JP6244754B2 - Light emitting device and light source device - Google Patents

Description

  The present invention relates to a light emitting device and a light source device including the light emitting device.

  In recent years, a “curved surface display” that can be installed on a cylinder or the like and can display an image on a curved surface has been developed (see, for example, Patent Document 1).

JP2013-134295A

  However, until now, no light-emitting device suitable as an edge-light type backlight source for curved display has been proposed.

  Therefore, the present invention has been made in view of such circumstances, and an object thereof is to provide a light emitting device or a light source device suitable as an edge light type backlight light source for curved display.

  In order to solve the above-described problems, a light-emitting device of the present invention includes a light-emitting element and a light-reflective enclosure that opens to the front and surrounds the light-emitting element, and the opening of the enclosure has a front view. It is characterized by being formed in an arc shape.

  According to the light emitting device of the present invention, since the light emitting region is formed in an arc shape, light can be preferably incident on the light guide plate for curved display.

It is a schematic front view of the light source device which concerns on one embodiment of this invention. It is the schematic front view (a) of the light-emitting device which concerns on one embodiment of this invention, and the schematic sectional drawing (b) in the AA cross section.

  Hereinafter, embodiments of the invention will be described with reference to the drawings as appropriate. However, the light emitting device and the light source device described below are for embodying the technical idea of the present invention, and the present invention is not limited to the following unless otherwise specified. In addition, the size, positional relationship, and the like of members illustrated in each drawing may be exaggerated for clarity of explanation.

<Embodiment 1>
1 is a schematic front view of a light source device according to Embodiment 1. FIG. 2A is a schematic front view of the light-emitting device according to Embodiment 1, and FIG. 2B is a schematic cross-sectional view showing the AA cross section in FIG. The “front” of the light emitting device or the light source device is a main surface facing the main light emitting direction of the light emitting device or the light source device.

  As shown in FIG. 1, the light source device 200 includes a plurality of light emitting devices 100 provided on a substrate 150. In this example, the substrate 150 is a flexible substrate.

  As shown in FIG. 2, the light emitting device 100 includes a light emitting element 10 and a light reflective enclosure 20. The enclosure 20 is open to the front and surrounds the light emitting element 10. The opening 25 of the enclosure is formed in an arc shape when viewed from the front.

  More specifically, in the light emitting device 100, the light emitting element 10 is a light emitting diode chip. The envelope body 20 is a white resin molded body that constitutes a package, and is integrally formed with positive and negative lead electrodes that are electrically connected to the light emitting element 10. That is, the opening 25 of the enclosure is an opening of a recess that accommodates the light emitting element 10 of the package. The concave portion of the package is filled with a sealing member made of a translucent resin containing phosphor after accommodating the light emitting element 10. Thus, the opening 25 of the enclosure can be regarded as the main light emitting region of the light emitting device 100 in a front view.

  In the light emitting device 100 having the above-described configuration, since the light emitting region is formed in an arc shape, light can be preferably incident on the light guide plate for curved display. In particular, it is more preferable that the opening 25 of the enclosure is formed so as to follow the curved shape of the end face of the light guide plate in front view.

  In the example shown in the drawing, the opening 25 of the enclosure of the light emitting device 100 has a shape having a longitudinal direction and a short side direction when viewed from the front, and is curved toward the short side direction. Specifically, the shape of the opening 25 in a front view includes a rectangular shape, a rectangular shape with rounded corners, an elliptical shape, and the like, and these basic shapes are bent in an arc shape. However, the shape of the opening 25 is not limited to this, and the shape of the opening 25 in a front view may be curved as a whole, that is, like an arc, and for example, the width in the lateral direction may partially change. Further, the opening 25 of the enclosure of the light emitting device 100 is formed in a convex arc shape downward (mounting surface side; substrate 150 side) in a front view, but is formed in a convex arc shape upward. May be.

  In the illustrated example, in one light emitting device 100, the enclosure 20 has one opening 25, but may have a plurality of openings 25. In a single light emitting device 100, when the enclosure 20 has a plurality of openings 25, the combination of the plurality of openings 25 only needs to be formed in an arc shape in front view.

  As shown in FIG. 1, when the substrate 150 is bent, the plurality of light emitting devices 100 are arranged so that the opening 25 of the enclosure in each light emitting device 100 follows one arc when viewed from the front. Yes.

  However, the present invention is not limited to this. For example, when the substrate 25 is a rigid substrate, a plurality of light emitting devices 100 are provided on the substrate 25 so that the opening 25 of the enclosure in each light emitting device 100 follows one arc when viewed from the front. May be arranged.

  Since the light source device 200 having the above-described configuration is formed so that the light emitting region of each light emitting device 100 follows one arc, light can be preferably incident on the light guide plate for curved display. . In particular, the plurality of light emitting devices 100 are arranged such that when the substrate 150 is bent, the opening 25 of the enclosure in each light emitting device 100 follows the curved shape of the end surface of the light guide plate in front view. Still good.

  As shown in FIG. 2, the light emitting device 100 is preferably a side light emitting device (also referred to as “side view type”). If the light emitting device 100 is a side light emitting type, the flexible substrate 25 is bent in the thickness direction so that the plurality of light emitting devices 100 are aligned along the curved shape of the end surface of the light guide plate for curved display. Can be juxtaposed relatively easily. In addition, when the light-emitting device 100 is a side light emission type, the side surface which has the opening 25 of an enclosure becomes a front, and it is the same also in the light source device 200 with which the light-emitting device 100 was mounted on the board | substrate 25.

  However, the present invention is not limited to this, and the light emitting device 100 may be a top emission type (also referred to as “top view type”) light emitting device. In this case, the substrate 25 is preferably formed in an arc shape when viewed from the front.

  As shown in FIG. 2, in the side-emitting type light emitting device 100, the outer surface of the enclosure 20 forms a part of the outer surface of the light emitting device 100, and the upper surface (upper outer surface) of the enclosure 20 in a front view. Is narrower than the lower surface (lower outer surface). Thereby, when arranging the plurality of light emitting devices 100 on the substrate 25 as described above, it is easy to avoid interference between the light emitting devices 100 and other peripheral members, so that the plurality of light emitting devices 100 are arranged at small intervals. Easy to place. Further, the outer surface of the enclosure 20 may be arcuate in front view like the opening 25, and the upper surface of the enclosure 20 is the outline of the opening 25 in front view as shown by a broken line in FIG. You may curve so that. Thereby, it is easy to avoid interference with other members around the light emitting device 100, and the light source device can be easily formed in a small size.

  Hereafter, each component of the light-emitting device and light source device of this invention is demonstrated.

(Light emitting element 10)
As the light emitting element, a semiconductor element such as a light emitting diode chip or a semiconductor laser chip can be used. In particular, a light-emitting element of a nitride semiconductor (In _x Al _y Ga _1-xy N, 0 ≦ x, 0 ≦ y, x + y ≦ 1) that can excite the phosphor efficiently is preferable. In addition, a gallium arsenide semiconductor device or a gallium phosphorus semiconductor device may be used. The light emitting element is connected to positive and negative lead electrodes and wirings by wires and adhesives. The number of light emitting elements provided in one opening of one light emitting device or enclosure may be one or more. In addition, one light emitting device may be provided with light emitting elements having different emission colors such as blue, green, and red light emission. The shape of the light emitting element in a front view may be a square shape or a rectangular shape, but it can also be formed in an arc shape like the opening of the enclosure, thereby improving the mounting property in the opening and the light emitting characteristics of the light emitting device. Can do.

(Enclosure 20)
The envelope includes a resin molded body of the package, a form of a covering member that directly covers the light emitting element, and a form of a frame provided on the wiring board. The enclosure can use a thermosetting resin such as an epoxy resin or a silicone resin, or a thermoplastic resin such as a polyamide resin, a polycyclohexane terephthalate resin, or a liquid crystal polymer as a base material. The enclosure preferably contains particles such as silica, titanium oxide, calcium silicate, potassium titanate, and glass as a filler in these base materials. The light reflectance of the enclosure is preferably 75% or more, and more preferably 90% or more, at the emission wavelength of the light emitting element.

  The inside of the enclosure may be sealed with a sealing member such as a silicone resin. Furthermore, the sealing member can contain various phosphors such as YAG, CASN, sialon, and silicate that are excited by the light emitting element, thereby obtaining light emitting devices of various emission colors such as white.

(Substrate 150)
A board | substrate is a circuit board provided with the electrical circuit. A light emitting device is mounted on the substrate using various solders and conductive pastes. For the substrate, ceramics such as aluminum oxide and aluminum nitride, metals such as copper and aluminum or alloys thereof, glass epoxy, various resins, and the like can be used as a base material. Examples of the flexible substrate include a base material made of a resin such as polyimide or polyethylene terephthalate, or a metal such as copper, aluminum, or an alloy thereof. Note that the electrical circuit of the substrate can be designed as appropriate.

  The light emitting device and the light source device according to the present invention include an edge light type backlight light source for curved display, various display devices such as advertisements and destination guides, various lighting devices, image reading devices in copiers and scanners, and projectors. It can be used as a light source for an apparatus or the like.

  DESCRIPTION OF SYMBOLS 10 ... Light emitting element, 20 ... Enclosure (25 ... opening), 100 ... Light-emitting device, 150 ... Board | substrate, 200 ... Light source device

Claims (3)

A light emitting element, and a light reflective enclosure surrounding said light emitting element is open at the front, a light-emitting device downward implementation-side der in front view,
The opening of the enclosure is a light emitting device that is formed in an arc shape that protrudes downward or upward in a front view.   A plurality of light emitting devices according to claim 1 are provided on a flexible substrate, and when the substrate is bent, the opening of the enclosure in each light emitting device follows a single arc when viewed from the front. Light source devices arranged in   A light source device comprising a plurality of light emitting devices according to claim 1 arranged on a substrate so that the openings of the enclosures in each of the light emitting devices follow one arc in a front view.

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