JP6070289B2 - Touch screen and touch panel provided with the same - Google Patents

Description

  The present invention relates to a touch screen and a touch panel including the touch screen.

  Conventionally, a touch panel that detects a touch by an indicator such as a finger and specifies the coordinates of the touch position has attracted attention as one of excellent interface means. In this touch panel, various systems such as a resistive film system and a capacitive system have been proposed and commercialized.

  As one type of such a capacitive touch panel, for example, a projected capacitive touch panel is known. In this projected capacitive touch panel, even when the front side of the touch screen with a built-in touch sensor is covered with a protective plate such as a glass plate with a thickness of several millimeters, it detects touches with the finger on the protective plate. It is possible to do. Since such a touch screen has advantages such as being excellent in robustness, being capable of touch detection even when wearing gloves, and having a long life without moving parts, various technologies have been proposed. Yes.

  For example, a conventional projected capacitive touch panel has a first series of conductor elements formed of a thin conductive film as a detection wiring (detection electrode) for detecting capacitance, and a first series of touch elements. And a second series of conductor elements formed on the conductor elements via an insulating film. In addition, there is no electrical contact between the conductor elements, and a plurality of intersections are formed (see, for example, Patent Document 1). In such a touch panel, a detection circuit detects a capacitance formed between an indicator such as a finger and a conductor element that is a detection wiring, so that the position coordinate of the position touched by the indicator is obtained. Identified. Further, the touch position between the conductor elements can be interpolated by the detected capacitance relative value of one or more conductor elements.

  A touch screen used for another touch panel includes a detection column wiring and a detection row wiring, and these wirings are repeated in a zigzag pattern with inclined portions inclined at 45 ° in the column / row direction. It is formed from a pattern metal wiring. In such a touch screen, it is possible to improve the touch detection sensitivity by increasing the wiring density without increasing the parasitic capacitance between the detection wirings (see, for example, Patent Document 2).

  Further, the touch screen constituting another touch panel is provided with the detection column wiring and the detection row wiring formed in a zigzag pattern, as well as the detection column wiring and the detection row wiring. (See, for example, Patent Document 3).

  Also, a detection method called a mutual capacitance detection method different from the projection capacitive method is disclosed. For example, in a mutual capacitance detection type touch screen, a key matrix is composed of an array of a plurality of drive / receiver electrode pairs, and a coupled electrostatic capacity associated with a change in the electric field between electrodes caused by contact of a pointer such as a finger with a substrate. A change in capacitance (mutual electrode capacitance) is detected as a charge amount (see, for example, Patent Document 4).

  Another mutual capacitance detection type touch screen includes an electrode array including an X electrode and a Y electrode, and a mutual capacitance between the X electrode and the Y electrode is detected by a capacitance measurement circuit. And the output voltage change which shows the to-be-measured capacity | capacitance is determined according to the mutual capacity | capacitance, the known reference capacity | capacitance, and the known drive voltage change (for example, refer patent document 5).

  In the conventional touch screen having the above-described zigzag pattern detection column wiring and detection row wiring, the inter-wiring capacitance (hereinafter referred to as “matrix wiring capacitance” formed between the detection column wiring and the detection row wiring). ") Can be increased without increasing the wiring density. In addition, the detection wiring arranged in the rectangular shape has the advantage that the coordinate interpolation processing based on the detection result is easier than the detection wiring arranged in the diamond chain shape, or the coordinates obtained by the interpolation processing are Has the advantage of high linearity (especially in an oblique direction).

JP 9-51186 A JP 2010-61502 A JP 2010-97536 A Special table 2003-526831 gazette Japanese National Patent Publication No. 11-505641

  Depending on the detection method, the capacitance between the matrix wirings that changes depending on whether or not an indicator such as a finger touches the touch screen may be closely related to the detection sensitivity. For example, according to the conventional mutual capacitance detection method, the detection sensitivity can be increased as the change in the capacitance between the matrix wirings (change in the electric field between the electrodes) in response to the touch of an indicator such as a finger increases.

  However, in a configuration in which the capacitance (electric field coupling) between the column-direction bundle wiring and the row-direction bundle wiring is large, such as the conventional touch screen having the above-described zigzag pattern detection column wiring and detection row wiring. Further, an electric field change between the detection column wiring and the detection row wiring according to the touch of an indicator such as a finger, that is, a change in the matrix wiring capacitance is less likely to occur. Therefore, when the mutual capacitance detection method is applied in such a configuration, there is a problem that the touch detection sensitivity is low.

  In addition, when the mutual capacitance detection method is applied to a conventional touch screen having the above-described zigzag pattern detection column wiring and detection row wiring, the driving voltage is a mutual capacitance, that is, a matrix wiring capacitance and a known standard. A voltage divided by the capacitance is applied to the input of the differential amplifier. In particular, when the inter-matrix wiring capacitance is larger than the reference capacitance, the capacitance-divided voltage becomes too high, which is not desirable in consideration of the dynamic range of the circuit. At this time, it is conceivable to increase the reference capacity according to the inter-matrix line capacity, but the settling time of the detected output voltage becomes longer as the combined capacity of the detection wiring resistance, inter-matrix capacity and reference capacity is charged / discharged. As a result, there is a problem that the detection time is increased and the response of the touch panel is deteriorated.

The present invention has been made to solve the above-described problems. By reducing the capacitance between the column-direction bundle wiring and the row-direction bundle wiring, the response is improved by improving the detection sensitivity and shortening the detection time. It is an object of the present invention to obtain a touch screen capable of improving performance and a touch panel provided therewith.

The touch screen according to the present invention includes a plurality of column-direction bundle wirings each including a plurality of detection column wirings electrically connected in common with the column direction as a longitudinal direction, and electrically with the row direction as a longitudinal direction. Provided between a plurality of row-direction bundle wires, each of which is a set of a plurality of commonly connected row wires for detection, and between the detection column wires and the detection row wires in a plan view. A touch screen having row wirings and electrically disconnected floating wirings, wherein the detection column wirings are inclined at a predetermined inclination angle θ (0 <θ <90 °) with respect to the column direction. A zigzag pattern configured by repeatedly arranging a first inclined portion and a second inclined portion inclined obliquely at an inclination angle of −θ with respect to the row direction connected to the first inclined portion along the row direction. The row wiring for detection is predetermined in the row direction A third inclined portion inclined obliquely at an inclination angle of 90 ° -θ, and a fourth inclined portion inclined obliquely at an inclination angle of-(90 ° -θ) with respect to the row direction connected to the third inclined portion. A zigzag pattern configured by being repeatedly arranged along the row direction, and the first unit wiring pattern including the detection column wiring is arranged in a tilt angle θ or −θ direction with respect to the column direction in plan view. And a third unit wiring pattern including floating wirings connected to each other and formed in the same wiring layer as the detection column wiring, and a fourth unit including floating wiring formed in the same wiring layer as the detection row wiring. Are arranged around the connection point between the first inclined portion and the second inclined portion, and the second unit wiring pattern including the detection row wiring is provided. Inclination angle 90 ° -θ with respect to row direction Are arranged in the − (90 ° −θ) direction and are connected to each other, and the third unit wiring pattern including the floating wiring formed in the same wiring layer as the detection column wiring and the same wiring as the detection row wiring The fourth unit wiring pattern including the floating wiring formed in the layer is arranged around the connection point between the first inclined portion and the second inclined portion, and the second block region is arranged in the column direction and They are arranged alternately in the row direction.

  In the touch screen according to the present invention, the first block area including the detection column wiring and the second block area including the detection row wiring are alternately arranged in the column direction and the row direction, and the first block A non-connected floating wiring is arranged between the detection column wiring and the detection row wiring in the region and the second block region. As a result, the distance between the detection column wiring and the detection row wiring in the adjacent block region is increased, and the electric field coupling between the detection column wiring and the detection row wiring is reduced, and each wiring is configured. The inter-wiring capacitance between the column-direction bundle wiring and the row-direction bundle wiring can be reduced. As a result, it is possible to obtain a touch screen with improved responsiveness by improving detection sensitivity and shortening detection time.

3 is a plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 1. FIG. 1 is a perspective view showing a configuration of a touch screen according to Embodiment 1. FIG. 1 is a perspective view showing a configuration of a touch screen according to Embodiment 1. FIG. 2 is a diagram showing a configuration of a touch panel according to Embodiment 1. FIG. 3 is an enlarged plan view showing a configuration of a contrast touch screen according to Embodiment 1. FIG. 3 is a schematic plan view showing a block configuration of a touch screen according to Embodiment 1. FIG. 3 is a schematic plan view showing a block configuration of a touch screen according to Embodiment 1. FIG. 5 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 2. FIG. 10 is an enlarged plan view showing a configuration of a touch screen according to Embodiment 3. FIG.

Embodiment 1 FIG.
FIG. 1 is a plan view schematically showing a configuration of a touch screen 1 according to Embodiment 1 for carrying out the present invention. Hereinafter, the configuration and the like of the touch screen 1 according to the present embodiment will be described with reference to FIG. 1 and the like.

  As shown in FIG. 1, the touch screen 1 includes a base substrate 12 that is a transparent substrate made of a transparent glass material or a transparent resin, and a plurality of extending in the column direction (corresponding to the y direction in FIG. 1). A detection column wiring 2 and a plurality of detection row wirings 3 extending in the row direction (corresponding to the x direction in FIG. 1) are provided. The plurality of detection column wirings 2 are formed on the surface of the base substrate 12, and the plurality of detection row wirings 3 are formed on the surface of the insulating layer formed on the plurality of detection column wirings 2. Here, the formation positions of the plurality of detection column wirings 2 and the plurality of detection row wirings 3 may be interchanged. In FIG. 1, for the sake of convenience, the detection column wiring 2 and the detection row wiring 3 are shown as straight lines, but actually have a zigzag shape as shown in FIG. Details of the detection column wiring 2 and the detection row wiring 3 will be described later.

  The plurality of detection column wirings 2 are electrically connected in common by connection wirings 4 or the like. In the present embodiment, a plurality of detection column wirings 2 electrically connected in common are included in the column direction bundle wiring 6 extending in the column direction (y direction). That is, the column direction bundle wiring 6 includes a plurality of detection column wirings 2 that are electrically connected in common. Such a column-direction bundle wiring 6 forms a rectangular detection region whose longitudinal direction is the column direction. In the above description, the detection column wiring 2 extends in the column direction (y direction). However, the present invention is not limited to this, and even if the wiring does not extend in the column direction (y direction) Any wiring that constitutes the direction bundle wiring 6 is referred to as a detection column wiring 2.

  Similarly, the plurality of detection row wirings 3 are electrically connected in common by connection wirings 5 or the like. In the present embodiment, a plurality of detection row wirings 3 electrically connected in common are included in the row direction bundle wiring 7 extending in the row direction (x direction). That is, the row direction bundle wiring 7 includes a plurality of detection row wirings 3 electrically connected in common. Such row-direction bundle wiring 7 forms a rectangular detection region whose longitudinal direction is the row direction. In the above description, the detection row wiring 3 extends in the row direction (x direction). However, the present invention is not limited to this, and even if the wiring does not extend in the row direction (x direction), the row A wiring constituting the directional bundle wiring 7 is called a detection row wiring 3.

  As shown in FIG. 1, the plurality of column-direction bundle wires 6 and the plurality of row-direction bundle wires 7 are arranged in parallel to the column direction (y direction) and the row direction (x direction), that is, arranged in a matrix. . Note that the number of column-direction bundle wires 6 and row-direction bundle wires 7, the number of detection column wires 2 constituting each column-direction bundle wire 6, and the number of detection row wires 3 constituting each row-direction bundle wire 7 are respectively shown. From the required resolution of the touch position (touch coordinate value) of an indicator such as a finger on the touch panel, it is appropriately selected and set.

  The column-direction bundle wiring 6 and the row-direction bundle wiring 7 are respectively connected to terminals 10 provided at the end of the base substrate 12 by lead-out wirings 8 and 9, respectively.

  In the touch screen 1 configured as described above, the wiring density of the detection column wiring 2 and the detection row wiring 3 can be increased. Therefore, in the detection method (generally called the self-capacitance detection method) for detecting the electrostatic capacitance (touch capacitance) formed between the indicator and each of the column-direction bundle wiring 6 and the row-direction bundle wiring 7 The touch capacity to be increased can be increased.

  Next, the configuration of the column-direction bundle wiring 6 and the row-direction bundle wiring 7 will be described in detail.

  FIG. 2 shows, in plan view, a column-direction bundle wiring 6 that forms a rectangular detection region whose longitudinal direction is the column direction, and a row-direction bundle wiring 7 that forms a rectangular detection region whose longitudinal direction is the row direction. It is the figure which expanded the area | region where and intersects. More specifically, FIG. 2 is an enlarged view of a part of an intersecting area A indicated by a thick broken line in FIG. FIG. 2 is an enlarged view of a region where one detection column wiring 2 constituting the column direction bundle wiring 6 and one detection row wiring 3 constituting the row direction bundle wiring 7 intersect. In the following description, a region obtained by enlarging a part of the intersecting region A may be referred to as “grid B”. In the following drawings, the detection column wiring 2 may be indicated by a broken line and the detection row wiring 3 may be indicated by a solid line.

  In FIG. 2, the detection column wiring 2 has a first inclined portion inclined obliquely at an inclination angle of 45 ° with respect to the column direction (y direction), and an inclination angle − with respect to the column direction connected to the first inclined portion. The second inclined portion inclined obliquely at 45 ° is constituted by a zigzag pattern configured by being repeatedly arranged along the column direction. In addition, the detection row wiring 3 has a third inclined portion inclined obliquely at an inclination angle of 45 ° with respect to the row direction (x direction), and an inclination angle of −45 with respect to the row direction connected to the third inclined portion. The zigzag pattern is formed by repeatedly arranging the fourth inclined portion inclined obliquely in the row direction along the row direction.

  In the touch screen 1 according to the present embodiment, a plurality (four in this case) of quadrangular shapes indicated by thin alternate long and short dashed lines obtained by dividing the intersecting region B (grid B) indicated by the thick alternate long and short dashed lines in FIG. Block areas C1 and C2 (first block areas) and R1 and R2 (second block areas) are defined.

  Here, in the grid B, the block area C1 is arranged on the upper left side (−x side and −y side), the block area C2 is arranged on the lower right side (+ x side and + y side), and the block area R1 is located on the upper right side. The block region R2 is disposed on the lower left side (−x side and + y side).

  The block regions C1 and C2 are block regions around a connection point between the first inclined portion and the second inclined portion of the detection column wiring 2, and the block regions R1 and R2 are the first of the detection row wiring 3. It is a block area | region around the connection point of 3 inclination part and 4th inclination part.

  In the present embodiment, such block regions C1, C2, R1, and R2 are defined over all of the column-direction bundle wiring 6 and the row-direction bundle wiring 7. That is, the block areas C1 and C2 (first block areas) and the block areas R1 and R2 (second block areas) are alternately arranged as a whole in the column direction y and the row direction x, and the checker pattern Is made.

  FIG. 3 shows the grid B in the present embodiment as in FIG. In FIG. 3, a broken-line circle at the center indicates a location D where four block regions (C1, C2, R1, and R2) are adjacent to each other at the center of the grid B. In FIG. 3, broken triangles at the center of both left and right sides indicate the locations where the block areas C1 and R2 of the grid B are in contact with the block areas R1 and C2 adjacent to the left side (−x side) and the grid B The block region C2 and R1, and the block region R2 and C1 adjacent to the right side (+ x side) of the block region C2 and R1 are shown. Further, in FIG. 3, a broken-line rectangle at the center of the upper and lower ends of the grid B is a place where the block areas C1 and R1 of the grid B and the block areas R2 and C2 adjacent to the upper side (−y side) are in contact with each other; , A location F where the block regions C2 and R2 of the grid B and the block regions R1 and C1 adjacent to the lower side (+ y side) thereof are in contact with each other is shown. Further, in FIG. 3, the four corners of the grid B are shown as solid circles O1 to O4.

  In one grid B, one detection column wiring 2 that obliquely connects the block areas C1 and C2 that are diagonally adjacent to each other, and one that diagonally connects the block areas R1 and R2 that are diagonally adjacent to each other in a complementary manner. The detection row wiring 3 of the book is configured to cross three-dimensionally. Then, in one grid B, a three-dimensional intersection between the detection column wiring 2 and the detection row wiring 3 is represented by one point D (block regions C1, C2, R1 and R2 are indicated by broken-line circles shown in FIG. It is provided only at one place in contact.

  Further, in a plan view, in a region where the detection column wiring 2 and the detection row wiring 3 are not formed, as described later, the same wiring layer as the detection column wiring 2 (hereinafter referred to as the same layer) is provided. A floating wiring 2F (first floating wiring) formed as wiring and a floating wiring 3F (second floating wiring) formed as wiring in the same layer as the detection row wiring 3 are provided.

  4 is an enlarged view of a portion D indicated by a broken-line circle in FIG. As shown in FIG. 4, at a portion D with a broken-line circle, one detection column wiring 2 in the block region C1 and one detection column wiring 2 in the block region C2 are connected. In addition, one detection row wiring 3 in the block region R1 and one detection row wiring 3 in the block region R2 are connected.

  FIG. 5 is an enlarged view of a portion E indicated by a broken-line triangle in FIG. As shown in FIG. 5, at a location E with a dashed triangle, one detection row wiring 3 in the block region R1 and one detection row wiring 3 in the block region R2 are connected. However, the detection column wiring 2 in the block region C1 and the detection column wiring 2 in the block region C2 are arranged so as to sandwich the connecting portion and are not connected.

  FIG. 6 is an enlarged view of a portion F indicated by a broken-line rectangle in FIG. As shown in FIG. 6, at a location F with a broken-line rectangle, one detection column wiring 2 in the block region C1 and one detection column wiring 2 in the block region C2 are connected. However, the detection row wiring 3 in the block region R1 and the detection row wiring 3 in the block region R2 are arranged so as to sandwich the connection portion and are not connected.

  FIG. 7 is an enlarged view of one of O1 to O4 shown by a solid circle in FIG. As shown in FIG. 7, the detection column wirings 2 in the block areas C1 and C2 are spaced apart from each other at the locations O1 to O4 with solid circles, and the block area R1. , R2 detection row wirings 3 are separated from each other and disconnected.

  Next, the configuration of the detection column wiring 2 provided in the block areas C1 and C2 will be described.

  8 and 9 are enlarged views showing the configuration of the detection column wiring 2 provided in the block regions C1 and C2, respectively. As shown in FIGS. 8 and 9, in the block areas C1 and C2, unit wiring patterns 2u formed of the detection column wirings 2 are connected in the diagonal direction of the block areas C1 and C2, respectively. Further, a unit wiring pattern 2Fu composed of the floating wiring 2F formed in the same layer as the detection column wiring 2 and a unit wiring pattern 3Fu composed of the floating wiring 3F formed in the same layer as the detection row wiring 3 are provided. Including. The laminated structure of each wiring will be described later.

  Next, the configuration of the detection row wiring 3 provided in the block regions R1 and R2 will be described.

  FIGS. 10 and 11 are enlarged views showing the configuration of the detection row wiring 3 provided in the block regions R1 and R2, respectively. As shown in FIGS. 10 and 11, in the block regions R1 and R2, unit wiring patterns 3u formed of the detection row wirings 3 are connected to the diagonal directions of the block regions R1 and R2, respectively. Further, a unit wiring pattern 3Fu composed of the floating wiring 3F formed in the same layer as the detection row wiring 3 and a unit wiring pattern 2Fu composed of the floating wiring 2F formed in the same layer as the detection column wiring 2 are provided. Including. The laminated structure of each wiring will be described later.

  12A is an enlarged view showing the configuration of the unit wiring pattern 2u of the detection column wiring 2, and FIG. 12B is an enlarged view showing the configuration of the unit wiring pattern 2Fu of the floating wiring 2F. The unit wiring pattern shown in FIG. 12A is a set of two sets of apexes (P1, P2) and (Q1, Q2) in a square unit wiring pattern region (indicated by a one-dot chain line in the figure). An oblique wiring 2j having a start point and an end point in the vicinity of the vertex (P1, P2), and an oblique wiring 2k having a start point and an end point in the vicinity of the other pair of vertices (Q1, Q2), respectively, are connected at the connecting portion J2 of the intersection. (Connected). Further, the diagonal wirings 2j and 2k are connected by a branch wiring 2e including the inclined portion portions 2eS1 to 2eS4 and the connecting portion 2eP. The branch wiring 2e is arranged in a substantially rhombus shape as a whole, and each inclined portion of the branch wiring 2e is orthogonal to one of the diagonal wirings 2j and 2k.

  The unit wiring pattern 2u of the detection column wiring 2 is connected to another unit wiring pattern 2u at the end of the diagonal wiring 2j or 2k. In this way, as shown in FIGS. 8 and 9, in the block areas C1 and C2, the unit wiring patterns 2u formed of the detection column wirings 2 are connected in the diagonal direction of the block areas C1 and C2, respectively. The

  The unit wiring pattern shown in FIG. 12B is similarly configured. That is, one pair of vertices (PF1, PF2) out of two pairs of vertices (PF1, PF2) and (QF1, QF2) forming a diagonal of a square unit wiring pattern region (indicated by a one-dot chain line in the figure). ) The diagonal wiring 2Fj having the vicinity as the start point and the end point and the diagonal wiring 2Fk having the vicinity of the vertex (QF1, QF2) of the other set as the start point and the end point are connected (connected) at the connecting portion JF2. . Further, the diagonal wirings 2Fj and 2Fk are connected by a branch wiring 2Fe composed of the inclined portion portions 2FeS1 to 2FeS4 and the connecting portion 2FeP.

  The unit wiring pattern 2Fu of the floating wiring 2F is equivalent in structure to the unit wiring pattern 2u of the detection column wiring 2, but is connected to any other unit wiring pattern at the end of the diagonal wiring 2Fj or 2Fk. There is no electrical floating state.

  13A is an enlarged view showing the configuration of the unit wiring pattern 3u of the detection row wiring 3, and FIG. 13B is an enlarged view showing the configuration of the unit wiring pattern 3Fu of the floating wiring 3F. These unit wiring patterns are also the same in configuration as the unit wiring pattern 2u of the detection column wiring 2 and the unit wiring pattern 2Fu of the floating wiring 2F shown in FIG. That is, in the unit wiring pattern 3u, two diagonal wirings 3j and 3k starting from the vertices (T1, T2) and (U1, U2) are included, and in the unit wiring pattern 3Fu, the vertices (TF1, TF2). ), Two diagonal wirings 3Fj and 3Fk starting from (UF1, UF2) and ending points are connected at intersections J3 and JF3, respectively. The diagonal wirings 3j and 3k are connected by a branch wiring 3e, and the diagonal wirings 3Fj and 3Fk are connected by a branch wiring 3Fe.

  The unit wiring pattern 3u of the detection row wiring 3 is connected to another unit wiring pattern 3u at the end of the diagonal wiring 3j or 3k. On the other hand, the unit wiring pattern 3Fu of the floating wiring 3F has a structure equivalent to the unit wiring pattern 3u formed of the detection column wiring 2, but is connected to any other unit wiring pattern at the end of the diagonal wiring 3j or 3k. Without being in an electrically floating state.

  Further, by providing the branch wirings 2e and 3e, when disconnection occurs in the detection column wiring 2 and the detection row wiring 3 in the unit wiring patterns 2u and 3u, the column-direction bundle wiring 6 and the row constituted by them are formed. It is possible to suppress an increase in the resistance of the direction bundle wiring 7.

  As shown in FIGS. 8 and 9, in the block areas C <b> 1 and C <b> 2, the unit wiring pattern 2 u including the detection column wiring 2 is connected in the diagonal direction of the block area. Then, the main wiring of the detection column wiring 2 in which a part of the diagonal wirings 2j and 2k of the connected unit wiring pattern 2u extends in the diagonal direction of the block areas C1 and C2 and is connected at the connection point Jc in the center of the block area. 2g and 2h.

  At this time, in the block area C1, the main wirings 2g and 2h of the detection column wiring 2 are respectively connected to the connection point Jc1 at the upper right end (+ x side + y side end) of the block area and the lower right end of the block area (+ x It extends to the connecting point Jc2 at the apex of the (side-y side end).

  Similarly, in the block region C2, the main wirings 2g and 2h of the detection column wiring 2 are respectively connected to the connection point Jc2 at the top of the upper left end (−x side + y side end) of the block region and the lower left end of the block region ( It extends to the connecting point Jc1 at the apex of (−x side−y side end).

  One of the block regions C1 and C2 is electrically connected to the other block region that is adjacent in the diagonally up and down direction and its connection points Jc1 and Jc2 to connect the main wirings 2g and 2h. Connected.

  In this way, the detection column wirings 2 in the block regions C1 and C2 constitute the column-direction bundle wiring 6 extending in the column direction while the main wirings 2g and 2h are connected at the connection points Jc1 and Jc2. .

  Here, between the unit wiring patterns 2u connected in the diagonal direction of the block regions C1 and C2, a unit wiring pattern 2Fu composed of a floating wiring 2F that is the same layer wiring as the detection column wiring 2 and a detection row. Unit wiring patterns 3Fu composed of floating wirings 3F which are the same layer wirings as the wirings 3 are alternately arranged. Note that the unit wiring patterns 2Fu and 3Fu made of the floating wirings 2F and 3F, respectively, are in an electrically floating state as described above.

  In the block regions C1 and C2, the unit wiring patterns 2u and 2Fu made of the same layer wiring and the unit wiring patterns 3Fu made of the floating wiring which are different layer wirings are arranged alternately (complementarily). The unit wiring patterns of the same layer wiring are arranged in a checker pattern.

  As shown in FIGS. 10 and 11, also in the block regions R1 and R2, the unit wiring pattern 3u composed of the detection row wiring 3 is connected in the diagonal direction of the block region. Then, a part of the diagonal wiring of the connected unit wiring pattern 3u extends in the diagonal direction of the block regions R1 and R2, and the main wirings 3g and 3h of the detection row wiring 3 connected at the connection point Jr in the center of the block region. It becomes.

  At this time, in the block region R1, the main wirings 3g and 3h of the detection row wiring 3 are the connection point Jr1 at the vertex of the lower left end (−x side−y side end) of the block region and the lower right end of the block region, respectively. It extends to the connecting point Jr2 at the apex of (+ x side-y side end).

  Similarly, in the block region R2, the main wirings 3g and 3h of the detection row wiring 2 are respectively connected to the connection point Jr2 at the top of the upper left end (−x side + y side end) of the block region and the upper right end of the block region ( It extends to the connecting point Jr1 at the apex of the (+ x side + y side end).

  One of the block regions R1 and R2 is electrically connected to the other block region that is adjacent in the diagonally left-right direction and its connection points Jr1 and Jr2 with the main wirings 3g and 3h. Connected.

  In this way, the detection row wirings 3 in the block regions R1 and R2 constitute the row-direction bundle wirings 7 extending in the row direction while the main wirings 3g and 3h are connected at the connection points Jr1 and Jr2. .

  Here, similarly to the block regions C1 and C2, the unit wiring pattern 3u connected in the diagonal direction of the block regions R1 and R2 is composed of the floating wiring 3F which is the same layer wiring as the detection row wiring 3. Unit wiring patterns 3Fu and unit wiring patterns 2Fu composed of floating wirings 2F that are the same layer wiring as the detection column wirings 2 are alternately arranged. Note that the unit wiring patterns 2Fu and 3Fu made of the floating wirings 2F and 3F, respectively, are in an electrically floating state as described above.

  In the block regions R1 and R2, the unit wiring patterns 3u and 3Fu made of the same layer wiring and the unit wiring patterns 2Fu made of the floating wiring which are different layer wirings are arranged alternately (complementarily). The unit wiring patterns of the same layer wiring are arranged in a checker pattern.

  Here, the unit wiring patterns 2, 2u and the unit wiring patterns 3, 3u are wirings in different wiring layers. Therefore, even if the wiring patterns are equivalent, the wiring width of the detection column wiring 2 and the wiring width of the detection row wiring 3 are slightly different due to, for example, manufacturing restrictions. For this reason, when a combination of the width of the detection column wiring 2 formed in another wiring layer and the detection row wiring 3 is used, the transmittance for the display light from the display device and the reflection for the external light. There may be a difference in the wavelength spectrum of transmitted light and reflected light. For this reason, when the area | region which consists of a unit pattern which consists of wiring of the same layer becomes large, the problem that the difference of lightness and coloring with the area | region of a different wiring layer will be visually recognized as a pattern will arise.

  Therefore, in the present embodiment, in the blocks C1 and C2, the unit wiring patterns 2u and 2Fu made of the same layer wiring and the unit wiring pattern 3Fu made of the floating wiring which is a different layer wiring are alternately arranged. Place (complementarily). In the blocks R1 and R2, unit wiring patterns 3u and 3Fu made of the same-layer wiring and unit wiring patterns 2Fu made of floating wiring that are different from those are alternately arranged (complementarily). . As a result, by arranging the unit wiring patterns of the same layer wiring in a checker pattern, it is possible to increase the spatial frequency (the number of repetitions) of the above-described shade pattern or colored pattern and make it difficult to see. be able to.

  In addition, each wiring pattern composed of the unit wiring patterns 2u, 2Fu, and 3Fu in the block regions C1 and C2 has a point-symmetric relationship with respect to the connection point Jc at the center of the block. Similarly, in the block regions R1 and R2, each wiring pattern has a point-symmetric relationship with respect to the connection point Jr at the center of the block.

  FIG. 14 is a perspective view schematically showing an example of a laminated structure of the touch screen 1 according to the present embodiment. In FIG. 14, illustration of the lead wires 8 and 9 and the terminals 10 shown in FIG. 1 is omitted. Next, the laminated structure of the touch screen 1 will be described with reference to FIG.

  As shown in FIG. 14, the upper surface layer of the touch screen 1 is the base substrate 12 described above, and an opaque and highly conductive metal wiring material such as aluminum is formed on the base substrate 12 (on the lower surface in FIG. 14). A plurality of detection column wirings 2 and floating wirings 2F are formed as wirings in the same layer. In FIG. 14, for the sake of convenience, the detection column wiring 2 and the floating wiring 2F are not shown to have the above-described diagonal pattern or the like, but are shown as straight lines.

  A transparent interlayer insulating film 13 such as a silicon nitride film or a silicon oxide film is formed on the base substrate 12 (on the lower surface in FIG. 14) so as to cover all the detection column wirings 2 and the floating wirings 2F. A plurality of detection row wirings 3 and floating wirings 3F made of an opaque and high conductivity metal wiring material such as aluminum are formed on the interlayer insulating film 13 (on the lower surface in FIG. 14). In FIG. 14, for the sake of convenience, the detection row wiring 3 and the floating wiring 3F are not shown to have the above-described diagonal pattern or the like, but are shown as straight lines. A protective film 14 for protecting the row-direction bundle wiring 7 is formed on the interlayer insulating film 13 (on its lower surface in FIG. 14).

  Here, a configuration in which the interlayer insulating film 13 is formed after the detection column wiring 2 and the floating wiring 2F are formed on the base substrate 12, and the detection row wiring 3 and the floating wiring 3F are further formed thereon is described. However, the arrangement of the wirings is reversed, that is, the detection row wiring 3 and the floating wiring 3F are formed on the base substrate 12, and then the interlayer insulating film 13 is formed. The structure which formed the floating wiring 2 may be sufficient.

  FIG. 15 is a perspective view schematically showing an example of a laminated structure different from the touch screen 1 shown in FIG. The touch screen 1 shown in FIG. 15 is shown upside down with respect to the touch screen 1 shown in FIG. Here, the protective glass 16 is adhesively fixed on the protective film 14 via the adhesive layer 15. In addition, if the thickness of the protective glass 16 is about several millimeters, the strength of the touch screen 1 can be improved, and the touch screen 1 having excellent robustness can be obtained.

  FIG. 16 is a diagram schematically showing an overall configuration of touch panel 100 including touch screen 1 according to the present embodiment. In addition to the touch screen 1 described above, the touch panel 100 includes an FPC (Flexible Printed Circuit) 17, a controller board 18, a switch circuit 19 mounted on the controller board 18, and a detection processing circuit 20.

  Each terminal of the FPC 17 is mounted on the corresponding terminal 10 of the touch screen 1 by using an ACF (Anisotropic Conductive Film) or the like (not shown). Via this FPC 17, the detection wiring group (column-direction bundle wiring 6 and row-direction bundle wiring 7) of the touch screen 1 and circuits such as the switch circuit 19 and the detection processing circuit 20 mounted on the controller board 18 are electrically connected. Connected. Thereby, the touch screen 1 functions as a main component of the touch panel 100.

  The switch circuit 19 sequentially selects each of the plurality of column-direction bundle wirings 6 and each of the plurality of row-direction bundle wirings 7. The detection processing circuit 20 detects touch coordinates on the touch screen 1 that indicate the touch position of the indicator that has touched the touch screen 1.

  Here, as a method of detecting the touch coordinates of the indicator, a self-capacitance detection method and a mutual capacitance detection method can be considered.

  In the self-capacitance detection method, when the indicator touches the surface of the transparent base substrate 12 of the touch screen 1 (when the laminated structure of FIG. 14 is used), or touches the surface of the protective glass 16 (FIG. 15). In the case of a stacked structure), a touch capacitance formed between each detection column wiring 2 and the indicator and a touch capacitance formed between each detection row wiring 3 and the indicator are detected. Thus, touch coordinates are detected.

  Therefore, when it is desired to realize detection by the self-capacitance detection method, the capacitance formed between the column-direction bundle wiring 6 selected by the switch circuit 19 and the indicator, and the switch circuit 19 The detection processing circuit 20 may be a circuit that can perform the touch coordinate calculation processing of the indicator based on the detection result of the capacitance formed between the row-direction bundle wiring 7 and the indicator. . Then, the touch coordinate value calculated by the detection processing circuit 20 may be output as detection coordinate data to an external device (for example, a computer) (not shown).

  On the other hand, in the mutual capacitance detection method, when the indicator touches the surface of the transparent base substrate 12 of the touch screen 1 (when the laminated structure shown in FIG. 14 is used) or touches the surface of the protective glass 16 (see FIG. 14). The touch coordinates are detected by detecting a change in mutual capacitance between the detection column wiring 2 and the detection row wiring 3 at the touch position, which occurs in the case of 15 stacked structures).

  Therefore, when it is desired to realize detection by the mutual capacitance detection method, the column-direction bundle wiring 6 and the row-direction bundle wiring 7 selected by the switch circuit 19 according to the touch of the indicator on the touch screen 1 are used. A circuit that can perform the touch coordinate calculation processing of the indicator based on the detection result of the mutual capacitance change may be the detection processing circuit 20. Then, the touch coordinate value calculated by the detection processing circuit 20 may be output as detection coordinate data to an external device (for example, a computer) (not shown).

  In the above description, the number of block areas provided with the detection column wiring 2 and the number of block areas provided with the detection row wiring 3 in the grid B are set to two. The number of block areas is not limited to the number, and a considerable effect can be obtained.

  Next, the effect of the touch screen of this embodiment will be described. First, a conventional touch screen (hereinafter referred to as a contrast touch screen) for comparison with the touch screen of the present embodiment will be described.

  FIG. 17 is an enlarged view (plan view) of a region where the rectangular column-direction bundle wiring 6 and the rectangular row-direction bundle wiring 7 of the contrast touch screen according to the present embodiment intersect. In FIG. 17, each of the block regions C1 and C2 is provided with a detection column wiring 2 and a floating wiring 3F formed in the same wiring layer as the row-direction bundle wiring 7 (detection row wiring 3). The floating wiring 3F is a wiring of the same wiring layer as the detection row wiring 3, but does not constitute a part of the row direction bundle wiring 7, and is not connected to the column direction bundle wiring 6 and the row direction bundle wiring 7. That is, it is in a floating state.

  Each of the block regions R1 and R2 is provided with a detection row wiring 3 and a floating wiring 2F formed in the same wiring layer as the column-direction bundle wiring 6 (detection column wiring 2). The floating wiring 2F is a wiring of the same wiring layer as the detection column wiring 2, but does not constitute a part of the column-direction bundle wiring 6, and is not connected to the column-direction bundle wiring 6 and the row-direction bundle wiring 7. That is, it is in a floating state.

  Furthermore, the block areas C1 and C2 in which the detection column wiring 2 is provided and the block areas R1 and R2 in which the detection row wiring 3 is provided are alternately arranged in the column direction y and the row direction x as a whole. It has a checkered pattern.

  Now, the touch screen in this embodiment is compared with the contrast touch screen. FIG. 18 is a schematic plan view showing a block configuration of the touch screen and the contrast touch screen of the present embodiment. In FIG. 18, a black square is a region having a unit wiring pattern of a detection column wiring, a black circle is a region having a unit wiring pattern of a detection row wiring, and a diamond is a unit of a floating wiring on the same layer as the detection column wiring. A region having a wiring pattern and a triangle indicate a region having a unit wiring pattern of a floating wiring in the same layer as the detection row wiring.

  As shown in FIG. 18, in the touch screen of the present embodiment, block regions C1, C2, R1, and R2 are described as having seven unit wiring patterns in the row direction and the column direction, respectively. FIG. 18A shows a comparative touch screen, and FIG. 18B shows unit wiring patterns (13 per block area) including only detection column wirings in the diagonal direction of the block areas C1 and C2, and block areas R1, This is a case where unit wiring patterns (13 per block area) including only detection row wirings are arranged in the diagonal direction of R2. 18C further shows a unit wiring pattern including only one detection column wiring by skipping one unit vertically and horizontally from the unit wiring pattern at the center position of the block regions C1 and C2 with respect to FIG. (17 per block area) are arranged, and a unit wiring pattern including only one detection row wiring (each per block area) by jumping up and down and left and right from the unit wiring pattern at the center position of the block areas R1 and R2 17).

  Next, FIG. 19 is a schematic plan view showing a block configuration of the intersecting region A shown in FIG. 1 in the present embodiment. As shown in FIG. 19, the intersection area A of the touch screen of the present embodiment forms a checker pattern in which blocks C and R are alternately arranged.

As shown in FIG. 18, unit wiring patterns are arranged in each block. Further, as shown in FIG. 19, five intersection regions A of the column direction bundle wiring 6 and the row direction bundle wiring 7 are arranged in the row direction and the column direction, respectively. Consider the case where the block is composed of
The contrast touch screen shown in FIG. 19 with the block configuration shown in FIG. 18A and the crossing region A shown in FIG. 19 with the block configuration shown in FIGS. 18B and 18C. The inter-wiring capacitance between the column-direction bundle wiring 6 and the row-direction bundle wiring 7 was compared by calculation with the touch screen of this embodiment configured as described above. The calculation conditions were as follows: each wiring width: 3 μm, unit wiring pattern size: 230 μm, column width bundle wiring and row direction bundle wiring width: about 8 mm. Moreover, the thickness of the protective glass 16 mentioned later based on FIG. 18 was 1.8 mm.

  The inter-wire capacitance between the column-direction bundle wiring 6 and the row-direction bundle wiring 7 is reduced by about 50% in the touch screen using the configuration shown in FIG. In the touch screen using the configuration shown in FIG. 18C, a calculation result of about 30% reduction was obtained.

  This is because the distance between the unit wiring pattern consisting of the detection column wiring and the unit wiring pattern consisting of the detection row wiring is separated between adjacent blocks, and the unit wiring pattern consisting of the floating wiring between them. This is because the electric field coupling between the adjacent blocks is lowered because all of are connected to the adjacent unit wiring pattern (not connected).

  On the other hand, even if the number of unit wiring patterns (pattern density) composed of the detection column wiring and the detection row wiring is reduced to the extent shown in FIG. 6 or a calculation result that the capacitance (touch capacitance) formed between the row-direction bundle wirings 7 is only about 10% lower was obtained (the touch area by an indicator such as a finger is φ5 mm) Calculated as a circle).

  That is, for the contrast touch screen, for example, in the touch screen using the configuration of FIG. 18B, the inter-wiring capacity between the column-direction bundle wiring 6 and the row-direction bundle wiring 7 is reduced to about 50%. A calculation result was obtained that the touch capacitance detected was only reduced by about 10%.

  As described above, according to the touch screen 1 and the touch panel 100 according to the present embodiment, the block regions C1 and C2 (first block region) including the detection column wiring 2 and the block including the detection row wiring 3 are included. The regions R1, R2 (second block regions) are alternately arranged in the column direction y and the row direction x, and the block regions C1, C2 (first block region) and the block regions R1, R2 (first block) The floating wirings 2F and 3F which are not connected to the detection column wiring 2 and the detection row wiring 3 are arranged between the regions). As a result, the distance between the detection column wiring 2 and the detection row wiring 3 in the adjacent block region is increased, and the electric field coupling between the detection column wiring 2 and the detection row wiring 3 is reduced. It is possible to reduce the inter-wiring capacity between the column-direction bundle wiring 6 and the row-direction bundle wiring 7 constituted by the wiring. As a result, it is possible to obtain a touch screen with improved responsiveness by improving detection sensitivity and shortening detection time.

  Further, in the present embodiment, the intersection between the detection column wiring 2 and the detection row wiring 3 is complementary to the detection column wiring 2 that diagonally connects the block regions C1 and C2 that are diagonally adjacent to each other. The detection row wiring 3 that connects diagonally between the block regions R1 and R2 that are diagonally adjacent to each other is only at a location where they intersect. Thereby, compared with the conventional touch screen, the number of intersections between the detection column wiring and the detection row wiring can be reduced, and the inter-wiring capacitance between the column-direction bundle wiring 6 and the row-direction bundle wiring 7 is reduced. be able to.

  Further, in the block areas C1 and C2, unit wiring patterns 2u composed of the detection column wirings 2 are arranged in the diagonal direction, and the respective unit wiring patterns 2u are arranged in the vicinity of the apexes of the unit wiring patterns 2u adjacent in the diagonal direction. The column wirings for detection 2 are electrically connected to each other, and in the block regions R1 and R2, unit wiring patterns 3u composed of the row wirings for detection 3 are arranged in the diagonal direction, and unit wiring patterns adjacent to each other in the oblique direction are arranged. In the vicinity of the vertex of 3u, the detection row wirings 3 of each unit wiring pattern 3u are electrically connected. Thus, the distance between the detection column wiring 2 and the detection row wiring 3 in the adjacent block region is separated, and the electric field coupling between the detection column wiring 2 and the detection row wiring 3 is reduced, It is possible to reduce the inter-wiring capacity between the column-direction bundle wiring 6 and the row-direction bundle wiring 7 composed of the above-mentioned wirings.

  Further, the unit wiring patterns 2u and 2F and the unit wiring pattern 3F in the block regions C1 and C2 are formed such that the wirings included in the unit wiring patterns adjacent to each other in the diagonal direction are formed as wirings in the same wiring layer. Further, the unit wiring patterns 3u, 3Fu and the unit wiring pattern 2F of the block regions R1, R2 that are alternately arranged in the column direction and the row direction have the same wiring included in the unit wiring patterns that are complementarily adjacent in the oblique direction. They are alternately arranged in the column direction and the row direction so as to be formed as wiring in the wiring layer. As a result, even if basic wiring patterns of different wiring layers are arranged in a checkered pattern and a difference in shading or coloring occurs between different wiring layer regions, the repeated spatial frequency can be increased, It can be made difficult to see.

  The unit wiring patterns 2u, 2Fu, 3u, and 3Fu are equivalent patterns, and among the two pairs of vertices that are diagonally related to the unit wiring pattern area, the vicinity of the vertices of one set is a start point and an end point. Wiring and diagonal wiring with the vicinity of the vertex of the other set as a start point and an end point are provided. Thus, the column-direction bundle wiring 6 and the row-direction bundle wiring 7 can be easily configured while connecting the detection column wirings 2 and the detection row wirings 3 of the unit wiring patterns adjacent in the oblique direction at the apexes thereof.

  Further, according to the present embodiment, so-called touch coordinates are detected based on a change in electric field (mutual capacitance change) between the column-direction bundle wiring 6 and the row-direction bundle wiring 7 according to the touch of the indicator. Even in the configuration using the mutual capacitance detection method or the like, the inter-wiring capacitance (electric field coupling) can be reduced as described above. Therefore, a highly sensitive touch screen 1 can be realized.

  In addition, according to the present embodiment, a capacitance measuring circuit is used in which a voltage obtained by dividing a driving voltage by a mutual capacitance (capacitance between matrix wirings at intersections) and a known reference capacitance is applied to the input of the differential amplifier. Even in this configuration, the inter-matrix wiring capacitance with respect to the reference capacitance can be reduced in the same manner as described above. Therefore, since the voltage divided by capacitance can be suppressed, detection can be performed by effectively using the dynamic range of the circuit. In addition, since the reference capacitance corresponding to the inter-wire capacitance between the column-direction bundle wiring 6 and the row-direction bundle wiring 7 can be suppressed, the wiring resistance of the detection column wiring 2 and the detection row wiring 3 and the inter-matrix capacitance In addition, the combined capacity with the reference capacity can be suppressed. Therefore, the settling time of the detection output voltage accompanying charging / discharging can be shortened, that is, the detection time can be shortened, and the response of the touch panel 100 can be improved.

  In addition, even if the number of block areas in which the detection column wiring 2 is provided and the number of block areas in which the detection row wiring 3 is provided in the grid B is not two, a considerable effect can be obtained. Is possible, and is not limited to that number.

  In the embodiment, the inclination angles of the first and second inclined portions of the detection column wiring 2 with respect to the column direction (y direction) are 45 ° and −45 °, respectively, and detection with respect to the row direction (x direction) is performed. The inclination angles of the third and fourth inclined portions of the row wiring 3 are configured to be 45 ° and −45 °, respectively, but are not particularly limited to these angles. For example, the inclination angles of the first and second inclined portions of the detection column wiring 2 with respect to the column direction (y direction) are set to predetermined angles θ and −θ (0 <θ <90 °), and with respect to the row direction (x direction). It is possible to similarly carry out by setting the inclination angles of the third and fourth inclined portions of the detection row wiring 3 to predetermined angles (90 ° −θ) and − (90 ° −θ). In other words, the inclination angles of the first and second inclined portions of the detection column wiring 2 with respect to the column direction (y direction) are set to the predetermined angles θ and −θ (0 <θ <90 °), and the detection row wiring 3 The three inclined portions may be configured to be parallel to the first inclined portion of the detection column wiring 2 and the fourth inclined portion to be parallel to the second inclined portion.

Embodiment 2. FIG.
In the first embodiment, the unit wiring pattern included in each block region has a shape composed of the diagonal wiring and the branch wiring as described with reference to FIGS. A case where a unit wiring pattern having a shape is used will be described.

  FIG. 20 is a unit wiring pattern of the touch screen according to the present embodiment. Here, the detection column wiring 2, the detection row wiring 3, and the floating wirings 2F and 3F are illustrated as equivalent shapes. The diagonal wirings ja and ka are connected at the connection point Ja, and the branch wirings connected to the diagonal wirings ja and ka are omitted.

  The touch screen of the present embodiment is configured using such unit wiring patterns. That is, the touch screen of the present embodiment includes the basic wiring patterns 2u, 3u, 2Fu, and 3Fu of the detection column wiring 2, the detection row wiring 3, and the floating wirings 2F and 3F in the touch screen of the first embodiment. Each is replaced with the basic wiring pattern shown in FIG. Here, the basic wiring patterns replaced in this way are denoted as 2ua, 3ua, 2Fua, and 3Fua, although not shown.

  Similarly to the touch screen in the first embodiment, the unit wiring pattern 2ua of the basic pattern shape detection column wiring 2 shown in FIG. 20 is a unit of another detection column wiring 2 at the end of the diagonal wiring ja or ka. It is connected to the wiring pattern 2ua. In this way, in the block areas C1 and C2, the unit wiring patterns 2ua composed of the detection column wirings 2 are connected in the diagonal direction of the block areas C1 and C2, respectively.

  Then, a part of the diagonal wirings ja and ka of the connected unit wiring pattern 2ua extends in the diagonal direction of the block areas C1 and C2, and the diagonal ± 45 of the detection column wiring 2 connected at the connection point in the center of the block area. Main wiring extending in the direction of °.

  Similarly, the unit wiring pattern 3ua of the detection row wiring 3 having the basic pattern shape shown in FIG. 20 is connected to the unit wiring pattern 3ua of the other detection row wiring 3 at the end of the diagonal wiring ja or ka. In this way, in the block regions R1 and R2, the unit wiring patterns 3ua composed of the detection row wirings 3 are connected in the diagonal direction of the block regions R1 and R2, respectively.

  Then, a part of the diagonal wirings ja and ka of the connected unit wiring pattern 3ua extends in the diagonal direction of the block areas R1 and R2, and the diagonal ± 45 of the detection row wiring 3 connected at the connection point in the center of the block area. Main wiring extending in the direction of °.

  On the other hand, the unit wiring patterns 2Fua and 3Fua of the floating wirings 2F and 3F have structures equivalent to the unit wiring pattern 2ua of the detection column wiring 2 and the unit wiring pattern 3ua of the detection row wiring 3, respectively. It is in an electrically floating state without being connected to any other unit wiring pattern at the end of ka.

  As in the first embodiment, the unit wiring pattern 2ua constituting the detection column wiring 2 connected in the diagonal direction of the block regions C1 and C2 and the detection connected in the diagonal direction of the block regions R1 and R2 In the region between the unit wiring patterns 3 ua constituting the row wiring 3, the unit wiring pattern 2 Fua constituting the floating wiring 2 F that is the same layer wiring as the detection column wiring 2, and the same layer wiring as the detection row wiring 3 Unit wiring patterns 3Fua composed of floating wirings 3F are alternately arranged.

  As described above, in the block regions C1 and C2, the detection column wiring 2 and the unit wiring patterns 2ua and 2Fua of the same layer wiring and the unit wiring pattern 3Fua made of the floating wiring which is a layer wiring different from them are respectively provided. Alternatingly (complementarily), unit wiring patterns of the same layer wiring are arranged in a checker pattern.

  Similarly, in the block regions R1 and R2, the unit wiring pattern 2Fua composed of the detection row wiring 3 and the unit wiring patterns 3ua and 3Fua of the same layer wiring and the floating wiring which is a layer wiring different from them is respectively provided. Alternatingly (complementarily), unit wiring patterns of the same layer wiring are arranged in a checker pattern.

In the touch screen configured with such a unit wiring pattern, similarly to the first embodiment, the block areas C1 and C2 (first block areas) including the detection column wiring 2 and the detection row wiring 3 are arranged. The block areas R1 and R2 (second block areas) included are alternately arranged in the column direction y and the row direction x, and the block areas C1 and C2 (first block areas) and the block areas R1 and R2 (first , Floating wirings 2F and 3F that are not connected to the detection column wiring 2 and the detection row wiring 3 are arranged. As a result, the distance between the detection column wiring 2 and the detection row wiring 3 in the adjacent block region is increased, and the electric field coupling between the detection column wiring 2 and the detection row wiring 3 is reduced. It is possible to reduce the inter-wiring capacity between the column-direction bundle wiring 6 and the row-direction bundle wiring 7 constituted by the wiring. As a result, it is possible to obtain a touch screen with improved responsiveness by improving detection sensitivity and shortening detection time.

  Further, if the unit wiring pattern area has the same size (arrangement pitch), the touch capacitance is slightly reduced because there is no branch wiring, but the transmittance of display light from the display device used in combination is improved. . In addition, since there is no angle component other than ± 45 ° due to the connecting portion of the branch wiring, moire due to interference with the pixel grid of the display device is slightly less likely to occur (the margin of the optimum repetition pitch of the unit wiring pattern with respect to moire occurrence is small). Expanding).

Embodiment 3 FIG.
FIG. 21 shows a unit wiring pattern of the touch screen according to the third embodiment. Here, the detection column wiring 2, the detection row wiring 3, and the floating wirings 2F and 3F are illustrated as equivalent shapes. 21A shows a case where the linear wiring of the unit wiring pattern in the first embodiment is formed in an arc shape, and FIG. 21B shows a case where the linear wiring of the unit wiring pattern in the second embodiment is formed in an arc shape. It corresponds to.

  The unit wiring pattern shown in FIG. 21 (a) has S as a starting point and an ending point in the vicinity of one pair of vertices of two sets of vertices in a square unit wiring pattern region (indicated by a one-dot chain line in the figure). The character-shaped wiring jb and the S-shaped wiring kb having the vicinity of the vertex of the other set as the starting point and the ending point are connected (connected) at the connecting portion Jb at the intersection. In addition, the S-shaped wirings jb and kb are connected by a circular branch wiring eb centering on the intersection Jb of the S-shaped wiring. In the drawing, the radius of the arc constituting the S-shaped wiring is indicated as r, and the radius of the circular wiring is indicated as R.

  Further, the unit wiring pattern shown in FIG. 6B is a form in which the branch wiring eb is omitted from the configuration shown in FIG.

  The touch screen of the present embodiment is configured using such unit wiring patterns. That is, as in the second embodiment, the basic wiring patterns of the detection column wiring 2, the detection row wiring 3, and the floating wirings 2F and 3F in the touch screen of the first embodiment are also applied to the touch screen of the present embodiment. 2u, 3u, 2Fu, and 3Fu are respectively replaced with basic wiring patterns shown in FIG. 21 (a) and FIG. 21 (b).

  The basic wiring pattern on the touch screen according to the first embodiment will be described, for example, when the basic wiring pattern is replaced with the wiring pattern shown in FIG. Here, although not shown, the basic wiring patterns replaced with the wiring patterns shown in FIG. 21A are denoted as 2ub, 3ub, 2Fub, and 3Fub, respectively.

  The unit wiring pattern 2ub of the detection column wiring 2 is connected to the unit wiring pattern 2ub of another detection column wiring 2 at the end of the S-shaped wiring jb or kb. In this way, in the block areas C1 and C2, the unit wiring patterns 2ub composed of the detection column wirings 2 are connected in the diagonal direction of the block areas C1 and C2, respectively.

  Then, a part of the S-shaped wirings jb and kb of the connected unit wiring pattern 2ub extends diagonally with respect to the block areas C1 and C2, and the diagonal line of the detection column wiring 2 connected at the connecting point in the center of the block area. This is the main wiring extending in the ± 45 ° direction.

  Similarly, the unit wiring pattern 3ub of the detection row wiring 3 having the basic pattern shape shown in FIG. 21A is a unit wiring pattern of another detection row wiring 3 at the end of the S-shaped wiring jb or kb. Connected with 3ub. In this way, in the block regions R1 and R2, the unit wiring patterns 3ub composed of the detection row wirings 3 are connected in the diagonal direction of the block regions R1 and R2, respectively.

Then, a part of the S-shaped wirings jb and kb of the connected unit wiring pattern 3ub extends in the diagonal direction of the block regions R1 and R2, and the diagonal lines of the detection row wiring 3 connected at the connection point in the center of the block region. This is the main wiring extending in the ± 45 ° direction.

  Here, the main wiring of the detection column wiring 2 and the detection row wiring 3 to which the S-shaped wirings Jb and kb are connected is a wavy wiring extending in a direction of ± 45 ° obliquely while repeating arc-shaped irregularities. It becomes.

  On the other hand, the unit wiring patterns 2Fub and 3Fub of the floating wirings 2F and 3F have an equivalent structure to the unit wiring pattern 2ub of the detection column wiring 2 and the unit wiring pattern 3ub of the detection row wiring 3, respectively. It is in an electrically floating state without being connected to any other unit wiring pattern at the end of jb or kb.

  As in the first embodiment, the unit wiring pattern 2ub constituting the detection column wiring 2 connected in the diagonal direction of the block regions C1 and C2, and the detection connected in the diagonal direction of the block regions R1 and R2. In the region between the unit wiring patterns 3 ub constituting the row wiring 3, the unit wiring pattern 2 Fub constituting the floating wiring 2 F which is the same layer wiring as the detection column wiring 2, and the same layer wiring as the detection row wiring 3 Unit wiring patterns 3Fub composed of floating wirings 3F are alternately arranged.

  As described above, in the block regions C1 and C2, the detection column wiring 2 and the unit wiring patterns 2ub and 2Fub of the same layer wiring and the unit wiring pattern 3Fub made of floating wirings which are different layer wirings are respectively provided. Alternatingly (complementarily), unit wiring patterns of the same layer wiring are arranged in a checker pattern.

  Similarly, in the block regions R1 and R2, the unit wiring pattern 2Fub including the detection row wiring 3 and the unit wiring patterns 3ub and 3Fub of the same layer wiring and the floating wiring which is a layer wiring different from them are respectively provided. Alternatingly (complementarily), unit wiring patterns of the same layer wiring are arranged in a checker pattern.

  In the touch screen configured with such a unit wiring pattern, similarly to the first embodiment, the block areas C1 and C2 (first block areas) including the detection column wiring 2 and the detection row wiring 3 are arranged. The block areas R1 and R2 (second block areas) included are alternately arranged in the column direction y and the row direction x, and the block areas C1 and C2 (first block areas) and the block areas R1 and R2 (first , Floating wirings 2F and 3F that are not connected to the detection column wiring 2 and the detection row wiring 3 are arranged. As a result, the distance between the detection column wiring 2 and the detection row wiring 3 in the adjacent block region is increased, and the electric field coupling between the detection column wiring 2 and the detection row wiring 3 is reduced. It is possible to reduce the inter-wiring capacity between the column-direction bundle wiring 6 and the row-direction bundle wiring 7 constituted by the wiring. As a result, it is possible to obtain a touch screen with improved responsiveness by improving detection sensitivity and shortening detection time.

  Further, for example, when strong light is irradiated from a spot light source such as direct sunlight, when the unit wiring pattern including the linear wiring as shown in the first and second embodiments is used, the light from the linear wiring is used. Since the directions of reflection are aligned in the ± 45 ° direction, bright lines due to reflected light may be visually recognized in the ± 45 ° direction.

  When the linear wiring has an arc shape as in the unit wiring pattern of this embodiment, it can be dispersed so that the light reflection direction is uniform, and when intense light from a spot light source is irradiated The bright line is very difficult to see.

  In the first to third embodiments, the blocks C1, C2, R1, and R2 and the unit wiring pattern area are described as having a square shape. However, the shape is not limited to this shape, and may be a rectangular shape. It can be implemented similarly.

  1 touch screen, 2 detection column wiring, 2F floating wiring, 2u, 2Fu unit wiring pattern, 2e, 2Fe branch wiring, 3 detection row wiring, 3F floating wiring, 3u, 3Fu unit wiring pattern, 3e, 3Fe branch wiring, 2j, 2k, 2Fj, 2Fk diagonal wiring, 3j, 3k, 3Fj, 3Fk diagonal wiring, 6 column direction bundle wiring, 7 row direction bundle wiring, 12 base substrate, 19 switch circuit, 20 detection processing circuit, 100 touch panel, A grid C1, C2, R1, R2 Block area, ja, ka diagonal wiring, jb, kb S-shaped wiring, eb branch wiring.

Claims (8)

A plurality of column-direction bundle wires, each of which is a set of a plurality of detection column wires electrically connected in common with the column direction as a longitudinal direction;
A plurality of row-direction bundle wirings that are a set of a plurality of detection row wirings electrically connected in common with the row direction as the longitudinal direction;
A touch screen provided between the detection column wiring and the detection row wiring in a plan view and including the detection column wiring and the floating wiring electrically disconnected from the detection row wiring. ,
The detection column wiring has a first inclined part inclined obliquely at a predetermined inclination angle θ (0 <θ <90 °) with respect to the column direction, and the column direction connected to the first inclined part. A zigzag pattern configured by repeatedly arranging the second inclined portion inclined obliquely at an inclination angle of -θ along the row direction,
The detection row wiring includes a third inclined portion inclined obliquely at a predetermined inclination angle of 90 ° -θ with respect to the row direction, and an inclination angle with respect to the row direction connected to the third inclined portion− ( 90 ° -θ) is a zigzag pattern configured by repeatedly arranging a fourth inclined portion inclined obliquely along the row direction,
In plan view,
A first unit wiring pattern provided with the detection column wiring is arranged in the tilt angle θ or −θ direction with respect to the column direction and connected adjacent to each other;
A third unit wiring pattern including a floating wiring formed in the same wiring layer as the detection column wiring, and a fourth unit wiring pattern including a floating wiring formed in the same wiring layer as the detection row wiring. A first block region disposed around a connection point between the first inclined portion and the second inclined portion;
A second unit wiring pattern provided with the detection row wiring is arranged in the inclination angle of 90 ° -θ or-(90 ° -θ) with respect to the row direction and connected adjacent to each other;
A third unit wiring pattern including a floating wiring formed in the same wiring layer as the detection column wiring, and a fourth unit wiring pattern including a floating wiring formed in the same wiring layer as the detection row wiring. A touch screen, wherein second block regions arranged around connection points between the first inclined portion and the second inclined portion are alternately arranged in a column direction and a row direction. The first and third unit wiring patterns and the fourth unit wiring pattern in the first block region are formed by wirings included in unit wiring patterns that are complementarily adjacent in an oblique direction as wirings in the same wiring layer. So as to be alternately arranged in the column direction and the row direction,
The second and fourth unit wiring patterns and the third unit wiring pattern in the second block region are formed by wirings included in unit wiring patterns that are complementary and adjacent in the oblique direction as wirings in the same wiring layer. The touch screen according to claim 1, wherein the touch screen is alternately arranged in the column direction and the row direction. Each of the first block area and the second block area includes a plurality of rectangular unit wiring pattern areas,
The first to fourth unit wiring patterns are:
Among the two pairs of vertices in the unit wiring pattern region diagonally, the first wiring in which the vicinity of the vertex of one set is a start point and an end point;
The touch screen according to claim 1, further comprising a second wiring having a start point and an end point in the vicinity of the vertex of the other set. The first to fourth unit wiring patterns are:
The touch screen according to claim 3, further comprising a branch wiring that connects the first wiring and the second wiring.   The touch screen according to claim 3, wherein the first wiring and the second wiring are linear.   The touch screen according to claim 3 or 4, wherein the first wiring and the second wiring have an arc shape. A touch screen according to any one of claims 1 to 6;
A switch circuit for sequentially selecting each of the plurality of column-direction bundle wires and each of the plurality of row-direction bundle wires;
Capacitance formed between the column-direction bundle wiring selected by the switch circuit and the indicator touching the touch screen, and the row-direction bundle wiring selected by the switch circuit and the indicator And a detection processing circuit that performs a calculation process of touch coordinates on the touch screen indicating the touch position of the indicator based on a detection result of capacitance formed between the touch panel and the touch panel. A touch screen according to any one of claims 1 to 6;
A switch circuit for sequentially selecting each of the plurality of column-direction bundle wires and each of the plurality of row-direction bundle wires;
Based on a detection result of a change in mutual capacitance between the column direction bundle wiring and the row direction bundle wiring selected by the switch circuit in response to the touch of the indicator on the touch screen, A touch panel comprising: a detection processing circuit that performs a process of calculating touch coordinates on the touch screen that indicates a touch position.

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