JP2011248694A - Pointer detection apparatus - Google Patents

Abstract

An object of the present invention is to effectively prevent noise from entering a sensor member from a display element.
A shield member is provided between a sensor member and a display element. The shield member 2 and the conductive member (electrically grounded conductive member) 4 are electrically connected by a connecting member 3 having conductivity at the outer edge thereof. The shield member 2, the connection member 3, and the conductive member 4 constitute a shield for the sensor member 1, and prevents noise generated from the display screen of the display element 5 from entering the sensor member 1.
[Selection] Figure 1

Description

  The present invention relates to a pointer detection apparatus that detects the position of a pointer by, for example, an electrostatic coupling method.

  Conventionally, various methods such as a resistive film method and an electrostatic coupling method (capacitance method) have been proposed as methods for detecting the position of an indicator such as a finger or a dedicated pen used in a touch panel or the like. . Among them, in recent years, electrostatic coupling type indicator detection devices have been actively developed.

  The electrostatic coupling method is roughly classified into two types: a surface type (Surface Capacitive Type) and a projection type (Projected Capacitive Type). The surface type is applied to, for example, ATM (Automated Teller Machine), and the projection type is applied to, for example, a mobile phone.

  An electrostatic coupling surface type indicator detection device is generally composed of a cover layer on the surface, a conductive film on the substrate layer, and electrodes at four corners. When a voltage is applied to the electrodes at the four corners, a uniform electric field is formed on the entire panel composed of the cover layer and the substrate layer. When an indicator such as a finger touches the panel, current flows from the four corners via the indicator. Therefore, by measuring the ratio of the current flowing from the four corners to the indicator, the panel touched by the indicator The upper position can be specified.

  On the other hand, the electrostatic coupling type projection type indicator detection device is configured, for example, by forming electrodes in a predetermined pattern on a transparent substrate or a transparent film (transparent conductive film). And it becomes the structure which can pinpoint the position on the panel which the indicator contacted by detecting the change of the electrostatic coupling state between the indicator and the electrode when the indicator such as a finger approaches. ing.

  In this way, the electrostatic coupling type indicator detection device detects a change in the electrostatic coupling state between the conductive film and the indicator (eg, finger, electrostatic pen, etc.) for both the surface type and the projection type. The position of the indicator is detected. For this reason, it can be said that the electrostatic coupling type indicator detection device has a configuration that is easily affected by external electrical noise.

  Therefore, in Patent Document 1 described later, a highly reliable liquid crystal display with a touch panel that is not affected by an electrical noise generated by a liquid crystal display element in an electrostatic coupling type indicator detection device (capacitive touch panel). An apparatus invention is disclosed.

  Specifically, Patent Document 1 discloses an electrical connection between the liquid crystal display element and the capacitive touch panel between the liquid crystal display element and the capacitive touch panel arranged on the observation side. A shield for shielding electrical noise generated by the liquid crystal display element, comprising a transparent conductive film for shielding and a low-resistance frame-like electrode formed in an endless frame shape on the entire periphery of the transparent conductive film. A liquid crystal display device with a touch panel in which a layer is interposed is disclosed.

  The frame electrode is made of a low resistance film such as metal, conductive paste, or carbon resin, and includes a grounding terminal and is grounded through the grounding terminal.

JP 2009-86184 A

  By the way, in the case of the invention described in Patent Document 1 described above, when the screen size of the liquid crystal display element is relatively small, such as a mobile phone terminal, the liquid crystal to the electrostatic coupling type indicator detection device is used. It is possible to effectively prevent noise from entering the display element.

  However, as the screen size of a liquid crystal display element increases, for example, in a liquid crystal display device for a computer, the area of the transparent conductive film interposed between the liquid crystal display element and the electrostatic coupling type indicator detection device also increases. It will be big.

  For this reason, when the resistance value of the transparent conductive film is taken into consideration, in order to properly flow noise from the liquid crystal display element to the ground side, the frame-shaped electrode of the shield layer must be grounded (GND connection) at several points. Is considered to occur.

  As described above, assuming that the frame-shaped electrode of the shield layer must be grounded at several places, for example, the housing side of a liquid crystal display device for a computer on which the device including the capacitive touch panel and the liquid crystal display element is mounted. In addition, a matching ground end must be formed. This means that manufacturing restrictions are increased. Further, if the number of grounding terminals to be connected increases, it takes time and effort to connect the grounding terminals, which may result in an increase in cost.

  In view of the above, the present invention is a sensor for detecting the indication position of an indicator without causing inconveniences such as a complicated manufacturing process and time-consuming and time-consuming connection of a grounding end. An object of the present invention is to effectively prevent noise from entering the display element.

In order to solve the above-described problem, the pointer detection apparatus of the invention according to claim 1
A sensor member which is formed in a substantially flat plate shape, and one surface side is provided for indicating a position by an indicator;
A shield member disposed opposite to the other surface of the sensor member;
A substantially flat display element having a display region on one surface, the one surface being disposed to face the shield member;
A conductive member disposed opposite to the shield member and having electrical conductivity, which is electrically grounded;
A conductive connecting member disposed between the shield member and the conductive member to electrically connect the shield member and the conductive member;
It is characterized by providing.

  According to the pointer detection apparatus of the first aspect of the present invention, the shield member is provided between the sensor member and the display element. Then, the shield member and the conductive member are electrically connected by the connection member.

  Thereby, noise emitted (emitted) from the display screen of the display element is absorbed by the shield member provided between the display element and the sensor member, and flows to the ground side through the connection member and the conductive member. To be. Therefore, it is possible to effectively prevent noise emitted from the display element from entering the sensor member.

  Further, since the shield member and the conductive member are electrically connected by the connecting member, the configuration and the manufacturing process are not complicated. In addition, since there is no need to ground at a plurality of locations, it is possible to avoid inconveniences such as troublesome and time-consuming connection of installation ends.

  According to the present invention, the display element to the sensor for detecting the indication position of the indicator without causing inconveniences such as a complicated manufacturing process and troublesome and time-consuming connection of the installation end. It is possible to effectively prevent noise from entering.

It is a figure for demonstrating the pointer detection apparatus of 1st Embodiment. It is a figure for demonstrating the modification of the pointer detection apparatus of 1st Embodiment. It is a figure for demonstrating the pointer detection apparatus of 2nd Embodiment. It is the figure which expanded and showed sectional drawing of the pointer detection apparatus of 2nd Embodiment. It is a figure for demonstrating the pointer detection apparatus of 3rd Embodiment. It is the figure which expanded and showed sectional drawing of the pointer detection apparatus of 3rd Embodiment.

  Hereinafter, an embodiment of a pointer detection apparatus according to the present invention will be described with reference to the drawings.

[First Embodiment]
A pointer detection apparatus according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram for explaining the pointer detection apparatus according to the first embodiment. In FIG. 1, FIG. 1A is an exploded perspective view of the pointer detection apparatus of the first embodiment, and FIG. 1B is a cross-sectional view of the pointer detection apparatus of the first embodiment.

  As shown in FIG. 1, the pointer detection apparatus according to the first embodiment is configured by stacking a sensor member 1, a shield member 2, a connection member 3, a conductive member 4, and a display element 5. is there.

  In the embodiment described below, the sensor member 1 is a so-called electrostatic touch panel of an electrostatic coupling type projection type. As shown in FIG. 1A, the sensor member 1 is a quadrangle having a length T and a length Y. It is a panel (plate) shape.

  Specifically, the sensor member 1 includes a transmission conductor group composed of a plurality of linear conductors formed by edging an ITO (Indium Tin Oxide) film provided by sputtering, for example, on each of the opposing surfaces of the transparent substrate. And a so-called double-sided sensor provided with a receiving conductor group.

  That is, one surface of the sensor member 1 is provided with a transmission conductor group configured by arranging a plurality of linear conductors extending in the x-axis direction at equal intervals in the y-axis direction. The surface is provided with a receiving conductor group configured by arranging a plurality of linear conductors extending in the y-axis direction at equal intervals in the x-axis direction.

  Here, the transparent substrate is made of a glass plate or a resin film. Further, the transmission conductor group and the reception conductor group provided on each transparent substrate are made of a plurality of transparent electrodes or ultrafine copper wires.

  In addition, the sensor member 1 is not restricted to the thing of the double-sided mounting mentioned above. A so-called single-sided mounting structure having a structure in which the transmission conductor and the reception conductor substantially intersect on one surface of the transparent substrate may be employed.

  In the single-sided mounting sensor member, the receiving conductor is composed of a linear conductor extending in the y-axis direction, like the double-sided mounting sensor member described above. However, the transmission conductor is not a linear conductor continuous in the x-axis direction, but is cut at a portion intersecting with the reception conductor. Then, an insulating layer is provided at a cut portion of the receiving conductor, and a transmission conductor that is cut by providing a metal member such as molybdenum on the insulating layer is formed in one line.

  As described above, in the first embodiment, the sensor member 1 is formed in a substantially flat plate shape, and the position of one surface side can be indicated by an indicator such as a finger. Although not shown, a protective layer made of a surface sheet such as polycarbonate is provided on the surface side of the sensor member 1 whose position is indicated by the indicator, so that the sensor member 1 is protected from wear due to contact of the indicator. Protect.

  The shield member 2 is a member for preventing noise emitted from the display element 5 to be described later from entering the sensor member 1, and faces the surface opposite to the surface of the sensor member 1 whose position is indicated by the indicator. Arranged. The shield member 2 has the same size as the opposing surface of the sensor member 1.

  For the shield member 2, for example, a transparent conductive film such as an ITO film is used. In addition, a film-like material formed using zinc oxide, tin oxide, or the like may be used.

  Further, the shield member 2 is not limited to a film or sheet, and a conductive transparent member formed in a plate shape can also be used. That is, in the pointer detection apparatus of the first embodiment, the shield member 2 formed in a film shape, a sheet shape, or a plate shape is close to the sensor member 1 and one surface. Alternatively, it is provided by bonding.

  The connecting member 3 electrically connects the shield member 2 described above and the conductive member 4 described later, and dust is formed in an air gap (gap) 6 formed when the members shown in FIG. 1A are stacked. This is a member for preventing the contamination. In the first embodiment, the connection member 3 is made of, for example, conductive rubber.

  And the connection member 3 is formed in the frame shape which matched the shape of the edge part by the side of the shield member 2 of the electroconductive member 4 mentioned later. That is, the outer edge of the connection member 3 coincides with the outer edge of the sensor member 1, the shield member 2, and the conductive member 4 described later, and the inner edge of the connection member 3 matches the inner edge of the upper surface of the conductive member 4 described later. have.

  The conductive rubber forming the connection member 3 is a synthetic rubber in which conductive particles such as carbon particles or silver particles are mixed, and a material having conductivity and elasticity is used. The conductive rubber includes a type in which the electric resistance value depends on the pressure and a type in which the electric resistance value does not depend on the pressure, and any of them can be used. However, in the following, in order to simplify the description, it is assumed that a type whose electric resistance value does not depend on pressure is used.

  The conductive member 4 is disposed opposite to the shield member 2 and is electrically grounded. In the first embodiment, the conductive member 4 is provided for the display element 5 described later. It also has a function as a bezel (frame part). And when the indicator detection apparatus of this 1st Embodiment is mounted in the housing | casing etc. of the display apparatus of a personal computer, for example, the electroconductive member 4 is earth | grounded as a whole. In the following, mounting the pointer detection apparatus according to the embodiment on a housing or the like of a display unit of a personal computer, for example, is referred to as “mounting on a device”.

  And in this 1st Embodiment, the electroconductive member 4 is the 1st attaching part (wall part (side surface) for attaching the connection member 3 mentioned above to the position close | similar to the periphery of the display element 5 mentioned later. Part)) 4a.

  In the first embodiment, the conductive member 4 has a second attachment portion (bottom portion) 4b for attaching a display element 5 to be described later, and a so-called bag (including a display element 5 inside). Tab).

  Further, in the first embodiment, the conductive member 4 has an end portion on the side connected to the connection member 3 of the first attachment portion (wall portion (side surface portion)) 4a on the inner side of the conductive member 4. It has the top part 4d formed by extending | stretching. That is, as shown in FIG. 1A, the upper surface of the conductive member 4 includes an opening 4c for allowing a display screen of a display element to be described later to be viewed, and a top 4d of the first mounting portion 4a. ing.

  In this way, the conductive member 4 has a so-called bowl-like shape having the first mounting portion (wall portion (side surface portion)) 4a and the second mounting portion (bottom portion) 4b. Except for noise generated from the element, noise generated from the display screen side, noise from the first mounting portion (wall portion (side surface portion)) 4a side or second mounting portion (bottom portion) 4b side is exposed to the outside. It can be prevented from being released.

  In the first embodiment, the first attachment portion 4a of the conductive member 4 is extended toward the shield member 2 along the four sides of the second attachment portion 4b, which is a rectangular bottom. However, the shape or the like of the first attachment portion 4a is not limited to this. This is because the object of the present invention can be achieved if the shield member 2 and the conductive member 4 are electrically connected via the connection member 3.

  Therefore, the first attachment portion 4a may be formed in a wall shape or a column shape at one or more positions on the outer periphery of the second attachment portion 4b. For example, the wall-shaped first attachment portion 4a may be formed only on one of the four sides of the second attachment portion 4b, or two of the four sides of the second attachment portion 4b. Alternatively, a wall-shaped first attachment portion may be formed on three sides.

  Moreover, the 1st attachment part 4a on a pillar is formed in four corners of the 2nd attachment part 4b, or each of four sides of the 2nd attachment part 4b has one or more columnar 1st attachment parts. May be formed. Further, the wall-shaped first mounting portion 4a and the columnar first mounting portion 4a may be used in combination.

  Further, the length of the first mounting portion 4a in the direction along the x-axis and the length of the first mounting portion 4a in the direction along the y-axis are the lateral length Y of the sensor member 1 and the like, An appropriate length can be set within the range of the length T.

  Further, in the first embodiment, as described above, the case where the second mounting portion 4b that is the bottom portion for mounting the display element 5 is described as an example, but the second mounting portion is described. 4b is not necessarily required. You may make it comprise the electroconductive member 4 only by the 1st attaching part 4a. This is because the object of the present invention can be achieved if the shield member 2 and the conductive member 4 are electrically connected via the connection member 3.

  Therefore, even when the second mounting portion 4b is provided, the second mounting portion 4b is formed in a plate shape, a net shape, or the triangular shape at the four corners of the bottom surface of the conductive member 4. It is possible to provide the second mounting portion in various modes, such as providing two mounting portions.

  In the first embodiment, the conductive member 4 extends from the end of the first attachment portion 4a on the side connected to the connection member 3 in the inner direction of the conductive member 4 to form the top portion 4d. In the present invention, the top portion 4d may be formed by extending in the outer direction of the conductive member 4.

  In addition, for example, when the first mounting portion 4a is provided corresponding to each of the four sides of the second mounting portion 4b, the top portion 4d has each side of any one or more sides of the second mounting portion 4b. It may be provided only at the end on the extending side of the first mounting portion 4a provided corresponding to.

  In addition, by providing the top part 4d on the extending side (shield member 2 side) of the first attachment part 4a, the contact surface property between the connection member 3 and the conductive member 4 is widened, and a more stable contact state is maintained. be able to. However, it is not always necessary to provide the top portion 4d in the first mounting portion 4a, and it is of course possible to provide the first mounting portion 4a having a configuration of only the wall portion.

  The display element 5 is a liquid crystal display element and is a so-called thin display element that includes a liquid crystal cell, a liquid crystal backlight unit (light guide plate), a liquid crystal backlight, and the like (not shown). The display element 5 has a display screen (display area) on the shield member 2 side. The display element 5 is arranged so that the display screen faces the shield member 2 described above.

  As described above, the connection member 3 has a shape that matches the shape of the end of the conductive member 4 on the shield member 2 side. That is, in the first embodiment, as shown in FIG. 1A, the widths w1, w2, w3, and w4 of the corresponding portions of the connecting member 3 and the top portion 4d of the conductive member 4 are the same width. It is supposed to be.

  As shown in FIG. 1A, the sensor member 1, the shield member 2, the connection member 3, the conductive member 4, and the display element 5 are stacked in the z-axis direction so that the outer edges of the respective members coincide. As a result, as shown in FIG. 1B, the pointer detection apparatus according to the first embodiment, which includes the conductive member 4, the connection member 3, the shield member 2, and the sensor member 1 in which the display element 5 is included, is formed. Is done.

  When the conductive member 4, the connecting member 3, the shield member 2, and the sensor member 1 are laminated, an air gap (gap) is formed between the upper surface of the display element 5 and the shield member 2 as shown in the cross-sectional view of FIG. 1B. 6 is formed.

  In the case of the pointer detection apparatus according to the first embodiment, since the connection member 3 is formed of a conductive rubber having elasticity, it is connected by applying an appropriate pressure in the stacking direction at the outer edge portion. The member 3 is in close contact with the conductive member 4 and the shield member 2. That is, the connection member 3 is in close contact with the top 4d of the conductive member 4 on one surface in the stacking direction, and is in close contact with the outer edge portion of the shield member 2 on the other surface.

  Thereby, the shield member 2, the connection member 3, and the conductive member 4 are electrically connected. That is, the sensor member 1 is shielded from the display element 5 by the shield member 2, the connection member 3, and the conductive member 4.

  Therefore, noise emitted from the display screen side of the display element 5 is absorbed by the shield member 2 and flows to the ground (earth) through the connection member 3 and the conductive member 4.

  Thereby, the boarding of the noise emitted from the display screen of the display element 5 to the sensor member 1 can be effectively suppressed. As a result, the S / N ratio in the sensor member 1 can be improved. Furthermore, it is possible to prevent malfunction in the sensor member 1 due to noise.

  As described above, when the connecting member 3 is in close contact with the shield member 2 and the conductive member 4, dust or the like can be prevented from entering the air gap 6. Of course, bonding may be performed by filling the air gap 6 with resin or the like.

  The pointer detection apparatus according to the first embodiment can be formed by simply laminating the conductive member 4 containing the sensor member 1, the shield member 2, the connection member 3, and the display element 5. Therefore, the formation process of the indicator detection device is not complicated, and a high-quality indicator detection device that effectively prevents noise from the display element from entering the sensor member 1 can be formed.

  In addition, since the conductive member 4 functions as a ground member as a whole, the connection position, the number of connection points, and the like are not restricted when connecting to the actual ground. Therefore, when the pointer detection apparatus according to the first embodiment is mounted on a device, the connection to the ground is not subject to various restrictions, and labor and time can be prevented.

[Modification of First Embodiment]
A modification of the pointer detection apparatus according to the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram for explaining a modification of the pointer detection apparatus according to the first embodiment. 2, FIG. 2A is an exploded perspective view of the pointer detection apparatus according to the modification, and FIG. 2B is a cross-sectional view of the pointer detection apparatus according to the modification.

  In the pointer detection apparatus of the modification shown in FIG. 2, the same reference numerals are given to the parts configured in the same manner as the pointer detection apparatus of the first embodiment shown in FIG. Detailed description is omitted.

  As can be seen from a comparison between FIG. 2 and FIG. 1, the indicator detection device of the modified example shown in FIG. 2 is replaced with a connecting member 3 formed in a frame shape of the indicator detection device shown in FIG. 1. The four connecting members 3a, 3b, 3c, and 3d formed on the quadrangular prism are used.

  Each of the connecting members 3a, 3b, 3c, and 3d is formed of a synthetic rubber in which conductive particles such as carbon particles or silver particles are mixed, as in the frame-shaped connecting member 3 described above, and has conductivity. It has elasticity.

  Each of the connection members 3a, 3b, 3c, and 3d is disposed at a position along each of the four sides of the shield member 2 and the four sides of the upper surface of the conductive member 4 as shown in FIG. And the top 4d of the conductive member 4.

  That is, the connecting member 3a is placed on the top 4d of the first mounting portion 4a located on the right side of the conductive member 4, and the connecting member 3c is located on the left side of the conductive member 4 in FIG. 2A. 1 is mounted on the top 4d of the mounting portion 4a.

  Similarly, the connecting member 3b is placed on the top 4d of the first mounting portion 4a located on the front side of the conductive member 4 in FIG. 2A, and the connecting member 3d is the conductive member 4 in FIG. 2A. Is mounted on the top portion 4d of the first mounting portion 4a located on the back side.

  In this case, as shown in FIG. 2A, the widths w1, w2, w3, and w4 of the connection members 3a, 3b, 3c, and 3d are placed on the top 4d of the first mounting portion 4a of the conductive member 4. This corresponds to the widths w1, w2, w3, and w4 of the portion.

  Further, the length T3 in the longitudinal direction of the connecting members 3a and 3c is set to a length equal to or shorter than the length T4 of the inner edge in the y-axis direction of the conductive member 4, and the length Y3 in the longitudinal direction of the connecting members 3b and 3d is The length is equal to or shorter than the length Y4 of the inner edge of the conductive member 4 in the x-axis direction.

  Thereby, as shown in the cross-sectional view of FIG. 2B, the shield member 2 and the conductive member 4 are electrically connected to each other by the connecting members 3a, 3b, 3c, and 3d. .

  2B, the shield member 2 and the conductive member 4 are electrically connected by the connecting member 3a on the right side, and the shield member 2 and the conductive member 4 are electrically connected by the connecting member 3c on the left side. Is shown.

  Further, as can be seen from FIG. 2A, the shield member 2 and the conductive member 4 are connected by the connecting member 3b on the front side of the conductive member 4, and the shield member 2 and the conductive member 4 are connected by the connecting member 3d on the back side. Are electrically connected.

  Thus, in the pointer detection apparatus of this modification, the shield member 2 and the conductive member 4 are electrically connected by the connection members 3a, 3b, 3c, and 3d. In this case, by using the four connection members 3a, 3b, 3c, and 3d, the shield member 2 and the conductive member 4 are electrically connected in the same manner as in the case of using the frame-shaped connection member 3 shown in FIG. Can be connected.

  That is, the sensor member 1 is shielded from the display element 5 by the shield member 2, the connection members 3 a, 3 b, 3 c, 3 d and the conductive member 4. And also in the case of the indicator detection apparatus of this example demonstrated using FIG. 2, the electroconductive member 4 functions as a grounding member as a whole.

  Therefore, in the indicator detection device of this modification, noise emitted from the display screen side of the display element 5 is absorbed by the shield member 2 and grounded through the connection members 3a, 3b, 3c, and 3d and the conductive member 4. Flows to (earth).

  Thereby, it can suppress effectively that the noise emitted from the display screen of the display element 5 gets into the sensor member 1. As a result, the S / N ratio in the sensor member 1 can be improved. Furthermore, it is possible to prevent malfunction in the sensor member 1 due to noise.

  In the modification of the first embodiment, the length T3 of each of the connection members 3a and 3c is a single member that is equal to or shorter than the length T4 of the inner edge of the conductive member 4 in the y-axis direction. However, the length of the connection members 3a and 3c is not limited to this. The length T3 of the connecting members 3a and 3c may be constituted by a plurality of conductive members that are shorter than the length T4 of the inner edge of the conductive member 4 in the y-axis direction, for example.

  Similarly, the connection members 3b and 3d have been described by exemplifying the case where each of the lengths Y3 in the longitudinal direction is constituted by one member having a length Y4 or less of the inner edge in the x-axis direction of the conductive member 4. Each of the conductive members 4 may be composed of a plurality of conductive members shorter than the length Y4 of the inner edge in the x-axis direction. Further, the widths w1 to w4 of the connection members 3a to 3d can be set as appropriate in a length that does not overlap the display area of the display element 5.

  Further, in order to efficiently flow noise from the display screen of the display element 5 to the ground side, the contact area between the shield member 2 and the connection members 3a, 3b, 3c, and 3d, and the conductive member 4 are connected. It is desirable to make the contact area with the members 3a, 3b, 3c, 3d, etc. as large as possible.

  In addition, in the case of the indicator detection device of the modification shown in FIG. 2, there are cases where there is a gap between adjacent connection members because the four connection members 3a to 3d are used. In such a case, it is desirable to bond the shield member 2 and the display screen of the display element 5 with a resin so that dust or the like does not enter.

  Also in the case of the indicator detection device of this modified example, the sensor member 1, the shield member 2, the connection members 3a, 3b, 3c, and 3d and the conductive member 4 including the display element 5 are simply laminated. Therefore, it is possible to form a high-quality pointing device that effectively prevents noise from the display element from getting into the sensor member 1 without complicating the forming process of the pointer detection device. it can.

  In addition, when mounting the pointer detection apparatus shown in the modification of the first embodiment on a device, the connection to the ground is not subject to various restrictions, and it does not take time and effort. can do.

[Second Embodiment]
A pointer detection apparatus according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is an exploded perspective view of the pointer detection apparatus according to the second embodiment, and FIG. 4 is a cross-sectional view of the pointer detection apparatus according to the second embodiment. In the pointer detection apparatus of the second embodiment shown in FIG. 3 and FIG. 4, the same reference numerals are given to the parts configured similarly to the pointer detection apparatus of the first embodiment shown in FIG. 1. A detailed description of these parts is omitted.

  As can be seen from a comparison between FIG. 3 and FIG. 1, in the pointer detection apparatus of the second embodiment shown in FIG. 3, the shape of the shield member 2A is used in the pointer detection apparatus shown in FIG. This is different from the shield member 2 being used.

  The shield member 2A in the pointer detection apparatus of the second embodiment is formed in a so-called tab shape. That is, as shown in FIG. 3, the shield member 2A includes a rectangular first surface portion 2Aa corresponding to the bottom surface portion of the shield member 2A, and side surface portions 2Ab, 2Ac along the four sides of the first surface portion 2Aa. 2Ad, 2Ae, and 2nd surface part 2Af extended in the direction which goes outside from the upper end of each side part 2Ab-2Ae.

  Thus, the shield member 2A has a so-called bowl-like shape, so that the first surface portion 2Aa of the shield member 2A can be disposed so as to be attached to the display screen side of the display element 5. .

  That is, the shield member 2 </ b> A is disposed between the first surface portion 2 </ b> Aa formed in substantially the same shape as the display screen of the display element 5, and the top portion 4 d of the conductive member 4 and the sensor member 1. The surface portion 2Af is provided. As shown in FIG. 4, the shield member 2 </ b> A has the first surface portion 2 </ b> Aa bonded to the display screen of the display element 5.

  Therefore, as can be seen from the cross-sectional view shown in FIG. 4, the depth d1 of the shield member 2A is the length from the lower surface 1a of the sensor member 1 to the upper surface 2A1 of the first surface portion 2Aa of the shield member 2A. Become.

  Further, the width of the second surface portion 2Af, which is the edge of the shield member 2A, is made substantially the same as the width of the upper surface of the connection member 3 except for the thickness of the shield member 2A. That is, as shown in FIGS. 3 and 4, the width of the second surface portion 2Af of the shield member 2A is equal to that on the left side of the connection member 3 except for the thickness of the shield member 2A in the x-axis direction in FIGS. Is the same width as the width w <b> 1 of the connection member 3, and is the same width as the width w <b> 3 of the connection member 3 on the right side of the connection member 3.

  Although not shown as a cross-sectional view, the width of the edge 2Af of the shield member 2A is the same as that of the connection member 3 on the back side of the connection member 3 except for the thickness of the shield member 2A in the x-axis direction in FIG. The width is the same as the width w2, and the width on the front side of the connection member 3 is the same as the width w4 of the connection member 3.

  Then, as shown in FIG. 4, the conductive member 4 including the display element 5, the connection member 3, the shield member 2 </ b> A, and the sensor member 1 are stacked in the z-axis direction. As a result, the pointer detection apparatus of the second embodiment is formed.

  In this case, since the first surface portion 2Aa which is the bottom surface portion of the shield member 2A is bonded to the display screen of the display element 5, an air gap (air gap) 6A is formed between the sensor member 1 and the shield member 2A. Is done.

  Also in the case of the pointer detection apparatus of the second embodiment, since the connecting member 3 is formed of a conductive rubber having elasticity, an appropriate pressure is applied in the stacking direction at the outer edge of the pointer detection apparatus. By adding, the connection member 3 adheres to the conductive member 4 and the shield member 2A. That is, the connection member 3 is in close contact with the top portion 4d of the conductive member 4 on one surface in the stacking direction, and in close contact with the second surface portion 2Af of the shield member 2A on the other surface.

  Thereby, shield member 2A, connecting member 3, and conductive member 4 are electrically connected. That is, the sensor member 1 is shielded from the display element 5 by the shield member 2 </ b> A, the connection member 3, and the conductive member 4.

  Therefore, noise emitted from the display screen side of the display element 5 is absorbed by the shield member 2A and flows to the ground (earth) through the connection member 3 and the conductive member 4.

  Thereby, the boarding of the noise emitted from the display element 5 to the sensor member 1 can be effectively suppressed. As a result, the S / N ratio in the sensor member 1 can be improved. Furthermore, it is possible to prevent malfunction in the sensor member 1 due to noise.

  Moreover, in the case of the second embodiment, the first surface portion 2Aa, which is the bottom surface portion of the shield member 2A, is bonded to the display screen of the display element 5, and the first of the sensor member 1 and the shield member 2A. Since the air gap (air gap) 6A is provided between the surface portion 2Aa, the influence on the transmission characteristics of the signal flowing through the transmission conductor group and the reception conductor group in the sensor member 1 can be reduced.

  That is, as described above, since the sensor member 1 is a conductive panel including a transmission conductor and a reception conductor, when the shield member 2a that is an ITO film that is a transparent electrode film is provided adjacent to the conductive panel, the sensor member 1 is provided. And the shield member 2A constitute a capacitor.

  In general, the capacitance of a capacitor can be expressed by εS / d (ε: dielectric constant of a dielectric between electrode plates, S: area of opposing electrodes, d: distance between electrodes). That is, the capacitance of the capacitor is inversely proportional to the distance between both electrodes.

  Therefore, the capacitance C of the capacitor configured between the sensor member 1 and the shield member 2a in the second embodiment is the sensor member 1 in the pointer detection apparatus of the first embodiment shown in FIG. And the capacitance of the capacitor formed between the shield member 2a and the shield member 2a. This is because in the pointer detection apparatus of the first embodiment, the shield member 2a is in close contact with the opposing surface of the sensor member 1, and therefore the distance between the electrodes is extremely short.

  For this reason, even if the sensor member 1 and the display element 5 are opposed to each other, the charge amount in the sensor member 1 can be reduced, and the influence on the signal transmission characteristics in the sensor member 1 can be further reduced.

  As shown in FIG. 4, also in the pointer detection apparatus of the second embodiment, when the connecting member 3 is in close contact with the shield member 2A and the conductive member 4, dust or the like is present in the air gap 6A. Can be prevented from entering. Of course, bonding may be performed by filling the air gap 6 with resin or the like.

  The pointer detection apparatus according to the second embodiment can be formed by simply laminating the conductive member 4 containing the sensor member 1, the shield member 2A, the connection member 3, and the display element 5. Therefore, the formation process of the indicator detection device is not complicated, and a high-quality indicator detection device that effectively prevents noise from the display element from entering the sensor member 1 can be formed.

  In addition, when the pointer detection apparatus according to the second embodiment is mounted on a device, the connection to the ground is not subject to various restrictions, and it is possible to prevent labor and time. .

[Third Embodiment]
The pointer detection apparatus in the 3rd Embodiment of this invention is demonstrated with reference to FIG.5 and FIG.6. FIG. 5 is an exploded perspective view of the pointer detection apparatus of the third embodiment, and FIG. 6 is a cross-sectional view of the pointer detection apparatus of the third embodiment. In the pointer detection apparatus of the third embodiment shown in FIGS. 5 and 6, the same parts as those of the pointer detection apparatus of the second embodiment shown in FIGS. 3 and 4 are the same. Reference numerals are assigned, and detailed description thereof is omitted.

  As can be seen by comparing FIG. 5 with FIG. 3, in the pointer detection apparatus of the third embodiment shown in FIG. 5, instead of the shield member 2A and the connection member 3 formed of conductive rubber, a shield The point detection using the member 2B and the connecting member 3B, which is a conductive tape, and the stacking order of the shield member 2B and the connecting member (conductive tape) 3B are the indicator detection in the first and second embodiments described above. The point which is reverse to the apparatus is different from the pointer detection apparatus of the second embodiment shown in FIG.

  In the third embodiment, the shield member 2B prevents noise emitted from the display element 5 from getting into the sensor member 1, similarly to the shield members 2 and 2A of the first and second embodiments described above. It is a member for doing.

  Further, the connection member 3B configured as a conductive tape is a conductive member that electrically connects the shield member 2B and the conductive member 4 in the same manner as the connection member 3 of the first and second embodiments described above. It is used as

  For example, the connection member 3B configured as the conductive tape includes conductive particles such as carbon particles and silver particles mixed in one surface of a metal foil base material (conductive foil base material) such as copper foil or aluminum foil. An adhesive is applied.

  The shield member 2B has a shape similar to the shield member 2A of the pointer detection apparatus of the second embodiment described with reference to FIGS. The dimensions of the details are different.

  As shown in FIG. 5, the shield member 2B according to the third embodiment has a quadrangular first surface portion 2Ba corresponding to the bottom surface portion of the shield member 2B and four sides of the first surface portion 2Ba. The side surface portions 2Bb, 2Bc, 2Bd, and 2Be along the second side surface portions 2Bb, 2Bc, 2Bd, and 2Be, and the second surface portion 2Bf extending outward from the upper ends of the side surface portions 2Bb, 2Bc, 2Bd, and 2Be.

  In this way, by forming the shield member 2B into a bowl shape, the first screen portion 2Ba of the shield member 2B is displayed on the display screen of the display element 5 even in the case of the pointer detection apparatus of the third embodiment. It is arranged so that it can be attached to the side.

  That is, also in the third embodiment, the shield member 2B includes the first surface portion 2Ba formed in substantially the same shape as the display screen of the display element 5, the top portion 4d of the conductive member 4, the sensor member 2, and the like. The second surface portion 2Bf interposed between the two is provided. As shown in FIG. 6, the shield member 2 </ b> B has the first surface portion 2 </ b> Ba bonded to the display screen of the display element 5.

  As can be seen from the cross-sectional view shown in FIG. 6, the depth d2 of the shield member 2B in the third embodiment is indicated by the display of the shield member 2B from the upper surface 2B1 of the shield member 2B indicated by the dotted line. The length of the element 5 is up to the surface 2B2 opposite to the surface in contact with the display screen.

  Accordingly, as shown in FIG. 6, the distance d from the lower surface 1a of the sensor member 1 to the surface 2B2 opposite to the surface of the shield member 2B that contacts the display screen of the display element 5 is equal to the depth d2 of the shield member 2B. The distance is the sum of the thicknesses of the conductive tape 3b.

  Further, the width of the second surface portion 2Bf, which is the edge of the shield member 2B, is narrower (shorter) than the width of the top portion 4d of the conductive member 4 and the width of the connection member 3B.

  That is, the connecting member 3B and the top 4d of the conductive member 4 have the same shape, and the widths are widths w1, w2, w3, and w4 as shown in FIG. The widths wa, wb, wc, wd of the second surface 2Bf that is the edge of the shield member 2B are the widths w1, w2, w3, w4 of the corresponding portions of the top 4d of the connecting member 3B or the conductive member 4. To be shorter.

  Specifically, as shown in FIG. 6, the left and right widths wa and wc of the second surface portion 2Bf of the shield member 2B are vertical frames of the connection member 3 except for the width in the direction intersecting the z-axis direction. The widths w1 and w3 of the portions and the widths w1 and w3 of the corresponding vertical frame portions of the top 4d of the conductive member 4 are about half (one half) the width.

  Although not shown, the widths wb and wd on the back side and the near side of the second surface portion 2Bf of the shield member 2B are the width w2 of the horizontal frame portion of the connection member 3 except for the width in the direction intersecting the z-axis direction. , W3 and the width w2 and w4 of the corresponding horizontal frame portion of the top 4d of the conductive member 4 are about half (1/2) the width.

  As shown in FIG. 6, it is assumed that the conductive member 4 including the display element 5, the shield member 2 </ b> B, the connection member 3 </ b> B that is a conductive tape, and the sensor member 1 are stacked in the z-axis direction. In this case, as shown in FIG. 6, the top part 4d of the conductive member 4 and the second surface part 2Bf of the shield member 2B are in direct contact with each other. Furthermore, a connecting member 3B, which is a conductive tape, is attached to the top 4d of the conductive member 4 and the second surface 2Bf of the shield member 2B from the upper surface side.

  Therefore, the shield member 2B has the second surface portion 2Bf which is the edge thereof directly connected to the top portion 4d of the conductive member 4, and the top portion of the conductive member 4 via the connection member 3B which is a conductive tape. Connected to 4d.

  In this case, since the top portion 4d of the conductive member 4 and the second surface portion 2Bf of the shield member 2B are bonded to each other by the connection member 3B, which is a conductive tape, there is no deviation and the solid difference between the shield members 2B. The high-quality indicator detection device can be configured.

  Thereby, the noise emitted from the display screen side of the display element 5 is absorbed by the shield member 2B, and is grounded (grounded) through the conductive member 4 or through the connecting member 3B and the conductive member 4 which are conductive tapes. Flowing.

  Therefore, it is possible to effectively suppress the noise emitted from the display element 5 from entering the sensor member 1. As a result, the S / N ratio in the sensor member 1 can be improved. Furthermore, it is possible to prevent malfunction in the sensor member 1 due to noise.

  Furthermore, as shown in FIG. 6, an air gap (air gap) 6B is formed between the sensor member 1 and the shield member 2B. For this reason, as in the case of the pointer detection apparatus of the second embodiment described above with reference to FIGS. 3 and 4, the distance d between the sensor member 1 and the shield member 2 </ b> B becomes long.

  As a result, as in the case of the pointer detection apparatus of the second embodiment described above, the capacitance C of the capacitor composed of the sensor member 1 and the shield member 2b is instructed so that the sensor member 1 and the shield member 2 are close to each other. It becomes smaller than the body detection device.

  Thereby, the transmission characteristic about the signal which flows through the transmission conductor group in the sensor member 1 or a reception conductor group can be improved compared with the case where the sensor member 1 and the shield member 2 are approaching.

  In the pointer detection apparatus of the third embodiment, bonding may be performed by filling the air gap 6B with resin or the like. Moreover, you may make it provide buffer materials, such as a Poron (trademark), between the sensor member 1 and the connection member 3B which is a conductive tape. By providing the cushioning material, dust or the like can be prevented from entering the air gap 6B, or the distance between the sensor member 1 and the shield member 2B can be slightly increased to improve the signal transmission characteristics of the sensor member 1. It is possible to do.

  The indicator detection device of the third embodiment is formed by simply laminating the sensor member 1, the connection member 3B that is a conductive tape, the shield member 2B, and the conductive member 4 containing the display element 5. Therefore, it is possible to form a high-quality indicator detection device that effectively prevents noise from the display element from entering the sensor member 1 without complicating the formation process of the indicator detection device. Can do.

  In addition, when the pointer detection apparatus according to the third embodiment is mounted on a device, the connection to the ground is not subject to various restrictions, and it is possible to prevent labor and time. .

[Others]
The sensor member 1, the shield members 2, 2A, 2B, the connection members 3, 3a, 3b, 3c, 3d, 3B, the conductive member 4, the display element 5 and the like have appropriate thicknesses in the stacking direction. it can.

  However, the shield members 2, 2 </ b> A, and 2 </ b> B that cover the entire display screen of the display element 5 are provided so that the display information displayed on the display screen of the display element 5 can be viewed without impairing the visibility. It is desirable to use a material with as high a transparency as possible.

  Also, the direction intersecting the stacking direction of the sensor member 1, the shield members 2, 2A, 2B, the connection members 3, 3a, 3b, 3c, 3d, 3B, the conductive member 4, the display element 5, etc. (FIGS. 1 to 3) The size in the x direction and the y direction in FIG. 5 can also be set appropriately.

  In this case, the connection members 3, 3 a, 3 b, 3 c, 3 d and the connection member 3 B may be configured not to hide the display screen of the display element 5, and from the outer edge of the conductive member 4 as necessary. It can also be configured to project.

  Moreover, in embodiment mentioned above, the connection members 3, 3a, 3b, 3c, 3d can be formed with the various elastic members which have electroconductivity other than conductive rubber. For example, various conductive elastic members such as conductive silicon rubber, conductive polyurethane rubber, and conductive corn rubber can be used as the connection member.

  Moreover, you may make it form the connection members 3, 3a, 3b, 3c, 3d with the gel-like material which has electroconductivity. Gel refers to a gel that has a high viscosity, loses fluidity, and becomes solid as a whole.

  Further, the conductive member 4 in the pointer detection apparatus of the above-described embodiment is not limited to a so-called tub shape. As described above, the conductive member 4 may have any shape as long as it is grounded and can be used as a grounding member.

  In the embodiment described above, a liquid crystal display element is used as the display element 5. Some liquid crystal display elements include a TN (Twisted Nematic) type and a VA (Vertical Alignment) type that apply an electric field in the thickness direction to the liquid crystal sandwiched between the glass substrates through electrodes disposed on the opposing glass substrates. In addition, there is an IPS (In-Plane Switching) type.

  In the case of an IPS type liquid crystal display element, the electrodes are arranged in the in-plane direction of one substrate, and an electric field is applied to the surface direction of the substrate to rotate the liquid crystal molecules in a plane parallel to the substrate (in-plane). It has become. In other words, there is no electrode on the other substrate side sandwiching the liquid crystal, and noise is easily emitted to the outside. For this reason, some IPS-type liquid crystal display elements are provided with a transparent conductive film such as an ITO film on the side of the substrate on which no electrode is provided to suppress noise emission.

  Therefore, in the case of an IPS type liquid crystal display element in which a transparent conductive film such as an ITO film is provided on the substrate side on which no electrode is provided, the transparent conductive film already provided and a bezel as a grounding member are connected to conductive rubber. And electrically connected by a conductive member such as a conductive tape. Thereby, this invention is applied and the shield with respect to the sensor member laminated | stacked can be comprised.

  That is, the gist of the present invention is that a shield member such as a transparent conductive film is provided between a display element to be laminated and a sensor member, and the shield member and a conductive member (for example, a metal member) functioning as a ground member are electrically connected. A shield for the sensor member is formed by electrical connection with a conductive connection member such as rubber.

  In the above-described embodiment, the liquid crystal display element is used as the display element. However, the present invention is not limited to this. For example, the present invention can be applied even when a display element such as an organic EL (electroluminescence) display, a PDP (Plasma Display Panel), or a CRT (Cathode Ray Tube) is used.

  In the above-described embodiment, the sensor member 1 has been described as an electrostatic coupling type projection type indicator detection unit. However, the present invention is not limited to this. As the sensor member 1, it is possible to use various sensor members that are preferable to prevent mixing of noise, such as an electrostatic coupling surface type indicator detection unit.

  In the above-described embodiment, the conductive rubber or the conductive tape is used as the connection member. However, the present invention is not limited to this. The connecting member can be formed of various conductive materials that can electrically connect the shield member and the conductive member to be grounded.

  In the case of the pointer detection apparatus according to the above-described embodiment, since the shield members 2, 2 </ b> A, and 2 </ b> B are provided between the sensor member 1 and the display element 5, either the sensor member 1 or the display element 5 is used. In the event of a failure, it is easy to replace the failed one. Therefore, there is an advantage that the sensor member 1 and the display element 5 can be easily reused.

  DESCRIPTION OF SYMBOLS 1 ... Sensor member 2, 2A, 2B ... Shield member 3, 3a, 3b, 3c, 3d, 3B ... Connection member, 4 ... Conductive member, 5 ... Display element, 6, 6A, 6B ... Air gap or bonding ,

Claims (8)

A sensor member which is formed in a substantially flat plate shape, and one surface side is provided for indicating a position by an indicator;
A shield member disposed opposite to the other surface of the sensor member;
A substantially flat display element having a display region on one surface, the one surface being disposed to face the shield member;
A conductive member disposed opposite to the shield member and having electrical conductivity, which is electrically grounded;
A conductive connecting member disposed between the shield member and the conductive member to electrically connect the shield member and the conductive member;
An indicator detection apparatus comprising: The conductive member includes a first attachment portion for attaching the connection member at a position close to a peripheral portion of the display element.
The pointer detection apparatus according to claim 1. The conductive member further includes a second attachment portion for attaching the display element, and the first attachment portion is formed by extending from a peripheral portion of the second attachment portion toward the shield member. And
The connection member is provided at an end in the extending direction of the first attachment portion.
The pointer detection apparatus according to claim 2. The first attachment portion of the conductive member is formed along the outer periphery of the second attachment portion.
The pointer detection apparatus according to claim 3. The first attachment portion of the conductive member further includes a top portion formed by extending in a direction different from the extending direction of the first attachment portion,
The connecting member is provided on the top of the first mounting portion.
The pointer detection apparatus according to claim 4, wherein: The pointer detection apparatus according to claim 1, wherein the connection member is formed of an elastic member. The shield member is formed in a substantially plate shape, and the shield member and one surface of the sensor member are bonded.
The pointer detection apparatus according to claim 1, wherein the pointer detection apparatus is a pointer detection apparatus. The shield member includes a first surface portion formed in substantially the same shape as the one surface of the display element, and a second surface disposed between the top portion of the conductive member and the sensor member. With a face part,
Bonding the first surface portion of the shield member and the one surface of the display element,
The pointer detection apparatus according to claim 5.

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