TWI712935B - Capacitive sensing device and driving method thereof - 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 detection device and driving method

The invention relates to a capacitive detection device and a driving method, in particular to a capacitive detection device and a driving method that can avoid parasitic capacitance interference.

The conventional fingerprint reading device reads the triggered fingerprint through the sensing metal, and the fingerprint is recognized by the processing circuit. As shown in FIG. 16, it is the processing circuit of the conventional fingerprint reading device.

However, it is difficult to achieve a complete uniform distribution between the conventional pixel circuit and the sensing terminal during the manufacturing process, and parasitic capacitance will be generated due to the influence of uneven distribution. However, the previous practice is to install each pixel circuit Another set of processing circuits is set in the middle, but this will cause the circuit to be too complicated, and the circuit area will be difficult to reduce.

Therefore, how to provide a method that can effectively avoid the influence caused by the 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 detection device that can effectively avoid the influence caused by parasitic capacitance.

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

A capacitive detection 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. The circuit sensing unit is electrically coupled to the scan Line, data read line and common potential line. The scan drive circuit is electrically coupled to the scan line to provide a scan pulse for the scan line. The processing circuit is electrically coupled to the data read line and the common potential line for At least one first driving pulse for the data reading line is provided during the enabling period of the scan pulse, and at least one second driving pulse for the common potential line is provided during the enabling period of the scan pulse, and the enabling period of each first driving pulse The enabling period of each second driving pulse is less than the enabling period of the scan pulse, and the enabling time and voltage of the first driving pulse and the second driving pulse are the same.

A capacitive detection device of the present invention includes multiple scan lines, multiple data read lines, multiple common potential lines, multiple sensing units, a scan driving circuit, and a processing circuit. Each sensing unit is electrically The scan driving circuit is electrically coupled to one of the scan lines, one of the data reading lines, and one of the common potential lines, and the scan driving circuit is electrically coupled to the scan lines and used 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 used to provide each data read line with at least one first driving pulse during the enable period of each scan pulse, and at the end of each scan pulse In the enabling period, one of the common potential lines is provided corresponding to at least one second driving pulse of the common potential line, and the enabling period of each first driving pulse and the enabling period of each second driving pulse are both smaller than that of each scanning pulse During the enabling period, the first driving pulse and the second driving pulse corresponding to the same scan pulse have the same enabling time and voltage.

A driving method of a capacitive detection device of the present invention includes providing a scan line and a scan pulse; providing at least one first driving pulse for the data reading line during the enabling period of the scan pulse; and enabling the scan pulse During the period, at least one second driving pulse is provided for the common potential line, wherein the enabling period of each first driving pulse and the enabling period of each second driving pulse are both smaller than the enabling period of the scan pulse, and the first driving pulse and The enabling time and voltage of the second driving pulse are the same.

A driving method of a capacitive detection device of the present invention includes sequentially providing a plurality of scan pulses to the scan lines; providing at least one first driving pulse for each data read line during the enabling period of each scan pulse; and Provide one of the common potential lines corresponding to the common potential line at least one second driving pulse during the enabling period of each scan pulse, wherein the enabling period of each first driving pulse and the enabling period of each second driving pulse Both are less than the enabling period of each scan pulse, and the enabling time and voltage of the first driving pulse and the second driving pulse corresponding to the same scan pulse are the same.

A capacitive detection 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. The common potential line is electrically coupled to a preset Potential, the sensing unit is electrically coupled to the scan line, the data reading line and the common potential line. The scan driving circuit is electrically coupled to the scan line to provide a scan pulse from the scan line. The processing circuit is electrically coupled to the data The read line and the common potential line are used to provide the common potential line with at least one driving pulse during the enabling period of the scan pulse, and the enabling period of each driving pulse is less than the enabling period of the scan pulse. The processing circuit includes an amplifier , A first switch, a second switch and a capacitor, the amplifier has a first terminal, a second terminal and an output terminal, the second terminal is electrically coupled to the common potential line, the first switch has a third terminal and A fourth terminal, the third terminal is electrically coupled to the common potential line, the fourth terminal is electrically coupled to the data read line, the second switch has a fifth terminal and a sixth terminal, and the fifth terminal is electrically coupled to the data In the read line, the sixth terminal is electrically coupled to the first terminal, the capacitor has a seventh terminal and an eighth terminal, the seventh terminal is electrically coupled to the first terminal, and the eighth terminal is electrically coupled to the output terminal.

A capacitive detection device of the present invention includes multiple scanning lines, multiple data reading lines, multiple common potential lines, multiple sensing units, a scan driving circuit, and multiple processing circuits. Is electrically coupled to a predetermined potential, each sensing unit is electrically coupled to one of the scan lines, one of the data reading lines, and one of the common potential lines. The scan driving circuit is electrically Is electrically coupled to the scan line and used to sequentially provide a plurality of scan pulses to the scan line, and each processing circuit is electrically coupled to at least one of the data read line and at least one of the common potential line, And it is used to provide at least one driving pulse in one of the common potential lines corresponding to the common potential line during the enabling period of each scan pulse. The enabling period of each driving pulse is shorter than the enabling period of each scan pulse. The processing circuit includes an amplifier, a first switch, a second switch, and a capacitor. The amplifier has a first terminal, a second terminal, and an output terminal. The second terminal is electrically coupled to the common potential line. The switch has a third terminal and a fourth terminal. The third terminal is electrically coupled to the common potential line, the fourth terminal is electrically coupled to the data read line, and the second switch has a fifth terminal and a first terminal. Six terminals, the fifth terminal is electrically coupled to the data read line, the sixth terminal is electrically coupled to the first terminal, the capacitor has a seventh terminal and an eighth terminal, and the seventh terminal is electrically coupled The first terminal and the eighth terminal are electrically coupled to the output terminal.

In the capacitive detection device and driving method of the present invention, since each scan line and common potential line can be freely controlled, the fingerprint capacitance can be read through the conduction of the scan line and the common potential line to effectively avoid parasitic The influence caused by the capacitance, and the circuit is simple, the overall area of the circuit is reduced, and all the above objectives are achieved.

Please refer to FIGS. 1 and 2 together. 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: scanning lines G1 to Gm, data reading lines D1 to Dm, a common potential line Vcom, a scanning driving 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 to Gm, the data reading lines D1 to Dm, and the common potential line Vcom, respectively. The scan driving circuit 10 is electrically coupled to the scan lines G1 to Gm, and the scan driving circuit 10 is used to provide scan pulses for the scan lines G1 to Gm. The processing circuit 12 is electrically coupled to the data reading lines D1 to Dm 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 terminal, a second terminal, and a control terminal. The control terminal is electrically coupled to the scan line, and the first terminal 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 signal timing diagram of the sensing unit 11 in FIG. 2. 1 to 3, the processing circuit 12 is used to provide at least one first driving pulse for the data reading lines D1 to Dm during the enabling period of the scan pulses of the scan lines G1 to Gm, and to provide at least one first driving pulse on the scan lines G1 to Gm The common potential line Vcom is provided during the enabling period of the scan pulse at least one second driving pulse, and the enabling period of each first driving pulse and the enabling period of each second driving pulse are both smaller than the enabling period of the scan pulse And the enabling time and voltage of the first driving pulse and the second driving pulse are the same.

For example, as shown in FIG. 3A, the processing circuit 12 is used to provide the first driving pulse P11 of the data reading line Dm during the enabling period of the scan pulse P10 of the scan line Gm, and the first driving pulse P11 of the scan pulse P10 of the scan line Gm The second driving pulse P21 of the common potential line Vcom is provided in 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 shorter than the enabling period of the scanning pulse P10, and the first driving pulse The enabling time and voltage of P11 and the second driving pulse P21 are the same. Since both ends of the storage capacitor Cst in the sensing unit 11 are respectively applied with the same time and the same voltage via the first driving pulse P11 and the second driving pulse P21, in this way, regardless of the sensing unit 11 of the touch device 100 Whether the structure or size of the storage capacitor Cst used in the manufacturing process is the same, the two ends of the storage capacitor Cst of each sensing unit 11 are equipotential, so as to avoid voltage variation caused by the manufacturing process, thereby reducing noise interference , Making the detection result more accurate.

In addition, in the touch device 100 during the enabling period of the scan pulse of each scan line G1~Gm, and after the enabling period of each first driving pulse ends, the processing circuit 12 reads through the data reading lines D1~Dm The sensing data of the sensing unit 11, whereby the touch device 100 detects whether a fingerprint contact event occurs, and obtains a fingerprint pattern based on the data screen constructed from the sensing data. Specifically, as shown in FIG. 3A, after providing the first driving pulse P11 to the data read line Dm and the second driving pulse P21 to the common potential line Vcom, in the period t11, if the corresponding sensing unit 11 is not If touched, the sensing data is detected when the two ends of the storage capacitor Cst are equipotential, and the two ends of the storage capacitor Cst are almost equal to zero current. Conversely, if the corresponding sensing unit 11 is touched by a finger, the contact position is grounded via the human body in response to an inductive capacitor, so that the sensing data of the detected sensing unit 11 will be a potential that is obviously not equal to zero. Determine the occurrence of a fingerprint contact event. In this way, the touch device 100 detects whether a fingerprint contact event occurs, and obtains a fingerprint pattern based on the data frame constructed from the sensing data.

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

To further illustrate, FIG. 4 is a schematic diagram when a fingerprint contact event occurs in the sensing unit 11 of the present invention. 1 and 4, when the sensing unit 11 in the touch device 100 is touched by a finger, the finger applied to the glass cover plate corresponding to the sensing unit 11 and the surface of the glass cover plate will form The sensing capacitor Cf, and the corresponding sensing unit 11 responds 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. Finger-based fingerprint lines have crests and troughs, and the charge value charged by the sensing capacitor Cf responding to the crest of the fingerprint is greater than the charge value charged by the sensing capacitor Cf responding to the trough of the fingerprint. Therefore, when the processing circuit 12 reads the sensing data of the sensing unit 11 corresponding to each fingerprint contact event, one or more fingerprint patterns can be constructed according to different charge values. In the embodiment of the present invention, since the touch device 100 has a resolution of at least 200 dpi to 508 dpi, preferably a resolution of 508 dpi, there is enough sensing data to facilitate the construction of a fingerprint pattern.

Wherein, the method for the touch device 100 to detect whether a fingerprint contact event has occurred may be to sequentially provide a plurality of scan pulses to the scan lines G1~Gm, and provide each data read line D1 during the enabling period of each scan pulse. ~Dm at least one first driving pulse, during the enabling period of each scan pulse, one of the common potential lines Vcom is provided corresponding to at least one second driving pulse of the common potential line Vcom, and the processing circuit 12 uses the read sensing Whether the sensing data of the unit 11 is a potential that is obviously not equal to zero, it is determined whether a fingerprint contact event occurs.

Alternatively, the scan driving circuit 10 divides the scan lines G1 to Gm into multiple groups, and provides multiple scan pulses to the groups respectively. In other words, the scan driving circuit 10 can only provide scan pulses to part of the scan lines, and quickly determine whether a fingerprint contact event occurs. Wherein, the manner of dividing the scan lines G1~Gm into multiple groups can be adjusted according to actual implementation needs. Furthermore, when a fingerprint contact event is detected, the scanning can be expanded according to the corresponding range, so that the processing circuit 12 can read the sensing data of the sensor unit 11 corresponding to the fingerprint contact event to construct a fingerprint pattern.

5 is a schematic diagram of a multiplexer configuration of a touch device according to an embodiment of the present invention, where the touch device 200 further includes a plurality of multiplexers 21 or/and multiplexers 22, by matching the multiplexer 21/ The application of 22 can reduce the signal input line connecting the circuit control chip to multiple scan lines and multiple data lines. In addition, the driving method of the touch device 200 of this embodiment, the detection of fingerprint contact events, and the construction of fingerprint patterns are the same as those of the touch device 100 described above, and thus will not be repeated here.

5, the multiplexer 21 is electrically coupled between the scan driving circuit 10 and the scan lines G1 ~ Gm, each multiplexer has n input terminals and m output terminals, n and m are both positive integers And n is less than m, and the input terminal of the multiplexer 21 is used to receive the scan pulse provided by the scan driving circuit 10, and the output terminal of the multiplexer 21 is electrically coupled to the scan lines G1~Gm. In one embodiment, the multiplexer 22 is electrically coupled between the processing circuit 12 and the data reading lines D1~Dm. The multiplexer 22 has n input terminals and m output terminals, and both n and m are positive. It is an integer and n is less than m, and the input terminal of the multiplexer 22 is used to receive the first driving pulse provided by the processing circuit 12, and the output terminal of the multiplexer 22 is electrically coupled to the data reading lines D1 to Dm.

5 and 6A, in one embodiment, during the enable period of the scan pulse of the scan line G1, the processing circuit 12 sequentially transmits the first driving pulse to the data read line D1 through the multiplexer 22 ~Dm, and after the enabling period of the first driving pulse of each data reading line D1~Dm ends, the processing circuit 12 reads the sensing data of the sensing unit 11 through the same data reading line. In this way, the processing circuit 12 sequentially receives the sensing data, detects whether a fingerprint contact event occurs, and constructs a fingerprint pattern based on the sensing data.

Please refer to FIGS. 5 and 6B together. In one embodiment, the data read line is divided into a plurality of groups, and each of the groups can be in accordance with the enable period of the scan pulse of each scan line. The first driving pulse is sequentially transmitted. In detail, during the enable period of the scan pulse of the scan line G1, the processing circuit 12 simultaneously transmits the first driving pulse to the data read lines D1~D(m/n) through the multiplexer 22, and the data read After the enabling period of the first driving pulse of the lines D1 to D (m/n) ends, the data reading lines D1 to D (m/n) simultaneously read the sensing 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 on the data reading line D(m/n+1) After the enabling period of the first driving pulse of ~D(m*2/n) ends, the data reading lines D(m/n+1)~D(m*2/n) simultaneously read the sensing unit 11 Sensing data. Therefore, in the same way, it can be known that during the enable period of the scan pulse of each scan line, the first driving pulse is sequentially sent to multiple groups of data read lines to read the sensing data of the sensing unit. No longer.

In the foregoing embodiment, the sensing units in each column are coupled to the same common potential line. However, the present invention is not limited. In some examples, the sensing units in each column may be coupled to different common potential lines. As long as the sensing units of each column can make the two ends of the storage capacitor receive the same time and the same voltage during the enabling period 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 manufacturing process, the noise interference can be reduced, and the detection result can be more accurate.

FIG. 7 is a structural diagram of a touch device according to another embodiment of the invention. The operation principle of the touch device described in this embodiment is the same as that of the aforementioned touch device, and will not be repeated here. The difference is that, in the touch control device of this embodiment, part of the sensing units share a scan line. By sharing the scan lines with the sensing units in two consecutive rows, the number of wiring and the cost can be reduced. In addition, in the touch device described in this embodiment, the sensing units in each column are coupled to different common potential lines.

FIG. 8 is a timing diagram of main signals of the touch device of FIG. 7. Referring to FIGS. 7 and 8 together, the sensing units of two consecutive columns that share the scan line G1 are respectively coupled to different common potential lines VC1 and common potential line VC2, and the sense units of the two consecutive columns that share the scan line G2 are respectively coupled The measuring units are respectively coupled to different common potential lines VC3 and common potential lines VC4. For example, 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 unit of two consecutive rows and the common potential line VC1 have the same time and the same magnitude. The voltage, the data reading line D2 and the reading line D4 have the same time and the same magnitude as the common potential line VC2, so that the two ends of the storage capacitor of each sensing unit are at the same potential, so as to reduce noise interference and The effect of making the detection result more accurate. Wherein, the common potential line VC1 and the common potential line VC2 may be the same or different. Therefore, the operations on the scan line G2, the common potential line VC3 and the common potential line VC4 can be known in the same way, and will not be repeated here.

FIG. 9 is a structural diagram of a touch device according to another embodiment of the invention. FIG. 9 is similar to the touch device shown in FIG. 7 in that part of the sensing units can share one scan line. The difference between FIG. 9 and FIG. 7 is that part of the sensing units can also share a common potential line.

FIG. 10 is a timing diagram of main signals of the touch device of FIG. 9. 9 and 10, the sensing units of two consecutive rows that share the scan line G1 are respectively coupled to different common potential lines VC1 and the common potential line VC2, and the sense units of the two consecutive rows of the scan line G2 are commonly used. The measuring units are respectively coupled to different common potential lines VC2 and common potential lines VC3. During the enabling period of the scan pulse of the scan line G1, the data read line D1 and the read line D3 coupled to the sensing unit of the two consecutive rows and the common potential line VC1 have the same time and the same voltage, and the data The reading line D2 and the reading line D4 have the same time and the same voltage as the common potential line VC2. In addition, during 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 unit of the two consecutive rows have the same time and the same potential line VC2. The data reading line D2 and the reading line D4 have the same time and the same voltage as the common potential line VC3. Among them, 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 part of the sensing units in the touch device can share scan lines and common potential lines, which not only achieves the effect of reducing noise interference and making the detection results more accurate, but also increases the sensing Area, reduce the number of wiring and increase the aperture ratio, and reduce the cost.

A capacitive detection device according to an embodiment of the present invention, as shown in FIG. 11, includes a plurality of scan lines 1, a plurality of data read 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 reading line and each common potential line 3, the scan driving circuit is electrically coupled Each scan line 1 is used to sequentially provide a plurality of scan pulses to each scan line 1, and the processing circuit 5 is electrically coupled to each data reading line 2 and each common potential line 3, and is used for each scan pulse At least one first driving pulse is provided for each data reading line 2 during the enabling period, and at least one second driving pulse corresponding to the common potential line 3 in each common potential line 3 is provided during the enabling period of each scan pulse, each The enabling period of a first driving pulse and the enabling period of each second driving pulse are shorter than the enabling period of each scan pulse, and correspond to the enabling period of the first driving pulse and the second driving pulse of the same scan pulse The time and voltage are the same.

And each sensing unit in this example includes a transistor 41 and a storage capacitor 42. The transistor 41 has a first terminal 411, a second terminal 412, and a control terminal 410. The control terminal 410 is electrically coupled to the corresponding For each scan line 1, the first end 411 is electrically coupled to the corresponding data reading line 2, 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 terminal 501, a second terminal 502, and an output terminal 500. The second terminal 502 is electrically The first switch 51 has a third terminal 513 and a fourth terminal 514, the third terminal 513 is electrically coupled to the common potential line 3, and the fourth terminal 514 is electrically coupled to the data read line , The second switch 52 has a fifth terminal 525 and a sixth terminal 526, the fifth terminal 525 is electrically coupled to the data read line 2, the sixth terminal is electrically coupled to the first terminal 501, a capacitor 53 has a A seventh terminal 539 and an eighth terminal 538 are electrically coupled to the first terminal 501, and the eighth terminal 538 is electrically coupled to the output terminal 500. Wherein, when the first switch is turned on 51, the second switch 52 is not turned on, and the processing circuit 5 provides the voltage value (V _X ) of the preset potential (VSX) to the common potential line 3 during the on period of the second switch 52. In this example, the preset potential is coupled to the common potential line 3 through a retarder 7.

Refer also to FIG. 12, which is a flow chart of the driving method of the capacitive detection device in this example. First, in step 301, a scan pulse is provided for each scan line 1, and then in step 302, after the scan pulse At least one first driving pulse is provided for each data reading line 2 during the enabling period. Next, as in step 303, at least one second driving pulse for each common potential line 3 is provided during the enabling period of the scan pulse, wherein each first driving pulse The enabling period of the pulse and the enabling period of each second driving pulse are shorter than the enabling period of the scan pulse, and the enabling time and voltage of the first driving pulse and the second driving 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 multiple groups, and multiple scan pulses can be provided to the corresponding groups.

In the structure of the thin film transistor TFT, each scan line and common potential line can be freely controlled, and the fingerprint capacitance can be read through the conduction of the scan line and the common potential line. Refer to Figure 13 as well. 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 value of C _F (sensing capacitance), assuming the integrator is in Overflow (Cint) has been reset (reset), then Phi1, Phi2, and Vout will gradually change every time it goes through. The amount of change is proportional to C _F. The resulting capacitance is the fingerprint capacitance. The terminal is always connected to Vcom, so the capacitive detection device will not be interfered by parasitic capacitance.

The capacitive detection device of this example may be shown in FIG. 14, and includes multiple multiplexers 81, 82, and the multiplexers 81 are electrically coupled between the scan driving circuit 6 and the scan line 1. , The multiplexer 82 is electrically coupled between the scan driving circuit 5 and the data reading line 2, each multiplexer 81, 82 has n input terminals and m output terminals, n and m are both Is a positive integer and n is less than m, and any input terminal 811 of the multiplexer 81 is used to receive each scan pulse, and any output terminal 812 of the multiplexer 81 is electrically coupled to each scan line 1. The multiplexer 82 Any input terminal 821 is used to receive each first driving pulse, and any output terminal 822 of the multiplexer 82 is electrically coupled to each data reading line 2.

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

In the capacitive detection device and driving method of the present invention, since each scan line and common potential line can be freely controlled, the fingerprint capacitance can be read through the conduction of the scan line and the common potential line, and the parasitic capacitance Both ends are always connected to Vcom, so the capacitive detection device will not be interfered by the parasitic capacitance. Not only can it effectively avoid the influence caused by the parasitic capacitance, the circuit is also relatively simple, the overall area of the circuit is reduced, and all the above objectives are achieved.

Although the present invention has been disclosed as above in the preferred embodiment, it is not intended to limit the present invention. Anyone who is familiar with the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be subject to the scope of the attached patent application.

100, 200‧‧‧Touch device 20‧‧‧Touch area 21, 22‧‧‧Multiplexer Cst‧‧‧Storage capacitor Cf, C _F , 43‧‧‧Sense 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‧‧‧Pulse t11, t12, t13‧‧‧Period 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 driving circuit 5,12‧‧Processing circuit 41,T1 ‧‧‧Transistor 42‧‧‧Storage capacitor 411‧‧‧First end of storage capacitor 412‧‧‧Second end of storage capacitor 410‧‧‧Control terminal 50‧‧‧Amplifier 51‧‧‧First switch 52 ‧‧‧Second switch 53‧‧‧Capacitor 501‧‧‧The first terminal of the amplifier 502‧‧‧The second terminal of the amplifier 500‧‧‧The output terminal of the amplifier 513‧‧‧The third terminal of the first switch 514‧ ‧‧The fourth terminal of the first switch 525‧‧‧The fifth terminal of the second switch 526‧‧‧The sixth terminal of the second switch 539‧‧‧The seventh terminal of the capacitor 538‧‧‧The eighth terminal of the capacitor 7 ‧‧‧Retarder 81, 82‧‧‧Multiplexer 811,821‧‧‧Input 812,822‧‧‧Output 419‧‧‧The ninth terminal of the transistor 410‧‧‧The tenth of the transistor Terminal 400‧‧‧Control terminal phi1, Phi2 of the transistor‧‧‧Control signal V _X ‧‧‧Voltage value Vcom‧‧‧Common potential line

FIG. 1 is a structural diagram of a touch device according to an embodiment of the invention. 2 is a circuit diagram of a sensing unit according to an embodiment of the invention. FIG. 3A is a signal timing diagram of the sensing unit of FIG. 2. FIG. 3B is another signal timing diagram of the sensing unit of FIG. 2. 4 is a schematic diagram when a fingerprint contact event occurs in the sensing unit of the present invention. FIG. 5 is a schematic diagram of 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 in FIG. 5. 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 invention. FIG. 8 is a timing diagram of main signals of the touch device in FIG. 7. FIG. 9 is a structural diagram of a touch device according to another embodiment of the invention. FIG. 10 is a timing diagram of main signals of the touch device of FIG. 9. Fig. 11 is a circuit diagram of a capacitive detection device according to another embodiment of the present invention; Fig. 12 is a flowchart of the capacitive detection device in Fig. 11; Fig. 13 is a clock diagram of the capacitive detection device in Fig. 11; 14 is a circuit diagram of the capacitive detection device of FIG. 11 additionally provided with a multiplexer; FIG. 15 is a circuit diagram of a capacitive detection 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‧‧‧Sensing unit

6‧‧‧Scan drive circuit

5‧‧‧Processing circuit

41‧‧‧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‧‧‧Capacitor

501‧‧‧The first end of the amplifier

502‧‧‧The second end of the amplifier

500‧‧‧Amplifier output

513‧‧‧The third terminal of the first switch

514‧‧‧The fourth terminal of the first switch

525‧‧‧The fifth terminal of the second switch

526‧‧‧The sixth terminal of the second switch

53‧‧‧Capacitor

539‧‧‧The seventh terminal of the capacitor

538‧‧‧The eighth terminal of the capacitor

7‧‧‧Retarder

C _F ‧‧‧Sensing Capacitor

phi1, Phi2‧‧‧Control signal

Claims (17)

A capacitive detection 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 scan A driving circuit is electrically coupled to the scan line to provide a scan pulse for the scan line; and a processing circuit is electrically coupled to the data read line and the common potential line to enable the scan pulse At least one first driving pulse for the data read line is provided during the period, and at least one second driving pulse for the common potential line is provided during the enabling period of the scan pulse, and the enabling period of each first driving pulse is The enabling period of a second driving pulse is less than the enabling period of the scan pulse, and the enabling time and voltage of the first driving pulses and the second driving pulses are the same. According to the capacitive detection device described in claim 1, wherein the sensing unit includes: a transistor having a first end, a second end and a control end, and the control end is electrically coupled to the Scan line, and the first end is electrically coupled to the data read line; and a storage capacitor, one end of which is electrically coupled to the second end, and the other end is electrically coupled to the common potential line. A capacitive detection device includes: multiple scanning lines; multiple data reading lines; multiple common potential lines; A plurality of sensing units, each sensing unit is electrically coupled to one of the scan lines, one of the data reading lines, and one of the common potential lines; a scan driving circuit, Are electrically coupled to the scan lines, and used to sequentially provide scan pulses to the scan lines; and a processing circuit, electrically coupled to the data read lines and the common potential lines, and used to At least one first driving pulse is provided for each data read line during the enabling period of a scan pulse, and one of the common potential lines corresponding to at least one second common potential line is provided during the enabling period of each scan pulse For driving pulses, the enabling period of each first driving pulse and the enabling period of each second driving pulse are shorter than the enabling period of each scan pulse, and the first driving pulses and the first driving pulses corresponding to the same scan pulse The enabling time and voltage of these second driving pulses are the same. For the capacitive detection device described in item 3 of the scope of patent application, each sensing unit includes: a transistor having a first end, a second end and a control end, and the control end is electrically coupled One of the scan lines, the first end is electrically coupled to one of the data read lines; and a storage capacitor, one end of which is electrically coupled to the second end, and the other end is electrically coupled Connect to one of the common potential lines. For example, the capacitive detection device described in claim 3 further includes a plurality of multiplexers. The multiplexers are electrically coupled between the scan driving circuit and the scan lines. The multiplexer has n input terminals and m output terminals. Both n and m are positive integers and n is less than m. Any input terminal of each multiplexer is used to receive one of the scan pulses, and each Any output terminal of a multiplexer is electrically coupled to one of the scan lines. For example, the capacitive detection device described in item 3 of the scope of patent application further includes a plurality of multiplexers, and the multiplexers are electrically coupled between the processing circuit and the data reading lines, each The multiplexer has n input terminals and m output terminals, n and m are both positive integers and n is less than m, and any input terminal of each multiplexer is used to receive one of the first driving pulses , And any output terminal of each multiplexer is electrically coupled to one of the data reading lines. A method for driving a capacitive detection device. The capacitive detection device includes 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 and the The driving method for the data reading line and the common potential line includes: providing a scan pulse for the scan line; providing at least one first driving pulse for the data reading line during the enabling period of the scan pulse; and in the scan pulse The common potential line is provided with at least one second driving pulse during the enabling period, wherein the enabling period of each first driving pulse and the enabling period of each second driving pulse are both smaller than the enabling period of the scan pulse, and The enabling time and voltage magnitude of the first driving pulses and the second driving pulses are the same. A method for driving a capacitive detection device. The capacitive detection device includes multiple scan lines, multiple data read lines, multiple common potential lines, and multiple sensing units, each of which is 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; At least one first driving pulse is provided for each data read line during the enabling period of a scan pulse; and one of the common potential lines corresponding to at least one second common potential line is provided during the enabling period of each scan pulse Drive pulse, The enabling period of each first driving pulse and the enabling period of each second driving pulse are shorter than the enabling period of each scan pulse, and the first driving pulses and the first driving pulses corresponding to the same scan pulse The enabling time and voltage of the two driving pulses are the same. For example, the driving method described in claim 8 further includes dividing the scan lines into a plurality of groups, and respectively providing a plurality of scan pulses to the groups. A capacitive detection device includes: a scan line; a data read line; a common potential line electrically coupled to a preset potential; a sensing unit electrically coupled to the scan line and the data read Line and the common potential line; a scan driving circuit electrically coupled to the scan line to provide a scan pulse for the scan line; and a processing circuit electrically coupled to the data read line and the common potential line, For providing at least one driving pulse of the common potential line during the enabling period of the scan pulse, and the enabling period of each driving pulse is less than the enabling period of the scan pulse, the processing circuit includes: an amplifier having a A first terminal, a second terminal, and an output terminal, the second terminal is electrically coupled to the common potential line; a first switch has a third terminal and a fourth terminal, the third terminal is electrically coupled The common potential line, the fourth terminal is electrically coupled to the data reading line; a second switch has a fifth terminal and a sixth terminal, the fifth terminal is electrically coupled to the data reading line, the The sixth terminal is electrically coupled to the first terminal; and a capacitor having a seventh terminal and an eighth terminal, the seventh terminal is electrically coupled to the first terminal, and the eighth terminal is electrically coupled to the output end. For the capacitive detection device described in claim 10, when the first switch is turned on, the second switch is non-conductive, and the processing circuit makes the voltage of the predetermined potential during the turn-on period of the second switch The value is provided to this common potential line. In the capacitive detection device described in claim 10, the predetermined potential is coupled to the common potential line through a slow charger. A capacitive detection device includes: multiple scan lines; multiple data read lines; multiple common potential lines electrically coupled to a preset potential; multiple sensing units, each sensing unit electrically coupled Connected to 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 used to provide sequentially A plurality of scan pulses to the scan lines; and a plurality of processing circuits, each processing circuit is electrically coupled to at least one of the data reading lines and at least one of the common potential lines, and is used for In the enabling period of each scan pulse, one of the common potential lines is provided with at least one driving pulse corresponding to the common potential line. The enabling period of each driving pulse is shorter than the enabling period of each scan pulse. Each processing circuit It includes: an amplifier having a first end, a second end and an output end, the second end is electrically coupled to the common potential line; a first switch having a third end and a fourth end, the The third terminal is electrically coupled to the common potential line, the fourth terminal is electrically coupled to the data reading line; a second switch has a fifth terminal and a sixth terminal, and the fifth terminal is electrically coupled In the data reading line, the sixth terminal is electrically coupled to the first terminal; and a capacitor having a seventh terminal and an eighth terminal, the seventh terminal is electrically coupled to the first terminal, and the eighth terminal The terminal is electrically coupled to the output terminal. The capacitive detection device according to claim 13, wherein each processing circuit provides the corresponding common potential line of the common potential lines and the at least one driving pulse period, when the first switch is turned on , The second switch is non-conducting, and each processing circuit provides the voltage value of the predetermined potential to the common potential line during the conducting period of the second switch. The capacitive detection device according to claim 14, wherein, in the enabling period of each driving pulse of the processing circuits, the on time of the first switch is earlier than the on time of the second switch, After the enabling period of each driving pulse ends, the processing circuits read the sensing data of the sensing units through the data reading lines. For the capacitive detection device described in item 13 of the scope of patent application, each sensing unit includes: a transistor having a ninth terminal, a tenth terminal and a control terminal, and the control terminal is electrically coupled One of the scan lines, the ninth end is electrically coupled to one of the data reading lines; and a storage capacitor, one end of which is electrically coupled to the tenth end, and the other end is electrically coupled Connected to one of the common potential lines; wherein, during the period when the at least one processing circuit provides the at least one driving pulse corresponding to the common potential line in the common potential lines, a parasitic capacitance is formed in parallel with the storage capacitor; When a fingerprint contact event occurs, an induction capacitor is formed, wherein one end of the induction capacitor is coupled to the tenth terminal and the other end is coupled to the ground potential. For the capacitive detection device described in claim 13, each processing circuit further includes: a slow charger, one end of which is coupled to the preset potential, and the other end is coupled to at least one of the common potential lines one.

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