JP6866903B2 - 発光モジュール - Google Patents
発光モジュール Download PDFInfo
- Publication number
- JP6866903B2 JP6866903B2 JP2019084913A JP2019084913A JP6866903B2 JP 6866903 B2 JP6866903 B2 JP 6866903B2 JP 2019084913 A JP2019084913 A JP 2019084913A JP 2019084913 A JP2019084913 A JP 2019084913A JP 6866903 B2 JP6866903 B2 JP 6866903B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light emitting
- guide plate
- light guide
- emitting element
- 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.)
- Active
Links
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Images
Classifications
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133612—Electrical details
Description
図1は、本開示のある実施形態による面発光光源の例示的な構成を示す。図1に示す面発光光源200は、上面210aを有する導光板210と、導光板210の下方に位置する層状の光反射部材240とを含む。なお、図1には、説明の便宜のために、互いに直交するX方向、Y方向およびZ方向を示す矢印があわせて図示されている。本開示の他の図面においてもこれらの方向を示す矢印を図示することがある。
導光板110Aは、発光素子120からの光を拡散させて上面110aから出射させる機能を有する。本実施形態において、複数の導光板110Aの上面110aの集合は、面発光光源200の発光面を構成する。
再び図3を参照する。上述したように、反射性樹脂層130は、第1穴部10Aの第1部分11Aに位置する。第1部分11Aの全体が反射性樹脂層130で充填されていることは、本開示の実施形態において必須ではない。反射性樹脂層130は、第1部分11Aの一部を占めていればよい。例えば、第1部分11Aの第1側面11cを覆うように反射性樹脂層130を第1穴部10A内に形成してもよい。
発光素子120の典型例は、LEDである。図3に例示する構成おいて、発光素子120は、素子本体122と、発光素子120の上面120aとは反対側に位置する電極124とを有する。素子本体122は、例えば、サファイアまたは窒化ガリウム等の支持基板と、支持基板上の半導体積層構造とを含む。半導体積層構造は、n型半導体層およびp型半導体層と、これらに挟まれた活性層とを含む。半導体積層構造は、紫外〜可視域の発光が可能な窒化物半導体(InxAlyGa1-x-yN、0≦x、0≦y、x+y≦1)を含んでいてもよい。この例では、発光素子120の上面120aは、素子本体122の上面に一致している。電極124は、正極および負極の組を含み、半導体積層構造に所定の電流を供給する機能を有する。
図3に例示する構成において、波長変換部材150は、第2穴部20の内部であって導光板110Aと発光素子120との間に配置されている。換言すれば、波長変換部材150は、発光素子120の上方であって第2穴部20の底部に位置する。ここで、「第2穴部20の底部」とは、導光板110Aの下面110bを上に向けたときの第2穴部20の底に相当する部分を意味する。このように、本明細書では、発光モジュールについて図面に表された姿勢に拘泥することなく、「底部」および「底面」の用語を使用することがある。第2穴部20の底部は、発光モジュール100Aを図3に示す姿勢としたとき、導光板110Aの下面110b側に形成されるドーム状の構造の天井部分であるともいえる。
接合部材160は、発光素子120の側面の少なくとも一部を覆う透光性の部材である。図3に模式的に示すように、典型的には、接合部材160は、発光素子120の上面120aと波長変換部材150との間に位置する層状の部分を有する。
光反射部材170は、波長変換部材150の下面側(導光板110Aとは反対側)に位置する光反射性を有する部材である。図3に示すように、光反射部材170は、接合部材160の外面、発光素子120の側面のうち接合部材160に覆われていない部分、および、発光素子120の、上面120aとは反対側に位置する下面のうち電極124を除く領域を覆う。光反射部材170は、電極124の側面を覆い、他方、電極124の下面は、光反射部材170の下面から露出される。
上述したように、発光体100Uは、第2の接合部材190により第2穴部20の底部に配置される。図3に示すように、第2の接合部材190の少なくとも一部は、第2穴部20の内部に位置する。第2の接合部材190は、第2穴部20の底部と波長変換部材150との間に位置する部分を有していてもよい。図3に示すように、第2の接合部材190は、導光板110Aの下面110bよりも導光板110Aの上面110aとは反対側に盛り上がった部分を有し得る。
光反射部材140は、光反射性を有し、導光板110Aの下面110bの少なくとも一部を覆う。ここでは、光反射部材140は、導光板110Aの下面110bに加えて第2の接合部材190をも覆っている。この例のように第2の接合部材190を光反射部材140で覆うことにより、第2の接合部材190からの導光板110Aの下面110b側への光の漏れを抑制して光の取出し効率を向上させ得る。
図3に例示する構成において、発光モジュール100Aは、光反射部材140の下面140b上に位置する配線層180をさらに有する。配線層180は、発光素子120の電極124に電気的に接続された配線を含む。この例では、配線層180は、光反射部材170上に位置するように描かれているが、配線層180は、光反射部材140の下面140b上に位置する部分を含みえる。
実施例のサンプルとして、それぞれが、図11に示す発光モジュール100Bと同様の構成を有する複数の発光モジュールの4行4列の配列を含む面発光光源を作製した。ここでは、酸化チタンの粒子が含有されたシリコーン樹脂で第1穴部10Bの第1部分11Bの全体を充填した。
各発光モジュールの第1穴部の形状を側面が単一の傾斜を有する円錐状とし、酸化チタンの粒子が含有されたシリコーン樹脂で第1穴部の全体を充填した面発光光源を比較例のサンプルとして作製した。
10a 第1穴部の開口
11A、11B 第1穴部の第1部分
11b 第1部分の底面
11c 第1穴部の第1側面
12A 第1穴部の第2部分
12a 第2部分の開口
12c 第2部分の第2側面
20 第2穴部
100、100A〜100H 発光モジュール
100K、100N、100P 発光モジュール
100U、100T 発光体
110A〜110E 導光板
110K 導光板
110a 導光板の上面
110b 導光板の下面
110d、110e (複数の)凸部
110f、110g (複数の)凹部
111A、111B、111F 第1領域
111Ba 第1領域の外側領域
111Bb 第1領域の内側領域
112B、112D、112F 第2領域
120 発光素子
124 発光素子の電極
130 反射性樹脂層
140、170 光反射部材
140s 傾斜面
150、150A 波長変換部材
160、190 接合部材
180 配線層
200 面発光光源
210 導光板
240 光反射部材
250 ドライバ
260 配線基板
320 透光性部材
350 波長変換シート
300、400 面発光光源
Claims (12)
- 第1穴部が設けられた上面および前記上面とは反対側の下面を有する導光板と、
前記第1穴部に対向して前記導光板の下面側に配置された発光素子と、
反射性樹脂層と
を備え、
前記第1穴部は、第1部分および第2部分を含み、
前記第1部分は、前記上面に対して傾斜している第1側面を有し、
前記第2部分は、前記上面に対して傾斜している第2側面であって、前記上面に位置する開口と前記第1部分の前記第1側面との間に位置する第2側面を有し、
前記反射性樹脂層は、前記第1穴部の前記第1部分に位置しており、
前記上面に対する前記第1側面の傾斜は、前記上面に対する前記第2側面の傾斜よりも緩い、発光モジュール。 - 前記第1穴部の前記第2部分の内部の屈折率は、前記反射性樹脂層の屈折率よりも低い、請求項1に記載の発光モジュール。
- 前記第1穴部の前記第1部分は、前記第1側面に接続する底面をさらに有する、請求項1または2に記載の発光モジュール。
- 前記上面に垂直な断面における前記第2側面の形状は、曲線状である、請求項1から3のいずれかに記載の発光モジュール。
- 前記導光板の前記下面は、前記第1穴部に対向する位置に第2穴部を有し、
前記発光素子は、平面視において前記第2穴部の内側に位置する、請求項1から4のいずれかに記載の発光モジュール。 - 前記第2穴部の内部であって前記発光素子と前記導光板との間に位置する波長変換部材をさらに備える、請求項5に記載の発光モジュール。
- 前記発光素子は、平面視において前記第1穴部の内側に位置し、
前記発光素子と前記導光板との間に位置する波長変換部材をさらに備える、請求項1から4のいずれかに記載の発光モジュール。 - 前記導光板の前記上面上または上方に位置する波長変換シートをさらに備える、請求項1から4のいずれかに記載の発光モジュール。
- 前記発光素子は、前記導光板とは反対側に電極を有し、
前記発光モジュールは、前記導光板の前記下面の少なくとも一部を覆う光反射部材をさらに備える、請求項1から8のいずれかに記載の発光モジュール。 - 前記光反射部材の下面側に位置し、前記電極に電気的に接続された配線層をさらに備える、請求項9に記載の発光モジュール。
- 前記光反射部材は、前記下面側から前記上面側に向かって突出する壁部であって、前記発光素子を取り囲む傾斜面を含む壁部を有する、請求項9または10に記載の発光モジュール。
- 請求項1から11のいずれかに記載の発光モジュールを複数備える面発光光源であって、
前記複数の発光モジュールは、二次元に配列されている、面発光光源。
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