JP2015176200A - capacitive touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a capacitive touch panel including: a crosswise transparent wiring group consisting of a plurality of transparent conductive wires arranged in parallel in a crosswise direction; and a lengthwise transparent wiring group consisting of a plurality of transparent conductive wires arranged in parallel in a lengthwise direction, formed in matrix on a glass substrate, the capacitive touch panel with its joint to a panel being invisible, easy to process and without deterioration in sensitivity.SOLUTION: A capacitive touch panel includes a plurality of crosswise transparent wiring groups and lengthwise transparent wiring groups formed thereon. When seen from above, only one pair of a crosswise transparent wiring group and a lengthwise transparent wiring group, by each group overlaps to form a matrix state.

Description

  The present invention relates to a capacitive touch panel.

  A touch panel can operate a device by touching a pattern such as a figure or a character displayed on a screen with a finger or a pen. In recent years, a touch panel has been used in a display device mainly including a mobile device. Furthermore, with the increase in the size of display devices, large touch panels have been developed.

  8A and 8B are explanatory views showing an example of a conventional capacitive touch panel, where FIG. 8A is an explanatory view seen from above, and FIG. 8B is a cross-sectional view of the AA ′ portion of FIG. It is explanatory drawing.

  The capacitive touch panel 100 has a configuration in which a plurality of transparent conductive lines arranged in parallel in the horizontal direction and a plurality of transparent conductive lines arranged in parallel in the vertical direction are provided on a glass substrate in a matrix shape. Yes. Each conductive line serves as an electrode that receives a change in capacitance between the transparent conductors or an electric field when touched. In FIG. 8, the horizontal transparent conductive lines are drive lines, and the vertical transparent conductive lines are sensing lines. FIG. 9 is an explanatory view of the drive board (D board) and the sensing board (S board) as viewed from above. A drive substrate provided with a drive line electrode on the glass substrate (FIG. 9B), a sensing substrate provided with a sensing line on the glass substrate (FIG. 9A), and the drive line electrode and the glass substrate of the sensing substrate. Between them, the optical adhesive sheet OCA (Optically Clear Adhesive) is laminated. The surface of the sensing substrate is covered with a windshield (indicated as a surface glass plate in the figure) via the OCA. The windshield serves to form and protect the surface of the capacitive touch panel 100. The back surface of the windshield is provided with a black frame around the periphery of the display portion. Each electrode is grouped as a sensing electrode and a drive electrode in a black frame portion, and is electrically connected to the display device.

  In such a configuration, when touching with a finger on the windshield, for example, a change in capacitance or a change in electric field due to the contact is output to the sensing electrode and the drive electrode. You can know the coordinate value. From this, the operation content is specified by the display device. That is, reading of a signal from the touch panel gives a pulse waveform from the drive line and senses it with the sensing line. Each line is scanned to give a signal, sensed, and read the changed site. In general, the detected signal is processed and detected.

JP 2013-045150 A

  Although the display device can be operated in this way from the touch panel, the following problems arise when the touch panel is enlarged widely in response to the recent increase in size of the display device.

The sensing line and the drive line are formed of a transparent conductive line, but with an increase in size, the resistance value increases because the sheet resistance increases. As a result, voltage fluctuations caused by changes in capacitance and electric field generated by touching are absorbed by the resistance and reduced, making them unreadable. Therefore, when increasing the size, voltage fluctuations due to capacitance changes can be sufficiently achieved by using a wire grid type touch panel sensor that has been patterned using a photolithographic method and a thin metal film such as copper or silver with low sheet resistance. It can be detected and a touch panel with high accuracy can be made. However, in this case, there is a problem that equipment such as a large-area photomask and a large exposure machine is required, resulting in high costs. There is also a method of simply arranging two touch panels, but there is also a problem that the joint between the glass substrate and the glass substrate can be seen.

  As such a countermeasure, for example, a display device in which a plurality of panels are arranged so that a part of the panels overlap each other is disclosed (Patent Document 1). In this display device, each panel includes a display panel and a touch panel arranged on the display panel. And the adjacent panel is arrange | positioned so that the display area of the display panel of the panel located in the observation side and the wiring area of the touch panel of the panel located in the opposite side to the observation side may be bulky. By doing in this way, since each touch panel is isolate | separated by the overlapping part, resistance value does not increase compared with the past. In addition, it is a large panel where the joints between adjacent panels are not noticeable.

  However, such overlapping of the panels in the wiring area requires equipment for alignment, which is costly and increases the number of steps. Furthermore, since the panel in which both the display panel and the touch panel are formed is overlapped, it is bulky.

  In view of the above problems, an object of the present invention is to provide a capacitive touch panel that is simple in process, does not cost expensive, has no visible joints with the panel, and has no reduction in sensitivity.

The present invention has been made in view of the problems, and the invention of claim 1
A horizontal transparent wiring group consisting of a plurality of transparent conductive lines arranged in parallel in the horizontal direction and a vertical transparent wiring group consisting of a plurality of transparent conductive lines arranged in parallel in the vertical direction in a glass substrate in a matrix Capacitance touch panel provided in
Multiple horizontal transparent wiring groups and vertical transparent wiring groups are formed, and when viewed from above, only one set of horizontal transparent wiring group and vertical transparent wiring group overlap each other to form a matrix. This is a capacitive touch panel characterized in that the

The invention of claim 2 of the present invention
A plurality of horizontal transparent wiring boards in which a horizontal transparent wiring group is formed on a substrate and a plurality of vertical transparent wiring boards in which a vertical transparent wiring group is formed on the board, The capacitive touch panel according to claim 1, wherein a directional transparent wiring group is formed.

The invention of claim 3 of the present invention
A horizontal transparent wiring board having a plurality of horizontal transparent wiring groups formed on the substrate and a vertical transparent wiring board having a plurality of vertical transparent wiring groups formed on the board, The capacitive touch panel according to claim 1, wherein a directional transparent wiring group is formed.

The invention of claim 4 of the present invention
The touch panel according to any one of claims 1 to 3, wherein a side closer to the touch side of the horizontal transparent wiring group and the vertical wiring group is a sensing line, and the other is a drive line. It is.

The invention of claim 5 of the present invention
The touch panel according to any one of claims 1 to 4, wherein the number of the matrix is any one of 2 to 4.

  Since the capacitive touch panel of the present invention is configured as described above, the capacitive touch panel has a simple process, does not cost high cost, cannot see the joints with the panel, is not bulky, and has no decrease in sensitivity. can do.

  In addition, when the touch panel is touched with a finger, the finger is grounded. Therefore, the side closer to the touch side of the horizontal transparent wiring group and the vertical wiring group is the sensing line, and the other is the drive line. The detected part can be detected reliably.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which showed 1st Embodiment of the capacitive touch panel of this invention, (a) is explanatory drawing seen from the top, (b) looks at the part of AA 'of FIG. FIG. It is a partial explanatory view showing the configuration of the substrate of the first embodiment example of the capacitive touch panel of this example. It is another partial explanatory drawing which shows the structure of the board | substrate of 1st Embodiment of the capacitive touch panel of this example. It is explanatory drawing which showed 2nd Embodiment of the touchscreen of this invention, (a) is explanatory drawing seen from the top, (b) is explanatory drawing which looked at the part of AA 'of Fig.4 (a) in the cross section. is there. It is explanatory drawing which showed the structure of the board | substrate of 2nd Example of the touchscreen of this invention. It is explanatory drawing which showed 3rd Embodiment of the touchscreen of this invention. It is explanatory drawing which showed the structure of the board | substrate of 3rd Embodiment of the touchscreen of this invention, (a) is explanatory drawing seen from the top, (b) is a cross section of the AA 'part of Fig.7 (a). It is explanatory drawing which saw. It is explanatory drawing which showed an example of the conventional electrostatic capacitance type touch panel, (a) is explanatory drawing seen from upper direction, (b) is explanatory drawing which looked at AA 'part of Fig. (A) in the cross section. . It is explanatory drawing which looked at the drive board | substrate and sensing board | substrate of the conventional electrostatic capacitance touch panel on the upper surface.

  Hereinafter, modes for carrying out the present invention will be described. 1A and 1B are explanatory views showing a first embodiment of the capacitive touch panel of the present invention, where FIG. 1A is an explanatory view seen from above, and FIG. 1B is a portion of AA ′ in FIG. It is explanatory drawing which looked at the cross section. In the present embodiment, the horizontal transparent wiring group is exemplified as a drive line, and the vertical transparent wiring group is exemplified as a sensing line. Since the transparent wiring group forms an electrode of electrostatic capacity, “electrode” is used as a symbol in the figure. That is, the D electrode L and the D electrode R of the drive line indicate the left (L) electrode and the right (R) electrode of the drive line, respectively. The same applies to the sensing line.

  In this embodiment, a drive line made of a plurality of transparent conductive lines arranged in parallel in the horizontal direction and a sensing line made of two transparent conductive lines arranged in parallel in the vertical direction are arranged in a matrix. It is assumed that it is a capacitive touch panel provided on the substrate. A plurality of drive lines and sensing lines are formed, and when viewed from above, only one set of drive lines and sensing lines overlap each other to form two matrix shapes. In the present embodiment example, the matrix shape is a combination of only one set of the left drive line D electrode L and the left sensing line S electrode L, respectively, and one set of the right drive line D electrode R and the right sensing line S electrode R. This is an example in which only two combinations are formed.

  2 and 3 are explanatory diagrams showing the configuration of the substrate of the capacitive touch panel 10 of this example. In this embodiment, as shown in FIG. 1B, FIG. 2, and FIG. 3, two drive line substrates (D substrates L and D) in which drive lines (D electrode L and D electrode R) are formed on the substrate. A substrate R (FIGS. 3C and 3D) and two sensing line substrates (S substrate L and S substrate R (FIG. 2A) having sensing lines (S electrode L and S electrode R) formed on the substrate) 3 (b)), a capacitive touch panel in which two drive lines (D electrode L, D electrode R) and sensing lines (S electrode L, S electrode R) are formed. By laminating a single substrate, when viewed from above, only one set of drive lines and sensing lines overlap each other to form a matrix (FIG. 1). The matrix shape is divided into left drive line D electrode L and left sensor Two combinations of only one set with the Sing line S electrode L and only one set with the right drive line D electrode R and the right sensing line S electrode R. In this example, the optical adhesive sheet OCA is formed. The surface of the uppermost sensing substrate is covered with a windshield (shown as a surface glass plate in the figure) via the OCA. A black frame is provided on the backside of the windshield except for the display area, and the electrodes are gathered together in the black frame area and connected to the display device. Is done.

  In the present embodiment example, since the matrix is separated by the capacitive touch panel having two matrix shapes as described above, the resistance of the transparent electrode line is not increased as compared with the conventional case, and the display area is increased. Can be expanded. Further, since the amount of separation can be controlled by creating a pattern on the substrate by photolithography or the like and aligning the substrate, it can be created so that the connection with the panel is not visible. Furthermore, each matrix may be about the conventional size, and a conventional exposure apparatus can be used for manufacturing. Therefore, high cost is not required. Moreover, since only one set of drive line and sensing line overlap each matrix when viewed from above, it is not bulky. In addition, although the size of the matrix is about the same as the conventional size, it is not particular about this unless a high cost is required.

  4 and 5 show a second embodiment of the capacitive touch panel of the present invention. In this example, the pattern seen from above is the same as the first embodiment, but the layer configuration is different. In this example, a drive line substrate (D substrate (FIGS. 4 and 5B)) in which two drive lines (D electrode L and D electrode R) are formed on the substrate, and two sensing lines (S electrode on the substrate). The sensing line substrate (S substrate (FIGS. 4 and 5A)) on which the L and S electrodes R) are formed, and two drive lines (D electrode L and D electrode R) and sensing lines (S electrode L, The capacitive touch panel 11 is formed with an S electrode R).

  By laminating these two substrates, when viewed from above, only one set of drive lines and sensing lines overlap each other to form a matrix (FIG. 4). That is, two combinations are formed, one combination of the left drive line D electrode L and the left sensing line S electrode L, and one combination of the right drive line D electrode R and the right sensing line S electrode R. This is an example.

  In this example, similarly to the first embodiment, the optical adhesive sheets OCA are used for lamination. Further, the surface of the uppermost sensing substrate is covered with a windshield through the OCA. The windshield serves to form and protect the surface of the touch panel. The back surface of the windshield is provided with a black frame around the periphery of the display portion. Each electrode is collected by a black frame portion and connected to a display device.

  In the first embodiment, four electrode patterns (D electrode L, D electrode R, S electrode L, S electrode R) are formed on different substrates and stacked. On the other hand, in the second embodiment, among the four electrode patterns (D electrode L, D electrode R, S electrode L, S electrode R), the drive line and the sensing line are the same substrate, respectively. Are formed and laminated. For this reason, in addition to the advantages of the first embodiment, in the second embodiment, two patterns are formed on one substrate, so that the accuracy of the gap between the patterns can be easily and highly enhanced. Furthermore, the thickness is not bulky, and sensing is easier.

  FIG. 6 shows a third embodiment of the capacitive touch panel of the present invention. The capacitive touch panel 12 of the present example has a doubled number of matrices of 4 compared to the second embodiment. The capacitive touch panel 12 of this example has a configuration in which a matrix formed on the left and right is also formed in the vertical direction. Each of the matrixes includes only one combination of drive line and sensing line. A gap is provided between the upper and lower patterns for electrical insulation. The electrode lines are also bundled outside the display area. The layer structure is the same as in the second embodiment. In this way, the display area can be further expanded without increasing the resistance of the transparent electrode line. Note that the capacitive touch panel of the third embodiment may have the layer configuration of the first embodiment.

10, 11, 12, 100: Capacitance touch panel D electrode L: Left drive line D electrode R ... Right drive line S electrode L ... Left sensing line S electrode R ... Right sensing line D board ... Drive line board D board L ... Left side drive line board D board R ... Right side drive line board S board ... Sensing line board S board L ... Left side sensing line board S board R ..Right-side sensing line board

Claims (5)

A horizontal transparent wiring group consisting of a plurality of transparent conductive lines arranged in parallel in the horizontal direction and a vertical transparent wiring group consisting of a plurality of transparent conductive lines arranged in parallel in the vertical direction in a glass substrate in a matrix Capacitance touch panel provided in
Multiple horizontal transparent wiring groups and vertical transparent wiring groups are formed, and when viewed from above, only one set of horizontal transparent wiring group and vertical transparent wiring group overlap each other to form a matrix. Capacitive touch panel, characterized by   A plurality of horizontal transparent wiring boards in which a horizontal transparent wiring group is formed on a substrate and a plurality of vertical transparent wiring boards in which a vertical transparent wiring group is formed on the board, The capacitive touch panel according to claim 1, wherein a directional transparent wiring group is formed.   A horizontal transparent wiring board having a plurality of horizontal transparent wiring groups formed on the substrate and a vertical transparent wiring board having a plurality of vertical transparent wiring groups formed on the board, The capacitive touch panel according to claim 1, wherein a directional transparent wiring group is formed.   The touch panel according to any one of claims 1 to 3, wherein one of the horizontal transparent wiring group and the vertical wiring group that is closer to the touch side is a sensing line, and the other is a drive line.   The touch panel according to any one of claims 1 to 4, wherein the number of the matrix is any one of 2 to 4.