JP2008010691A - 照明装置および照明装置を用いた表示装置 - Google Patents
照明装置および照明装置を用いた表示装置 Download PDFInfo
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- JP2008010691A JP2008010691A JP2006180628A JP2006180628A JP2008010691A JP 2008010691 A JP2008010691 A JP 2008010691A JP 2006180628 A JP2006180628 A JP 2006180628A JP 2006180628 A JP2006180628 A JP 2006180628A JP 2008010691 A JP2008010691 A JP 2008010691A
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 9
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- 230000003287 optical effect Effects 0.000 claims description 8
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
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- 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
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- H01L2224/48465—Connecting portions the connecting portion on the bonding area of the semiconductor or solid-state body being a ball bond the other connecting portion not on the bonding area being a wedge bond, i.e. ball-to-wedge, regular stitch
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Abstract
【解決手段】一連のリードフレーム2に複数個の発光ダイオード4が直列に配置され、かつ前記一連のリードフレーム2複数本が並列に配置されかつ反射樹脂31と透明樹脂32により封止されて基板上に配置されている照明装置において、前記リードフレーム2と基板1間に間隙を有する。またこの照明装置を画像表示装置のバックライトに用いる。
【選択図】図2
Description
2Gのみまたは2Rと2Bが間隙を有していれば、すべてが間隙を有している場合より効果は劣るが、信頼性を高める効果がある。また、本発明では基板1とリードフレーム2間の間隙を利用して、リードフレームの下に他の配線や光センサ,熱センサを配置できる。また基板1を外枠や筐体に固定するためのネジなどの構造物も間隙を利用して配置することも可能であり、これらの構造物を避けてリードフレームを引き回す必要が無く、設計の自由度を上げる効果もある。
32は反射樹脂31の内部にディスペンスやポッティング等の方法で配置され、熱硬化,UV硬化やその他硬化方法により硬化される。透明樹脂32の量や形状は照明装置の設計方針や樹脂粘度,チクソ性等各種の性質により任意に設定することができる。また更に屈折率の高い微粒子を、透明樹脂32に混入し屈折率を高め、発光ダイオード4からの光取り出し効率を向上させることや、拡散性を付与し均一性を向上させることも可能である。
14(b)に示すように低くなっている反射樹脂31の凹凸部に反射シート6を簡易的に合わせ配置できる利点がある。
4Bが搭載されるものである。本発明の照明装置では赤,青,緑の光の混色で白色光を再現することが可能であり一般に、緑に発光する発光ダイオードの効率が、赤,青に発光する発光ダイオードの効率よりも低いため、赤,緑,緑,青を一組として実装することで各色を効率良く混色し白色を再現することができる。また、本実施例では同色の発光ダイオードが搭載されているリードフレーム2G1とリードフレーム2G2とが隣り合う配置となっている。これら2本のリードフレームにはほぼ同電圧を印加し駆動することから、リードフレーム2G1,2G2間には電位差もほとんど無くマイグレーションなどによるショートの発生を抑えることができ信頼性を高めることができる。本実施例ではリードフレームが4本の例を示したが、リードフレームの数がそれ以上に増えた場合でも、電位差が少なくなるように同色の発光ダイオードを搭載したリードフレーム同士を隣接させることで同様の効果が得られる。
Claims (19)
- 基板と、
前記基板上に配置した複数本のリードフレームと、
前記複数本のリードフレームのそれぞれに直列接続された複数個の発光ダイオードと、
前記リードフレーム上に配置し、かつ前記発光ダイオードを封止した透明樹脂と、を有し、
前記リードフレームと前記基板との間に空隙が形成された
照明装置。 - 前記リードフレームに、前記発光ダイオードを囲むように反射樹脂を配置し、前記反射樹脂上に前記透明樹脂を設けたことにより前記発光ダイオードが封止された請求項1に記載の照明装置。
- 前記リードフレームの一部は前記基板と接触しないよう折り曲げた構造を有する請求項2に記載の照明装置。
- 前記折り曲げた構造とは、前記基板に対し垂直方向に前記リードフレームが立ち上がるよう折り曲げた構造である請求項3に記載の照明装置。
- 前記リードフレームと、前記反射樹脂又は前記透明樹脂とが接触する領域において、前記リードフレームの折り曲げ部が形成されている請求項3に記載の照明装置。
- 前記基板は前記リードフレームを配置した側の面に凹凸形状を有し、
前記凹凸形状の凹部において、前記リードフレームと前記基板との間に空隙が形成された請求項2に記載の照明装置。 - 前記リードフレームと前記発光ダイオードとの間に銀メッキを配置した請求項2に記載の照明装置。
- 前記基板の前記リードフレームを配置した側の面に接着層を設けた請求項2に記載の照明装置。
- 前記複数本のリードフレームのうち、少なくとも隣接するリードフレームは、お互いに前記反射樹脂又は前記透明樹脂に接触する領域が異なる請求項2に記載の照明装置。
- 前記複数本のリードフレームのうち、少なくとも隣接するリードフレームは、お互いに前記反射樹脂又は前記透明樹脂から露出する位置が異なる請求項2に記載の照明装置。
- 前記反射樹脂又は前記透明樹脂は、前記基板面内の前記リードフレームが露出する位置において凹形状又は凸形状を有する請求項10に記載の照明装置。
- 前記発光ダイオードは赤色の波長領域で発光するもの、緑色の波長領域で発光するもの、青色の波長領域で発光するもの、を有し、
前記赤色,緑色,青色のうち同色の波長領域で発光する発光ダイオードが前記リードフレームで直列接続された請求項2に記載の照明装置。 - 前記複数本のリードフレームは、
前記赤色の波長領域で発光する発光ダイオードを直列接続したリードフレーム,前記緑色の波長領域で発光する発光ダイオードを直列接続したリードフレーム,前記青色の波長領域で発光する発光ダイオードを直列接続したリードフレーム、の割合が1:2:1である請求項11に記載の照明装置。 - 前記緑色の波長領域で発光する発光ダイオードを直列接続したリードフレーム2本が、隣り合うように配置した請求項12に記載の照明装置。
- 前記発光ダイオードは青色の波長領域又は紫色の波長領域で発光し、
前記波長領域の光で励起し発光する蛍光体を、前記反射樹脂に配置した請求項2に記載の照明装置。 - 基板と、
前記基板上に配置した複数本のリードフレームと、
前記複数本のリードフレームのそれぞれに直列接続された複数個の発光ダイオードと、
前記リードフレーム上に配置し、かつ前記発光ダイオードを封止した透明樹脂と、を有する照明装置を1以上有するバックライトと、
前記バックライトからの光を供給する液晶表示パネルと、
前記バックライトと前記液晶表示パネルとの間に位置し、前記バックライトからの光の均一性及び指向性を制御する光学部材群と、を有し、
前記リードフレームと前記基板との間に空隙が形成された
液晶表示装置。 - 前記リードフレームに、前記発光ダイオードを囲むように反射樹脂を配置し、前記反射樹脂上に前記透明樹脂を設けたことにより前記発光ダイオードが封止された請求項16に記載の液晶表示装置。
- 前記バックライトは、前記液晶表示パネル面に対し側面に前記照明装置を配置し、前記側面に配置した照明装置からの光を前記液晶表示パネル面へと導く導光体を有する請求項17に記載の液晶表示装置。
- 前記バックライトは、前記照明装置及び前記照明装置からの光を前記液晶表示パネル面へと導く導光体を複数組有し、前記複数組の照明装置及び導光体をタイル状に並べて構成した請求項16に記載の液晶表示装置。
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