TWI622819B - Backlight device and display device therewith - Google Patents

Backlight device and display device therewith Download PDF

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Publication number
TWI622819B
TWI622819B TW105143807A TW105143807A TWI622819B TW I622819 B TWI622819 B TW I622819B TW 105143807 A TW105143807 A TW 105143807A TW 105143807 A TW105143807 A TW 105143807A TW I622819 B TWI622819 B TW I622819B
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frame
liquid crystal
crystal display
adhesive layer
diffusion adhesive
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TW105143807A
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Chinese (zh)
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TW201734522A (en
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Tetsuro Ochi
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Japan Display Inc
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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
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/1055—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • 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
    • G02B6/0051—Diffusing sheet or layer

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

本發明之實施形態之背光裝置具備：框狀之框架16，其由透明之樹脂形成；第1擴散黏著層24a，其設置於框架之第1面，且具有光擴散性；第2擴散黏著層24b，其設置於框架之與第1面為相反側之第2面，且具有光擴散性；反射片RE，其經由第1擴散黏著層而貼附於框架；導光板LG，其於框架內載置於反射片上；及光源，其將光入射至配置於框架內之導光板。A backlight device according to an embodiment of the present invention includes: a frame-shaped frame 16 formed of a transparent resin; a first diffusion adhesive layer 24a provided on the first surface of the frame and having light diffusivity; and a second diffusion adhesive layer 24b, which is provided on the second surface of the frame opposite to the first surface and has light diffusivity; the reflection sheet RE is attached to the frame through the first diffusion adhesive layer; the light guide plate LG is inside the frame Mounted on a reflective sheet; and a light source that enters light into a light guide plate disposed in a frame.

Description

背光裝置及具備其之顯示裝置Backlight device and display device having the same

此處所述之實施形態係關於一種背光裝置及具備其之顯示裝置。The embodiment described herein relates to a backlight device and a display device including the same.

近年來，廣泛使用液晶顯示裝置作為智慧型手機、個人輔助設備(PAD，personal assistant device)、平板電腦、汽車導航系統等之顯示裝置。一般而言，液晶顯示裝置具備液晶顯示面板、及重疊配置於該液晶顯示面板之背面且將液晶顯示面板照明之面狀照明裝置(背光裝置)。先前之背光裝置具有反射層、導光板(light guide)、光學片、作為光源之LED(Light Emitting Diode，發光二極體)、樹脂製且矩形框狀之框架。反射層、導光板、光學片係相互重疊而積層配置並配置於框架內。藉此，反射層、導光板、光學片藉由框架保持及定位。 又，提出有如下構成，即，將框架嵌入於金屬板製之收容殼體(背光蓋)中，進而於框架之中空部配置反射層、導光板、光學片。 近年來，伴隨顯示區域之大型化，要求液晶顯示裝置更窄邊框化及薄型化。然而，上述背光裝置之框架之寬度、厚度等尺寸越來越接近能夠以射出成型形成之極限尺寸，而難以滿足該要求。 又，伴隨窄邊框化，背光裝置之有效照明區域與液晶顯示有效區域之公差亦變小。因此，於將背光裝置安裝於液晶顯示裝置時，液晶顯示有效區域會偏移至有效照明面積外，其結果有顯示品質降低之虞。In recent years, liquid crystal display devices have been widely used as display devices for smart phones, personal assistant devices (PADs), tablet computers, and car navigation systems. Generally, a liquid crystal display device includes a liquid crystal display panel and a planar lighting device (backlight device) arranged on the back surface of the liquid crystal display panel and illuminating the liquid crystal display panel. A conventional backlight device includes a reflective layer, a light guide, an optical sheet, an LED (Light Emitting Diode) as a light source, and a rectangular frame-like frame made of resin. The reflection layer, the light guide plate, and the optical sheet are superimposed on each other, and are stacked and arranged in a frame. Thereby, the reflection layer, the light guide plate, and the optical sheet are held and positioned by the frame. In addition, a configuration is proposed in which a frame is embedded in a storage case (backlight cover) made of a metal plate, and a reflective layer, a light guide plate, and an optical sheet are disposed in a hollow portion of the frame. In recent years, as the display area becomes larger, liquid crystal display devices have been required to be narrower and thinner. However, the width, thickness, and other dimensions of the frame of the above-mentioned backlight device are getting closer to the limit size that can be formed by injection molding, and it is difficult to meet this requirement. In addition, with the narrow bezel, the tolerance between the effective illumination area of the backlight device and the effective area of the liquid crystal display also becomes smaller. Therefore, when a backlight device is mounted on a liquid crystal display device, the effective area of the liquid crystal display is shifted out of the effective illumination area, and as a result, display quality may be reduced.

根據一實施例，背光裝置具備：框狀之框架，其由透明之樹脂形成；第1擴散黏著層，其設置於上述框架之第1面，且具有光擴散性；第2擴散黏著層，其設置於上述框架之與上述第1面為相反側之第2面，且具有光擴散性；反射片，其經由上述第1擴散黏著層而貼附於上述框架；導光板，其於上述框架內載置於上述反射片上；及光源，其配置於上述框架內，且將光入射至上述導光板。According to an embodiment, the backlight device includes: a frame-shaped frame formed of a transparent resin; a first diffusion adhesive layer provided on the first surface of the frame and having light diffusion; and a second diffusion adhesive layer, It is provided on the second surface of the frame opposite to the first surface and has light diffusivity; a reflective sheet is attached to the frame through the first diffusion adhesive layer; a light guide plate is disposed in the frame The light source is placed on the reflective sheet, and the light source is disposed in the frame, and the light is incident on the light guide plate.

下文將參看隨附圖式來描述各種實施例。 再者，揭示只不過為一例，業者於確保發明之主旨而進行之適當變更且能夠容易聯想到者當然包含在本發明之範圍內。又，圖式為了使說明更加明確，有時會相較於實際態樣對各部分之寬度、厚度、形狀等進行模式性地表示，但只不過為一例，並非為限定本發明之解釋者。又，於本說明書及各圖中，對於與在已出現之圖中說明之要素相同之要素標附相同之符號並適當省略詳細之說明。 (第1實施形態) 圖1及圖2係分別表示第1實施形態之液晶顯示裝置之顯示面側及背面側之立體圖，圖3係液晶顯示裝置之分解立體圖。 液晶顯示裝置10例如能夠組入至智慧型手機、平板終端、行動電話、筆記型PC(personal computer，電腦)、攜帶型遊戲機、電子辭典、視訊裝置、汽車導航系統等各種電子設備而使用。 如圖1至圖3所示，液晶顯示裝置10具備：主動矩陣型之平板狀之液晶顯示面板12(liquid crystal display panel(LCD panel))；蓋板14，其重疊配置於作為液晶顯示面板12之一平板面之顯示面12a，且覆蓋整個該顯示面；及背光單元(背光裝置)20，其與作為液晶顯示面板12之另一平板面之背面側對向配置。 圖4係沿圖1之線A-A之液晶顯示裝置之剖視圖，圖5係沿圖1之線B-B之液晶顯示裝置之剖視圖。如圖3至圖5所示，液晶顯示面板12具備矩形平板狀之第1基板SUB1、與第1基板SUB1對向配置之矩形平板狀之第2基板SUB2、及設置於第1基板SUB1與第2基板SUB2之間之液晶層LQ。第2基板SUB2之周緣部藉由密封材料SE而貼合於第1基板SUB1。於第2基板SUB2之表面貼附偏光板PL1而形成液晶顯示面板12之顯示面12a。於第1基板SUB1之表面(液晶顯示面板12之背面)貼附有偏光板PL2。俯視下，偏光板PL2具有較第1基板SUB1之外形尺寸稍大之尺寸，覆蓋第1基板SUB1之整個表面。再者，所謂俯視係指自液晶顯示面板之表面之法線方向視認該液晶顯示面板之狀態。 於液晶顯示面板12中，於在俯視顯示面12a之狀態下成為密封材料SE之內側之區域設置有顯示區域(工作區域)DA。圖像係顯示於該顯示區域DA。又，於該顯示區域DA之周圍設置有邊框區域(非顯示區域)ED。顯示區域為矩形狀，邊框區域呈矩形框狀。液晶顯示面板12係藉由使來自背光單元20之光選擇性地透過至顯示區域DA而顯示圖像之透過型。液晶顯示面板12能夠採用各種顯示模式。例如，可具有與橫向電場模式相對應之構成，亦可具有與縱向電場模式相對應之構成，該橫向電場模式係主要利用大致平行於基板主面之電場者，該縱向電場模式係主要利用大致垂直於基板主面之電場者。 於圖示之例中，於第1基板SUB1之短邊側之端部接合有軟性印刷電路基板(FPC，Flexible Print Circuit)22，該軟性印刷電路基板22自液晶顯示面板12向外側延伸出。於FPC22安裝有驅動IC(integrated circuit)晶片21等半導體元件，作為供給驅動液晶顯示面板12所需之信號之信號供給源。 如圖1至圖5所示，蓋板14例如由玻璃板或丙烯酸系之透明樹脂等形成為矩形平板狀。蓋板14具有較液晶顯示面板12之尺寸(寬度、長度)大之寬度及長度。藉此，蓋板14具有俯視下較液晶顯示面板12大之面積。於蓋板14之背面(液晶顯示面板12側之面、或與對向於觀察者之面為相反側之面)之周緣部形成有框狀之遮光層RS。於蓋板14中，除與顯示區域DA對向之區域以外之區域係被遮光層RS遮蔽。再者，遮光層RS亦可形成於蓋板14之上表面(顯示面)。 蓋板14之背面(裏面)係藉由具有透光性或透明之接著劑或黏著劑、例如包含光學用透明樹脂之黏著片AD而貼附於偏光板PL1。藉此，蓋板14遍及液晶顯示面板12之顯示面12a之整個面而將其覆蓋。再者，黏著片AD形成為與偏光板PL1相同之尺寸，整齊地貼附於偏光板PL1。再者，亦能夠代替黏著片AD而採用將黏著劑塗佈於偏光板PL1及其周緣之構成。 蓋板14之周緣部(periphery)向較液晶顯示面板12之外周緣(periphery)更外側突出。蓋板14之長邊與液晶顯示面板12之長邊隔開特定之間隔(with a prescribed gap)而成為大致平行之狀態。蓋板14之短邊與液晶顯示面板12之短邊隔開特定之間隔而成為大致平行之狀態。於本實施形態中，蓋板14之長邊與液晶顯示面板12之長邊之間隔，即蓋板14之長邊側周緣部之寬度係形成為小於蓋板14之短邊與液晶顯示面板12之短邊之間隔，即蓋板之短邊側周緣部之寬度。 再者，蓋板及液晶顯示面板亦能夠採用使角部成為圓形之構成。於該情形時，無需使全部角部成為圓形，能夠採用僅使1個或2個角部成為圓形之構成。又，能夠採用僅使蓋板及液晶顯示面板之任一者之角部成為圓形之構成、使任一者之角部均成為圓形之構成之兩者。 如圖3至圖5所示，背光單元20具備：矩形狀之框架16，其貼附於液晶顯示面板12之背面；反射片RE，其貼附於該框架16之背面；複數個光學構件，其等配置於框架16內；及光源單元30，其供給入射至光學構件之光。 框架16由厚度T1為0.40 mm(400 μm)以下、例如0.10～0.25 mm(100～255 μm)之片材構成。俯視下，框架16之外形稍大於液晶顯示面板12之外形且小於蓋板14之外形。作為片材，能夠使用具有透光性或透明之樹脂片、例如聚對苯二甲酸乙二酯(PET，polyethylene terephthalate)之片材。再者，此處所使用之樹脂片材，包含使厚度為100～300 μm左右之片材、使厚度薄於100 μm之膜、薄膜等。 如下所述，框架16係藉由對樹脂片材實施沖裁加工而形成，且具有特定之尺寸。又，框架16係遍及全周而形成為均勻之厚度T1，無厚度方向(於剖面觀察時之Z方向)之凹凸。於本實施形態中，框架16之厚度(片材之厚度)T1係設為0.188 mm(188 μm)或0.25 mm(250 μm)。框架16具有第1面SF1及第2面SF2。第2面SF2係與液晶顯示面板12相向(facing)之上表面，第1面SF1係與第2面SF2為相反側(opposed to)之下表面。 框架16具有相互對向之一對長邊部(longwise bar)16a、16b、及相對對向之一對短邊部(sidelong bar)16c、16d。各長邊部16a、16b之寬度W1形成為0.6 mm(600 μm)以下、例如0.4～0.5 mm(400～500 μm)。一短邊部16c之寬度W2係與寬度W1同樣地形成為0.6 mm(600 μm)以下、例如0.4～0.5 mm(400～500 μm)。又，另一短邊部16d之寬度W3係與寬度W2同樣地形成為0.6 mm(600 μm)以下、例如0.4～0.5 mm(400～500 μm)。再者，短邊部16d之寬度W3亦可形成為較W2寬幅。又，於該另一短邊部16d之內側緣側設置有複數個凹部17。 又，以下，亦有時將一短邊部稱為上邊部(upside bar)，將另一短邊部稱為下邊部(downside bar)。又，亦有時將一對長邊部稱為左右邊部(right-and-left bars)。又，亦有時將左右邊部及上邊部一併稱為除下邊部以外之3個邊部。 於框架16之下表面(第1面)SF1上形成有第1擴散黏著層24a。又，於框架16之上表面(第2面)SF2上形成有第2擴散黏著層24b。如圖4所示，第1擴散黏著層24a及第2擴散黏著層24b分別由在透明之黏著劑(binder)中混練有折射率與該黏著劑不同之多數個微小珠粒B而成之具有光擴散性之黏著劑形成。作為黏著劑，例如能夠使用包含丙烯酸系樹脂、聚苯乙烯、聚酯、環氧樹脂、乙烯系聚合物等之黏著劑、UV(ultraviolet，紫外線)硬化黏著劑等。又，作為微小珠粒B，能夠使用透光性之中空二氧化矽粒子、玻璃粒子或合成樹脂製之粒子。又，作為形成微小珠粒之透明之材料，使用藉由紫外線或電子束等電磁輻射使聚甲基丙烯酸甲酯等丙烯酸樹脂、聚對苯二甲酸乙二酯、聚對苯二甲酸丁二醇酯等聚酯樹脂、聚苯乙烯樹脂、聚碳酸酯樹脂、聚甲基戊烯樹脂等熱塑性樹脂、聚丙烯酸酯、丙烯酸胺基甲酸酯、環氧丙烯酸酯等包含低聚物及/或丙烯酸酯之單體等之游離輻射硬化性樹脂硬化之樹脂等且透明性良好者。又，除樹脂以外，只要透明，則亦可為玻璃、陶瓷等。擴散黏著層之光擴散性能夠藉由對微小珠粒B之含量、微小珠粒B之折射率等進行調整而適當調整。於本實施形態中，第1擴散黏著層24a之光擴散性da大於第2擴散黏著層24b之光擴散性db。此處光擴散性db係設置於長邊部16a、16b及短邊部16c上之第2擴散黏著層24b整體之光擴散性，不論該部分之第2擴散黏著層24b由多少層構成。 第1擴散黏著層24a之厚度T2例如形成為0.01～0.06 mm(10～60 μm)，長邊部16a、16b及上邊部16c之第2擴散黏著層24b之厚度T3係形成為0.01～0.06 mm(10～60 μm)。由此，框架16、第1擴散黏著層24a及第2擴散黏著層24b之厚度之合計，例如於成為最大厚度之長邊部16a、16b及上邊部16c側形成為0.32～0.52 mm(320～520 μm)。 於一對長邊部16a、16b，第1擴散黏著層24a及第2擴散黏著層24b之各者具有與長邊部16a、16b之寬度W1相同之寬度，至少框架16之外側面(external surface)與第1擴散黏著層24a之外側面(external surface)及第2擴散黏著層24b之外側面(external surface)為同一平面。於本實施形態中，第1擴散黏著層24a之內側面(internal surface)側及第2擴散黏著層24b之內側面(internal surface)側亦與框架16之內側面(internal surface)為同一平面。或者，於在框架16之長邊部16a、16b之間觀察之情形時，長邊部16a、16b間之內部尺寸(internal dimension)與設置於各個長邊部16a、16b之第1擴散黏著層24a間之內部尺寸(internal dimension)及第2擴散黏著層24b間之內部尺寸(internal dimension)相等。同樣地，長邊部16a、16b間之外部尺寸與設置於各個長邊部16a、16b之第1擴散黏著層24a間之外部尺寸(external dimension)及第2擴散黏著層24b間之外部尺寸(external dimension)相等。 於本實施形態中，於框架16之短邊部16c、16d，第1擴散黏著層24a及第2擴散黏著層24b之各者亦具有與短邊部16c、16d之寬度W2、W3相同之寬度，框架16與第1擴散黏著層24a之外側面彼此、內側面彼此分別成為同一平面。框架16與第2擴散黏著層24b之外側面彼此、內側面彼此分別成為同一平面。或者，於在框架16之短邊部16c、16d之間觀察之情形時，短邊部16c、16d間之內部尺寸與設置於各個短邊部16c、16d之第1擴散黏著層24a間之內部尺寸及第2擴散黏著層24b間之內部尺寸相等。同樣地，短邊部16c、16d之外部尺寸與設置於各個短邊部16c、16d之第1擴散黏著層24a間之外部尺寸及第2擴散黏著層24b間之外部尺寸相等。 於本實施形態中，作為第1擴散黏著層24a及第2擴散黏著層24b，使用在具有透光性之基材之兩面具有黏著層之雙面膠帶。各黏著劑層之厚度能夠藉由變更各基材之厚度而容易地調整。 再者，除下邊部以外之3個邊部16a、16b、16c上之第2擴散黏著層24b形成為厚於下邊部16d上之第2擴散黏著層24b，例如形成為約2倍之厚度。於該情形時，3個邊部16a、16b、16c上之第2擴散黏著層24b能夠採用將厚度與下邊部16d上之第2擴散黏著層24b相同之黏著層積層2層而成者。又，藉由使下邊部16d上之第2擴散黏著層24b薄於長邊部16a、16b上之第2擴散黏著層24b，而形成用以使下述之光源單元30之印刷電路基板32通過之間隙。 又，亦可如圖6A所模式性地表示般，以使第1擴散黏著層24a內設置於上邊部16c之部分之光擴散性相較於設置於左右邊部16a、16b上之部分之光擴散性變低之方式調整微小珠粒B之含量。同樣地，亦能以使第2擴散黏著層24b內設置於上邊部16c之部分之擴散性相較於設置於左右邊部16a、16b上之部分之擴散性變低之方式調整微小珠粒B之含量。 又，亦可如圖6B所模式性地表示般，以設置於左右邊部16a、16b上之第1擴散黏著層24a之光擴散性自下邊部16d向上邊部16c逐漸變高之方式調整微小珠粒B之含量。同樣地，亦能以設置於左右邊部16a、16b上之第2擴散黏著層24b之光擴散性自下邊部16d向上邊部16c逐漸變高之方式調整微小珠粒之含量。 又，亦能採用使圖6A所示之構成與圖6B所示之構成組合之構成，即，以使上邊部16c之第1擴散黏著層24a及第2擴散黏著層24b之光擴散性相較於左右邊部16a、16b之任一位置之光擴散性變低之方式進行調整。例如，採用使上邊部16c上之光擴散性低於左右邊部16a、16b之最靠近光源之位置上之光擴散性之構成。或者，採用使上邊部16c之光擴散性低於左右邊部16a、16b之距光源最遠之位置上之光擴散性之構成。進而，採用使左右邊部16a、16b之長度方向中央部上之光擴散性與上邊部16c之光擴散性相同之構成。 再者，於圖6A、圖6B中，藉由微小珠粒B之數量表示各擴散黏著層之光擴散性之差異，但為了使光擴散性不同，適當採用變更微小珠粒B之粒徑或粒徑分佈或採用折射率、透過率等不同之材料等用以變更光擴散性之方法。 又，亦能夠藉由在與反射片RE對向之框架16之裏面實施白點印刷等，而對該框架16之透光性進行調整。於該情形時，能夠藉由使該白點印刷之點之密度自靠近光源單元30向遠離光源單元30逐漸由疎至密地變化，而使框架16具備對應於自光源單元30之距離之透光性。 如圖3至圖5所示，反射片RE藉由第1擴散黏著層24a而貼附於框架16之下表面SF1，且覆蓋框架16之下表面側。反射片RE係使用膜厚為200 μm以下、較理想為50～90 μm且反射率為90%以上、較理想為95%以上之反射片。又，於在框架16之長邊部16a、16b間之間隔觀察之情形時、及在框架16之短邊部16c、16d間之間隔觀察之情形時，反射片RE均形成為具有與框架16之外形尺寸相等之大小之矩形狀。又，反射片RE之外側面與框架16之外側面排列於同一平面，而非任一者相對於另一者突出之狀態。 背光單元20具有俯視下為矩形狀之導光板LG及重疊配置於導光板LG上之光學片OS，作為收容於框架16內之光學構件。進而，背光單元20具備光源單元30。光源單元30係沿導光板LG之一側面(入射面)EF而設置，且向該導光板LG出射光。 導光板LG係將具有透光性之極薄之樹脂片形成為矩形狀而成，呈長方體狀。導光板LG具備成為出射面之第1主面S1、與該第1主面S1為相反側之第2主面S2、及將第1主面S1與第2主面S2連結之入射面EF。於本實施形態中，將導光板LG之短邊側之一側面設為入射面EF。俯視下，導光板LG具有稍小於框架16之內形尺寸(internal dimensions)且稍大於液晶顯示面板12之顯示區域DA之外形。導光板LG之板厚係與光源單元30對向之一側面(入射面)側之厚度最厚，與該一側面成為正相反側之另一側面側之厚度最薄。於本實施形態中，作為導光板LG之厚度，採用使該另一側面之厚度為例如0.2～0.5 mm(200～500 μm)左右者。根據本實施形態，框架16之厚度T1係形成為相較於導光板LG之最薄之部分之厚度更薄。而且，導光板LG之板厚與光學片OS類之厚度之合計，大致等於框架16之厚度T1與第1擴散黏著層24a及第2擴散黏著層24b之厚度T2、T3之合計。即，導光板LG及光學片OS之厚度之合計例如形成為0.36～0.52 mm(360～520 μm)。進而，亦能夠使用板厚為0.2 mm(200 μm)以下之極薄之導光板LG。導光板LG係以第2主面S2與反射片RE對向之狀態重疊載置於反射片RE。導光板LG之入射面EF係與框架16之短邊部16d對向。導光板LG之另一側面係分別空開0.05～0.2 mm(50～200 μm)左右之微小間隙而與框架16之短邊部16c、長邊部16a、16b對向。 光學片OS具有透光性，且重疊載置於導光板LG之第1主面S1。於本實施形態中，作為光學片OS，例如使用由聚對苯二甲酸乙二酯等合成樹脂形成之擴散片OS1及角柱薄片OS2。擴散片OS1及角柱薄片OS2係依序重疊載置於導光板LG之第1主面S1上。俯視下，各光學片OS形成為與導光板LG之寬度相同的寬度及較導光板LG之長度稍短之長度。又，各光學片OS形成為較液晶顯示面板12之顯示區域DA稍大之尺寸。光學片OS之除光源側之側緣以外之至少3個側緣係空開(with a predetermined gap)特定之間隙(0.1～0.5 mm)而與框架16直接對向(facing directly)。而且，光學片OS係隔開微小間隙而與液晶顯示面板12之背面對向。由此，光學片OS與液晶顯示面板12之整個顯示區域DA對向。 如圖3及圖5所示，光源單元30具備細長之帶狀之軟性印刷電路基板(FPC)32、及安裝於該FPC32上之光源。根據本實施形態，作為光源，例如使用將作為點光源之發光二極體(LED)34以特定之間隔排列而成者。複數個LED34之各者具有出射面34a及與出射面34a垂直之安裝面34b。複數個LED34係沿FPC32之長度方向(與框架16之短邊部平行之方向)相互隔開特定之間隔而排列設置。各LED34係以使安裝面34b與FPC32對向之狀態安裝。又，FPC32具有自一側緣延伸出之連接端部32a(參照圖3)。 FPC32之一長邊部係藉由第2擴散黏著層24b而重疊於短邊部16d，另一長邊部位於導光板LG之入射面EF側之端部上。藉此，複數個LED34被配置於框架16之短邊部16d與導光板LG之入射面EF之間。各LED34之出射面34a係與入射面EF對向。於本實施形態中，LED34係配置於短邊部16d之凹部17內。各LED34之高度(厚度)Lh例如較佳為0.4 mm(400 μm)以下，更佳為0.3 mm(300 μm)以下。 再者，作為光源，亦能夠採用作為線光源之螢光管或陰極射線管。或者，作為光源，能夠採用極其緻密地配置有包含有機EL(Electroluminescence，電致發光)之光源的線光源或面光源。 如圖5所示，第4接著劑層、例如雙面膠帶37係遍及光學片OS2之光源側之端部(end)及FPC32之光學片側之端部而貼附上。又，於光源側，最下部之光學片OS1之端部係向較光學片OS2之端部更靠光源側延伸出而貼附於雙面膠帶37。藉此，光學片OS1、OS2藉由雙面膠帶37而接合於FPC32。 進而，如圖3及圖5所示，細長之帶狀之第3接著劑層、例如雙面膠帶36重疊貼附於FPC32上及光學片OS之端部上。 以上述方式構成之背光單元20係與液晶顯示面板12之背面對向而配置，且藉由第2擴散黏著層24b及雙面膠帶36而安裝於液晶顯示面板12之偏光板PL2。 即，框架16之左右長邊部16a、16b係藉由第2擴散黏著層24b而分別貼附於偏光板PL2之長邊側端部。藉此，左右邊部16a、16b成為沿偏光板PL2之長邊之狀態。框架16之上邊部16c藉由第2擴散黏著層24b而貼附於偏光板PL2之短邊側端部。藉此，上邊部16c成為沿偏光板PL2之短邊之狀態。藉此，俯視下，該等3個邊部(three bars)16a、16b、16c位於與液晶顯示面板12之邊框區域ED重疊之位置。而且，該等3個邊部(three bars)16a、16b、16c與偏光板PL2之側面排列於同一平面。 再者，於本實施形態中，於除光源側以外之框架16之3邊，能夠採用使偏光板之端部與液晶顯示面板之端部為同一平面之構成、或使偏光板之端部位於較液晶顯示面板之端部更內側之構成。 安裝於框架16之下邊部16d之FPC32係藉由雙面膠帶36貼附於液晶顯示面板12之第1絕緣基板SUB1之裏面側，而非貼附於偏光板PL2。藉此，下邊部16d及光源單元30位於與液晶顯示面板12之邊框區域ED及蓋板14之遮光層RS重疊之位置。 FPC32經由連接端部32a而連接於FPC22(參照圖2)。藉此，驅動電流經由FPC22及FPC32而通電於LED34。自LED34出射之光自導光板LG之入射面EF入射至導光板LG內並於導光板LG內傳播。該光暫時自第2主面S2出射之後，被反射片RE反射並再次入射至導光板LG內。通過此種光路後，來自LED34之光自第1主面(出射面)S1向液晶顯示面板12側出射。所出射之光藉由光學片OS而擴散後照射至液晶顯示面板12之顯示區域DA。 進而，自導光板LG之除入射面EF以外之側面漏出之光入射至框架16之左右邊部16a、16b及上邊部16c並於框架16內傳播。又，該光自框架16之下表面SF1出射至第1擴散黏著層24a之後被反射片RE反射並再次入射至第1擴散黏著層24a及框架16內。通過此種光路後再次入射至框架16之光被第2擴散黏著層24b擴散，且自該第2擴散黏著層24b向液晶顯示面板12側出射，照射至液晶顯示面板12之周緣部。所謂該周緣部包含邊框區域、邊框區域與顯示區域之交界及其周邊。如此，框架16、第1及第2擴散黏著層24a、24b作為將漏出至導光板LG之周邊之光向液晶顯示面板12側導光之輔助光源部而發揮功能。如上所述，背光單元20能夠使光自導光板LG之第1主面S1整個面、及位於導光板LG之周圍之框架16出射至液晶顯示面板12。因此，例如於自斜向目視液晶顯示面板12之顯示面12a之情形時，亦能夠防止顯示區域DA之周邊部變暗等不良情況。其結果，能夠實現較先前更窄邊框之液晶顯示裝置。即，於除與光源單元30鄰接之邊部以外之其他3個邊部，甚至於能夠將實質上包含框架16之背光單元20之外形作為有效照明區域，從而能夠實現更窄邊框之液晶顯示裝置10。 再者，於上述第1實施形態中，框架16係設為由樹脂片材形成之構成，但並不限定於此，亦能夠使用透明之樹脂模具框架。於該情形時，亦能夠將框架16用作輔助光源。 其次，對具有上述構成之背光單元(背光裝置)20之製造方法之一例進行說明。圖7係概略性地表示製造裝置之一例及全部製造步驟之圖，圖8至圖12係分別概略性地表示各製造步驟中之片材之狀態之立體圖。 如圖7所示，製造裝置具備分別捲繞長條之片狀材料之複數個輥RP、RA1、RA2a、RA2b、RS1、RS2、RR、對自該等輥引出之片材沿搬送路徑CP搬送之一對第1搬送輥80a、80b、一對第2搬送輥82a、82b、將隔片捲取回收之回收輥RC、將在搬送路徑CP上移動之片材沖裁加工之第1沖裁加工機P1、及第2沖裁加工機P2等。 複數個輥包含捲繞用以形成框架之片材之輥，例如捲繞PET片材50之輥RP、捲繞第1擴散黏著層之輥RA1、分別捲繞第2擴散黏著層之輥RA2a、RA2b、分別捲繞隔片之輥RS1、RS2。於本實施形態中，作為第1擴散黏著層、第2擴散黏著層，僅使用擴散黏著層，或使用基材＋黏著劑。再者，亦可使用雙面膠帶作為擴散黏著層。又，各輥之寬度與背光單元之短邊間之尺寸相等。僅輥RA2b具有稍小於其他輥之寬度。 如圖7所示，首先，將自輥RP、RA1、RA2a、RA2b、RS1、RS2引出之片材例如PET片材50、第1擴散黏著層24a、第2擴散黏著層24b1、第2擴散黏著層24b2、隔片藉由通過一對搬送輥80a、80b間搬送而相互積層及貼附。即，如圖8及圖9所示，於PET片材50之下表面(第1面)整個面貼附第1擴散黏著層24a。又，於PET片材50之上表面(第2面)，於其整個面貼附第2擴散黏著層24b1，進而，於該第2擴散黏著層24b1之上，於除沿一側部之特定區域以外之區域貼附第2擴散黏著層24b2。利用隔片覆蓋該等第1擴散黏著層24a及第2擴散黏著層24b2之與黏附於PET片材50之面為相反側之面。 其次，如圖7及圖10所示，藉由第1沖裁加工機(模具等)P1，對第1擴散黏著層24a、片材50、第2擴散黏著層24b1、24b2及隔片一同進行沖裁，而依序形成與框架之內形(內孔)相當之矩形狀之內孔52a、52b。繼而，將第1擴散黏著層24a上之隔片剝離，並利用回收輥RC捲取而回收。於該狀態下，如圖7及圖11所示，將自輥RR引出之反射片RE貼附於第1擴散黏著層24a之整個面。該等片材50、擴散黏著層、反射片RE通過一對搬送輥82a、82b間沿搬送路徑CP搬送。 其後，如圖7及圖12所示，利用第2沖裁加工機(模具等)P2，對第1擴散黏著層24a、片材50、第2擴散黏著層24b1、24b2、第2擴散黏著層24b2上之隔片、反射片RE一同進行沖裁，而一次形成框架16、反射片RE、各擴散黏著層24b1、24b2之外形。藉此，依序製作設置有反射片RE及各擴散黏著層24b1、24b2之框架16。繼而，如圖7所示，將導光板LG、光學片OS、光源單元30安裝並固定於所形成之框架16，藉此，獲得背光單元20。再者，導光板LG、光學片OS、光源單元30亦可預先藉由利用擴散黏著層、例如雙面膠帶相互接合而單元化。 根據本實施形態，對厚度0.4 mm(400 μm)以下、例如厚度0.15～0.25 mm(150～255 μm)之較薄之片材進行沖裁而形成背光之框架16。藉此，獲得難以藉由利用射出成型之模具製成之較薄且邊部之寬度較小之框架16。藉由使用該框架16，而能夠低價地實現更薄型且窄邊框之背光裝置及液晶顯示裝置。例如，能夠將框架16之厚度設為0.2 mm以下，將邊部之寬度設為0.45 mm以下，從而能夠容易實現薄型且窄邊框化。進而，藉由框架16變薄，而能夠使用板厚為0.2 mm以下之極薄之導光板，從而獲得更薄型之背光裝置。 又，藉由一次性地對片材、片材上之擴散黏著層24a、24b及反射片RE與框架16進行沖裁加工，而能夠使擴散黏著層24a、24b之寬度、反射片RE之外形尺寸與框架16高精度地一致。 作為比較例而研究如下構成，即，首先以單體形式形成框架，其後，對該框架後附上或後塗佈擴散黏著層。於比較例之情形時，若框架之各邊部之寬度形成得非常窄，則難以將擴散黏著層設置於各邊部之上下表面，擴散黏著層自各邊部溢出。該溢出之黏著劑不僅會對後續步驟造成不良影響，而且若附著於背光裝置之其他構成，則亦會導致背光裝置之發光性能降低。相對於此，於本實施形態之背光裝置中，使擴散黏著層24a、24b之寬度與框架16之邊部之寬度一致，且使擴散黏著層24a、24b之側面(側緣)與框架16之側面(側緣)對齊為同一平面。結果，於本實施形態中，使背光裝置之尺寸精度提昇。進而，藉由所謂之捲對捲製法使片材50、擴散黏著層24a、24b及反射片RE一體化後，對該等一次性地進行沖裁加工。藉由該製法，而實現製造步驟之簡化及大量生產。又，各構件之精度提昇，進而，縮減分別形成該等時所需之各構件間之公差。其結果，本實施形態可有助於薄型化及窄邊框化。 其次，對其他實施形態或變化例之液晶顯示裝置及背光裝置進行說明。再者，於以下說明之其他實施形態及變化例中，對與上述第1實施形態相同之部分，標附相同之參照符號並省略或簡化其詳細之說明，以與第1實施形態不同之部分為中心進行詳細說明。 (第2實施形態) 圖13係第2實施形態之液晶顯示裝置之橫剖視圖，圖14係第2實施形態之液晶顯示裝置之縱剖視圖。 如圖13及圖14所示，根據本實施形態，於液晶顯示裝置10中，背光單元20之光學片OS係經由第2擴散黏著層24b而貼附於框架16之第2面SF2。光學片OS係空開間隙而與導光板LG對向。光學片OS包含擴散片OS1及角柱薄片OS2，該擴散片OS1係經由第2擴散黏著層24b而貼附於框架16之上表面SF2，該角柱薄片OS2係重疊配置於該擴散片OS1上。又，角柱薄片OS2抵接於液晶顯示面板12之偏光板PL2、即面接觸於偏光板PL2之整個面。再者，偏光板PL2係藉由含有微小珠粒之擴散黏著層40而貼附於第2基板SUB2之背面。 於框架16之左右邊部16a、16b及上邊部16c，框架16之外側面與擴散片OS及角柱薄片OS2之側面成為同一平面。進而，於該等3個邊部16a、16b、16c，外側面與液晶顯示面板12之偏光板PL2之側面及第1及第2絕緣基板SUB1、SUB2之側面排列於同一平面。左右邊部16a、16b之寬度W1及上邊部16c之寬度W2分別與液晶顯示面板12之邊框區域ED之寬度一致。藉此，該等3個邊部16a、16b、16c俯視下與液晶顯示面板12之邊框區域ED重疊。 再者，擴散片OS1之凹凸被第2擴散黏著層24b填埋，於擴散片OS1與第2擴散黏著層24b之界面折射率之差較小，於界面上之光擴散降低。然而，藉由第2擴散黏著層24b之光擴散性，而能夠使來自框架16之光向光學片OS良好地出射。 根據以上述方式構成之第2實施形態，無需考慮框架與光學片之間之公差。其結果，能夠將作為光源發揮功能之框架16配置於相對於液晶顯示面板12更內側、即較上述第1實施形態更靠近有效顯示區域DA之位置。藉此，能夠實現液晶顯示裝置之更窄邊框化。又，即便於使擴散片及角柱薄片與液晶顯示面板12之偏光板PL2一體化之情形時，亦能夠藉由使偏光板PL2與液晶顯示面板12之第2絕緣基板SUB2之間之擴散黏著層40具有光擴散功能，而抵消擴散片OS1之擴散功能降低，從而使自蓋板14側視認時之顯示不均降低。擴散黏著層40係藉由設為不自偏光板PL2溢出之尺寸而防止無用光之折入。此外，於第2實施形態中，亦能夠獲得與上述第1實施形態相同之作用效果。 (第3實施形態) 圖15係第3實施形態之液晶顯示裝置之橫剖視圖，圖16係第3實施形態之液晶顯示裝置之縱剖視圖。 如圖15及圖16所示，根據本實施形態，作為光源發揮功能之框架16係進入至相對於液晶顯示面板12更內側為止，即進入至有效顯示區域DA側為止而配置。框架16之一對長邊部16a、16b及與光源單元30為相反側之短邊部16c，於液晶顯示面板12之厚度方向位於與液晶顯示面板12之邊框區域(非顯示區域)ED重疊之位置，並且至少一部分、此處係與導光板LG對向之內側緣部位於與有效顯示區域DA重疊之位置。 於第3實施形態中，液晶顯示裝置10之其他構成與上述第2實施形態之液晶顯示裝置10相同。 根據以上述方式構成之第3實施形態，藉由使用作為光源發揮功能之框架16，而能夠相對於液晶顯示面板12將該框架16配置於較與有效顯示區域DA重疊之位置更內側。藉此，能夠實現液晶顯示裝置之更窄邊框化。進而，由於框架16與有效顯示區域DA亦可重疊設置，故於製造液晶顯示裝置時，能夠於某種程度上容許背光單元20之向液晶顯示面板12之貼附偏移。藉此，能夠提昇液晶顯示裝置之組裝性或製造性。此外，於第3實施形態中，亦能夠獲得與上述第1實施形態相同之作用效果。 (第4實施形態) 圖17係第4實施形態之液晶顯示裝置之橫剖視圖，圖18係第4實施形態之液晶顯示裝置之縱剖視圖。 如圖17及圖18所示，根據本實施形態，背光單元20之反射片RE具有向較框架16之外周緣更外側延伸出之複數個延伸端部REE。該等延伸端部REE向蓋板14側折彎，且貼附於框架16之外側面及液晶顯示面板12之外側面。於本實施形態中，於框架16之一對長邊部16a、16b及短邊部16c，利用反射片RE之延伸端部REE覆蓋框架16之外側面、第1及第2擴散黏著層24a、24b之外側面以及液晶顯示面板12之外側面。藉此，能夠將自框架16之外側面、第1及第2擴散黏著層24a、24b之側面以及光學片OS之側面漏出之光於反射片RE之延伸端部REE反射並使之返回至框架16內及第1、第2擴散黏著層24a、24b內，且向液晶顯示面板12側照射。藉此，能夠提昇背光單元20之光利用效率。 再者，於第4實施形態中，液晶顯示裝置10之其他構成與上述第2實施形態或第3實施形態相同。 (第5實施形態) 圖19係表示第5實施形態之液晶顯示裝置之立體圖，圖20係沿圖19之線C-C之液晶顯示裝置之剖視圖。 由於本實施形態之液晶顯示裝置極薄，故亦能夠使液晶顯示裝置之至少一部分向面外方向彎曲。如圖19及圖20所示，於第5實施形態中，液晶顯示裝置10之長邊側之兩端部構成向下方、即向背光裝置20側彎曲之彎曲部CA。 於一例中，蓋板14之長邊側兩端部係預先向背光裝置20側彎曲而成形。而且，包含偏光板PL1、PL2之液晶顯示面板12係藉由包含光學用透明樹脂之黏著片AD而貼附於蓋板14。藉此，液晶顯示面板12之長邊側之兩端部沿蓋板14彎曲。於本實施形態中，液晶顯示面板12之長邊側之兩端部延伸出至與蓋板14之長邊側之兩端緣成為同一平面之位置。彎曲部CA之彎曲程度、例如曲率半徑能夠任意調整。 於背光單元20中，光學片(擴散片)OS1係載置於導光板LG上且配置於框架16之內側。光學片(角柱薄片)OS2載置於光學片OS1上，又，光學片OS2之周緣部係經由第2擴散黏著層24b而貼附於框架16之第2面SF2。於本實施形態中，光學片OS2之尺寸形成為稍小於框架16之外形尺寸。藉此，光學片OS2之長邊側之側緣位於較框架16之長邊部16a、16b之外側緣更內側。 背光單元20係與液晶顯示面板12之平坦部對向而設置。導光板LG及光學片OS1與液晶顯示面板12之顯示區域DA對向。光學片OS2之周緣部、即與框架16重疊之部分係藉由透明之擴散黏著層40而貼附於偏光板PL2。藉此，背光單元20貼附於液晶顯示面板12。擴散黏著層40含有微小珠粒，且具有光擴散性。又，擴散黏著層40係於偏向板PL2遍及自與框架16對向之位置至與密封材料SE之內緣對向之位置為止之位置而設置於偏光板PL2之表面。 蓋板14及液晶顯示面板12之彎曲部CA超過框架16之長邊側之兩側緣向外側延伸出，覆蓋框架16之外側面16f，並且與該外側面16f傾斜對向。又，背光單元20形成為平板狀，未突出至彎曲部CA。於該狀態下安裝背光單元20，由此，框架16之外側面與彎曲部CA對向。 根據以上述方式構成之第5實施形態，藉由使液晶顯示面板12之長邊側之兩端部彎曲而形成彎曲部CA，能夠實現面板設計之多樣化，並且能夠實現液晶顯示裝置之使用範圍之擴大。又，藉由使液晶顯示面板12之兩側緣部超過框架16延伸至蓋板14之側緣為止，而能夠使液晶顯示面板12之有效顯示區域DA相應地擴大區域DA2之量。即，根據本實施形態，能夠使位於導光板LG之周圍之框架16作為向液晶顯示面板12側照射光之輔助光源部發揮功能，因此，能夠自框架對位於導光板LG之外側之顯示區域DA2亦照射光。因此，能夠將顯示區域DA2用作有效顯示區域而顯示圖像。如此，於液晶顯示面板12之長邊側之兩側緣部，直至於能夠將實質上包含框架16之背光單元20之外側作為有效照明區域，從而能夠實現進而更窄邊框之液晶顯示裝置10。 此外，於第5實施形態中，亦能夠獲得與上述第1實施形態相同之作用效果。再者，於第5實施形態中，彎曲部並不限於長邊側之兩側部，亦可設為使液晶顯示裝置整體彎曲之構成。 (第1變化例) 圖21係表示第1變化例之液晶顯示裝置之一部分之剖視圖。 於上述第5實施形態中，亦可設為使框架16為寬幅且使框架16之一部分沿液晶顯示面板12彎曲之構成。 如圖21所示，於第1變化例中，框架16之長邊部16a、16b分別形成為寬幅，且自導光板LG之側面附近延伸至液晶顯示面板12之密封材料SE之內緣附近。反射片RE之端部藉由第1擴散黏著層24a而貼附於框架16之下表面SF1，且覆蓋框架16之下表面SF1。光學片(角柱薄片)OS2之端部藉由第2擴散黏著層24b而貼附於框架16之上表面SF2，且覆蓋框架16之上表面SF2。於本變化例中，反射片RE之側面及光學片OS2之側面與框架16之外側面成為同一平面。 上述框架16及光學片OS2之周緣部係藉由具有光擴散性之擴散黏著層40而貼附於液晶顯示面板12之偏光板PL2。藉此，框架16、反射片RE之周緣部、光學片OS2之周緣部沿液晶顯示面板12彎曲，且與液晶顯示面板12之彎曲部CA及顯示區域DA2對向。根據第1變化例，藉由將作為輔助光源發揮功能之框架16遍及彎曲部CA及顯示區域DA2之整個區域而設置，而能夠對顯示區域DA2照射更多之光。又，即便於該情形時，框架16亦作為輔助光源發揮功能，因此，不會妨礙液晶顯示裝置之窄邊框化。又，對顯示區域DA2照射來自輔助光源之光，因此認為亮度相較於顯示區域DA稍微降低。另一方面，設定將包含彎曲部CA之顯示區域DA2用於以顯示區域DA為主視窗之情形時之輔助視窗之輔助性用途。於將顯示區域DA2用作此種輔助性用途之情形時，即便為相較於顯示區域DA亮度降低之狀態，亦能夠有效地使用。 (第2變化例) 圖22係表示第2變化例之液晶顯示裝置之一部分之剖視圖。 於本變化例中，僅光學片OS2之周緣部延伸至液晶顯示面板12之密封材料SE之附近，且藉由擴散黏著層40而貼附於偏光板PL2。框架16之長邊部16a、16b、第1擴散黏著層24a、第2擴散黏著層24b及反射片RE之周緣部形成為稍短於光學片OS2，且延伸至密封材料SE之近前為止。 即便於此種構成中，亦能夠藉由光學片OS2及擴散黏著層40將自框架16出射之光擴散並照射至整個顯示區域DA2。又，由於能夠使背光單元20之寬度較小，故有助於液晶顯示裝置整體之小型化。 雖然已描述了某些實施例及變形例，但這些實施例及變形例僅以實例方式呈現，且並非旨在限制本發明的範圍。實際上，本文所述之新穎方法及系統可以多種其他形式實施，此外，在不背離本發明之精神下，可對本文所述之方法及系統的形式作出各種省略、取代及改變。意欲隨附申請專利範圍及其相等物涵蓋該等形式或修改，如同屬於本發明之範疇及精神一般。 業者基於作為本發明之實施形態之上述各構成及製造步驟適當進行設計變更而可實施之全部構成及製造步驟，只要包含本發明之要旨則亦屬於本發明之範圍。例如，亦能夠採用如下構成，即，不先將液晶顯示面板安裝於蓋板，而於收容於收容有背光單元之收容殼體內後，與收容殼體之凸緣一起安裝於蓋板。又，亦能夠採用如下構成，即，液晶顯示面板亦不與蓋板接著而能夠於收容殼體內稍微移動。進而，亦能夠採用將液晶顯示面板固定於背光單元並將該等相互固定之背光單元及液晶顯示面板收容於收容殼體之構成。 又，對於藉由上述實施形態帶來之其他作用效果，根據本說明書之記載可知者或業者能夠適當聯想到者當然可理解為藉由本發明帶來者。 背光單元之光學片並不限於2片，亦可視需要而增減。液晶顯示面板、背光單元之構成構件、及框架之外形狀及內形狀並不限定於矩形狀，亦可使外形或內徑之任一者或兩者為俯視下多邊形狀或圓形、橢圓形及使該等組合而成之形狀等其他形狀。構成構件之材料並不限於上述例，能夠進行各種選擇。Various embodiments will be described below with reference to the accompanying drawings. In addition, the disclosure is merely an example, and it is of course included in the scope of the present invention that an operator makes appropriate changes to ensure the gist of the invention and can easily associate it. In addition, in order to make the description clearer, the width, thickness, shape, and the like of each part may be schematically shown in comparison with the actual state, but this is only an example and is not intended to limit the interpreter of the present invention. In addition, in this specification and the drawings, the same reference numerals are assigned to the same elements as those described in the already existing drawings, and detailed explanations are appropriately omitted. (First Embodiment) FIGS. 1 and 2 are perspective views showing a display surface side and a back surface side of a liquid crystal display device according to a first embodiment, respectively, and FIG. 3 is an exploded perspective view of the liquid crystal display device. The liquid crystal display device 10 can be incorporated in various electronic devices such as a smartphone, a tablet terminal, a mobile phone, a notebook PC (personal computer), a portable game machine, an electronic dictionary, a video device, and a car navigation system. As shown in FIGS. 1 to 3, the liquid crystal display device 10 includes an active matrix flat liquid crystal display panel 12 (liquid crystal display panel (LCD panel)), and a cover plate 14 which is disposed on the liquid crystal display panel 12 in an overlapping manner. A display surface 12a of one flat plate surface covers the entire display surface; and a backlight unit (backlight device) 20 is disposed to face the back side of the other flat plate surface of the liquid crystal display panel 12. FIG. 4 is a cross-sectional view of the liquid crystal display device along the line A-A of FIG. 1, and FIG. 5 is a cross-sectional view of the liquid crystal display device along the line B-B of FIG. As shown in FIG. 3 to FIG. 5, the liquid crystal display panel 12 includes a rectangular flat plate-shaped first substrate SUB1, a rectangular flat plate-shaped second substrate SUB2 disposed opposite to the first substrate SUB1, and provided on the first substrate SUB1 and the first substrate SUB1. The liquid crystal layer LQ between the two substrates SUB2. The peripheral edge portion of the second substrate SUB2 is bonded to the first substrate SUB1 with a sealing material SE. A polarizing plate PL1 is attached to the surface of the second substrate SUB2 to form a display surface 12 a of the liquid crystal display panel 12. A polarizing plate PL2 is attached to the surface of the first substrate SUB1 (the back surface of the liquid crystal display panel 12). In a plan view, the polarizing plate PL2 has a size slightly larger than the outer dimension of the first substrate SUB1 and covers the entire surface of the first substrate SUB1. It should be noted that the plan view refers to a state in which the liquid crystal display panel is viewed from a normal direction of a surface of the liquid crystal display panel. In the liquid crystal display panel 12, a display area (working area) DA is provided in a region that becomes the inside of the sealing material SE in a state where the display surface 12a is viewed in plan. An image is displayed in this display area DA. A frame area (non-display area) ED is provided around the display area DA. The display area is rectangular, and the border area is rectangular. The liquid crystal display panel 12 is a transmissive type in which an image is displayed by selectively transmitting light from the backlight unit 20 to the display area DA. The liquid crystal display panel 12 can adopt various display modes. For example, it may have a structure corresponding to a transverse electric field mode or a structure corresponding to a longitudinal electric field mode. The transverse electric field mode mainly uses an electric field substantially parallel to the main surface of the substrate, and the longitudinal electric field mode mainly uses approximately An electric field perpendicular to the main surface of the substrate. In the example shown in the figure, a flexible printed circuit board (FPC, Flexible Print Circuit) 22 is bonded to an end portion of the short side of the first substrate SUB1. The flexible printed circuit board 22 extends outward from the liquid crystal display panel 12. A semiconductor element such as a driver IC (integrated circuit) chip 21 is mounted on the FPC 22 as a signal supply source for supplying a signal required to drive the liquid crystal display panel 12. As shown in FIGS. 1 to 5, the cover plate 14 is formed in a rectangular flat plate shape, for example, from a glass plate or an acrylic transparent resin. The cover plate 14 has a width and a length that are larger than the size (width, length) of the liquid crystal display panel 12. Thereby, the cover plate 14 has a larger area than the liquid crystal display panel 12 in a plan view. A frame-shaped light-shielding layer RS is formed on a peripheral portion of the back surface of the cover plate 14 (the surface on the liquid crystal display panel 12 side or the surface opposite to the side facing the viewer). In the cover plate 14, areas other than the area facing the display area DA are blocked by the light shielding layer RS. The light shielding layer RS may be formed on the upper surface (display surface) of the cover plate 14. The back surface (inside) of the cover plate 14 is attached to the polarizing plate PL1 with a translucent or transparent adhesive or adhesive, for example, an adhesive sheet AD containing a transparent resin for optics. Thereby, the cover plate 14 covers the entire surface of the display surface 12 a of the liquid crystal display panel 12 and covers it. In addition, the adhesive sheet AD is formed in the same size as the polarizing plate PL1 and is neatly attached to the polarizing plate PL1. In addition, instead of the adhesive sheet AD, a configuration in which an adhesive is applied to the polarizing plate PL1 and its periphery can also be adopted. The peripheral portion of the cover plate 14 protrudes further outward than the outer periphery of the liquid crystal display panel 12. The long side of the cover plate 14 and the long side of the liquid crystal display panel 12 are separated from each other with a prescribed gap, and are in a substantially parallel state. The short side of the cover plate 14 and the short side of the liquid crystal display panel 12 are spaced apart from each other by a specific interval, and become substantially parallel. In this embodiment, the distance between the long side of the cover plate 14 and the long side of the liquid crystal display panel 12, that is, the width of the peripheral edge portion of the long side of the cover plate 14 is formed smaller than the short side of the cover plate 14 and the liquid crystal display panel 12. The interval between the short sides is the width of the peripheral edge of the short side of the cover. In addition, the cover plate and the liquid crystal display panel may have a configuration in which corner portions are rounded. In this case, it is not necessary to make all corners round, and a configuration in which only one or two corners are rounded can be adopted. In addition, both a configuration in which the corner portion of any one of the cover plate and the liquid crystal display panel is rounded, and a configuration in which each of the corner portions is rounded may be adopted. As shown in FIGS. 3 to 5, the backlight unit 20 includes a rectangular frame 16 attached to the back of the liquid crystal display panel 12, a reflective sheet RE attached to the back of the frame 16, and a plurality of optical members. These are arranged in the frame 16 and a light source unit 30 that supplies light incident on the optical member. The frame 16 has a thickness T1 of 0. 40 mm (400 μm) or less, such as 0. 10 to 0. 25 mm (100-255 μm) sheet material. In plan view, the outer shape of the frame 16 is slightly larger than the outer shape of the liquid crystal display panel 12 and smaller than the outer shape of the cover plate 14. As the sheet, a translucent or transparent resin sheet such as a sheet of polyethylene terephthalate (PET) can be used. The resin sheet used here includes a sheet having a thickness of about 100 to 300 μm, a film and a film having a thickness of less than 100 μm, and the like. As described below, the frame 16 is formed by punching a resin sheet and has a specific size. In addition, the frame 16 is formed to have a uniform thickness T1 throughout the entire circumference, and has no unevenness in the thickness direction (the Z direction when viewed in cross section). In this embodiment, the thickness of the frame 16 (thickness of the sheet) T1 is set to 0. 188 mm (188 μm) or 0. 25 mm (250 μm). The frame 16 has a first surface SF1 and a second surface SF2. The second surface SF2 is the upper surface facing the liquid crystal display panel 12, and the first surface SF1 is the lower surface that is opposite to the second surface SF2. The frame 16 has a pair of longwise bars 16a, 16b facing each other, and a pair of sidelong bar 16c, 16d facing each other. The width W1 of each long side portion 16a, 16b is formed to 0. 6 mm (600 μm) or less, such as 0. 4 to 0. 5 mm (400-500 μm). The width W2 of a short side portion 16c is formed to be the same as the width W1. 6 mm (600 μm) or less, such as 0. 4 to 0. 5 mm (400-500 μm). Also, the width W3 of the other short side portion 16d is formed to be the same as the width W2. 6 mm (600 μm) or less, such as 0. 4 to 0. 5 mm (400-500 μm). Furthermore, the width W3 of the short side portion 16d may be formed wider than W2. Further, a plurality of recessed portions 17 are provided on the inner edge side of the other short side portion 16d. In addition, hereinafter, one short side portion may be referred to as an upper side portion (upside bar), and the other short side portion may be referred to as a lower side portion (downside bar). In addition, a pair of long side portions may be referred to as right-and-left bars. In addition, the left and right side portions and the upper side portion may be collectively referred to as three side portions other than the lower side portion. A first diffusion adhesive layer 24a is formed on the lower surface (first surface) SF1 of the frame 16. A second diffusion adhesive layer 24b is formed on the upper surface (second surface) SF2 of the frame 16. As shown in FIG. 4, the first diffusion adhesive layer 24 a and the second diffusion adhesive layer 24 b are each formed by mixing a plurality of minute beads B having a refractive index different from the adhesive in a transparent binder. A light-diffusing adhesive is formed. As the adhesive, for example, an adhesive containing acrylic resin, polystyrene, polyester, epoxy resin, vinyl polymer, or the like, a UV (ultraviolet) curing adhesive, or the like can be used. As the microbeads B, light-transmitting hollow silica particles, glass particles, or particles made of synthetic resin can be used. In addition, as a transparent material forming minute beads, acrylic resins such as polymethyl methacrylate, polyethylene terephthalate, and polybutylene terephthalate are used by electromagnetic radiation such as ultraviolet rays or electron beams. Polyester resins such as esters, thermoplastic resins such as polystyrene resins, polycarbonate resins, polymethylpentene resins, polyacrylates, acrylic urethanes, epoxy acrylates, etc. contain oligomers and / or acrylic acid Ester monomers, such as resins which are cured by free radiation-curable resins, and have good transparency. Moreover, glass, ceramics, etc. may be sufficient as long as it is transparent other than resin. The light diffusivity of the diffusion adhesive layer can be appropriately adjusted by adjusting the content of the microbeads B, the refractive index of the microbeads B, and the like. In this embodiment, the light diffusion property da of the first diffusion adhesive layer 24a is greater than the light diffusion property db of the second diffusion adhesive layer 24b. Here, the light diffusivity db is the light diffusivity of the entire second diffusion adhesive layer 24b provided on the long side portions 16a, 16b and the short side portion 16c, regardless of how many layers the second diffusion adhesive layer 24b is made of. The thickness T2 of the first diffusion adhesive layer 24a is, for example, 0. 01 ～ 0. 06 mm (10 to 60 μm), the thickness T3 of the second diffusion adhesive layer 24b of the long side portions 16a, 16b and the upper side portion 16c is formed to 0. 01 ～ 0. 06 mm (10-60 μm). Thus, the total thickness of the frame 16, the first diffusion adhesive layer 24a, and the second diffusion adhesive layer 24b, for example, is formed at the side of the long side portions 16a, 16b and the upper side portion 16c which becomes the maximum thickness to be 0. 32 ～ 0. 52 mm (320-520 μm). On the pair of long side portions 16a and 16b, each of the first diffusion adhesive layer 24a and the second diffusion adhesive layer 24b has the same width as the width W1 of the long side portions 16a and 16b, and at least the outer surface of the frame 16 (external surface ) Is the same plane as the external surface of the first diffusion adhesive layer 24a and the external surface of the second diffusion adhesive layer 24b. In this embodiment, the internal surface side of the first diffusion adhesive layer 24 a and the internal surface side of the second diffusion adhesive layer 24 b are also on the same plane as the internal surface of the frame 16. Alternatively, when viewed between the long side portions 16a and 16b of the frame 16, the internal dimension between the long side portions 16a and 16b and the first diffusion adhesive layer provided on each of the long side portions 16a and 16b. The internal dimension between 24a and the internal dimension between the second diffusion adhesive layers 24b are equal. Similarly, the external dimensions between the long side portions 16a and 16b and the external dimensions between the first diffusion adhesive layer 24a and the external dimensions between the second diffusion adhesive layer 24b provided in each of the long side portions 16a and 16b ( external dimension). In this embodiment, each of the short side portions 16c and 16d of the frame 16 and the first diffusion adhesive layer 24a and the second diffusion adhesive layer 24b also have the same width as the widths W2 and W3 of the short side portions 16c and 16d. The outer surface and the inner surface of the frame 16 and the first diffusion adhesive layer 24a are respectively the same plane. The outer surface and the inner surface of the frame 16 and the second diffusion adhesive layer 24b are the same plane, respectively. Alternatively, when viewed between the short side portions 16c and 16d of the frame 16, the internal dimensions between the short side portions 16c and 16d and the inside of the first diffusion adhesive layer 24a provided between the short side portions 16c and 16d. The dimensions are the same as the internal dimensions between the second diffusion adhesive layers 24b. Similarly, the outer dimensions of the short side portions 16c and 16d are equal to the outer dimensions between the first diffusion adhesive layers 24a and the outer dimensions between the second diffusion adhesive layers 24b provided in the respective short side portions 16c and 16d. In this embodiment, as the first diffusion adhesive layer 24a and the second diffusion adhesive layer 24b, a double-sided tape having an adhesive layer on both sides of a light-transmitting substrate is used. The thickness of each adhesive layer can be easily adjusted by changing the thickness of each substrate. In addition, the second diffusion adhesive layer 24b on the three side portions 16a, 16b, and 16c other than the lower edge portion is formed to be thicker than the second diffusion adhesive layer 24b on the lower edge portion 16d, for example, to have a thickness of about twice. In this case, the second diffusion adhesive layer 24b on the three side portions 16a, 16b, and 16c can be formed by using two layers of adhesive laminated layers having the same thickness as the second diffusion adhesive layer 24b on the lower side portion 16d. In addition, the second diffusion adhesive layer 24b on the lower side portion 16d is thinner than the second diffusion adhesive layer 24b on the long side portions 16a and 16b to form a printed circuit board 32 for passing through the light source unit 30 described below. The gap. In addition, as shown schematically in FIG. 6A, the light diffusivity of the portion provided on the upper side portion 16c in the first diffusion adhesive layer 24a may be compared with that of the portions provided on the left and right side portions 16a and 16b. The content of the microbeads B is adjusted so that the diffusivity becomes low. Similarly, the microbeads B can be adjusted so that the diffusivity of the portion provided on the upper side portion 16c in the second diffusion adhesive layer 24b is lower than that of the portions provided on the left and right side portions 16a and 16b. Of content. In addition, as shown schematically in FIG. 6B, the light diffusion of the first diffusion adhesive layer 24a provided on the left and right side portions 16a and 16b may be adjusted to gradually increase from the lower side portion 16d to the upper side portion 16c. Content of bead B. Similarly, the content of the microbeads can be adjusted such that the light diffusivity of the second diffusion adhesive layer 24b provided on the left and right side portions 16a and 16b gradually increases from the lower side portion 16d to the upper side portion 16c. In addition, a structure combining the structure shown in FIG. 6A and the structure shown in FIG. 6B may be adopted, that is, the light diffusion properties of the first diffusion adhesive layer 24a and the second diffusion adhesive layer 24b of the upper edge portion 16c may be compared. The adjustment is performed so that the light diffusivity is lowered at any of the left and right side portions 16a and 16b. For example, a configuration is adopted in which the light diffusivity at the upper side portion 16c is lower than the light diffusivity at the position closest to the light source of the left and right side portions 16a and 16b. Alternatively, a configuration in which the light diffusivity of the upper side portion 16c is lower than that of the left and right side portions 16a and 16b at a position farthest from the light source is adopted. Further, a configuration is adopted in which the light diffusivity at the central portions in the longitudinal direction of the left and right side portions 16 a and 16 b is the same as that of the upper side portion 16 c. In FIGS. 6A and 6B, the difference in light diffusivity of each diffusion adhesive layer is represented by the number of microbeads B. However, in order to make the light diffusivity different, it is appropriate to change the particle diameter of the microbeads B or A method for changing the light diffusivity by using different materials such as particle size distribution or refractive index and transmittance. In addition, it is also possible to adjust the light transmittance of the frame 16 by performing white dot printing or the like in the frame 16 facing the reflection sheet RE. In this case, the frame 16 can be made transparent to the distance from the light source unit 30 by gradually changing the density of the dots printed from the white point closer to the light source unit 30 and away from the light source unit 30. Light. As shown in FIGS. 3 to 5, the reflection sheet RE is attached to the lower surface SF1 of the frame 16 through the first diffusion adhesive layer 24 a and covers the lower surface side of the frame 16. The reflection sheet RE is a reflection sheet having a film thickness of 200 μm or less, preferably 50 to 90 μm, and a reflectance of 90% or more, and more preferably 95% or more. In addition, the reflection sheet RE is formed so as to have a distance from the frame 16 when viewed from the interval between the long side portions 16 a and 16 b of the frame 16 and from the interval between the short side portions 16 c and 16 d of the frame 16. Rectangular shapes of equal size. In addition, the outer surface of the reflection sheet RE and the outer surface of the frame 16 are aligned on the same plane, but not in a state where one of them projects relative to the other. The backlight unit 20 includes a rectangular light guide plate LG in a plan view and an optical sheet OS superposed on the light guide plate LG as optical members housed in the frame 16. Furthermore, the backlight unit 20 includes a light source unit 30. The light source unit 30 is provided along one side surface (incident surface) EF of the light guide plate LG, and emits light to the light guide plate LG. The light guide plate LG is formed by forming an extremely thin resin sheet having translucency into a rectangular shape, and has a rectangular parallelepiped shape. The light guide plate LG includes a first main surface S1 serving as an emission surface, a second main surface S2 opposite to the first main surface S1, and an incident surface EF connecting the first main surface S1 and the second main surface S2. In this embodiment, one side surface of the short side of the light guide plate LG is set as the incident surface EF. In plan view, the light guide plate LG has an internal shape slightly smaller than the internal dimensions of the frame 16 and slightly larger than the external shape of the display area DA of the liquid crystal display panel 12. The thickness of the light guide plate LG is the thickest on the side (incident surface) side facing the light source unit 30, and the thinnest on the other side side which is directly opposite to the one side surface. In this embodiment, as the thickness of the light guide plate LG, the thickness of the other side is used, for example, 0. 2 to 0. 5 mm (200-500 μm). According to this embodiment, the thickness T1 of the frame 16 is formed to be thinner than the thickness of the thinnest part of the light guide plate LG. The total of the thickness of the light guide plate LG and the thickness of the optical sheet OS is approximately equal to the total of the thickness T1 of the frame 16 and the thicknesses T2 and T3 of the first diffusion adhesive layer 24a and the second diffusion adhesive layer 24b. That is, the total thickness of the light guide plate LG and the optical sheet OS is formed to be, for example, 0. 36 ～ 0. 52 mm (360 ～ 520 μm). Furthermore, it is also possible to use a plate thickness of 0. Ultra-thin light guide plate LG less than 2 mm (200 μm). The light guide plate LG is placed on the reflective sheet RE so that the second main surface S2 and the reflective sheet RE face each other. The incident surface EF of the light guide plate LG is opposed to the short side portion 16 d of the frame 16. The other sides of the light guide plate LG are respectively left open. 05 ～ 0. A small gap of about 2 mm (50 to 200 μm) is opposed to the short side portions 16 c and the long side portions 16 a and 16 b of the frame 16. The optical sheet OS is translucent and is placed on the first main surface S1 of the light guide plate LG in an overlapping manner. In this embodiment, as the optical sheet OS, for example, a diffusion sheet OS1 and a corner sheet OS2 formed of a synthetic resin such as polyethylene terephthalate are used. The diffusion sheet OS1 and the corner pillar sheet OS2 are sequentially stacked on the first main surface S1 of the light guide plate LG. In plan view, each optical sheet OS is formed to have the same width as the width of the light guide plate LG and a length slightly shorter than the length of the light guide plate LG. Each optical sheet OS is formed to have a size slightly larger than the display area DA of the liquid crystal display panel 12. The optical sheet OS has at least 3 side edges other than the light source side edge with a predetermined gap (0. 1 to 0. 5 mm) while facing directly to the frame 16. The optical sheet OS is opposed to the rear surface of the liquid crystal display panel 12 with a small gap. As a result, the optical sheet OS and the entire display area DA of the liquid crystal display panel 12 face each other. As shown in FIGS. 3 and 5, the light source unit 30 includes an elongated strip-shaped flexible printed circuit board (FPC) 32 and a light source mounted on the FPC 32. According to the present embodiment, as the light source, for example, a light emitting diode (LED) 34 as a point light source is arranged at a predetermined interval. Each of the plurality of LEDs 34 has an emission surface 34a and a mounting surface 34b perpendicular to the emission surface 34a. The plurality of LEDs 34 are arranged at a predetermined interval from each other along the length direction of the FPC 32 (the direction parallel to the short side portion of the frame 16). Each LED 34 is mounted in a state where the mounting surface 34 b and the FPC 32 face each other. The FPC 32 has a connection end portion 32a (see FIG. 3) extending from one edge. One of the long side portions of the FPC 32 is overlapped on the short side portion 16d by the second diffusion adhesive layer 24b, and the other long side portion is located on an end portion on the incident surface EF side of the light guide plate LG. Thereby, a plurality of LEDs 34 are arranged between the short side portion 16 d of the frame 16 and the incident surface EF of the light guide plate LG. The emitting surface 34a of each LED 34 faces the incident surface EF. In this embodiment, the LED 34 is arranged in the recessed portion 17 of the short side portion 16d. The height (thickness) Lh of each LED 34 is preferably 0, for example. 4 mm (400 μm) or less, more preferably 0. 3 mm (300 μm) or less. Furthermore, as the light source, a fluorescent tube or a cathode ray tube as a linear light source can also be used. Alternatively, as the light source, a line light source or a surface light source in which a light source including an organic EL (Electroluminescence) light source is extremely densely arranged can be used. As shown in FIG. 5, a fourth adhesive layer, such as a double-sided adhesive tape 37, is attached to the end on the light source side of the optical sheet OS2 and the end on the optical sheet side of the FPC 32. On the light source side, the end portion of the lowermost optical sheet OS1 extends toward the light source side than the end portion of the optical sheet OS2 and is attached to the double-sided tape 37. Thereby, the optical sheets OS1 and OS2 are bonded to the FPC 32 via the double-sided tape 37. Furthermore, as shown in FIG. 3 and FIG. 5, an elongated strip-shaped third adhesive layer, such as a double-sided tape 36, is superimposed on the FPC 32 and the end of the optical sheet OS. The backlight unit 20 configured as described above is disposed to face the back surface of the liquid crystal display panel 12, and is mounted on the polarizing plate PL2 of the liquid crystal display panel 12 through the second diffusion adhesive layer 24 b and the double-sided tape 36. That is, the left and right long side portions 16a, 16b of the frame 16 are respectively attached to the long side side end portions of the polarizing plate PL2 via the second diffusion adhesive layer 24b. Thereby, the left and right side portions 16a and 16b are in a state along the long sides of the polarizing plate PL2. The upper side portion 16c of the frame 16 is attached to the short side side end portion of the polarizing plate PL2 via the second diffusion adhesive layer 24b. Thereby, the upper side part 16c is in the state along the short side of the polarizing plate PL2. As a result, the three bars 16a, 16b, and 16c are located at positions overlapping the frame region ED of the liquid crystal display panel 12 in a plan view. In addition, the three sides 16a, 16b, and 16c are aligned with the side surface of the polarizing plate PL2. Furthermore, in this embodiment, on the three sides of the frame 16 other than the light source side, a configuration can be adopted in which the end of the polarizing plate and the end of the liquid crystal display panel are on the same plane, or the end of the polarizing plate is positioned The structure is more inward than the end portion of the liquid crystal display panel. The FPC 32 mounted on the lower edge portion 16 d of the frame 16 is attached to the inner side of the first insulating substrate SUB1 of the liquid crystal display panel 12 by a double-sided tape 36, instead of being attached to the polarizing plate PL2. As a result, the lower portion 16d and the light source unit 30 are located at positions overlapping the frame region ED of the liquid crystal display panel 12 and the light shielding layer RS of the cover plate 14. The FPC 32 is connected to the FPC 22 via the connection end portion 32 a (see FIG. 2). Thereby, the driving current is supplied to the LED 34 via the FPC22 and the FPC32. The light emitted from the LED 34 enters the light guide plate LG from the incident surface EF of the light guide plate LG and propagates in the light guide plate LG. After this light is temporarily emitted from the second main surface S2, it is reflected by the reflection sheet RE and re-enters the light guide plate LG. After passing through such an optical path, light from the LED 34 is emitted from the first main surface (exit surface) S1 to the liquid crystal display panel 12 side. The emitted light is diffused by the optical sheet OS and irradiates the display area DA of the liquid crystal display panel 12. Furthermore, light leaking from the side surface of the light guide plate LG other than the incident surface EF is incident on the left and right side portions 16 a and 16 b and the upper side portion 16 c of the frame 16 and propagates inside the frame 16. The light exits from the lower surface SF1 of the frame 16 to the first diffusion adhesive layer 24 a, is reflected by the reflection sheet RE, and then enters the first diffusion adhesive layer 24 a and the frame 16 again. The light that is incident on the frame 16 again after passing through such an optical path is diffused by the second diffusion adhesive layer 24b, and exits from the second diffusion adhesive layer 24b to the liquid crystal display panel 12 side, and irradiates the peripheral portion of the liquid crystal display panel 12. The peripheral portion includes a border region, a boundary between the border region and the display region, and a periphery thereof. In this way, the frame 16, the first and second diffusion adhesive layers 24a, 24b function as an auxiliary light source unit that guides light leaking to the periphery of the light guide plate LG to the liquid crystal display panel 12 side to guide light. As described above, the backlight unit 20 can emit light from the entire surface of the first main surface S1 of the light guide plate LG and the frame 16 located around the light guide plate LG to the liquid crystal display panel 12. Therefore, for example, when the display surface 12a of the liquid crystal display panel 12 is viewed from an oblique direction, it is possible to prevent a defect such as the peripheral portion of the display area DA from becoming dark. As a result, a liquid crystal display device with a narrower frame than before can be realized. That is, the three sides other than the side adjacent to the light source unit 30, and even the backlight unit 20 substantially including the frame 16 can be shaped as an effective illumination area, so that a liquid crystal display device with a narrower frame can be realized. 10. In addition, in the above-mentioned first embodiment, the frame 16 is formed of a resin sheet, but it is not limited to this, and a transparent resin mold frame can also be used. In this case, the frame 16 can also be used as an auxiliary light source. Next, an example of a manufacturing method of the backlight unit (backlight device) 20 having the above-mentioned configuration will be described. FIG. 7 is a diagram schematically showing an example of a manufacturing apparatus and all manufacturing steps, and FIGS. 8 to 12 are perspective views schematically showing states of sheets in each manufacturing step, respectively. As shown in FIG. 7, the manufacturing apparatus includes a plurality of rolls RP, RA1, RA2a, RA2b, RS1, RS2, and RR, each of which winds a long sheet-like material, and conveys a sheet drawn from the rolls along a conveying path CP. One pair of first conveying rollers 80a, 80b, one pair of second conveying rollers 82a, 82b, a recovery roller RC for winding up and recovering the separator, and a first punching process of a sheet punching process that moves on the conveying path CP Processing machines P1 and P2, etc. The plurality of rolls include a roll that winds a sheet forming a frame, for example, a roll RP that winds a PET sheet 50, a roll RA1 that winds a first diffusion adhesive layer, a roll RA2a that winds a second diffusion adhesive layer, RA2b, rollers RS1 and RS2 respectively winding the separator. In this embodiment, as the first diffusion adhesive layer and the second diffusion adhesive layer, only a diffusion adhesive layer is used, or a substrate + adhesive is used. Furthermore, a double-sided tape may be used as the diffusion adhesive layer. The width of each roller is equal to the size between the short sides of the backlight unit. Only the roll RA2b has a width slightly smaller than that of the other rolls. As shown in FIG. 7, first, a sheet such as a PET sheet 50, a first diffusion adhesive layer 24a, a second diffusion adhesive layer 24b1, and a second diffusion adhesive are drawn from the rollers RP, RA1, RA2a, RA2b, RS1, and RS2. The layer 24b2 and the separator are laminated and adhered to each other by being conveyed between a pair of conveying rollers 80a and 80b. That is, as shown in FIG. 8 and FIG. 9, the first diffusion adhesive layer 24 a is adhered to the entire lower surface (first surface) of the PET sheet 50. In addition, a second diffusion adhesive layer 24b1 is attached to the entire surface (second surface) of the PET sheet 50, and further, the second diffusion adhesive layer 24b1 is applied to the second diffusion adhesive layer 24b1 on the entire surface of the PET sheet 50. The second diffusion adhesive layer 24b2 is attached to a region other than the region. The surfaces of the first diffusion adhesive layer 24a and the second diffusion adhesive layer 24b2 covered with the separator are opposite to the surface adhered to the PET sheet 50. Next, as shown in FIGS. 7 and 10, the first diffusion adhesive layer 24a, the sheet 50, the second diffusion adhesive layers 24b1, 24b2, and the spacer are performed together by the first punching machine (die, etc.) P1. Blanking is performed in order to form rectangular inner holes 52a, 52b corresponding to the inner shape (inner hole) of the frame. Then, the separator on the first diffusion adhesive layer 24a was peeled off, and it was wound up by a recovery roll RC and recovered. In this state, as shown in FIGS. 7 and 11, the reflection sheet RE drawn from the roller RR is attached to the entire surface of the first diffusion adhesive layer 24 a. The sheet 50, the diffusion adhesive layer, and the reflection sheet RE are transported along a transport path CP between a pair of transport rollers 82a and 82b. Thereafter, as shown in FIG. 7 and FIG. 12, the second diffusion adhesive layer 24a, the sheet 50, the second diffusion adhesive layers 24b1, 24b2, and the second diffusion adhesive are applied to the second diffusion adhesive layer 24a, the sheet 50, and the second diffusion processing machine (die, etc.) P2. The spacer and the reflection sheet RE on the layer 24b2 are punched out together, and the frame 16, the reflection sheet RE, and each of the diffusion adhesive layers 24b1 and 24b2 are formed at one time. Thereby, the frame 16 provided with the reflection sheet RE and each of the diffusion adhesive layers 24b1 and 24b2 is sequentially manufactured. Then, as shown in FIG. 7, the light guide plate LG, the optical sheet OS, and the light source unit 30 are mounted and fixed to the formed frame 16, thereby obtaining a backlight unit 20. In addition, the light guide plate LG, the optical sheet OS, and the light source unit 30 may be unitized in advance by being bonded to each other using a diffusion adhesive layer, such as a double-sided tape. According to this embodiment, the thickness is 0. 4 mm (400 μm) or less, e.g. thickness 0. 15 to 0. A thinner sheet of 25 mm (150-255 μm) is punched to form a frame 16 for the backlight. As a result, a frame 16 that is difficult to make by using a mold for injection molding and has a small width at the side is obtained. By using the frame 16, a thinner and narrower frame backlight device and a liquid crystal display device can be realized at low cost. For example, the thickness of the frame 16 can be set to 0. 2 mm or less, set the width of the side to 0. 45 mm or less, making it easy to realize a thin and narrow frame. Further, by making the frame 16 thinner, a plate thickness of 0 can be used. Extremely thin light guide plate below 2 mm, so as to obtain a thinner backlight device. In addition, the sheet, the diffusion adhesive layers 24a, 24b on the sheet, and the reflective sheet RE and the frame 16 are punched out at one time, so that the width of the diffusion adhesive layers 24a, 24b and the outer shape of the reflective sheet RE can be made. The dimensions match the frame 16 with high accuracy. As a comparative example, a structure was studied in which a frame was first formed as a single body, and thereafter, a diffusion adhesive layer was attached to or after the frame. In the case of the comparative example, if the width of each side portion of the frame is formed to be very narrow, it is difficult to set the diffusion adhesive layer on the upper and lower surfaces of each side portion, and the diffusion adhesive layer overflows from each side portion. The overflowing adhesive not only adversely affects the subsequent steps, but also causes the light-emitting performance of the backlight device to decrease if it is attached to other components of the backlight device. On the other hand, in the backlight device of this embodiment, the widths of the diffusion adhesive layers 24 a and 24 b are consistent with the width of the side of the frame 16, and the sides (side edges) of the diffusion adhesive layers 24 a and 24 b are aligned with the width of the frame 16. The sides (side edges) are aligned on the same plane. As a result, in this embodiment, the dimensional accuracy of the backlight device is improved. Further, the sheet 50, the diffusion adhesive layers 24a, 24b, and the reflective sheet RE are integrated by a so-called roll-to-roll method, and then these are punched out at one time. By this manufacturing method, manufacturing steps are simplified and mass production is achieved. In addition, the accuracy of each component is improved, and further, the tolerance between each component required to form such a time is reduced. As a result, this embodiment can contribute to a reduction in thickness and a narrower frame. Next, liquid crystal display devices and backlight devices according to other embodiments or modifications will be described. In addition, in other embodiments and modifications described below, the same parts as those in the first embodiment described above are marked with the same reference numerals and detailed descriptions are omitted or simplified to make the parts different from the first embodiment. Detailed description for the center. (Second Embodiment) Fig. 13 is a cross-sectional view of a liquid crystal display device according to a second embodiment, and Fig. 14 is a longitudinal cross-sectional view of a liquid crystal display device according to a second embodiment. As shown in FIGS. 13 and 14, according to this embodiment, in the liquid crystal display device 10, the optical sheet OS of the backlight unit 20 is adhered to the second surface SF2 of the frame 16 via the second diffusion adhesive layer 24 b. The optical sheet OS is opposed to the light guide plate LG with a gap. The optical sheet OS includes a diffusion sheet OS1 and a corner pillar sheet OS2. The diffusion sheet OS1 is attached to the upper surface SF2 of the frame 16 via the second diffusion adhesive layer 24b. The corner pillar sheet OS2 is disposed on the diffusion sheet OS1 in an overlapping manner. Moreover, the corner pillar sheet OS2 is in contact with the polarizing plate PL2 of the liquid crystal display panel 12, that is, the entire surface is in contact with the polarizing plate PL2. The polarizing plate PL2 is attached to the back surface of the second substrate SUB2 via a diffusion adhesive layer 40 containing minute beads. On the left and right side portions 16a, 16b and the upper side portion 16c of the frame 16, the outer side surface of the frame 16 and the side surfaces of the diffusion sheet OS and the corner pillar sheet OS2 are the same plane. Furthermore, at the three side portions 16a, 16b, and 16c, the outer side surface is aligned with the side surface of the polarizing plate PL2 of the liquid crystal display panel 12 and the side surfaces of the first and second insulating substrates SUB1 and SUB2. The width W1 of the left and right side portions 16 a and 16 b and the width W 2 of the upper side portion 16 c are respectively consistent with the width of the frame region ED of the liquid crystal display panel 12. Thereby, the three side portions 16a, 16b, and 16c overlap the frame region ED of the liquid crystal display panel 12 in a plan view. Furthermore, the unevenness of the diffusion sheet OS1 is buried by the second diffusion adhesive layer 24b, the difference in refractive index between the interface between the diffusion sheet OS1 and the second diffusion adhesive layer 24b is small, and the light diffusion at the interface is reduced. However, due to the light diffusivity of the second diffusion adhesive layer 24b, the light from the frame 16 can be emitted to the optical sheet OS satisfactorily. According to the second embodiment configured as described above, it is not necessary to consider the tolerance between the frame and the optical sheet. As a result, the frame 16 functioning as a light source can be disposed inside the liquid crystal display panel 12, that is, closer to the effective display area DA than the first embodiment described above. Thereby, a narrower frame of the liquid crystal display device can be realized. Moreover, even when the diffusion sheet and the corner sheet are integrated with the polarizing plate PL2 of the liquid crystal display panel 12, the diffusion adhesive layer between the polarizing plate PL2 and the second insulating substrate SUB2 of the liquid crystal display panel 12 can be used. 40 has a light diffusion function, and the diffusion function of the offset diffusion sheet OS1 is reduced, so that display unevenness when viewed from the side of the cover plate 14 is reduced. The diffusion adhesive layer 40 is set to a size that does not overflow from the polarizing plate PL2 to prevent folding of unnecessary light. In addition, in the second embodiment, the same functions and effects as those of the first embodiment can be obtained. (Third Embodiment) Fig. 15 is a cross-sectional view of a liquid crystal display device according to a third embodiment, and Fig. 16 is a longitudinal cross-sectional view of a liquid crystal display device according to a third embodiment. As shown in FIG. 15 and FIG. 16, according to this embodiment, the frame 16 functioning as a light source is disposed so as to enter further inside than the liquid crystal display panel 12, that is, enter the effective display area DA side. One pair of the long side portions 16a, 16b of the frame 16 and the short side portion 16c on the opposite side from the light source unit 30 are located in the thickness direction of the liquid crystal display panel 12 and overlap the frame area (non-display area) ED of the liquid crystal display panel 12 Position, and at least a part, here, the inner edge portion facing the light guide plate LG is located at a position overlapping the effective display area DA. In the third embodiment, other configurations of the liquid crystal display device 10 are the same as those of the liquid crystal display device 10 of the second embodiment. According to the third embodiment configured as described above, by using the frame 16 functioning as a light source, the frame 16 can be disposed inside the liquid crystal display panel 12 more than a position overlapping the effective display area DA. Thereby, a narrower frame of the liquid crystal display device can be realized. Furthermore, since the frame 16 and the effective display area DA may be overlapped, when the liquid crystal display device is manufactured, the adhesion of the backlight unit 20 to the liquid crystal display panel 12 can be offset to some extent. This can improve the assemblability or manufacturability of the liquid crystal display device. In addition, in the third embodiment, it is possible to obtain the same effect as the first embodiment. (Fourth Embodiment) Fig. 17 is a cross-sectional view of a liquid crystal display device according to a fourth embodiment, and Fig. 18 is a longitudinal cross-sectional view of a liquid crystal display device according to a fourth embodiment. As shown in FIG. 17 and FIG. 18, according to this embodiment, the reflection sheet RE of the backlight unit 20 has a plurality of extended end portions REE extending outwardly from the outer peripheral edge of the frame 16. The extended end portions REE are bent toward the cover plate 14 and are attached to the outer side surface of the frame 16 and the outer side surface of the liquid crystal display panel 12. In this embodiment, at one pair of the long side portions 16a, 16b and the short side portion 16c of the frame 16, the outer side of the frame 16, the first and second diffusion adhesive layers 24a, are covered with the extended end portion REE of the reflection sheet RE. The outer side surface of 24b and the outer side surface of the liquid crystal display panel 12. Thereby, light leaking from the outer surface of the frame 16, the sides of the first and second diffusion adhesive layers 24a, 24b, and the side of the optical sheet OS can be reflected at the extended end portion REE of the reflection sheet RE and returned to the frame. 16 and the first and second diffusion adhesive layers 24a and 24b, and irradiate the liquid crystal display panel 12 side. Thereby, the light utilization efficiency of the backlight unit 20 can be improved. In addition, in the fourth embodiment, the other configurations of the liquid crystal display device 10 are the same as those of the second embodiment or the third embodiment described above. (Fifth Embodiment) Fig. 19 is a perspective view showing a liquid crystal display device according to a fifth embodiment, and Fig. 20 is a cross-sectional view of the liquid crystal display device taken along line C-C in Fig. 19. Since the liquid crystal display device of this embodiment is extremely thin, it is also possible to bend at least a part of the liquid crystal display device in an out-of-plane direction. As shown in FIGS. 19 and 20, in the fifth embodiment, both end portions on the long side of the liquid crystal display device 10 constitute curved portions CA that are bent downward, that is, toward the backlight device 20 side. In one example, both ends of the long side of the cover plate 14 are bent and formed in advance toward the backlight device 20 side. The liquid crystal display panel 12 including the polarizing plates PL1 and PL2 is attached to the cover plate 14 by an adhesive sheet AD including a transparent resin for optics. Thereby, both ends of the long side of the liquid crystal display panel 12 are bent along the cover plate 14. In this embodiment, both end portions of the long side of the liquid crystal display panel 12 extend to a position where the two end edges of the long side of the cover plate 14 are the same plane. The degree of bending of the bent portion CA, for example, the radius of curvature, can be arbitrarily adjusted. In the backlight unit 20, an optical sheet (diffusion sheet) OS1 is placed on the light guide plate LG and disposed inside the frame 16. An optical sheet (corner sheet) OS2 is placed on the optical sheet OS1, and a peripheral portion of the optical sheet OS2 is attached to the second surface SF2 of the frame 16 via the second diffusion adhesive layer 24b. In this embodiment, the size of the optical sheet OS2 is formed to be slightly smaller than the outer dimension of the frame 16. As a result, the side edge of the long side of the optical sheet OS2 is located more inward than the outer side edges of the long side portions 16 a and 16 b of the frame 16. The backlight unit 20 is provided to face the flat portion of the liquid crystal display panel 12. The light guide plate LG and the optical sheet OS1 face the display area DA of the liquid crystal display panel 12. The peripheral edge portion of the optical sheet OS2, that is, the portion overlapping the frame 16 is attached to the polarizing plate PL2 through the transparent diffusion adhesive layer 40. Thereby, the backlight unit 20 is attached to the liquid crystal display panel 12. The diffusion adhesive layer 40 contains fine beads and has light diffusivity. The diffusion adhesive layer 40 is provided on the surface of the polarizing plate PL2 from the position facing the frame 16 to the position facing the inner edge of the sealing material SE from the polarizing plate PL2. The curved portions CA of the cover plate 14 and the liquid crystal display panel 12 extend outward beyond the two side edges of the long side of the frame 16, cover the outer side surface 16 f of the frame 16, and slantly oppose the outer side surface 16 f. The backlight unit 20 is formed in a flat plate shape and does not protrude to the curved portion CA. With the backlight unit 20 mounted in this state, the outer side surface of the frame 16 faces the curved portion CA. According to the fifth embodiment configured as described above, the curved portions CA are formed by bending both ends of the long side of the liquid crystal display panel 12 to realize diversification of panel design and the range of use of the liquid crystal display device. Expansion. Moreover, by extending the edge portions of both sides of the liquid crystal display panel 12 beyond the frame 16 to the side edges of the cover plate 14, the effective display area DA of the liquid crystal display panel 12 can be enlarged by the amount of the area DA2 accordingly. That is, according to this embodiment, the frame 16 located around the light guide plate LG can function as an auxiliary light source unit that irradiates light to the liquid crystal display panel 12 side. Therefore, the display area DA2 located outside the light guide plate LG can be aligned from the frame. Also irradiated with light. Therefore, an image can be displayed using the display area DA2 as an effective display area. In this way, the liquid crystal display device 10 with a narrower frame can be realized at the edges of both sides of the long side of the liquid crystal display panel 12 until the outer side of the backlight unit 20 substantially including the frame 16 can be used as an effective illumination area. In addition, in the fifth embodiment, it is possible to obtain the same effect as the first embodiment. In addition, in the fifth embodiment, the bent portion is not limited to both side portions on the long side, and may be configured to bend the entire liquid crystal display device. (First Modification) FIG. 21 is a sectional view showing a part of a liquid crystal display device according to a first modification. In the fifth embodiment described above, a configuration in which the frame 16 is wide and a part of the frame 16 is bent along the liquid crystal display panel 12 may be adopted. As shown in FIG. 21, in the first modification, the long side portions 16 a and 16 b of the frame 16 are formed to be wide, respectively, and extend from the vicinity of the side surface of the light guide plate LG to the vicinity of the inner edge of the sealing material SE of the liquid crystal display panel 12. . The end of the reflection sheet RE is attached to the lower surface SF1 of the frame 16 by the first diffusion adhesive layer 24 a and covers the lower surface SF1 of the frame 16. The end of the optical sheet (corner sheet) OS2 is attached to the upper surface SF2 of the frame 16 by the second diffusion adhesive layer 24b, and covers the upper surface SF2 of the frame 16. In this modification, the side surface of the reflection sheet RE and the side surface of the optical sheet OS2 are the same plane as the outer side surface of the frame 16. The peripheral edges of the frame 16 and the optical sheet OS2 are attached to the polarizing plate PL2 of the liquid crystal display panel 12 through a diffusion adhesive layer 40 having light diffusivity. Thereby, the frame 16, the peripheral edge portion of the reflection sheet RE, and the peripheral edge portion of the optical sheet OS2 are bent along the liquid crystal display panel 12, and face the curved portion CA and the display area DA2 of the liquid crystal display panel 12. According to the first modification, the frame 16 functioning as an auxiliary light source is provided over the entire area of the curved portion CA and the display area DA2, so that more light can be irradiated to the display area DA2. Moreover, even in this case, the frame 16 functions as an auxiliary light source, and therefore, it does not hinder the narrow frame of the liquid crystal display device. Since the display area DA2 is irradiated with light from the auxiliary light source, it is considered that the brightness is slightly lower than that of the display area DA. On the other hand, an auxiliary use of the auxiliary window when the display area DA2 including the curved portion CA is used as a main window is set. In a case where the display area DA2 is used for such an auxiliary purpose, it can be effectively used even when the brightness of the display area DA is reduced compared to the display area DA. (Second Modification) FIG. 22 is a cross-sectional view showing a part of a liquid crystal display device according to a second modification. In this modification, only the peripheral edge portion of the optical sheet OS2 extends to the vicinity of the sealing material SE of the liquid crystal display panel 12, and is attached to the polarizing plate PL2 through the diffusion adhesive layer 40. The long edge portions 16a, 16b of the frame 16, the peripheral edges of the first diffusion adhesive layer 24a, the second diffusion adhesive layer 24b, and the reflection sheet RE are formed to be slightly shorter than the optical sheet OS2, and extend to the front of the sealing material SE. That is, in such a configuration, the light emitted from the frame 16 can be diffused and irradiated to the entire display area DA2 by the optical sheet OS2 and the diffusion adhesive layer 40. In addition, since the width of the backlight unit 20 can be made small, it contributes to miniaturization of the entire liquid crystal display device. Although certain embodiments and modifications have been described, these embodiments and modifications are presented by way of example only and are not intended to limit the scope of the invention. In fact, the novel methods and systems described herein can be implemented in a variety of other forms. In addition, various omissions, substitutions, and changes can be made to the methods and systems described herein without departing from the spirit of the invention. It is intended that the appended claims and their equivalents cover such forms or modifications as would fall within the scope and spirit of the invention. All the constitutions and manufacturing steps that can be implemented by a supplier based on the above-mentioned respective constitutions and manufacturing steps that are the embodiments of the present invention can be implemented as appropriate, as long as they include the gist of the present invention and fall within the scope of the present invention. For example, it is also possible to adopt a configuration in which the liquid crystal display panel is not first mounted on the cover plate, but is mounted on the cover plate together with the flange of the housing case after being housed in the housing case containing the backlight unit. In addition, it is also possible to adopt a configuration in which the liquid crystal display panel can be moved slightly in the storage case without being attached to the cover. Furthermore, a configuration in which the liquid crystal display panel is fixed to the backlight unit and the mutually fixed backlight unit and the liquid crystal display panel are housed in a housing case can also be adopted. It is to be understood that other actions and effects brought about by the above-mentioned embodiment can be appropriately associated by those skilled in the art in the description of the present specification. The optical sheet of the backlight unit is not limited to two, and may be increased or decreased as necessary. The components of the liquid crystal display panel, the backlight unit, and the shape outside and inside of the frame are not limited to a rectangular shape, and either or both of the external shape or the inner diameter may be polygonal, circular, or oval in plan view. And other shapes such as those made by combining them. The materials constituting the members are not limited to the above examples, and various choices can be made.

10‧‧‧液晶顯示裝置10‧‧‧ Liquid crystal display device

12‧‧‧液晶顯示面板12‧‧‧ LCD display panel

12a‧‧‧顯示面12a‧‧‧display surface

14‧‧‧蓋板14‧‧‧ Cover

16‧‧‧框架16‧‧‧Frame

16a‧‧‧框架之長邊部16a‧‧‧The long side of the frame

16b‧‧‧框架之長邊部16b‧‧‧The long side of the frame

16c‧‧‧框架之短邊部16c‧‧‧The short side of the frame

16d‧‧‧框架之短邊部16d‧‧‧ short side of frame

16f‧‧‧框架之外側面16f‧‧‧ Outside the frame

17‧‧‧凹部17‧‧‧ recess

20‧‧‧背光單元20‧‧‧ backlight unit

21‧‧‧IC晶片21‧‧‧IC chip

22‧‧‧軟性印刷電路基板22‧‧‧Flexible printed circuit board

24a‧‧‧第1擴散黏著層24a‧‧‧The first diffusion adhesive layer

24a(da)‧‧‧第1擴散黏著層之光擴散性24a (da) ‧‧‧Light diffusion of the first diffusion adhesive layer

24b‧‧‧第2擴散黏著層24b‧‧‧Second diffusion adhesive layer

24b(db)‧‧‧第2擴散黏著層之光擴散性24b (db) ‧‧‧Light diffusivity of the second diffusion adhesive layer

24b1‧‧‧第2擴散黏著層24b1‧‧‧Second diffusion adhesive layer

24b2‧‧‧第2擴散黏著層24b2‧‧‧Second diffusion adhesive layer

30‧‧‧光源單元30‧‧‧light source unit

32‧‧‧光源單元之印刷電路基板32‧‧‧ printed circuit board for light source unit

32a‧‧‧連接端部32a‧‧‧Connection end

34‧‧‧LED34‧‧‧LED

34a‧‧‧出射面34a‧‧‧ exit surface

34b‧‧‧安裝面34b‧‧‧Mounting surface

36‧‧‧第3接著劑層36‧‧‧The third adhesive layer

37‧‧‧第4接著劑層37‧‧‧ 4th adhesive layer

40‧‧‧擴散黏著層40‧‧‧ diffusion adhesion layer

50‧‧‧PET片材50‧‧‧PET sheet

52a‧‧‧內孔52a‧‧‧inner hole

52b‧‧‧內孔52b‧‧‧inner hole

80a‧‧‧搬送輥80a‧‧‧ transporting roller

80b‧‧‧搬送輥80b‧‧‧ transporting roller

82a‧‧‧搬送輥82a‧‧‧ transport roller

82b‧‧‧搬送輥82b‧‧‧ transporting roller

AD‧‧‧黏著片AD‧‧‧ Adhesive Sheet

B‧‧‧微小珠粒B‧‧‧ micro beads

CA‧‧‧彎曲部CA‧‧‧ Bending

CP‧‧‧搬送路徑CP‧‧‧ transport route

DA‧‧‧顯示區域(工作區域)DA‧‧‧ Display Area (Working Area)

DA2‧‧‧外側之顯示區域DA2‧‧‧ outside display area

ED‧‧‧邊框區域(非顯示區域)ED‧‧‧ border area (non-display area)

EF‧‧‧入射面EF‧‧‧ incident surface

LG‧‧‧導光板LG‧‧‧ light guide

Lh‧‧‧LED之高度(厚度)Lh‧‧‧LED height (thickness)

LQ‧‧‧液晶層LQ‧‧‧LCD layer

OS‧‧‧光學片OS‧‧‧Optical sheet

OS1‧‧‧擴散片OS1‧‧‧ diffuser

OS2‧‧‧角柱薄片OS2‧‧‧Angle Post

P1‧‧‧第1沖裁加工機P1‧‧‧The first punching machine

P2‧‧‧第2沖裁加工機P2‧‧‧The second punching machine

PL1‧‧‧偏光板PL1‧‧‧Polarizer

PL2‧‧‧偏光板PL2‧‧‧Polarizer

RA1‧‧‧輥RA1‧‧‧roller

RA2a‧‧‧輥RA2a‧‧‧roller

RA2b‧‧‧輥RA2b‧‧‧roller

RC‧‧‧回收輥RC‧‧‧Recycling roller

RE‧‧‧反射片RE‧‧‧Reflector

REE‧‧‧延伸端部REE‧‧‧Extended End

RP‧‧‧輥RP‧‧‧roller

RR‧‧‧輥RR‧‧‧roller

RS‧‧‧遮光層RS‧‧‧ shading layer

RS1‧‧‧輥RS1‧‧‧roller

RS2‧‧‧輥RS2‧‧‧roller

S1‧‧‧導光板之第1主面S1‧‧‧The first main surface of the light guide plate

S2‧‧‧導光板之第2主面S2‧‧‧The second main surface of the light guide plate

SE‧‧‧密封材料SE‧‧‧sealing material

SF1‧‧‧框架之下表面(第1面)SF1‧‧‧Underside surface of the frame (first side)

SF2‧‧‧框架之上表面(第2面)SF2‧‧‧ Upper surface of the frame (second side)

SUB1‧‧‧第1絕緣基板SUB1‧‧‧The first insulating substrate

SUB2‧‧‧第2絕緣基板SUB2‧‧‧Second insulating substrate

T1‧‧‧厚度T1‧‧‧thickness

T2‧‧‧厚度T2‧‧‧thickness

T3‧‧‧厚度T3‧‧‧thickness

W1‧‧‧寬度W1‧‧‧Width

W2‧‧‧寬度W2‧‧‧Width

W3‧‧‧寬度W3‧‧‧Width

圖1係表示實施形態之液晶顯示裝置之顯示面側之立體圖。 圖2係表示上述液晶顯示裝置之背面側之立體圖。 圖3係上述液晶顯示裝置之分解立體圖。 圖4係沿圖1之線A-A之上述液晶顯示裝置之剖視圖。 圖5係沿圖1之線B-B之上述液晶顯示裝置之剖視圖。 圖6A係模式性地表示設置於框架之擴散性黏著層之擴散性之分佈之圖。 圖6B係模式性地表示設置於框架之擴散性黏著層之擴散性之分佈之圖。 圖7係概略性地表示背光裝置之製造裝置之一例之圖。 圖8係表示背光裝置之製造步驟中之片材基材之立體圖。 圖9係表示於上述製造步驟中於片材基材之第1面及第2面分別形成有擴散黏著層之狀態之立體圖。 圖10係表示於上述製造步驟中沖裁有框架之內窗(內孔)之狀態之立體圖。 圖11係表示於上述製造步驟中於一擴散黏著層貼附有反射片之狀態之立體圖。 圖12係表示於上述製造步驟中藉由沖裁而形成外形之背光裝置之立體圖。 圖13係第2實施形態之液晶顯示裝置之橫剖視圖。 圖14係第2實施形態之液晶顯示裝置之縱剖視圖。 圖15係第3實施形態之液晶顯示裝置之橫剖視圖。 圖16係第3實施形態之液晶顯示裝置之縱剖視圖。 圖17係第4實施形態之液晶顯示裝置之橫剖視圖。 圖18係第4實施形態之液晶顯示裝置之縱剖視圖。 圖19係表示第5實施形態之液晶顯示裝置之顯示面側之立體圖。 圖20係沿圖19之線C-C之液晶顯示裝置之剖視圖。 圖21係第1變化例之液晶顯示裝置之剖視圖。 圖22係第2變化例之液晶顯示裝置之剖視圖。FIG. 1 is a perspective view showing a display surface side of a liquid crystal display device according to an embodiment. FIG. 2 is a perspective view showing the back side of the liquid crystal display device. FIG. 3 is an exploded perspective view of the liquid crystal display device. FIG. 4 is a cross-sectional view of the above-mentioned liquid crystal display device along line A-A of FIG. 1. FIG. FIG. 5 is a cross-sectional view of the above-mentioned liquid crystal display device along line B-B of FIG. 1. FIG. FIG. 6A is a diagram schematically showing a diffusivity distribution of a diffusive adhesive layer provided on a frame. FIG. FIG. 6B is a diagram schematically showing a diffusivity distribution of a diffusive adhesive layer provided on a frame. FIG. FIG. 7 is a diagram schematically showing an example of a manufacturing apparatus for a backlight device. FIG. 8 is a perspective view showing a sheet substrate in a manufacturing step of the backlight device. FIG. 9 is a perspective view showing a state where a diffusion adhesive layer is formed on each of the first surface and the second surface of the sheet substrate in the above manufacturing steps. FIG. 10 is a perspective view showing a state in which an inner window (inner hole) having a frame is punched in the above manufacturing step. FIG. 11 is a perspective view showing a state in which a reflective sheet is attached to a diffusion adhesive layer in the above manufacturing steps. FIG. 12 is a perspective view showing a backlight device having an external shape formed by punching in the above manufacturing steps. FIG. 13 is a cross-sectional view of a liquid crystal display device according to a second embodiment. Fig. 14 is a longitudinal sectional view of a liquid crystal display device according to a second embodiment. 15 is a cross-sectional view of a liquid crystal display device according to a third embodiment. Fig. 16 is a longitudinal sectional view of a liquid crystal display device according to a third embodiment. Fig. 17 is a cross-sectional view of a liquid crystal display device according to a fourth embodiment. Fig. 18 is a longitudinal sectional view of a liquid crystal display device according to a fourth embodiment. FIG. 19 is a perspective view showing a display surface side of a liquid crystal display device according to a fifth embodiment. FIG. 20 is a cross-sectional view of the liquid crystal display device taken along the line C-C of FIG. 19. FIG. FIG. 21 is a cross-sectional view of a liquid crystal display device according to a first modification. 22 is a cross-sectional view of a liquid crystal display device according to a second modification.

Claims (20)

一種背光裝置，其具備：框狀之框架，其由透明之樹脂形成；第1擴散黏著層，其設置於上述框架之第1面，且具有光擴散性；第2擴散黏著層，其設置於上述框架之與上述第1面為相反側之第2面，且具有光擴散性；反射片，其經由上述第1擴散黏著層而貼附於上述框架；導光板，其於上述框架內載置於上述反射片上；及光源，其配置於上述框架內，且將光入射至上述導光板。A backlight device includes: a frame-shaped frame formed of a transparent resin; a first diffusion adhesive layer provided on the first surface of the frame and having light diffusibility; and a second diffusion adhesive layer provided on The second surface of the frame is opposite to the first surface and has a light diffusing property; a reflective sheet is attached to the frame through the first diffusion adhesive layer; a light guide plate is placed in the frame On the above-mentioned reflection sheet; and a light source, which is arranged in the above-mentioned frame and makes light incident on the above-mentioned light guide plate. 如請求項1之背光裝置，其進而具備光學片，該光學片於上述框架內配置於上述導光板上。The backlight device according to claim 1, further comprising an optical sheet disposed on the light guide plate in the frame. 如請求項1之背光裝置，其進而具備光學片，該光學片經由上述第2擴散黏著層而貼附於上述框架，且與上述導光板對向。The backlight device according to claim 1, further comprising an optical sheet, which is attached to the frame via the second diffusion adhesive layer and faces the light guide plate. 如請求項1至3中任一項之背光裝置，其中上述第1擴散黏著層及第2擴散黏著層，係包含黏合劑、及折射率與該黏合劑不同且分散於該黏合劑內之微小珠粒而形成。For example, the backlight device of any one of claims 1 to 3, wherein the first diffusion adhesive layer and the second diffusion adhesive layer include a binder, and a minute refractive index different from the binder and dispersed in the binder. Beads are formed. 如請求項4之背光裝置，其中上述第1擴散黏著層具有較上述第2擴散黏著層高之光擴散性。The backlight device according to claim 4, wherein the first diffusion adhesive layer has a higher light diffusivity than the second diffusion adhesive layer. 如請求項1之背光裝置，其中上述框架由透明之樹脂片材形成，於上述框架之至少一部分，上述框架之寬度與上述第1擴散黏著層之寬度一致，至少上述框架之外側面與上述第1擴散黏著層之外側面排列於同一平面。For example, in the backlight device of claim 1, wherein the frame is formed of a transparent resin sheet, and at least a part of the frame, the width of the frame is consistent with the width of the first diffusion adhesive layer, and at least the outer side of the frame and the first 1 The outer side of the diffusion adhesive layer is aligned on the same plane. 如請求項6之背光裝置，其中於上述至少一部分，上述反射片之側面與上述第1擴散黏著層及上述框架之外側面排列於同一平面。According to the backlight device of claim 6, in at least a part of the above, the side surface of the reflective sheet is aligned with the first diffusion adhesive layer and the outer side surface of the frame on the same plane. 如請求項6或7之背光裝置，其中上述框架之厚度為0.4mm以下。The backlight device of claim 6 or 7, wherein the thickness of the above frame is 0.4 mm or less. 如請求項1之背光裝置，其中上述框架具有至少4個邊部，該等至少4個邊部包含與上述光源鄰接之第1邊部、及位於與該第1邊部為相反側之第2邊部，且設置於上述第2邊部之上述第1擴散黏著層之擴散性，低於設置於其他邊部之上述第1擴散黏著層之擴散性。The backlight device according to claim 1, wherein the frame has at least 4 side portions, and the at least 4 side portions include a first side portion adjacent to the light source, and a second side located on an opposite side to the first side portion. The diffusivity of the first diffusive adhesive layer provided on the side and the second diffusive layer is lower than that of the first diffusive adhesive layer provided on the other side. 如請求項1之背光裝置，其中上述反射片具有覆蓋上述框架之外側面以及上述第1及第2擴散黏著層之外側面之延伸端部。The backlight device according to claim 1, wherein the reflective sheet has an extended end portion covering an outer side surface of the frame and outer side surfaces of the first and second diffusion adhesive layers. 一種液晶顯示裝置，其包括：液晶顯示面板；及如請求項1之背光裝置，其與上述液晶顯示面板對向配置。A liquid crystal display device includes: a liquid crystal display panel; and the backlight device as claimed in claim 1, which is arranged opposite to the liquid crystal display panel. 如請求項11之液晶顯示裝置，其中上述框架經由上述第2擴散黏著層而貼附於上述液晶顯示面板，上述背光裝置具備於上述框架內配置於上述導光板上之光學片。The liquid crystal display device according to claim 11, wherein the frame is attached to the liquid crystal display panel via the second diffusion adhesive layer, and the backlight device includes an optical sheet disposed on the light guide plate in the frame. 如請求項11之液晶顯示裝置，其中上述背光裝置具備經由上述第2擴散黏著層而貼附於上述框架之光學片，且上述光學片抵接於上述液晶顯示面板。The liquid crystal display device according to claim 11, wherein the backlight device includes an optical sheet attached to the frame via the second diffusion adhesive layer, and the optical sheet abuts the liquid crystal display panel. 如請求項11至13中任一項之液晶顯示裝置，其中上述液晶顯示面板具有顯示區域、及位於該顯示區域之周圍之非顯示區域，且上述框架於上述液晶顯示面板之厚度方向位於與上述非顯示區域重疊之位置，並且至少一部分位於與上述顯示區域重疊之位置。The liquid crystal display device according to any one of claims 11 to 13, wherein the liquid crystal display panel has a display area and a non-display area located around the display area, and the frame is positioned in the thickness direction of the liquid crystal display panel and The non-display area overlaps the position, and at least a part of the non-display area overlaps the display area. 如請求項11至13中任一項之液晶顯示裝置，其中上述第1擴散黏著層由黏合劑、及折射率與該黏合劑不同且分散於該黏合劑內之微小珠粒形成。The liquid crystal display device according to any one of claims 11 to 13, wherein the first diffusion adhesive layer is formed of an adhesive and fine beads having a refractive index different from that of the adhesive and dispersed in the adhesive. 如請求項15之液晶顯示裝置，其中上述第2擴散黏著層由黏合劑、及折射率與該黏合劑不同且分散於該黏合劑內之微小珠粒形成，上述第1擴散黏著層具有較上述第2擴散黏著層高之光擴散性。For example, in the liquid crystal display device of claim 15, wherein the second diffusion adhesive layer is formed of an adhesive and tiny beads having a refractive index different from that of the adhesive and dispersed in the adhesive, the first diffusion adhesive layer has a higher density than the above. High light diffusion of the second diffusion adhesive layer. 如請求項11至13中任一項之液晶顯示裝置，其中上述框架由透明之樹脂片材形成，於上述框架之至少一部分，上述框架之寬度與上述第1擴散黏著層之寬度一致，至少上述框架之外側面與上述第1擴散黏著層之外側面排列於同一平面。The liquid crystal display device according to any one of claims 11 to 13, wherein the frame is formed of a transparent resin sheet, and at least a part of the frame, the width of the frame is consistent with the width of the first diffusion adhesive layer, at least the above The outer surface of the frame and the outer surface of the first diffusion adhesive layer are aligned on the same plane. 如請求項11至13中任一項之液晶顯示裝置，其中上述液晶顯示面板具有至少一部分向上述背光裝置側彎曲之彎曲部。The liquid crystal display device according to any one of claims 11 to 13, wherein the liquid crystal display panel has a bent portion at least partially bent toward the backlight device side. 如請求項18之液晶顯示裝置，其中上述液晶顯示面板具有相互對向之一對長邊及相互對向之一對短邊，上述液晶顯示面板之上述長邊側之側緣部形成向上述背光裝置側彎曲之彎曲部，且上述框架具有與上述彎曲部對向之長邊部。The liquid crystal display device of claim 18, wherein the liquid crystal display panel has a pair of long sides facing each other and a pair of short sides facing each other, and a side edge portion of the long side of the liquid crystal display panel is formed to face the backlight. The device has a bent portion that is bent, and the frame has a long side portion that opposes the bent portion. 如請求項13之液晶顯示裝置，其中上述液晶顯示面板具有相互對向之一對長邊及相互對向之一對短邊，上述液晶顯示面板之上述長邊側之側緣部形成向上述背光裝置側彎曲之彎曲部，上述框架具有與上述彎曲部對向之長邊部，且上述框架之長邊部隔著光學片及擴散黏著層而貼附於上述彎曲部，且沿上述彎曲部彎曲。The liquid crystal display device of claim 13, wherein the liquid crystal display panel has a pair of long sides facing each other and a pair of short sides facing each other, and a side edge portion of the long side of the liquid crystal display panel is formed toward the backlight. The bent portion on the device side, the frame has a long side portion facing the bent portion, and the long side portion of the frame is attached to the bent portion via an optical sheet and a diffusion adhesive layer, and is bent along the bent portion .
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