JP2010008488A - Light emitting display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting display using stress light emitting bodies for displaying a high-contrast image. <P>SOLUTION: The light emitting display 1A includes a wiring board 2, many columnar actuators 3 disposed respectively at equal intervals in a direction (X direction) along a long side of one surface of the wiring board 2 and a direction (Y direction) along a short side orthogonal thereto, the stress light emitting bodies 4 each provided to part of each actuator 3, a protective film 5 covering surfaces of the actuators 3, and a control circuit (control means) 6 and a driver circuit 7 mounted on the wiring board 2. The actuator 3 in use may comprise a shape memory resin, a shape memory alloy, a piezoelectric element (electrostriction element), an ion conductive polymer actuator, a conductive polymer actuator, etc. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light-emitting display device using an actuator and a stress-stimulated luminescent material, and more particularly to a means for increasing the contrast of an image displayed on the light-emitting display device.

  In recent years, stress light emitters that reversibly emit light in an elastic deformation region when subjected to mechanical external force at room temperature have been developed (see, for example, Non-Patent Document 1). In recent years, actuators that are deformed in the air by applying a low voltage of about several volts have been developed (see Non-Patent Document 2, for example). Furthermore, development of a light emitting display device using these stress light emitters and actuators is also underway (see, for example, Patent Document 1).

Patent Document 1 discloses a light-emitting display device in which a plurality of electrostrictive rods (actuators) 101 are arranged on one surface of a stress-stimulated luminescent material 100 formed in a film shape, as shown in FIG. The light emitting display device having such a configuration can apply a mechanical external force to a part of the stress light emitter 100 by applying a voltage to any one of the plurality of electrostrictive rods 101. A desired portion can be selectively made to emit light, and an arbitrary image can be displayed on the film-like stress light emitter 100.
"Stress luminescent materials and their applications", Xu Choo, Kyushu Industrial Research Institute ([Currently, National Institute of Advanced Industrial Science and Technology, Kyushu Center) 1999 Annual Conference Lectures (1999) “Polymer-based actuator”, Atsushi Atsushi, “Future actuator material / device”, CM Publishing, 2006, pp. 232-240 Japanese Patent Publication No. 2003-078889

  Incidentally, it is needless to say that a light emitting display device capable of displaying an arbitrary image of this type is capable of displaying an image with high contrast and easy to visually recognize. However, since the conventional light emitting display device shown in FIG. 10 has a plurality of electrostrictive rods 101 arranged on one side of a stress-stimulated luminescent material 100 formed in a film shape, a voltage is applied to one electrostrictive rod 101. Then, when a mechanical external force is applied to a part of the stress light emitter 100, the mechanical external force is propagated to the periphery of the portion subjected to the mechanical external force due to the elasticity of the stress light emitter 100, and the mechanical external force is transmitted. Not only the received part but also its peripheral part emits light. For this reason, sufficient contrast cannot be obtained in the displayed image.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a light emitting display device using a stress light emitting body capable of emitting and displaying a high contrast image.

  In order to solve the above-described problems, the present invention provides a light-emitting display device that includes a plurality of actuators arranged in a plane direction and a mechanical external force that is provided for each of the actuators and that is driven by driving of the actuators. A stress light emitter that reversibly emits light in an elastic deformation region and a driving unit that individually drives the plurality of actuators.

  According to such a configuration, since the stress light emitter is provided for each actuator, when one actuator is driven, the mechanical external force accompanying the deformation propagates to the stress light emitter provided in the other actuator. Therefore, a high-contrast image can be displayed. In the light emitting display device of this configuration, even when mechanical external force is applied to the actuator from the outside, the mechanical external force is transmitted to the stress light emitter through the actuator, and the stress light emitter emits light. A handwritten image can also be displayed on the display surface.

  Secondly, according to the present invention, in the first light emitting display device, the plurality of actuators are connected to each other via a flexible connecting member.

  According to such a configuration, since the plurality of actuators are coupled to each other via the coupling member, the actuator and the stress illuminant are handled at the time of assembling the light emitting display device as compared with the case where each actuator and the stress illuminant are individually handled. Can be made easy. In addition, since the connecting member is formed of a flexible material, mechanical external force generated by driving one actuator is absorbed by the connecting member and does not reach the periphery. Therefore, the contrast of the light emitting display is not harmed.

  Thirdly, in the first light emitting display device according to the present invention, the periphery of each actuator is covered with a light shielding member.

  According to such a configuration, since the light shielding member is provided around each actuator, when one actuator is driven and the stress light emitter provided in the one actuator emits light, the light emitted in the peripheral direction of the actuator Can be shielded by a light shielding member. Therefore, bleeding of light emission can be prevented or suppressed, and the contrast of light emission display can be further increased.

  Fourthly, according to the present invention, in the first light emitting display device, the plurality of actuators are set on a wiring board, and a surface of the stress light emitting body provided at an end of the actuator is covered with a protective film. It was configured as follows.

  According to such a configuration, since the actuator is set on the wiring board, electrical wiring to the actuator can be facilitated. Moreover, since the surface of the stress light emitter is covered with the protective film, the stress light emitter can be prevented from being worn or soiled, and the durability of the light emitting display device can be improved.

  According to the present invention, a light emitting display device is provided with a plurality of actuators arranged in a plane direction, and is provided for each of the actuators, and reversibly emits light in an elastic deformation region when subjected to a mechanical external force accompanying driving of the actuators. The stress light emitter is provided with a driving means for individually driving the plurality of actuators. Therefore, when one actuator is driven, the mechanical light force generated by the deformation is applied to the other actuators. A high-contrast image can be displayed without propagating to the body.

  Embodiments of a light-emitting display device according to the present invention will be described below with reference to the drawings.

  As shown in FIGS. 1 and 2, the light emitting display device 1 </ b> A according to the first embodiment includes a wiring board 2, a direction along the long side of one side of the wiring board 2 (X direction), and a short side perpendicular thereto. And a plurality of cylindrical actuators 3 arranged at equal intervals in the direction along the direction (Y direction), and a part of each actuator 3 (in the example of FIGS. 1 and 2, the upper end of the actuator 3). The stress light emitter 4, a protective film 5 covering the surface of the actuator 3, a control circuit (control means) 6 and a driver circuit 7 mounted on the wiring board 2 are provided.

  As shown in FIGS. 3A and 3B, the wiring board 2 is provided with mounting holes 21 of the actuator 3 in a predetermined arrangement. Then, on the front surface side, as shown in FIG. 3 (a), an individual wiring 22 for individually connecting one electrode of the actuator 3 set in each mounting hole 21 is provided. As shown in FIG. 3B, a common wiring 23 for connecting the other electrode of the actuator 3 set in each mounting hole 21 in common is applied.

  As the actuator 3, one made of a shape memory resin, a shape memory alloy, a piezoelectric element (electrostrictive element), an ion conductive polymer actuator, a conductive polymer actuator, or the like can be used.

  As shown in FIG. 4, the actuator 3 made of shape memory resin and shape memory alloy can be driven by setting in the mounting hole 21 and connecting the individual wiring 22 and the common wiring 23 at two locations on the surface. .

  As shown in FIG. 5, the upper electrode 31 and the lower electrode 32 are extended from the body portion of the actuator 3 made of a piezoelectric element. With this configuration, when set in the mounting hole 21, the connection between the upper electrode 31 and the individual wiring 22 and the connection between the lower electrode 32 and the common wiring 23 become possible, and the actuator 3 functions. be able to.

  The ion conductive polymer actuator 3 is provided with an upper electrode 31 and a lower electrode 32 on both front and back surfaces of the ion conductive polymer 33, and can be used as they are. As shown in FIG. It can also be used by being enclosed in the resin 34. When the ion conductive polymer actuator 3 is encapsulated in a resin 34 and used, an external upper electrode 35 and a lower electrode electrically connected to the upper electrode 31 are formed on the surface of the resin 34 as shown in FIG. An external lower electrode 36 that is electrically connected to the electrode 32 is formed. With this configuration, when set in the mounting hole 21, the connection between the external upper electrode 35 and the individual wiring 22 and the connection between the external lower electrode 36 and the common wiring 23 become possible. 3 can function.

  The conductive polymer actuator 3 is provided with the upper electrode 31 and the lower electrode 32 on both the front and back surfaces of the conductive polymer 37, and is wound into a cylindrical shape as shown in FIG. The upper electrode 31 and the lower electrode 32 can be exposed at the body portion by folding the electrode to the opposite side. With this configuration, when set in the mounting hole 21, the connection between the upper electrode 31 and the individual wiring 22 and the connection between the lower electrode 32 and the common wiring 23 become possible, and the actuator 3 functions. be able to.

  1 and 4 to 7, the actuator 3 is formed in a cylindrical shape, but the gist of the present invention is not limited to this, but a triangular prism shape, a quadrangular prism shape, a pentagonal prism shape, a hexagonal shape, and the like. It can be formed in an arbitrary shape such as a columnar shape.

  As the stress-stimulated luminescent material 4, a material in which stress-stimulated luminescent powder such as ZnS: Mn powder is dispersed in a high-purity resin matrix can be used. 1 and 2, the stress light emitter 4 is provided at the lower end of the actuator 3, but the gist of the present invention is not limited thereto, and is provided at the upper end of the actuator 3. It is also possible to adopt means such as providing at the upper and lower end portions of the actuator 3, providing at the same portion of the actuator 3 formed in a column shape, or enclosing in the internal space of the actuator 3 formed in a cylindrical shape.

  The protective film 5 protects the stress-stimulated luminescent material 4 from adverse mechanical or chemical effects, and is formed of a flexible transparent plastic.

  The control circuit 6 controls the driving of each actuator 3 through the individual wiring 22 and the common wiring 23 formed on the wiring board 2, and selects only the required actuator 3 from among a large number of actuators 3 through the driver circuit 7. By driving the actuator, the stress light emitter 4 provided on the actuator 3 emits light, and a required image is displayed.

  Since the light emitting display device 1A of this example is provided with the stress light emitter 4 for each actuator 3, when the one actuator 3 is driven, the mechanical light force associated with the deformation is provided on the other actuator. Therefore, a high-contrast image can be displayed. Further, the stress light emitter 4 can also emit light by applying a mechanical external force to the stress light emitter 4 from the outside of the protective film 5, and in this case, a handwritten image can be displayed with high contrast. it can. Furthermore, since the light emitting display device 1A of the present example sets the actuator 3 on the wiring board 2, the electric wiring to the actuator 3 can be facilitated, and the surface of the stress light emitting body 4 provided at the end of the actuator 3 can be formed. Since it covers with the protective film 5, the stress light-emitting body 4 can be prevented from being worn or soiled, and the durability of the light-emitting display device can be enhanced. In addition, the light-emitting display device 1A of the present example includes the control circuit 6 and the driver circuit 7 that control the driving of the actuator 3, so that the light-emitting display can be performed by changing the signal supplied from the control circuit 6 to each actuator 3. An arbitrary image can be displayed on the apparatus at a required timing.

  Next, the light emitting display device 1B according to the second embodiment will be described with reference to FIG. As shown in FIG. 8, the light emitting display device 1 </ b> B of this example is characterized in that the actuators 3 arranged adjacent to each other are connected to each other via a flexible connecting member 8.

  The connecting member 8 is formed of a gelling material such as silicon gel or acrylic gel, or a foamed material such as foamed plastic. Others are the same as those of the light-emitting display device 1A according to the first embodiment, and therefore, the corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  In this way, when the adjacent actuators 3 are connected to each other via the flexible connecting member 8, the individual actuators 3 and the stress light emitters 4 provided on the actuators 3 are individually handled as compared with each other. The handling of the actuator 3 and the stress-stimulated illuminant 4 during transportation or assembly of the light-emitting display device can be facilitated, and the cost of the light-emitting display device can be reduced. Since the connecting member 8 is formed of a flexible material such as a gelling material or a foamed material, the mechanical external force generated by driving one actuator 3 is absorbed by the connecting member 8 and extends to the periphery. Absent. Therefore, the contrast of the light emitting display is not harmed.

  Next, a light-emitting display device 1C according to a third embodiment will be described with reference to FIG. As shown in FIG. 9, the light emitting display device 1 </ b> C of the present example is characterized in that the periphery of each actuator 3 is covered with a light shielding member 9.

  The light shielding member 9 is formed of a gelled material such as silicon gel or acrylic gel colored in black, or a foamed material such as foamed plastic. Others are the same as those of the light-emitting display device 1A according to the first embodiment, and therefore, the corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  As described above, when the light shielding member 9 is provided around each actuator 3, when one actuator 3 is driven and the stress light emitter 4 provided in the one actuator 3 emits light, the peripheral direction of the actuator 3 is determined. Since the light emitted to the light can be shielded by the light shielding member 9, it is possible to prevent or suppress the bleeding of light emission and to further increase the contrast of the light emission display.

1 is an exploded perspective view of a light emitting display device according to a first embodiment. It is principal part sectional drawing of the light emission display apparatus which concerns on 1st Embodiment. It is the principal part top view and back view of a wiring board. It is a block diagram of the actuator which consists of shape memory resin or a shape memory alloy. It is a block diagram of the actuator which consists of a piezoelectric element. It is a block diagram of an ion conductive polymer actuator. It is a block diagram of a conductive polymer actuator. It is principal part sectional drawing of the light emission display apparatus which concerns on 2nd Embodiment. It is principal part sectional drawing of the light emission display apparatus which concerns on 3rd Embodiment. It is a perspective view which shows the light emission display apparatus which concerns on a well-known example.

Explanation of symbols

1A, 1B, 1C Light-emitting display device 2 Wiring board 3 Actuator 4 Stress light emitter 5 Protective film 6 Control circuit (control means)
7 Driver Circuit 21 Mounting Hole 22 Individual Wiring 23 Common Wiring 31 Upper Electrode 32 Lower Electrode

Claims (4)

  A plurality of actuators arranged in a plane direction, a stress illuminator that is provided for each of the actuators and reversibly emits light in an elastic deformation region when subjected to a mechanical external force accompanying driving of the actuators, and the plurality of actuators A light emitting display device comprising: a driving unit that individually drives the light emitting device.   The light emitting display device according to claim 1, wherein the plurality of actuators are connected to each other via a flexible connecting member.   The light emitting display device according to claim 1, wherein the periphery of each actuator is covered with a light shielding member.   The light-emitting display device according to claim 1, wherein the plurality of actuators are set on a wiring board, and a surface of the stress light-emitting body provided at an end of the actuator is covered with a protective film.

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