JP2011232928A - Input device and display device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an input device capable of reducing the occurrence of ghosting, and a display device provided with the same.SOLUTION: An input device 1 comprises: a substrate 10; detection electrode patterns 20 provided on the substrate 10 having multiple detection electrodes 21 and connection portions 22 which electrically connect the adjacent detection electrodes 21 to each other; wiring conductors 30 which are electrically connected to one end 20of the detection electrode patterns 20 and are provided on the substrate 10; and a driver 40 which includes a capacity measurement portion 42 for measuring capacity generated in the detection electrodes 21 and a coordinate calculation portion 43 for calculating an input coordinate based on the capacity measured by the capacity measurement portion 42 and is electrically connected to the wiring conductors 30. The area of each of the multiple detection electrodes becomes smaller gradually from the one end 20of the detection electrode patterns to the other end 20of the detection electrode patterns in a planar view.

Description

  The present invention relates to an input device that detects a position where a user performs an input operation as an input position, and a display device including the same.

  Conventionally, an input device represented by a capacitive touch panel employs a so-called line scan method for measuring a capacitance generated in a detection electrode for each detection electrode pattern (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 8-179871

  However, in an input device that employs a line scan method, if a conductor such as a finger or pen approaches or touches multiple locations at the same time (so-called multi-touch), the position of the input coordinates cannot be determined, and it is mistaken that the input touches a different position. A problem called so-called ghost occurs.

  The present invention has been made in view of the above problems, and an object thereof is to reduce the occurrence of ghosts.

  The input device of the present invention includes a base, a plurality of detection electrodes and a connection portion that electrically connects the adjacent detection electrodes, and a detection electrode pattern provided on the base, and the detection electrode pattern An input coordinate is calculated based on a wiring conductor that is electrically connected to one end and provided on the substrate, a capacitance measuring unit that measures a capacitance generated in the detection electrode, and a capacitance measured by the capacitance measuring unit. A driver that is electrically connected to the wiring conductor, and in plan view, the area of each of the plurality of detection electrodes is detected from the one end of the detection electrode pattern. The size gradually decreases toward the other end of the electrode pattern.

  The input device of the present invention can reduce the occurrence of ghosts.

It is a top view which shows an example of the input device in the 1st Embodiment of this invention. It is the figure which expanded R part shown in FIG. (A) is sectional drawing which followed II of FIG. (B) is sectional drawing which followed II-II of FIG. FIG. 2 is an equivalent circuit diagram illustrating the input device of FIG. 1. It is a flowchart which shows operation | movement of the input device of FIG. In the conventional input device, it is a figure which shows the magnitude | size of the capacity | capacitance measured when a user brings a conductor close to or in contact with an input region. In the input device of FIG. 1, it is a figure which shows the magnitude | size of the capacity | capacitance measured when a user brings a conductor close to or in contact with an input region. In the input device of FIG. 1, it is a figure which shows the magnitude | size of the capacity | capacitance measured when a user brings a conductor close to or in contact with an input region. It is sectional drawing which shows the display apparatus provided with the input device of FIG. It is a top view which shows an example of the input device in the 2nd Embodiment of this invention. It is the figure which expanded R1 part shown in FIG. FIG. 11 is a modified example of the input device in FIG. 10, and is an enlarged plan view showing detection electrodes. It is a top view which shows an example of the input device in the 3rd Embodiment of this invention. It is an enlarged plan view which shows the principal part of the input device of FIG.

[Embodiment 1]
First, an input device 1 according to a first embodiment of the present invention will be described with reference to FIGS. Here, the input device 1 is a capacitive touch panel. Further, the input device 1 employs a so-called line scan method when calculating input coordinates.

As shown in FIG. 1, the input device 1 includes an input area E _I for inputting information by a user approaching or touching a conductor such as a finger or a pen, and a non-input area E _I located outside the input area E _I. And an input area _EO . The non-input region E _O has an external conduction region E _G connected flexible printed circuit board F and electrically.

  The input device 1 includes a base body 10, a detection electrode pattern 20, a wiring conductor 30, and a driver 40.

The substrate 10 has a role of supporting the detection electrode pattern 20 and the wiring conductor 30. The base 10 has a first main surface 10a and a second main surface 10b located on the opposite side of the first main surface 10a. Here, the second main surface 10b of the base 10 corresponding to the input area E _I is a surface that the user approaches or directly contacts with a conductor such as a finger or a pen (hereinafter simply referred to as “conductor”). As shown in FIG. 1, the planar view shape of the base body 10 is, for example, a rectangular shape, but is not limited thereto and is arbitrary. Examples of the material of the base 10 include insulating and translucent materials, such as glass and plastic. Here, translucency means having transparency to visible light.

The detection electrode pattern 20 includes a plurality of detection electrodes 21 and a plurality of connection portions 22. Detection electrode pattern 20 is provided on the first major surface 10a of the substrate 10 corresponding to the input region E _I, it is arranged along the X and Y directions. Hereinafter, the detection electrode pattern 20 that detects input coordinates in the X direction is referred to as “X detection electrode pattern 20X”, and the detection electrode pattern 20 that detects input coordinates in the Y direction is referred to as “Y detection electrode pattern 20Y”.

  Examples of the material of the detection electrode pattern 20 include those having translucency and conductivity. As what has translucency and electroconductivity, ITO (Indium Tin Oxide: indium tin oxide), IZO (Indium Zinc Oxide: indium zinc oxide), ATO (Antimony Tin Oxide: antimony tin oxide), Examples thereof include tin oxide and zinc oxide.

  Examples of the method for forming the detection electrode pattern 20 include the following methods. First, for example, ITO is formed as a film on the first main surface 10a of the substrate 10 by sputtering, vapor deposition, or chemical vapor deposition. A photosensitive resin is applied to the surface of the ITO film, and a desired pattern is formed on the photosensitive resin by performing exposure processing and development processing on the applied photosensitive resin. Next, the ITO film is etched into a desired shape by etching the ITO film with a chemical solution. Then, the detection electrode pattern 20 is formed by removing the photosensitive resin provided on the surface of the ITO film.

The X detection electrode pattern 20X includes a plurality of X detection electrodes 21X and a plurality of X connection portions 22X. The plurality of X detection electrode patterns 20X are arranged along the Y direction. Further, in the present embodiment, I X detection electrode patterns 20X are arranged like an X detection electrode pattern 20X ₁ , an X detection electrode pattern 20X ₂ ,... X detection electrode pattern 20X _I.

The X detection electrode 21 </ b> X has a function of forming a ground and a capacitor and a conductor and a capacitor. The X detection electrodes 21X are arranged in the X direction and the Y direction with a predetermined interval. Further, the adjacent X detection electrodes 21X are electrically connected to each other by the X connection portion 22X. Further, the X detection electrode 21X has, for example, a rhombus shape in plan view, but is not limited thereto and is arbitrary. As shown in FIG. 4, when a voltage is applied to the X detection electrode 21X, charges are accumulated in the X detection electrode 21X, and a capacitor _CPX is generated between the X detection electrode 21X and the ground. In FIG. 4, the number of X detection electrode patterns 20 </ b> X is one and the number of X detection electrodes 21 </ b> X is three for simplification of description.

As shown in FIGS. 1 and 2, the area of the X detection electrode 21X is a plan view, is sequentially decreased from one end 20 _S of the X sensing electrode pattern 20X the wiring conductor 30 is connected toward the other end 20 _F ing. That is, as one proceeds from one end 20 _S of the X electrode 20X in the X direction, the area of the X detection electrode 21X is small.

When the area of the X detection electrodes 21X decreases, the magnitude of the capacitance _{C PX} generated in the X detection electrode 21X is small. That is, as shown in FIG. 4, the X sensing electrode pattern 20X, capacitance _{C PX1} generated in X detection electrodes 21X located at one end portion 20 _S side, the X sensing electrodes 21X located at the other end portion 20 _F side It becomes larger than the generated capacitances C _PX2 and C _PX3 . Similarly, the capacitance C _PX2 generated at the X detection electrode 21X is larger than the capacitance C _PX3 generated at the X detection electrode 21X.

  The Y detection electrode pattern 20Y has a plurality of Y detection electrodes 21Y and a plurality of Y connection portions 22Y.

The Y detection electrode pattern 20Y has a plurality of Y detection electrodes 21Y and a plurality of Y connection portions 22Y. The plurality of Y detection electrode patterns 20Y are arranged along the X direction. Further, in the present embodiment, J Y detection electrode patterns 20Y are arranged in the X direction as in the Y detection electrode pattern 20Y ₁ , the Y detection electrode pattern 20Y ₂ ,... Y detection electrode pattern 20Y _I. Has been.

Similar to the X detection electrode 21X, the Y detection electrode 21Y has a function of forming a capacitance with the ground and forming a conductor and a capacitance. The Y detection electrodes 21Y are arranged in the X direction and the Y direction at a predetermined interval. Adjacent Y detection electrodes 21Y are electrically connected to each other by a Y connection portion 22Y. The Y detection electrode 21Y has, for example, a rhombus shape in plan view, but is not limited thereto and is arbitrary. Further, as shown in FIG. 4, when a voltage is applied to the Y detection electrode 21Y, electric charges are accumulated in the capacitor _CPY between the Y detection electrode 21Y and the ground. In FIG. 4, for simplification of description, the number of Y detection electrode patterns 20Y is one, and the number of Y detection electrodes 21Y is three.

As shown in FIGS. 1 and 2, the area of the Y detection electrode 21 </ b> Y gradually decreases from one end 20 _S to the other end 20 _F of the Y detection electrode pattern 20 </ b> Y to which the wiring conductor 30 is connected in plan view. ing. That is, as one proceeds from one end 20 _S of the Y detection electrodes 21Y in the Y direction, the area of the Y detection electrodes 21Y is smaller.

When the area of the Y detection electrodes 21Y decreases, the magnitude of the capacitance _{C PY} occurring this Y detection electrodes 21Y becomes small. That is, as shown in FIG. 4, the Y detection electrode patterns 20Y, capacitance _{C PY1} occurring Y detection electrodes 21Y located at one end portion 20 _S side, the Y detection electrodes 21Y located at the other end portion 20 _F side The generated capacitances C _PY2 and C _PY3 become larger. Similarly, the capacitance C _PY2 generated at the Y detection electrode 21Y is larger than the capacitance C _PY3 generated at the Y detection electrode 21Y.

  Further, the X detection electrode pattern 20X and the Y detection electrode pattern 20Y intersect each other in plan view. Specifically, an insulating member 20A is interposed at a portion where the X detection electrode pattern 20X and the Y detection electrode pattern 20Y intersect. The X detection electrode pattern 20X and the Y detection electrode pattern 20Y are electrically insulated by the insulating member 20A. Examples of the material of the insulating member 20A include those having insulating properties, such as resins such as acrylic resin and epoxy resin.

The wiring conductor 30 has a function of electrically connecting the detection electrode pattern 20 and the driver 40. The wiring conductor 30 is provided on the first main surface 10a of the base 10 corresponding to the outer region _EO . Wiring conductor 30 has one end X detection electrode pattern 20X end 20 _S and Y sensing electrode pattern 20Y end 20 _S and is electrically connected to the other end is a flexible printed circuit board F which is located outside conductive region E _G It is connected to the driver 40 via

  Examples of the material of the wiring conductor 30 include a conductive material, such as ITO, tin oxide, aluminum, aluminum alloy, silver, or silver alloy. Moreover, the formation method of the wiring conductor 30 includes the same method as that of the detection electrode pattern 20.

  As shown in FIG. 4, the driver 40 includes an oscillation unit 41, a capacitance measurement unit 42, and a coordinate calculation unit 43.

  The oscillation unit 41 has a function of transmitting a voltage signal to the detection electrode pattern 20. The oscillation unit 41 is electrically connected to the detection electrode pattern 20 via the flexible printed board F.

  The capacitance measuring unit 42 has a function of measuring the capacitance generated at the detection electrode 21. The capacitance measuring unit 42 includes an operational amplifier 421, a capacitor 422, a reset switch 423, and an AD converter 424. The operational amplifier 421 has a function of amplifying an input signal. The operational amplifier 421 is electrically connected to the X detection electrode pattern 20X and the Y detection electrode pattern 20Y, the capacitor 422, and the reset switch 423.

Capacitor 422 accumulates charges with capacitance Cp between X detection electrode 21X or Y detection electrode 21Y and ground, and capacitances C _DX and C _DY between X detection electrode 21X or Y detection electrode 21Y and the conductor, respectively. It has the function to do.

  The reset switch 423 has a function of controlling the number of transfers of charges accumulated in the capacitor 422. The reset switch 423 is set to be turned on / off at a predetermined cycle, and the detection time can be controlled by the reset switch 423.

  The AD converter 424 has a function of digitizing a signal. That is, the signal output from the operational amplifier 421 is digitized by the AD converter 424. Further, the AD converter 424 outputs the digitized signal to the coordinate calculation unit 43.

The capacitance measuring unit 42, a capacitor 422, each charge in the capacitance _{C D} between the capacitor Cp and X detection electrodes 21X or Y detection electrode 21Y and the conductor between the X detection electrodes 21X or Y detection electrode 21Y and the ground The charge is accumulated and the reset switch 423 outputs the charge to the AD converter 424 via the operational amplifier 421 at a predetermined cycle. This output signal is digitized by the AD converter 424. In the present embodiment, the configuration in which the capacitance measuring unit 42 is incorporated in the driver 40 has been described. However, the configuration is not limited to this configuration as long as the capacitance generated in the detection electrode 21 can be measured.

  The coordinate calculation unit 43 has a function of calculating the X coordinate and the Y coordinate of a portion where the conductor is close or in contact. Specifically, the coordinate calculation unit 43 first determines whether or not the conductor has approached or contacted the second main surface 10 b of the base body 10 based on the capacitance measured by the capacitance measurement unit 42. About this determination, the threshold value is set and it determines with this threshold value as a reference | standard. That is, the coordinate calculation unit 43 determines that the conductor is close or in contact when the capacitance that changes due to the proximity or contact of the conductor exceeds a threshold with reference to the capacitance when the conductor is not close or in contact. In the present embodiment, the configuration in which the coordinate calculation unit 43 is incorporated in the driver 40 has been described. However, the configuration is limited to this configuration as long as the X coordinate and the Y coordinate of the position where the conductor approaches or contacts can be calculated. Absent.

  Next, the detection principle of the input position of the input device 1 will be described with reference to FIGS. 4 and 5.

In the input device 1, a voltage is applied to the X detection electrode pattern 20 </ b> X and the Y detection electrode pattern 20 </ b> Y from the oscillation unit 41 of the driver 40 through the wiring conductor 30. That is, in the input device 1, the X detection electrode 21X and the Y detection electrode 21Y are charged, a capacitance _CPX is generated between the X detection electrode 21X and the ground, and between the Y detection electrode 21Y and the ground. A capacitance C _PY is generated.

In the input device 1, first, the capacitance C _PX generated in the X detection electrode pattern 20 </ b> X ₁ is measured by the capacitance measuring unit 42. Next, to measure the capacitance _{C PX} occurring X detection electrode pattern 20X ₂ by the capacitance measuring part 42. Thus, the capacitance measuring part 42 to measure the capacitance _{C PX} generated from 1 to I-th all X detection electrode pattern 20X (Op1).

After the measurement of the capacity of all the X sensing electrode pattern 20X completed by the capacitance measuring unit 42, the coordinate calculation unit 43 determines whether the conductor is close to or contact with the input region E _I in the X direction ( Op2). Specifically, the coordinate calculation unit 43 determines whether or not the capacitance (capacitance generated in the X detection electrode) measured by the capacitance measurement unit 42 exceeds a threshold value. If determined that the conductors are close to or in contact with respect to the input region _{E I} in the X direction (YES at Op2), the coordinate calculation unit 43 extracts the capacitance of the X detection electrode pattern 20X exceeding the threshold value (Op3) . On the other hand, if determined that the conductor in the X direction is not close or in contact to the input region _{E I} (at Op2 NO), it returns to Op1.

Then, similarly to the detection electrode patterns 20X, capacitance measuring unit 42 to measure the capacitance _{C PY} generated from 1 to J-th all Y detection electrode pattern 20Y (Op4).

After the capacitance measurement unit 42 finishes measuring the capacitances of all the Y detection electrode patterns 20Y, the coordinate calculation unit 43 determines whether or not the conductor is close to or in contact with the input region E _I in the Y direction ( Op5). Specifically, the coordinate calculation unit 43 determines whether or not the capacitance (capacitance generated in the Y detection electrode) measured by the capacitance measurement unit 42 exceeds a threshold value. When it is determined in the Y direction conductors are close to or in contact with respect to the input region _{E I} (YES in Op5), the coordinate calculation unit 43 extracts the capacitance of the Y detection electrode pattern 20Y exceeding the threshold value (Op6) . On the other hand, if determined that the conductor in the Y direction is not close or in contact to the input region _{E I} (in Op5 NO), it returns to Op1.

Then, the coordinate calculation unit 43 calculates the X coordinate and the Y coordinate as the input position based on the capacitance of the X detection electrode pattern 20X extracted at Op3 and the capacitance of the Y detection electrode pattern 20X extracted at Op6. Calculate (Op7). In this way, the input device 1 can detect the input coordinates. The detection principle of the input position of the input device 1 described above is an example. If the X coordinate and the Y coordinate of the position where the conductor is close to or in contact with the input region E _I can be obtained, the input device 1 The detection principle is not limited to this.

In the following, the processing of the coordinate calculation unit 43 of Op7 when the conductor is simultaneously approaching or contacting (so-called multi-touch) at two places in the input area E _I will be further compared with the operation of the conventional input device. This will be described in detail.

In an input device employing a conventional line scan method, the areas of the plurality of detection electrodes 21 in the detection electrode pattern 20 are formed substantially the same in plan view. Therefore, for example, when the conductor is close to or in contact with two portions of the input region E _I , for example, white circles (X1, Y1) and (X2, Y2) simultaneously, in the X direction (X detection electrode 21X). The change in capacitance and the change in capacitance in the Y direction (Y detection electrode 21Y) are as shown in FIG.

That is, since the line scan method is employed, the capacitances of the coordinates X1 and the coordinates X2 change as shown in FIG. Specifically, the capacitance C _X1 at the coordinate _X1 is substantially the same size as the capacitance C _{X2 at the} coordinate X2. In addition, since the line scan method is adopted, the capacities of the coordinates Y1 and the coordinates Y2 change. Specifically, the capacity C _Y1 at the coordinate _Y1 is approximately the same size as the capacity C _{Y2 at the} coordinate Y2. For this reason, the coordinate calculation unit can determine that the X coordinate of the input position is X1 and X2, and the Y coordinate of the input position is Y1 and Y2. For this reason, the coordinate calculation unit cannot correctly determine the location (white circle in FIG. 6) where the conductor actually approaches or contacts. Specifically, the coordinate calculation unit is a combination of (X1, Y1) and (X2, Y2) with input coordinates of white circles, or (X1, Y2) and (X2, Y1) with input coordinates of black circles. It was not possible to determine whether it was a combination. That is, in the conventional input device, when a plurality of conductors approach or come into contact at the same time, the input coordinates are not fixed, and a so-called ghost problem occurs in which it is erroneously detected as a contact at a different position.

In contrast, in the input device 1 according to the present embodiment, in plan view, the area of each of the plurality of detection electrodes 21 of the detection electrode patterns 20, from one end 20 _S that the wiring conductor 30 is connected It has become successively smaller over the 20 _F. For this reason, as shown in FIG. 7, when the conductor is close to or in contact with two portions of the input area E _I , for example, white circles (X1, Y1) and (X2, Y2) simultaneously, Similar to the input device, the capacitances of the coordinates X1 and X2 change, and the capacitances of the coordinates Y1 and Y2 change. However, in the input device 1, the capacity C _X1 at the coordinate _X1 is larger than the capacity C _{X2 at the} coordinate X2. Further, in the input device 1, the capacitance C _Y1 at the coordinate _Y1 is larger than the capacitance C _{Y2 at the} coordinate Y2. For this reason, the coordinate calculation unit 43 can correctly determine two places (white circles in FIG. 7) where the conductors actually approach or contact each other in the processing of Op7.

That is, as shown in FIG. 8, when the conductor is close to or in contact with two portions of the input area E _I , for example, white circles (X2, Y1) and (X1, Y2) simultaneously, as shown in FIG. Contrary to the aspect, the capacity C _X2 at the coordinate _X2 is larger than the capacity C _{X1 at the} coordinate X1. In contrast to the aspect shown in FIG. 7, the capacity C _Y2 at the coordinate _Y2 is larger than the capacity C _{Y1 at the} coordinate Y1. For this reason, the coordinate calculation unit 43 can correctly determine two places (white circles in FIG. 8) where the conductors actually approach or contact each other in the processing of Op7.

  As described above, in the input device 1, it is possible to reduce the occurrence of ghosts.

[Configuration of display device]
FIG. 9 is a cross-sectional view illustrating an example of the display device 3 according to the second embodiment. As shown in FIG. 9, the display device 3 includes an input device 1 and a liquid crystal display device 2.

  The liquid crystal display device 2 includes a liquid crystal display panel 2a, a light source device 2b, and a housing 2c.

Light source device 2b has a function of irradiating light toward the liquid crystal display panel 2a, it is arranged between the liquid crystal display panel 2a and a lower housing 2c _2.

  The housing 2c plays a role of housing the liquid crystal display panel 2a and the light source device 2b, and includes an upper housing 2c and a lower housing 2c. Examples of the material of the housing 2c include a resin such as polycarbonate or a metal such as stainless steel (SUS) or aluminum.

  The display device 3 is, for example, a portable terminal device such as a mobile phone or a PDA (Personal Digital Assistant), a programmable display device used in industrial applications such as a factory, an electronic notebook, a personal computer, a copying machine, or a game. It is provided in various electronic devices such as terminal devices.

  As described above, according to the display device 3 of the present embodiment, since the input device 1 is provided, the occurrence of ghost can be reduced.

[Embodiment 2]
FIG. 10 is a plan view illustrating an example of the input device 1A according to the second embodiment. FIG. 11 is an enlarged plan view of a portion R1 in FIG.

As shown in FIGS. 10 and 11, in the input device 1 </ b> A, each of the plurality of detection electrodes 21 has an opening 211. In plan view, the area of the opening 211 gradually increases from the one end 20 _S to the other end 20 _F of the detection electrode pattern 20. In this manner, in the input device 1 </ b> A, as in the input device 1, the areas of the plurality of detection electrodes 21 are sequentially reduced from the one end 20 _S to the other end 20 _F of the detection electrode pattern 20. Thereby, the input device 1 </ b> A can obtain the same effects as the input device 1. Further, in the input device 1A, since the detection electrode 21 is provided with the opening 211, even if a patterning shift occurs when the opening 211 is formed by patterning, the area of the desired detection electrode 21 is greatly increased. Shifting can be reduced.

Further, as shown in FIG. 12, by providing a plurality of openings 211 to the detecting electrode 21, a plurality of detection electrodes 21 of the respective areas, sequentially from one end 20 _S of the detection electrode pattern 20 toward the other end portion 20 _F It may be made smaller. If it does in this way, it can be made difficult to visually recognize the opening part 211. FIG.

[Embodiment 3]
FIG. 13 is a plan view illustrating an example of the input device 1B according to the third embodiment. FIG. 14 is an enlarged view of a main part of the input device 1B. The difference between the input device 1 and the input device 1B is that an adjustment pattern T is provided between adjacent detection electrodes 21 in the input device 1B.

  As shown in FIGS. 13 and 14, the adjustment pattern T is provided between the adjacent detection electrodes 21 in plan view. The adjustment pattern T is located on the first main surface 10 a of the base body 10. The adjustment pattern T includes the same material as the detection electrode 21.

As the area of the detection electrode 21 decreases, the space between the adjacent detection electrodes 21 increases. In other words, since the transmittance of light becomes large in this portion, there is a case where display unevenness occurs in the input region E _I. In contrast, in the input device 1B, since an adjusting pattern T between the detection electrodes 21 adjacent, can reduce the display unevenness in the input region E _I.

  Further, in the input device 1B, the visible light transmittance of the adjustment pattern T is set within ± 10% of the visible light transmittance of the detection electrode 21 by setting the visible light transmittance of the adjustment pattern T. Is substantially the same as the visible light transmittance of the detection electrode 21.

  The visible light transmittance can be measured, for example, as follows. First, an emission spectrum of transmitted light that is transmitted through an object by irradiating the object with visible light is measured. The emission spectrum of the transmitted light and the emission spectrum of the emitted light obtained by measurement are represented by a graph of the relationship between the light intensity and the wavelength. From this graph, the visible light transmittance can be determined by calculating the area difference between the emission spectrum of the transmitted light and the emission spectrum of the emitted light in the visible light range of the wavelength. That is, the smaller the area difference, the higher the visible light transmittance.

  The specific embodiment of the present invention has been described above, but the present invention is not limited to this.

  In the display device 3, the example provided with the input device 1 has been described. However, even if the input devices 1 </ b> A and 1 </ b> B according to other embodiments are provided, the same effect as described above can be obtained.

  In the input device X2, the adjustment pattern T may be provided in the opening 211 of the detection electrode 20.

  In the display device 3, the example in which the display panel is the liquid crystal display panel 2 has been described. However, the display device 3 is not limited thereto. That is, the display panel may be a CRT, plasma display, organic EL display, inorganic EL display, LED display, fluorescent display tube, field emission display, surface electric field display, electronic paper, or the like.

1, 1A, 1B Input device 2 Display device 3 Liquid crystal display device 10 Base 20 Detection electrode pattern 30 Wiring conductor 40 Driver 42 Capacity measurement unit 43 Coordinate operation unit 2a Display panel 60 Adjustment pattern

Claims (5)

A substrate;
A detection electrode pattern having a plurality of detection electrodes and a connection part for electrically connecting the adjacent detection electrodes, and provided on the substrate;
A wiring conductor electrically connected to one end of the detection electrode pattern and provided on the substrate;
A driver having a capacitance measuring unit for measuring a capacitance generated in the detection electrode and a coordinate calculating unit for calculating input coordinates based on the capacitance measured by the capacitance measuring unit, and electrically connected to the wiring conductor; With
In plan view, an area of each of the plurality of detection electrodes is gradually reduced from the one end of the detection electrode pattern to the other end of the detection electrode pattern. Each of the plurality of detection electrodes has an opening,
2. The input device according to claim 1, wherein an area of the opening is sequentially increased from the one end to the other end of the detection electrode pattern in a plan view.   The input device according to claim 1, wherein an adjustment pattern is provided between the adjacent detection electrodes. The input device according to any one of claims 1 to 3,
A display device comprising: a display panel disposed opposite to the input device.   The display device according to claim 4, wherein the display panel is a liquid crystal display panel.

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