JP2015148985A - information display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration in a communication characteristic in non-contact communication while preventing reduction in the amount of information that can be displayed and preventing the whole device from becoming large.SOLUTION: A background electrode 13 is formed such that it will surround display electrodes 11a-11n in a loop on a base substrate 14 on which the display electrodes 11a-11n are formed, and a loop-shaped non-contact communication antenna 15 is provided such that it will face the background electrode 13. The background electrode 13 is provided with a gap 17 at its one place and the loop is broken.

Description

  The present invention relates to an information display device capable of non-contact communication.

  Conventionally, as a display device for displaying information, a CRT display, a liquid crystal display, a plasma display, and the like are used. These are used in a television receiver to display a television image transmitted from a television station or a personal computer. It is possible to display information stored in a personal computer or information distributed via the Internet.

  In recent years, in addition to the display devices described above, thin information display devices that display digital information on a thin display medium such as paper have begun to spread. Such a thin information display device is easy to carry because it is thin like paper, consumes less power, has a wide viewing angle, and rewrites information displayed by the voltage applied to the electrodes. In addition, the display contents can be retained even when the power is turned off.

  4A and 4B are diagrams showing an example of a thin information display device, where FIG. 4A is a front view, FIG. 4B is a cross-sectional view taken along line AA ′ shown in FIG. 4A, and FIG. It is a figure which shows the structure on the last base material 214.

  In this example, as shown in FIG. 4, a transparent conductive film substrate 220 in which a transparent electrode (for example, ITO: Indium Tin Oxide) 221 is formed on one surface of a transparent substrate 222 made of glass, a transparent film, etc., and a base An information display layer 230 is sandwiched between display electrodes 211a to 211n and background electrodes 212a to 212d and 213 formed on the base material 214.

  The display electrodes 211a to 211n are formed on one surface of the base substrate 214 in a pattern corresponding to the displayed information. In this example, the display electrodes 211a to 211n are used to display a two-digit number. A voltage is selectively applied via a wiring (not shown), and "00" to "99". Numbers can be displayed. The background electrodes 212a to 212d and 213 are formed on the base substrate 214 so as to fill a region where the display electrodes 211a to 211n are not formed, and the background electrode 213 includes all of the display electrodes 211a to 211n. It is formed so as to surround the loop.

  An area facing the display electrodes 211 a to 211 n is an information display section 202 for displaying information, and the other area is a background section 203.

  In the information display device 201 configured as described above, a predetermined voltage is applied to the background electrodes 212 a to 212 d and 213 while the transparent electrode 221 is set to the reference potential, and the information display unit 202 displays the information. When two types of voltages are selectively applied to the display electrodes 211a to 211n according to the information to be performed, the potential difference between the transparent electrode 221, the display electrodes 211a to 211n and the background electrodes 212a to 212d, 213 is determined. As a result, the state of the information display layer 230 changes. Of the display electrodes 211a to 211n, a region facing the display electrode to which one of the two voltages is applied and a region facing the display electrode to which the other of the two voltages is applied. The colors of the information display unit 202 are different from each other, and the difference in color is visually recognized from the transparent conductive film substrate 220 side, and information is displayed on the information display unit 202. Note that one of the two kinds of voltages applied to the display electrodes 211a to 211n is applied to the background electrodes 212a to 212d and 213, and therefore, in the region serving as the background portion 203 of the information display layer 230. One of the two colors displayed on the information display unit 2 is displayed. As a result, of the display electrodes 211a to 211n, the area facing the display electrode to which a voltage different from that of the background electrodes 212a to 212d and 213 is applied is displayed in a color different from that of the background portion 203 and information is displayed. become.

  In recent years, it has been considered to add a non-contact communication function to such an information display device. For example, when such an information display device is close to the reader / writer, the display element is driven by electric power generated by electromagnetic induction by the magnetic field from the reader / writer, and information transmitted from the reader / writer or information written in the memory Is configured to be able to display.

  However, since the display electrode and the background electrode are formed on one surface of the base substrate in the information display device as described above, the display electrode and the background electrode are moved by the magnetic field from the reader / writer when approaching the reader / writer. An eddy current is generated on the surface, which makes it difficult for electromagnetic induction due to the magnetic field from the reader / writer to occur, and the communication characteristics deteriorate.

  Therefore, in the information display device capable of displaying information using the segment electrode and capable of non-contact communication, the configuration in which the non-contact communication antenna is arranged side by side on the segment electrode makes it difficult to cause deterioration in communication characteristics. For example, it is disclosed in Patent Document 1.

  However, since the non-contact communication antenna and the segment electrode are arranged side by side in the one disclosed in Patent Document 1, when the size of the entire apparatus is determined, a display that displays information As the area of the area becomes smaller, the amount of information that can be displayed decreases, and if the area of the display area for displaying information is determined, the overall size of the apparatus becomes larger. There is a problem. In particular, when the information display device is in the shape of a card, the amount of information that can be displayed is reduced, and the size of the antenna is also reduced, resulting in a shorter distance for non-contact communication.

  Therefore, the applicant of the present application has come up with a configuration that makes it difficult for eddy currents to occur in the segment electrode by configuring the segment electrode from an assembly of linear patterns, and discloses this in Patent Document 2. In the technique disclosed in Patent Document 2, a non-contact communication antenna for performing non-contact communication is arranged so as to surround at least a part of the segment electrode. The area surrounded by the antenna is not composed mainly of a plane but is composed of a collection of linear patterns, so that eddy currents are unlikely to occur when close to the reader / writer for non-contact communication. Thus, deterioration of communication characteristics is avoided.

Japanese Patent No. 4598477 JP 2012-190129 A

  What is disclosed in Patent Document 2 is that, among the segment electrodes, at least the area surrounded by the antenna for non-contact communication is composed mainly of a linear pattern rather than a planar pattern. Since non-contact communication is less likely to generate eddy currents, the amount of information that can be displayed is reduced or the overall size of the apparatus is increased, as disclosed in Patent Document 1. Can be avoided.

  The applicant of the present application has conducted further research and the amount of information that can be displayed is reduced or the size of the entire device is increased without configuring the segment electrode from a collection of linear patterns. While avoiding this, the present inventors have found an information display device that can avoid deterioration of communication characteristics in non-contact communication.

  An object of the present invention is to provide an information display device capable of avoiding deterioration in communication characteristics in non-contact communication while avoiding a decrease in the amount of information that can be displayed or an increase in the size of the entire device. .

In order to achieve the above object, the present invention provides:
A display electrode group comprising at least one display electrode formed on a base substrate; a common electrode disposed opposite to the base substrate of the display electrode group; and the display electrode group and the common electrode Information display layer sandwiched between the display electrode and the information display layer when the information display layer is viewed from one side according to the potential difference between the display electrode and the common electrode In an information display device for displaying information by changing the display color in
A conductor provided on the base substrate so as to surround the display electrode group in a loop; and
A loop-shaped non-contact communication antenna provided to face the conductor;
A communication circuit that performs non-contact communication via the non-contact communication antenna;
The conductor is characterized in that the loop is interrupted in at least one place.

  In the present invention configured as described above, when a predetermined voltage is applied to the common electrode, a voltage different from the voltage applied to the common electrode is applied to the display electrode. If a potential difference is generated between the information display device and the information display device when viewed from one side, the display color in the information display layer changes, and information is displayed accordingly. Further, a loop-shaped non-contact communication antenna is provided, and non-contact communication is performed via the non-contact communication antenna. Here, on the base substrate on which the display electrodes are formed, a conductor is provided so as to surround the display electrode group constituted by the display electrodes in a loop and to face the non-contact communication antenna. Since the loop is interrupted at at least one location of the conductor, when the proximity of the reader / writer is used for non-contact communication, eddy currents are less likely to occur due to the interrupted portion of the loop, and the communication characteristics are deteriorated. Avoided.

  In this way, since at least one portion of the conductor loop provided on the base substrate is surrounded so as to surround the display electrode group in a loop shape, eddy currents are less likely to occur. Deterioration of communication characteristics can be avoided without arranging the contact communication antenna alongside the display electrode.

  According to the present invention, it is difficult to generate eddy currents by adopting a configuration in which at least one portion of the conductor loop provided on the base substrate is interrupted so as to surround the display electrode group in a loop shape. Without locating the non-contact communication antenna alongside the display electrodes, it is possible to avoid deterioration of communication characteristics, thereby avoiding a decrease in the amount of information that can be displayed and an increase in the size of the entire device. However, it is possible to avoid deterioration of communication characteristics in non-contact communication.

It is a figure which shows one Embodiment of the information display apparatus of this invention, (a) is a surface figure, (b) is AA 'sectional drawing shown to (a), (c) is shown to (b). The figure which shows the structure of the surface of the last base material, (d) is a figure which shows the structure of the back surface of the base material shown in (b). 2A and 2B are diagrams for explaining a display operation in the information display device illustrated in FIG. 1, in which FIG. 1A is a partial cross-sectional view when information is not displayed, and FIG. 2B is a partial cross-section when information is displayed. FIG. 4C is a surface view in a state where information is displayed. It is a figure which shows other embodiment of the information display apparatus of this invention, (a) is a surface view, (b) is AA 'sectional drawing shown to (a), (c) is (b). The figure which shows the structure of the lamination | stacking surface with the information display layer of the shown base base material, (d) is a figure which shows the structure of the exposed surface of the base base material shown to (b). It is a figure which shows an example of a thin information display apparatus, (a) is a surface view, (b) is AA 'sectional drawing shown to (a), (c) is a base base material shown to (b) It is a figure which shows the above structure.

  Embodiments of the present invention will be described below with reference to the drawings.

  1A and 1B are diagrams showing an embodiment of an information display device according to the present invention. FIG. 1A is a front view, FIG. 1B is a cross-sectional view taken along line AA ′ shown in FIG. The figure which shows the structure of the surface of the base base material 14 shown to b), (d) is a figure which shows the structure of the back surface of the base base material 14 shown to (b).

  In this embodiment, as shown in FIG. 1, an information display layer 30 is laminated on the surface of the base substrate 14, and a transparent conductive film substrate 20 is laminated on the opposite side of the information display layer 30 from the base substrate 14. Has been.

  Display electrodes 11 a to 11 n and background electrodes 12 a to 12 d and 13 are formed on the surface of the base substrate 14, and a non-contact communication antenna 15 is formed on the back surface of the base substrate 14. An IC chip 16 including a communication circuit that performs non-contact communication via the antenna 15 is mounted. The display electrodes 11 a to 11 n are formed in a pattern corresponding to information displayed on the information display device 1. In this embodiment, the display electrodes 11a to 11n are used to display a two-digit number. A voltage is selectively applied via a wiring (not shown), so that "00" to "99" Numbers can be displayed. The background electrodes 12a to 12d and 13 are formed on the base substrate 14 so as to fill the regions where the display electrodes 11a to 11n are not formed, and a predetermined voltage is applied via wiring (not shown). The Of the background electrodes 12a to 12d and 13, the background electrode 13 serving as a conductor in the present invention is formed on the base substrate 14 so as to surround the display electrode group including all the display electrodes 11a to 11n in a loop shape. In addition, a gap 17 is formed by interrupting one part of the loop. The non-contact communication antenna 15 has a loop shape, and is formed on the back surface of the base substrate 14 so as to face the background electrode 13.

  The transparent conductive film substrate 20 is configured by forming a transparent electrode (for example, ITO) 21 serving as a common electrode on one surface of a transparent substrate 22 made of glass, a transparent film, or the like. The display electrodes 11a to 11n and the background electrodes 12a to 12d, 13 and the transparent electrode 21 are arranged to face each other, and an information display layer is provided between the display electrodes 11a to 11n and the background electrodes 12a to 12d, 13 and the transparent electrode 21. 30 is sandwiched.

  Below, operation | movement of the information display apparatus 1 comprised as mentioned above is demonstrated.

  First, the display operation in the information display device 1 will be described.

  2A and 2B are diagrams for explaining a display operation in the information display device 1 shown in FIG. 1, in which FIG. 2A is a partial cross-sectional view in a state where no information is displayed, and FIG. (C) is the surface figure in the state where information is displayed.

  In the information display device 1 shown in FIG. 1, as shown in FIG. 2A, the partition wall in which the chargeable particles 33 are dispersed in the area surrounded by the partition wall 31 and the seal layer 34. The inner liquid 32 is accommodated. The base substrate 14, the information display layer 30, and the transparent conductive film substrate 20, the transparent electrode 21, the display electrodes 11 a to 11 n, and the background electrodes 12 a to 12 d, 13 are surrounded by the partition wall 31 and the seal layer 34. They are stacked so as to face each other through the liquid 32 in the partition accommodated in the region. The partition wall 31 includes a bottom portion, a side portion that is an outer peripheral portion of the information display layer 30, and a wall portion that divides the region surrounded by the side portion into a plurality of regions of, for example, 130 μm □. The surface on the opposite side is open. And it laminates | stacks so that the bottom part side may oppose display electrode 11a-11n and background electrode 12a-12d, 13, and the seal layer 34 is laminated | stacked on the opened side.

  In the information display device 1 configured as described above, for example, when displaying a two-digit number “23”, the transparent electrode 21 is set to the GND potential, the display electrodes 11a, 11d, 11h, and 11m and the background electrodes 12a to 12a. Negative voltages are applied to 12d and 13 respectively, and positive voltages are applied to the display electrodes 11b, 11c, 11e to 11g, 11i to 11l, and 11n, respectively.

  Then, since the partition wall liquid 32 accommodated in the region surrounded by the partition wall 31 and the seal layer 34 is made of a dielectric material, and the chargeable particles 33 are charged to a negative potential, FIG. ), The chargeable particles 33 move in the partition wall liquid 32 by Coulomb force, and display electrodes 11a, 11d, 11h, and 11m and background electrodes 12a to 12d and 13 to which a negative voltage is applied are formed. The charged particles 33 are attracted toward the transparent electrode 21 in the region. Similarly, in the region where the display electrodes 11b, 11c, 11e to 11g, 11i to 11l, and 11n to which a positive voltage is applied are formed, the chargeable particles 33 are attracted to the display electrode side.

  When the information display device 1 is viewed from the transparent conductive film substrate 20 side, the liquid in the partition wall 32 is colored with a dye or pigment, and the chargeable particles 33 include a light scattering component having a high refractive index. A region where the charged particles 33 are attracted to the electrodes 11a to 11n side, that is, a region facing the display electrodes 11b, 11c, 11e to 11g, 11i to 11l and 11n to which a positive voltage is applied is colored. The region where the charged particles 33 are attracted to the transparent electrode 21 side, that is, the region facing the display electrodes 11a, 11d, 11h, and 11m and the background electrodes 12a to 12d and 13 to which a negative voltage is applied. It looks white.

  Thus, according to the potential difference between the display electrodes 11a to 11n and the transparent electrode 21, the display color of the information display layer 30 in the information display unit 2 when the information display layer 30 is viewed from one side changes. As a result, as shown in FIG. 2C, the region facing the background electrodes 12a to 12d, 13 becomes the white background portion 3, and in the information display portion 2, it faces the display electrodes 11a, 11d, 11h, 11m. The area to be displayed becomes the white non-display part 2b, and the area facing the display electrodes 11b, 11c, 11e to 11g, 11i to 11l, and 11n becomes the colored display part 2a, and the two-digit number “23” is displayed. It will be.

  Next, a non-contact communication operation in the information display device 1 will be described.

  When the information display device 1 shown in FIG. 1 is brought close to the reader / writer, the magnetic flux from the reader / writer penetrates the inside of the loop-shaped non-contact communication antenna 15, and current is supplied to the non-contact communication antenna 15 by electromagnetic induction. Flowing. At this time, the background electrode 13 is formed on the base substrate 14 so as to surround the display electrode group constituted by the display electrodes 11 a to 11 n in a loop shape and to face the non-contact communication antenna 15. However, since the background electrode 13 is interrupted by a gap 17 formed at one location thereof, when the background electrode 13 is close to the reader / writer for non-contact communication, the loop is interrupted by the interrupted portion. Current is less likely to occur.

  As a result, a current corresponding to the magnetic flux from the reader / writer flows to the non-contact communication antenna 15, and this current is supplied to the IC chip 16 to drive the IC chip 16, and between the reader / writer and the IC chip 16. Thus, non-contact communication of data writing and reading is performed via the non-contact communication antenna 15.

  In this way, by having a configuration in which at least one of the loops of the background electrode 13 formed on the base substrate 14 is interrupted so as to surround the display electrode group constituted by the display electrodes 11a to 11n in a loop shape, Since eddy currents are less likely to occur, deterioration of communication characteristics can be avoided without arranging the non-contact communication antenna 15 side by side with the display electrode display electrodes 11a to 11n.

(Other embodiments)
3A and 3B are diagrams showing another embodiment of the information display device of the present invention, in which FIG. 3A is a front view, FIG. The figure which shows the structure of the lamination | stacking surface with the information display layer 130 of the base base material 114 shown to (b), (d) is a figure which shows the structure of the exposed surface of the base base material 114 shown to (b).

  In this embodiment, as shown in FIG. 3, the base substrate 114 is folded at a folding portion 118 with respect to that shown in FIG. 1, and the background electrode is folded at the folding portion 118. 113 and the non-contact communication antenna 115 are different from each other.

  Also in the information display device 101 of this embodiment, the background electrode 113 formed on the base substrate 114 is configured by the display electrodes 111a to 111n in a state where the base substrate 114 is folded at the folding portion 118. The group is formed so as to surround the group in a loop and so as to face the non-contact communication antenna 115, and the background electrode 113 has a gap 117 formed at one location thereof, and the loop is interrupted. When close to the reader / writer for non-contact communication, an eddy current is less likely to occur due to the portion where the loop is interrupted.

  In the above-described embodiment, in order to display the non-display portion 2b in the information display portions 2 and 102 as a conductor surrounding the display electrode group constituted by the display electrodes 11a to 11n and 111a to 111n in a loop shape. In the above description, the background electrodes 13 and 113 for displaying the background portions 3 and 103 are applied as an example, and the display electrodes 11a to 11n and 111a are used as the conductors in the present invention. As long as the display electrode group constituted by ˜111n is surrounded in a loop shape and provided in a region where information is not displayed, such as the background portions 3 and 103, the voltage may not be applied. The number of gaps is not limited to one, and the conductor may have a structure in which the loop is interrupted at a plurality of locations.

  Further, the non-contact communication antenna 15 is not limited to the one formed on the base substrate 14 or 114, and the transparent conductive film substrate 20 of the information display layers 30 and 130 as long as it faces the loop-shaped conductor. It may be arranged on the 120 side.

DESCRIPTION OF SYMBOLS 1,101 Information display apparatus 2,102 Information display part 2a Display part 2b Non-display part 3,103 Background part 11a-11n, 111a-111n Display electrode 12a-12d, 13,112a-112d, 113 Background electrode 14,114 Base Base material 15, 115 Non-contact communication antenna 16, 116 IC chip 17, 117 Gap 20, 120 Transparent conductive film substrate 21, 121 Transparent electrode 22, 122 Transparent substrate 30, 130 Information display layer 31, 131 Partition 32, 132 Partition Inner liquid 33,133 Chargeable particles 34,134 Seal layer 118 Folding part

Claims (1)

A display electrode group comprising at least one display electrode formed on a base substrate; a common electrode disposed opposite to the base substrate of the display electrode group; and the display electrode group and the common electrode Information display layer sandwiched between the display electrode and the information display layer when the information display layer is viewed from one side according to the potential difference between the display electrode and the common electrode In an information display device for displaying information by changing the display color in
A conductor provided on the base substrate so as to surround the display electrode group in a loop; and
A loop-shaped non-contact communication antenna provided to face the conductor;
A communication circuit that performs non-contact communication via the non-contact communication antenna;
In the information display device, the conductor has a loop cut at least at one place.

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