltage at both ends of the storage capacitor during the enabling of the scan pulse, the two ends of the storage capacitor of each sensing unit can be equipotential. In order to avoid the voltage variation caused by the process, the noise interference can be reduced, and the detection result is more accurate.

FIG. 7 is a structural diagram of a touch device according to another embodiment of the present invention. The operating principles of the touch device are the same as those of the touch device, and are not described here. The difference is that the touch device of this embodiment also uses a scan line in combination with a part of the sensing unit. By sharing the scanning lines by the sensing units of two consecutive columns, the number of wirings can be reduced and the cost can be reduced. In addition, in the touch device of this embodiment, the sensing units of each column are coupled to different common potential lines.

FIG. 8 is a timing diagram showing main signals of the touch device of FIG. 7. Referring to FIG. 7 and FIG. 8 together, the sensing units of the two consecutive columns of the scanning line G1 are respectively coupled to different common potential lines VC1 and common potential lines VC2, and the sense of two consecutive columns of scanning lines G2 is used in common. The measuring units are respectively coupled to different common potential lines VC3 and common potential lines VC4. For example, in the enable period of the scan pulse of the scan line G1, the data read line D1 and the read line D3 coupled to the sensing units of two consecutive columns have the same time and the same size as the common potential line VC1. The voltage, the data reading line D2 and the reading line D4 have the same time and the same magnitude of voltage as the common potential line VC2, so that the two ends of the storage capacitor of each sensing unit are equipotential, thereby reducing noise interference and The effect of making the results of the detection more accurate. The common potential line VC1 and the common potential line VC2 may be the same or different. Therefore, similarly, the operation of the scanning line G2, the common potential line VC3, and the common potential line VC4 will not be described herein.

FIG. 9 is a structural diagram of a touch device according to still another embodiment of the present invention. FIG. 9 is similar to the touch device shown in FIG. 7, and a part of the sensing unit can share one scanning line. 9 is different from FIG. 7 in that a part of the sensing units can also share a common potential line.

FIG. 10 is a timing diagram showing main signals of the touch device of FIG. 9. Referring to FIG. 9 and FIG. 10 together, the sensing units of the two consecutive columns using the scanning line G1 are respectively coupled to different common potential lines VC1 and common potential lines VC2, and the sense of two consecutive columns of scanning lines G2 is used in common. The measuring units are respectively coupled to different common potential lines VC2 and common potential lines VC3. During the enable period of the scan pulse of the scan line G1, the data read line D1 and the read line D3 coupled to the sensing units of the two consecutive columns and the common potential line VC1 are voltages having the same time and the same magnitude, data. The read line D2 and the read line D4 are voltages having the same time and the same magnitude as the common potential line VC2. In addition, in the enable period of the scan pulse of the scan line G2, the data read line D1 and the read line D3 coupled to the sensing units of the two consecutive columns have the same time and the same as the common potential line VC2. The voltage of the magnitude, the data reading line D2 and the reading line D4 are voltages having the same time and the same magnitude as the common potential line VC3. The common potential line VC1, the common potential line VC2, and the common potential line VC3 may be the same or different. Based on the above, it can be known that some of the sensing units in the touch device can share the scanning lines and share the common potential line, which not only reduces the noise interference but also makes the detection result more accurate, and can increase the sensing. Area, reduced wiring and increased aperture ratio, as well as reduced costs.

A capacitive detecting device according to an embodiment of the present invention, as shown in FIG. 11, includes a plurality of scanning lines 1, a plurality of data reading lines 2, a plurality of common potential lines (Vcom) 3, and a plurality of sensing units. 4, a scan driving circuit 6 and a processing circuit 5, each sensing unit 4 is electrically coupled to each scan line 1, each data read line and each common potential line 3, the scan drive circuit is electrically coupled Each scan line 1 is used to sequentially supply a plurality of scan pulses to each scan line 1. The processing circuit 5 is electrically coupled to each of the data read lines 2 and the common potential lines 3, and is used for each scan pulse. Providing at least one first driving pulse for each data reading line 2 during the enabling period, and providing at least one second driving pulse for the corresponding common potential line 3 in each common potential line 3 during the enabling period of each scanning pulse, The enabling period of a first driving pulse and the enabling period of each second driving pulse are both less than an enabling period of each scanning pulse, and the enabling of the first driving pulse and the second driving pulse corresponding to the same scanning pulse The time and voltage are the same.

Each of the sensing units includes a transistor 41 and a storage capacitor 42. The transistor 41 has a first end 411, a second end 412, and a control end 410. The control end 410 is electrically coupled to the corresponding end. Each of the scan lines 1 is electrically coupled to the corresponding data read line 2, and one end of the storage capacitor 42 is electrically coupled to the second end 412, and the other end is electrically coupled to the corresponding common potential line. 6. The processing circuit 5 includes an amplifier 50, a first switch 51, a second switch 52, and a capacitor 53. The amplifier 50 has a first end 501, a second end 502, and an output end 500. The second end 502 is electrically The first switch 51 has a third end 513 and a fourth end 514. The third end 513 is electrically coupled to the common potential line 3, and the fourth end 514 is electrically coupled to the data reading line. The second switch 52 has a fifth end 525 and a sixth end 526. The fifth end 525 is electrically coupled to the data reading line 2. The sixth end is electrically coupled to the first end 501, and a capacitor 53 has a The seventh end 539 is electrically coupled to the first end 501 , and the eighth end 538 is electrically coupled to the output end 500 . When the first switch is turned on 51, the second switch 52 is non-conductive, and the processing circuit 5 provides the voltage value (V _X ) of the preset potential (VSX) to the common potential line 3 during the second switch 52 being turned on. In this example, the preset potential is coupled to the common potential line 3 through a buffer 7.

Referring to FIG. 12, a flow chart of the driving method of the capacitive detecting device of the present embodiment is as follows. First, as step 301, a scan pulse of each scan line 1 is provided, and in step 302, a scan pulse is generated. During the energy period, at least one first driving pulse is provided for each data reading line 2, and then, as step 303, at least one second driving pulse of each common potential line 3 is provided during the enabling period of the scanning pulse, wherein each first driving The enable period of the pulse and the enable period of each of the second drive pulses are less than the enable period of the scan pulse, and the enable time and the voltage magnitude of the first drive pulse and the second drive pulse are the same. In this example, a plurality of scan lines 2 are taken as an example. Therefore, the scan lines 2 can be divided into a plurality of groups, and a plurality of scan pulses can be respectively provided to corresponding groups.

In the structure of the thin film transistor TFT, each scan line and the common potential line are freely controllable, and the fingerprint capacitance can be read through the conduction of the scan line and the common potential line, as shown in FIG. When the control signal phi1=1, Vp is the voltage of Vcom+Vcm. When the control signal phi2=1, if Vsx changes, Vout will reflect the C _F value (sensing capacitance), assuming the integrator is When the overflow (Cint) has been reset (reset), each time Phi1, Phi2, and Vout will change gradually, the amount of change is proportional to C _F , and the obtained capacitance is the fingerprint capacitance, due to the parasitic capacitance The terminal is always connected to Vcom, so the capacitive sensing device is not disturbed by parasitic capacitance.

The multiplexer 81 is electrically coupled between the scan driving circuit 6 and the scan line 1 as shown in FIG. The multiplexer 82 is electrically coupled between the scan driving circuit 5 and the data reading line 2. Each of the multiplexers 81 and 82 has n input terminals and m output terminals, n and m. A positive integer and n is less than m, and any input end 811 of the multiplexer 81 is used to receive each scan pulse. Any output 812 of the multiplexer 81 is electrically coupled to each scan line 1, and the multiplexer 82 Any of the input terminals 821 is configured to receive each of the first driving pulses, and any one of the output ends 822 of the multiplexer 82 is electrically coupled to each of the data reading lines 2.

A capacitive detecting device according to another embodiment of the present invention is shown in FIG. 15. In this example, a plurality of processing circuits 5 are taken as an example, and each processing circuit 5 is electrically coupled to each data reading. Taking the line 2 and the common potential line 3, the transistor 41 has a ninth end 419, a tenth end 410 and a control end 400, and one of the processing circuits 5 provides a corresponding common potential line 3 in the common potential line 3. During the period of at least one driving pulse, a parasitic capacitance is formed in parallel with the storage capacitor 42. When a fingerprint contact event occurs, a sensing capacitor 43 is formed, wherein one end of the sensing capacitor 43 is coupled to the tenth end 410 and the other end is coupled to Ground potential.

In the capacitive detecting device and the driving method of the present invention, since each scanning line and the common potential line are freely controllable, the fingerprint capacitance can be read through the conduction of the scanning line and the common potential line, and the parasitic capacitance is obtained. The two ends are always connected to Vcom, so the capacitive detection device is not affected by parasitic capacitance, which not only effectively avoids the influence of parasitic capacitance, but also makes the circuit relatively simple, and the overall area of the circuit is reduced, and all of the above objectives are achieved.

While the invention has been described above by way of a preferred embodiment, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

100,200‧‧‧ touch devices
20‧‧‧ touch area
21, 22‧‧‧ multiplexers
Cst‧‧‧ storage capacitor
Cf, C _F , 43‧‧‧ induction capacitor
G1~Gm‧‧‧ scan line
D1~Dm‧‧‧ data reading line
D1~D(m/n), D(m/n +1)~D(m*2/n), D[m*(n-1)/n +1)~Dm‧‧‧ data reading line
P10, P11, P21, P12, P22, P13, P23‧‧ pulses
During t11, t12, t13‧‧
1‧‧‧ scan line
2‧‧‧data reading line
3, Vcom, V _C1 , V _C2 , V _C3 , V _C4 ‧ ‧ common potential line
4, 11‧‧‧ Sensing unit
6, 10‧‧‧ scan drive circuit
5, 12‧‧‧ processing circuit
41, T1‧‧‧ transistor
42‧‧‧ Storage Capacitor
411‧‧‧ The first end of the storage capacitor
412‧‧‧Second end of storage capacitor
410‧‧‧Control terminal
50‧‧‧Amplifier
51‧‧‧First switch
52‧‧‧second switch
53‧‧‧ Capacitance
501‧‧‧ first end of the amplifier
502‧‧‧ second end of the amplifier
500‧‧‧Amplifier output
513‧‧‧The third end of the first switch
514‧‧‧fourth end of the first switch
525‧‧‧ fifth end of the second switch
526‧‧‧ sixth end of the second switch
539‧‧‧ seventh end of the capacitor
538‧‧‧The eighth end of the capacitor
7‧‧‧Relief
81, 82‧‧‧Multiplexer
811, 821‧‧‧ input
812, 822‧‧‧ output
419‧‧‧ ninth end of the transistor
410‧‧‧The tenth end of the transistor
400‧‧‧Control end of the transistor
Phi1, Phi2‧‧‧ control signals
V _X ‧‧‧ voltage value
Vcom‧‧‧Common potential line

FIG. 1 is a block diagram of a touch device according to an embodiment of the invention. 2 is a circuit diagram of a sensing unit in accordance with an embodiment of the present invention. FIG. 3A is a timing diagram of signals of the sensing unit of FIG. 2. FIG. FIG. 3B is a timing diagram of another signal of the sensing unit of FIG. 2. FIG. 4 is a schematic view of a sensing unit of the present invention when a fingerprint contact event occurs. FIG. 5 is a schematic diagram showing the configuration of a multiplexer of a touch device according to an embodiment of the invention. FIG. 6A is a timing diagram of driving signals of the touch device of FIG. 5. FIG. FIG. 6B is a timing diagram of another driving signal of the touch device of FIG. 5. FIG. 7 is a structural diagram of a touch device according to another embodiment of the present invention. FIG. 8 is a timing diagram of main signals of the touch device of FIG. 7. FIG. 9 is a structural diagram of a touch device according to still another embodiment of the present invention. FIG. 10 is a timing diagram of main signals of the touch device of FIG. 9. 11 is a circuit diagram of a capacitive detecting device according to still another embodiment of the present invention; FIG. 12 is a flow chart of the capacitive detecting device of FIG. 11; FIG. 13 is a clock diagram of the capacitive detecting device of FIG. 14 is a circuit diagram of a multiplexer of the capacitive detecting device of FIG. 11; FIG. 15 is a circuit diagram of a capacitive detecting device according to another embodiment of the present invention; and FIG. 16 is a circuit diagram of a conventional fingerprint reading device. ;

1‧‧‧ scan line

2‧‧‧data reading line

3‧‧‧Common potential line

4‧‧‧Sensor unit

6‧‧‧Scan drive circuit

5‧‧‧Processing circuit

41‧‧‧Optoelectronics

42‧‧‧ Storage Capacitor

411‧‧‧ The first end of the storage capacitor

412‧‧‧Second end of storage capacitor

410‧‧‧Control terminal

50‧‧‧Amplifier

51‧‧‧First switch

52‧‧‧second switch

53‧‧‧ Capacitance

501‧‧‧ first end of the amplifier

502‧‧‧ second end of the amplifier

500‧‧‧Amplifier output

513‧‧‧The third end of the first switch

514‧‧‧fourth end of the first switch

525‧‧‧ fifth end of the second switch

526‧‧‧ sixth end of the second switch

53‧‧‧ Capacitance

539‧‧‧ seventh end of the capacitor

538‧‧‧The eighth end of the capacitor

7‧‧‧Relief

C _F ‧‧‧Induction Capacitance

Phi1, Phi2‧‧‧ control signals

Claims (17)

A capacitive detecting device includes: a scan line; a data read line; a common potential line; a sensing unit electrically coupled to the scan line, the data read line and the common potential line; a driving circuit electrically coupled to the scan line for providing a scan pulse of the scan line; and a processing circuit electrically coupled to the data read line and the common potential line for enabling the scan pulse Providing at least one first driving pulse of the data reading line during the period, and providing at least one second driving pulse of the common potential line during the enabling period of the scanning pulse, and each enabling period of each first driving pulse The enabling period of a second driving pulse is less than the enabling period of the scan pulse, and the enabling time and the voltage magnitude of the first driving pulse and the second driving pulse are the same. The capacitive sensing device of claim 1, wherein the sensing unit comprises: a transistor having a first end, a second end, and a control end, the control end electrically coupled to the a scan line, the first end is electrically coupled to the data read line, and a storage capacitor is electrically coupled to the second end and electrically coupled to the common potential line. A capacitive detecting device includes: a plurality of scanning lines; a plurality of data reading lines; a plurality of common potential lines; a plurality of sensing units, each of the sensing units being electrically coupled to one of the scanning lines One of the data reading lines and one of the common potential lines; a scan driving circuit electrically coupled to the scan lines, and configured to sequentially provide a plurality of scan pulses to the scan lines And a processing circuit electrically coupled to the data read lines and the common potential lines, and configured to provide at least one first drive pulse for each data read line during an enable period of each scan pulse, and Providing at least one second driving pulse corresponding to the common potential line of one of the common potential lines during the enabling period of each scan pulse, the enabling period of each first driving pulse and the enabling of each second driving pulse The period is less than the enable period of each scan pulse, and the first drive pulse and the second drive pulse corresponding to the same scan pulse have the same enable time and voltage magnitude. The capacitive sensing device of claim 3, wherein each sensing unit comprises: a transistor having a first end, a second end, and a control end, the control end being electrically coupled One of the scan lines, the first end is electrically coupled to one of the data read lines; and a storage capacitor is electrically coupled to the second end at one end and electrically coupled to the other end Connect one of the common potential lines. The capacitive detecting device of claim 3, further comprising a plurality of multiplexers electrically coupled between the scan driving circuit and the scan lines, each of which is The device has n inputs and m outputs, n and m are both positive integers and n is less than m, and any input of each multiplexer is used to receive one of the scan pulses, and each Any one of the outputs of the multiplexer is electrically coupled to one of the scan lines. The capacitive detecting device of claim 3, further comprising a plurality of multiplexers electrically coupled between the processing circuit and the data reading lines, each The multiplexer has n inputs and m outputs, n and m are both positive integers and n is less than m, and any input of each multiplexer is used to receive one of the first driving pulses And any output of each multiplexer is electrically coupled to one of the data reading lines. A method for driving a capacitive detecting device, the capacitive detecting device comprising a scan line, a data read line, a common potential line and a sensing unit, the sensing unit is electrically coupled to the scan line, a data read line and the common potential line, the driving method comprising: providing the scan line-scan pulse; providing at least one first drive pulse of the data read line during an enable period of the scan pulse; and at the scan pulse Providing at least one second driving pulse of the common potential line, wherein an enabling period of each first driving pulse and an enabling period of each second driving pulse are less than an enabling period of the scanning pulse, and The first driving pulse and the second driving pulse have the same enabling time and voltage magnitude. A method for driving a capacitive detecting device, the capacitive detecting device comprising a plurality of scanning lines, a plurality of data reading lines, a plurality of common potential lines and a plurality of sensing units, each sensing unit being electrically coupled One of the scan lines, one of the data read lines and one of the common potential lines, the driving method includes: sequentially providing a plurality of scan pulses to the scan lines; Providing at least one first driving pulse for each data reading line during an enable period of a scan pulse; and providing at least one second of the common potential lines corresponding to one of the common potential lines during an enable period of each scan pulse a driving pulse, wherein an enabling period of each first driving pulse and an enabling period of each second driving pulse are less than an enabling period of each scanning pulse, and the first driving pulses corresponding to the same scanning pulse are The enabling times and voltage magnitudes of the second driving pulses are the same. The driving method of claim 8, further comprising dividing the scan lines into a plurality of groups and respectively providing a plurality of scan pulses to the groups. A capacitive detecting device includes: a scan line; a data read line; a common potential line electrically coupled to a predetermined potential; a sensing unit electrically coupled to the scan line, the data reading a scan line is electrically coupled to the scan line for providing a scan pulse of the scan line; and a processing circuit electrically coupled to the data read line and the common potential line, The processing circuit includes: an amplifier having one during at least one driving pulse of the common potential line during an enable period of the scan pulse, and an enable period of each of the driving pulses is less than an enable period of the scan pulse a first end, a second end, and an output end, the second end is electrically coupled to the common potential line; a first switch has a third end and a fourth end, the third end is electrically coupled The fourth potential is electrically coupled to the data reading line; the second switch has a fifth end and a sixth end, and the fifth end is electrically coupled to the data reading line. The sixth end is electrically coupled to the first end; and a capacitor is provided The seventh end is electrically coupled to the first end, and the eighth end is electrically coupled to the output end. The capacitive detecting device of claim 10, wherein when the first switch is turned on, the second switch is non-conductive, and the processing circuit causes the voltage of the preset potential during the second switch to be turned on. A value is supplied to the common potential line. The capacitive detecting device of claim 10, wherein the predetermined potential is coupled to the common potential line through a buffer. A capacitive detecting device comprises: a plurality of scanning lines; a plurality of data reading lines; a plurality of common potential lines electrically coupled to a predetermined potential; a plurality of sensing units, each sensing unit being electrically coupled One of the scan lines, one of the data read lines and one of the common potential lines; a scan driving circuit electrically coupled to the scan lines and sequentially provided a plurality of scan pulses to the scan lines; and a plurality of processing circuits, each of the processing circuits electrically coupled to at least one of the data read lines and at least one of the common potential lines and used to Providing at least one driving pulse corresponding to the common potential line in one of the common potential lines during the enabling period of each scan pulse, the enabling period of each driving pulse is less than the enabling period of each scanning pulse, and each processing circuit The first switch includes a first end, a second end, and an output end. The second end is electrically coupled to the common potential line. The first switch has a third end and a fourth end. The third end is electrically coupled to the common a bit line, the fourth end is electrically coupled to the data reading line; a second switch has a fifth end and a sixth end, the fifth end is electrically coupled to the data reading line, the sixth The first end is electrically coupled to the first end; and a capacitor has a seventh end and an eighth end. The seventh end is electrically coupled to the first end, and the eighth end is electrically coupled to the output end. The capacitive detecting device of claim 13, wherein each processing circuit provides a period of the corresponding common potential line of the at least one driving pulse in each of the common potential lines, when the first switch is turned on The second switch is non-conductive, and each processing circuit supplies the voltage value of the preset potential to the common potential line during the second switch being turned on. The capacitive detecting device of claim 14, wherein the processing circuit has an on-time of the first switch earlier than an on-time of the second switch during an enable period of each driving pulse. And after the end of the enable period of each driving pulse, the processing circuits read the plurality of sensing materials of the sensing units via the data reading lines. The capacitive sensing device of claim 13, wherein each sensing unit comprises: a transistor having a ninth end, a tenth end, and a control end, the control end being electrically coupled One of the scan lines, the ninth end is electrically coupled to one of the data read lines; and a storage capacitor, one end of which is electrically coupled to the tenth end, and the other end is electrically coupled Connecting one of the common potential lines; wherein, during the period in which the at least one processing circuit provides the at least one driving pulse of the corresponding common potential lines in the common potential lines, a parasitic capacitance is formed in parallel with the storage capacitor; When a fingerprint contact event occurs, a sensing capacitor is formed, wherein one end of the sensing capacitor is coupled to the tenth end and the other end is coupled to a ground potential. The capacitive detecting device of claim 13, wherein each processing circuit further comprises: a buffer, one end coupled to the predetermined potential, and the other end coupled to at least one of the common potential lines one.