JP7602716B2 - 光抽出効率を向上させたナノ構造ベースの表示装置 - Google Patents
光抽出効率を向上させたナノ構造ベースの表示装置 Download PDFInfo
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- JP7602716B2 JP7602716B2 JP2021564702A JP2021564702A JP7602716B2 JP 7602716 B2 JP7602716 B2 JP 7602716B2 JP 2021564702 A JP2021564702 A JP 2021564702A JP 2021564702 A JP2021564702 A JP 2021564702A JP 7602716 B2 JP7602716 B2 JP 7602716B2
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Images
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- 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
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- G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
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- G—PHYSICS
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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
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- G—PHYSICS
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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
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- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
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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
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- G—PHYSICS
- G02—OPTICS
- 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
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- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/133528—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F2202/00—Materials and properties
- G02F2202/36—Micro- or nanomaterials
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- Optical Elements Other Than Lenses (AREA)
Description
分野
[0001] 本発明は、量子ドット(QD)などの発光性ナノ構造を有する色変換層を含む表示装置に関する。
[0002] 量子ドット(QD)などの発光性ナノ構造(NS)は、狭い線幅を有する単一スペクトルピークで光を放出し、高度に飽和した色を生み出す能力を有する一種の蛍光体を表す。NSのサイズに基づいて発光波長を調整することが可能である。NSは、表示装置(例えば、液晶表示(LCD)装置、有機発光ダイオード(OLED)表示装置)において色変換(CC)層(色ダウンコンバージョン層とも呼ばれる)として使用できるNSフィルムを作製するために使用される。発光ディスプレイにおけるNSベースのCC層の使用は、光が色フィルタを通過する前に、白色光、青色光、又は紫外(UV)光を、赤色及び/又は緑色波長領域の光にダウンコンバートすることにより、システム効率を向上させることができる。NSベースのCC層の使用により、フィルタリングに起因する光エネルギーの損失を低減することができる。
[0004] 本開示は、NSベースのCC層からの向上した光抽出のための光抽出層を備えた例示的な高効率のNSベースの表示装置を提供する。本開示はまた、上記の高効率のNSベースの表示装置を製造するための例示的な安価な方法も提供する。
[0010] 本明細書に組み込まれ且つ本明細書の一部を形成する、添付の図面は、本実施形態を図示し、更に、本説明と共に、本実施形態の原理を説明する役割と、関連技術分野の当業者が本実施形態を作製及び使用できるようにする役割とを果たす。
[0016] 具体的な構成及び配置が検討され得るが、これは、単に例示の目的で行われることを理解すべきである。関連技術分野の当業者であれば、本発明の趣旨及び範囲から逸脱することなく、他の構成及び配置を使用できることを認識するであろう。本発明を本明細書で具体的に述べたもの以外の他の様々な用途にも用いることができることが、関連技術分野の当業者には明らかになるであろう。本明細書に示し説明する特定の実施態様は、例であり、本出願の範囲を限定するようには決して意図されていないことを認識すべきである。
[0046] 図1は、いくつかの実施形態による、光抽出層140を備えたLCD表示装置100の概略分解断面図を図示している。図1の表示装置の図は、説明の目的で示されおり、原寸に比例してない場合がある。LCD表示装置100は、いくつかの実施形態によれば、バックライトユニット(BLU)102とLCDモジュール104とを含むことができる。
[0082] 図3は、いくつかの実施形態による、表示装置100及び/又は200を製造するための例示的な方法300のフロー図である。ステップは、具体的な用途に応じて異なる順序で実施することも実施しないこともできる。方法300では完全な表示装置が作製されないことがあることに留意すべきである。よって、追加のプロセスを方法300の前、最中、及び後に提供できることと、いくつかの他のプロセスは本明細書では簡潔にのみ説明され得ることを理解されたい。
[0089] 図4は、いくつかの実施形態による、バリア層で被覆された発光性ナノ構造(NS)400の断面構造を図示している。いくつかの実施形態では、NS400の集団は、NSベースのCC層136内に含めることができる。バリア層で被覆されたNS400は、NS401とバリア層406とを含む。NS401は、コア402とシェル404とを含む。コア402は、より高いエネルギーの吸収時に光を放出する半導体材料を含む。コア402用の半導体材料の例としては、リン化インジウム(InP)、セレン化カドミウム(CdSe)、硫化亜鉛(ZnS)、硫化鉛(PbS)、ヒ化インジウム(InAs)、リン化インジウムガリウム、(InGaP)、セレン化カドミウム亜鉛(CdZnSe)、セレン化亜鉛(ZnSe)、及びテルル化カドミウム(CdTe)が挙げられる。直接バンドギャップを示す他の任意のII-VI族、III-V族、第3級、又は第4級の半導体構造も同様に使用することができる。いくつかの実施形態では、コア402はまた、いくつかの例を提供するために、金属、合金などの1つ又は複数のドーパントを含むことができる。金属ドーパントの例としては、限定されるものではないが、亜鉛(Zn)、銅(Cu)、アルミニウム(Al)、白金(Pt)、クロム(Cr)、タングステン(W)、パラジウム(Pd)、又はこれらの組み合わせを挙げることができる。コア402内の1つ又は複数のドーパントの存在により、ドープされていないNSと比較して、NS401の構造的及び光学的安定性並びにQYを向上させることができる。
[0102] 図5は、いくつかの実施形態による、NSフィルム500の断面図を図示している。いくつかの実施形態では、NSベースのCC層136は、NSフィルム500と同様であり得る。
[0111] 本明細書では、発光性ナノ構造(NS)を有する種々の組成物について説明する。吸収特性、発光特性、及び屈折率特性を含む、発光性ナノ構造の種々の特性は、種々の用途に合わせて調整及び調節することができる。
Claims (28)
- 表示装置であって、
光源を含むバックライトユニットと、
第1のピーク波長を有する一次光を前記光源から受け取り、前記一次光の一部を変換して、前記第1のピーク波長と異なる第2のピーク波長を有する二次光を放出するように構成されたナノ構造ベースの色変換(NSベースのCC)層と、
前記NSベースのCC層に光学的に結合された光抽出層であって、ナノメートルスケールの1つ又は複数の寸法を有するパターン形成された特徴部を有する、前記光抽出層と、
を含み、
前記光抽出層は、光学的に透明な基板を含み、かつ、前記二次光の全内部反射を低減するように構成されており、
前記パターン形成された特徴部は、前記光学的に透明な基板上に繰り返しパターン又はランダムパターンで配設され、
前記光学的に透明な基板は、前記NSベースのCC層と前記パターン形成された特徴部との間に配置され、
前記パターン形成された特徴部の上面は、前記NSベースのCC層の上面から離れる方向に向いている、
表示装置。 - 前記パターン形成された特徴部及び前記NSベースのCC層のマトリックスは、同じ材料を含む、請求項1に記載の表示装置。
- 前記パターン形成された特徴部の材料及び前記NSベースのCC層のマトリックス材料は、屈折率が互いに等しい、請求項1又は2に記載の表示装置。
- 前記パターン形成された特徴部は、約10nm~約100nmの範囲の横寸法を有する、請求項1~3のいずれか一項に記載の表示装置。
- 前記パターン形成された特徴部は、約10nm~約100nmの範囲の縦寸法を有する、請求項1~4のいずれか一項に記載の表示装置。
- 前記パターン形成された特徴部は、前記NSベースのCC層に接触する、請求項1~5のいずれか一項に記載の表示装置。
- 前記光抽出層と前記NSベースのCC層との間に配置されたフィルタ要素を更に含む、請求項1~6のいずれか一項に記載の表示装置。
- 前記フィルタ要素は、前記NSベースのCC層と前記光抽出層とに光学的に結合され、前記二次光が前記フィルタ要素を通過することを可能にし且つ前記一次光の変換されていない部分が前記フィルタ要素を通過するのを阻止するように構成されている、請求項7に記載の表示装置。
- 前記フィルタ要素は、前記一次光の前記変換されていない部分を吸収するように構成される、請求項8に記載の表示装置。
- 前記フィルタ要素は、前記一次光の前記変換されていない部分を散乱させるように構成される、請求項8又は9に記載の表示装置。
- 前記NSベースのCC層は、マトリックスを含み、且つ前記フィルタ要素は、前記マトリックス中に埋め込まれる、請求項7~10のいずれか一項に記載の表示装置。
- 前記フィルタ要素は、色素、インク、塗料、又はポリマー材料を含む、請求項7~11のいずれか一項に記載の表示装置。
- 前記NSベースのCC層は、発光性ナノ構造を含む、請求項1~12のいずれか一項に記載の表示装置。
- 前記NSベースのCC層は、セグメント化されたNSベースのCC層のアレイを含む、請求項1~13のいずれか一項に記載の表示装置。
- 前記NSベースのCC層は、
赤色光を放出するように構成された発光性ナノ構造の第1の集団を有する第1の領域と、
緑色光を放出するように構成された発光性ナノ構造の第2の集団を有する第2の領域と
を含む、請求項1~14のいずれか一項に記載の表示装置。 - 前記NSベースのCC層は、
赤色光を放出するように構成された発光性ナノ構造の第1の集団を有する第1の領域と、
緑色光を放出するように構成された発光性ナノ構造の第2の集団を有する第2の領域と、
青色光を放出するように構成された発光性ナノ構造の第3の集団を有する第3の領域と
を含む、請求項1~15のいずれか一項に記載の表示装置。 - 前記NSベースのCC層と前記光抽出層とを含むLCDモジュールを含む、請求項1~16のいずれか一項に記載の表示装置。
- 前記LCDモジュールは、
前記一次光を偏光させるように構成された第1の偏光フィルタと、
前記偏光した一次光の偏光角を調節するように構成された液晶層と、
前記NSベースのCC層と前記液晶層との間に配置され、前記液晶層から前記NSベースのCC層への前記偏光した一次光の透過を制御するように構成された、第2の偏光フィルタと
を更に含む、請求項17に記載の表示装置。 - 表示装置を製造する方法であって、
前記方法は、液晶表示(LCD)モジュールの第1の部分及び第2の部分を形成することと、前記LCDモジュールの前記第1の部分上に前記LCDモジュールの前記第2の部分を配置することと、前記LCDモジュールの前記第2の部分上に表示画面を配置することと、を含み、
前記第1の部分を形成することは、前記表示装置のバックライトユニット(BLU)上に液晶層を配置することと、前記液晶層上に偏光フィルタを配置することと、を含み、
前記第2の部分を形成することは、光学的に透明な基板上に光抽出層を形成することと、前記光抽出層上にナノ構造ベースの色変換(NSベースのCC)層を形成することと、を含む、
方法。 - 前記光抽出層を形成することは、前記光学的に透明な基板上にナノ構造特徴部をパターン形成することを含む、請求項19に記載の方法。
- 前記光抽出層を形成することは、前記光学的に透明な基板上にナノ構造特徴部を転写印刷することを含む、請求項19又は20に記載の方法。
- 前記光抽出層を形成することは、前記光学的に透明な基板上にナノ構造特徴部を繰り返しパターン又はランダムパターンで転写印刷することを含む、請求項19~21のいずれか一項に記載の方法。
- 前記光抽出層を形成することは、前記NSベースのCC層のマトリックス材料の屈折率に等しい屈折率を有する材料を用いてナノ構造特徴部をパターン形成することを含む、請求項19~22のいずれか一項に記載の方法。
- 前記光抽出層を形成することは、約10nm~約100nmの範囲の横寸法を有するナノ構造特徴部をパターン形成することを含む、請求項19~23のいずれか一項に記載の方法。
- 前記光抽出層を形成することは、約10nm~約100nmの範囲の縦寸法を有するナノ構造特徴部をパターン形成することを含む、請求項19~24のいずれか一項に記載の方法。
- 前記光抽出層上にNSベースのCC層を形成することは、
前記光抽出層上に遮光要素を配置することと、
前記遮光要素上に前記NSベースのCC層を配置することと
を含む、請求項19~25のいずれか一項に記載の方法。 - 前記NSベースのCC層を形成することは、前記光抽出層上に前記NSベースのCC層を直接配置することを含む、請求項19~25のいずれか一項に記載の方法。
- 前記LCDモジュールの前記第1の部分上に前記LCDモジュールの前記第2の部分を配置することは、前記NSベースのCC層を前記偏光フィルタと結合することを含む、請求項19~27のいずれか一項に記載の方法。
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