TWI291580B - Light redirecting films and film systems - Google Patents
Light redirecting films and film systems Download PDFInfo
- Publication number
- TWI291580B TWI291580B TW093117147A TW93117147A TWI291580B TW I291580 B TWI291580 B TW I291580B TW 093117147 A TW093117147 A TW 093117147A TW 93117147 A TW93117147 A TW 93117147A TW I291580 B TWI291580 B TW I291580B
- Authority
- TW
- Taiwan
- Prior art keywords
- light
- film
- pattern
- panel
- backlight
- Prior art date
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M21/00—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis
- A61M21/02—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis for inducing sleep or relaxation, e.g. by direct nerve stimulation, hypnosis, analgesia
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/10—Refractors for light sources comprising photoluminescent material
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0018—Redirecting means on the surface of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
- G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0065—Manufacturing aspects; Material aspects
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
- A61B90/30—Devices for illuminating a surgical field, the devices having an interrelation with other surgical devices or with a surgical procedure
- A61B2090/309—Devices for illuminating a surgical field, the devices having an interrelation with other surgical devices or with a surgical procedure using white LEDs
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M21/00—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis
- A61M2021/0005—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis by the use of a particular sense, or stimulus
- A61M2021/0044—Other devices or methods to cause a change in the state of consciousness; Devices for producing or ending sleep by mechanical, optical, or acoustical means, e.g. for hypnosis by the use of a particular sense, or stimulus by the sight sense
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N2005/063—Radiation therapy using light comprising light transmitting means, e.g. optical fibres
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N2005/065—Light sources therefor
- A61N2005/0651—Diodes
- A61N2005/0652—Arrays of diodes
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/06—Radiation therapy using light
- A61N5/0613—Apparatus adapted for a specific treatment
- A61N5/0621—Hyperbilirubinemia, jaundice treatment
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0028—Light guide, e.g. taper
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0031—Reflecting element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2219/00—Legends
- H01H2219/054—Optical elements
- H01H2219/062—Light conductor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2221/00—Actuators
- H01H2221/07—Actuators transparent
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Anesthesiology (AREA)
- General Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Veterinary Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Public Health (AREA)
- General Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Hematology (AREA)
- Acoustics & Sound (AREA)
- Heart & Thoracic Surgery (AREA)
- Pain & Pain Management (AREA)
- Psychology (AREA)
- Manufacturing & Machinery (AREA)
- Pathology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Optical Elements Other Than Lenses (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
- Light Guides In General And Applications Therefor (AREA)
Description
1291580 【發明所屬之技術領域】 本發明係相關於光線改向薄膜以及薄膜系統以用於可 將自一光源朝一垂直於該薄膜之垂直方向之光予以改向。 【先前技術】 光改向薄膜係為一薄透明或是透光光學薄膜或是基底 ’且该薄膜可再將穿過該薄膜之光再分佈以使得自該薄膜 出口之光的分佈係被導向至更為垂直於該薄膜之表面的方 向。直至目前,光線改向薄膜係被提供有在薄膜之光出口 表面上之菱鏡狀凹槽,透鏡狀凹槽,或是金字塔,而這些 構造可改變一用於光線射出該薄膜之薄膜/空氣界面之角 度亚且使得入射光在行經在一垂直於該凹槽折射面之分佈 成份再被分佈於一更垂直於該薄膜之表面的方向上。該光 線改向薄膜可被併合,例如,液晶顯示器而被使用在桌上 型電腦,文書處理器,航空電子顯示器,行動電話機,個 人數位處理器以及類似之東西以使顯示器更明亮。 該薄膜t入口I面大部份具有一透明或是粗糙面之加 =,其係依所需之影像外觀而定。一粗糙面之加工可產生 -較軟影像但是由於該粗糙面以及擴散表面所造成額 射以及最終光損耗之故而使該影像並不明亮。 、 凹 此 直 直至目如大邛知之應用係使用兩個相互旋轉放置之 槽^膜以使得在各別薄膜中之凹槽係形成為相纟⑽度。 -安裝之理由係一凹槽化之光改向薄膜會將行經在:垂 於該凹槽之折射面上之入射光的分量再分佈於朝向垂直 !291580 於該薄膜表面之方向。因此,為了 罐赠主I L ^ 固方向將改向至該 潯膜表面,就必品要將兩個凹槽薄 士 ^ . 哥勝瑨相互旋轉90度;其 中一潯膜層係將行經在它的凹槽方向 ,. ^ 置面的光予以改 向,而另一溥膜層係將行經在它的 予以改向。 …方向之垂直面的光 2過去所作之各種方法係來製造—單_層光線改向薄 Μ,其將入射光分佈在相互9〇度之 」聊之分ΐ予以改向 。元成此一改向薄膜之一已知方, 万式為棱供一單一層,且該 运”有兩組互垂直延伸之凹槽而形成一 h > u取金子塔結構以將行 經在如此兩方之光予以改向。铁 …、而,如此一薄膜所產生光 之亮度遠低於由兩薄膜層且每一具有被架構相互旋轉9〇度 :單,,此乃因在單一層中被第二組凹槽所除去之該 第一凹槽的之面積將可嬅俱脾氣 卜, 囬積肘付將母一行經的光實質減少5〇% 之表面面積予以減少。 此外,直至目則,光線改向薄膜之凹槽係被建構成可 使得所有凹槽以相同之角度,A約為45度,接觸至該薄膜 之表面。,匕_設計係M定自肖光源之光的固冑之擴散角分 佈’且該光源係朗伯(lambertian)源,使用—印刷或是技 神T以抽取光之为光面板’或是一在重擴散器後之背光面板 光線改向薄膜,其中所有光改向表面係以相同角度接 觸該薄膜,不是被最佳化於用於—光源且該光源具有在該 光源上方之不同面積處之一方向性發射分量。例如,繞著 現代间效率照尚壳度背光之平均角度係隨著與該光源之 距離而不同,且該角度係使用凹槽或是微光學表面以抽出 1291580 光;又要求-介於該光改向表面與該薄膜平面之不同角度 以最佳地將光改向至朝向垂直於該薄膜。 因此,就存在有-能產±更軟影像之光線改向薄膜之 需求,然而消除了相關於在薄膜之光輸入側上之一粗糙或 是擴散加工的亮度上之減少。同樣地,就存在有一能產生 更軟影像之光線改向薄膜之f求,且該薄膜能將行經平行 於在-凹槽薄膜之折射表面之一部份光予以改向,如此咳 光將會較使用菱鏡或是透鏡凹槽之—單—層者更亮。此: ’就存在有-能補償光之不同角分佈之光線改向薄膜之需 求,其中該光係可能離開在光源上方之特定光源又該光 源為例如用來照亮液晶顯示器之背光。同樣地,就存在有 -之光線改向薄膜之需I’且該薄膜係被匹配或是被調整 ::背光或其他光之光輸出分佈以使得重置向或改向自該 月光之更多的入射光於一所需之視角内。 【發明内容】 本發明係相關於光線改向薄膜以及光線改向薄膜系統 ^可將自月万、光或其他光源所發射出的更多之光予改 向至-更垂直於該薄膜平面’並且係相關於一光線改向薄 膜且該光線改向薄膜可產生一較軟的影像而不減少為了增 加有效性,而在薄膜$本心 、之光輸入側上具有一粗糙或是擴散加 工上之亮度。 、,興Λ ^膜之光出口表面具有一定義良好形狀之分離各別 !子兀件之圖案以用於折射該入射光分佈而使得射出該薄 月果之光为佈係在於一更垂直於該薄膜平面之方向上。這些 Ϊ291580 光予元件可藉由在該薄膜之出口表面上之凹陷或凸出 而形成的,並且包括一或是更多之傾斜表面以用於將入射 光折射至-垂直該出口表面之方向上。這些傾斜表面可以 < ja包括平坦及彎曲表面之一組合,且該組合將光改向在 :所需之視角内。同時,該表面之曲#,或是該各別光學 70件之考曲面積與平坦面積之比值以及該彎曲與平坦表面 之週邊外形可被改變以調整該薄膜之光輸出分佈,並且用 來在與該薄膜併合使用之顯示裝置之視角最佳化。此外, 矛面之曲率,或疋該各別光學元件之彎曲面積與平坦面 積之比值可被改變以將在行經一平行於一菱鏡或透鏡凹槽 薄膜之凹槽之平面内之更多或更少的光予以改向。而且該 各別光學7L件之之尺寸及數量,以及該各別光學元件之表 面的曲率可破選擇以產生一更多或更少擴散輸出,或是將 來自該光源之輸人光分佈予以隨機化以產生一較軟更擴散 之光輸出分佈,但仍維持該光輸出分佈在一繞著垂直該薄 膜之方向的所需定角域内。 該溥膜之光入口表面可以具有一光學鍍膜,比如一抗 反射鍍膜,一反射極化器,一延緩鍍膜或一極化器。同時 ,一粗糙或是擴散組織可以依據所需之外觀影像而被提供 在光出口表面上。一粗糙加工可產生一較軟影像但並不亮 Ο 在該薄臈之光射出表面上之各別光學元件可以被如此 一方式隨機化以使得消除任何與一液晶顯示器之像素間隔 之干涉。此一隨機化係包括該光學元件之尺寸,外形,位 1291580 ^方向角度或疋岔度。如此消除了擴散哭之需 求以去除波紋或類似效應。而且,該各別光學元;:至少 :些可被-群群地安裝在跨過該薄之出口表面i,且在每 群中之至少-些光學元件具有一可集合地產生對每一群之 平均尺寸或外形特性之不同尺寸或是外形特性,且該特性 係,過薄膜而改變以獲得對任何單#元件之超過加 今"午之特性值並且去除波紋以及與一液晶顯示器之像 素間隔之干涉效應。此外,該各別光學元件之至少一些可 被置向成相互間之不同角度以用於可製^該薄膜之沿著兩 不同軸的再置向/改向的能力。 該各別光學元件之光改向薄膜與該薄膜之A 〇表面相 交角度亦可被改變於跨過一液晶顯示器之顯示面積以使得 整修該薄膜之光改向函數至—光輸人分佈,綠光輸入分 佈係為非均勻地跨過該光源之表面。 該光線改向薄膜之各別光學元件亦需要相互地以一交 錯式,聯鎖式以及/或是相交式架構來重疊,以製造出一 具有極佳表面積覆蓋之光學結構。甚而,該各別光學元件 破-群群地安裝並且—些各別光學元件係被置向於沿著一 軸’而其他的各別光學元件係被置向於其他轴。而且,在 群中之s玄各別光學元件之方向係可以改變。更進而言 之,該光線改向薄膜之各別光學元件之尺寸,外形,位置 以及/或是方向可被改變以考慮到在由一光 分佈的變化量。 70 該光線改向薄膜之光學元件的特性及圖案亦可以被定 10 1291580 做成將該光線改向薄膜最佳化以用於不同型式之光源,且 該光源發射出不同光分佈,例如,一用於單一桌上型燈泡 之圖案’另一用於雙燈泡平坦面板顯示器之圖案,以及等 更進而,光線改向薄膜系統係被提供且該系統中之該 光改向薄膜的各別光學元件之方向,尺寸,位置以及/或 疋外形係被整修為一背光或是其他光源之光輸出分佈以使 得將更多來自背光之入射光予以再置向/改向在一所需之 視角内。同樣地,該背光可能包括可將光準直於一軸之各 別光學畸形器以及該光線改向薄膜可以包括各別光學元件 ’其將光準直於垂直該一軸之另一軸。 為了達成别述以及相關之目的,本發明然後包括卞述 之更詳細敘述及在申請專利範圍中別指出之特點,接下來 之況明以及所提出更詳細之附加圖式可確實解說本發明之 貝知例但疋這些是指示性而不是本發明之各種原理可以 被使用到之數個變化方式。 【實施方式】 圖1以及2係概略地揭示根據本發明之光線改向薄膜 系統1的一形式,且該系統係包括一光線改向薄膜2,其 可將自一背景光BL或其他光源所發射出的更多之光予改向 至更垂直於該薄膜平面。薄膜2可以被用來將光再分佈 於所需之視角之内以得顯示器更亮,且該光係自用於照亮 之成乎所有光源,例如,一顯示器D比如液晶顯示器,其 使用在桌上型電腦,文書處理器,航空顯示器,行動動話 !291580 ,PDAs以及類似東西。該液晶顯示器可以是任何形式並包 括如在圖1以及2概略所示之穿透式液晶顯示器,在圖3 概略所示之反射式液晶顯示器以及在圖4概略所示之穿透 反射式液晶顯示器。 在圖3所示之反射式液晶顯示器D係包括一鄰近背側 之背反射器40以用於將進入該顯示器之周圍光線反射離開 该顯示器以增加該顯示器之亮度。本發明之光線改向薄膜 2係被置放在鄰近該反射式液晶顯示器之頂部以將周圍光 線(或是來自前部光源之光)改向進入該顯示器,且進入方 向係朝向一更垂直於該薄膜平面之方向以可藉由背反射器 之反射回去而在一所需之視角内,以達到使顯示器更亮之 目的。光線改向薄膜2可以被附著至,疊層至或其他方式 固持在一頂靠液晶顯示器之頂部。 在圖4所示之穿透反射式液晶顯示器係包括一被放置 在介於該顯示器以及一背光BL間之穿透反射以用於將進入 該顯不|§之前部之周圍光反射並使其離開該顯示器以增加 在一照亮環境中之顯示器之亮度,以及可用於穿透該背光 經過該穿透反射器並離開該顯示器以照亮在一暗環境中之 顯示器。在此一實施例中,該光線改向薄膜2可以如在圖 4概略所示之不是被放置在鄰近液晶顯示器之頂部就是鄰 近液晶顯示器之底部或是兩者以用於改向或再分佈周圍光 以及/或是自背光之光而使其更垂直於該薄膜之平面,藉 此使光線輸出分佈更可接受地行經過該顯示器並增加今顯 示器之亮度。 / ^ 12 1291580 底8先涛膑系統2係包括一薄透明薄膜或是透明基 ί:別二 薄膜之光射出表面6上之定義良好形狀 r射出件5之—圖案以用於折射該人射光分佈而使 付射出遠缚膜之光的分佈係在-更垂直該薄膜表面之方向 上。 許^之2光學元件5、具有〜較該薄膜之寬度及長度少 夕1又以及長度,並且可以藉由在該薄膜之出口表 面上之凹陷或凸出而形成。這些各別无學元件5係包括至 :-傾斜面以用於折射入射光並使其朝向垂直該薄膜出口 :面:方向上。圖5揭示在一薄冑2上之該各別光學元件 之-圖案。這些光學元件可以採用許多不同形狀。例如 ,圖5a係揭示一具有共為兩個表面ι〇之非菱鏡光學元件 该兩者表面係傾斜。被揭示在圖5a之-個表面10係 平面或是平坦狀,然而其他之表面係脊曲。甚而,兩者表 面1〇,12係互為相交並且與該薄膜之表面相交。另一種方 式地’該各別光學元件之兩者表面1〇,12可以如被概略揭 示在圖5 b之彎、曲狀。 另一種方式地,該各別光學元件5可以每一僅具有— 表面’其係成彎曲狀並傾斜及相交該薄膜。圖5c係揭示一 如此光學元件5,其具有-圓錐13外形,然而圖5d揭示 另一具有半球或是圓頂外形14之光學元件。同樣地,如此 光學元件可以具有超過一個相交該薄膜之傾斜表面。 圖5e揭示-具有總共三個表面之光學元件5,且這三 個表面相交該薄膜而且互為相交。兩個表面15以及心 13 J291580 彎曲,然而第三個表面17係平面的。 圖5f係揭示一具有一 兔子塔18外形之一光學开土 狀=塔再具有互為相交且與該薄膜相交之::角 ::面广該金字塔18之側面19可以是就如…: 之:同大小以及外形’或是該金字塔18之側面19可 从被延展成使得該側面丨 了 外形。同樣地,胃光學& # 周邊 .干b 了 乂具有任何數量之平面壯 之傾斜側面。圖5h揭示一且古阳加τ 面狀 八有四個平面狀傾斜側面2〇之 先學70件5,然而圖5i揭示一且古\加τ 之光學元件5。 ㈣八個平面狀傾斜側面2〇 該各別光學元件5可以亦具有超過一個彎曲狀以及超 ^個平面狀傾斜表面,且其全部相交該薄膜。圖5j揭示 、先學兀件5,其具有—對相對地相交之傾斜平面側面u 以及相對地彎曲或弧狀之端面或是側φ 23。更進而言之, 該傾斜平面側面22以及彎曲端面或側面可以具有如。圖5k 及51所示之不同傾斜角度之斜面。甚而,該光學元件5可 以具有至少-個並不與該薄膜相交之彎曲表面。一如此光 學元件5係被揭示在圖.5mt,其包括一對相對地相交之傾 斜平面側面22以及相對地彎曲或弧狀之端面或是側面μ ,以及一相交該相對傾斜側面及相對彎曲端面之彎曲或弧 狀頂部24。更進而言之,該光學.元件5可被彎曲成沿箸其 長度方向’其就如在圖5η中所示。 在該各別光學元件5提供具平面以及彎曲表面之組合 係可改向或是再份佈成較具有一凹槽薄膜所能提供之較大 14 1291580 視角。同樣地,該表面之曲率,或是該各別光學元件之彎 曲面積與平面面積之比值可被改變成整修該薄膜之光輸出 分佈以定做出一與該薄膜併合使用之顯示裝置之觀視面積 該薄膜2之光入口表面7可以具有一光學鍍膜25(請 視圖2)比如一抗反射鍍膜,一反射極化器,一延緩鍍膜或 是一極化器。同樣地,一粗糙或是一擴散組織可視所需影 像外觀之需要而被提供在該光入口表面7上。一粗糙加工
可產生一較軟影像但為不夠亮。本發明之光學元件5 之平面以及彎曲表面之組合可以被架構成將以各個方 向撞擊該薄膜之一些光線予以改向以產生一較軟影像而不 需要一額外擴散器或是粗糙加工在該薄膜之入口表面上。 該光線改向薄膜2之各別光學元件5亦需要相互地以 一交錯式,聯鎖式以及/或是相交式架構來重疊,以製造 出一具有極佳表面積覆蓋之光學結構。例如,圖6, 了,= 以及15揭示相互交錯式之光學元件5 互相交式之光學元件5 ;以及圖11和 式之光學元件5。
圖840係揭示相 12係揭示相互相交 爸向,該无琛 密度’位置,方向’高度或是深度。外形,以及 η 寸可以被匹配或是被調整為—f光BL或其他光源 = 輸出分佈以考慮到在由背光所射出光之分 疋一 達到將更多由背光所射出光再分佈於所需視角之目史化量以 的。例如,該光學元件5之傾斜表面(例:,表面 15 1291580 10, 12)與該光線改向薄膜2相交之角度可以隨著該背光虬 與该一光源26之距離之增加而改變,以考慮到背光射出光 線R之角度係隨著與該光源距離之增加而不同,其概略如 圖2中所示。同樣地,該背光本身可以被設計成以更低的 角度射出更多光線以增加由該光源所射光之量,並且該背 光依賴該光線改向薄膜以將該所射出之光再分佈於所需之 視角内。以此一方式,該光改向薄膜2之光學元件5可被 選擇與該背光之光學畸形器相併合工作以產生一自該系統 之最佳化輸出光線角度分佈。 圖2, 5以及9係揭示各別光學元件5之不同圖案,其 皆具有相同之高度或是深度’然而圖7,8,1〇,14以及14係 揭示各別光學元件5之不同圖案,其皆具有不同外形,大 小’以及高度或是深度。 該各別光學元件5可以被隨機形成在該薄膜2之上, 其=如圖‘16和17所示,且形成之方式係以達到可消除 任何與一液晶顯器之像素間隔之干涉的目的。如此消除了 ,在圖i以及2所示之藉由光學擴散層3。來去除波紋以及 類似效應的需求。甚而’至少一些該各別光學元件5 可被-群群32地安裝在跨過該薄膜之出口表面上,且 該君在每:群中之至少-些光學元件具有可集合地產生對每 一群之平均尺寸或外形特性之不同尺寸或外形特性,且兮 特性係跨過薄膜而改變以獲得對任 " 工交k 九學凡件之超過加 1之特性值並且去除波紋以及與—液晶顯示 器之像素間隔之干涉效應。例如,在每_群“中之至 1291580 沙一些光學元件5可以具有一不同之深度或是高度,其可 集合地產生對每一隨著跨過該薄膜而改變的群而言之平均 深度或是高度特性。同樣地,在每一群中之至少一些光學 το件可以具有不同之傾斜角度,其可集合地產生對每一 隨著跨過該薄膜而改變的群而言之平均傾斜角度。更進而 ,在每一群中之該光學元件之至少一傾斜表面可以具有不 同之見度或長度,其可集合地產生對每一隨著跨過該薄膜 而改變的群而言之平均寬度或長度特性。 在該各別光學元件5包括平面以及彎曲表面丨〇 組合之中,該彎曲表面12之曲率,或是該各別光學元件之 彎曲面積與該平面面積之比值以及該彎曲與平面表面之 周邊外形可以被改變以整修該薄膜之光輸出分佈。此外, 該彎曲表面12之曲率,或是該各別光學元件之-曲面積盥 該平面面積之比值係可以被改變以將行經在一平面中之更 多或更少的光μ改向’且該平面為平行於—菱鏡或透鏡 凹槽薄膜内之凹槽’因而部份地或完全地取代—用於光線 改向薄膜之第二層的需求。同樣地…—些各別光學元 件可以如在圖13及16概略所示地被置向為其相互間係不 同的角度以將更多由一光源所射出之光再分佈成沿著兩個 不同的軸且分佈在一更垂直該薄膜表面之方向i,因而部 份地或完全地取代一用於光線改向薄膜之第二層的需求。 然而’吾人應重視到如此光改向薄膜之兩層且每一具有 該薄膜上之各別光學元# 5之相同或是不同之圖案:、且1 兩層可以被置放在介於-光源與具有兩層為相互間之 17 1291580 (或是其他大於ο度且小於9G度之角度)之觀視面積之間以 使得在各別薄膜上之各別光學元件可將更多該一光源所射 出且行經在不同平面方向之光予以再分佈於一更垂直各 薄膜之表面之方向上。 同樣地,該光線改向薄膜2可具有光學元件5之一圖 案’且該圖案係就如在圖15中所示地在不同位置而改變二 將自-光源或是其他光源之不同位置的光線輸出分佈予以 再分佈至朝向一垂直該薄膜之方向。 更進而言之,光線改向薄膜2之光學元件之特性及圖 案可以被定做以將用於不同型且發射不同光分佈之光源之 光改向薄膜予以最佳化,例如,一圖案用於單一燈泡桌上 垔另一圖案用於雙燈泡平面面板顯示器,以及等等。 圖Π揭示該一以輻射狀地自該薄m 2之外側邊緣朝向 中心安裝之光學元件5,其可將自—背光BL之光線輸出分 佈予以再分佈且該背光係沿著該背光之四側邊緣接收來自 冷陰極I燈泡2 6之光。 —圖18係揭示一以跨過該薄膜2之角度化群32之圖案 被安裝之光學元件5,其使薄膜被整修成將來自背光BL 2 光線輸出分佈予以再分佈且該背光係沿著該背光之一輸入 邊緣接收來自一冷陰極敗燈'泡26或是複數個發光二:體 26° 圖19揭示光學元件5,其係以面對該薄膜之一角落之 -=射型目t而被安裝以可* 一背光之光線輸出㈣予以 再分佈且該分佈係在一角落被一發光二極體26所照亮。圖 18 1291580 • * 20揭示揭示光學元件5 ’其係以面對該薄膜之一輸入邊緣 、 之一中心點之一輻射型圖案而被安裝以可將一背光之光線 輸出分佈予以再分佈且該分佈係在該背光之輸入邊緣之一 中心處被一發光二極體26所照亮。 圖21揭不一具有光學凹槽35之光線改向薄膜2,且 該凹槽係延伸跨過該薄膜並為以一彎曲圖案面對該薄膜之 角落以可將一背光之光線輸出分佈予以再分佈且該分佈 係在一角落被一發光二極體26所照亮;然而圖22 —24揭示 -具有光學凹槽35之圖案之光線改向薄膜2,且該凹槽係· 延伸跨過該薄膜並面對沿著該薄膜之一邊緣之一中心點, 又該薄膜之曲率係隨著與該一邊緣之距離之增加而減少以 可將一为光BL之光線輸出分佈予以再分佈且該分佈係被一 _ 發光二極體26在該背光之一輸入邊緣之中心點處予以邊緣 . 照免。 在該光線改向薄膜2具有一在其上之光學元件5之一 沿著該薄膜長度方向上改變之圖案4〇之中,該薄膜2之一 卷41可以被提供有一在其上之重復光學元件圖案,其就概籲 略如圖15所示,以允許該圖案之最適合一特定應用之一選 定面積可自該卷薄膜被晶粒切除。 該背光BL可以實質地平坦,或是彎曲,或是可以為一 單層或是多層,並且可以如所需要地具有不同厚度以及外 形。甚而,該背光可以為彈性或是剛性,以及可以被多種 化合物製成。更進而,該背光可以是中空,其被填有液體 ,氣體,或是固體,以及可以為洞穴或背脊。 19 1291580 同樣地’邊光源26可以為任何型,且該型,例如,包 括"弧形燈泡,可 j W被加色,被填充或被塗之發光燈泡, 一鏡子終端燈泡,一綠】 、、、東1光’一函素燈,一發光二極體 (led)’ 一自_ LED之晶片,一氖燈泡,一冷陰極氟燈泡, :自遙遠光源所傳輸之一光學光纖管,一雷射或是一雷射 „二或是任何其他適當之光源。此外,該光源26可以 疋:色才,化之led,或是多顏色化輻射源之一組合以達到 可提仏所冑色彩或白色光輸出分佈。例如,複數個顏色 光:=顏色之LEDS(即,紅,藍,綠)或是具有多色光晶 ,單 LED可被使用來藉由改變每一各別顏色光之強 度以製造白光或是任何其他顏色光輸出分佈。 光學畸形器之-圖案可被提供在該背光BL之一或是兩 側:上 < 右需要的話’被提供在該背光之-或兩側面上 ,或更夕被璉定之面積上。就如在此所使用到,該名詞 先學畸形器係指在-表面,以及/或是錢膜或表面處理之 在外形上或幾何之改變,且該改變可造成一部份的 先將會從該背光射出。這些畸形器可以以多種方式被 “、,例如,藉由提供一油印圖案,,圖帛,加工圖 -印刷圖案,,印圖案,或一鑄鎸圖案或類似之 東西在該背光之選定面積上。一油或塵印圖案可以藉由例 如印刷圖案’絲印刷圖案,喷墨,熱傳送薄 膜製程或類似而被施力口。該畸形器亦可以㈣刷在一 板或H,如此則使其用來施加該畸形器至該背光。 此一板或薄膜可變成該背光之永久部件,例如,藉由附著 20 1291580 或其他方式之定位該板或薄膜並使其靠著該背光之一或兩 側面以達到產生所需效應之目的。 藉由改變在該背光之上哎县力 、赛上L 次疋在其中之密度,不透光或 透先’外形’深度,顏色,面積,折 ’則該背光之光輸出便能被控制 二 釗呤北ί 遠畸形斋可以被用來控 制该月光之一光射出面積之光輸 R /斗、θ ㈡刀比。例如,更少以 及/或疋更小尺寸之畸形器可被 從置在需要更少光輸出之 地才反地’一較大百分比以及哎是龄士 d / , 次疋較大畸形器可被放置 在而要更多光輸出之處。 在該背光之不同面積中之畸 /七曰甘 〜DO之改變該百分比以及 /或疋其尺寸係必需的以達到提 目的。灵質地均勻光輸出之 嗎之面接士 之先里將會—般地在接近該光 “、 賫中比起其他更遠離該光源面積來y , 整在該背光内之光變化,例如,且該調 成^此Μ、ί愈遠離該光源處之一崎形器之更密濃度達 成口此自该背光造成-更均勾之光輸出分佈。 5亥畸形器亦可以被用來控制自該背光 分佈以適合—特定瘅 輸出先線角度 液晶… 如果該背光係用背照亮- 背光一刼從^先改问薄臈2係與該 I併用)將該由背光所射出 線角度以使η ^ 出先線予以改向在預定射 則該光輪出將合更有效率"、過。亥液曰曰顯示器, 以被用來,軚γ π ^ -之圖案亦可 Μ可歸因於該背光之光抽出之光 光學畴形哭 文化0吞亥 之圖案可被印刷在該背光表面面積上,且其係 21 1291580 藉由使用油印,油 ,錢膜,格日匕, 狄 樹月曰或類似之-寬頻譜,其 耗圍從亮光至不透光的或兩者,並且該畸形器可以使用半 ::離技,來改㈣形器之覆蓋。甚而,該光學崎形器之 圖木可以是多層或是在折射率上之改變。 光學畸形器之印刷圖案可以在外形上改變,比如點, ί:形,鑽石形’橢圓形,星形’隨機形或類似。而且, 母-吋六十條線或更細之印刷圖案係需要地予以採用。如 =得在該㈣圖案中之畸形器或外形在―料應用中幾 乎對人類眼睛係看不到,藉此消除了偵側到之 梯狀或帶狀線,其係對於使用較大元件而言則為常見 之光抽出圖案❶此外,該畸形器 ·’·、 弋曰〜+ /口考”哀月先之長度以及/ ==在外形以及/或是尺寸之改變。同樣地,該崎 機放置圖案可被使用在該背光之全部長度… 或…。該畸形器可以具有無特定角度之外形或 圖4:㈣以減少波紋或其他干涉效應。製造這些隨機 法的範例係將使用隨機印刷圖案技術,頻率調變 = 圖案,或是隨機點半調而印刷-外形之圖帛。甚而, ::形器可被色彩化以達到影響在該背光中之顏色校正之 目的1畸形器之顏色也可以在該全部背光中改 出面例如,以提供不同顏色以用於相同或是不同光輸 透鏡=取代該光學崎形器之圖案夕卜,其他包括菱鏡或 所妒成…槽,或是使用更複雜圖案在-鑄模圖案中 /成之各種形狀的凹陷或是抬高表面之畸形器可被鑄模 22 1291580 ,姓刻,壓印,熱轉型,熱壓印類似地在該背光之一或更 多表面積之上或之内。該菱鏡或透鏡表面,凹陷或抬高表 面將使得一部份光線被接觸並自該背光射出。同樣地,該 曼鏡’凹陷或其他表面之角度可以被改變將光導向至不同 方向以產生一所需之光輸出分佈或效應。甚而,該反射或 折射表面可以具有不具特定角度之外形或一圖案以減少波 紋或是其他干涉效應。 月汉射器40可被
……、一,乃扑π从月凡 L 之側Φ b _ 1及2所示,並藉由將自該側面射出之; 反射回去穿過該用於射穿過該對面側之背光而達到改善: 輸出效率之目的。此外,光學畸形器5〇之一圖案可 供在:背光之-或是兩側之上,其如圖…所示,以〗 到改.文光之路控之目的並使得超過内部臨界角以及一部1 光線係自該背光之一或是兩側射出。 圖25-28揭示光學畸形哭
此 形°。且该畸形器可以不是在各J 月先表面積52上之各別突
^innp. r, ^ ^ 1 就疋在该表面積上之. 。在其他之情況中,4 ^ tl· 1 m * 有一句扛 c 母一 乂些光學畸形器50 - 有匕括一反射或是折射表面54之_ ^ 表面在一邊綾„ 4 4之良好疋義之外形,且i 遺、毒5 5相父該各別背本+ 過其長度之妗々处 谷另J月先衣面積52並且具有一: 又之均勻斜面以用於精確 之光。每一 _弗^ + S地控制由母一畸形器所丨 …:邊:Γ 端壁係沿著每-反射/折射表、 Μ之周邊邊緣部份56,且哕 釘衣1 反射或是折射表面54與該面板二係以-較大於-们 之傾斜角的傾斜角來相交於:各表 J貪光表面積5 2以將在^ 23 1291580 表面積上之突出表面積最小化。如此則比起如果該终 端壁 57^ Φ ^ τ- <大出表面積係實質相同於或較大於該反射/折射 54之犬出表面積的話,其可能允許更多畸形p 祜 放置該面板表面積之上或之内。 ° 么立在圖25以及26之中,該反射/折射表面54之周邊邊 緣部份56及相連之崎形器5〇之終端壁⑴系被揭示成實質 地延伸且垂直該畸形器之反射或是折射表面54。另-種方 式:’如此終端壁57可以實質延伸垂直該面板表面積52 ,:就如在圖29及30中所示。如此實質 該 =…之終端壁57之任何突出表面積,藉此= ^面積52上之畸形器之密度可以甚至更進而被增加。 -面;器亦可以是其他良好定義之外形以獲得自 反表面積之_所需光輸出分佈。圖 面…之各別光抽出崎形器58,且每一崎形:表 :致平面,矩形反射,折射表面59以及具 : 過它們的長度和寬戶乃士祕1 1 1斜面牙 。另-種… 壁62之相連終端壁60 壁2,=在Γ形器⑻可以具有彎曲或-狀之側 具概略如在圖32所示。 圖 3d揭不在一面把矣;rr> 63,且每一時形器包括一;:之各別光抽出畸形器 射表面64以及相連之平面狀及*斜二角外形之反射/折 壁65。圖34揭示各別光抽二大致三角外形側壁或是終端 竹丁各別先抽出畸形器66, 面傾斜之反射/折射表s 67,其具有 二包括-平 以及相連之斜終端和斜側壁69及7〇。 彖部份68 24 1291580 圖35揭示各別光抽出畸 带,妙^回 °。 71,其係大致為圓錐外 /然而圖36揭示各別光抽出崎 狀反射/折射表面73以及弧狀终 =具有弧 側…全部混合一起…額二…及弧狀或彎曲 該表面之其他光線予以反射切射表面將自不同方向撞擊 光/面板構件BL,故提供一自二放佈光於跨過該該背 光。 自5亥面板構件之更均勻分佈的 壁之畸形器之反射/折射表面以及終端壁及側 二=狀’如此崎形亦包括平面表面,其相交於該反 面積2平:及終端壁^ 為^面 隔開。圖37,揭示崎形器76, 77以及78 了每崎开面面積上之各別突出物之形式且該畸形器除 係被一與該面板表面面積52平行地隔開之平 5 ~相父外,退分別具有類似於被揭示在圖31,32 二二彡。方式’_4〇揭許多崎形器8〇 81的 I面板表面面積中之各別凹陷 該面:: 凹陷係相交於一平面表面79,其係相對於 線係、、面面積52之大致平面表面而平行地隔開。任何光 來^小於用於自該面板表面面積52射出之臨界角 '、、、任何光線係以内部角大於該臨界角來撞擊嗲平面 /、概略如在圖40中所示。 /崎幵〆為係在該面板表面面積5 2上突出之處,今反 25 1291580 射/折射表面以一角遠離該面板而延伸且在一相反於該光 光原2 6行穿過該面板之方向上,其如在圖2 7以及 29 中所示〇 a分士 , “ 形器係在該面板表面面積5 2内之凹陷 一 反射/折射表面以一角延伸進入該面板且在一大 致相同於錢線自該光源26行穿過該面板構件之方向上, 其如在圖28以及30中所示。 不官該畸形器係凹陷或是突出在該面板表面面積52之 上或之内,5亥畸形器之光反射/折射表面之斜率可以被改 二=使付&擊该表面之光線不是被折射離開該光射出面板 、疋反射回去牙過該面板且自該面板之相對側射出,且該 面板可被蝕刻成自面板射出或是被-光改向薄貞2所覆蓋 之光線予以擴散以產生一所需效應。同樣,在該面板表面 面積土之光學畸形器之圖案可是均勾或需要的話加以改變 以獲得自在該面;& & % f面板表面面積之所需光輸出分佈。圖41及 42,1 示崎形器76及77,其類似於在圖37及38所揭示的 ΓΓ褒成沿著一面板表面面積52之長度及寬度之複數個 大致平均間隔之直線列,然而圖…揭示 : 6及77,其被安裝成沿著-面板表面面積之長度之相互; «之交錯列。 里 同樣地,該光學畸形器之尺寸,其包括寬度,長度以 及冰度或高度以及其角置向及位 本品: 门及位置可以沿著任何給定面板 # 度而加以改變以獲得自該面板 表面面積之所需的光輪出分佈。 崎形器58及58,之-隨機或可二1及46揭不不同尺寸 飞了鉍圖案,其分別類似於在圖 26 1291580 31及32所揭示的並被# a 饭女哀成在一面板表面面積52上之交 錯列’然而圖47揭示外形上類似於圖38所示之畸形器π ’且該畸形器隨著盘兮伞 现m纽離增加或沿著該面板表面面 積之長度以及/或賞;#夕出i 飞見度之先強度減少,而減少其尺寸。該 崎形器5 8及5 8,#姑鹿+ — si < r ^』 ,皮揭不在圖45及46中並被安裝成跨過 该面板表面之箱群82’其在每一蔟群中至少一歧畸形哭且 有不同尺寸或外形特性,且該不同尺寸或外形特性可共同 地產生對每一跨過該面板表面而改變之蒸群的-平均尺寸 ;:卜:特性。例如,在每-料中至少-些崎形器具有不 〜度或南度’ μ的斜率或置向,且其可共同地產生對 :一跨過該面板表面之斜表面的-平均深度或高度特性, 均斜率或置向。同樣地,在每_蔟群中至少— :見度或長度特性。如此則允許吾人可獲得超 =容許之所需尺寸及外形特性’且其產可消除波紋干 寬产圖;8及49概略揭示沿著-面板表面面積52之長度及 4'Λ 所需外形之光學畸形器85的列角方向。在圖 線列fi⑼形器被安裝成沿著該面板表面面積之長度之直 ;6以二但在每一列中之畸形器係被置肖於面對該光源 使传所有畸形器係實質地與自該光源射出之光線為同 於面料2 Γ/ ’該4形1185係類似於圖48也被置向 質地外’在圖49中之畴形器之列87係實 半田射對準於該光源26。 27 1291580
圖50及51概略揭示自—焦距化光源26射出之示範光 線且㈣、距化錢係被_或鑄造成插人在—根據本發 明之-光發面板組件BL之-光編積91之内,係如何 地在其行經穿過該光發面板構件92期間被反射—直到該光 線撞擊在—面板表面積52之上或之内之被良好定義形狀之 各別光抽出畸形器50, 77為止以使得較另一側94更多光將 被反:或是折射離開該面板構件之一側93。在圖5", 心範光線90係揭示為被該畸形器之反射/折射表面μ 所反射在大致同一方向且穿出該面板構件之同一側Μ,缺 而在圖Η中,該錢9G係揭示為在該光線被該面板組: 同側93所反射/折射之前,其係被該崎形器π之弧 狀側壁62所散射成在該面板組件92内之不同方向。根據 本發明之具有良好定義形狀之各別光抽出崎形器之該圖案 能使得60至7_更多的光被接收穿過該面板構件之輸入 邊緣95及將自該面板構件之同一側射出。
由前述中,可明顯視出本發明之該光線改向薄膜可再 分佈更多自—背光或其他光源所射出之光朝向一更垂直於 該薄膜平面之方向上。同樣地,本發明之該光線改向薄膜 及背光可以互相整修或調整以提供一系統,且在該系統中 該光線改向薄膜之各別光學元件可與該背光之光畸形相併 合工作以產生自該系統之一最佳輪出光線角分佈。 雖然本發明已對某些實施例予以揭示及敛述,但明顯 地對那些本行業者當他們讀完及理解本說明書後,則等效 性改變或修正將會發生。特別地,關於由上述元件所完成 28 1291580 之各種功能,該用來描述如此元件之名詞(包括任何參考 至一’,t置”)係被用來對應於,除非另有其他指示,任 何可完成所述元件(即係指功能等效性)之元件,甚至不算 、-構地寺效於可執行在此所述本發明#範性實施例功能之 2揭路7L件。此外’雖然本發明之特點係被揭露在於僅一 Λ知例’但若需要增進功效於任何給定或特定功能的話則 如此特點可與其他實施例之一或更多其他特點相組合。、 【圖式簡單說明】 (一)圖式部分 圖1係根據本發明之光改向薄膜系統的一形式之 略側面圖; 一圖2係圖1所示之背光以及光改向薄膜系統的一部份 之一部份放大側面圖; 以及圖“系根據本發明之光線改向薄膜系統的其 他形式之概略側面圖; 圖5-20係概略立體或是 甘4a - + -^ . 圖,其揭不在本發明之光 線改向缚臈系統上之各別光學元件的不同圖案; r採:不Γ Γ係在°亥光改向薄膜系統上之各別光學元件可 月匕抓用不同幾何形狀之概略立體圖; 圖21係在一面對薄膜話 薄膜之光學凹槽之光峻·弓曲圖案中具有延伸過該 予广心之先線改向薄膜之概略立體圖; 圖2 2係在一面對薄 膜之光〜描 專膜邊緣之中點處之具有延伸過該薄 、先予凹才曰之光線改向薄膜夕仗、目τ m ^ ^ ^ 厚胰之俯視平面圖,且該薄膜在 ^邊緣的㈣愈增加職”愈減少’· 29 !29158〇 终端平面目; 、' ^联n終知祝之 圖24係圖22所示之光線改向薄膜的側面圖; :25以及26係一背景光,光發射面板組件之一表面 積的部份放JU ψ -r- Γ5^ Θ ,且泫圖揭示形成在該背光之一表面 上之各種形式光學畸形器; 叫圖27以及28係分別穿過圖25以及26所示光學畸形 口口之一個的放大縱剖面圖; 圖29以及30係穿過形成在該背光之一表面上之其他 4· %形态的放大縱剖面圖; 圖31 39包含有其他定義良好之各別光學畸形器的各 種圖案之背光表面之放大概略立體圖; 圖40係穿過形成在該背光之一表面上之另一型光學畸 形為的放大縱剖面圖; 圖41以及42係包含有在形狀上類似於其他揭示在圖 打„。以及38且以複數個直線行沿著表面長度方向之光學畸 形杰之背光表面之放大概略俯視圖; 圖43以及44係包含有在形狀上類似於其他揭示在圖 37以及38且以交錯行沿著表面長度方向之光學畸形器之 背光表面之放大概略俯視圖; 圖45以及46係包含有在表面上之一隨機或是可變圖 案之背光表面之放大概略俯視圖; 圖47係一背景表面之放大概略俯視圖,其揭示在當該 ~形益離開光輸入面之距離增加或光強度沿著表面長度方 ^1580 向增加時,則光學畸形器 κ寸增加; 圖48以及49係概略输、曰^ ^ ^ 莳硯圖,其揭示沿著〜北 面之長度及寬度方向之先學_ ^ ^ ^4 %予畸形器的不同角度方向· 圖50以及5“系概略放大立體圖,其揭示自:隹距化 光源所射出的示範性光線係如何地被-背景光之良好定義 形狀之不同各別光學畸形器所反射或是折射。
(二)元件代表符號 1光線改向薄膜系統 2光線改向薄膜 5各別光學元件 6光射出表面 7 光入口表面 8基底 10, 12, 15, 16 表面 14圓頂外形 18金字塔 19三角狀 2 0傾斜側面 22傾斜平面側面 23端面 24頂部 25光學鍍膜 26光源(燈泡或發光二極體) 3 0擴散層 31 1291580 32群 35凹槽 40圖案或背反射器 41卷 50,58,76,77,85光學畸形器 51凹陷或突出 54折射表面 5 5邊緣 56邊緣部份 57, 60, 65, 74 終端壁 59, 67反射/折射表面 62, 75側壁 66, 80光抽出畸形器 69, 70斜側壁 79表面 81凹陷 82簇群 86列 90光線 9 3側 95邊緣 32
Claims (1)
1291580 拾、申請專利範圍: 該背光具 入邊緣係 之面板表 以用於接 有良好定 對於該光 面板表面 上,且該 面板表面 膜糸統, 膜糸統, 膜系統, 面之一組 1 · 一種光線改向薄膜系統,其包括一背光, 有包括至少一輸入邊緣之一光出面板構件,該輸 用於接收自一光源之光,以及至少一用於射出x 2 面,以及一鄰近於該面板表面之一光改向薄膜, 收由該面板表面所射出之光,又該光改向薄膜具 義外形之各別光學元件之一圖案,該光學元件相 改向薄膜的寬度和長度而言是很小,以將來自該 所射出之光予以再分佈朝向一垂直該薄膜之方向 光學元件的尺寸或外形係被整修成將更多來自該 所射出之光予以再分佈於一所需視角内。 2·如申請專利範圍第丨項所述之光線改向薄 其中該至少一些光學元件係以不同角度予以置向 3.如申請專利範圍第丨項所述之光線改向薄 其中該至少一些光學元件係具有不同之斜面角。< 4·如申請專利範圍第丨項所述之光線改向薄 二中该至少一些光學元件係包括平面以及彎曲表 其二Γ面=利範圍…所述之光線改向薄膜系統, Λ :面積與該彎曲表面面積之比值係被選擇以 展生一所需視角。 其中:二利範圍…所述之光線改向薄膜系統, 薄膜。光學70件係以不同角度予以置向成跨過該 錢’以將光再分佈為沿著兩不同軸。 33 1291580 7,如申請專利範圍第丨項 复中核至少一此朵與-μ / 九線改向薄膜系統, ,、中口亥至,。先學凡件係相互重疊、相交或聯鎖。 8·如申睛專利範圍第丨項所述之光 其中該面板構件具有各別光學畸形器之一圖^缚、f统’ :產生一在該面板表面之不同位置處而改::光:::: 9.如申請專利範圍第8項所述之光線改向薄膜 =該面板構件之至少一些畸形器具有—傾斜表面,、且, 學=;皮置向成面對跨過該面板構件之輪入邊緣之; 10i t請專利範圍第9項所述之光線改 其中該面板構件之至少—些畸形ϋ具有至少-料表^ 以用於將撞擊該額外表面之光以不同方向予以 二:佈該光於跨過該面板表面,以產生一由該面板表: 斤射出之光的更均勻分佈。 ,其利範圍第Μ項所述之光線改向薄膜系統 、^ ^斜表面係平面的並且該額外表面係被彎曲。 A如中W專利範圍S 1項所述之光線改向薄膜系統, : = 光猶至該輸入邊緣之光源,- 〇為係被安裝成列,該列係相對於該光源被 馬口之輸入邊緣之一面積而輻射狀地延伸。 背光l3\種光線改向薄膜系統,其包括-具有面板表面之 二I/且該面4反表面具有一在該面表面上之不同位置而 又之光線輪出分佈,以及一鄰近於該面板表面之光改向 34 1291580 薄膜’且該光改向薄膜具有一在該薄膜上之不同位置而改 變之光學元件的圖案,以將來自在該面板表面上之不同位 置之光線輪出分佈予以再分佈至朝向一垂直該薄膜之方向 ’該光學元件相對於該光改向薄膜的寬度和長度而言是很 /Jn 〇 14.如申請專利範圍第13項所述之光線改向薄膜系統 ,其中至少一些該光學元件係改變於下述特性中之至少一
者·角度、旋轉、密度、位置、置向、高度或深度、外形 和尺寸。 • σ申請專利範圍第13項所述之光線改向薄膜系 、 進而包括一鄰近该薄膜之液晶顯示器,且在該薄 上之光學元件的圖案改變造成自該面板表面之光線輸出 佈的角度上之_改變,而使該光線輸出分佈更可為 穿過該液晶顯示器。 又
,盆16·如申請專利範圍第13項所述之光線改向薄膜系 。-中至^ -些光學元件具有至少兩不同外形的表面周 向薄膜系統 一不同外形 17·如申請專利範圍第16項所述之光線改 其中该一個不同外形的表面係平面的,而另 的表面係被彎曲。 1 8·如申請專利範圍第丨3 其中該至少—些光學元㈣相互重疊、 二9.如申请專利範圍第13項所述之光線改向薄膜 至少—些光學元㈣以*同角度被置向以用 35 1291580 光改向為沿著兩不同軸。 缚膜糸統 係被整修 輸出分佈 薄膜系統 係被整修 背光光線 之方向上 2 0 ·如申请專利範圍第13項所述之光線改向 ,其中該光學元件係被安裝成一圖案,且該圖案 成將接收來自一個冷陰極螢光燈之光的背光光線 予以再分佈’而朝向至一垂直於該薄膜之方向上 21 ·如申晴專利範圍第13項所述之光線改向 /、中4光學元件係被安裝成一圖案,且該圖案 成將接收來自兩個或更多個冷陰極螢光燈之光的 輸出为佈予以再分佈,而朝向至一垂直於該薄膜 22. 如申請專利範圍第13項所述之光線改向薄膜系統 :其中該光學元件係被安裝成一圖案,且該圖案係被整修 成將接收來自單一發光二極體之光的背光光線輸出分佈予 以再分佈。 23. 如巾請專利範㈣13項所述之光線改向薄膜系統 、、中^學%件係被安裝成-圖案,且該圖案係被整修 成將接收來自複數個發光二極體之光的背光光線輸出分佈 予以再分佈。 24. 如中請專利範圍第13項所述之光線改向薄膜系統 〜、m學π件係被安裝成_圖案’且該圖案係被整修 成將接收來自周邊照光的背光光線輸出分佈予以再分佈。 25. 如申請專利範圍第13項所述之光線改向薄膜系統 ,其中該光學元件係被安裝成一 、’' ’ 、 汉文衣力乂罕田射狀圖案,且該圖案係 被整修成將角落照光之背光光線輸出分佈予以再分佈。 36 1291580 26·如申請專利範圍第13 ’其中遠光學元件係被安裝成 被整修成將單一聚焦光源所昭 * 4 \ \ \ 再分佈。 27.如申請專利範圍第26 ,其中該光源係一發光二極體 項所述之光線改向薄膜系統 一輻射狀圖案,且該圖案係 光之背光光線輪出分佈予以 項所述之光線改向薄膜系統 拾壹、圖式: 如次頁
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2002
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