JP2010191797A - Touch panel and mobile terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch panel with improved position detection accuracy. <P>SOLUTION: The touch panel includes: a first electrode having first electrode patterns formed by connecting electrode pieces of a predetermined shape in a first direction and arrayed in a direction crossing the first direction; a second electrode having second electrode patterns formed by connecting electrode pieces of a predetermined shape in a second direction and arrayed in the first direction; and a position detecting means for determining a gravity center position of a detection output indicating an electrostatic capacitance of each of the first electrode patterns, and that indicating an electrostatic capacitance of each of the second electrode patterns, to be output as a position detection result. The shape of the electrode piece is determined so that a difference between areas of the individual electrode pieces concerned, is smaller compared with when the individual electrode piece is a polygon having a plane formed of the same shape, between when the whole individual electrode piece contributes to formation of the electrostatic capacitance corresponding to a target object and when the target object contributes to the formation of the electrostatic capacitance when approaching the middle of the electrode piece belonging to the adjacent two electrode patterns. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a touch panel that provides both an information display function and a position input function, and a portable terminal device equipped with the touch panel.

  The touch panel is configured by stacking transparent sheet-like electrodes for position input so as to cover the display surface of the liquid crystal display unit. In the touch panel, the position where the finger touches is detected based on the change in capacitance caused by the user touching the finger with the above-described sheet-like electrode or by bringing the finger close. This position detection result is linked to designation of an icon displayed by the liquid crystal display unit. Accordingly, it is possible to provide a function of performing an intuitive operation such as starting an application by touching an icon with a finger or the like (see Patent Documents 1 and 2). In recent years, such touch panels are mounted on mobile terminal devices as well as automatic transaction devices of financial institutions.

  The sheet-like electrode provided in the touch panel is configured as shown in FIG. 8, for example. In the example of FIG. 8, an insulating layer is overlaid on an ITO film (Indium Tin Oxide) that provides a ground potential. On this insulating layer, a plurality of X electrode patterns and Y electrode patterns are arranged in the X direction and the Y direction, respectively.

  The X electrode pattern is formed, for example, by connecting a plurality of rhombus patterns shown in white in FIG. 8 in the Y direction. The Y electrode pattern is formed by connecting a plurality of rhombus patterns shown by shading in FIG. 8 in the X direction.

  In the touch panel using the sheet-like electrode as shown in FIG. 8, for example, the detection output as shown in FIG. 9 (a) corresponding to the capacitance when the finger contacts the position indicated by the thick broken line. Is obtained. Note that the numbers in the X-axis direction in FIG. 9A correspond to the numbers of the respective X electrode patterns shown in FIG. The position where the finger is in contact with the touch panel is detected by obtaining the center of gravity position of the distribution of the detection output in the X and Y directions.

  By the way, it is known that in the configuration in which the X electrode pattern and the Y electrode pattern are arranged as shown in FIG. 8, the position of the center of gravity obtained from the detection output does not necessarily match the actual finger position. For example, in FIG. 9B, when the X coordinate of the finger position moves from the center of the X electrode pattern of number 1 to the center position of the X electrode pattern of number 3, the X coordinate of the position detection result of the touch panel is circled. Plotted with marks. As can be seen from FIG. 9B, there is a discrepancy between the ideal position detection result indicated by the broken line and the barycentric position obtained from the detection output. Such inconsistency similarly appears in the position detection result obtained from the detection output from the Y electrode pattern.

  For this reason, conventionally, in order to obtain an accurate position detection result, the error of the gravity center position obtained from the detection output is corrected in consideration of the tendency shown in FIG. 9B.

  On the other hand, in the sheet-like electrode shown in FIG. 8, a rhombus pattern included in the X electrode pattern and a rhombus pattern included in the Y electrode pattern are spread. In such a sheet-like electrode, a detection output sufficient for detecting the position of the center of gravity can be obtained, but the areas of the X electrode pattern and the Y electrode pattern are large, and the parasitic capacitance of the X electrode pattern and the Y electrode pattern is large. For this reason, the response performance of the position detection operation by the touch panel is not sufficient for use as a position input device for operating an icon or the like displayed on the display screen of the mobile terminal device.

  The object of the present invention is to provide a touch panel capable of improving position detection accuracy. It is another object of the present invention to provide a touch panel capable of improving response performance.

  The object of the present invention is to provide a portable terminal device capable of an accurate input operation. It is another object of the present invention to provide a mobile terminal device capable of a quick input operation.

  The above-described object can be achieved by a touch panel disclosed below.

  A touch panel according to a first aspect has a configuration in which a first electrode pattern formed by connecting electrode pieces of a predetermined shape in a first direction is arranged in a second direction intersecting the first direction. A first electrode, a second electrode having a configuration in which second electrode patterns formed by connecting electrode pieces of a predetermined shape in the second direction are arranged in the first direction, and the first electrode are provided. Position detection is performed by obtaining the center of gravity position of the detection output indicating the capacitance of each first electrode pattern and the position of the center of gravity of the detection output indicating the capacitance of each second electrode pattern provided in the second electrode. Position detection means for outputting as a result, and the shape of the electrode pieces provided in the first electrode pattern and the second electrode pattern is such that the whole of the individual electrode pieces has a capacitance corresponding to the object of position detection. The case where it contributes to the formation and the two adjacent electrode pads The difference in the area of the individual electrode pieces contributed to the formation of capacitance when the position detection target object is in the middle of the electrode pieces belonging to the The shape is determined so as to be smaller than that in the case of a polygon in which the plane is spread with the same shape.

  The above-described object can be achieved by a mobile terminal device disclosed below.

  According to a display control instruction, the mobile terminal device according to the second aspect includes a display unit that outputs visual information on a display screen, an electrode sheet that is arranged to cover the display screen, and a position of an object that is close to the electrode sheet. Position specifying means for specifying coordinates shown on the display screen, and display control means for generating a display control instruction for controlling visual information displayed by the display means based on the coordinates obtained by the position specifying means. The electrode sheet has a configuration in which a first electrode pattern formed by connecting electrode pieces having a predetermined shape in the first direction is arranged in a second direction intersecting the first direction. And a second electrode having a configuration in which second electrode patterns formed by connecting electrode pieces of a predetermined shape in the second direction are arranged in the first direction, and the position specifying means includes: The first provided in one electrode Centroid detection means for obtaining a centroid position of a detection output indicating a capacitance of each of the electrode patterns and a centroid position of a detection output indicating the capacitance of each of the second electrode patterns provided in the second electrode; Conversion means for converting the position of the center of gravity into coordinates on the display screen, and the shape of the electrode pieces provided in the first electrode pattern and the second electrode pattern is such that each individual electrode piece is the entire object. In the case of contributing to the formation of the corresponding capacitance, and in the case of contributing to the formation of the capacitance when the object approaches the middle of the electrode pieces belonging to two adjacent electrode patterns, the individual electrode pieces Is determined so that the shape of each of the electrode pieces is smaller than that of a polygon in which a plane is spread in the same shape.

  In the touch panel described above, the position detection accuracy can be improved. Further, the touch panel described above can improve the response performance of position detection.

  In the mobile terminal device described above, an accurate input operation is possible. Moreover, in the portable terminal device described above, it is possible to perform a quick input operation.

It is a figure which shows one Embodiment of a touchscreen. It is explanatory drawing of the position detection in a touch panel. It is a figure explaining the part which contributes to the electrostatic capacitance Cf. It is a figure explaining a gravity center position calculation process. It is a figure which shows another embodiment of an electrode pattern. It is a figure which shows embodiment of a portable terminal device. It is a figure which shows the example of operation of the portable terminal device provided with the touch panel. It is a figure which shows the example of an electrostatic capacitance detection type touch panel. It is a figure explaining the subject of a prior art.

Hereinafter, based on the drawings, an embodiment of the touch panel of the present invention and a mobile terminal device using the touch panel will be described.
(Embodiment 1)
FIG. 1 shows an embodiment of a touch panel.

  The m-column X electrode pattern and the n-row Y electrode pattern provided in the touch panel shown in FIG. 1 are electrode pieces each having a wedge-shaped notch at the center of the four sides of the rhombus. It is formed in connection with.

One end of each of the X electrode patterns is grounded, and the potential appearing at the other end is converted into a digital value by a corresponding analog / digital converter (A / D) 211 _{1 to} 211 _m , and a gravity center position calculation unit ( X) 213 is used for the gravity center position calculation process. Similarly, one end of each Y electrode pattern is grounded, and the potential appearing at the other end is converted into a digital value by a corresponding analog / digital converter (A / D) 212 _{1 to} 212 _{n to} calculate the gravity center position. The center of gravity position is calculated by the part (Y) 214.

In the touch panel shown in FIG. 1, the contacts between the X electrode patterns and the corresponding A / D converters 211 _{1 to} 211 _m are grounded via switches. Similarly, the contacts between the Y electrode patterns and the corresponding A / D converters 212 _{1 to} 212 _n are also grounded via switches.

  FIG. 2 is an explanatory diagram of position detection in the touch panel described above.

In FIG. 2, the A / D converter 211 corresponding to the above-mentioned X electrode pattern detects the potential appearing at the point Px in a state where the Y electrode pattern is grounded via the corresponding switch (SW2), and responds accordingly. Outputs a digital value. At this time, the potential appearing at the point Px is a parasitic capacitance between the electrostatic capacitance Cf generated when the user's finger touches or approaches the touch panel, the parasitic capacitance C1 of the X electrode pattern, and the X electrode pattern and the Y electrode pattern. This corresponds to the charge accumulated in the capacitor C3. In this way, by obtaining the centroid position by the centroid position calculation unit (X) 213 for the digital data indicating the potential obtained for the X electrode pattern of each column, the user's finger is in contact with or close to the touch panel. The X coordinate of the existing position is obtained. Note that the switch (SW2) illustrated in FIG. 2 corresponds to a switch connected to a contact point between each Y electrode pattern illustrated in FIG. 1 and the corresponding A / D converters 212 _{1 to} 212 _n .

Similarly, the potential appearing at the point Py is detected by the A / D converter 212 corresponding to the Y electrode pattern described above with the X electrode pattern grounded via the corresponding switch (SW1), and the corresponding digital signal is detected. The value is output. At this time, the potential appearing at the point Py is a parasitic capacitance between the electrostatic capacitance Cf generated when the user's finger touches or approaches the touch panel, the parasitic capacitance C2 of the Y electrode pattern, and the X electrode pattern and the Y electrode pattern. This corresponds to the charge accumulated in the capacitor C3. As described above, the digital data indicating the potential obtained for the Y electrode pattern of each row is obtained by determining the gravity center position by the gravity center position calculation unit (Y) 214, so that the user's finger is in contact with or close to the touch panel. The Y coordinate of the position is determined. Note that the switch (SW1) shown in FIG. 2 corresponds to a switch connected to the contact point between each X electrode pattern shown in FIG. 1 and the corresponding A / D converters 211 _{1 to} 211 _m .

  That is, in the touch panel shown in FIG. 1, the position detection unit described above is realized by the configuration including the gravity center position calculation unit (X) 213 and the gravity center position calculation unit (Y) 214.

  Here, the size of the capacitance Cf described above and the size of the area of the X electrode pattern in each column and the Y electrode pattern in each row that mainly contributes to the formation of the capacitance Cf with the user's finger. There is a correlation.

  Therefore, by devising the shape of the electrode piece as shown in FIG. 1, the detection output obtained from the electrode pattern including the electrode piece located directly under the position detection target is greatly reduced as will be described later. On the other hand, the detection output obtained from the electrode pattern adjacent to this electrode pattern is maintained. For this reason, the difference between the detection output of the nearest electrode pattern and the detection output of the electrode pattern adjacent thereto is reduced. Therefore, when the object whose position is to be detected comes close to the middle between the two electrode patterns, it is possible to suppress the amount by which the detected center-of-gravity position shifts to the electrode pattern side that includes the closest electrode piece.

  For example, in FIG. 3A, when the position of the finger is deviated from the center position of the X electrode pattern of the (i-1) th column to the i-th column side, a hatched portion is added to the portion that contributes to the formation of the capacitance Cf. Attached is shown. In this case, the electrostatic capacity in which almost one of the electrode pieces included in the X electrode pattern in the (i-1) th row and one part of the electrode piece included in the X electrode pattern in the (i) th row correspond to the finger. It contributes to the formation of Cf.

  In this case, the area of the electrode pieces included in the (X-1) th row X electrode pattern contributing to the formation of the capacitance Cf is 4 sides compared to the case where the conventional rhomboid electrode pieces are employed. It is reduced by the notch provided. For this reason, the detection output obtained when the shape of the electrode piece having the shape shown in FIG. 1 is adopted can be suppressed to be significantly smaller than the detection output obtained with the conventional rhomboid electrode piece. In FIG. 4 (a), the detection output obtained with the conventional rhomboid electrode piece is shown by a dotted bar graph, and the detection output obtained when the shape of the electrode piece shown in FIG. 1 is adopted, Shown as a solid bar graph.

  In this way, by suppressing the detection output of the X electrode pattern of the (i-1) th column, when the position of the finger is closer to the i-1th column than the middle of the i-1th column and the ith column, It is possible to prevent the detection output obtained from the X electrode pattern in the (i-1) th column from being excessively reflected in the position of the center of gravity. For example, the center-of-gravity position where the finger position is more accurately reflected can be obtained from the distribution of the detection output as shown by the thick solid line in FIG. In FIG. 4A, the barycentric position obtained from the detection output distribution described above is indicated by a thin dotted line. Further, in FIG. 4A, the distribution of the detection output when the conventional diamond-shaped electrode piece is adopted is indicated by a thin broken line, and the position of the center of gravity obtained based on the distribution of the detection output is indicated by a one-dot chain line. .

  On the other hand, in FIG. 3B, when the position of the finger is substantially in the middle between the X electrode pattern of the (i−1) th row and the X electrode pattern of the i th row, the portion contributing to the formation of the capacitance Cf Shown with diagonal lines. In this case, a portion having substantially the same area in the i-th row X electrode pattern and the i-th row X electrode pattern contributes to the formation of the capacitance Cf corresponding to the finger.

  In this case, in the electrode pieces included in both X electrode patterns, the decrease in the area of the portion contributing to the formation of the capacitance Cf from the conventional rhombus is the same, and the decrease is small. Therefore, as shown in FIG. 4 (b), the barycentric position obtained from the distribution of detection outputs obtained from the X electrode patterns in the (i-3) th column to the (i + 3) th column is obtained using an electrode pattern having a conventional shape. This coincides with the barycentric position obtained from the distribution of detected outputs. In FIG. 4B, the distribution of the detection output when the electrode piece having the shape shown in FIG. 1 is adopted is indicated by a thick solid line, and the distribution of the detection output obtained using the electrode pattern having the conventional shape is shown. Shown with a thin broken line.

  Further, in FIG. 3C, when the position of the finger is shifted from the center position of the X electrode pattern of the i-th row to the i-1th row side, a hatched portion is added to the portion contributing to the formation of the capacitance Cf. Attached is shown. In this case, a capacitance in which almost one of the electrode pieces included in the X electrode pattern in the i-th row and one part of the electrode piece included in the X electrode pattern in the (i−1) -th row correspond to the finger. It contributes to the formation of Cf.

  In the example of FIG. 3C, the detection output of the X electrode pattern in the i-th column is suppressed, contrary to the example shown in FIG. As a result, when the finger position is closer to the i-th column than the middle of the i-th column and the i-th column, the detection output obtained from the X electrode pattern of the i-th column is excessively reflected in the barycentric position. Can be prevented. For example, the position of the center of gravity in which the finger position is more accurately reflected can be obtained from the distribution of the detection output as shown by the thick solid line in FIG. In FIG. 4C, the barycentric position obtained from the distribution of the detection output described above is indicated by a thin dotted line. Further, in FIG. 4C, the distribution of the detection output when the conventional diamond-shaped electrode piece is adopted is shown by a thin broken line, and the barycentric position obtained based on the distribution of the detection output is shown by a one-dot chain line. .

  Similarly, in the position detection using the Y electrode pattern, the same effect can be obtained by adopting the Y electrode pattern in each row to which the electrode pieces having the shape shown in FIG. 1 are connected. That is, when the finger position is closer to the i-1th row than the middle of the i-1th row and the ith row, the detection output obtained from the Y electrode pattern of the i-1th row is excessively reflected in the center of gravity position. Can be prevented. Further, when the position of the finger is closer to the i-th row than the middle of the i-th row and the i-th row, the detection output obtained from the Y electrode pattern of the i-th row is excessively reflected in the barycentric position. Can be prevented.

  In this way, when an object to be detected is positioned in the middle between two electrode patterns, the detection output obtained from the electrode pattern including the closer electrode piece is the detection output obtained from the other electrode pattern. The tendency to surpass can be suppressed. Therefore, it is possible to reduce an error when obtaining the position of the center of gravity of the distribution of detection outputs and improve the position detection accuracy.

  Moreover, as shown in FIG. 1, the shape of the electrode piece contained in each X electrode pattern and each Y electrode pattern is a shape which provides a notch in four sides of the conventional rhombus. That is, the area of each X electrode pattern and each Y electrode pattern is smaller than that of a conventional touch panel. For this reason, since the parasitic capacitance C1 of the X electrode pattern and the parasitic capacitance C2 of the Y electrode pattern are both reduced, the response performance of the touch panel position detection can be improved.

  In this way, by adopting electrode pieces with a shape that reduces the area of each electrode piece included in the conventional electrode pattern, the position detection accuracy is improved and the position detection response performance is improved. And both. That is, it is possible to realize a touch panel that reacts lightly to the movement of the user's finger and has few position detection errors.

  In addition, the shape of each electrode piece which brings about the effect | action and effect mentioned above is not restricted to the shape shown in FIG. As for the shape of the electrode piece, the difference in the contributing area is spread with the same shape when the entire electrode piece contributes to the formation of the capacitance Cf of the finger and when a part of the electrode piece contributes. Any shape can be used as long as it is smaller than the polygonal shape.

For example, as shown in FIG. 5 (a), it is possible to employ an electrode piece having a rectangular cutout at the center of four sides of the rhombus, or as shown in FIG. 5 (b) It is also possible to employ an electrode piece having a wedge-shaped notch extending inward from the four apex positions.
(Embodiment 2)
FIG. 6 shows an embodiment of a mobile terminal device provided with a touch panel.

  The mobile terminal device shown in FIG. 6 includes a terminal control unit 201, a wireless transmission / reception unit 202, an audio signal processing unit 203, a speaker 204, a microphone 205, a display control unit 206, an input control unit 207, and a touch panel 220.

  The touch panel 220 also serves as a display unit and an operation unit of the mobile terminal device. A liquid crystal display (LCD) 221 of the touch panel 220 presents visual information such as characters, symbols, icons, and images to the user in accordance with instructions from the display control unit 206. The electrode sheet 222 is formed to include an X electrode pattern and a Y electrode pattern as shown in FIG. 1 and an insulating film, and is disposed so as to cover the LCD 221. When an object such as a user's finger approaches the electrode sheet 222, the position where the object is in proximity is an analog / digital (A / D) conversion unit (X) 224, an A / D conversion unit. (Y) 223, detected by the gravity center position calculation unit 225.

The A / D converter (X) 224 described above corresponds to the A / D converters 211 _{1 to} 211 _{m shown} in FIG. The A / D converter (Y) 223 corresponds to the A / D converters 212 _{1 to} 212 _{m shown} in FIG. The center-of-gravity position calculation unit 225 has both functions of the center-of-gravity position calculation unit (X) 213 and the center-of-gravity position calculation unit (Y) 214 shown in FIG. 1, and sets the arrangement interval of the X electrode pattern and the Y electrode pattern. A position detection result representing the position of the object is output as a reference.

  The position detection result is converted into coordinates indicating the position on the display screen of the LCD 221 by the coordinate conversion unit 226 and passed to the terminal control unit 201 via the input control unit 207.

  In the mobile terminal device shown in FIG. 6, the A / D conversion unit (X) 224, the A / D conversion unit (Y) 223, the center-of-gravity position calculation unit 225, and the coordinate conversion unit 226 included in the touch panel 220 are described above. Corresponds to position specifying means. The center-of-gravity position calculation unit 225 corresponds to the center-of-gravity detection unit, and the coordinate conversion unit 226 corresponds to the conversion unit.

  FIG. 7 shows an operation example of the mobile terminal device provided with the touch panel as described above.

  FIG. 7A shows an example of a menu display prompting selection of icons indicating operations such as a call, voice reproduction, document creation, Web connection, and mail.

  In the touch panel 220 including the electrode sheet 222 described above, the shape of the electrode pieces of each electrode pattern provided in the electrode sheet is devised as described in the first embodiment. As a result, the difference between the detection output of the electrode pattern closest to the object and the detection output of the electrode pattern adjacent thereto is reduced. For this reason, even when an object to be position-detected comes close to the middle between the two electrode patterns, the detection error of the centroid position by the centroid position calculator 225 can be suppressed. Accordingly, the coordinates on the display screen corresponding to the closest position of the object to be detected can be obtained by the coordinate conversion unit 226 and can be used for the processing of the display control unit 206 corresponding to the display control means. .

  Further, like the touch panel described in the first embodiment, the parasitic capacitance of each electrode pattern is smaller than that of the conventional touch panel. Therefore, the position of the object close to the touch panel can be quickly detected and reflected on the display by the liquid crystal display 221 corresponding to the display unit via the coordinate conversion unit 226 and the display control unit 206.

  As described above, in the portable terminal device shown in FIG. 6, the accuracy of position detection using the touch panel 220 and the response speed are improved. Therefore, for example, in response to the user's finger approaching the position indicated by the dotted line in FIG. 7A, this position is detected with high accuracy and promptly by the touch panel 220. Then, accurate coordinates on the display screen corresponding to this position are passed to the terminal control unit 201 via the input control unit 207, and are subjected to display control processing such as highlighting a music playback icon.

  As described above, the touch panel 220 quickly and accurately detects the position where the user's finger is in contact with or close to the touch panel 220. Therefore, based on the position input obtained from the touch panel 220, the terminal control unit 201 can reliably detect that the user has performed an operation for selecting the music reproduction icon.

  Thereby, the operativity of a portable terminal device can be improved and a very comfortable interface can be provided to a user.

  The improvement in operability brought about by the touch panel 220 is also useful in the operation on the screen for selecting the music to be reproduced as shown in FIG.

  For example, in response to the user's finger approaching the position indicated by the dotted line in FIG. 7B, the position input obtained from the touch panel 220 is passed to the terminal control unit 201, and the song name corresponding to the detected position Can be subjected to display control processing such as highlighting. And based on the position input obtained from this touch panel 220, the terminal control part 201 can discriminate | determine reliably the music designated as reproduction object by the user.

  Note that the electrode sheet 222 provided in the touch panel 220 illustrated in FIG. 6 is not limited to the one provided with the electrode piece having the shape illustrated in FIG. 1. As for the shape of the electrode piece, the difference in the contributing area is spread with the same shape when the entire electrode piece contributes to the formation of the capacitance Cf of the finger and when a part of the electrode piece contributes. Any shape can be used as long as it is smaller than the polygonal shape. For example, the electrode piece having the shape shown in FIG. 5A can be adopted, and the electrode piece having the shape shown in FIG. 5B can also be adopted.

Regarding the above description, the following items are further disclosed.
(Supplementary note 1) a first electrode having a configuration in which first electrode patterns formed by connecting electrode pieces of a predetermined shape in a first direction are arranged in a second direction intersecting the first direction; ,
A second electrode having a configuration in which second electrode patterns formed by connecting electrode pieces of a predetermined shape in the second direction are arranged in the first direction;
The position of the center of gravity of the detection output indicating the capacitance of each of the first electrode patterns provided on the first electrode and the detection output indicating the capacitance of each of the second electrode patterns provided on the second electrode. A position detecting means for obtaining the position of the center of gravity and outputting as a position detection result;
The shape of the electrode pieces provided in the first electrode pattern and the second electrode pattern is adjacent to the case where each of the individual electrode pieces contributes to the formation of the capacitance corresponding to the object to be position-detected. When the position detection target object approaches the middle of the electrode pieces belonging to two electrode patterns and contributes to the formation of capacitance, the difference in the area of the contributed portions of the individual electrode pieces is A touch panel, wherein the shape of each electrode piece is determined to be smaller than that of a polygon in which a plane is laid out in the same shape.
(Additional remark 2) The external shape of each said electrode piece is a polygon in which a plane is spread in the same shape,
The touch panel according to appendix 1, wherein a cutout is formed symmetrically with respect to the outer shape of the electrode piece with respect to the first direction and the second direction.
(Appendix 3) The external shape of the individual electrode pieces is rhombus,
The touch panel according to appendix 2, wherein a notch is formed at a midpoint position of each side of the rhombus.
(Additional remark 4) The external shape of each said electrode piece is a rhombus,
The touch panel according to appendix 2, wherein a wedge-shaped cutout extending from each vertex position of the rhombus is formed.
(Supplementary Note 5) Display means for outputting visual information on a display screen according to a display control instruction;
An electrode sheet arranged to cover the display screen;
Position specifying means for specifying coordinates indicating the position of an object close to the electrode sheet on the display screen;
Display control means for generating a display control instruction for controlling visual information displayed by the display means based on the coordinates obtained by the position specifying means,
The electrode sheet is
A first electrode having a configuration in which first electrode patterns formed by connecting electrode pieces of a predetermined shape in a first direction are arranged in a second direction intersecting the first direction;
A second electrode having a configuration in which second electrode patterns formed by connecting electrode pieces of a predetermined shape in the second direction are arranged in the first direction;
The position specifying means includes
The center of gravity position of the detection output indicating the capacitance of each of the first electrode patterns provided in the first electrode and the detection indicating the capacitance of each of the second electrode patterns provided in the second electrode Centroid detection means for obtaining an output centroid position;
Conversion means for converting the center of gravity position into coordinates on the display screen,
The shape of the electrode pieces provided in the first electrode pattern and the second electrode pattern is such that the whole of each electrode piece contributes to the formation of a capacitance corresponding to the object, and two adjacent electrodes. When the object approaches the middle of the electrode pieces belonging to the pattern, it contributes to the formation of capacitance, and the difference in the area of the contributed portion of the individual electrode pieces is the shape of the individual electrode pieces. A portable terminal device characterized in that it is determined to be smaller than a case where the plane is a polygon that can be spread in the same shape.
(Additional remark 6) The external shape of each said electrode piece is a polygon by which a plane is spread with the same shape,
6. The portable terminal device according to appendix 5, wherein a cutout is formed symmetrically with respect to the outer shape of the electrode piece with respect to the first direction and the second direction.
(Appendix 7) The external shape of each of the electrode pieces is rhombus,
The mobile terminal device according to appendix 6, wherein a notch is formed at a midpoint position of each side of the rhombus.
(Additional remark 8) The external shape of each said electrode piece is a rhombus,
The portable terminal device according to appendix 6, wherein a wedge-shaped cutout extending from each vertex position of the rhombus is formed.

201 terminal control unit 202 wireless transmission / reception unit 203 audio signal processing unit 204 speaker 205 microphone 206 display control unit 207 input control unit 211 _{1 to} 211 _m , 212 _{1 to} 212 _n analog / digital converter (A / D)
213 Center of gravity position calculation part (X)
214 Center of gravity position calculation unit (Y)
220 Touch Panel 221 Liquid Crystal Display (LCD)
222 Electrode sheet 223 Analog / digital (A / D) converter (Y)
224 Analog / digital (A / D) converter (X)
225 Center of gravity position calculation unit 226 Coordinate conversion unit

JP 2006-268262 A JP-A-8-44493

Claims (5)

A first electrode having a configuration in which first electrode patterns formed by connecting electrode pieces of a predetermined shape in a first direction are arranged in a second direction intersecting the first direction;
A second electrode having a configuration in which second electrode patterns formed by connecting electrode pieces of a predetermined shape in the second direction are arranged in the first direction;
The position of the center of gravity of the detection output indicating the capacitance of each of the first electrode patterns provided on the first electrode and the detection output indicating the capacitance of each of the second electrode patterns provided on the second electrode. A position detecting means for obtaining the position of the center of gravity and outputting as a position detection result;
The shape of the electrode pieces provided in the first electrode pattern and the second electrode pattern is adjacent to the case where each of the individual electrode pieces contributes to the formation of the capacitance corresponding to the object to be position-detected. When the position detection target object approaches the middle of the electrode pieces belonging to two electrode patterns and contributes to the formation of capacitance, the difference in the area of the contributed portions of the individual electrode pieces is A touch panel, wherein the shape of each electrode piece is determined to be smaller than that of a polygon in which a plane is laid out in the same shape. The touch panel according to claim 1,
The outer shape of each of the electrode pieces is a polygon that can be spread with the same shape on a plane,
The touch panel has a shape in which notches are formed symmetrically with respect to the outer shape of the electrode piece with respect to the first direction and the second direction. The touch panel according to claim 2,
The external shape of the individual electrode pieces is rhombus,
A touch panel, wherein a notch is formed at a midpoint position of each side of the rhombus. The touch panel according to claim 2,
The external shape of the individual electrode pieces is rhombus,
A touch panel, wherein a wedge-shaped cutout extending from each vertex position of the rhombus is formed. Display means for outputting visual information on a display screen according to a display control instruction;
An electrode sheet arranged to cover the display screen;
Position specifying means for specifying coordinates indicating the position of an object close to the electrode sheet on the display screen;
Display control means for generating a display control instruction for controlling visual information displayed by the display means based on the coordinates obtained by the position specifying means,
The electrode sheet is
A first electrode having a configuration in which first electrode patterns formed by connecting electrode pieces of a predetermined shape in a first direction are arranged in a second direction intersecting the first direction;
A second electrode having a configuration in which second electrode patterns formed by connecting electrode pieces of a predetermined shape in the second direction are arranged in the first direction;
The position specifying means includes
The center of gravity position of the detection output indicating the capacitance of each of the first electrode patterns provided in the first electrode and the detection indicating the capacitance of each of the second electrode patterns provided in the second electrode Centroid detection means for obtaining an output centroid position;
Conversion means for converting the center of gravity position into coordinates on the display screen,
The shape of the electrode pieces provided in the first electrode pattern and the second electrode pattern is such that the whole of each electrode piece contributes to the formation of a capacitance corresponding to the object, and two adjacent electrodes. When the object approaches the middle of the electrode pieces belonging to the pattern, it contributes to the formation of capacitance, and the difference in the area of the contributed portion of the individual electrode pieces is the shape of the individual electrode pieces. A portable terminal device characterized in that it is determined to be smaller than a case where the plane is a polygon that can be spread in the same shape.

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