JPH09152932A - Method for driving input device, input device driving system and coordinate input system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption. SOLUTION: This system is provided with a touch panel 1 for inputting data, a driving current applying means 100 for intermittently applying a driving current to the panel 1 and a driving current application period changing means 110 for changing the application period of the driving current by the means 100 and constituted so as to reduce power consumption by extending the application period of the driving current when input operation is not continued.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method applied to various input devices of a type that detects an input value by intermittently supplying a driving current, an input device driving system adopting this driving method, and further The present invention relates to a coordinate input system including an input device drive system.

[0002]

2. Description of the Related Art Various types of input devices, such as a touch panel type coordinate input device for inputting coordinates, are known as input devices of the type that detect an input value by intermittently supplying a drive current. . Here, a touch panel type coordinate input device is taken as an example. As shown in FIG. 13, the touch panel type coordinate input device is configured to guide an XY coordinate value signal obtained on the touch panel 1 to the A / D converter 3 via the switch unit 2. The switch unit 2 is a switch 2a for performing switching to supply a drive current from the power supply _Vcc to the Y2 electrode or the X2 electrode of the touch panel 1 via the switch 4, and a ground potential of the Y1 electrode or the X1 electrode of the touch panel 1. The switch 2b for switching to either of the electrodes and either the Y1 electrode or the X1 electrode of the touch panel 1
It is composed of a switch 2c for switching to take in the coordinate value or the Y coordinate value. These, switch 2
Each of a, 2b, and 2c is subjected to switching control by the X / Y switching frequency (a) generated from the frequency generation unit 5. The current on / off control unit 6 receives the X / Y switching frequency (a) and closes the switch 4 for a predetermined time in synchronization with the rising and falling of the pulse of the X / Y switching frequency (a).

With the above arrangement, when the X / Y switching frequency (a) changes as shown in FIG. 14 (a),
In synchronization with the rising and falling edges of this pulse, FIG.
As shown in (b) (after a predetermined margin) a predetermined time t _on only the switch 4 is closed, the current in the period of the predetermined time t _on is supplied to the touch panel 1.

The operation of detecting the XY coordinate values performed at this time will be described with reference to FIGS. 11 and 12. The touch panel 1 is composed of a transparent resistance sheet 7 for detecting the X coordinate value, a transparent resistance sheet 8 for detecting the Y coordinate value, and a spacer (not shown) interposed between these transparent resistance sheets. . The spacer is composed of an anisotropic resistance sheet or the like, and when there is no pen input (pressing) on the transparent resistance sheets 7 and 8, the transparent resistance sheets 7 and 8 are insulated from each other and the pen input (pressing) to the transparent resistance sheets 7 and 8 is performed. ),
The transparent resistance sheets 7 and 8 are connected by a predetermined resistance value.
Initially, the X / Y switching frequency (a) is at the H level, and the switches 2a, 2b, 2c are selected to select the X axis.
Selects each contact as shown in FIG. Therefore, the voltage of the power supply _Vcc is applied to the Y2 electrode and the ground potential is applied to the Y1 electrode, as shown in FIG. Also,
The X1 electrode and the A / D converter 3 are in a connected state. Therefore, when there is a pen input (press input) at point P shown in FIG. 11, the transparent resistance sheet 7 and the transparent resistance sheet 8 are
The spacer, which is an anisotropic resistance sheet or the like that insulates between and, conducts electricity between the transparent resistance sheet 7 and the transparent resistance sheet 8. As a result, a current corresponding to the voltage determined by the ratio of the distances from the Y2 electrode and the Y1 electrode to the point P flows to the transparent resistance sheet 7, and the X1 electrode causes A / D.
It reaches the converter 3. The voltage appearing at the X1 electrode is a voltage determined by the ratio of the distances from the Y2 electrode and the Y1 electrode to the input point P, and corresponds to the Y coordinate value of the input point P.
However, the Y coordinate value is finally determined in consideration of the voltage drop due to the current flowing through the transparent resistance sheet 7.

Next, when the X / Y switching frequency (a) falls and the L-level Y-axis period starts, the switches 2a, 2
b and 2c select contacts opposite to those in FIG. Therefore, the voltage of the power source _Vcc is applied to the X2 electrode and the ground potential is applied to the X1 electrode, as shown in FIG. Further, the Y1 electrode and the A / D converter 3 are connected. Therefore, a current corresponding to the voltage determined by the ratio of the distances from the X2 electrode and the X1 electrode to the point P is applied to the transparent resistance sheet 8
Flow to the A / D converter 3 from the Y1 electrode. Y1
The voltage appearing on the electrode is a voltage determined by the ratio of the distances from the X2 electrode and the X1 electrode, and corresponds to the X coordinate value of the input point P. However, the X coordinate value is finally determined in consideration of the voltage drop due to the current flowing through the transparent resistance sheet 8.

[0006]

However, in the above-mentioned conventional input device, the period in which the drive current is intermittently applied is as shown in FIG.
There is one type as shown in, and the same power consumption is performed regardless of whether or not an input operation is performed.

The current state of power consumption is not preferable in view of the tendency that an input device is often mounted on a portable terminal, and a method of driving the input device capable of reducing power consumption is demanded. It was being done.

The present invention has been made in response to such a demand, and an object thereof is to provide a driving method of an input device capable of reducing power consumption and an input device driving system employing the driving method. An object of the present invention is to provide a coordinate input system including an input device driving system.

[0009]

A method for driving an input device according to a first aspect of the present invention is a method for driving an input device in which an input value is detected by intermittently supplying a drive current, and the input operation is continued. The cycle of applying the drive current is changed based on whether or not the drive current is present. by this,
When the input operation is not continued, it is possible to reduce the power consumption by lengthening the cycle for applying the drive current.
Here, the input device includes various devices such as a touch panel type coordinate input device for inputting coordinates, in addition to the keyboard.

The driving method of the input device according to claim 2 is
A driving method of an input device for detecting an XY coordinate value by intermittently supplying a drive current, wherein the cycle for supplying the drive current is changed based on whether or not an input operation is continued, and the X coordinate value is changed. It is characterized in that the repetition cycle of the period for detecting the Y and the period for detecting the Y coordinate value is changed. As a result, when the input operation is not continued, it is possible to reduce the power consumption by lengthening the cycle for applying the drive current and lengthening the repetition cycle of the period for detecting the coordinate value.

The driving method of the input device according to the third aspect is
This is a method of driving an input device that detects an XY coordinate value by intermittently supplying a drive current, and when the time during which an input operation is not performed exceeds a predetermined time, the drive current is supplied to detect the presence or absence of an input. The cycle is updated, and the repeating cycle of the period for detecting the X coordinate value and the period for detecting the Y coordinate value is updated. As a result, if the time during which no input operation is performed exceeds the predetermined time, the cycle of applying the drive current is updated to detect the presence or absence of the input, thereby increasing the cycle of applying the drive current and reducing the power consumption. Will be able to

A method for driving an input device according to a fourth aspect is
The predetermined time in the driving method of the input device according to claim 3 is changed according to the input operation mode in the input device. As a result, the predetermined time during which the input operation is not performed is shortened, and it is possible to shift to the mode in which the period for applying the drive current is lengthened in a short time and reduce the power consumption.

According to another aspect of the input device drive system of the present invention, an input device for inputting data, a drive current applying means for intermittently supplying a drive current to the input device, and an input operation in the input device are continued. Drive current applying period changing means for changing the period for applying the drive current in the drive current applying means, based on whether or not the drive current applying means has changed. As a result, when the input operation is not continued, it is possible to reduce the power consumption by prolonging the cycle for supplying the drive current. Here, the input device includes various devices such as a touch panel type coordinate input device for inputting coordinates, in addition to the keyboard.

According to another aspect of the input device drive system of the present invention, an input device for inputting XY coordinate data, a drive current applying means for intermittently supplying a drive current to the input device, and an input operation are continued. Based on whether or not the drive current application cycle changing means for changing the cycle for applying the drive current, and whether or not the input operation is continued,
It is characterized by comprising XY detection cycle changing means for changing a repetition cycle of a period for detecting the X coordinate value and a period for detecting the Y coordinate value. As a result, when the input operation is not continued, it is possible to reduce the power consumption by lengthening the cycle for applying the drive current and lengthening the repetition cycle of the period for detecting the coordinate value.

An input device drive system according to a seventh aspect is the input device drive system according to the fifth or sixth aspect, wherein a time during which an input operation is not performed exceeds a predetermined time according to an input operation mode of the input device. And a mode control unit that updates the drive current supply cycle to the input device. As a result, the predetermined time during which the input operation is not performed is shortened according to the input operation mode in the input device, and it is possible to reduce the power consumption by shifting to the mode in which the period for applying the drive current is lengthened in a short time. .

According to another aspect of the present invention, there is provided an input device drive system, which is provided between the input device for inputting XY coordinate data, a power supply for supplying a drive current to the input device, and the power supply and the input device. A first switch, a current on / off control unit that controls the on / off of the first switch to change the cycle of intermittently supplying the current, and whether the X coordinate value or the Y coordinate value is detected by the input means. The second switch for switching the X, the period for detecting the X coordinate value, and the Y
A first frequency generating section for generating an X / Y switching frequency signal in a period for detecting a coordinate value; and a first frequency generating section for generating an X / Y switching frequency signal having a frequency different from the frequency generated by the first frequency generating section. 2 frequency generators, a selector for selecting one of the output of the first frequency generator and the output of the second frequency generator, and based on whether or not the input operation is continued. A timing control unit that controls the timing of switching the selector. As a result, the selectors are switched based on whether or not the input operation is continued, and the period for applying the drive current can be lengthened to reduce the power consumption.

An input device drive system according to a ninth aspect is provided with an input device for inputting XY coordinate data, a power supply for supplying a drive current to the input device, and a power supply provided between the power supply and the input device. A first switch, a current on / off control unit that controls the on / off of the first switch to change the cycle of intermittently supplying the current, and whether the X coordinate value or the Y coordinate value is detected by the input means. The second switch for switching the X, the period for detecting the X coordinate value, and the Y
A first frequency generating section for generating an X / Y switching frequency signal in a period for detecting a coordinate value; and a first frequency generating section for generating an X / Y switching frequency signal having a frequency different from the frequency generated by the first frequency generating section. A second frequency generating section, a selector for selecting one of the output of the first frequency generating section and the output of the second frequency generating section, and a timing control section for controlling the timing of switching the selector. A mode control unit that updates the switching timing for the selector when a time during which no input operation is performed exceeds a predetermined time according to the input operation mode in the input device. As a result, when the time during which the input operation is not performed exceeds the predetermined time according to the input operation mode in the input device, the switching timing for the selector is updated, and the cycle of applying the drive current is reviewed every predetermined time. Done.

An input device drive system according to a tenth aspect of the invention is provided with an input device for inputting XY coordinate data, a power supply for supplying a drive current to the input device, and a power supply provided between the power supply and the input device. A first switch, a current on / off control unit that controls the on / off of the first switch to change the cycle of intermittently supplying the current, and whether the X coordinate value or the Y coordinate value is detected by the input means. A second switch for switching between, a first frequency generating section for generating an X / Y switching frequency signal in a period for detecting the X coordinate value and a period for detecting the Y coordinate value, and the first frequency generating section. A second frequency generator that generates an X / Y switching frequency signal having a frequency different from the frequency to be generated, and an X / Y that has a frequency different from the frequencies generated by the first frequency generator and the second frequency generator. switching A third frequency generating section for generating a wave number signal, a first selector for selecting one of the output of the second frequency generating section and the output of the third frequency generating section, and the first selector. Second selector for selecting one of the output of the selector and the output of the first frequency generating section, a timing control section for controlling the switching timing of the second selector, and an input in the input device. The timing control unit is instructed of the switching timing based on whether or not the operation is continued, and if the time during which the input operation is not performed exceeds a predetermined time according to the input operation mode in the input device, the first And a mode control unit for updating the switching timing for the selector. As a result, it is possible to control the period for applying the drive current in three steps, and it is possible to finely reduce the power consumption.

The coordinate input system according to claim 11 is
An input device drive system according to any one of claims 5 to 10, and a coordinate value processing unit for processing coordinate values obtained from an input device of the input device drive system. . This can reduce power consumption in the coordinate input system.

According to a twelfth aspect of the coordinate input system,
A touch panel type coordinate input device in which an input device includes a transparent resistance sheet for detecting an X coordinate value, a transparent resistance sheet for detecting a Y coordinate value, and a spacer interposed between the transparent sheets. It is characterized by being. Accordingly, it is possible to reduce power consumption in the coordinate input system including the touch panel type coordinate input device.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an input device driving method, an input device driving system, and a coordinate input system according to embodiments of the present invention will be described with reference to the accompanying drawings. In each drawing, the same components are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 shows a configuration diagram of an input device drive system and a coordinate input system according to a first embodiment of the present invention. This system includes a coordinate value processing unit 1 that processes coordinate values obtained from a touch panel 1 that is an input device.
0 is provided, and a first frequency generator 13 for generating an X / Y switching frequency signal for a period for detecting the X coordinate value and a period for detecting the Y coordinate value via the selector 12 and the first frequency generator. A second frequency generator 14 is provided that generates an X / Y switching frequency signal having a frequency different from the frequency generated by the unit 13. The selector 12 is controlled by the timing control unit 11 that controls the switching timing based on whether or not the input operation is continued. As a result, the X / Y switching frequency 1 shown in FIG.
Or the signal of X / Y switching frequency 2 shown in FIG. 10C is transmitted from the selector 12.

The current on / off control unit 6 receives a signal of X / Y switching frequency 1 or a signal of X / Y switching frequency 2,
The switch 4 is closed for a predetermined time in synchronization with the rise and fall of the pulse. As a result, FIG.
As shown in FIG. 10D, in synchronization with the rising and falling of the pulse in FIGS. 10A and 10C (after a predetermined margin).
The switch 4 is closed for a predetermined time t _on , (b),
During the L period of the pulse shown in (d), the power supply V _cc
Is supplied to the touch panel 1.

The coordinate processing unit 10 is constructed as shown in FIG. That is, the CPU 20 is mainly configured by a CPU 20 including a microcomputer, and the CPU 20 controls each part based on the program and data of the memory part 21.
It processes input coordinate values. The memory unit 21 is the ROM 2
1-1 and RAM 21-2. CPU
A display controller 23, an input port 24, and an output port 25 are connected to 20 via a bus 22. The display controller 23 is connected to a display device 26 such as an LCD capable of dot matrix display, and the touch panel 1 is attached on this screen. Digital data of coordinate values from the A / D converter 3 is input from the input port 24, and an instruction for selection of the selector 12 is given to the timing control unit 11 from the output port 25. Further, a timer 27 is connected to the CPU 20, and it is possible to detect the time-up by setting an arbitrary set time. In this first embodiment, RO
One set time t is stored in M21-1, and is configured to be set in the timer 27.

The operation of the system configured as described above will be described with reference to the flowchart shown in FIG. When the system is powered on, the CPU 20 of the coordinate processing unit 10
Detects whether there is a touch (that is, pen input) based on the data from the input port 24 (S101). Since no data has been obtained at the beginning, whether the set time has come (time-up) is detected by referring to the timer 27 (S102). Initially, the timer 27 is up, the timer 27 is set to the set time t, and the timer 27 is started (S103). Then, the X / Y switching frequency 2 is set to the timing control unit 11 via the output port 26 (S104). As a result, the timing control unit 11 gives a selection signal to the selector 12 and selects the signal of the X / Y switching frequency 2 output from the second frequency generation unit 14.

As a result, due to the H level of the signal of the X / Y switching frequency 2 shown in FIG. 10 (c), the contacts of the switches 2a, 2b, 2c of the switch unit 2 become as shown in FIG. The on / off control unit 6 gives an L level signal to the switch 4 for a predetermined time t _on in synchronization with the rising of the signal of the X / Y switching frequency 2 to close the switch 4, and the X axis voltage is applied (S106). And the CPU 20 is A /
The data input via the D converter 3 is received to detect the X coordinate value (S107). On the other hand, after the current on / off control unit 6 gives the switch 4 an L level signal for a predetermined time t _on in synchronization with the rising edge of the X / Y switching frequency 2, this signal is raised to the H level. , X-axis voltage is turned off (S108).

Next, the switch unit 2 detects whether or not the signal of the X / Y switching frequency 2 is inverted and waits for the switching timing (S109), and the signal of the X / Y switching frequency 2 is inverted to the L level. Then, the switches 2a, 2 of the switch unit 2
Switching between b and 2c is performed (S110), and the process proceeds to the detection of the Y coordinate value. That is, the current on / off control unit 6 sets X /
A predetermined time t is synchronized with the fall of the signal of the Y switching frequency 2.
_{Applying an} L level signal only to _on to switch 4
Is closed and the Y-axis voltage is applied (S111). Then, the CPU 20 receives the data input via the A / D converter 3 and detects the Y coordinate value (S112).
On the other hand, after the current on / off control unit 6 gives the L level signal to the switch 4 for a predetermined time t _on in synchronization with the signal fall of the X / Y switching frequency 2, this signal is raised to the H level. Then, the Y-axis voltage is turned off (S11
3). Next, the switch unit 2 detects whether the signal of the X / Y switching frequency 2 is inverted and waits for the switching timing (S114), and the signal of the X / Y switching frequency 2 is inverted and becomes H.
At the level, each switch 2a, 2b of the switch unit 2,
2c is switched (S115).

Then, the CPU 20 uses the XY obtained above.
Whether there is a touch (that is, a pen input) is detected based on the coordinate value (S101). When such an operation is continued and a pen input is made at a certain time, the XY coordinate value corresponding to the point P is detected as described with reference to FIGS. 11 and 12, and the CPU 20 receives the pen input. To detect step S
At 101, the flow branches to YES, and the X / Y switching frequency 1 is set in the timing control unit 11 via the output port 26 (S105). As a result, the timing control unit 11
Gives a selection signal to the selector 12 to select the signal of the X / Y switching frequency 1 output from the first frequency generator 14. In the following, the drive current is supplied to the touch panel 1 in the cycle of the signal of the X / Y switching frequency 1 having a short cycle (FIG. 10 (d)), and the XY coordinate values are detected at an appropriate sampling cycle.

Although the touch panel 1 is used as the input device in the first embodiment, a keyboard or the like may be used as the input device. In the case of a keyboard, switching between the row line and column line of the key matrix is possible. The X / Y switching frequency signal is used.

Next, an input device drive system and a coordinate input system according to the second embodiment will be described with reference to FIG. As is clear from the configuration diagram of FIG. 5, this system has a configuration in which the mode control unit 15 of the coordinate value processing unit 10A gives an instruction to the timing control unit 11 to switch the selector 12. Here, the mode control unit 15 functions to update the switching timing for the selector 12 when the time during which no input operation is performed exceeds a predetermined time according to the input operation mode in the touch panel 1 which is the input device.

The coordinate value processing unit 10A has the configuration described in FIG. 3, but the memory unit 21 is configured as shown in FIG. That is, the ROM 2 of the memory unit 21
The area 31 of 1-1 stores the set time initial value data (zero) to be set for the timer 27, the area 32 stores the set time data for handwriting mode, and the area 33 of the area 33. The non-handwriting mode setting time data (time shorter than the handwriting mode setting time) is stored. Further, the register 34 of the RAM 21-2 stores the current input operation mode of the input device, that is, the data of the handwriting mode or the non-handwriting mode.

The touch panel 1, which is an input device, is
The input operation mode includes a handwriting mode and a non-handwriting mode such as a menu mode. When the system is started up, the menu mode is executed, and the coordinate value processing unit 10
A displays a menu such as "handwriting mode" or "numeric input mode" on the display 26 as shown in the menu mode of FIG. In this menu mode, selection can be performed by performing pen input in the item frame of the menu, and high resolution is not required. Similarly, also in the number input mode, selection can be performed by performing pen input in the number frame, and again, high resolution is not required. On the other hand, in the handwriting mode, it is necessary to trace the trajectory of pen input, and high resolution is required.

The operation of the system according to the second embodiment configured as described above will be described with reference to the flowchart of FIG. When the power of the system is turned on, the CPU 20 of the coordinate value processing unit 10A detects whether there is a touch (that is, pen input) based on the data from the input port 24 (S101). Since no data has been obtained at the beginning, the process proceeds to the next step, and the input operation mode is detected (S20).
1). Initially, the operation mode is not stored in the register 34 of FIG. 4, and the CPU 20 operates in the area 31 of the ROM 21-1.
The initial value (zero) of the set time is set in the timer 27 to start (S202). Next, the CPU 20 uses the timer 2
7, it is detected whether the set time has come (time-up) (S102). Since it is the set time in the initial stage, the time-up is detected, and the X / Y switching frequency 2 is set to the timing control unit 11 via the output port 26 (S104). As a result, the timing control unit 1
1 supplies a selection signal to the selector 12 to select the signal of the X / Y switching frequency 2 output from the second frequency generator 14. The processing operation of steps S201 and S202 as described above corresponds to the processing operation of the mode control unit 15.

Hereinafter, as described in the first embodiment, whether or not there is a touch is detected from the XY coordinate values (S101). While this operation is being performed, the initial screen of the display 26 displays the menu mode of FIG. 7, and the non-handwriting mode is written in the register 34 of the RAM 21-2. Therefore, when it is detected in step S101 that there is no touch and the process proceeds to step S201, the non-handwriting mode is referred to the register 34 of the RAM 21-2, and the timer 2 in step S202 is referred to.
In setting to 7, the non-handwriting mode set time data is read from the area 33 of the ROM 21-1 and set.

On the other hand, if there is a touch in step S101, the switching frequency 1 is set in the timing control unit 11 via the output port 26 (S105). As a result, the timing control unit 11 gives a selection signal to the selector 12 and selects the signal of the switching frequency 1 output from the first frequency generation unit 14. Below, X / with a short cycle
The drive current is supplied to the touch panel 1 in the cycle of the signal of the Y switching frequency 1 (FIG. 10A), and the XY coordinate values are detected at an appropriate sampling cycle. XY like this
If pen-up occurs while the coordinate value is detected, it is detected in step S101 that there is no touch, and the flow advances to step S201. In that case, RAM2
The non-handwriting mode stored in the register 34 of 1-2 is referred to, and in the setting to the timer 27 in step S202, the non-handwriting mode set time data is read from the area 33 of the ROM 21-1 and set. (S202). Since this set time is shorter than the set time for the handwriting mode, if there is no touch, the process immediately proceeds to step S104 and the X / Y switching frequency 2 with a long cycle is set.
The drive current is supplied to the touch panel 1 in the cycle of the signal, and power consumption is reduced.

On the other hand, when the pen input is performed in the handwriting mode on the touch panel 1, the RAM 2
Data indicating the handwriting mode is written in the register 34 of 1-2. Then, when pen-up occurs while pen input in the handwriting mode is made, it is detected in step S101 that there is no touch, and the process proceeds to step S201. In this case, the handwriting mode written in the register 34 of the RAM 21-2 is referred to, and the setting time data for the handwriting mode is read from the area 32 of the ROM 21-1 in setting the timer 27 in step S202. , Set. This setting time is longer than the setting time for non-handwriting mode,
In the waiting state where there is no touch, X with a short cycle
The waiting time for the drive current to be supplied to the touch panel 1 in the cycle of the signal of the / Y switching frequency 1 is long, and high resolution sampling is guaranteed no matter what the input is. That is,
In the second embodiment, the waiting time until the frequency for detecting and switching the XY coordinate values is lowered (that is, the set time of the timer 27) is changed according to the input operation mode to reduce the power consumption and the required waiting time. The state and are realized.

Next, an input device drive system and a coordinate input system according to the third embodiment will be described with reference to FIG. As is apparent from the configuration diagram of FIG. 3, in this system, in addition to the configurations of the input device drive system and the coordinate input system according to the second embodiment, the first frequency generation unit 13
And a signal of the X / Y switching frequency 3 having a frequency different from the frequency generated by the second frequency generator 13 (FIG. 10 (e)).
And a first selector 17 for selecting one of the output of the second frequency generator 14 and the output of the third frequency generator 16, and the first frequency generator 16 for generating The second selector 18 for selecting one of the output of the selector 17 and the output of the first frequency generator 13.

The timing control unit 11A controls the switching timing of the second selector 18, and the mode control unit 1
5A updates the switching timing of the first selector 17 and instructs the timing control unit 11A of the switching timing based on whether or not the input operation in the input device is continued. The update of the switching timing for the first selector 17 is performed when the time during which the input operation is not performed exceeds the predetermined time according to the input operation mode in the touch panel 1 which is the input device, that is, to YES in step S102 in FIG. It is done after the branch of.

The operation of the system according to the third embodiment configured as described above will be described with reference to the flowchart of FIG. CPU after system is powered on
The operation until 20 detects whether the set time has come (time-up) by referring to the timer 27 (S102) is the same as that of the second embodiment. Here, when the result of detecting whether the set time has come (time-up) is the set time, the mode control unit 15A controls the first selector 17. That is, whether or not the handwriting mode is detected based on the data in the register 34 of the RAM 21-2 (S301). If so, the first selector 17 is controlled so that the output of the third frequency generator 16 is obtained (S
302, S303).

As a result, when the touch is lost in the non-handwriting mode, the X / Y switching frequency 3 of a long cycle is longer than that in the handwriting mode.
Switching signal for the switch 4 in synchronization with the signal of FIG.
By (f), the switch 4 is turned on and off, and the power consumption is reduced.

Note that the timing control section 11A, as in the case of the second embodiment, makes the first control when there is a touch.
The second selector 18 is controlled so as to select the output of the frequency generator 13 (S105). Further, the timing control unit 11A, when there is no touch, generates the second frequency generation unit 14 or the third frequency generation unit that has a longer cycle than the output of the first frequency generation unit 13 output via the first selector 17. It functions to select the signal of the X / Y switching frequency 2 (or 3) which is the output of the unit 16. As a result, control is performed more finely than in the second embodiment, and power consumption is reduced and an appropriate input waiting state is realized.

In the above three embodiments, the number of frequency generators is two or three, but the number of frequency generators is three or four or more in accordance with the input operation mode, and more detailed control is performed. There are embodiments that realize a reduction in power consumption and an appropriate input waiting state.

[0042]

As described above, according to the driving method of the input device according to the first aspect, when the input operation is not continued, the period for supplying the driving current is lengthened to reduce the power consumption. You can

According to the driving method of the input device of the second aspect, when the input operation is not continued, the period for applying the drive current is made longer, and the repeating period of the period for detecting the coordinate value is made longer. Power consumption can be reduced.

According to the third aspect of the present invention, in the input device driving method, when the time during which the input operation is not performed exceeds the predetermined time, the period for applying the drive current is updated to detect the presence or absence of the input. Therefore, it is possible to reduce the power consumption by lengthening the cycle for applying the drive current.

According to the driving method of the input device of the fourth aspect, the predetermined time during which the input operation is not performed is shortened, and the mode is shifted to the mode in which the period for supplying the driving current is lengthened in a short time to reduce the power consumption. Can be achieved.

According to the input device drive system of the fifth aspect, when the input operation is not continued, it is possible to extend the period for supplying the drive current to reduce the power consumption.

According to the input device drive system of the sixth aspect, when the input operation is not continued, the period for applying the drive current is lengthened and the repetition period of the period for detecting the coordinate value is lengthened. It is possible to reduce power consumption.

According to the input device drive system of the seventh aspect, the predetermined time during which the input operation is not performed is shortened according to the input operation mode of the input device, and the period for applying the drive current is lengthened in a short time. The power consumption can be reduced by shifting to the mode.

According to the input device drive system of the eighth aspect, based on whether or not the input operation is continued,
It is possible to reduce the power consumption by switching the selectors and lengthening the period for applying the drive current.

According to the input device drive system of the ninth aspect, when the time during which the input operation is not performed exceeds the predetermined time according to the input operation mode in the input device, the switching timing for the selector is updated. It is possible to meticulously reduce the power consumption by reviewing the cycle of applying the drive current every predetermined time.

According to the input device drive system of the tenth aspect, the period for applying the drive current can be controlled in three stages.
It is possible to finely reduce the power consumption. According to the coordinate input system of the eleventh aspect, it is possible to reduce power consumption in the coordinate input system. According to the coordinate input system of the twelfth aspect, it is possible to reduce power consumption in the coordinate input system including the touch panel type coordinate input device.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an input device drive system and a coordinate input system according to a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the input device drive system and coordinate input system according to the first embodiment of the present invention.

FIG. 3 is a block diagram of a main configuration of an input device drive system and a coordinate input system according to an embodiment of the present invention.

FIG. 4 is a diagram showing the contents of a memory unit included in the input device drive system and the coordinate input system according to the second and third embodiments of the present invention.

FIG. 5 is a configuration diagram of an input device drive system and a coordinate input system according to a second embodiment of the present invention.

FIG. 6 is a flowchart for explaining the operation of the input device drive system and coordinate input system according to the second embodiment of the present invention.

FIG. 7 is a diagram showing a display screen of each mode in the input device drive system and the coordinate input system according to the embodiment of the present invention.

FIG. 8 is a configuration diagram of an input device drive system and a coordinate input system according to a third embodiment of the present invention.

FIG. 9 is a flowchart for explaining the operation of the input device drive system and coordinate input system according to the third embodiment of the present invention.

FIG. 10 is a diagram showing a switch switching signal used in the input device drive system and the coordinate input system according to the embodiment of the present invention.

FIG. 11 is a diagram for explaining the configuration of the touch panel unit used in the input device drive system and the coordinate input system and the X coordinate detection operation according to the embodiment of the present invention.

FIG. 12 is a view for explaining the configuration of the touch panel unit used in the input device drive system and the coordinate input system and the Y coordinate detection operation according to the embodiment of the present invention.

FIG. 13 is a configuration diagram of a conventional input device drive system and coordinate input system.

FIG. 14 is a diagram showing a switch switching signal used in a conventional input device drive system and coordinate input system.

[Explanation of symbols]

1 Touch Panel 2 Switch Section 3 A / D Converter 4 Switch 6 Current On / Off Control Section 10, 10
A, 10B Coordinate value processing unit 11, 11A Timing control unit 12 Selector 13 First frequency generation unit 14 Second frequency generation unit 15, 15A Mode control unit 16 Third frequency generation unit 17 First selector 18 Second Selector 100 Drive current applying means 110 Drive current applying cycle changing means 120 XY detection cycle changing means

Claims (12)

[Claims] 1. A method of driving an input device, wherein an input value is detected by intermittently supplying a drive current, wherein a cycle of supplying the drive current is changed based on whether or not an input operation is continued. A method for driving an input device, which is characterized. 2. An X is obtained by intermittently supplying a drive current.
In a method of driving an input device for detecting a Y coordinate value, a period for applying the drive current is changed based on whether or not an input operation is continued, and a period for detecting the X coordinate value and a Y coordinate value are detected. A method for driving an input device, comprising: changing a repetition cycle of a period to be set. 3. A drive current is applied intermittently to X.
In the method of driving the input device for detecting the Y coordinate value, when the time during which the input operation is not performed exceeds a predetermined time, the period for applying the drive current is updated to detect the presence or absence of the input, and the X coordinate value is changed. A method of driving an input device, comprising: updating a repetition cycle of a period for detecting and a period for detecting a Y coordinate value. 4. The method for driving an input device according to claim 3, wherein the predetermined time is changed according to an input operation mode in the input device. 5. An input device for inputting data, a drive current applying means for intermittently supplying a drive current to the input device, and the input device, based on whether or not an input operation is continued. An input device drive system, comprising: a drive current applying period changing unit that changes a period of applying the drive current in the drive current applying unit. 6. An input device for inputting XY coordinate data, drive current applying means for intermittently supplying a drive current to the input device, and the drive current based on whether or not an input operation is continued. And a XY that changes the repetition cycle of the period for detecting the X coordinate value and the period for detecting the Y coordinate value based on whether or not the input operation is continued. An input device drive system comprising: a detection cycle changing unit. 7. A mode control unit is provided for updating the supply cycle of the drive current to the input device when the time during which the input operation is not performed exceeds a predetermined time according to the input operation mode of the input device. The input device drive system according to claim 5 or 6. 8. An input device for inputting XY coordinate data, a power supply for supplying a drive current to the input device, a first switch provided between the power supply and the input device, and the first switch. A current on / off controller that controls the on / off of the switch to change the cycle of intermittently applying the current; a second switch that switches between detection of the X coordinate value and detection of the Y coordinate value in the input means; X in the period for detecting the X coordinate value and the period for detecting the Y coordinate value
A first frequency generating section for generating a / Y switching frequency signal; a second frequency generating section for generating an X / Y switching frequency signal having a frequency different from the frequency generated by the first frequency generating section; A selector for selecting either the output of the first frequency generating section or the output of the second frequency generating section, and the timing for switching the selector based on whether or not the input operation is continued An input device drive system, comprising: 9. An input device for inputting XY coordinate data, a power supply for supplying a driving current to the input device, a first switch provided between the power supply and the input device, and the first switch. A current on / off controller that controls the on / off of the switch to change the cycle of intermittently applying the current; a second switch that switches between detection of the X coordinate value and detection of the Y coordinate value in the input means; X in the period for detecting the X coordinate value and the period for detecting the Y coordinate value
A first frequency generating section for generating a / Y switching frequency signal; a second frequency generating section for generating an X / Y switching frequency signal having a frequency different from the frequency generated by the first frequency generating section; A selector for selecting one of the output of the first frequency generating section and the output of the second frequency generating section, a timing control section for controlling the timing of switching the selector, and a time during which no input operation is performed. And a mode control unit for updating the switching timing for the selector when a predetermined time period according to the input operation mode of the input device is exceeded, the input device drive system. 10. An input device for inputting XY coordinate data, a power supply for supplying a drive current to the input device, a first switch provided between the power supply and the input device, and a first switch. A current on / off control unit for controlling on / off of a switch to change a cycle for intermittently applying the current; a second switch for switching between detection of an X coordinate value and detection of a Y coordinate value in the input means; X of the value detection period and the Y coordinate value detection period
A first frequency generating section for generating a / Y switching frequency signal; a second frequency generating section for generating an X / Y switching frequency signal having a frequency different from the frequency generated by the first frequency generating section; A third frequency generating section for generating an X / Y switching frequency signal having a frequency different from the frequencies generated by the first frequency generating section and the second frequency generating section; and the output of the second frequency generating section and the output. A first selector for selecting any one of the output of the third frequency generator, and a first selector for selecting one of the output of the first selector and the output of the first frequency generator. A second selector, a timing control unit that controls switching timing of the second selector, and a switching timing that is instructed to the timing control unit based on whether or not an input operation in the input device is continued. To, exceeds a predetermined time which the input operation is not performed according to the input operation mode in the input device time,
An input device drive system, comprising: a mode control unit that updates a switching timing for the first selector. 11. The method according to any one of claims 5 to 10.
A coordinate input system comprising: the input device drive system according to the item 1; and a coordinate value processing unit that processes a coordinate value obtained from an input device of the input device drive system. 12. A touch panel comprising: an input device; a transparent resistance sheet for detecting an X coordinate value; a transparent resistance sheet for detecting a Y coordinate value; and a spacer interposed between these transparent sheets. The coordinate input system according to claim 11, which is a die coordinate input device.