JP2010232529A - Light emitting device, and backlight device - Google Patents

Light emitting device, and backlight device Download PDF

Info

Publication number
JP2010232529A
JP2010232529A JP2009080096A JP2009080096A JP2010232529A JP 2010232529 A JP2010232529 A JP 2010232529A JP 2009080096 A JP2009080096 A JP 2009080096A JP 2009080096 A JP2009080096 A JP 2009080096A JP 2010232529 A JP2010232529 A JP 2010232529A
Authority
JP
Japan
Prior art keywords
light
led element
cavity
phosphor
light emitting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2009080096A
Other languages
Japanese (ja)
Inventor
Takayoshi Yajima
孝義 矢嶋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyoda Gosei Co Ltd
Original Assignee
Toyoda Gosei Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyoda Gosei Co Ltd filed Critical Toyoda Gosei Co Ltd
Priority to JP2009080096A priority Critical patent/JP2010232529A/en
Publication of JP2010232529A publication Critical patent/JP2010232529A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732—Location after the connecting process
    • H01L2224/73251—Location after the connecting process on different surfaces
    • H01L2224/73265—Layer and wire connectors

Landscapes

  • Liquid Crystal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Led Device Packages (AREA)
  • Led Devices (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device capable of efficiently exciting a red phosphor even when a blue LED element, a green LED element and the red phosphor are used, and suppressing variation of an emission color due to heat generation in use, and to provide a backlight device. <P>SOLUTION: Light enters into an end face 102 of a light guide plate 101 from this light emitting device 1 including: a first cavity 21 wherein a first LED element 11 for emitting blue light and a first phosphor 31 for emitting red light when excited by blue light are arranged; and a second cavity 22 having a second LED element 12 for emitting green light and a second phosphor 32 for emitting red light when excited by green light arranged therein, and formed independently of the first cavity 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、青色光を発するＬＥＤ素子と、緑色光を発するＬＥＤ素子と、赤色光を発する蛍光体と、を備えた発光装置及びバックライト装置に関する。   The present invention relates to a light emitting device and a backlight device including an LED element that emits blue light, an LED element that emits green light, and a phosphor that emits red light.

従来、青色ＬＥＤ素子と、緑色ＬＥＤ素子と、赤色蛍光体と、が１つのキャビティ内に配された発光装置が知られている（特許文献１参照）。この発光装置によれば、青色ＬＥＤ素子から発せられる青色光及び緑色ＬＥＤ素子から発せられる緑色光により、赤色蛍光体を励起して赤色光を生成する。   Conventionally, a light emitting device in which a blue LED element, a green LED element, and a red phosphor are arranged in one cavity is known (see Patent Document 1). According to this light emitting device, the red phosphor is excited by the blue light emitted from the blue LED element and the green light emitted from the green LED element to generate red light.

特開２００７−１５８２９６号公報JP 2007-158296 A

しかしながら、特許文献１の発光装置では、１つのキャビティに青色ＬＥＤ素子及び緑色ＬＥＤ素子が配されているため、キャビティ内の赤色蛍光体を均一に励起することができない。すなわち、２つのＬＥＤ素子の間に配される赤色蛍光体は、２つのＬＥＤ素子から発せられる光、熱等の影響を受けるが、いずれか一方のＬＥＤ素子にのみ近接している赤色蛍光体は、１つのＬＥＤ素子から発せられる光、熱等の影響を受ける。   However, in the light emitting device of Patent Document 1, since the blue LED element and the green LED element are arranged in one cavity, the red phosphor in the cavity cannot be excited uniformly. That is, the red phosphor disposed between the two LED elements is affected by light, heat, etc. emitted from the two LED elements, but the red phosphor that is close to only one of the LED elements is It is affected by light, heat, etc. emitted from one LED element.

このため、２つのＬＥＤ素子の間に配される赤色蛍光体については、過度の励起光が照射されたり加熱によって発光特性が悪化する傾向にあり、一方のＬＥＤ素子にのみ近接している赤色蛍光体については、他方のＬＥＤ素子からの光が十分に照射されない。これにより、赤色蛍光体の励起効率が低下し、使用時の発熱により発光色が変化してしまうという問題点があった。   For this reason, the red phosphor disposed between the two LED elements tends to be deteriorated in light emission characteristics due to excessive excitation light irradiation or heating, and is close to only one LED element. About a body, the light from the other LED element is not fully irradiated. As a result, the excitation efficiency of the red phosphor decreases, and there is a problem that the emission color changes due to heat generation during use.

本発明は、前記事情に鑑みてなされたものであり、その目的とするところは、青色ＬＥＤ素子、緑色ＬＥＤ素子及び赤色蛍光体を用いる場合であっても、赤色蛍光体を効率よく励起することができ、色度調整用のフィードバック回路が不要で使用時の発熱による発光色の変化を抑制することのできる高い色度再現性を有する発光装置及びバックライト装置を提供することにある。   The present invention has been made in view of the above circumstances, and an object thereof is to efficiently excite a red phosphor even when a blue LED element, a green LED element and a red phosphor are used. It is an object of the present invention to provide a light emitting device and a backlight device having high chromaticity reproducibility that can suppress a change in emitted color due to heat generation during use without using a feedback circuit for chromaticity adjustment.

前記目的を達成するため、本発明は、青色光を発する第１ＬＥＤ素子と、前記青色光により励起されると赤色光を発する第１蛍光体と、が配された第１キャビティと、緑色光を発する第２ＬＥＤ素子と、前記青緑色光又は緑色光により励起されると赤色光を発する第２蛍光体と、が配され、前記第１キャビティと独立して形成される第２キャビティと、を備えた発光装置が提供される。   In order to achieve the above object, the present invention provides a first cavity in which a first LED element that emits blue light, a first phosphor that emits red light when excited by the blue light, and a green light. A second cavity that emits red LED light when excited by the blue-green light or green light, and is formed independently of the first cavity. A light emitting device is provided.

上記発光装置において、前記第１ＬＥＤ素子の半導体層、前記第２ＬＥＤ素子の半導体層、前記第１蛍光体及び前記第２蛍光体は、全て窒化物系材料から構成されることが好ましい。   In the light emitting device, it is preferable that the semiconductor layer of the first LED element, the semiconductor layer of the second LED element, the first phosphor, and the second phosphor are all made of a nitride-based material.

上記発光装置において、前記第１ＬＥＤ素子と、前記第２ＬＥＤ素子は、互いに独立して駆動されることが好ましい。   In the light emitting device, it is preferable that the first LED element and the second LED element are driven independently of each other.

また、本発明は、上記発光装置と、前記発光装置から発せられる光が端面から入射する導光板と、を備えたバックライト装置が提供される。   In addition, the present invention provides a backlight device including the light emitting device and a light guide plate on which light emitted from the light emitting device is incident from an end surface.

上記バックライト装置において、前記発光装置の前記第１キャビティと前記第２キャビティは、前記導光板の厚さ方向に並べられ、前記導光板は、表面が発光面をなし、裏面が反射面をなし、前記第１キャビティが前記導光板の発光面側に配置され、前記第２キャビティが前記導光板の反射面側に配置されることが好ましい。   In the backlight device, the first cavity and the second cavity of the light emitting device are arranged in the thickness direction of the light guide plate, and the light guide plate has a light emitting surface on the front surface and a reflective surface on the back surface. Preferably, the first cavity is disposed on the light emitting surface side of the light guide plate, and the second cavity is disposed on the reflective surface side of the light guide plate.

本発明によれば、青色ＬＥＤ素子、緑色ＬＥＤ素子及び赤色蛍光体を用いる場合であっても、赤色蛍光体を効率よく励起することができ、使用時の発熱による発光色の変化を抑制することができる。   According to the present invention, even when a blue LED element, a green LED element, and a red phosphor are used, the red phosphor can be excited efficiently and a change in emission color due to heat generation during use can be suppressed. Can do.

図１は、本発明の一実施形態を示す発光装置の模式平面図である。FIG. 1 is a schematic plan view of a light emitting device showing an embodiment of the present invention. 図２は、バックライト装置の模式断面図である。FIG. 2 is a schematic cross-sectional view of the backlight device. 図３は、発光装置の制御ブロック図である。FIG. 3 is a control block diagram of the light emitting device. 図４は、発光装置により調整可能な色度範囲を示した色度図である。FIG. 4 is a chromaticity diagram showing a chromaticity range that can be adjusted by the light emitting device. 図５は、変形例を示すバックライト装置の模式断面図である。FIG. 5 is a schematic cross-sectional view of a backlight device showing a modification.

図１は本発明の一実施形態を示す発光装置の模式平面図である。
図１に示すように、この発光装置１は、青色光を発する第１ＬＥＤ素子１１と、緑色光を発する第２ＬＥＤ素子１２と、第１ＬＥＤ素子１１が配される凹状の第１キャビティ２１及び第２ＬＥＤ素子１２が配される凹状の第２キャビティ２２を有するケース２０と、を備えている。第１キャビティ２１には、第１蛍光体３１が分散された第１封止材４１が充填され、第２キャビティ２２には、第２蛍光体３２が分散された第１封止材４２が充填される。第１蛍光体３１は、第１ＬＥＤ素子１１から発せられる青色光により励起されると赤色光を発する。また、第２蛍光体３２は、第２ＬＥＤ素子１２から発せられる緑色光により励起されると赤色光を発する。 FIG. 1 is a schematic plan view of a light emitting device showing an embodiment of the present invention.
As shown in FIG. 1, the light emitting device 1 includes a first LED element 11 that emits blue light, a second LED element 12 that emits green light, a concave first cavity 21 and a second LED in which the first LED element 11 is disposed. And a case 20 having a concave second cavity 22 in which the element 12 is disposed. The first cavity 21 is filled with the first sealing material 41 in which the first phosphor 31 is dispersed, and the second cavity 22 is filled with the first sealing material 42 in which the second phosphor 32 is dispersed. Is done. The first phosphor 31 emits red light when excited by the blue light emitted from the first LED element 11. The second phosphor 32 emits red light when excited by the green light emitted from the second LED element 12.

また、発光装置１は、ケース２０の第１キャビティ２１の底面に露出し互いに離隔して配置された金属製の第１リード５１及び第２リード５２と、第２キャビティ２２の底面に露出し互いに離隔して配置された金属製の第３リード５３及び第４リード５４と、を備えている。第１ＬＥＤ素子１１は第１リード５１に搭載され、第２ＬＥＤ素子１２は第３リード５２に搭載される。各ＬＥＤ素子１１，１２と各リード５１，５２，５３，５４とは、それぞれワイヤ５５により接続される。   In addition, the light emitting device 1 is exposed on the bottom surface of the first cavity 21 of the case 20 and spaced from each other, and the first and second leads 51 and 52 made of metal are exposed on the bottom surface of the second cavity 22. A third lead 53 and a fourth lead 54 made of metal are provided separately from each other. The first LED element 11 is mounted on the first lead 51, and the second LED element 12 is mounted on the third lead 52. Each LED element 11, 12 and each lead 51, 52, 53, 54 are connected by a wire 55.

第１ＬＥＤ素子１１は、ＩｎｘＡｌｙＧａ１−ｘ−ｙＮ（０≦ｘ≦１，０≦ｙ≦１，０≦ｘ＋ｙ≦１）の式で表される窒化物系半導体層を有する。第１ＬＥＤ素子１１は、青色光を発し、ピーク波長が４５０ｎｍである。ここでいう青色光とは、ピーク波長が４４０−４７０ｎｍの光をいうものとする。 The 1LED element 11 has a In x Al y Ga 1-x -y N nitride semiconductor layer represented by the formula of (0 ≦ x ≦ 1,0 ≦ y ≦ 1,0 ≦ x + y ≦ 1). The first LED element 11 emits blue light and has a peak wavelength of 450 nm. Blue light here means light having a peak wavelength of 440 to 470 nm.

第２ＬＥＤ素子１２は、ＩｎｘＡｌｙＧａ１−ｘ−ｙＮ（０≦ｘ≦１，０≦ｙ≦１，０≦ｘ＋ｙ≦１）の式で表される窒化物系半導体層を有する。第２ＬＥＤ素子１２は、緑色光を発し、ピーク波長が５００ｎｍである。ここでいう緑色光とは、青みがかった緑色光も含み、ピーク波長が４７０−５３０ｎｍの光をいうものとする。 The second LED element 12 has a nitride-based semiconductor layer represented by an expression of In x Al y Ga 1-xy N (0 ≦ x ≦ 1, 0 ≦ y ≦ 1, 0 ≦ x + y ≦ 1). The second LED element 12 emits green light and has a peak wavelength of 500 nm. The green light here means light having a peak wavelength of 470 to 530 nm, including bluish green light.

ケース２０は、全体として略直方体状を呈し、例えば、液晶ポリマ（ＬＣＰ）、ポリフェニレンサルファイド（ＰＰＳ）、シンジオタクチックポリスチレン（ＳＰＳ）、ポリフタルアミド（ＰＰＡ）、ポリアミド（ＰＡ）等の熱可塑性樹脂や、エポキシ樹脂、シリコーン樹脂等の熱硬化性樹脂からなる。尚、ケース２０は、セラミックにより構成することもできる。第１キャビティ２１及び第２キャビティ２２は、平面視にて、それぞれ長方形状に形成される。そして、各ＬＥＤ素子１１，１２は、各キャビティ２１の中央に搭載されている。本実施形態においては、第１キャビティ２１と第２キャビティ２２は、同サイズであり、幅方向に並んで形成される。   The case 20 has a substantially rectangular parallelepiped shape as a whole. For example, a thermoplastic resin such as liquid crystal polymer (LCP), polyphenylene sulfide (PPS), syndiotactic polystyrene (SPS), polyphthalamide (PPA), polyamide (PA), or the like. Or a thermosetting resin such as an epoxy resin or a silicone resin. The case 20 can also be made of ceramic. The first cavity 21 and the second cavity 22 are each formed in a rectangular shape in plan view. Each LED element 11, 12 is mounted at the center of each cavity 21. In this embodiment, the 1st cavity 21 and the 2nd cavity 22 are the same size, and are formed along with the width direction.

第１キャビティ２１及び第２キャビティ２２に充填される第１封止材４１及び第２封止材４２は、エポキシ樹脂、変成エポキシ樹脂、シリコーン樹脂、変成シリコーン樹脂等の熱硬化性樹脂、ガラス等の透光性材料からなる。本実施形態においては、第１封止材４１及び第２封止材４２は、熱硬化型のシリコーン樹脂からなり、第１蛍光体３１及び第２蛍光体３２を含有した状態でポッティングにより第１キャビティ２１及び第２キャビティ２２に充填された後、加熱により硬化される。   The first sealing material 41 and the second sealing material 42 filled in the first cavity 21 and the second cavity 22 are epoxy resin, modified epoxy resin, silicone resin, thermosetting resin such as modified silicone resin, glass, etc. Made of a translucent material. In the present embodiment, the first sealing material 41 and the second sealing material 42 are made of a thermosetting silicone resin, and the first sealing material 41 and the second sealing material 42 contain the first phosphor 31 and the second phosphor 32 and are first potted by potting. After filling the cavity 21 and the second cavity 22, it is cured by heating.

第１蛍光体３１は、ＣａＡｌＳｉＮ３系（希土類で付活されたＣａＡｌＳｉＮ３結晶構造体）であり、窒化物系材料から構成される。第１蛍光体３１は、励起光により励起されると赤色光を発し、発光のピーク波長が６３０ｎｍである。ここでいう赤色光とは、ピーク波長が６２０−６７０ｎｍの光をいうものとする。 The first phosphor 31 is a CaAlSiN 3 system (CaAlSiN 3 crystal structure activated by rare earth) and is made of a nitride material. The first phosphor 31 emits red light when excited by excitation light, and the peak wavelength of light emission is 630 nm. Red light here means light with a peak wavelength of 620-670 nm.

第２蛍光体３２は、第１蛍光体３１とは組成の異なるＣａＡｌＳｉＮ３系（希土類で付活されたＣａＡｌＳｉＮ３結晶構造体）蛍光体であり、窒化物系材料から構成される。第２蛍光体３２は、励起光により励起されると赤色光を発し、例えば発光のピーク波長が６５０ｎｍである。 The second phosphor 32 is a CaAlSiN 3 -based (CaAlSiN 3 crystal structure activated by rare earth) phosphor having a composition different from that of the first phosphor 31, and is made of a nitride-based material. The second phosphor 32 emits red light when excited by excitation light, and has a peak wavelength of emission of 650 nm, for example.

図２はバックライト装置の模式断面図である。
図２に示すように、バックライト装置１００は、平板状の透明な導光板１０１と、導光板１０１を白色で発光させる前述の発光装置１と、を備えている。バックライト装置１００が用いられる液晶ディスプレイは、バックライト装置１００の白色光のうち青色光を透過するフィルタと、バックライト装置１００の白色光のうち緑色光を透過するフィルタと、バックライト装置１００の白色光のうち赤色光を透過するフィルタと、を備えている。 FIG. 2 is a schematic cross-sectional view of the backlight device.
As shown in FIG. 2, the backlight device 100 includes a flat transparent light guide plate 101 and the light emitting device 1 that causes the light guide plate 101 to emit white light. A liquid crystal display in which the backlight device 100 is used includes a filter that transmits blue light of the white light of the backlight device 100, a filter that transmits green light of the white light of the backlight device 100, and the backlight device 100. And a filter that transmits red light of white light.

発光装置１は導光板１０１の端面１０２に沿って複数並べられ、発光装置１から出射した光が導光板１０１の端面１０２に入射するようになっている。導光板１０２は、表面１０３（図２中左側の面）が発光面をなし、裏面１０４が反射面をなしている。本実施形態においては、表面１０３は、端面１０２から離れるについて裏面１０４と近接するよう傾斜して形成されている。裏面１０４には光の反射のために、反射膜を設けたり、凹部を形成しておくことが好ましい。発光装置１の第１キャビティ２１と第２キャビティ２２は、導光板１０１の厚さ方向に並べられる。そして、第１キャビティ２１が導光板１０１の発光面側に配置され、第２キャビティ２２が導光板１０１の反射面側に配置される。   A plurality of light emitting devices 1 are arranged along the end surface 102 of the light guide plate 101, and light emitted from the light emitting device 1 enters the end surface 102 of the light guide plate 101. In the light guide plate 102, the front surface 103 (the left surface in FIG. 2) is a light emitting surface, and the back surface 104 is a reflecting surface. In the present embodiment, the front surface 103 is formed so as to be inclined so as to be close to the rear surface 104 when being away from the end surface 102. In order to reflect light, the back surface 104 is preferably provided with a reflective film or a recess. The first cavity 21 and the second cavity 22 of the light emitting device 1 are arranged in the thickness direction of the light guide plate 101. The first cavity 21 is disposed on the light emitting surface side of the light guide plate 101, and the second cavity 22 is disposed on the reflective surface side of the light guide plate 101.

図３は発光装置の制御ブロック図を示す。
図３に示すように、発光装置１は、第１キャビティ２１及び第２キャビティ２２の発光状態を独立して制御するための制御部６０を有している。制御部６０は、第１ＬＥＤ素子１１及び第２ＬＥＤ素子１２へ電力を供給する電力供給部７０と、バックライトの白色光の発光状態を調整する発光調整部８０と、バックライトの白色光の色度を入力可能な色度入力部９０と、各種データ、プログラム等が記憶されている記憶部６１と、を備えている。 FIG. 3 shows a control block diagram of the light emitting device.
As shown in FIG. 3, the light emitting device 1 has a control unit 60 for independently controlling the light emitting states of the first cavity 21 and the second cavity 22. The control unit 60 includes a power supply unit 70 that supplies power to the first LED element 11 and the second LED element 12, a light emission adjustment unit 80 that adjusts the light emission state of the white light of the backlight, and the chromaticity of the white light of the backlight. A chromaticity input unit 90 capable of inputting the data, and a storage unit 61 in which various data, programs, and the like are stored.

電力供給部７０は、第１ＬＥＤ素子１１へ供給される電力を調整する第１電力調整部７１と、第２ＬＥＤ素子１２へ供給される電力を調整する第２電力調整部７２と、を有し、第１ＬＥＤ素子１１と第２ＬＥＤ素子１２へ供給される電力を独立して調整することが可能となっている。   The power supply unit 70 includes a first power adjustment unit 71 that adjusts the power supplied to the first LED element 11, and a second power adjustment unit 72 that adjusts the power supplied to the second LED element 12. The power supplied to the first LED element 11 and the second LED element 12 can be adjusted independently.

発光調整部８０は、記憶部６１に格納されている第１テーブル６２及び第２テーブル６３に基づき、設定された色度値に対して最適な電流値を算出し、電力供給部７０へ信号を送信する。第１テーブル６２は、第１ＬＥＤ素子１１の電流値と第１キャビティ２１の色度値に関し、第２テーブル６３は、第２ＬＥＤ素子１２の電流値と第２キャビティ２２の色度値に関する。尚、記憶部６１に格納されるデータは、他のデータ等であってもよく、例えば、第１ＬＥＤ素子１１と第２ＬＥＤ素子１２へ供給される電流の比と、バックライト装置１００全体として得られる白色光の色度値のデータであってもよく、第１ＬＥＤ素子１１と第２ＬＥＤ素子１２の通電に関する情報と、バックライト装置１００の白色光に関する情報とが対応づけられたものであればよい。そして、発光調整部８０は、算出された電流値に関する信号を第１電力調整部７１及び第２電力調整部７２へ送信し、第１電力調整部７１及び第２電力調整部７２が第１ＬＥＤ素子１１及び第２ＬＥＤ素子１２の光量を調整する。   The light emission adjusting unit 80 calculates an optimum current value for the set chromaticity value based on the first table 62 and the second table 63 stored in the storage unit 61, and sends a signal to the power supply unit 70. Send. The first table 62 relates to the current value of the first LED element 11 and the chromaticity value of the first cavity 21, and the second table 63 relates to the current value of the second LED element 12 and the chromaticity value of the second cavity 22. The data stored in the storage unit 61 may be other data. For example, the ratio of the current supplied to the first LED element 11 and the second LED element 12 and the entire backlight device 100 are obtained. It may be data of the chromaticity value of white light as long as the information about the energization of the first LED element 11 and the second LED element 12 and the information about the white light of the backlight device 100 are associated with each other. And the light emission adjustment part 80 transmits the signal regarding the calculated electric current value to the 1st power adjustment part 71 and the 2nd power adjustment part 72, and the 1st power adjustment part 71 and the 2nd power adjustment part 72 are 1st LED elements. 11 and the light quantity of the 2nd LED element 12 are adjusted.

本実施形態においては、発光調整部８０は、色度入力部９０に接続されている。色度入力部９０は、バックライト装置１００のユーザからの導光板１０１の色度設定の入力を受け付ける。色度入力部９０は、例えば、液晶ディスプレイの筐体に設置されたスイッチ、ボタン等であり、ユーザが液晶ディスプレイの明るさを手動で調整するときに用いられる。尚、色度入力部９０は、ユーザにより入力されるものの他、例えば、液晶ディスプレイの制御部が所定のプログラムに基づいて判断した色度設定が入力されるものであってもよい。   In the present embodiment, the light emission adjusting unit 80 is connected to the chromaticity input unit 90. The chromaticity input unit 90 receives an input of chromaticity setting of the light guide plate 101 from the user of the backlight device 100. The chromaticity input unit 90 is, for example, a switch, a button, or the like installed on the casing of the liquid crystal display, and is used when the user manually adjusts the brightness of the liquid crystal display. The chromaticity input unit 90 may be input by a user, for example, a chromaticity setting determined by a control unit of the liquid crystal display based on a predetermined program.

以上のように構成された発光装置１では、第１ＬＥＤ素子１１に通電すると、第１キャビティ２１から、第１ＬＥＤ素子１１から発せられる青色光と、第１蛍光体３１から発せられる赤色光とが取り出される。また、第２ＬＥＤ素子１２に通電すると、第２キャビティ２２から、第２ＬＥＤ素子１２から発せられる緑色光と、第２蛍光体３２から発せられる赤色光とが取り出される。そして、第１ＬＥＤ素子１１の通電量と、第２ＬＥＤ素子１２の通電量を独立して調整することにより、白色光の色度調整が可能となる。   In the light emitting device 1 configured as described above, when the first LED element 11 is energized, the blue light emitted from the first LED element 11 and the red light emitted from the first phosphor 31 are extracted from the first cavity 21. It is. Further, when the second LED element 12 is energized, green light emitted from the second LED element 12 and red light emitted from the second phosphor 32 are extracted from the second cavity 22. The chromaticity of white light can be adjusted by independently adjusting the energization amount of the first LED element 11 and the energization amount of the second LED element 12.

図４に発光装置により調整可能な色度範囲を示した色度図である。
図４に示すように、第１ＬＥＤ素子１１から発せられる光の色度値Ａと、第２ＬＥＤ素子１２から発せられる光の色度値Ｂと、第１蛍光体３１から発せられる光の色度値Ｃと、第２蛍光体３２から発せられる光の色度値Ｄと、を色度図上にプロットすることができる。本実施形態においては、色度値Ａ−Ｄにより形成される色度図上の四角形の範囲内で色度を調整することができる。 FIG. 4 is a chromaticity diagram showing a chromaticity range adjustable by the light emitting device.
As shown in FIG. 4, the chromaticity value A of light emitted from the first LED element 11, the chromaticity value B of light emitted from the second LED element 12, and the chromaticity value of light emitted from the first phosphor 31. C and the chromaticity value D of the light emitted from the second phosphor 32 can be plotted on the chromaticity diagram. In the present embodiment, the chromaticity can be adjusted within a square range on the chromaticity diagram formed by the chromaticity values AD.

本実施形態の発光装置１によれば、第１キャビティ２１と第２キャビティ２２を独立して形成し、各キャビティ２１，２２毎に１つのＬＥＤ素子１１，１２を配するようにしたので、各キャビティ２１，２２内の各蛍光体３１，３２は、１つのＬＥＤ素子１１，１２から光、熱等の影響を受ける。これにより、１つのキャビティ内に複数のＬＥＤ素子が配されるものと比べて、各キャビティ２１，２２内の各蛍光体３１，３２に均一に励起光を行き渡らせることができ、装置全体として各蛍光体３１，３２の励起効率を向上させることができる。また、各キャビティ２１，２２内の各蛍光体３１，３２へは、ＬＥＤ素子１１，１２から均一に熱が伝わるので、特定領域の蛍光体３１，３２のみ加熱されて発光特性が悪化するようなことはない。従って、青色の第１ＬＥＤ素子１１、緑色の第２ＬＥＤ素子１２、赤色の第１及び第２蛍光体３１，３２を用いる場合であっても、各蛍光体３１，３２を効率よく励起することができ、使用時の発熱による発光色の変化を抑制することができる。   According to the light emitting device 1 of the present embodiment, the first cavity 21 and the second cavity 22 are formed independently, and one LED element 11, 12 is arranged for each cavity 21, 22. The phosphors 31 and 32 in the cavities 21 and 22 are affected by light, heat, and the like from one LED element 11 and 12. As a result, the excitation light can be uniformly distributed to the phosphors 31 and 32 in the cavities 21 and 22 as compared with the case where a plurality of LED elements are arranged in one cavity. The excitation efficiency of the phosphors 31 and 32 can be improved. In addition, since heat is uniformly transmitted from the LED elements 11 and 12 to the phosphors 31 and 32 in the cavities 21 and 22, only the phosphors 31 and 32 in a specific region are heated, so that the light emission characteristics are deteriorated. There is nothing. Therefore, even when the blue first LED element 11, the green second LED element 12, and the red first and second phosphors 31 and 32 are used, the phosphors 31 and 32 can be efficiently excited. The change in emission color due to heat generation during use can be suppressed.

また、本実施形態の発光装置１によれば、第１ＬＥＤ素子１１の半導体層、第２ＬＥＤ素子１２の半導体層、第１蛍光体３１及び第２蛍光体３２は、全て窒化物系材料から構成されているので、使用時の発熱により装置が加熱されたとしても、温度による発光状態の変化がほぼ一様である。これにより、使用時に発光装置１から発せられる白色光の色合いが大きく変化するようなことはない。   Further, according to the light emitting device 1 of the present embodiment, the semiconductor layer of the first LED element 11, the semiconductor layer of the second LED element 12, the first phosphor 31 and the second phosphor 32 are all made of a nitride material. Therefore, even if the device is heated by heat generation during use, the change in the light emission state due to temperature is almost uniform. Thereby, the hue of white light emitted from the light emitting device 1 during use does not change significantly.

また、本実施形態のバックライト装置１００によれば、青色の第１ＬＥＤ素子１１が配される第１キャビティ２１を導光板１０１の反射面側とし、緑色の第２ＬＥＤ素子１２が配される第２キャビティ２２を導光板１０１の発光面側としたので、散乱し難い短波長側の光を、導光板１０１の反射面を利用して散乱させることができる。従って、導光板１０１内にて第１キャビティ２１から発せられた光と第２キャビティ２２から発せられた光を効率良く混合することができ、発光面における色むらを低減することができる。   Further, according to the backlight device 100 of the present embodiment, the first cavity 21 in which the blue first LED element 11 is arranged is the reflective surface side of the light guide plate 101, and the second LED element 12 in green is arranged in the second. Since the cavity 22 is on the light emitting surface side of the light guide plate 101, light on the short wavelength side that is difficult to scatter can be scattered using the reflection surface of the light guide plate 101. Therefore, the light emitted from the first cavity 21 and the light emitted from the second cavity 22 can be efficiently mixed in the light guide plate 101, and color unevenness on the light emitting surface can be reduced.

尚、前記実施形態においては、第１キャビティ２１と第２キャビティ２２が平面視にて長方形に形成されたものを示したが、各キャビティ２１，２２の形状は任意である。また、第１ＬＥＤ素子１１の半導体層、第２ＬＥＤ素子１２の半導体層、第１蛍光体３１及び第２蛍光体３２は、窒化物系材料に限定されず、任意に変更することができる。また、第１ＬＥＤ素子１１、第２ＬＥＤ素子１２、第１蛍光体３１及び第２蛍光体３２の発光波長も任意に変更することができる。例えば、第１蛍光体３１と第２蛍光体３２を、同一の蛍光体として製造コストの削減を図ってもよい。さらには、各キャビティ２１，２２内の第１封止材４１及び第２封止材４２につき、一方をシリコーン樹脂とし、他方をエポキシ樹脂とするなど、互いに異なる材料としてもよい。   In the above-described embodiment, the first cavity 21 and the second cavity 22 are formed in a rectangular shape in plan view, but the shapes of the cavities 21 and 22 are arbitrary. Further, the semiconductor layer of the first LED element 11, the semiconductor layer of the second LED element 12, the first phosphor 31 and the second phosphor 32 are not limited to nitride materials, and can be arbitrarily changed. Further, the emission wavelengths of the first LED element 11, the second LED element 12, the first phosphor 31 and the second phosphor 32 can be arbitrarily changed. For example, the manufacturing cost may be reduced by using the first phosphor 31 and the second phosphor 32 as the same phosphor. Furthermore, the first sealing material 41 and the second sealing material 42 in each of the cavities 21 and 22 may be made of different materials such that one is a silicone resin and the other is an epoxy resin.

また、前記実施形態においては、電力供給部７０が第１ＬＥＤ素子１１と第２ＬＥＤ素子１２を独立して制御するものを示したが、電力供給部７０が第１ＬＥＤ素子１１と第２ＬＥＤ素子１２に同様に電力を供給する構成としてもよい。   In the embodiment, the power supply unit 70 controls the first LED element 11 and the second LED element 12 independently. However, the power supply unit 70 is similar to the first LED element 11 and the second LED element 12. It is good also as a structure which supplies electric power to.

また、前記実施形態においては、導光板１０１の表面１０３が傾斜して形成されたものを示したが、例えば図５に示すように、表面１０３と裏面１０４とが平行に形成されたバックライト装置１００であってもよい。   In the embodiment, the surface 103 of the light guide plate 101 is formed to be inclined. However, as shown in FIG. 5, for example, a backlight device in which the surface 103 and the back surface 104 are formed in parallel. 100 may be sufficient.

以上、本発明の代表的と思われる実施形態について説明したが、本発明は必ずしも前記実施形態の構造のみに限定されるものではなく、具体的な細部構造等について適宜に変更可能であることは勿論である。   As mentioned above, although the embodiment considered to be representative of the present invention has been described, the present invention is not necessarily limited to the structure of the embodiment described above, and it is possible to appropriately change the specific detailed structure and the like. Of course.

１ 発光装置
１１ 第１ＬＥＤ素子
１２ 第２ＬＥＤ素子
２０ ケース
２１ 第１キャビティ
２２ 第２キャビティ
３１ 第１蛍光体
３２ 第２蛍光体
４１ 第１封止材
４２ 第２封止材
５１ 第１リード
５２ 第２リード
５３ 第３リード
５４ 第４リード
５５ ワイヤ
６０ 制御部
６１ 記憶部
６２ 第１テーブル
６３ 第２テーブル
７０ 電力供給部
７１ 第１電力調整部
７２ 第２電力調整部
８０ 発光調整部
９０ 色度入力部
１００ バックライト装置
１０１ 導光板
１０２ 端面
１０３ 表面
１０４ 裏面 DESCRIPTION OF SYMBOLS 1 Light-emitting device 11 1st LED element 12 2nd LED element 20 Case 21 1st cavity 22 2nd cavity 31 1st fluorescent substance 32 2nd fluorescent substance 41 1st sealing material 42 2nd sealing material 51 1st lead 52 2nd Lead 53 Third lead 54 Fourth lead 55 Wire 60 Control unit 61 Storage unit 62 First table 63 Second table 70 Power supply unit 71 First power adjustment unit 72 Second power adjustment unit 80 Light emission adjustment unit 90 Chromaticity input unit DESCRIPTION OF SYMBOLS 100 Backlight apparatus 101 Light-guide plate 102 End surface 103 Front surface 104 Back surface

Claims (5)

青色光を発する第１ＬＥＤ素子と、前記青色光により励起されると赤色光を発する第１蛍光体と、が配された第１キャビティと、
緑色光を発する第２ＬＥＤ素子と、前記青緑色光又は緑色光により励起されると赤色光を発する第２蛍光体と、が配され、前記第１キャビティと独立して形成される第２キャビティと、を備えた発光装置。 A first cavity in which a first LED element that emits blue light and a first phosphor that emits red light when excited by the blue light are disposed;
A second LED element that emits green light, and a second phosphor that emits red light when excited by the blue-green light or green light, and is formed independently of the first cavity; And a light emitting device. 前記第１ＬＥＤ素子の半導体層、前記第２ＬＥＤ素子の半導体層、前記第１蛍光体及び前記第２蛍光体は、全て窒化物系材料から構成される請求項１に記載の発光装置。   2. The light emitting device according to claim 1, wherein the semiconductor layer of the first LED element, the semiconductor layer of the second LED element, the first phosphor, and the second phosphor are all made of a nitride-based material. 前記第１ＬＥＤ素子と、前記第２ＬＥＤ素子は、互いに独立して駆動される請求項２に記載の発光装置。   The light emitting device according to claim 2, wherein the first LED element and the second LED element are driven independently of each other. 請求項２または３に記載の発光装置と、
前記発光装置から発せられる光が端面から入射する導光板と、を備えたバックライト装置。 A light emitting device according to claim 2 or 3,
And a light guide plate on which light emitted from the light emitting device is incident from an end face. 前記発光装置の前記第１キャビティと前記第２キャビティは、前記導光板の厚さ方向に並べられ、
前記導光板は、表面が発光面をなし、裏面が反射面をなし、
前記第１キャビティが前記導光板の発光面側に配置され、
前記第２キャビティが前記導光板の反射面側に配置される請求項４に記載のバックライト装置。 The first cavity and the second cavity of the light emitting device are arranged in the thickness direction of the light guide plate,
The light guide plate has a light emitting surface on the front surface and a reflective surface on the back surface,
The first cavity is disposed on a light emitting surface side of the light guide plate;
The backlight device according to claim 4, wherein the second cavity is disposed on a reflective surface side of the light guide plate.
JP2009080096A 2009-03-27 2009-03-27 Light emitting device, and backlight device Pending JP2010232529A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009080096A JP2010232529A (en) 2009-03-27 2009-03-27 Light emitting device, and backlight device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009080096A JP2010232529A (en) 2009-03-27 2009-03-27 Light emitting device, and backlight device

Publications (1)

Publication Number Publication Date
JP2010232529A true JP2010232529A (en) 2010-10-14

Family

ID=43048056

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009080096A Pending JP2010232529A (en) 2009-03-27 2009-03-27 Light emitting device, and backlight device

Country Status (1)

Country Link
JP (1) JP2010232529A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8664846B2 (en) 2011-04-11 2014-03-04 Cree, Inc. Solid state lighting device including green shifted red component
WO2014175141A1 (en) * 2013-04-26 2014-10-30 シャープ株式会社 Method for manufacturing light-emitting device, method for manufacturing illumination device, and lead frame assembly
US8999737B2 (en) 2013-08-27 2015-04-07 Glo Ab Method of making molded LED package
WO2015099115A1 (en) * 2013-12-27 2015-07-02 三菱化学株式会社 Light-emitting device and method for designing light emitting device
JP2015144231A (en) * 2013-12-27 2015-08-06 三菱化学株式会社 Light-emitting device and method for designing light emitting device
US9142745B2 (en) 2013-08-27 2015-09-22 Glo Ab Packaged LED device with castellations
US9257616B2 (en) 2013-08-27 2016-02-09 Glo Ab Molded LED package and method of making same
JP2016054184A (en) * 2014-09-03 2016-04-14 シチズン電子株式会社 Light-emitting device, and manufacturing method of light-emitting device
JP2016054044A (en) * 2014-09-03 2016-04-14 シチズン電子株式会社 Light emitting device including semiconductor light emitting element, light emitting device design method, light emitting device driving method and lighting method
US9722150B2 (en) 2011-09-02 2017-08-01 Citizen Electronics Co., Ltd. Illumination method and light-emitting device
US9755118B2 (en) 2013-03-04 2017-09-05 Citizen Electronics Co., Ltd. Light-emitting device, method for designing light-emitting device, method for driving light-emitting device, illumination method, and method for manufacturing light-emitting device
US9818914B2 (en) 2011-09-02 2017-11-14 Citizen Electronics Co., Ltd. Illumination method and light-emitting device
CN107863336A (en) * 2016-09-21 2018-03-30 首尔半导体株式会社 Light emission diode package member and light-emitting diode (LED) module
US11450789B2 (en) 2013-12-27 2022-09-20 Citizen Electronics Co., Ltd. Illumination method using a light-emitting device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005183124A (en) * 2003-12-18 2005-07-07 Matsushita Electric Ind Co Ltd Planar light source and liquid crystal display device
JP2006073656A (en) * 2004-08-31 2006-03-16 Nichia Chem Ind Ltd Light emitting device
JP2008010291A (en) * 2006-06-29 2008-01-17 Citizen Electronics Co Ltd Light guide plate, back light unit, and display device equipped with its back light unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005183124A (en) * 2003-12-18 2005-07-07 Matsushita Electric Ind Co Ltd Planar light source and liquid crystal display device
JP2006073656A (en) * 2004-08-31 2006-03-16 Nichia Chem Ind Ltd Light emitting device
JP2008010291A (en) * 2006-06-29 2008-01-17 Citizen Electronics Co Ltd Light guide plate, back light unit, and display device equipped with its back light unit

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8664846B2 (en) 2011-04-11 2014-03-04 Cree, Inc. Solid state lighting device including green shifted red component
US9722150B2 (en) 2011-09-02 2017-08-01 Citizen Electronics Co., Ltd. Illumination method and light-emitting device
US10355177B2 (en) 2011-09-02 2019-07-16 Citizen Electronics Co., Ltd. Illumination method and light-emitting device
US10236424B2 (en) 2011-09-02 2019-03-19 Citizen Electronics Co., Ltd. Illumination method and light-emitting device
US20180198036A1 (en) 2011-09-02 2018-07-12 Citizen Electronics Co., Ltd. Illumination method and light-emitting device
US9997677B2 (en) 2011-09-02 2018-06-12 Citizen Electronics Co., Ltd. Illumination method and light-emitting device
US9954149B2 (en) 2011-09-02 2018-04-24 Citizen Electronics Co., Ltd. Illumination method and light-emitting device
US9818914B2 (en) 2011-09-02 2017-11-14 Citizen Electronics Co., Ltd. Illumination method and light-emitting device
US9997678B2 (en) 2013-03-04 2018-06-12 Citizen Electronics Co. Ltd. Light-emitting device, method for designing light-emitting device, method for driving light-emitting device, illumination method, and method for manufacturing light-emitting device
US9755118B2 (en) 2013-03-04 2017-09-05 Citizen Electronics Co., Ltd. Light-emitting device, method for designing light-emitting device, method for driving light-emitting device, illumination method, and method for manufacturing light-emitting device
US10930823B2 (en) 2013-03-04 2021-02-23 Citizen Electronics Co., Ltd. Light-emitting device, method for designing light-emitting device, method for driving light-emitting device, illumination method, and method for manufacturing light-emitting device
WO2014175141A1 (en) * 2013-04-26 2014-10-30 シャープ株式会社 Method for manufacturing light-emitting device, method for manufacturing illumination device, and lead frame assembly
US8999737B2 (en) 2013-08-27 2015-04-07 Glo Ab Method of making molded LED package
US9257616B2 (en) 2013-08-27 2016-02-09 Glo Ab Molded LED package and method of making same
US9142745B2 (en) 2013-08-27 2015-09-22 Glo Ab Packaged LED device with castellations
JP2015144231A (en) * 2013-12-27 2015-08-06 三菱化学株式会社 Light-emitting device and method for designing light emitting device
WO2015099115A1 (en) * 2013-12-27 2015-07-02 三菱化学株式会社 Light-emitting device and method for designing light emitting device
US11450789B2 (en) 2013-12-27 2022-09-20 Citizen Electronics Co., Ltd. Illumination method using a light-emitting device
JP2016054044A (en) * 2014-09-03 2016-04-14 シチズン電子株式会社 Light emitting device including semiconductor light emitting element, light emitting device design method, light emitting device driving method and lighting method
JP2016054184A (en) * 2014-09-03 2016-04-14 シチズン電子株式会社 Light-emitting device, and manufacturing method of light-emitting device
CN107863336A (en) * 2016-09-21 2018-03-30 首尔半导体株式会社 Light emission diode package member and light-emitting diode (LED) module
CN107863336B (en) * 2016-09-21 2023-11-03 首尔半导体株式会社 Light emitting diode package and light emitting diode module

Similar Documents

Publication Publication Date Title
JP2010232529A (en) Light emitting device, and backlight device
KR100705053B1 (en) A light emitting diode device comprising a luminescent substrate that performs phosphor conversion
US8575640B2 (en) Polarized white light emitting diode
WO2009144922A1 (en) White light led, and backlight and liquid crystal display device using the same
WO2011132716A1 (en) Semiconductor light emitting device and production method for semiconductor light emitting device
JP6262335B2 (en) LED drive circuit
JP2010225842A (en) Light source for back light of liquid crystal display, back light of liquid crystal display, and liquid crystal display
TW201022802A (en) White point compensated LEDs for LCD displays
JP2011091441A (en) Red-deficiency compensating phosphor led
JP2011159832A (en) Semiconductor light emitting device
JP2006309209A (en) Image display device
JP5443959B2 (en) Lighting device
WO2011129429A1 (en) Led light-emitting device
KR20110055744A (en) Led with controlled angular non-uniformity
US8405111B2 (en) Semiconductor light-emitting device with sealing material including a phosphor
JP2007250986A (en) Led backlight apparatus
US20130258638A1 (en) Wavelength-converting structure for a light source
US11953194B2 (en) High quality white laser-based light source by indirect pumping of red phosphor
JP2011108672A (en) White light emitting apparatus and lighting fitting for vehicle using the same
JP2006269448A (en) Led
US8022631B2 (en) Color control of light sources employing phosphors
KR20050089490A (en) White color light emitting diode using violet light emitting diode
KR20120084786A (en) Light emitting device
JP2011159769A (en) Semiconductor light emitting device
KR20120050720A (en) An enhanced led backlight unit and a display using the same

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20110422

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120801

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120918

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20121116

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20130611

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20130806

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20140304