JP2019159765A - Touch panel device - Google Patents

Abstract

To provide a touch panel device that achieves both false detection prevention and light touch input.SOLUTION: The touch panel device comprises: touch detection means 20 for measuring the touch capacity to detect the presence/absence and touch coordinates of any touch by an indicator to a touch sensor panel 1 and outputting a touch status between the indicator and the touch sensor panel 1; pressure detection means 30 for detecting the pressure applied to the touch sensor panel 1; touch determination mode switching means 40 for switching a determination condition for an effective touch from the outputs of the touch detection means 20 and the pressure detection means 30; and effective touch determination means 50 for determining whether the touch coordinates outputted by the touch detection means 20 are effective or not based on the effective touch determination condition set by the touch determination mode switching means 40, from the touch status information output by the touch detection means 20 and the pressure information output by the pressure detection means 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a touch panel device, and can be suitably used for an information processing device with a touch input function using a touch sensor panel.

  A touch panel device that detects a touch by an indicator such as a finger and identifies its position coordinate is mounted on a display device and is noted as one of excellent user interface means to replace a mechanical keyboard and mouse of an information processing device. In addition, various types of touch panel devices such as a resistive film type and a capacitance type have been commercialized.

  For example, the projected capacitive method, which is one of the electrostatic capacitance methods, is capable of touching an indicator even when the front side of a touch sensor panel incorporating a plurality of sensors is covered with a protective glass having a thickness of about several millimeters. Has been recognized and has advantages such as excellent robustness, and is used for various touch input devices such as an input unit of a portable communication device, ATM in a financial institution, a car navigation device, etc. (Patent Document 1) .

  However, in a capacitive touch panel device, when a conductor such as a water droplet adheres, a change in capacitance may occur, which may be erroneously detected as a touch operation. In order to avoid this, Patent Document 2 discloses a method in which a touch sensor is provided separately from the function of detecting the capacitance and the touch coordinates obtained when a certain press is generated are validated. Further, in Patent Document 3, the pressure threshold is set large in a state without touch, small after receiving a touch, so that the touch operation is not interrupted even when the pressure becomes weak during the touch operation, A method of returning to a large threshold when a pressing state below a small threshold continues for a certain time (time threshold) or more is disclosed.

JP 2008-134836 A Japanese Patent Laying-Open No. 2015-035206 JP, 2015-207034, A

  Since the conventional touch panel device is configured as described above, there is a problem that it is difficult to allow a light touch while preventing erroneous detection. For example, in the case of the method known in Patent Document 3, if the time threshold is lengthened, false detection is likely to occur. However, if the time threshold is shortened, it becomes difficult to input with a light touch, and it is difficult to set the time threshold optimally.

  The present invention has been made in view of the above-described problems. According to the touch detection situation between the touch sensor panel and the indicator, the use condition of pressure data of the pressure sensor is switched to prevent erroneous detection and lightly. It aims at making touch input compatible.

  The touch panel device according to the present invention is a touch sensor panel composed of a plurality of sensors, and is connected to the touch sensor panel and measures the capacity to detect the presence / absence of touch by the indicator on the touch sensor panel and the touch coordinates. And a touch detection means for outputting a touch status between the indicator and the touch sensor panel, a pressure detection means for detecting a pressure applied to the touch sensor panel by a touch by the indicator, the touch detection means, Touch determination mode switching means for switching a determination condition to be regarded as an effective touch from the output of the press detection means; information on the touch status output by the touch detection means based on the determination condition set by the touch determination mode switching means; The touch detection means outputs from the press information output by the press detection means. An effective touch determination means the touch coordinates to determine whether valid or invalid and, characterized by comprising touch information output means for outputting the touch coordinates the active touch determination means determines that the effective outside.

  According to this invention, in the touch panel device, it is possible to achieve both erroneous detection prevention and light touch input.

It is a block diagram which shows the structure of the touchscreen apparatus which concerns on Embodiment 1-3 of this invention. It is a top view which shows the structure of the touchscreen which concerns on Embodiment 1-3 of this invention. It is sectional drawing which shows the structure of the touchscreen which concerns on Embodiment 1-3 of this invention. It is a flowchart which shows operation | movement of the touchscreen apparatus which concerns on Embodiment 1 and 2 of this invention. It is an example which shows a time change of a press, a capacity | capacitance change, and a touch area. FIG. 2 is a mode transition diagram of a touch determination mode described in FIG. 1. It is a mode transition diagram of the touch determination mode according to Embodiment 2 of the present invention. It is a flowchart which shows operation | movement of the touchscreen apparatus which concerns on Embodiment 3 of this invention. It is a mode transition diagram of the touch determination mode according to Embodiment 3 of the present invention.

Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings.

  Note that the drawings are schematically shown, and the configuration is omitted or simplified as appropriate for the convenience of explanation. In addition, the mutual relationships between the sizes and positions of the configurations and the like shown in different drawings are not necessarily accurately described and can be changed as appropriate.

  Moreover, in the description shown below, the same code | symbol is attached | subjected and shown in the same component, and it is the same also about those names and functions. Therefore, detailed descriptions thereof may be omitted to avoid duplication.

  FIG. 1 is a block diagram showing a configuration of touch panel device 100 according to Embodiment 1 of the present invention. As shown in FIG. 1, the touch panel includes a touch sensor panel 1 and a touch panel controller 2 and is connected to a host device 901.

  The touch sensor panel 1 includes a projected capacitive touch sensor 102 and a capacitive pressure sensor 107. The touch sensor 102 is a capacitance detection sensor that forms a capacitance with an indicator such as a finger and can detect a change in the capacitance. The pressure sensor 107 is a sensor that can detect a pressure on the touch surface of the touch sensor panel 1, for example, a pressure from the indicator to the touch surface as a change in capacitance. In the following description, the touch surface of the touch sensor panel 1 is described as only “touch surface”.

  In FIG. 1, the touch sensor panel 1 is configured to include a pressure sensor 107. That is, the pressure sensor 107 is configured only by the components of the touch sensor panel 1, but the pressure sensor 107 according to the first embodiment is not limited to this. For example, the pressure sensor 107 may not be included in the touch sensor panel 1 or may be configured across components other than the touch sensor panel 1 as described below.

  The touch panel controller 2 detects (calculates) touch coordinates indicating the position where the indicator touches the touch surface based on the change in capacitance detected by the touch sensor 102, and detects the electrostatic capacitance detected by the pressure sensor 107. The pressing pressure of the indicator is detected based on the change in capacity. Then, the touch panel controller 2 performs control to generate information including the detection result and the presence / absence of touch as touch information regarding the touch of the indicator on the touch surface, and control to output the generated touch information. Control for generating touch information includes generating touch information and stopping generation of touch information. Control for outputting touch information includes outputting touch information and outputting touch information. Including stopping.

  The touch panel controller 2 is connected to the host device 901 via a connection element 902 such as a connector or a cable, and can generate generated touch information and the like to the host device 901. For communication between the touch panel controller 2 and the host device 901, for example, USB (Universal Serial Bus), I2C (Inter-Integrated Circuit), UART (Universal Asynchronous Receiver Transmitter), or the like is used.

  FIG. 2 is a plan view of the configuration of the touch panel according to the first embodiment as viewed from the touch surface, and FIG. 3 is a cross-sectional view of the configuration. 2 and 3, not only the touch sensor panel 1 and the touch panel controller 2, but also a flexible substrate 5 that electrically connects the touch sensor panel 1 and the touch panel controller 2 (hereinafter referred to as “FPC 5”). Is shown. FIG. 3 shows a liquid crystal module 8 included in a liquid crystal display (LCD), which is a display device in which the touch sensor panel 1 is attached to the display surface side and integrated.

  2 and 3 includes an FPC 5, a shield layer 105, an insulating layer 106, and a pressure sensor electrode 107a in addition to the touch sensor panel 1 and the touch panel controller 2. The touch sensor panel 1 includes a transparent substrate 101, a plurality of X sensors 102 a and a plurality of Y sensors 102 b, and an insulating layer 104. The touch panel controller 2 includes a capacitance detection unit 201.

  Among these configurations, the plurality of X sensors 102a and the plurality of Y sensors 102b constitute the touch sensor 102 of FIG. Further, as will be described later, the pressure sensor electrode 107a and the metal frame 801 of the liquid crystal module 8 constitute the pressure sensor 107 of FIG.

  The touch sensor panel 1 incorporates a plurality of X sensors 102a and a plurality of Y sensors 102b as matrix sensors. The touch sensor panel 1 of FIG. 2 includes a plurality of X sensors 102a extending in the vertical direction and arranged in the horizontal direction as sensors for detecting a touch on the touch surface, and extending in the horizontal direction and extending in the vertical direction. And a plurality of Y sensors 102b arranged side by side. That is, the plurality of X sensors 102a and the plurality of Y sensors 102b are arranged as wirings orthogonal to each other.

  2 and 3, for the sake of simplicity, the number of the plurality of X sensors 102a and the plurality of Y sensors 102b is reduced, and the four X sensors 102a with X0 to X3 are attached. The four Y sensors 102b to which Y3 are attached are illustrated. Hereinafter, when the X sensor 102a and the Y sensor 102b are not distinguished, they will be described as “sensor 102a” and “sensor 102b”.

  As shown in FIG. 3, the plurality of sensors 102 a and 102 b are disposed on the touch surface side of the transparent substrate 101 such as a film or glass in a state where each of the sensors 102 a and 102 b is covered with the insulating layer 104. A self-capacitance Cg, which is a parasitic capacitance, is formed between each of the plurality of sensors 102a and 102b and the counter electrode in the liquid crystal module 8, and a mutual capacitance Cm between the X sensor 102a and the Y sensor 102b. Is formed.

  In the plan view of FIG. 2, an area that can be detected by the touch sensor 102 including the plurality of sensors 102a and 102b in the touch surface is referred to as a “detectable area 102c” and will be described below. A pressure sensor electrode 107a indicated by a two-dot chain line, and a shield layer 105 and an insulating layer 106 indicated by a one-dot chain line are provided in an outer peripheral region surrounding the detectable area 102c.

  In the cross-sectional view of FIG. 3, the shield layer 105 is disposed on the surface of the transparent substrate 101 opposite to the touch surface. As viewed from the surface opposite to the touch surface, the insulating layer 106 is disposed on the shield layer 105, and the pressure sensor electrode 107 a is disposed on the insulating layer 106.

  The shield layer 105 is a shield electrode containing a conductive material, for example. The shield layer 105 is disposed between the touch surface and the pressure sensor 107 so as to overlap at least a part of the pressure sensor 107 when viewed from the touch surface. In the example of FIGS. 2 and 3, the area of the shield layer 105 is larger than the area of the pressure sensor electrode 107 a constituting the pressure sensor 107 and smaller than the metal frame 801 constituting the pressure sensor 107. For this reason, the shield layer 105 is overlapped with a part of the pressure sensor 107. In the case where the pressure sensor 107 is composed of components having an area smaller than the area of the shield layer 105 instead of the metal frame 801, the shield layer 105 is disposed so as to overlap with the entire pressure sensor 107. The

  As will be described later, the shield layer 105 is configured to output an AC signal having the same phase as the GND (ground potential), the DC power supply, or the capacitance detection excitation signal by the capacitance detection unit 201 of the touch panel controller 2. It is connected to a power supply to reduce impedance. The shield layer 105 configured in this way has, for example, electric lines of force and, therefore, parasitic capacitance (capacitance) formed between the pressure sensor and a dielectric outside the touch panel such as an indicator and a high dielectric substance. It can be suppressed or blocked.

  The FPC 5 electrically connects the plurality of sensors 102a and 102b on the touch sensor panel 1 side, the shield layer 105, and the pressure sensor electrode 107a to the capacitance detection means 201 on the touch panel controller 2 side. For example, the FPC 5 is pressure-bonded to the components on the touch sensor panel 1 side using an anisotropic conductive film (ACF) and is connected to the components on the touch panel controller 2 side using a connector or the like. The By this connection, wirings 501, 502, and 503 are formed.

  The capacitance detection means 201 is connected to the plurality of sensors 102 a and 102 b through the wiring 501, connected to the shield layer 105 through the wiring 502, and connected to the pressing sensor electrode 107 a through the wiring 503.

  On the opposite side of the touch surface of the touch sensor panel 1, a liquid crystal module 8 for displaying an image is disposed. The liquid crystal module 8 includes a liquid crystal panel 802, a backlight 803 composed of an LED (Light Emitting Diode), a light guide plate, an optical film, and the like, and a metal frame 801 covering these.

  The liquid crystal module 8 is bonded to the touch sensor panel 1 with a double-sided tape 6. This double-sided tape 6 has a relatively high cushioning property, and the gap between the pressure sensor electrode 107a and the metal frame 801 can be elastically deformed to such a degree that it can be sufficiently varied by the pressure on the touch surface. It has become.

  The touch panel controller 2 shown in FIG. 1 includes a capacitance detection unit 201 that detects a capacitance value such as the touch sensor 102 including a plurality of sensors 102a and 102b. The capacitance detection unit 201 includes an excitation signal. A generation circuit, an integration amplifier, a sample & hold circuit, an A / D converter, and the like. Further, the touch panel controller 2 is provided with a control calculation unit 108 that inputs the capacitance values of the touch sensor 102 and the pressure sensor 107 output from the capacitance detection unit 201 and calculates touch coordinates output to the host device 901. Have. The control calculation unit 108 includes a touch detection unit 20, a press detection unit 30, a touch determination mode switching unit 40, and an effective touch determination unit 50, and further includes a touch information output unit 60 that outputs touch coordinates to the host device 901. .

  For the touch detection in the touch detection means 20, for example, a well-known method disclosed in Japanese Patent Application Laid-Open No. 2010-191778 may be used, and detailed description thereof is omitted here.

  Next, capacity detection of the pressure sensor 107 will be described. As a capacitance related to the pressure sensor 107, a capacitance to be measured by the capacitance detection unit 201 is a coupling capacitance composed of the pressure sensor electrode 107a and the metal frame 801.

  In the present embodiment, as a method for detecting the coupling capacity of the press sensor 107, a charging resistor and a coupling capacity (press sensor capacity) are connected in series as known in Japanese Patent Application Laid-Open No. 2010-217967 and the time constant is measured. Thus, the method of detecting the capacitance is employed, the metal frame 801 is at the ground potential, and the pressing sensor electrode 107a is connected to the capacitance detecting means 201 via the wiring 503. Further, the shield layer 105 is also connected to the capacitance detecting means 201 via the wiring 502, and when measuring the coupling capacitance of the pressure sensor 107, the measurement excitation signal is applied not only to the pressure sensor electrode 107a but also to the shield layer 105. Is applied, the influence of the drive signal of the liquid crystal panel 802 on the measurement of the coupling capacitance can be reduced.

  Next, the configuration of the control calculation means 108 in the touch panel controller 2 shown in FIG. 1 will be described in detail. As described above, the control calculation unit 108 receives the capacitance measurement result of the capacitance detection unit 201, detects the presence / absence of the touch by the indicator and the touch coordinates, and changes the capacitance, touch area data, and the like. Effective from the touch detection means 20 that outputs the touch status, the press detection means 30 that detects the press of the pressure sensor 107, the touch detection result of the touch detection means 20, and the capacitance value output of the press sensor of the capacitance detection means 201. Touch output from the touch detection unit 20 based on the touch determination mode switching unit 40 that switches the determination mode to be regarded as a touch, the capacitance value of the pressing sensor output from the capacitance detection unit 201, and the determination mode of the touch determination mode switching unit 40. The effective touch determination unit 50 that determines whether or not the coordinates are valid, and the touch that the effective touch determination unit 50 determines to be valid. It includes a touch information output means 60 for outputting the coordinates to an external host apparatus.

  Next, the operation of the touch panel device 100 will be described. FIG. 4 is a flowchart showing the operation of the touch panel device 100, and the touch panel device 100 repeatedly performs the processing of this figure. FIG. 5 is a diagram showing temporal changes in pressure, capacitance change (value of the sensor that has the largest capacitance change) and touch area (value of the detected touch having the maximum area). It is.

  Here, the operation of the touch panel device 100 will be described in detail with reference to FIGS. 4 and 5. In FIG. 5A, reference symbol THp is a threshold value for pressing, and it is considered that there is a touch when the threshold value THp is greater than or equal to the threshold value THp (hereinafter, the threshold value THp is simply referred to as “THp”). Also, in FIG. 5B, symbol THc is a threshold value for capacity change, and it is considered that there is a touch when the threshold value THc is equal to or greater than the threshold value THc (hereinafter, the threshold value THc is simply referred to as “THc”). Further, in FIG. 5C, symbol THa is a threshold value for the touch area, and the area of the finger or touch pen as the indicator is usually less than a certain value, so that it is regarded as an abnormal touch situation when it is greater than or equal to the threshold value THa. , The threshold value THa is simply referred to as “THa”). When no touch is detected, the touch area is set to 0 for convenience. Symbols t1 to t6 indicate the time when any one of the values of pressure, capacitance change, and touch area crosses the threshold value, and the smaller the subscript value after the time t, the more the past time. In the present embodiment, the numerical value after “+” after the subscript after the time t is represented by the number of repetitions of the process of FIG. 4, for example, after the process of FIG. 4 is executed at the time t2. The time is time t2 + 1, and the processing in FIG. 4 is executed again. Hereinafter, the operation of the touch panel device 100 will be described in more detail with reference to the drawings (FIGS. 1 and 4).

  In FIG. 1, first, the capacitance detection means 201 performs capacitance measurement (step SA1), and detects a touch by obtaining a capacitance change from the capacitance value and the capacitance value in the state where there is no indicator. (Step SA2), touch information is obtained. The touch information is a touch coordinate calculated when it is determined that there is a touch and a touch result, and includes an ID number for specifying a touch point. Steps SA1 and SA2 indicate the process in FIG. The same applies to step SA3 to step SA7.

  In the present embodiment, as described above, the touch area is included in the touch information as the touch state. For the touch detection, for example, a known method disclosed in JP 2010-191778 A is used. As a method for measuring the area of the touch, a relatively easy method is to use a sensor located near the touch coordinates that counts a certain amount of capacitance change and sets the number as the touch area. Conceivable. And the press detection means 30 of FIG. 1 detects the press of the press sensor 107 (step SA3). This detection is performed, for example, by a known method described in JP 2010-217967 A, Patent Document 2, and Patent Document 3.

Thereafter, the touch determination mode switching means 40 switches the effective touch determination mode from the touch information and the press information (selects determination mode 1 or 2) (step SA4). In this embodiment, as shown in FIG. 6, the effective touch determination modes are the following determination mode 1 and determination mode 2. Among these two conditions, the determination mode 1 is a strict condition that suppresses erroneous detection, and the determination mode 2 is a condition that allows a gentle touch input. The conditions under which touch is valid in the state of determination mode 1 or determination mode 2 are shown below.
Judgment mode 1: Press is greater than THp and touch area is less than THa Judgment mode 2: Touch area is less than THa

The touch determination mode switching means 40 is set to the determination mode 1 immediately after the power is turned on, and in this embodiment, as shown in FIG. 6, between the determination modes 1 and 2 according to the following transition conditions (transition conditions of the determination mode). Switch the judgment mode with.
Transition condition 1: If the determination mode 1 is used, the touch area is less than THa, and it is determined that the touch is valid in the previous step SA5, the mode is switched to the determination mode 2.
Transition condition 2: If determination mode 2 is being used and the capacity change is less than THc continues for a certain time (this certain time is defined as a time threshold value THt) or the touch area is greater than THa. , Switch to determination mode 1.

  Here, the condition “the touch area is greater than or equal to THa” in the transition condition 2 clearly indicates an abnormal touch situation (occurrence of a capacity change that is not an appropriate touch operation with a finger or the like), and captures a state in which erroneous detection is likely to occur. It is set for the purpose. As a result, regardless of the value of the time threshold THt, if the possibility of erroneous detection is high, the mode is immediately switched from the loose determination mode (determination mode 2) to the strict determination mode (determination mode 1), and erroneous detection is performed. It becomes possible to prevent. Conversely, the time threshold value THt can be set to a large value while suppressing erroneous detection. (Hereafter, the time threshold value THt is simply referred to as “THt”.)

  Thereafter, the effective touch determination unit 50 uses the determination mode switched by the touch determination mode switching unit 40 in the determination mode 1 or the determination mode 2, or when the switching is not performed, in the previous step SA5 of repetition. Using the same determination mode as that used, it is determined whether or not the touch coordinates output by the touch detection means 20 are valid (step SA5). If it is determined that the touch coordinates are valid (step SA6), the touch information output means 60 outputs the touch coordinates (step SA7).

  Hereinafter, an example in which the temporal change shown in FIG. 5 occurs will be described. FIG. 5 shows a case where water is splashed immediately after a touch operation. As shown in FIG. 5 (b), there are two peaks of capacity change, but the earlier one (first half) is actually In the touch operation of, the slower one (second half) is caused by water. For this reason, the second half pressure is significantly smaller than the first half (see FIG. 5A). It is assumed that the determination mode is initially set to determination mode 1. Also, THt> (time t5−time t4).

  As shown in FIG. 5 (a), the first time the pressure becomes equal to or higher than THp is time t2. At this time, since the touch area is less than THa (see FIG. 5C), the determination mode 1 is established, it is determined that the touch is valid in step SA5, and coordinate output is performed in step SA7. Then, at step SA4 at time t2 + 1 shown in FIG. 5A, since transition condition 1 is satisfied, the touch determination mode switching means 40 switches from determination mode 1 to determination mode 2, and thereafter input with a light touch. Is possible.

  The determination mode 2 is continuously used until immediately before the time t5 when the water is applied, but at the time t5 shown in FIG. 5C, the water applied over a wider range than the finger occupies at the time of touch. As a result, a touch area greater than THa has occurred, and the touch determination mode switching means 40 switches from determination mode 2 to determination mode 1 in step SA4. At this time, since the pressure is less than THp, it is not determined to be an effective touch in step SA5, and touch coordinates are not output. Since the determination mode 1 is not established after the time t5, the touch coordinates are not output even after the time t6 when the touch area is less than THa and the determination mode 2 is established. There is no false detection caused by this.

  As described above, according to the first embodiment, the touch determination mode switching means 40 captures a state in which erroneous detection is likely to occur, and the determination mode for determining whether or not to output coordinates is made strict (determination from determination mode 2). By switching to mode 1, it is possible to prevent erroneous detection while allowing light touch input.

<Modification 1>
In the first embodiment, the determination mode 2 is “the touch area is less than THa”. For example, this is because “the pressure is greater than THp _d and the touch area is less than THa (however, THp _d <THp ) ”May be included. That is,
Judgment mode 1: Press is greater than THp and touch area is less than THa Judgment mode 2: Press is greater than THp _d and touch area is less than THa (however, THp _d <THp)
It is.

<Modification 2>
In addition, the transition condition 2 includes a time threshold condition, but this may be a condition of only a touch area without a time threshold. Furthermore, instead of the touch area, another index value indicating an abnormal touch situation may be used.

<Modification 3>
Further, the touch area is the value of the detected touch having the maximum area, but this may be the area value of the area having the maximum area among the areas having the capacitance change of the touch level. The area of the touch cannot be acquired in a state where the capacitance change of THc or more does not occur, and the effective touch determination mode cannot be switched. This has a capacitance change of THc _d or more (however, THc _d <THc). By switching the effective touch determination mode according to the area as a “region having a capacitance change at the touch level”, the determination mode can be switched earlier, and erroneous detection can be further prevented.

Embodiment 2. FIG.
Next, Embodiment 2 will be described with reference to the drawings. The schematic configuration diagram is FIG. 1 as in the first embodiment, and detailed description thereof is omitted here.

  Next, the operation will be described. The flowchart showing the operation of the touch panel device 100 of the present embodiment is FIG. 4 as in the first embodiment. In this embodiment, an example in which the determination mode is switched according to the touch area will be described.

  First, in the same manner as in the first embodiment, the capacitance detection unit 201 measures the capacitance (step SA1), the touch detection unit 20 performs touch detection (step SA2), and at the same time, the press detection unit 30 performs the press sensor. The pressing of 107 is detected (step SA3). Thereafter, the touch determination mode switching means 40 switches the effective touch determination mode (step SA4). In this embodiment, as shown in FIG. 7, there are two effective touch determination modes (determination mode 1 and determination mode 2) as in the first embodiment.

The touch determination mode switching means 40 is set to the determination mode 1 immediately after the power is turned on, and switches the determination mode according to the following determination mode transition conditions A1 and A2 as shown in FIG. Here, THa> THa _d and THt <THt _d .
Transition condition A1: If the determination mode 1 is being used, the touch area is less than THa, and it is determined that the touch is valid in the previous step SA5, the mode is switched to the determination mode 2.
Transition condition A2: When the determination mode 2 is being used and one of the following conditions (1) to (3) is satisfied, the mode is switched to the determination mode 1.
(1) is less than the touch area THa _d, less than state continues capacitance change is less than THc THt _d or (2) the touch area THa _d above THa, continued state THt more capacitance change is smaller than THc ( 3) Touch area is more than THa

  With this determination mode transition condition, the time threshold when switching from the determination mode 2 to the determination mode 1 becomes a smaller value as the touch area is larger. This may be an illegal touch situation as the touch area is larger. This is because it is preferable to switch to the strict judgment mode 1 as soon as possible.

  The subsequent steps are the same as those in the first embodiment, and the effective touch determination unit 50 determines the validity (step SA5). When the touch coordinates are determined to be valid (step SA6), the touch information output unit 6 outputs the touch coordinates. (Step SA7).

  As described above, according to the second embodiment, the occurrence of erroneous detection can be further suppressed by switching the time threshold according to the touch area.

Embodiment 3 FIG.
Next, Embodiment 3 will be described with reference to the drawings. The schematic configuration diagram is FIG. 1 as in the first embodiment, and detailed description thereof is omitted here.

  Next, the operation will be described. FIG. 8 shows a flowchart showing the operation of the touch panel device 100 of the present embodiment. In the present embodiment, an example will be described in which the presence / absence of adhering matter to the touch sensor panel 1 is determined (water droplet determination) and the determination mode is switched according to the result.

First, in the same manner as steps SA1 to SA2 in the first embodiment, the touch detection unit 2 measures the capacity (step SB1) and performs touch detection (step SB2) according to the procedure. Then, the touch detection unit 20 determines whether or not water droplets are attached to the touch sensor panel 1 by using a known method such as JP 2012-88899 A (step SB3). Thereafter, the pressure detection means 30 detects the capacitance value of the pressure sensor 107 (step SB4), and the touch determination mode switching means 40 switches the effective touch determination mode (step SB5). In this embodiment, as shown in FIG. 9, two effective touch determination modes (determination mode 1 and determination mode 2) are used as in the first embodiment. In step SB5, the touch determination mode switching means 4 Immediately after the power is turned on, the judgment mode 1 is set, and the judgment mode is switched according to the following judgment mode transition conditions B1 and B2.
Transition condition B1: If the determination mode 1 is used, the touch area is less than THa, it is determined that the touch is valid in the previous step SA5, and it is determined in step SB3 that there is no water droplet, the determination mode Switch to 2.
Transition condition B2: When the determination mode 2 is in use and one of the following conditions (1) to (3) is satisfied, the mode is switched to the determination mode 1.
(1) The state in which the capacitance change is less than THc continues for a certain time or longer. (2) The touch area is greater than THa. (3) In step SB3, it is determined that there is a water droplet.

  In this determination mode transition condition, in a state where there is a water drop and erroneous detection is likely to occur, severe determination mode 1 is used, and erroneous detection with a water drop can be suppressed.

  The subsequent steps are the same as steps SA5 to SA7 in the first embodiment, and the effective touch determination unit 5 determines the validity (step SB6). When the touch coordinates are determined to be valid (step SB7), the touch information output unit 6 Outputs the touch coordinates (step SB8).

<Modification 3>
In particular, when specializing in water droplet resistance, the following determination mode transition conditions C1 and C2 may be used instead of the determination mode transition conditions B1 and B2.
Transition condition C1: If the determination mode 1 is being used, it is determined that the touch is valid at the previous repeated step SA5, and it is determined at step SB3 that there is no water droplet, the mode is switched to the determination mode 2.
Transition condition C2: When the determination mode 2 is being used and the following condition (1) or (2) is satisfied, the mode is switched to the determination mode 1.
(1) The state where the capacity change is less than THc continues for a certain time or longer. (2) In step SB3, it is determined that there is a water droplet.

  As described above, according to the third embodiment, it is possible to suppress the occurrence of erroneous detection due to the adhesion of water by switching the determination mode based on the result of the water droplet determination.

  In the third embodiment, the water droplet determination is used for the determination of the deposit on the touch sensor panel. However, this may be performed by using a determination method for other deposits such as oil or a combination thereof. May be.

  In the first to third embodiments described above, a variable-capacity pressure sensor whose capacitance is variable according to the pressure applied by the indicator is used as the pressure sensor. However, the type of pressure sensor is limited to this. There is no need, for example, a variable resistance pressure sensor whose resistance value is variable according to the pressure may be adopted.

DESCRIPTION OF SYMBOLS 1 Touch sensor panel 2 Touch panel controller 20 Touch detection means 30 Press detection means 40 Touch determination mode switching means 50 Effective touch determination means 60 Touch information output means 100 Touch panel device 102 Touch sensor 107 Press sensor 108 Control calculation means 201 Capacitance detection means

Claims (4)

A touch sensor panel composed of a plurality of sensors;
Touch detection that is connected to the touch sensor panel, measures the capacity, detects the presence or absence of touch by the indicator on the touch sensor panel and the touch coordinates, and outputs the touch status between the indicator and the touch sensor panel. Means,
Pressure detecting means for detecting pressure applied to the touch sensor panel by touching the indicator;
Touch determination mode switching means for switching a determination condition to be regarded as an effective touch from the outputs of the touch detection means and the pressure detection means;
Based on the determination condition set by the touch determination mode switching unit, the touch output by the touch detection unit from the touch status information output by the touch detection unit and the press information output by the press detection unit. Valid touch determination means for determining whether the coordinates are valid or invalid;
A touch panel device comprising touch information output means for outputting the touch coordinates determined to be valid by the valid touch determination means to the outside.   2. The touch panel device according to claim 1, wherein the touch determination mode switching unit switches a threshold value related to the pressure or whether to apply the pressure as a condition.   The touch detection unit outputs a touch area between the indicator and the touch sensor panel as the touch status information to the touch determination mode switching unit, and the touch determination mode switching unit determines the size of the touch area. The touch panel device according to claim 1, wherein the touch determination mode is switched accordingly.   The touch detection unit performs an adhering matter determination, and outputs an adhering matter determination result as touch state information to the touch determination mode switching unit. The touch determination mode switching unit is set based on the adhering matter determination result. The touch panel device according to claim 1, wherein the effective touch determination condition is switched.