JP2009218148A - Electrode draw-out structure and plane light-emitting device equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To secure an enough luminous panel area of a plane light-emitting device, when drawing out each inner electrode of unit light-emitting elements 7 outside by the use of electrode terminals, to protect a thin structure of the device as much as possible by using simple outside wiring construction and by locating each light-emitting element reasonably close to each other. <P>SOLUTION: The device is so constructed that an inner electrode 21 of each of the plurality of unit light-emitting elements 7 is drawn outside by the use of common electrode-draw-out terminals 9, with the inner electrode 21 itself of each of the plurality of adjoining unit light-emitting elements 7 as an individual electrode-draw-out terminal 11 or with a conductive member connected to the inner electrode as an individual electrode-draw-out terminal 11, the individual electrode-draw-out terminals 11 are drawn out to opposed gaps surrounded by peripheral-face corners 7a of the plurality of unit light-emitting elements 7 and are mutually opposed, and the common electrode-draw-out terminals 9 are press-fit into and among the individual electrode-draw-out terminals 11 in the gaps. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a planar light emitting device used as an image forming apparatus, a liquid crystal backlight, or the like. More specifically, a plurality of unit light emitting elements having a rectangular outer peripheral surface are arranged adjacent to each other in both vertical and horizontal directions. The planar light emitting device according to the present invention relates to a structure in which the internal electrode of each unit light emitting element is led out to the outside using an electrode lead terminal.

  In a planar light emitting device as an image forming apparatus, the entire outer peripheral surface shape is a rectangular frame shape, and a plurality of unit light emitting elements whose outer peripheral surface shape is a rectangular shape or other shapes are vertically and horizontally arranged in the rectangular frame shape. There is one that is arranged adjacent to each other in both directions and controls the light emission and non-light emission of these unit light emitting elements (see Patent Document 1).

  Each of the plurality of unit light-emitting elements used in such a planar light-emitting device includes a front panel and a rear panel facing each other with the same external shape in plan view, and between the outer peripheral edges between the panels. The inside is sealed with the side panel interposed between the two, and the light emission source is installed in the inside.

When an external lead terminal for performing power supply control such as voltage application is drawn to the internal electrode of each unit light emitting device in such a planar light emitting device, it may hinder the overall thickness of the planar light emitting device. It is also desirable that the wiring configuration from the exterior is as simple as possible and does not cause inconvenience in handling. Furthermore, when a high voltage is applied to the internal electrode, it is necessary to electrically insulate the lead end portion of the electrode lead terminal.
JP 2007-280635 A

  Therefore, the problem to be solved by the present invention is that the planar light emitting device as described above has a thin structure of the entire planar light emitting device when the internal electrode of each unit light emitting element is pulled out using the electrode lead terminal. The light emitting panel as a planar light emitting device can be arranged in a relatively close state to the surrounding unit light emitting elements, while the external wiring configuration is simplified while the unit light emitting element is kept in close contact with the surrounding unit light emitting elements. The purpose is to ensure a sufficient area.

  An electrode lead structure of a planar light emitting device according to the present invention relates to a planar light emitting device in which a plurality of unit light emitting elements having an outer peripheral surface rectangular shape are adjacent to each other and arranged in both vertical and horizontal directions or in a vertical direction or a horizontal direction. The structure is such that the internal electrode of each unit light emitting element is pulled out to the outside using an electrode lead terminal, and the internal electrode of each of the plurality of adjacent unit light emitting elements itself is used as an individual electrode lead terminal or connected to the internal electrode. The members are used as individual electrode lead terminals, and the individual electrode lead terminals are drawn out to opposing gaps surrounding each other at the corners of the outer peripheral surface of the plurality of adjacent unit light emitting elements or in the vicinity thereof. By pressing the common electrode lead terminal between the opposing faces of a plurality of individual electrode lead terminals, the common electrode lead terminal Serial plurality of individual electrode lead terminal are commonly connected, and derive the internal electrodes of the plurality of unit light-emitting element to the outside, it is characterized in.

  The planar light emitting device is an image forming device that controls the light emission of each unit light emitting element to form an image as a whole, or a backlight that is disposed on the back side of the liquid crystal display panel to illuminate the liquid crystal display panel. Etc. can be applied.

  In the present invention, when the internal electrode of each unit light emitting element is led out to the outside using an individual and common electrode lead terminal, a plurality of individual electrode lead terminals from each unit light emitting element are connected to the outer peripheral surface corner of the unit light emitting element. The plurality of individual electrode lead-out terminals are connected to each other by pressing the common electrode lead-out terminals between the opposing individual electrode lead-out terminals. Are connected in common and the internal electrodes of the plurality of unit light emitting elements are drawn out to the outside, so that the thin structure of the entire planar light emitting device is not hindered, and at the same time, there is an external wiring configuration for applying a voltage to the electrodes. The light-emitting panel as a planar light-emitting device can be simplified and the unit light-emitting elements themselves can be arranged in a relatively close state to the surrounding unit light-emitting elements. It is possible to sufficiently secure the product.

  In the present invention, a preferred embodiment is that the outer peripheral surface corner portions of each of the plurality of unit light emitting elements are chamfered so that the press-fitting space of the common electrode lead-out terminal is formed in the opposing gap surrounded by the outer peripheral surface corner portions. It is to secure.

  In this aspect, the opposing gaps surrounded by the opposing outer peripheral surface corners of the unit light emitting elements are widened, but the unit light emitting elements are closely arranged vertically and horizontally with respect to each other even if the opposing gaps exist. With this arrangement, the dark area is reduced in the surface light emission by the entire unit light emitting element, and the light emission quality or display quality can be improved.

  In another preferred embodiment of the present invention, the unit light-emitting element is formed between the front and rear panels facing each other with the same rectangular shape in plan view and the outer peripheral edge between the panels. The inside is sealed with an intervening side panel, a phosphor and an internal electrode are provided on the inner surface of the front panel, and a field emission type light emitting element is provided which has an electron emitter on the inner surface of the rear panel. This is because the outer peripheral surface corner portion of the light emitting element is chamfered, and the individual electrode lead-out terminal is drawn out from the outer peripheral surface corner portion between the front panel and the side panel.

  In the present invention, another preferred embodiment is that a phosphor is provided on the inner surface of the front panel, a metal back is provided on the phosphor, and the metal back is used as an internal electrode also serving as an anode.

  A planar light emitting device according to the present invention is a planar light emitting device in which a plurality of unit light emitting elements having a rectangular shape on the outer peripheral surface are adjacent to each other and arranged in both vertical and horizontal directions, or in a vertical direction or a horizontal direction. In the electrode lead-out structure according to the invention, the internal electrode of each unit light-emitting element is drawn out.

  In the electrode lead-out structure in the planar light emitting device of the present invention, light emission as the planar light emitting device is achieved so as not to obstruct the thin structure of the entire planar light emitting device as much as possible, and to simplify the external wiring configuration. In order to ensure a sufficient panel area, the internal electrodes of the respective unit light emitting elements can be drawn to the outside using the electrode lead terminals.

  Hereinafter, an electrode lead structure of a planar light emitting device according to an embodiment of the present invention and a planar light emitting device having the structure will be described with reference to the accompanying drawings. FIG. 1 is an external view of the planar light emitting device. 2 shows a planar configuration of the planar light emitting device, FIG. 3 (a) shows a cross-sectional configuration along the line AA in FIG. 2, and FIG. 3 (b) shows a line BB in FIG. FIG. 4 is an exploded view of components of the planar light emitting device. FIG. 5A is a perspective view showing a state before the common electrode lead-out terminal is inserted into the opposing gap at the corner portion of the outer peripheral surface of the unit light emitting element, and FIG. 5B is a perspective view showing the inserted state. Fig. 6B is a cross-sectional configuration view showing a state before the common electrode lead terminal is inserted into the opposing gap at the corner portion of the outer peripheral surface of the unit light emitting element, and Fig. 6B shows the inserted state in a sectional configuration.

  With reference to these drawings, the planar light emitting device 1 according to the embodiment includes a device housing 5 having a housing recess 3 and a plurality of 9 in this example housed in the housing recess 3 of the device housing 5. Each unit light emitting element 7 and a conductive common electrode lead terminal 9 for drawing out the internal electrode of the unit light emitting element 7 to the outside are provided. The unit light emitting elements 7 have a rectangular shape on the outer peripheral surface, and are arranged in both vertical and horizontal directions in a state of being adjacent to the housing recess 3 of the apparatus housing 5.

  Each unit light-emitting element 7 housed in the housing recess 3 of the device housing 5 has its outer peripheral surface corner portion 7a chamfered such as a C-surface cut, so that the outer peripheral surface corner portion 7a A counter gap 8 is formed between them. This chamfered shape can be appropriately determined by experimental trial production or the like. In the case of the facing gap 8, it is a gap that can exist even if the unit light emitting elements 7 are arranged closely in the vertical and horizontal directions.

  From each unit light emitting element 7, the other end side of the individual electrode lead terminal 11 made of an Invar alloy or the like having a rectangular cross section connected to the internal electrode at one end side is opposed to the opposing gap 8. The individual electrode lead terminal 11 is integrated with the unit light emitting element 7. In each unit light emitting element 7, the tip end side 11a on the other end side of each of the individual electrode lead terminals 11 protruding to the outside is bent diagonally downward so as to be elastically restored.

  In the opposing space 12 in which the tip end sides 11a of the individual electrode lead terminals 11 are opposed to each other, a cross-sectional circle having a larger cross-sectional area than the cross-sectional shape of the opposing space 12 or an elliptical shape is used. A conductive common electrode lead terminal 9 having an appropriate cross-sectional shape corresponding to the shape of the facing space 12 is inserted. By this insertion, the common electrode lead terminal 9 comes into elastic contact with the distal end side 11a of each of the plurality of surrounding individual electrode lead terminals 11. In this case, each of the plurality of individual electrode lead terminals 11 is connected in common in good electrical contact with each other via the common electrode lead terminal 9 by the action of the elastic restoring force between the tip ends 11a.

  The common electrode lead terminal 9 is not limited to the shape of the circular cross section, the elliptical cross section, the rectangular cross section, or the like, but can be easily inserted into the facing space 12 between the distal end sides 11a of the plurality of individual electrode lead terminals 11. On the other hand, in order to make it difficult to pass through, the illustration is omitted. However, for example, a shape having a small diameter on the lower end side and an upper end side and a diameter in the middle part gradually or stepwise may be used. In such a shape, the common electrode lead terminal 9 can be easily inserted into the space 12 at the lower end side, but once inserted, the outer end surface of the common electrode lead terminal 11 is suppressed by the individual electrode lead terminal 11 so that the common electrode lead terminal 9 is difficult to come out from the space 12. It is preferable. Alternatively, while gradually increasing the diameter from the upper end side to the lower end side to make it difficult to come out, the lower end side tip portion may have a small diameter to ensure ease of insertion. Alternatively, the common electrode lead terminal 9 may be configured to be prevented from coming off by forming a return hook on the lower end side so that the common electrode lead terminal 9 can be prevented from falling out of the facing space 12.

  Since the connection between each of the plurality of individual electrode lead terminals 11 and the common electrode lead terminal 9 is performed in the facing gap 8 surrounded by the outer peripheral surface corner portion 7a of the adjacent unit light emitting elements 7, the adjacent unit light emitting elements 7 are connected to each other. The light emitting states of these unit light emitting elements 7 can be arranged close to each other vertically and horizontally, and a high quality light emitting state with few dark portions can be obtained.

  The unit light emitting element 7 described above is disposed between the front and rear panels 13 and 15 facing each other in the same rectangular shape in plan view, and between the outer peripheral edges between the panels 13 and 15. The inside of the front panel 13 is vacuum sealed, the phosphor 19, the anode and the internal electrode 21 serving as a metal back are provided on the inner surface of the front panel 13, and the electron emitter 23 is provided on the inner surface of the rear panel 15. It is a radiation type light emitting element.

  In each unit light emitting element 7, the outer panel surface of the front panel 13 is a light emitting panel surface 13 a, the outer panel surface of the rear panel 15 is a non-light emitting panel surface 15 a, and the internal electrode 21 is non-light emitting by the individual electrode lead terminal 11. The panel surface 15a is pulled out.

  The unit light emitting element 7 is not limited to the field emission light emitting element, and a light emitting diode, an organic EL, and other light emitting sources may be disposed as the internal light emitting source. The internal electrodes in these light emitting sources are not limited to high voltages, and can include electrodes that apply a low voltage.

  In the above configuration, the internal electrode 21 of each of the adjacent unit light emitting elements 7 is connected in common via the individual electrode lead terminal 11 and the common electrode lead terminal 9 so that, for example, one location provided in the apparatus housing 5 When a voltage is applied from the voltage application terminal 5a, it is possible to control the voltage application to the unit light emitting element 7 of the entire planar light emitting device 1, and this voltage wiring can be simplified. .

  In this way, the internal electrodes 21 of the adjacent unit light emitting elements 7 are connected in common by the plurality of individual electrode lead terminals 11 and the common electrode lead terminals 9, so that the unit light emitting elements 7 are in close contact with each other. The light emitting state by the unit light emitting element 7 can be housed in the housing 5, and the dark portion becomes smaller, and the light emission quality can be improved.

  In the above-described embodiment, the planar light emitting device 1 emits light by itself, and controls the voltage applied to the internal electrode 21 through the common electrode lead terminal 9 so that the image forming apparatus displays an image. For example, it can be used as a backlight that is arranged on the back side of the liquid crystal display panel to illuminate the liquid crystal display panel. In addition to the liquid crystal display panel, the display panel may be a plasma display (PDP), a light emitting diode display, an organic or inorganic EL display, a field emission display (FED), an electroluminescence display, a fluorescent display tube display, or other various display panels. Can be applied.

  As described above, in the present embodiment, the internal electrode 21 of each of the plurality of adjacent unit light emitting elements 7 is used as the individual electrode lead terminal 11 or a conductive member connected to the internal electrode 21 is used as the individual electrode lead terminal 11. As described above, the individual electrode lead-out terminals 11 are drawn out to face each other between the outer peripheral surfaces of the adjacent unit light-emitting elements 7 and are opposed to each other, and are opposed to each other. The common electrode lead terminal 9 is press-fitted between the electrode lead terminals 11 so that the plurality of individual electrode lead terminals 11 are commonly connected by the common electrode lead terminal 9 and the internal electrodes 21 of the plurality of unit light emitting elements 7 are externally connected. Since the structure is drawn out, the thin structure of the entire planar light emitting device 1 can be secured, while the voltage is applied to the electrodes at the same time. In addition, the configuration of the external wiring can be simplified, and the unit light-emitting elements 7 themselves can be arranged in a relatively close state with the surrounding unit light-emitting elements 7 to sufficiently secure a light-emitting panel area as a planar light-emitting device. become able to.

FIG. 1 is a view showing the appearance of a planar light emitting device to which an electrode lead structure according to an embodiment of the present invention is applied. FIG. 2 is a diagram illustrating a planar configuration of the planar light emitting device. 3A shows a cross-sectional configuration along the line AA in FIG. 2, and FIG. 3B shows a cross-sectional configuration along the line BB in FIG. FIG. 4 is an exploded view showing components of the planar light emitting device. FIG. 5A is a perspective view showing a state before the common electrode lead-out terminal is inserted into the opposing gap at the corner portion of the outer peripheral surface of the unit light emitting element, and FIG. 5B is a perspective view showing the inserted state. FIG. 6A is a diagram showing a cross-sectional configuration of the unit light emitting element before the common electrode lead-out terminal is inserted into the opposing gap of the outer peripheral surface corner portion, and FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Planar light-emitting device 3 Storage recessed part 5 Unit housing 7 Unit light emitting element 9 Common electrode lead-out terminal 11 Individual electrode lead-out terminal 13 Front panel 13a Light emission panel surface 15 Rear panel 15a Non-light emission panel surface 17 Side panel 19 Phosphor 21 Anode 21 metal Back (internal electrode)
23 Electron emitter

Claims (5)

Regarding a planar light emitting device in which a plurality of unit light emitting elements having a rectangular shape on the outer peripheral surface are arranged adjacent to each other in both vertical and horizontal directions, or in a vertical direction or a horizontal direction, internal electrodes of each unit light emitting element are used by using electrode lead terminals. It is a structure that pulls out to the outside,
Each of the adjacent unit light emitting elements has the internal electrode itself as an individual electrode lead terminal, or a conductive member connected to the internal electrode as an individual electrode lead terminal, and the individual electrode lead terminal is used as the plurality of adjacent unit light emitting elements. In the outer peripheral surface of the element, it is drawn out to the opposing gap surrounding the outer peripheral surface corner portion or in the vicinity thereof and opposed to each other, and the common electrode lead terminal is press-fitted between the opposing faces of the plurality of individual electrode lead terminals, An electrode lead structure for a planar light emitting device, wherein the plurality of individual electrode lead terminals are connected in common by a common electrode lead terminal, and the internal electrodes of the plurality of unit light emitting elements are led to the outside.   2. The press-fitting space for the common electrode lead-out terminal is secured in the facing gap surrounded by the outer peripheral surface corner portions by chamfering the opposing outer peripheral surface corner portions of the plurality of unit light emitting elements. Structure.   The unit light-emitting element is internally composed of a front panel and a rear panel facing each other in the same rectangular shape in plan view, and a side panel interposed between outer peripheral edges between the panels. This is a field emission type light emitting device that is sealed and has a phosphor and internal electrodes on the inner surface of the front panel and an electron emitter on the inner surface of the rear panel. The corner of the outer peripheral surface of the light emitting device is chamfered. 3. The structure according to claim 1, wherein an individual electrode lead terminal is led out from the corner portion of the outer peripheral surface between the front panel and the side panel.   The structure according to claim 3, wherein a phosphor is provided on the inner surface of the front panel, a metal back is provided on the phosphor, and the metal back is used as an internal electrode serving as an anode.   5. A planar light emitting device in which a plurality of unit light emitting elements having a rectangular shape on the outer peripheral surface are adjacent to each other and arranged in both vertical and horizontal directions, or in a vertical direction or in a horizontal direction, and the light emitting device according to claim 1. A planar light emitting device characterized in that an internal electrode of each unit light emitting element is drawn out in the structure.

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