JP6754650B2 - Pressure detector and its control method - Google Patents

Description

The present invention relates to a pressure detection device and a control method thereof, and particularly to a technique for reducing power consumption.

Non-Patent Document 1, for example, describes a large-area pressure sensor or a flexible pressure sensor that detects a pressure distribution using small pressure sensors arranged two-dimensionally. In such a pressure detection device, active matrix control using a TFT (Thin-Film Transistor) is generally performed as in the image display panel. Active matrix control is a control method in which a TFT is provided between a pressure sensor arranged in a matrix and a signal output line, and a signal output from the pressure sensor to the signal output line is read when the TFT is activated. Say. The read pressure signal is AD-converted, and further signal processing, data analysis, and the like are performed.

Nanotech Japan Bulletin Vol. 6, No. 3, July 5, 2013, pp. 6-7

In the pressure detection device of Non-Patent Document 1, the active rows of the sensor array are sequentially switched by using a shift register or the like, and the pressure signal is read out column by column via the signal output line. The time change of the two-dimensional pressure distribution data is acquired. However, the shift register that drives the sensor array and the AD conversion circuit that reads out the pressure signal always operate regardless of the presence or absence of pressure and continue to consume power. Therefore, the power consumption in the state where no pressure is applied can be a big problem especially when the battery is driven.

The pressure detection device according to the present invention includes a pressure sensor that detects pressure and outputs a pressure signal according to the detected pressure value, and a first transistor that switches on / off the connection between the pressure sensor and the signal output line. A sensor array in which cells having, are arranged in a matrix, a gate driver for driving the first transistor via a gate line, a reading unit for reading a pressure signal via a signal output line, and a gate driver and a reading unit. A pressure detection device including a control unit for controlling, and the control unit is in a standby state in which when the pressure sensor of a cell does not detect pressure for a certain period of time, the control unit drives and reads only a predetermined specific cell. It is characterized by shifting the pressure detection device to.

Further, the control method of the pressure detection device according to the present invention is to turn on / off the connection between the pressure sensor and the signal output line, which detects the pressure and outputs a pressure signal according to the detected pressure value. A sensor array in which cells having a first transistor to be switched are arranged in a matrix, a gate driver for driving the first transistor via a gate line, a reading unit for reading a pressure signal via a signal output line, and a gate. It is a control method of a pressure detection device including a control unit that controls a driver and a reading unit, and when the pressure sensor of the cell does not detect the pressure for a certain period of time in the control unit, the pressure sensor of the cell is determined for a predetermined cell. It is characterized by having a step of shifting the pressure detection device to a standby state in which only driving and reading are performed.

According to the present invention, it is possible to obtain a pressure detection device and a control method thereof that can reduce power consumption in a state where pressure is not applied.

It is a schematic diagram which shows the structure of the pressure detection apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows the structure of the AD conversion part in the pressure detection apparatus which concerns on 1st Embodiment. It is a 1st flowchart which shows the control method of the pressure detection apparatus which concerns on 1st Embodiment. It is a 2nd flowchart which shows the control method of the pressure detection apparatus which concerns on 1st Embodiment. It is a schematic diagram which shows the arrangement example of the specific cell in the pressure detection apparatus which concerns on 2nd Embodiment. It is a schematic diagram which shows the structure of the pressure detection apparatus which concerns on 3rd Embodiment. It is a schematic diagram which shows an example of the structure of the AD conversion part in the pressure detection apparatus which concerns on 4th Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and can be appropriately modified without departing from the gist thereof. Further, in the drawings described below, those having the same function may be designated by the same reference numerals, and the description thereof may be omitted or simplified.

(First Embodiment)
The pressure detecting device according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a schematic view showing a configuration of a pressure detecting device according to the first embodiment. The pressure detection device of this embodiment includes a sensor array 1, a gate driver 2, a reading unit 3, a signal output line 4, and a gate line 5.

The sensor array 1 is configured by arranging cells 10 in a matrix. The gate driver 2 is configured by using, for example, a shift register, outputs a control signal SEL via the gate line 5, and sequentially switches the active rows of the sensor array 1. The reading unit 3 is configured to include a plurality of AD conversion units 30, and reads the pressure signal output from the pressure sensor 13 via the signal output line 4. Each gate line 5 is shared by cells 10 in the same row of the sensor array 1. Further, each signal output line 4 is shared by cells 10 in the same row of the sensor array 1.

Each cell 10 of the sensor array 1 has a pressure sensor 13 and a first transistor 11. The pressure sensor 13 detects the pressure and outputs a pressure signal according to the detected pressure value. As the pressure sensor 13, a pressure-sensitive material such as conductive rubber whose electric resistance value changes with the application of pressure can be used. Power is supplied to the pressure sensor 13 from a power supply VP (not shown). The first transistor 11 is, for example, a TFT gate, and switches on / off the connection between the pressure sensor 13 and the signal output line 4. The first transistor 11 is controlled by the control signal SEL output by the gate driver 2.

FIG. 2 is a schematic view showing an example of the configuration of the AD conversion unit 30 in the pressure detection device according to the first embodiment. The AD conversion unit 30 includes a comparator 31, a reference signal generator 32, a counter 33, and a counter clock generator 34. The reference signal generator 32 generates a RAMP signal that monotonically increases or decreases with time. The comparator 31 compares the magnitude of the pressure signal (VIN) output to the signal output line 4 with the reference signal output by the reference signal generator 32, and outputs the comparison result. The counter 33 counts the clock CK1 generated by the counter clock generator 34 within the time from the output of the RAMP signal to the change in the output of the comparator 31. The AD conversion unit 30 outputs the count value by the counter 33 as an AD conversion value (VOUT) of the pressure signal.

The reading unit 3 and the AD conversion unit 30 of the present embodiment are not necessarily limited to the configurations shown in FIGS. 1 and 2. For example, the reading unit 3 can connect a plurality of signal output lines 4 to one AD conversion unit 30 via a multiplexer (not shown) instead of connecting the AD conversion unit 30 for each signal output line 4. .. Further, the reading unit 3 does not necessarily include the AD conversion unit 30, and another reading circuit or the like may be used as long as the pressure signal output from the pressure sensor 13 can be read.

In this way, the pressure detection device uses the gate driver 2 to sequentially switch the active gate line 5 of the sensor array 1 while continuously performing an operation of reading a pressure signal via the signal output line 4. The time change of the two-dimensional pressure distribution data is acquired. However, as described above, the gate driver 2 that drives the sensor array 1 and the AD conversion unit 30 that reads out the pressure signal always operate and continue to consume power regardless of the presence or absence of pressure. Therefore, the power consumption in the state where no pressure is applied can be a big problem especially when the battery is driven.

Therefore, in the present embodiment, when the pressure sensors 13 of all the cells 10 do not detect the pressure for a certain period of time in the normal state, the pressure detection device is shifted to the standby state. Then, in the standby state, the drive by the gate driver 2 or the read by the read unit 3 is performed only for the plurality of specific cells 10a arranged in a distributed manner, and not for the other non-specific cells 10b. To. As a result, the power consumption in the state where no pressure is applied is reduced. Instead of reading the pressure signals from all the cells 10, the pressure signals may be read from a plurality of predetermined cells 10 of the sensor array 1.

In FIG. 1, the specific cell 10a is shown by a solid line square, and the non-specific cell 10b is shown by a broken line square. The gate driver 2 of the present embodiment outputs the control signal SEL only to the specific gate line 5a to which at least one specific cell 10a is connected in the standby state. The control signal SEL is not output to the other non-specific gate line 5b. As a configuration for that purpose, as shown in FIG. 1, the gate driver 2 of the present embodiment has a control signal line 7 to which a control signal STB (negative value) indicating that the standby state is input is input. It also has a switching circuit 21 that stops the operation of the shift register in the standby state. Further, it has a switching circuit 22 that outputs a control signal SEL only to the specific gate line 5a in the standby state.

When the control signal STB is 1 (HIGH), the switching circuit 21 fixes the signal line from which the clock CK0 is output to 0 (LOW) and stops the operation of each flip-flop 20 of the shift register. Further, when the control signal STB is 1 (HIGH), the switching circuit 22 fixes the non-specific gate line 5b to 0 (LOW) and stops driving the non-specific gate line 5b.

With such a configuration, in the standby state, the operation of the shift register of the gate driver 2 and the driving of the non-specific gate line 5b are stopped. In particular, in the standby state, the control signal of the gate driver 2 is maintained in a static state that does not change with time, so that the current component and electromagnetic radiation accompanying the time change of the control signal are suppressed, and the gate driver 2 Power consumption can be reduced.

Further, in the standby state, the reading unit 3 of the present embodiment reads only the specific cell 10a connected to the specific gate line 5a. No reading is performed for the other non-specific cells 10b. As a configuration for that purpose, as shown in FIG. 1, the non-specific cell 10b connected to the specific gate line 5a is connected in series with the first transistor 11 to turn on / on the connection between the pressure sensor 13 and the signal output line 4. It further has a second transistor 12 that switches off. The second transistor 12 is, for example, a TFT gate, and a control signal STB (negative value) indicating that the second transistor 12 is in a standby state is input to the gate terminal of the second transistor 12. When the control signal STB is 1 (HIGH), the second transistor 12 disconnects the connection between the pressure sensor 13 and the signal output line 4.

With such a configuration, in the standby state, not only the non-specific gate line 5b but also the non-specific cell 10b connected to the specific gate line 5a is stopped, so that the power consumption of the sensor array 1 is further reduced. be able to. Further, since reading to the non-specific cell 10b is not performed, the power consumption of the reading unit 3 can be reduced.

The non-specific cell 10b connected to the non-specific gate line 5b may or may not have the second transistor 12. In the standby state, the non-specific cell 10b connected to the non-specific gate line 5b is stopped by the switching circuit 22 of the gate driver 2 regardless of the presence or absence of the second transistor 12. In FIG. 1, the non-specific cell 10b connected to the non-specific gate line 5b does not have the second transistor 12. As a result, the manufacturing cost of the sensor array 1 can be reduced.

After that, the pressure detection device of the present embodiment monitors the pressure signal read from the specific cell 10a in the standby state. Then, when any of the specific cells 10a detects the pressure, the pressure detecting device is returned from the standby state.

3 and 4 are flowcharts showing a control method of the pressure detection device according to the first embodiment. FIG. 3 shows an example of the determination process when shifting the pressure detection device of the present embodiment to the standby state. Further, FIG. 4 shows an example of the determination process when the pressure detection device of the present embodiment is returned from the standby state. The processes shown in FIGS. 3 and 4 are executed by a control unit such as a CPU that controls the pressure detection device, for example.

First, the determination process when shifting the pressure detection device to the standby state will be described with reference to FIG. In step S101, the control unit starts a timer. Alternatively, if the timer has already started, restart the timer. As the timer, a timer attached to a CPU or the like that controls the pressure detection device may be used, or a timer function provided by an OS (Operating System) or the like may be used.

In step S102, the control unit reads a pressure signal from the pressure sensors 13 of all the cells 10 of the sensor array 1. Then, it is determined whether or not the pressure signals read from the cell 10 are smaller than the predetermined first threshold value. Instead of reading the pressure signals from all the cells 10, the pressure signals may be read from a plurality of predetermined cells 10 of the sensor array 1.

If the pressure signals read from the cell 10 are all smaller than the predetermined first threshold value (YES), the process proceeds to step S103. On the other hand, when at least one pressure signal read from the cell 10 is equal to or higher than the first threshold value (NO), the process returns to step S101, the timer is restarted, and step S102 is repeated.

In step S103, the control unit determines whether or not a certain period of time has elapsed since the timer was started. When a certain period of time has elapsed (YES) from the start of the timer, it is determined that the pressure has not been detected for a certain period of time, the process proceeds to step S104, and the sensor array 1 is shifted to the standby state. On the other hand, if a certain period of time has not elapsed since the timer was started (NO), the process returns to step S102 and the pressure detection by the cell 10 is repeated.

Next, a determination process for returning the pressure detection device from the standby state will be described with reference to FIG. In step S201, the control unit reads a pressure signal from the pressure sensors 13 of all the specific cells 10a of the sensor array 1. Then, it is determined whether or not at least one pressure signal read from the specific cell 10a is larger than a predetermined second threshold value. Instead of reading the pressure signals from all the specific cells 10a, the pressure signals may be read from a plurality of predetermined specific cells 10a of the sensor array 1.

If even one pressure signal read from the specific cell 10a is larger than a predetermined second threshold value (YES), it is determined that the pressure has been detected, the process proceeds to step S202, and the pressure detection device is returned from the standby state. .. On the other hand, when the pressure signals read from the specific cell 10a are all smaller than the second threshold value (NO), the process returns to step S201 and the pressure detection by the specific cell 10a is repeated. The second threshold value may be the same value as the first threshold value or may be a different value.

As described above, in the present embodiment, when the pressure sensor of the cell of the sensor array does not detect the pressure for a certain period of time, the pressure detection device is shifted to the standby state. Then, in the standby state, driving by the gate driver or reading by the reading unit is performed only for a predetermined specific cell. As a result, the power consumption in the state where no pressure is applied can be reduced. Further, since the pressure detection device of the present embodiment can be realized only by adding a logic circuit to the conventional configuration, it can be manufactured at a low cost.

(Second Embodiment)
Next, the pressure detection device according to the second embodiment will be described with reference to FIG. FIG. 5 is a schematic view showing an arrangement example of the specific cell 10a in the pressure detection device according to the second embodiment. FIG. 5 is a further schematic representation of the sensor array 1 shown in FIG. 1, in which the specific cells 10a of the sensor array 1 are indicated by white circles and the non-specific cells 10b are indicated by black circles. In FIG. 5, for convenience, the number of rows and columns of the sensor array 1 is 25, and the number of columns is 30, but the number of rows and columns of the sensor array 1 can be changed as appropriate.

In the sensor array 1 of the present embodiment, the specific gate lines 5a are provided at a row spacing M = 5, and the specific cells 10a are provided so that the number of the specific cells 10a connected to the signal output lines 4 in each column is one. It is arranged. Such a configuration can be realized by configuring the switching circuit 21 of the gate driver 2 shown in FIG. 1, the switching circuit 22, and the second transistor 12 of the non-specific cell 10b in accordance with the row spacing M.

In such a configuration, the gate driver 2 continues to drive the same specific gate line 5a, and the reading unit 3 continues to read the same specific cell 10a connected to the specific gate line 5a. Therefore, in the standby state, the control signal of the sensor array 1 is maintained in a static state that does not change with time. Therefore, the current component and electromagnetic radiation accompanying the time change of the control signal are suppressed, and the gate driver 2 Power consumption can be reduced.

The line spacing M is not limited to 5, and may be a natural number of 2 or more. Further, there may be a signal output line 4 to which the specific cell 10a is not connected. Further, in FIG. 5, the specific cells 10a are arranged at the same column spacing N = 5 as the row spacing M = 5, but the column spacing N is not limited to 5, and may be a natural number of 2 or more. Further, the column spacing N may be the same value as the row spacing M or may be a different value.

As described above, in the present embodiment, the specific gate lines are provided in the sensor array at row intervals of 2 or more, and the number of specific cells connected to the signal output lines in each column is 1 or less. As a result, the power consumption in the state where no pressure is applied can be further reduced.

(Third Embodiment)
Next, the pressure detection device according to the third embodiment will be described with reference to FIG. FIG. 6 is a schematic view showing the configuration of the pressure detection device according to the third embodiment. The pressure detection device shown in FIG. 6 further includes a power cutoff circuit 8 for switching on / off of power supply to the non-specific cell 10b, in addition to the configuration of the first embodiment shown in FIG. Since other configurations are almost the same as those of the first embodiment, the description thereof will be omitted. Hereinafter, a configuration different from that of the first embodiment will be described.

The power cutoff circuit 8 stops the power supply to the pressure sensor 13 of the non-specific cell 10b in order to further reduce the power consumption in the standby state. As a configuration for that purpose, as shown in FIG. 6, the power supply cutoff circuit 8 of the present embodiment has a third transistor 81 provided between the power supply terminal of the pressure sensor 13 of each non-specific cell 10b and the power supply VP. doing. A control signal STB (negative value) is input to the gate terminal of the third transistor 81. When the control signal STB is 1 (HIGH), the third transistor 81 turns off the power supply to the power supply terminal of the pressure sensor 13 of each non-specific cell 10b. As a result, the power supply terminal of the pressure sensor 13 of each non-specific cell 10b is in an open state (high impedance state) in the standby state and is maintained at the open voltage φP.

With such a configuration, in the standby state, the power supply to the non-specific cell 10b is stopped, and the power consumption of the sensor array 1 can be further reduced. On the other hand, in the normal state other than the standby state, the third transistor 81 is turned on, and power is supplied from the power supply VP to the power supply terminal of the non-specific cell 10b. Power is supplied to the pressure sensor 13 of the specific cell 10a from the power supply VP regardless of whether or not it is in the standby state.

The non-specific cell 10b of the present embodiment may or may not have the second transistor 12. In the standby state, the non-specific cell 10b is deactivated by stopping the power supply by the power cutoff circuit 8 regardless of the presence or absence of the second transistor 12. In FIG. 6, the non-specific cell 10b is configured not to have the second transistor 12. As a result, the manufacturing cost of the sensor array 1 can be reduced.

As described above, the present embodiment has a third transistor that controls on / off of power supply to the non-specific cell. Then, in the standby state, the third transistor is turned off. As a result, the power consumption in the state where no pressure is applied can be further reduced.

The power cutoff circuit 8 shown in FIG. 6 has two negative circuits 82 provided as buffers for sufficiently driving the third transistor 81 for power supply, but the third transistor 81 May be omitted if it can be sufficiently driven. Further, the power cutoff circuit 8 may be shared by all the non-specific cells 10b as shown in FIG. 6, or may be provided for each non-specific cell 10b.

(Fourth Embodiment)
Next, the pressure detection device according to the fourth embodiment will be described with reference to FIG. 7. FIG. 7 is a schematic view showing the configuration of the AD conversion unit 30b in the pressure detection device according to the fourth embodiment. The AD conversion unit 30b of the present embodiment shown in FIG. 7 further includes a reference signal switching unit 35 and an activation signal generator 36 in addition to the AD conversion unit 30 of the first embodiment shown in FIG. Since other configurations are almost the same as those of the first embodiment, the description thereof will be omitted. Hereinafter, a configuration different from that of the first embodiment will be described.

In the standby state, the reference signal switching unit 35 switches the reference signal to a predetermined constant voltage value VREF. The comparator 31 compares the magnitude of the pressure signal (VIN) output to the signal output line 4 with the constant voltage value VREF, and outputs the comparison result. The activation signal generator 36 outputs a control signal ACT for instructing recovery from the standby state when the signal value output from the comparator 31 changes. The value of the control signal ACT is inverted by, for example, a negative circuit (not shown), and the control signal ACT is output as the control signal STB shown in FIG.

If delay timing or the like becomes a problem simply by inverting the control signal ACT to obtain the control signal STB, the control signal ACT is once input to a control unit such as a CPU, and then the control signal ACT is performed by the control unit. The control signal STB may be output according to the above. In this case, the activation signal generator 36 can be integrated into a control unit such as a CPU.

The reference signal generator 32, the counter 33, and the counter clock generator 34 stop operating in the standby state. With such a configuration, in the standby state, the control signal of the AD conversion unit 30b is maintained in a static state that does not change with time, so that the current component and electromagnetic radiation accompanying the time change of the control signal are suppressed. , The power consumption of the reading unit 3 can be reduced. Instead of completely stopping the operation, the AD conversion unit 30b may be operated at a clock CK1 lower than the normal state, or the AD conversion unit 30b may be operated intermittently.

As described above, the AD conversion unit of the present embodiment detects the presence or absence of the pressure signal output to the signal output line in the standby state, and when at least one AD conversion unit detects the pressure signal, the pressure The detection device is restored from the standby state. As a result, the power consumption in the state where no pressure is applied can be further reduced.

As shown in FIG. 7, the activation signal generator 36 may be shared by the AD conversion units 30b of all columns, or may be provided for each AD conversion unit 30b. When the activation signal generator 36 is shared, the control signal ACT is output when at least one of the signals output from the comparator 31 of the AD conversion unit 30b in each row changes.

(Other embodiments)
All of the above-described embodiments are merely examples of implementation of the present invention, and the technical scope of the present invention should not be construed in a limited manner by these. That is, the present invention can be implemented in various forms without departing from the technical idea or its main features. For example, the above-described embodiment can be applied to a large area pressure sensor or a flexible pressure sensor. It can also be applied to a touch sensor or the like of a display device.

1: Sensor array 2: Gate driver 3: Read unit 4: Signal output line 5: Gate line 5a: Specific gate line 5b: Non-specific gate line 8: Power cutoff circuit 10: Cell 10a: Specific cell 10b: Non-specific cell 11 : 1st transistor 12: 2nd transistor 13: Pressure sensor 30: AD converter

Claims (9)

Cells having a pressure sensor that detects pressure and outputs a pressure signal according to the detected pressure value and a first transistor that switches on / off the connection between the pressure sensor and the signal output line are arranged in a matrix. The placed sensor array and
A gate driver that drives the first transistor via a gate wire,
A reading unit that reads out the pressure signal via the signal output line,
A control unit that controls the gate driver and the reading unit,
It is a pressure detector equipped with
The cell includes at least one specific cell defined in advance and a plurality of non-specific cells different from the at least one specific cell.
The sensor array is
A first row containing the at least one specific cell and the at least one non-specific cell,
The second row containing only the non-specific cell and
Have,
The at least one non-specific cell included in the first row in the cell further has a second transistor between one end of the pressure sensor and the source terminal or drain terminal of the first transistor. ,
The gate line includes a specific gate line, a non-specific gate line, and a control signal line.
The specific gate line is connected to the gate terminal of the first transistor included in the first row.
The non-specific gate line is connected to the gate terminal of the first transistor included in the second row.
The control signal line is connected to the gate terminal of the second transistor.
When the pressure sensor in the cell does not detect the pressure for a certain period of time, the control unit outputs a control signal via the specific gate line, the non-specific gate line, and the control signal line. and said first transistor included in the line to the on-state, and by turning off state the first transistor included in the second transistor and the second row, driven by only said at least one specific cell And a pressure detection device that controls the gate driver so as to perform reading and shifts the pressure detection device to the standby state. The pressure detection device according to claim 1, wherein the control unit returns the pressure detection device from the standby state when the specific cell detects a pressure in the standby state. The gate driver, wherein in the standby state, the pressure detecting apparatus according to claim 1 or 2 continues to drive the particular gate line. The pressure detection according to any one of claims 1 to 3, wherein the specific gate lines are provided at two or more row intervals, and the number of the specific cells connected to the signal output line in each column is 1 or less. apparatus. The reading unit has an AD conversion unit that AD-converts the pressure signal output to the signal output line.
The AD conversion unit detects the presence or absence of the pressure signal output to the signal output line in the standby state, and detects the presence or absence of the pressure signal.
The pressure detection device according to any one of claims 1 to 4 , wherein the control unit returns the pressure detection device from the standby state when the AD conversion unit detects the pressure signal. The AD conversion unit
A comparator that compares the pressure signal and the reference signal and outputs the comparison result,
In the standby state, a reference signal switching unit that switches the reference signal to a predetermined constant voltage value, and
The pressure detecting device according to claim 5 . The pressure sensor according to any one of claims 1 to 6 , wherein the pressure sensor is a pressure-sensitive material whose electric resistance value changes with application of pressure. The pressure sensor according to claim 7 , wherein the pressure sensor is a conductive rubber. Cells having a pressure sensor that detects pressure and outputs a pressure signal according to the detected pressure value and a first transistor that switches on / off the connection between the pressure sensor and the signal output line are arranged in a matrix. The placed sensor array and
A gate driver that drives the first transistor via a gate wire,
A reading unit that reads out the pressure signal via the signal output line,
A control unit that controls the gate driver and the reading unit,
Equipped with a,
The cell includes at least one specific cell defined in advance and a plurality of non-specific cells different from the at least one specific cell.
The sensor array is
A first row containing the at least one specific cell and the at least one non-specific cell,
The second row containing only the non-specific cell and
Have,
The at least one non-specific cell included in the first row in the cell further has a second transistor between one end of the pressure sensor and the source terminal or drain terminal of the first transistor. ,
The gate line includes a specific gate line, a non-specific gate line, and a control signal line.
The specific gate line is connected to the gate terminal of the first transistor included in the first row.
The non-specific gate line is connected to the gate terminal of the first transistor included in the second row.
The control signal line was connected to the gate terminal of the second transistor .
It is a control method of the pressure detection device.
When the pressure sensor in the cell does not detect the pressure for a certain period of time in the control unit, the first control signal is output via the specific gate line, the non-specific gate line, and the control signal line. and said first transistor included in the line to the on-state, and by turning off state the first transistor included in the second transistor and the second row, driven by only said at least one specific cell A control method comprising controlling the gate driver to perform reading and shifting the pressure detection device to a standby state.

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