JP7188650B2 - 反射防止膜付透明基体および画像表示装置 - Google Patents
反射防止膜付透明基体および画像表示装置 Download PDFInfo
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- JP7188650B2 JP7188650B2 JP2022537984A JP2022537984A JP7188650B2 JP 7188650 B2 JP7188650 B2 JP 7188650B2 JP 2022537984 A JP2022537984 A JP 2022537984A JP 2022537984 A JP2022537984 A JP 2022537984A JP 7188650 B2 JP7188650 B2 JP 7188650B2
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Description
(A)視感透過率が20~90%であり、(B)D65光源下の透過色b*値が5以下であり、(C)前記反射防止膜の最表面層の視感反射率(SCI Y)が0.4%以下であり、(D)前記反射防止膜のシート抵抗が104Ω/□以上であり、(E)前記反射防止膜は、互いに屈折率が異なる誘電体層を少なくとも2層積層させた積層構造であり、(F)Diffusionの値が0.2以上であり、かつ拡散光の明度(SCE L*)が4以下であることを特徴とする。
上記の特徴により、本実施形態の反射防止膜付透明基体は、画像表示装置のカバーガラス、特に、車両等に搭載されるナビゲーションシステムの画像表示装置のような車両等に搭載される画像表示装置のカバーガラスとして好適である。
本実施形態に係る反射防止膜付透明基体は、視感透過率が20~90%である。視感透過率が上記範囲であれば、適度な光吸収能を有するため、画像表示装置のカバーガラスとして使用した場合に、カバーガラスと多層膜との界面からの反射を抑制できる。これにより画像表示装置の明所コントラストが向上する。
本実施形態に係る反射防止膜付透明基体は、前記多層膜のD65光源下の透過色b*値が5以下である。b*値が上記範囲であれば、透過光が黄色みを帯びていないため、画像表示装置のカバーガラスとしての使用に好適である。
本実施形態に係る反射防止膜付透明基体は、反射防止膜の最表面層の視感反射率が0.4%以下である。最表面の視感反射率は透明基体裏面に黒色テープを貼るなどして裏面反射を除去した状態で測定することができる。反射防止膜の視感反射率が上記範囲であれば、画像表示装置のカバーガラスとして使用した場合に、画面への外光の映り込み防止効果が高い。
本実施形態に係る反射防止膜付透明基体は、非成膜面側に液晶ディスプレイを配置し、前記液晶ディスプレイの電源を切った状態での反射防止膜の視感反射率は1.6%以下が好ましい。前記反射防止膜の視感反射率が上記範囲であれば、画像表示装置のカバーガラスとして使用した場合に、画面への外光の映り込み防止効果が高い。
本実施形態に係る反射防止膜付透明基体は、反射防止膜のシート抵抗が104Ω/□以上である。反射防止膜のシート抵抗が上記範囲であれば、反射防止膜が絶縁性であるため、画像表示装置のカバーガラスとして使用した場合に、タッチパネルを付与しても、静電容量式タッチセンサに必要な指の接触による静電容量の変化が維持され、タッチパネルを機能させられる。
Diffusionの値は、透明基体への周囲像の映り込みの度合い、すなわち防眩性に関する指標であり、値が大きいほど、映り込みが抑制され、透明基体の防眩性が高いことを表す。
Diffusionの値=(R2+R3)/(2×R1) 式(2)
本実施形態に係る反射防止膜付透明基体は、反射防止膜の拡散光の明度(L*)が4以下である。反射防止膜の拡散光の明度が上記範囲であれば、画像表示装置のカバーガラスとして使用した場合に、画面への外光の映り込み防止効果が高い。
透明基体は、屈折率が1.4以上1.7以下の材質が好ましい。これはディスプレイやタッチパネルなどを光学的に接着する場合、接着面における反射を十分に抑制できるためである。
上述した多層膜は、スパッタリング法、真空蒸着法や塗布法などの公知の成膜方法を用いて、透明基体の主面に形成できる。すなわち、多層膜を構成する誘電体層又は層を、その積層順に応じて、透明基体の主面にスパッタリング法、真空蒸着法や塗布法などの公知の成膜方法を用いて形成する。
本実施形態の反射防止膜付透明基体は、膜最表面を保護する観点から、上記反射防止膜上に、さらに防汚膜(「Anti Finger Print(AFP)膜」とも称する。)を有してもよい。防汚膜は例えば、フッ素含有有機ケイ素化合物により構成できる。
以下の方法で、透明基体の一方の主面に反射防止膜を形成して、反射防止膜付透明基体を作製した。
分光光度計(島津製作所社製、商品名:SolidSpec-3700)により分光透過率を測定し、計算により視感透過率(JIS Z 8701:1999において規定されている刺激値Y)を求めた。
上記の分光透過率を測定して得られた透過スペクトルから、JIS Z 8729:2004において規定されている色指標(b*値)を求めた。光源はD65光源を用いた。
分光測色計(コニカミノルタ社製、商品名:CM2600d)により反射防止膜の最表面層の視感反射率(SCI Y)および拡散光の明度(SCE L*)を測定した。光源はD65光源とした。反射防止膜の最表面層の視感反射率(透明基体最表面の反射率)は透明基体の裏面に黒色テープを貼ることで裏面反射成分を除去して測定した。また拡散光の明度は、反射防止膜付き透明基体の非成膜面を、アクリル粘着剤を用いて液晶ディスプレイに貼合した状態で測定した。
測定装置(三菱化学アナリテック社製、装置名:ハイレスタUP(MCP-HT450型))を用いてシート抵抗値を測定した。反射防止膜付透明基体の中央にプローブをあて、10Vで10秒間通電して測定した。
測定装置(DM&S社製の装置SMS-1000)を用いて測定し、前述の方法により、Diffusionの値を算出した。結果を下記表1に示す。
誘電体層(1)及び(3)の金属酸化物層を成膜するときの酸素ガス流量を500sccmから800sccmに変更した以外は例1と同様に成膜し、得られた反射防止膜付透明基体についての評価結果を下記表1に示す。
透明基体の一方の主面にアンチグレアTACフィルム(大日本印刷社製、商品名DSR3)をアクリル粘着剤により貼合した以外は例1と同様に誘電体層を積層した反射防止膜を成膜し、得られた反射防止膜付透明基体についての評価結果を下記表1に示す。
例1と同様に透明基体の一方の主面に拡散層としてアンチグレアTACフィルム(トッパンTOMOEGAWAオプティカルフィルム社製、商品名VH66H)をアクリル粘着剤により貼合した以外は例1と同様に誘電体層を積層した反射防止膜を成膜し、得られた反射防止膜付透明基体についての評価結果を下記表1に示す。
例1と同様に透明基体の一方の主面に拡散層としてアンチグレアTACフィルム(トッパンTOMOEGAWAオプティカルフィルム社製、商品名VZ50)をアクリル粘着剤により貼合した。前記拡散層に酸化チタンと酸化ケイ素からなる反射防止膜を以下の方法で成膜した。
透明基体の一方の主面にクリアハードコートTACフィルム(トッパンTOMOEGAWAオプティカルフィルム社製、商品名CHC)をアクリル粘着剤により貼合した以外は例1と同様に誘電体層を積層した反射防止膜を成膜し、得られた反射防止膜付透明基体についての評価結果を下記表1に示す。
例1と同様に透明基体の一方の主面に拡散層としてアンチグレアTACフィルム(トッパンTOMOEGAWAオプティカルフィルム社製、商品名VZ50)をアクリル粘着剤により)貼合し、反射率が高くなるように各層の膜厚を調整した以外は例1と同様に誘電体層を積層した反射防止膜を成膜した。得られた反射防止膜付透明基体についての評価結果を下記表1に示す。
(A)視感透過率が20~90%であり、
(B)D65光源下の透過色b*値が5以下であり、
(C)前記反射防止膜の最表面層の視感反射率(SCI Y)が0.4%以下であり、
(D)前記反射防止膜のシート抵抗が104Ω/□以上であり、
(E)前記反射防止膜は、互いに屈折率が異なる誘電体層を少なくとも2層積層させた積層構造であり、
(F)Diffusionの値が0.2以上であり、かつ拡散光の明度(SCE L*)が4以下であり、例5~7と比較して光吸収能を有し、絶縁性であり、かつ、透過光が黄色みを帯びることがない反射防止膜付透明基体であった。
30 多層膜(反射防止膜)
31 拡散層
32、34 誘電体層
212 第1の表面
214 第2の表面
300 測定装置
350 光源
362 第1の光
364 第1の反射光
366 第2の反射光
368 第3の反射光
370 検出器
A 透明基体
Claims (9)
- 二つの主面を有する透明基体及び該透明基体の一方の主面に拡散層と反射防止膜をこの順で有する反射防止膜付透明基体であって、
(A)視感透過率が20~90%であり、
(B)D65光源下の透過色b*値が5以下であり、
(C)前記反射防止膜の最表面層の視感反射率(SCI Y)が0.4%以下であり、
(D)前記反射防止膜のシート抵抗が104Ω/□以上であり、
(E)前記反射防止膜は、互いに屈折率が異なる誘電体層を少なくとも2層積層させた積層構造であり、
(F)Diffusionの値が0.2以上であり、かつ拡散光の明度(SCE L*)が4以下である反射防止膜付透明基体。 - 前記誘電体層のうち少なくとも1層が、主として、Siの酸化物で構成されており、前記積層構造の層のうち別の少なくとも1層が、主として、MoおよびWからなるA群から選択される少なくとも1つの酸化物と、Si、Nb、Ti、Zr、Ta、Al、SnおよびInからなるB群から選択される少なくとも1つの酸化物との混合酸化物で構成され、該混合酸化物に含まれるA群の元素と該混合酸化物に含まれるB群の元素との合計に対する、該混合酸化物に含まれるB群の元素の含有率が65質量%以下である請求項1記載の反射防止膜付透明基体。
- 前記反射防止膜上に防汚膜をさらに有する、請求項1または2に記載の反射防止膜付透明基体。
- 前記透明基体がガラス基板である、請求項1~3のいずれか1項に記載の反射防止膜付透明基体。
- 前記透明基体がポリエチレンテレフタレート、ポリカーボネート、アクリル、シリコーンまたはトリアセチルセルロース樹脂フィルムから選択される少なくとも1つの樹脂である、請求項1~3のいずれか1項に記載の反射防止膜付透明基体。
- 前記透明基体が、ガラスと、ポリエチレンテレフタレート、ポリカーボネート、アクリル、シリコーンまたはトリアセチルセルロース樹脂フィルムから選択される少なくとも1つの樹脂との積層体である、請求項1~3のいずれか1項に記載の反射防止膜付透明基体。
- 前記ガラスが化学強化されている、請求項4または6に記載の反射防止膜付透明基体。
- 前記透明基体は、前記反射防止膜を有する側の主面に防眩処理が施されている、請求項1~7のいずれか1項に記載の反射防止膜付透明基体。
- 請求項1~8のいずれか1項に記載の反射防止膜付透明基体を備えた画像表示装置。
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