JP2014203211A - Touch sensor system, integrated circuit, and electronic apparatus - Google Patents

Abstract

A touch sensor system capable of excluding input to a touch panel by hand is provided. When the pressure removal processing unit (2) of the touch sensor system (1) determines that the pressure detected by the pressure sensor (6) is larger than the pressure threshold, the capacity distribution calculation unit (3) calculates the pressure. In the first capacitance map indicating the capacitance distribution of the touch panel (5), the second region where the capacitance generated by handling is distributed is specified, and the capacitance value in the second region is determined. A second capacitance map generated by replacing with a zero value indicating a state where there is no touch input is given to the touch recognition unit (4). [Selection] Figure 1

Description

  The present invention relates to a touch sensor system and an electronic device including the touch sensor system.

  The touch sensor system determines an input to the touch panel by a touch pen or a finger by detecting a change in capacitance in the capacitive touch panel. That is, the touch sensor system detects a change in capacitance caused by the touch pen or finger touching the touch panel, and determines a position where the change in capacitance occurs on the touch panel as an input position on the touch panel.

  Accordingly, an input unintended by the user may be given to the touch panel. For example, when the user performs input to the touch panel using the touch pen, a situation where a part of the user's hand holding the touch pen (for example, a part of the palm) contacts the touch panel is assumed.

  At this time, the touch sensor system detects a change in capacitance caused by a part of the user's hand touching the touch panel, and determines that an input to the touch panel is given at a position where the change in capacitance occurs. To do.

  That is, the touch sensor system further accepts an input to the touch panel by a part of the user's hand, which is different from the input with the touch pen intended by the user. This phenomenon is known as malfunction of the touch sensor system due to “hand”.

  In recent years, a touch sensor system having a palm rejection function has been proposed as a technique for suppressing malfunction of a touch sensor system due to handling. A touch sensor system having a palm rejection function discriminates between a touch pen and a palm, thereby excluding an input caused by touching the palm and accepting only an input by the touch pen, which is an input intended by the user, as an input to the touch panel. It is possible.

  Patent Document 1 discloses a touch panel device that excludes manual input to a touch panel.

JP 2006-39686 A (published on February 9, 2006)

  However, in the touch panel device disclosed in Patent Document 1, it is necessary that (i) input with a touch pen and (ii) input with touch on the touch panel occur within substantially the same time range. It is said that.

  For this reason, when (i) touch pen input and (ii) hand touch input are individually given to the touch panel with a certain time difference (for example, hand touch input becomes touch pen input) In the case where it is given in advance), there is a problem that it is not possible to exclude manual touch panel input.

  In addition, since it is not easy to distinguish between a finger and a palm in a touch panel device, when a user aligns a plurality of fingers and gives input by the finger to the touch panel, it is not possible to exclude touch input from the touch panel There is a problem that it is difficult.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a touch sensor system that can exclude manual touch panel input.

  In order to solve the above problem, a touch sensor system according to one embodiment of the present invention includes a touch panel in which a plurality of capacitances (C11 to Cnm) are distributed in a matrix, and the capacitance value of the touch panel. A first capacitance map generation unit that calculates a first capacitance map indicating a distribution, and a coordinate value of a touch input on the touch panel calculated based on the first capacitance map; A touch recognition unit that outputs to a host device provided in the touch sensor system, wherein the touch sensor system includes a pressure sensor that detects a value of pressure applied to the touch panel, and the pressure sensor. A pressure condition determining unit that determines whether the detected pressure value is greater than a pressure threshold value; and the pressure condition determining unit. When the pressure value is determined to be larger than the pressure threshold value, in the first capacitance map, a first region in which capacitance generated by input with a touch pen or a finger is distributed; Touch input is used to specify a region specifying unit that specifies a second region in which capacitance generated by touch input is distributed, and a capacitance value in the second region of the first capacitance map. And a second capacitance map generating unit that provides the touch recognition unit with a second capacitance map generated by replacing with a zero value indicating a non-existing state.

  According to the touch sensor system according to one aspect of the present invention, there is an effect that input to the touch panel by hand can be excluded.

It is a functional block diagram showing schematic structure of the touch sensor system which concerns on Embodiment 1 of this invention. It is a figure which shows typically the mode of touch in the touch sensor system which concerns on Embodiment 1 of this invention. It is a perspective view which shows the example of arrangement | positioning of the pressure sensor in the touch sensor system which concerns on Embodiment 1 of this invention, (a) has shown the example by which four pressure sensors are arrange | positioned, (b), An example is shown in which five pressure sensors are arranged. It is a functional block diagram which shows the detailed structure of the removal processing part with a handle in the touch sensor system which concerns on Embodiment 1 of this invention. It is a graph which shows roughly the electrostatic capacity map in the touch panel concerning Embodiment 1 of the present invention, (a) shows the 1st electrostatic capacity map, and (b) of Drawing 5 shows the 2nd A capacitance map is shown. It is a flowchart which shows the flow of a process of the input detection in the touch sensor system which concerns on Embodiment 1 of this invention. It is a functional block diagram showing the structure of the electronic device provided with the touch sensor system based on Embodiment 2 of this invention.

Embodiment 1
An embodiment of the present invention will be described below with reference to FIGS.

(Configuration of touch sensor system 1)
FIG. 1 is a functional block diagram showing a schematic configuration of a touch sensor system 1 of the present embodiment. The touch sensor system 1 includes a touch panel 5, a pressure sensor 6, and a capacitance value distribution detection circuit 12. A host device 11 is provided outside the touch sensor system 1.

(Touch panel 5)
The touch panel 5 includes n (n is a natural number) drive lines HL1 to HLn arranged in parallel with each other in the horizontal direction. The touch panel 5 includes m (m is a natural number) sense lines VL1 to VLm arranged in parallel with each other along the vertical direction.

  FIG. 2 is a diagram showing a positional relationship between the drive lines HL1 to HLn and the sense lines VL1 to VLm in the touch panel 5. In the touch panel 5, an electrostatic capacitance Cxy is formed at the intersection of the x (1 ≦ x ≦ n) th drive line HLx and the y (1 ≦ y ≦ m) th sense line VLY.

  Accordingly, in the touch panel 5, capacitance is formed at each intersection of the drive lines HL1 to HLn and the sense line sense lines VL1 to VLm. As a result, the touch panel 5 has (n × m) capacitances C11 to Cnm distributed in a matrix.

  FIG. 2 schematically shows that the user gives an input to the touch panel 5 with the touch pen 80 while holding the hand 81 on the touch panel 5.

(Pressure sensor 6)
Here, with reference to FIG. 3, the pressure sensor 6 of this embodiment is demonstrated. FIGS. 3A and 3B are perspective views respectively showing arrangement examples of the pressure sensor 6 with respect to the touch panel 5 in the touch sensor system 1 of the present embodiment, and the pressure sensor 6 is applied to the touch panel 5. It is provided to detect pressure.

  In FIG. 3A, four pressure sensors are arranged with respect to the touch panel 5 as the pressure sensors 6. Here, a housing 51 that holds the touch panel 5 is provided on the back surface (lower surface) of the touch panel 5. Further, one circular pressure sensor is provided in the vicinity of the four corners (corner portions) of the casing 51. A total of four pressure sensors provided near the four corners of the casing 51 are collectively referred to as pressure sensors 6. In this way, the pressure sensor 6 is arranged with respect to the touch panel 5, and can detect the pressure applied to the touch panel 5 in the entire range of the touch panel 5.

  Further, in FIG. 3B, a display device 52 is disposed between the touch panel 5 and the housing 51. Furthermore, one square pressure sensor is provided near each of the four corners (corner portions) and the center of the casing 51. A total of five pressure sensors provided near the four corners and the center of the casing 51 are collectively referred to as pressure sensors 6. In this way, the pressure sensor 6 is arranged with respect to the touch panel 5, and can detect the pressure applied to the touch panel 5 in the entire range of the touch panel 5.

  Note that the shape, number, and arrangement location of the pressure sensor 6 are not limited to the arrangement examples shown in FIGS. 3A and 3B, and the pressure sensor 6 is applied to the touch panel 5. Any configuration that can detect the pressure in the entire range of the touch panel 5 may be used.

  For example, in FIG. 3A, four pressure sensors may be arranged at positions corresponding to the midpoints of the sides of the rectangular touch panel 5. Further, the shape of the touch panel 5 is not limited to a quadrangle, and may be a circle, for example. In this case, each of the four pressure sensors is indicated by a center angle θ of the circle, for example, θ = 0 °, 90 °, 180 °, and 270 °, which are located at equal intervals on the circular arc of the circular touch panel. Each point on the arc).

  Further, the value of the pressure P detected by the pressure sensor 6 and applied to the touch panel 5 is given to the manual removal processing unit 2 described later.

(Capacitance value distribution detection circuit 12)
The capacitance value distribution detection circuit 12 includes a manual removal processing unit 2, a capacitance distribution calculation unit 3 (first capacitance map generation unit), a touch recognition unit 4, a driver 7, a sense amplifier 8, an AD converter 9, and timing. A generator 10 is provided.

  The detailed operation of the manual removal processing unit 2 will be described later with reference to FIG. Here, the operation of the members after the capacity distribution calculation unit 3 will be described.

(Capacity distribution calculation unit 3)
The capacitance distribution calculation unit 3 is a touch panel based on a linear sum as a digital signal corresponding to the value of each capacitance Cxy (1 ≦ x ≦ n, 1 ≦ y ≦ m) given from the AD converter 9. 5 to calculate the capacitance distribution. The capacitance distribution calculation unit 3 gives a first capacitance map indicating the capacitance distribution on the touch panel 5 to the manual removal processing unit 2.

(Touch recognition unit 4)
The touch recognition unit 4 acquires a second capacitance map generated from the removal processing unit 2 with the hand based on the first capacitance map in the removal processing unit 2 with the hand.

  The touch recognition unit 4 calculates input coordinates indicating the position of an input given to the touch panel 5 by the touch pen 80 or the user's finger based on the second capacitance map, and uses the calculated input coordinates of the touch sensor system 1. The data is output to the host device 11 provided outside.

  The host device 11 is a processor provided outside the touch sensor system 1, and executes application software processing based on input coordinates given from the touch recognition unit 4.

(Driver 7)
The driver 7 applies voltage signals based on the code series to the n drive lines HL1 to HLn included in the touch panel 5, respectively, and drives the drive lines HL1 to HLn. When the driver 7 drives the drive lines HL1 to HLn, the capacitances C11 to Cnm in the touch panel 5 are formed.

  The timing at which the driver 7 drives the drive lines HL1 to HLn is defined by the timing generator 10.

(Sense amplifier 8)
The sense amplifier 8 reads m linear sums Y1 to Ym from the sense lines VL1 to VLm as linear sums corresponding to the (n × m) electrostatic capacitances C11 to Cnm formed in the touch panel 5, respectively. .

That is,
Y1 is a linear sum of capacitances C11, C21,..., Cn1, and is read from the sense line VL1.
Y2 is a linear sum of capacitances C12, C22,..., Cn2, and is read from the sense line VL2.
(... Omitted ...)
Ym is a linear sum of capacitances C1m, C2m,..., Cnm, and is read from the sense line VLm.

  The linear sums Y1 to Ym are voltage signals indicating a linear sum corresponding to (n × m) electrostatic capacitances C11 to Cnm. The sense amplifier 8 gives the AD converter 9 linear sums Y1 to Ym as analog signals read from the sense lines VL1 to VLm, respectively.

  Note that the timing generator 10 defines the timing at which the sense amplifier 8 reads the linear sums Y1 to Ym from the sense lines VL1 to VLm.

(AD converter 9)
The AD (Analog-Digital) converter 9 converts the linear sums Y1 to Ym as analog signals given from the sense amplifier 8 into digital signals. That is, the AD converter 9 performs AD conversion on the linear sums Y1 to Ym.

  The linear sums Y1 to Ym digitized by the AD converter 9 are given to the capacitance distribution calculation unit 3. The linear sums Y1 to Ym are given as digital signals to the capacitance distribution calculation unit 3, so that the capacitance distribution calculation unit 3 performs various calculations on the linear sums Y1 to Ym for calculating the electrostatic capacitance distribution on the touch panel 5. Is facilitated.

  Note that the timing generator 10 defines the timing at which the AD converter 9 performs AD conversion on the linear sums Y1 to Ym.

(Timing generator 10)
The timing generator 10 is provided to define the operation timings of the driver 7, the sense amplifier 8, and the AD converter 9, respectively.

  The timing generator 10 generates a driver operation signal, a sense amplifier operation signal, and an AD converter operation signal as signals that define the operation timing of the driver 7, the sense amplifier 8, and the AD converter 9. , To the sense amplifier 8 and the AD converter 9, respectively.

(Configuration of the manual removal processing unit 2)
Hereinafter, the configuration of the manual removal processing unit 2 will be described with reference to FIG. FIG. 4 is a functional block diagram showing a detailed configuration of the manual removal processing unit 2. The handling removal processing unit 2 includes a determination unit 21 (pressure condition determination unit), a specification unit 22 (region specification unit), and a replacement unit 23 (second capacitance map generation unit).

The determination unit 21 acquires the value of the pressure P applied to the touch panel 5 from the pressure sensor 6. The determination unit 21 determines whether the value of the pressure P applied to the touch panel 5 is larger than the value of the predetermined pressure threshold value _PT , that is,
P> P _T (pressure judgment condition)
Determine whether is satisfied.

Here, the pressure threshold P _T may be a specific value (for example, 1 MPa) that is predetermined in the touch sensor system 1, but the pressure threshold P _T is a host provided outside the touch sensor system 1. More preferably, the value can be changed by the device 11.

  The determination unit 21 provides the determination unit 22 with pressure determination result information indicating a result of determining whether or not the pressure determination condition is satisfied. Further, the determination unit 21 acquires the first capacitance map from the capacitance distribution calculation unit 3 and gives it to the specifying unit 22.

The specifying unit 22 acquires pressure determination result information and a first capacitance map from the determination unit 21. When the pressure determination result information indicates that the pressure determination condition is satisfied, the specifying unit 22 in the first capacitance map,
(I) a first region _{RPEN in} which capacitance is obtained by touch pen input (or input by a user's finger);
(Ii) a second region R _{PALM from} which a capacitance by hand is obtained;
Identify each. Then, the specifying unit 22 gives input region specifying information indicating the result of specifying the region to the replacement unit 23 together with the first capacitance map.

The replacement unit 23 acquires the first capacitance map and the input area specifying information from the specifying unit 22. The replacement unit 23 replaces the value of the capacitance formed in the second region R _PALM in the first capacitance map with a zero value indicating that there is no touch input, and generates a second capacitance map. . The replacement unit 23 gives the second capacitance map to the touch recognition unit 4.

  When the pressure determination result information indicates that the pressure determination condition is not satisfied, the specifying unit 22 does not perform the process of specifying the region in the first capacitance map, The capacity map is given to the replacement unit 23. Further, the replacement unit 23 gives the first capacitance map to the touch recognition unit 4 without generating the second capacitance map.

  Next, specific operations of the specifying unit 22 and the replacement unit 23 will be described in detail below with reference to FIG.

(Operations of the specifying unit 22 and the replacement unit 23)
FIG. 5 is a graph schematically showing a capacitance map on the touch panel 5 and shows a one-dimensional capacitance map on the touch panel 5 for the sake of simplicity. Here, (a) of FIG. 5 shows a first capacitance map after the first region R _PEN and the second region R _PALM are specified by the specifying unit 22, and (b) of FIG. The second capacitance map after the capacitance value included in the second region R _PALM is replaced with a zero value by the replacement unit 23 is shown.

  Consider the sense lines VL1 to VL24 as 24 sense lines. At this time, paying attention to one drive line HL1 crossing the sense lines VL1 to VL24, a total of 24 capacitances formed at the intersections of the sense lines VL1 to VL24 and the drive line HL1 are considered.

Here, about 24 capacitances,
The capacitance at the intersection of the sense line VL1 and the drive line HL1 is C1,
The capacitance at the intersection of the sense line VL2 and the drive line HL1 is C2,
(... Omitted ...)
The capacitance at the intersection of the sense line VL24 and the drive line HL1 is C24,
Is referred to as

  According to the first capacitance map given from the capacitance distribution calculation unit 3 to the manual removal processing unit 2, the capacitances C1 to C24 are distributed as shown in FIG. In FIG. 5A, the horizontal axis represents the number of each sense line from the first sense line VL1 to the 24th sense line VL24, and the vertical axis corresponds to each sense line number. The values of the capacitances C1 to C24 are shown. In addition, the capacitance value on the vertical axis is standardized with the maximum capacitance value of 1 among the capacitances C1 to C24, and is indicated as a unitless value.

  In the first capacitance map shown in FIG. 5A, touch pen input is given to positions corresponding to the sense lines VL4 to VL6 on the touch panel 5, and positions corresponding to the sense lines VL12 to VL22 are displayed. The 1st electrostatic capacitance map obtained when the input by hand is given is illustrated.

Or identifying unit 22, the value of the capacitance C1~C24 corresponding to each sense line VL1~VL24 the touch panel 5 is larger than the value of the predetermined capacitance threshold _{C T,} i.e.,
C _k > C _T (1 ≦ k ≦ 24) (capacitance determination condition)
Whether or not is satisfied is determined.

Here, the value of the capacitance threshold C _T is determined as C _T = 0.15. The capacitance threshold value C _T may be a unique value that is predetermined in the touch sensor system 1, but the capacitance threshold value C _T is the host device 11 provided outside the touch sensor system 1. It is more preferable that the value can be changed by the above.

If the first capacitance maps shown in (a) of FIG. 5, the identifying unit 22, (i) C4-C6, and, the (ii) C12 to C22, larger capacitance threshold _{C T,} The capacitance is determined as a capacitance that satisfies the capacitance determination condition.

Then, the specifying unit 22
(I) Capacitance C4 to C6 as the first capacitance group G1,
(Ii) Capacitance C12 to C22 as the second capacitance group G2,
A series of adjacent capacitance groups satisfying the capacitance determination condition is divided.

  That is, since the capacitances C4, C5, and C6 are capacitances that satisfy the capacitance determination conditions adjacent to each other, they are classified into the first capacitance group G1 as the same group.

  On the other hand, the electrostatic capacity C6 and the electrostatic capacity C12 are both electrostatic capacity satisfying the electrostatic capacity determination condition, but are not adjacent electrostatic capacity and are not classified as the same group. Accordingly, the capacitances C12 to C22 are divided into the second capacitance group G2 as a group different from the first capacitance group G1.

Subsequently, the specifying unit 22
(I) the number N1 of capacitances included in the first capacitance group G1,
(Ii) the number N2 of capacitances included in the second capacitance group G2,
Are respectively calculated, and then the smaller one of the numbers N1 and N2 is specified. That is, the specifying unit 22 performs the number N1 and the number N2 as follows.
N = min (N1, N2)
Is calculated, the smaller one of the number N1 and the number N2 is specified as the number N.

In the case of the electrostatic capacity map shown in FIG. 5A, N1 = 3 and N2 = 11 are calculated.
N = min (N1, N2) = min (3, 11) = 3 = N1
Therefore, the number N1 is specified as a number N smaller than the number N2.

Next, the specifying unit 22 includes a set of sense lines corresponding to the first capacitance group G1 including N1 capacitances, which is the number of smaller capacitances, in the first capacitance map. that is, the sense line VL4～VL6, identifying a first region _{R PEN} capacitance is obtained with the touch pen input.

Further, the specifying unit 22 includes a set of sense lines corresponding to the second capacitance group G2, which includes N2 capacitances, which is the larger number of capacitances, in the first capacitance map, that is, , The sense lines VL12 to VL22 are specified as the second region R _PALM in which the capacitance by hand is obtained.

  In addition, although the case where there are two capacitance groups, the first capacitance group G1 and the second capacitance group G2, is described here, the number of capacitance groups is three. The case where there are two or more can be considered similarly.

That is, among the groups of three or more capacitances, a capacitance group having the smallest number of included capacitances is set as a group corresponding to a region where capacitance by touch pen input is obtained, and What is necessary is just to let the group of an electrostatic capacitance other than that be a group corresponding to 2nd area _| region R _{PALM from} which the electrostatic capacitance by hand was obtained.

The specifying unit 22 generates input region specifying information indicating the result of specifying the first region R _PEN and the second region R _PALM in the first capacitance map, and gives the input region specifying information to the replacement unit 23.

The replacement unit 23 acquires input area specifying information from the specifying unit 22. The replacement unit 23 replaces the values of the capacitances C12 to C22 formed in the second region R _PALM , that is, VL12 to VL22, with zero values indicating no touch input in the first capacitance map, A second capacitance map is generated. Then, the replacement unit 23 gives the second capacitance map to the touch recognition unit 4.

FIG. 5B shows a second capacitance map in the present embodiment. Note that the replacement unit 23 does not perform replacement for the capacitance value formed in other regions other than the second region R _PALM . Accordingly, in the second capacitance map, the values of the capacitances C4 to C6 formed in the first region R _PEN , that is, VL4 to VL6, are determined from the values of the capacitances C4 to C6 in the first capacitance map. It has not changed.

  Here, the description is given using the one-dimensional capacitance map on the touch panel 5, but the determination that the removal processing unit 2 with the hand also includes for the two-dimensional capacitance map on the touch panel 5. When the unit 21, the specifying unit 22, and the replacement unit 23 perform the same operation, it is possible to exclude manual input on the touch panel 5.

(Processing of input detection in touch sensor system 1)
Hereinafter, with reference to FIG. 6, the flow of the input detection process in the touch sensor system 1 will be described. FIG. 6 is a flowchart showing the flow of input detection processing in the touch sensor system 1.

  First, to activate the touch sensor system 1, the power source of the touch sensor system 1 is turned on (step S1) (touch sensor system activation process).

  The driver 7 drives the drive lines HL1 to HLn. The sense amplifier 8 reads, as analog signals, linear sums Y1 to Ym corresponding to (n × m) capacitances C11 to Cnm formed on the touch panel 5 from the sense lines VL1 to VLm. (Step S2) (touch panel driving step).

  The AD converter 9 performs AD conversion on the linear sums Y1 to Ym as analog signals, and supplies the digitized linear sums Y1 to Ym to the capacitance distribution calculation unit 3 (step S3) (linear sum AD). Conversion step).

  The capacitance distribution calculation unit 3 calculates the capacitance distribution in the touch panel 5 based on the digitized linear sums Y1 to Ym. The capacitance distribution calculation unit 3 gives the first capacitance map indicating the capacitance distribution on the touch panel 5 to the determination unit 21 included in the manual removal processing unit 2 (step S4) (first capacitance map generation step) ).

  The determination unit 21 acquires the first capacitance map from the capacitance distribution calculation unit 3, and determines the value of the pressure P applied to the touch panel 5 detected by the pressure sensor 6 as the pressure sensor 6. Get from.

And the determination part 21 determines whether the value of the pressure P applied with respect to the touch panel 5 exceeds predetermined | prescribed pressure threshold value _PT based on the pressure determination conditions (step S5) (pressure conditions) Determination step).

  Subsequently, the determination unit 21 provides the determination unit 22 with pressure determination result information indicating a result of determining whether or not the pressure determination condition is satisfied, together with the first capacitance map.

When the pressure determination condition is satisfied, that is, when P> P _T (YES in step S5), the specifying unit 22 sets the capacitance that satisfies the capacitance determination condition and the capacitance determination condition. based on the number of, in the first capacitance map, identifying a first region R _PEN capacitance is obtained with the touch pen input and a second region R _PALM obtained electrostatic capacitance due Otetsuki (step S6) (region specifying step).

Subsequently, the specifying unit 22 provides input region specifying information indicating the result of specifying the first region R _PEN and the second region R _PALM to the replacement unit 23 together with the first capacitance map.

The replacement unit 23 replaces the value of the capacitance formed in the second region R _PALM in the first capacitance map with a zero value indicating that there is no touch input, and generates a second capacitance map. (Step S7) (Second Capacitance Map Generation Step).

  Subsequently, the replacement unit 23 gives the second capacitance map to the touch recognition unit 4. And the touch recognition part 4 calculates the input coordinate which shows the position of the input given to the touch panel 5 with the touch pen 80 or a user's finger | toe based on the 2nd electrostatic capacitance map (step S8) (input coordinate calculation process) ).

  Subsequently, the touch recognition unit 4 outputs the calculated input coordinates to the host device 11 provided outside the touch sensor system 1 (step S9) (input coordinate output process).

On the other hand, when the pressure determination condition is not satisfied, that is, when P ≦ P _T (NO in step S5), determination unit 21 does not perform the process of specifying the region in the first capacitance map. The first capacitance map is given to the replacement unit 23. Subsequently, the replacement unit 23 gives the first capacitance map to the touch recognition unit 4 without generating the second capacitance map. In this case, the touch recognition unit 4 performs the same processing as steps S8 and S9 based on the first capacitance map.

[Embodiment 2]
An embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, members similar to those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 7 is a functional block diagram illustrating a configuration of a mobile phone 100 (electronic device) as an example of an electronic device including the touch sensor system 1 according to the first embodiment.

  The cellular phone 100 includes a touch sensor system 1, an operation unit 101, a display unit 102, a speaker 103, a microphone 104, a camera 105, a main control unit 106, a RAM (Random Access Memory) 107, and a ROM (Read Only Memory) 108. ing. The above members are connected to each other by a data bus.

  The touch sensor system 1 includes a touch panel 5, a pressure sensor 6, and a capacitance value distribution detection circuit 12.

  The operation unit 101 is a device that accepts various inputs to the mobile phone 100, and is, for example, a keyboard.

  The display unit 102 further includes a display control unit 102a and a display panel 102b. The display control unit 102a displays an image on the display panel 102b in response to a command from the main control unit 106. The display panel 102b displays various images such as an initial screen, a selection screen, and a processing screen in response to a command from the display control unit 102a. Further, the display unit 102 is superimposed on the touch panel 5 or has the touch panel 5 incorporated therein. In addition, when the display part 102 is piled up on the touch panel 5, the display part 102 is corresponded to the display apparatus 52 in Embodiment 1 (refer (b) of FIG. 3).

  The speaker 103 outputs audio data input to the microphone 104 and outputs music data stored in the RAM 107 or the ROM 108. The microphone 104 receives input of audio data by the user. The camera 105 captures a subject in accordance with a user input from the operation unit 101. Data on the subject photographed by the camera 105 is stored in the RAM 107 or the ROM 108.

  The main control unit 106 plays a role of overall control of the operation of the mobile phone 100. The main control unit 106 corresponds to a CPU (Central Processing Unit) in the computer system. The main control unit 106 has a function as the host device 11 in the first embodiment.

  The RAM 107 stores various data generated by the operation of the main control unit 106 in a volatile manner, and serves as a temporary storage unit that functions as a work memory when the main control unit 106 is activated. The ROM 108 is a computer-readable readable recording medium in which data is stored in a nonvolatile manner and the main control unit 106 is operated, and various data used for the control program is recorded.

  In the present embodiment, the mobile phone 100 as an example of an electronic device including the touch sensor system 1 is a mobile phone with a camera or a smartphone, but the electronic device including the touch sensor system 1 is not limited thereto. For example, information processing devices such as a mobile terminal device such as a tablet, a PC monitor, signage, an electronic blackboard, and an information display are also included in the electronic device including the touch sensor system 1.

[Embodiment 3]
The control block (particularly the main control unit 106) of the mobile phone 100 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC) or the like, or using a CPU (Central Processing Unit). It may be realized by software.

  In the latter case, the mobile phone 100 includes a CPU that executes instructions of a program that is software for realizing each function, a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by a computer (or CPU), or A storage device (these are referred to as “recording media”), a RAM (Random Access Memory) that expands the program, and the like are provided. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

[Modification]
The capacitance distribution calculation unit 3, the touch recognition unit 4, the determination unit 21, the specifying unit 22, and the replacement unit 23 included in the touch sensor system 1 of Embodiment 1 may be implemented by an integrated circuit (IC). Therefore, an integrated circuit (for example, a touch panel controller) including the capacitance distribution calculation unit 3, the touch recognition unit 4, the determination unit 21, the specifying unit 22, and the replacement unit 23 in the touch sensor system 1 is also within the technical scope of the present invention. included.

[Summary]
The touch sensor system (1) which concerns on aspect 1 of this invention shows distribution of the value of the said electrostatic capacitance in the touch panel (5) with which several electrostatic capacitances (C11-Cnm) were distributed in matrix form, and the said touch panel. A first capacitance map generation unit (capacitance distribution calculation unit 3) that calculates a first capacitance map, and a coordinate value of a touch input on the touch panel calculated based on the first capacitance map A touch sensor system including a touch recognition unit (4) that outputs to a provided host device (11), wherein the touch sensor system detects a pressure value applied to the touch panel ( 6), the value of the pressure above the pressure sensed by the sensor (P) is determined pressure condition judgment section for greater or not than the value of the pressure threshold (P _T) (determination unit 1) and when the pressure condition determination unit determines that the pressure value is greater than the pressure threshold value, the first capacitance map is caused by an input with a touch pen (80) or a finger. A region specifying unit for specifying a first region (R _PEN ) in which the electrostatic capacitance is distributed and a second region (R _PALM ) in which the electrostatic capacitance generated by the touch input is distributed; A second capacitance map generated by replacing the capacitance value in the second region of the one capacitance map with a zero value indicating a state where there is no touch input is provided to the touch recognition unit. And a capacitance map generation unit.

  According to the above configuration, in the touch sensor system, the first capacitance map indicating the distribution of the plurality of capacitance values distributed in a matrix on the touch panel is calculated by the first capacitance map generation unit. . The first capacitance map is used for calculation in the touch recognition unit to give the coordinate value of the input on the touch panel to the host device provided outside.

  In addition, the touch sensor system includes a pressure sensor that detects a pressure value P applied to the touch panel, a pressure condition determination unit, a region specifying unit, and a second capacitance map generation unit.

The pressure condition determination unit determines whether or not the value of the pressure P detected by the pressure sensor is larger than the value of the pressure threshold value _PT .

When the pressure condition determination unit determines that the pressure value P is greater than the pressure threshold value P _T , the region specifying unit determines whether the electrostatic capacitance generated by the input with the touch pen or the finger in the first capacitance map. The first region R _{PEN in} which the capacitance is distributed and the second region R _PALM in which the capacitance generated by manual input is distributed are specified.

  The second capacitance map generation unit replaces the capacitance value in the second region of the first capacitance map specified by the region specification unit with a zero value indicating that there is no touch input, 2 Capacitance map is generated. Subsequently, the second capacitance map generation unit provides the second capacitance map to the touch recognition unit.

  Therefore, the touch recognition unit includes a second electrostatic capacitance map in which the electrostatic capacitance value in the second region of the first electrostatic capacitance map is replaced with a zero value indicating that there is no touch input. A capacity map is given. The touch recognition unit calculates the coordinate value of the touch input on the touch panel based on the second capacitance map instead of the first capacitance map, and gives the coordinate value of the touch input to the host device.

  For this reason, the coordinate value of the touch input given from the touch recognition unit to the host device is calculated in the touch recognition unit as a coordinate value excluding the influence of the capacitance caused by the touch input.

  Therefore, in the touch sensor system, input to the touch panel by hand is excluded, and malfunction of the touch sensor system is suppressed.

The touch sensor system according to aspect 2 of the present invention is the touch sensor system according to aspect 1, in which the region specifying unit has a capacitance larger than a capacitance threshold value (C _T ) in the first capacitance map. A set of two or more capacitances having the value (first capacitance group G1, second capacitance group G2), and further, a capacitance included from the capacitance set Selecting a set (first capacitance group G1) with the smallest number of and specifying a region in the first capacitance map corresponding to the selected set of capacitances as the first region, It is preferable that an area in the first capacitance map corresponding to a set of capacitances (second capacitance group G2) other than the selected set of capacitances is specified as the second area.

According to the above configuration, in the touch sensor system, the area specifying unit, in the first capacitance map, has a large value of capacitance than the value of the capacitance threshold C _T, 2 or more electrostatic Identify a set of capacities.

  Subsequently, the region specifying unit selects a set having the smallest number of included capacitances from the set of two or more capacitances, and selects a first static corresponding to the set of capacitances. An area in the capacitance map is specified as the first area.

  In addition, the region specifying unit is a capacitance other than the selected capacitance set among the sets of two or more capacitances, that is, a capacitance other than the capacitance set corresponding to the first region. A region in the first capacitance map corresponding to the set of is specified as the second region.

  Accordingly, the region specifying unit specifies the first region as one region where the capacitance generated by the input with the touch pen or the finger is distributed, and the capacitance generated by the touch input is distributed. The second region as the plurality of regions is specified.

  For this reason, by specifying the plurality of second regions, it is possible to effectively exclude the influence due to the electrostatic capacitance caused by the manual input from the coordinate value of the touch input calculated by the touch recognition unit.

  Therefore, in the touch sensor system, input to the touch panel by hand is excluded, and malfunction of the touch sensor system is suppressed.

  Further, in the touch sensor system according to aspect 3 of the present invention, in the above aspect 1 or 2, a plurality of the pressure sensors are provided, and at least one of the plurality of pressure sensors is provided at a corner portion of the touch panel. It is preferable to arrange at a position corresponding to the vicinity.

  According to the above configuration, in the touch sensor system, at least one of the plurality of pressure sensors is disposed at a position corresponding to the vicinity of the corner portion of the touch panel.

  Therefore, by the arrangement of these pressure sensors, the pressure applied to the touch panel can be detected by the pressure sensor in the entire range of the touch panel. Therefore, in the touch sensor system, input to the touch panel by hand is effectively excluded, and malfunction of the touch sensor system is suppressed.

  In the touch sensor system according to aspect 4 of the present invention, in the aspect 3, it is preferable that at least one of the plurality of pressure sensors is disposed at a position corresponding to the vicinity of the center of the touch panel. .

  According to the above configuration, in the touch sensor system, at least one of the plurality of pressure sensors is disposed at a position corresponding to the vicinity of the center of the touch panel.

  Therefore, by the arrangement of these pressure sensors, the pressure applied to the touch panel can be detected by the pressure sensor in the entire range of the touch panel. Therefore, in the touch sensor system, input to the touch panel by hand is effectively excluded, and malfunction of the touch sensor system is suppressed.

  A touch sensor system control method according to aspect 5 of the present invention is a method for controlling a touch sensor system according to any one of aspects 1 to 4, wherein the pressure value detected by the pressure sensor is In the pressure condition determining step for determining whether or not the pressure threshold value is greater than the pressure threshold value, and in the pressure condition determining step, if the pressure value is determined to be greater than the pressure threshold value, the first In the capacitance map, a region that identifies a first region in which capacitance generated by input with a touch pen or a finger is distributed and a second region in which capacitance generated by touch input is distributed A second capacitance map generated by replacing the capacitance value in the specific step and the second region with a zero value indicating a state where there is no touch input is represented by the touch recognition. A second capacitance map generation step of providing to the part, preferably contains a.

  According to the above configuration, the touch sensor system control method excludes touch input from the touch panel as in the touch sensor system according to any one of the first to fourth aspects, and suppresses malfunction of the touch sensor system. Is done.

  Moreover, the integrated circuit which concerns on aspect 6 of this invention is the 1st electrostatic capacitance map production | generation part with which the touch sensor system which concerns on any one of the said aspects 1 to 4 is equipped, a touch recognition part, A pressure condition determination part, The region specifying unit and the second capacitance map generating unit are preferably included.

  Moreover, it is preferable that the electronic device (100) which concerns on aspect 6 of this invention contains the touch sensor system which concerns on any one of the said aspects 1-4.

  In addition, the electronic device according to the seventh aspect of the present invention may be realized by a computer. In this case, the electronic device that causes the electronic device to be realized by the computer by causing the computer to operate as each unit included in the electronic device. These control programs and computer-readable recording media on which the control programs are recorded also fall within the scope of the present invention.

[Additional Notes]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

  The present invention can also be expressed as follows.

  That is, the touch sensor system of the present invention includes a pressure sensor, a capacitive touch panel, and a capacitance distribution detection circuit, and when a pen input or a touch input other than a pen is applied, the pressure applied to the panel is equal to or greater than a threshold value. If there is, the touch input other than the pen is invalidated, and if the pressure applied to the panel is less than the threshold, all touch inputs are validated.

  The present invention can be used for a touch sensor system and an electronic device including the touch sensor system.

DESCRIPTION OF SYMBOLS 1 Touch sensor system 2 Hand removal processing part 3 Capacity distribution calculation part (1st electrostatic capacitance map production | generation part)
4 Touch recognition unit 5 Touch panel 6 Pressure sensor 21 Determination unit (pressure condition determination unit)
22 Specific part (area specific part)
23 Replacement unit (second capacitance map generation unit)
80 Touch pen 100 Mobile phone (electronic equipment)
C11-Cnm, Cxy, C1-C24 Capacitance C _T Capacitance threshold P Pressure P _T Pressure threshold R _PEN 1st region R _PALM 2nd region

Claims (5)

A touch panel in which a plurality of capacitances are distributed in a matrix;
A first capacitance map generation unit that calculates a first capacitance map indicating a distribution of the capacitance values in the touch panel;
A touch recognition system comprising: a touch recognition unit that outputs a coordinate value of a touch input on the touch panel calculated based on the first capacitance map to a host device provided outside;
The touch sensor system is
A pressure sensor for detecting a pressure value applied to the touch panel;
A pressure condition determination unit that determines whether or not a value of the pressure detected by the pressure sensor is larger than a pressure threshold value;
When the pressure condition determination unit determines that the pressure value is larger than the pressure threshold value, the capacitance generated by the input with the touch pen or the finger is distributed in the first capacitance map. An area specifying unit for specifying the first area and the second area in which the capacitance generated by manual input is distributed;
A second capacitance map generated by replacing the capacitance value in the second area of the first capacitance map with a zero value indicating a state where there is no touch input is given to the touch recognition unit. A touch sensor system, further comprising: a second capacitance map generation unit. The region specifying unit specifies a set of two or more capacitances having a capacitance value larger than a capacitance threshold value in the first capacitance map;
Further, from the set of capacitances, a set having the smallest number of included capacitances is selected, and an area in the first capacitance map corresponding to the selected set of capacitances is selected. Identified as the first region,
2. The touch sensor according to claim 1, wherein a region in the first capacitance map corresponding to a set of capacitances other than the selected set of capacitances is specified as the second region. system.   A plurality of the pressure sensors are provided, and at least one of the plurality of pressure sensors is disposed at a position corresponding to the vicinity of a corner portion of the touch panel. The touch sensor system described.   The 1st electrostatic capacitance map production | generation part with which the touch sensor system of any one of Claim 1 to 3 is provided, a touch recognition part, a pressure condition determination part, an area | region specific | specification part, and a 2nd electrostatic capacitance map And an integrated circuit.   An electronic apparatus comprising the touch sensor system according to claim 1.

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