TWI662300B - Light diffusing sheet and backlight device including the same - Google Patents

Light diffusing sheet and backlight device including the same Download PDF

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TWI662300B
TWI662300B TW104116825A TW104116825A TWI662300B TW I662300 B TWI662300 B TW I662300B TW 104116825 A TW104116825 A TW 104116825A TW 104116825 A TW104116825 A TW 104116825A TW I662300 B TWI662300 B TW I662300B
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light
parts
resin
diffusing sheet
diffusing
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TW201602643A (en
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高井雅司
幸
橫田浩史
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日商木本股份有限公司
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    • 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Laminated Bodies (AREA)
  • Electromagnetism (AREA)

Abstract

本發明藉由具有高度光擴散性，在背光裝置，提供一種極力抑制亮度下降，且減低局部性亮度不均及局部漏光之光擴散性薄片。本發明的光擴散性薄片，其係具有光擴散層之光擴散性薄片，其特徵為前述光擴散層係包含黏結劑樹脂、與光擴散性樹脂粒子、與無機微粒子，前述光擴散性薄片藉由JIS Z 8722：2000之D65光源的透過測定方法之Y值為0.3以上且2.1以下。無機微粒子，例如為氧化鋯、氧化鈦、氧化鋅之1種或2種以上，相對於黏結劑樹脂(固體含量)100重量份含有40~480重量份。 The present invention provides a light diffusive sheet with high light diffusivity in a backlight device, which minimizes the decrease in brightness, and reduces local brightness unevenness and local light leakage. The light diffusing sheet of the present invention is a light diffusing sheet having a light diffusing layer, wherein the light diffusing layer includes a binder resin, light diffusing resin particles, and inorganic fine particles. The Y value of the transmission measurement method of the D65 light source according to JIS Z 8722: 2000 is 0.3 or more and 2.1 or less. The inorganic fine particles are, for example, one kind or two or more kinds of zirconia, titanium oxide, and zinc oxide, and contain 40 to 480 parts by weight based on 100 parts by weight of the binder resin (solid content).

Description

光擴散性薄片及包含該薄片之背光裝置 Light diffusing sheet and backlight device including the same

本發明係關於光擴散性薄片及包含該薄片之背光裝置。 The present invention relates to a light-diffusing sheet and a backlight device including the sheet.

已被用於顯示裝置等之背光裝置有邊光型與直下型，近年來由於裝置之薄型化或輕量化的要求，邊光型已成為主流。於邊光型之背光裝置，係組合導光板於LED或冷陰極管等之光源來使用，於該導光板之上，納入光擴散性薄膜等之光學構件。作為光擴散性薄片，尤其是已被廣泛用於擴散性高之高擴散型的光擴散性薄片。 Backlight devices that have been used for display devices include edge-light type and direct-light type. In recent years, the edge-light type has become mainstream due to the requirements for thinner or lighter devices. The edge-light type backlight device is used by combining a light guide plate with a light source such as an LED or a cold cathode tube, and an optical member such as a light diffusing film is incorporated on the light guide plate. As the light-diffusing sheet, it has been widely used as a light-diffusing sheet having a high diffusivity and a high diffusivity.

作為如此之光擴散性薄片，專利文獻1提案有滿足看不見被設置於導光板之圖型之光擴散性薄片原本的性能，且使顯示畫面之正面方向的亮度提昇之光擴散性薄片。 As such a light diffusing sheet, Patent Document 1 proposes a light diffusing sheet which satisfies the original performance of a light diffusing sheet provided in a pattern provided on a light guide plate and enhances the brightness in the front direction of a display screen.

[先前技術文獻] [Prior technical literature] [專利文獻] [Patent Literature]

[專利文獻1]日本特開平6-59107號公報 [Patent Document 1] Japanese Patent Laid-Open No. 6-59107

近年來為了盡可能廣泛地使用與背光裝置組合之顯示裝置的顯示部，有顯示畫面的邊框狹小化的傾向。其結果，導致接近背光裝置光源的部分亦被包含在顯示部的區域，例如包含有減低顯示部之光源附近的亮度不均，使導光板末端部分的漏光不明顯，有顯示面整體亮度的均一化之需求。惟，於專利文獻1之光擴散性薄片，並未考慮減低顯示部之光源附近的亮度不均，使導光板末端部分的漏光不明顯的課題。 In recent years, in order to use the display portion of a display device combined with a backlight device as widely as possible, the frame of a display screen tends to be narrow. As a result, the portion close to the light source of the backlight device is also included in the display area. For example, it includes reducing uneven brightness near the light source of the display portion, making light leakage at the end of the light guide plate inconspicuous, and uniform brightness on the entire display surface. Demand. However, in the light-diffusing sheet of Patent Document 1, the problem of reducing uneven brightness in the vicinity of the light source of the display portion and making light leakage at the end portion of the light guide plate inconspicuous is not considered.

又，一般為了實現亮度的均一化，考慮提高納入於背光裝置之光擴散性薄片、薄膜等之光擴散性。而且為了得到此高光擴散性，以往手法中，為了使光擴散層成為具有高霧值之塗膜，已有改變光擴散層中之樹脂粒子(光擴散材)的種類、粒徑、量等。惟，於此等之手段，霧值在某一高度的值就打住無法再高，即使有如此高之霧值，亦得不到上述之充分減低亮度不均或漏光之塗膜，進而即使添加樹脂粒子，亦有塗膜變脆弱、亮度下降等之問題。 In addition, in order to achieve uniformity of brightness, it is generally considered to improve the light diffusivity of light diffusing sheets, films, and the like incorporated in a backlight device. In addition, in order to obtain such high light diffusivity, conventionally, in order to make the light diffusing layer a coating film having a high haze value, the type, particle size, and amount of resin particles (light diffusing material) in the light diffusing layer have been changed. However, with these methods, the value of the haze at a certain height cannot be held high. Even with such a high haze value, the above-mentioned coating film that sufficiently reduces uneven brightness or light leakage cannot be obtained, and even if added, Resin particles also have problems such as weakening of the coating film and reduction in brightness.

本發明的目的係藉由具有高度光擴散性，在背光裝置，提供一種極力抑制亮度下降，且減低局部性亮度不均及局部漏光之光擴散性薄片。 The object of the present invention is to provide a light diffusing sheet which has a high light diffusivity, and is capable of suppressing the decrease in brightness and reducing local brightness unevenness and local light leakage.

為了達成上述目的，本發明者們發現，作為光擴散性的指標，不是用以往於此領域被廣泛使用之霧值(JIS K7105)，而是藉由CIE(國際照明委員會)-XYZ表色系之「Y值(明度)」來評價「高光擴散性」時，藉由將Y值定在特定範圍，可改善上述之亮度不均或末端部分的漏光而完成本發明。 In order to achieve the above object, the present inventors have found that as an indicator of light diffusivity, the fog value (JIS K7105), which has been widely used in this field in the past, is not used, but the CIE (International Commission on Illumination) -XYZ color system When "high light diffusivity" is evaluated based on "Y value (brightness)", by setting the Y value to a specific range, the above-mentioned uneven brightness or light leakage at the terminal portion can be improved, and the present invention has been completed.

亦即，本發明的光擴散性薄片係具有光擴散層之光擴散性薄片，其特徵為前述光擴散層係包含黏結劑樹脂、與光擴散性樹脂粒子、與無機微粒子，前述光擴散性薄片係藉由JIS Z 8722：2000之D65光源的透過測定方法之Y值為0.3以上且2.1以下。 That is, the light diffusing sheet of the present invention is a light diffusing sheet having a light diffusing layer, and the light diffusing layer includes a binder resin, light diffusing resin particles, and inorganic fine particles. The Y value of the transmission measurement method by the D65 light source according to JIS Z 8722: 2000 is 0.3 or more and 2.1 or less.

又，本發明的光擴散性薄片將上述特徵作為基本，無機微粒子及黏結劑可採用以下的態樣。 In addition, the light diffusing sheet of the present invention is based on the above-mentioned characteristics, and the inorganic fine particles and the binder can adopt the following aspects.

無機微粒子係較黏結劑樹脂折射率更高之高折射率金屬氧化物。 Inorganic fine particles are high refractive index metal oxides with a higher refractive index than that of binder resins.

無機微粒子的折射率為1.9以上。 The refractive index of the inorganic fine particles is 1.9 or more.

高折射率金屬氧化物為選自氧化鋯、氧化鈦、及氧化鋅中之一種以上。 The high refractive index metal oxide is one or more selected from the group consisting of zirconia, titanium oxide, and zinc oxide.

無機微粒子為氧化鋯，且相對於前述黏結劑樹脂(固體含量)100重量份包含120~320重量份。 The inorganic fine particles are zirconia, and contain 120 to 320 parts by weight based on 100 parts by weight of the aforementioned binder resin (solid content).

黏結劑樹脂係包含玻璃轉移溫度為30℃以下之丙烯酸多元醇樹脂。 The binder resin is an acrylic polyol resin having a glass transition temperature of 30 ° C. or lower.

黏結劑樹脂係進一步包含玻璃轉移溫度為40℃以上 之丙烯酸多元醇樹脂。 The binder resin system further includes a glass transition temperature of 40 ° C or higher. Acrylic polyol resin.

玻璃轉移溫度為30℃以下之丙烯酸多元醇樹脂(固體含量)與前述玻璃轉移溫度為40℃以上之丙烯酸多元醇樹脂(固體含量)的合計為100重量份時，前述玻璃轉移溫度為30℃以下之丙烯酸多元醇樹脂為50重量份以上。 When the total of the acrylic polyol resin (solid content) with a glass transition temperature of 30 ° C or lower and the acrylic polyol resin (solid content) with a glass transition temperature of 40 ° C or higher is 100 parts by weight, the glass transition temperature is 30 ° C or lower The acrylic polyol resin is 50 parts by weight or more.

又，本發明的光擴散性薄片，其特徵係全光線透過率為45%~88%。 The light diffusing sheet of the present invention is characterized by a total light transmittance of 45% to 88%.

又，本發明的光擴散性薄片，其特徵係包含黏結劑樹脂、與相對於前述黏結劑樹脂(固體含量)100重量份為60~120重量份的光擴散性樹脂粒子、與相對於前述黏結劑樹脂(固體含量)100重量份為40~480重量份的無機微粒子，無機微粒子的折射率為1.9以上，藉由JIS Z 8722：2000之D65光源的透過測定方法之Y值為0.3以上且2.1以下，全光線透過率為45%~88%。 The light diffusing sheet of the present invention is characterized in that it includes a binder resin, light diffusing resin particles of 60 to 120 parts by weight with respect to 100 parts by weight of the binder resin (solid content), and bonding with the above. 100 parts by weight of the resin resin (solid content) is 40 to 480 parts by weight of inorganic fine particles, the refractive index of the inorganic fine particles is 1.9 or more, and the Y value of the transmission measurement method of D65 light source according to JIS Z 8722: 2000 is 0.3 or more and 2.1 Below, the total light transmittance is 45% to 88%.

又，本發明的背光裝置係具備反射薄片、與設置於前述反射薄片的上方之導光板、與配置於前述導光板的側面之光源、與配置於前述導光板之光出射面之側的光擴散性薄片、與配置於前述光擴散性薄片之光出射面之側的棱鏡薄片，其特徵為使用本發明的光擴散性薄片作為前述光擴散性薄片。 The backlight device of the present invention includes a reflective sheet, a light guide plate provided above the reflective sheet, a light source disposed on a side surface of the light guide plate, and light diffusion disposed on a side of a light exit surface of the light guide plate. The light-diffusing sheet and the prism sheet disposed on the light-emitting surface side of the light-diffusing sheet are characterized in that the light-diffusing sheet of the present invention is used as the light-diffusing sheet.

又，本發明的背光裝置係具備光源、與配置於前述光源之一側的擴散板、與配置於前述光源之另一側的反射薄膜、與配置於前述擴散板的上方之光擴散性薄 片、與配置於前述光擴散性薄片之光出射面之側的棱鏡薄片，其特徵為使用本發明的光擴散性薄片作為前述光擴散性薄片。 The backlight device of the present invention includes a light source, a diffusion plate disposed on one side of the light source, a reflective film disposed on the other side of the light source, and a thin light diffusibility disposed above the diffusion plate. A sheet and a prism sheet disposed on the light emitting surface side of the light diffusing sheet, wherein the light diffusing sheet of the present invention is used as the light diffusing sheet.

本發明中，所謂光擴散性薄片，係指亦包含薄膜狀者等，又本發明的光擴散性薄片係包含以光擴散層之單層所構成者及層合光擴散層於透明基材等之支撐體上者。 In the present invention, the light-diffusing sheet refers to those that also include a thin film, and the light-diffusing sheet of the present invention includes a single layer composed of a light-diffusing layer, and a light-diffusing layer laminated on a transparent substrate. On the support.

根據本發明，藉由將Y值定在所期望的範圍，可提供一種具有高度光擴散性之光擴散性薄片。又納入於背光裝置時，可提供一種極力抑制亮度下降，且減低局部性亮度不均及局部漏光之光擴散性薄片。 According to the present invention, by setting the Y value to a desired range, a light-diffusing sheet having a high light-diffusing property can be provided. When incorporated into a backlight device, it can provide a light-diffusing sheet that minimizes the decrease in brightness and reduces local brightness unevenness and local light leakage.

10‧‧‧光擴散性薄片 10‧‧‧ light diffusing sheet

11‧‧‧光擴散層 11‧‧‧light diffusion layer

12‧‧‧支撐體 12‧‧‧ support

13‧‧‧背塗層 13‧‧‧Backcoat

30‧‧‧邊光型背光裝置 30‧‧‧ Edge-light type backlight

31‧‧‧棱鏡薄片 31‧‧‧ prism sheet

32‧‧‧棱鏡薄片 32‧‧‧ prism sheet

33‧‧‧光擴散性薄片 33‧‧‧light diffusing sheet

34‧‧‧光源 34‧‧‧light source

35‧‧‧導光板 35‧‧‧light guide

36‧‧‧反射薄片 36‧‧‧Reflective sheet

50‧‧‧直下型背光裝置 50‧‧‧ direct type backlight

51‧‧‧棱鏡薄片 51‧‧‧ prism sheet

52‧‧‧光擴散性薄片 52‧‧‧light-diffusing sheet

53‧‧‧擴散版 53‧‧‧ Diffusion

54‧‧‧光源 54‧‧‧light source

55‧‧‧框體 55‧‧‧Frame

56‧‧‧反射薄膜 56‧‧‧Reflective film

[圖1]表示本發明的光擴散性薄片之一實施形態的示意圖 Fig. 1 is a schematic view showing an embodiment of a light diffusing sheet according to the present invention

[圖2]表示使用本發明的光擴散性薄片之背光裝置之一實施形態的示意圖 Fig. 2 is a schematic view showing an embodiment of a backlight device using the light-diffusing sheet of the present invention

[圖3]表示使用本發明的光擴散性薄片之背光裝置其他實施形態的示意圖 3 is a schematic view showing another embodiment of a backlight device using the light-diffusing sheet of the present invention

[圖4]表示實施例15的結果之圖。 FIG. 4 is a graph showing the results of Example 15. FIG.

[圖5]表示實施例17~19的結果之圖。 Fig. 5 is a graph showing the results of Examples 17 to 19;

以下對於本發明的光擴散性薄片的實施形態進行說明。 Hereinafter, embodiments of the light-diffusing sheet of the present invention will be described.

本發明的光擴散性薄片係具有光擴散層之光擴散性薄片，光擴散層係包含黏結劑樹脂、與光擴散性樹脂粒子、與無機微粒子。光擴散性薄片係藉由JIS Z 8722：2000之D65光源的透過測定方法之Y值為0.3以上且2.1以下。三刺激值之一的Y值係取0~100之值，Y值越低則視感透過率越低，隱蔽性越高。於本發明，藉由將此Y值定為上述之範圍，不會降低適用本發明的光擴散性薄片之顯示裝置等之亮度，可防止顯示面的亮度不均或漏光。 The light diffusing sheet of the present invention is a light diffusing sheet having a light diffusing layer, and the light diffusing layer includes a binder resin, light diffusing resin particles, and inorganic fine particles. The light-diffusing sheet has a Y value of 0.3 or more and 2.1 or less according to the transmission measurement method of the D65 light source of JIS Z 8722: 2000. The Y value of one of the three stimulus values is a value from 0 to 100. The lower the Y value, the lower the visual transmission and the higher the concealment. In the present invention, by setting the Y value to the above range, the brightness of the display device or the like to which the light-diffusing sheet to which the present invention is applied is not reduced, and uneven brightness or light leakage on the display surface can be prevented.

Y值係藉由構成光擴散性薄片之要素，尤其是構成光擴散層之要素來決定，藉由調整此等，可實現作為目的之Y值。以下，說明用以實現上述之Y值之具體構成。 The Y value is determined by the elements constituting the light diffusing sheet, particularly the elements constituting the light diffusing layer, and the Y value as the purpose can be achieved by adjusting these. Hereinafter, a specific configuration for realizing the above-mentioned Y value will be described.

本發明的光擴散性薄片的結構若為包含光擴散層者，可為光擴散層單層，亦可為層合光擴散層於支撐體上者。又只要不阻礙光擴散層的機能，亦可具有其他層(包含光擴散層)。例如，如圖1所示，本實施形態之光擴散性薄片可包含光擴散層11、支撐體12、及背塗層。 If the structure of the light diffusing sheet of the present invention includes a light diffusing layer, it may be a single layer of a light diffusing layer, or a layer of a light diffusing layer on a support. As long as the function of the light diffusion layer is not hindered, other layers (including the light diffusion layer) may be included. For example, as shown in FIG. 1, the light diffusing sheet of this embodiment may include a light diffusing layer 11, a support 12, and a back coating layer.

其次對於光擴散層的構成進行說明。光擴散層係至少包含黏結劑樹脂、光擴散性樹脂粒子、及無機微 粒子。 Next, the structure of a light-diffusion layer is demonstrated. The light diffusing layer contains at least a binder resin, light diffusing resin particles, and inorganic fine particles. particle.

作為光擴散層的黏結劑樹脂，可列舉電離放射線硬化性樹脂、熱硬化性樹脂、熱塑性樹脂等。 Examples of the binder resin of the light diffusion layer include an ionizing radiation curable resin, a thermosetting resin, and a thermoplastic resin.

作為電離放射線硬化性樹脂，可使用藉由電離放射線(紫外線或電子束)的照射可交聯硬化之光聚合性預聚物，作為此光聚合性預聚物，於1分子中具有2個以上之丙烯醯基，特佳為藉由進行交聯硬化，使用成為三維網絡結構之丙烯酸系預聚物。作為此丙烯酸系預聚物，可使用胺基甲酸乙酯丙烯酸酯、聚酯丙烯酸酯、環氧丙烯酸酯、三聚氰胺丙烯酸酯、聚氟烷基丙烯酸酯、矽氧丙烯酸酯等。進而此等之丙烯酸系預聚物雖亦可單獨使用，但為了提昇交聯硬化性，更加提昇光擴散層的硬度，較佳為加入光聚合性單體。 As the ionizing radiation-curable resin, a photopolymerizable prepolymer that can be cross-linked and hardened by irradiation with ionizing radiation (ultraviolet rays or electron beams) can be used. As the photopolymerizable prepolymer, there are two or more in one molecule. The acrylic fluorenyl group is particularly preferably an acrylic prepolymer having a three-dimensional network structure by being cross-linked and hardened. As this acrylic prepolymer, urethane acrylate, polyester acrylate, epoxy acrylate, melamine acrylate, polyfluoroalkyl acrylate, silicone acrylate, etc. can be used. Furthermore, although these acrylic prepolymers may be used alone, it is preferable to add a photopolymerizable monomer in order to improve the cross-linking hardenability and further increase the hardness of the light diffusion layer.

作為光聚合性單體，使用2-乙基己基丙烯酸酯、2-羥基丙烯酸乙酯、2-羥基丙基丙烯酸酯、丁氧基丙烯酸乙酯等之單官能丙烯醯基單體、1,6-己二醇二丙烯酸酯、新戊二醇二丙烯酸酯、二乙二醇二丙烯酸酯、聚乙二醇二丙烯酸酯、羥基新戊酸酯新戊二醇二丙烯酸酯等之2官能丙烯醯基單體、二季戊四醇六丙烯酸酯、三甲基丙烷三丙烯酸酯、季戊四醇三丙烯酸酯等之多官能丙烯醯基單體等之1種或2種以上。 As the photopolymerizable monomer, monofunctional acrylic fluorenyl monomers such as 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, and ethyl butoxyacrylate, and 1,6 are used. -Bifunctional propylene such as hexanediol diacrylate, neopentyl glycol diacrylate, diethylene glycol diacrylate, polyethylene glycol diacrylate, hydroxypivalate neopentyl glycol diacrylate, etc. One or two or more kinds of polyfunctional propylene fluorene-based monomers such as a base monomer, dipentaerythritol hexaacrylate, trimethylpropane triacrylate, pentaerythritol triacrylate, and the like.

除了上述之光聚合性預聚物及光聚合性單體之外，藉由紫外線照射使其硬化時，較佳為使用光聚合起始劑或光聚合促進劑等之添加劑。 In addition to the photopolymerizable prepolymer and photopolymerizable monomer described above, when hardened by ultraviolet irradiation, it is preferable to use additives such as a photopolymerization initiator or a photopolymerization accelerator.

作為光聚合起始劑，可列舉苯乙酮、二苯甲酮、米蚩酮、安息香、苄基甲基縮酮、苯甲醯基苯甲酸酯、α-醯基肟酯、噻噸酮類等。 Examples of the photopolymerization initiator include acetophenone, benzophenone, mirenone, benzoin, benzylmethyl ketal, benzamyl benzoate, α-fluorenyl oxime ester, and thioxanthone Class, etc.

又，光聚合促進劑係可減輕因硬化時之空氣導致之聚合障礙而加速硬化速度者，例如列舉p-二甲基胺基苯甲酸異戊酯、p-二甲基胺基苯甲酸乙酯等。 In addition, the photopolymerization accelerator can reduce the polymerization obstacle caused by the air at the time of hardening and accelerate the hardening speed. Examples include p-dimethylaminobenzoic acid isoamyl p-dimethylaminobenzoic acid ethyl ester. Wait.

作為熱硬化性樹脂，可列舉矽氧系樹脂、酚系樹脂、尿素系樹脂、三聚氰胺系樹脂、呋喃系樹脂、不飽和聚酯系樹脂、環氧系樹脂、苯二甲酸二烯丙酯系樹脂、胍胺(Guanamine)系樹脂、酮系樹脂、胺基醇酸系樹脂、胺基甲酸乙酯系樹脂、丙烯酸系樹脂、聚碳酸脂系樹脂等。此等雖然可單獨使用，但為了更加提昇交聯性、交聯硬化塗膜的硬度，期望能加入硬化劑。 Examples of the thermosetting resin include a silicone resin, a phenol resin, a urea resin, a melamine resin, a furan resin, an unsaturated polyester resin, an epoxy resin, and a diallyl phthalate resin. , Guanamine resin, ketone resin, amino alkyd resin, urethane resin, acrylic resin, polycarbonate resin, etc. Although these can be used alone, in order to further improve the crosslinkability and the hardness of the crosslinked cured coating film, it is desirable to add a hardener.

作為硬化劑，可將聚異氰酸酯、胺基樹脂、環氧樹脂、羧酸等之化合物配合適合之樹脂適當使用。 As the hardener, compounds such as polyisocyanate, amine resin, epoxy resin, and carboxylic acid can be appropriately used in combination with a suitable resin.

作為熱塑性樹脂，ABS樹脂、降莰烯樹脂、矽氧系樹脂、尼龍系樹脂、聚縮醛系樹脂、聚碳酸脂系樹脂、改質聚苯醚(Polyphenylene ether)樹脂、聚對苯二甲酸丁二酯、聚對苯二甲酸乙二酯、碸系樹脂、醯亞胺系樹脂、氟系樹脂、苯乙烯系樹脂、丙烯酸系樹脂、氯乙烯系樹脂、乙酸乙烯酯系樹脂、氯乙烯-乙酸乙烯酯共聚物系樹脂、聚酯系樹脂、胺基甲酸乙酯系樹脂、橡膠系樹脂、聚乙烯醚、聚乙烯醇、聚乙烯縮丁醛、聚乙烯基吡咯烷酮、聚乙二醇等。 As thermoplastic resins, ABS resin, norbornene resin, silicone resin, nylon resin, polyacetal resin, polycarbonate resin, modified polyphenylene ether resin, polybutylene terephthalate Diester, polyethylene terephthalate, fluorene resin, fluorene resin, fluorine resin, styrene resin, acrylic resin, vinyl chloride resin, vinyl acetate resin, vinyl chloride-acetic acid Vinyl ester copolymer resin, polyester resin, urethane resin, rubber resin, polyvinyl ether, polyvinyl alcohol, polyvinyl butyral, polyvinyl pyrrolidone, polyethylene glycol, and the like.

尚，從作為樹脂層時之塗膜強度、或得到良好之透明性的觀點來看，此等電離放射線硬化性樹脂、熱硬化性樹脂或熱塑性樹脂當中，較佳為使用丙烯酸系樹脂之熱硬化性樹脂或熱塑性樹脂。又，此等熱硬化性樹脂或熱塑性樹脂亦可作為個別組合複數種之複合樹脂來使用。 Among these ionizing radiation-curable resins, thermosetting resins, or thermoplastic resins, thermosetting using an acrylic resin is preferred from the viewpoint of coating film strength when used as a resin layer or obtaining good transparency. Resin or thermoplastic resin. In addition, these thermosetting resins or thermoplastic resins can also be used as a composite resin in which plural kinds are individually combined.

又黏結劑樹脂，藉由調整玻璃轉移溫度(Tg)，可調整光擴散層的性質。例如由於光擴散層所包含之無機微粒子的種類，量大時由於易產生捲曲，從防止捲曲的觀點來看，黏結劑樹脂以玻璃轉移溫度(Tg)低者較佳。具體而言，玻璃轉移溫度(Tg)低者係玻璃轉移溫度為30℃以下，較佳為20℃以下者。另外，使用玻璃轉移溫度高之黏結劑樹脂時，可提高光擴散性薄片的正面亮度。從如此的觀點來看，黏結劑樹脂以包含玻璃轉移溫度(Tg)高者較佳。具體而言，玻璃轉移溫度(Tg)高者係玻璃轉移溫度為40℃以上，較佳為50℃以上者。作為具有上述玻璃轉移溫度(Tg)之黏結劑樹脂，較佳為丙烯酸多元醇樹脂。 In addition, the adhesive resin can adjust the properties of the light diffusion layer by adjusting the glass transition temperature (Tg). For example, due to the type of inorganic fine particles contained in the light diffusion layer, curling tends to occur when the amount is large. From the viewpoint of preventing curling, it is preferable that the binder resin has a low glass transition temperature (Tg). Specifically, the one with a low glass transition temperature (Tg) is the one with a glass transition temperature of 30 ° C or lower, preferably 20 ° C or lower. In addition, when a binder resin having a high glass transition temperature is used, the front brightness of the light-diffusing sheet can be improved. From such a viewpoint, it is preferable that the binder resin contains a high glass transition temperature (Tg). Specifically, the one with a higher glass transition temperature (Tg) is one having a glass transition temperature of 40 ° C or higher, and preferably 50 ° C or higher. As the binder resin having the above-mentioned glass transition temperature (Tg), an acrylic polyol resin is preferable.

黏結劑樹脂的玻璃轉移溫度(Tg)，例如以丙烯酸多元醇樹脂來說，可藉由適當變更樹脂中之丙烯酸系成分或苯乙烯系成分等之單體成分的種類或比例等來調整。例如，苯乙烯之均聚物的玻璃轉移溫度為100℃，藉由選擇與其共聚合之丙烯酸系單體，可調整玻璃轉移溫度。又丙烯酸系單體中，已知有玻璃轉移溫度為0℃以下者至100℃以上者，藉由選擇丙烯酸系成分的種類，可調 整玻璃轉移溫度。作為一例，苯乙烯(St)：甲基丙烯酸甲酯(MMA)：丙烯酸丁酯(BA)=20：55：25之玻璃轉移溫度雖為46.2℃(計算值)，但即使同一單體組成成為St：MMA：BA=20：70：10時，亦可成為78.5℃(計算值)。 The glass transition temperature (Tg) of the binder resin can be adjusted, for example, by using an acrylic polyol resin, by appropriately changing the type or ratio of monomer components such as an acrylic component or a styrene component in the resin. For example, the glass transition temperature of a homopolymer of styrene is 100 ° C, and the glass transition temperature can be adjusted by selecting an acrylic monomer to be copolymerized therewith. Also, acrylic monomers are known to have a glass transition temperature of 0 ° C or lower to 100 ° C or higher, and can be adjusted by selecting the type of acrylic component. Whole glass transfer temperature. As an example, although the glass transition temperature of styrene (St): methyl methacrylate (MMA): butyl acrylate (BA) = 20: 55: 25 is 46.2 ° C (calculated value), even if the same monomer composition becomes When St: MMA: BA = 20: 70: 10, it can also be 78.5 ° C (calculated value).

作為丙烯酸系成分的單體，可將甲基丙烯酸甲酯、甲基丙烯酸乙酯等之甲基丙烯酸酯系單體、丙烯酸甲酯、丙烯酸乙酯等之丙烯酸酯系單體、羥基甲基丙烯酸乙酯、丙烯醯胺等作為其代表例例示，作為苯乙烯系單體，可將苯乙烯、α-甲基苯乙烯、乙烯基甲苯等作為其代表例例示。若此等單體的共聚合，將此等作為主成分，如有必要可與其他單體共聚合，可為接枝聚合苯乙烯系單體於丙烯酸系樹脂的側鏈、或可為接枝聚合丙烯酸系單體於苯乙烯系樹脂的側鏈者。 Examples of the monomer of the acrylic component include methacrylate monomers such as methyl methacrylate and ethyl methacrylate, acrylate monomers such as methyl acrylate and ethyl acrylate, and hydroxymethacrylic acid. Ethyl ester, acrylamide, and the like are exemplified as representative examples, and as styrene-based monomers, styrene, α-methylstyrene, vinyltoluene, and the like are exemplified as representative examples. If these monomers are copolymerized, these are used as the main component, and if necessary, they can be copolymerized with other monomers. It may be a graft polymerized styrene monomer on the side chain of an acrylic resin, or it may be grafted. Polymerization of acrylic monomers on the side chain of a styrene resin.

作為市售之玻璃轉移溫度30℃以下的丙烯酸多元醇樹脂，例如例示DIC公司之商品名ACRYDIC A811(Tg：19℃)、商品名ACRYDIC 49-394IM(Tg：16℃)、商品名ACRYDIC 52-614(Tg：16℃)、商品名ACRYDIC 48-261(Tg：30℃)等。 As commercially available acrylic polyol resins having a glass transition temperature of 30 ° C or lower, for example, DIC Corporation's trade name ACRYDIC A811 (Tg: 19 ° C), trade name ACRYDIC 49-394IM (Tg: 16 ° C), trade name ACRYDIC 52- 614 (Tg: 16 ° C), trade name ACRYDIC 48-261 (Tg: 30 ° C), and the like.

另外，作為市售之玻璃轉移溫度40℃以上的丙烯酸多元醇樹脂，例如例示DIC公司之商品名ACRYDIC A817(Tg：96℃)、商品名ACRYDIC A814(Tg：87℃)、商品名ACRYDIC A815-45(Tg：101℃)、商品名ACRYDIC A808(Tg：70℃)等。 Examples of commercially available acrylic polyol resins having a glass transition temperature of 40 ° C or higher include, for example, the trade name ACRYDIC A817 (Tg: 96 ° C), trade name ACRYDIC A814 (Tg: 87 ° C), and trade name ACRYDIC A815- 45 (Tg: 101 ° C), trade name ACRYDIC A808 (Tg: 70 ° C), and the like.

於本實施形態適合之態樣，作為低的玻璃轉移溫度(Tg)，黏結劑樹脂係包含玻璃轉移溫度為30℃以下之丙烯酸多元醇樹脂。又，黏結劑樹脂除了低玻璃轉移溫度的黏結劑樹脂，作為高玻璃轉移溫度的黏結劑樹脂，可包含玻璃轉移溫度為40℃以上之丙烯酸多元醇樹脂。 In a form suitable for this embodiment, as the low glass transition temperature (Tg), the binder resin includes an acrylic polyol resin having a glass transition temperature of 30 ° C. or lower. The binder resin may include an acrylic polyol resin having a glass transition temperature of 40 ° C. or higher as the binder resin having a high glass transition temperature, in addition to a binder resin having a low glass transition temperature.

併用玻璃轉移溫度(Tg)低之樹脂與玻璃轉移溫度高之樹脂時，兩者的混合期望為以樹脂(固體含量)的混合比，具有高玻璃轉移溫度之樹脂：具有低玻璃轉移溫度之樹脂的比為5：5至0：10的範圍。換言之，黏結劑樹脂係玻璃轉移溫度低之樹脂(固體含量)與高之樹脂(固體含量)的合計為100重量份時，期望包含玻璃轉移溫度低之樹脂為50重量份以上。例如，玻璃轉移溫度為30℃以下之丙烯酸多元醇樹脂與玻璃轉移溫度為40℃以上之丙烯酸多元醇樹脂的合計為100重量份時，較佳係玻璃轉移溫度為30℃以下之丙烯酸多元醇樹脂為50重量份以上。 When a resin with a low glass transition temperature (Tg) and a resin with a high glass transition temperature are used together, it is expected that the mixture of the two is a resin with a high glass transition temperature based on the resin (solid content) mixing ratio: a resin with a low glass transition temperature The ratio is in the range of 5: 5 to 0:10. In other words, when the total of the resin (solid content) with a low glass transition temperature and the high resin (solid content) of the binder resin is 100 parts by weight, it is desirable that the resin containing a low glass transition temperature is 50 parts by weight or more. For example, when the total amount of the acrylic polyol resin having a glass transition temperature of 30 ° C or lower and the acrylic polyol resin having a glass transition temperature of 40 ° C or higher is 100 parts by weight, an acrylic polyol resin having a glass transition temperature of 30 ° C or lower is preferred. It is 50 parts by weight or more.

其次，作為光擴散性樹脂粒子，一般可使用作為光擴散性樹脂粒子使用之材料，具體而言，亦可使用苯乙烯樹脂、胺基甲酸乙酯樹脂、尼龍樹脂、苯胍胺樹脂、矽氧樹脂、丙烯酸樹脂等之樹脂粒子。此等當中，從光透過性高、提昇亮度性能的觀點來看，以使用丙烯酸樹脂較佳。此等粒子不僅1種，亦可組合複數種使用。 Secondly, as the light diffusing resin particles, materials generally used as the light diffusing resin particles can be generally used. Specifically, styrene resin, urethane resin, nylon resin, benzoguanamine resin, and silicone can also be used. Resin, acrylic resin and other resin particles. Among these, it is preferable to use an acrylic resin from the viewpoint of high light transmittance and improvement in brightness performance. These particles can be used in combination of not only one type but also a plurality of types.

光擴散性樹脂粒子的大小，較佳為平均粒徑 為0.5~10μm者，更佳為1~8μm者。藉由將平均粒徑定為10μm以下，可使光擴散性薄片變薄，藉由成為0.5μm以上，可使光擴散性、正面亮度變良好。尤其是作為光擴散性樹脂粒子，僅使用平均粒徑為一種者時，更佳為平均粒徑1~4μm者。 The size of the light-diffusing resin particles is preferably an average particle diameter It is 0.5 to 10 μm, and more preferably 1 to 8 μm. When the average particle diameter is 10 μm or less, the light-diffusing sheet can be made thin, and when it is 0.5 μm or more, the light-diffusibility and frontal brightness can be made good. In particular, when only one type of the average particle diameter is used as the light-diffusing resin particles, the average particle diameter is more preferably 1 to 4 μm.

又，組合平均粒徑不同之二種以上光擴散性樹脂粒子使用時，較佳為組合平均粒徑1~4μm之粒子、與較其平均粒徑更大之粒子。作為平均粒徑大之粒子，較佳為平均粒徑為4~10μm者，更佳為5~8μm者。認為藉由加入平均粒徑比較大之粒子，抑制因異物等導致之光擴散層的負傷。組合兩者時之平均粒徑大之粒子的比例，較佳為與平均粒徑小之粒子同量或其以下，尤其是以小之粒子：大之粒子的比為100：40~100：60的範圍較佳。 When two or more kinds of light-diffusing resin particles having different average particle diameters are used, it is preferable to combine particles having an average particle diameter of 1 to 4 μm and particles larger than the average particle diameter. The particles having a large average particle diameter are preferably those having an average particle diameter of 4 to 10 μm, and more preferably 5 to 8 μm. It is considered that by adding particles having a relatively large average particle diameter, damage to the light diffusion layer due to foreign matter or the like is suppressed. The ratio of particles with a large average particle size when combining the two is preferably the same as or less than the particles with a small average particle size, especially the ratio of small particles to large particles is 100: 40 ~ 100: 60 The range is better.

又，光擴散性樹脂粒子的形狀雖然不是被特別限定者，但較佳為接近真球狀粒子者。藉由如此之形狀，可提昇正面亮度。 The shape of the light-diffusing resin particles is not particularly limited, but is preferably one close to true spherical particles. With such a shape, frontal brightness can be enhanced.

光擴散性樹脂粒子的折射率雖然不是被特別限定者，但較佳為與黏結劑樹脂的折射率差小者。黏結劑樹脂與粒子的折射率差較佳為0.03以下，更佳為0.02以下。藉由成為如此之範圍，易減少因光擴散層內之內部霧值導致之光線透過損失。由於上述之黏結劑樹脂的折射率約為1.43~1.57，光擴散性樹脂粒子的折射率具體而言較佳為1.40~1.60，更佳為1.45~1.55。 Although the refractive index of the light-diffusing resin particles is not particularly limited, it is preferably one having a small refractive index difference from the binder resin. The refractive index difference between the binder resin and the particles is preferably 0.03 or less, and more preferably 0.02 or less. By setting it as such a range, it is easy to reduce the light transmission loss due to the internal haze value in the light diffusion layer. Since the refractive index of the binder resin is about 1.43 to 1.57, the refractive index of the light diffusing resin particles is specifically preferably 1.40 to 1.60, and more preferably 1.45 to 1.55.

對於黏結劑樹脂之光擴散性樹脂粒子的含有 比例，雖亦因平均粒徑而不同，但相對於黏結劑樹脂(固體含量)100重量份，較佳為60~220重量份，更佳為80~200重量份。對於上述之平均粒徑小之粒子，為了使其發揮成必要之光擴散性，相對於黏結劑樹脂(固體含量)100重量份，較佳為60~180重量份。進而從正面亮度提昇的觀點來看，更佳為含有80~120重量份。光擴散性作為主要由於係藉由平均粒徑小之粒子的添加而發揮，平均粒徑大之粒子，若為相對於上述小的粒子之比例的範圍(同量以下)，180重量份的含有比例可不受限制加入。 Containing light diffusing resin particles of binder resin Although the ratio varies depending on the average particle diameter, it is preferably 60 to 220 parts by weight, and more preferably 80 to 200 parts by weight based on 100 parts by weight of the binder resin (solid content). The particles having a small average particle size are preferably 60 to 180 parts by weight with respect to 100 parts by weight of the binder resin (solid content) in order to exhibit necessary light diffusibility. From the standpoint of improvement in frontal brightness, it is more preferable to contain 80 to 120 parts by weight. The light diffusivity is mainly exerted by the addition of particles having a small average particle diameter. If the particles having a large average particle diameter are in a range of the proportion of the small particles (the same amount or less), the content of 180 parts by weight is contained. The proportion can be added without restriction.

無機微粒子係為了得到不使亮度降低之特定Y值而添加者，較佳為較黏結劑樹脂之折射率更高之無機微粒子，特佳為高折射率金屬氧化物或金屬鹽。無機微粒子的折射率較佳為1.9以上，更佳為2.0以上，特佳為2.3以上。提高折射率時，可提高光的反射率，即使減低無機微粒子的添加量亦可實現低的Y值。又藉由減低無機微粒子的添加量，將光擴散層形成於支撐體上時，可保持對於支撐體之光擴散層之良好接著性。 The inorganic fine particles are added in order to obtain a specific Y value that does not reduce the brightness. Inorganic fine particles are preferably inorganic fine particles having a higher refractive index than the binder resin, and particularly preferably a high refractive index metal oxide or metal salt. The refractive index of the inorganic fine particles is preferably 1.9 or more, more preferably 2.0 or more, and particularly preferably 2.3 or more. When the refractive index is increased, the reflectance of light can be increased, and even if the amount of inorganic fine particles is reduced, a low Y value can be achieved. In addition, by reducing the amount of the inorganic fine particles added, when the light diffusion layer is formed on the support, good adhesion to the light diffusion layer of the support can be maintained.

作為高折射率金屬氧化物或金屬鹽，適合使用羥基碳酸鉛(2PbCO3Pb(OH)2)(折射率1.94~2.09)、氧化鈦(折射率2.71)、氧化鋯(折射率2.4)、氧化鋅(折射率1.95)、氧化鋁(折射率1.76)等。 As the high-refractive-index metal oxide or metal salt, lead hydroxycarbonate (2PbCO 3 Pb (OH) 2 ) (refractive index 1.94 to 2.09), titanium oxide (refractive index 2.71), zirconia (refractive index 2.4), oxidation Zinc (refractive index 1.95), alumina (refractive index 1.76), and the like.

又無機微粒子較佳為於光擴散層塗膜中呈現白色者。藉由使用呈現白色之無機微粒子，光擴散性薄片 呈現白色，減低背光裝置光源附近的亮度不均，可提高將導光板末端部分的漏光變不明顯的效果。作為呈現白色度之無機微粒子，上述之無機微粒子當中，特別適合氧化鋯、氧化鈦、氧化鋅，其中最適合氧化鋯及氧化鈦。 The inorganic fine particles are preferably those which appear white in the coating film of the light diffusion layer. Light-diffusing sheet by using white inorganic fine particles It is white, reduces uneven brightness near the light source of the backlight device, and can improve the effect of making the light leakage at the end of the light guide plate inconspicuous. As the inorganic fine particles exhibiting whiteness, among the above-mentioned inorganic fine particles, zirconia, titanium oxide, and zinc oxide are particularly suitable, and among them, zirconia and titanium oxide are most suitable.

上述之高折射率金屬氧化物或金屬鹽、或白色無機微粒子，不僅1種，亦可組合複數種使用。藉由組合複數種，變成易調整作為無機微粒子整體之含量、或作為其結果之Y值或其以外之光擴散層塗膜的性質，例如對於支撐體之接著性或捲曲防止性等。 The above-mentioned high-refractive-index metal oxides or metal salts, or white inorganic fine particles may be used in combination of not only one type but also a plurality of types. By combining a plurality of types, it becomes easy to adjust the content of the inorganic fine particles as a whole, or the result of the Y value or other properties of the light diffusing layer coating film, such as adhesion to the support or curling prevention properties.

無機微粒子之一次粒徑雖然不是被特別限定者，但可使用10~50nm者。如此nm量級的微粒子，以分散於光擴散層之狀態幾乎被作為凝聚體包含在光擴散層。藉由將無機微粒子作為凝聚體包含，除了變易於得到特定之Y值之外，由於不需過度之分散步驟故提昇溶液製造步驟。作為凝聚體之平均粒徑(二次粒徑)，從藉由具有特定之Y值或特定之白色度，極力抑制亮度的下降且得到高的擴散性的觀點來看，較佳為100~2000nm，更佳為400~1000nm。尚光擴散層中之凝聚體的粒徑，可將塗膜剖面等藉由透射電子顯微鏡(TEM)測定。 Although the primary particle diameter of the inorganic fine particles is not particularly limited, a particle size of 10 to 50 nm can be used. Particles on the order of nm are almost contained in the light diffusion layer as aggregates in a state of being dispersed in the light diffusion layer. By including the inorganic fine particles as aggregates, in addition to making it easy to obtain a specific Y value, an excessive dispersion step is not required, so that the solution production step is improved. The average particle diameter (secondary particle diameter) of the aggregate is preferably from 100 to 2000 nm from the viewpoint of suppressing the decrease in brightness as much as possible while having a specific Y value or specific whiteness. , More preferably 400 ~ 1000nm. The particle diameter of the aggregates in the light diffusion layer can be measured by a transmission electron microscope (TEM) by measuring the cross-section of the coating film and the like.

為了得到所期望之Y值，相對於無機微粒子之黏結劑樹脂(固體含量)100重量份的摻合量，雖因無機微粒子的種類而不同，但較佳為40重量份以上~480重量份以下，更佳為120重量份以上~320重量份以下，再更佳為160重量份以上~240重量份以下。 In order to obtain the desired Y value, the blending amount with respect to 100 parts by weight of the binder resin (solid content) of the inorganic fine particles is preferably 40 to 480 parts by weight, although it varies depending on the type of the inorganic fine particles. , More preferably 120 parts by weight to 320 parts by weight, and even more preferably 160 parts by weight to 240 parts by weight.

無機微粒子為氧化鋯時，相對於無機微粒子之黏結劑樹脂(固體含量)100重量份之摻合量的下限值，較佳為120重量份以上，更佳為140重量份以上，再更佳為160重量份以上，上限值較佳為320重量份以下，更佳為280重量份以下，再更佳為240重量份以下。藉由成為120重量份以上，改善亮度的均一化。藉由成為320重量份以下，防止Y值過低。 When the inorganic fine particles are zirconia, the lower limit of the blending amount with respect to 100 parts by weight of the binder resin (solid content) of the inorganic fine particles is preferably 120 parts by weight or more, more preferably 140 parts by weight or more, and even more preferably It is 160 parts by weight or more, and the upper limit is preferably 320 parts by weight or less, more preferably 280 parts by weight or less, and still more preferably 240 parts by weight or less. When it is 120 parts by weight or more, uniformity of brightness is improved. By being 320 parts by weight or less, the Y value is prevented from being too low.

無機微粒子為氧化鈦時，相對於無機微粒子之黏結劑樹脂(固體含量)100重量份之摻合量的下限值，較佳為40重量份以上，更佳為50重量份以上，上限值較佳為130重量份以下，更佳為120重量份以下，再更佳為110重量份以下。藉由成為40重量份以上，改善亮度的均一化。藉由成為130重量份以下，防止光擴散層著色成黃色。 When the inorganic fine particles are titanium oxide, the lower limit value of the blending amount with respect to 100 parts by weight of the binder resin (solid content) of the inorganic fine particles is preferably 40 parts by weight or more, more preferably 50 parts by weight or more, and the upper limit value. It is preferably 130 parts by weight or less, more preferably 120 parts by weight or less, and still more preferably 110 parts by weight or less. When it is 40 parts by weight or more, uniformity of brightness is improved. When it is 130 parts by weight or less, the light diffusion layer is prevented from being colored yellow.

無機微粒子為氧化鋅時，相對於無機微粒子之黏結劑樹脂(固體含量)100重量份之摻合量的下限值，較佳為200重量份以上，更佳為220重量份以上，再更佳為240重量份以上，上限值較佳為480重量份以下，更佳為420重量份以下，再更佳為360重量份以下。藉由成為200重量份以上，改善亮度的均一化。藉由成為480重量份以下，防止光擴散性薄片的捲曲顯著發生。 When the inorganic fine particles are zinc oxide, the lower limit of the blending amount with respect to 100 parts by weight of the binder resin (solid content) of the inorganic fine particles is preferably 200 parts by weight or more, more preferably 220 parts by weight or more, and even more preferably It is 240 parts by weight or more, and the upper limit value is preferably 480 parts by weight or less, more preferably 420 parts by weight or less, and even more preferably 360 parts by weight or less. When it is 200 parts by weight or more, uniformity of brightness is improved. When it is 480 parts by weight or less, curling of the light-diffusing sheet is prevented from occurring significantly.

尚如上述，由於因無機微粒子之種類而使適合之摻合量的範圍脫離，組合複數種之無機微粒子使用時，無機微粒子整體之摻合量的範圍，因應個別的配合比 若為中間範圍即可。作為一例，併用氧化鋯與氧化鈦時，以兩者的合計相對於黏結劑樹脂(固體含量)100重量份，較佳成為80~200重量份，更佳成為100~180重量份。 As described above, due to the type of inorganic fine particles, the range of the suitable blending amount is deviated. When a plurality of types of inorganic fine particles are used in combination, the range of the total blending amount of the inorganic fine particles depends on the individual mixing ratio. It is sufficient if it is in the middle range. As an example, when zirconia and titanium oxide are used in combination, it is preferably 80 to 200 parts by weight, and more preferably 100 to 180 parts by weight with respect to 100 parts by weight of the binder resin (solid content).

光擴散層中，除了上述之黏結劑樹脂、光擴散性樹脂粒子、無機微粒子之外，可添加整平劑．消泡劑等之界面活性劑、抗氧化劑、紫外線吸收劑等之添加劑。 In the light diffusing layer, in addition to the above-mentioned binder resin, light diffusing resin particles, and inorganic fine particles, a leveling agent may be added. Additives such as defoamers, surfactants, antioxidants, UV absorbers, etc.

光擴散層的厚度係將本發明的光擴散性薄片以光擴散層單層構成時，較佳係成為10~500μm，更佳為10~250μm。藉由將厚度定為10μm以上，可使塗膜強度成為充分者，又，可使操作性成為良好者。另外，藉由將厚度定為500μm以下，可使光擴散層的透明性成為良好者。又，形成光擴散層於支撐體上時，從發揮光擴散性能而且易得到本發明的所期望之出射特性的觀點來看，較佳係成為2~20μm，更佳成為3~15μm。尚，所謂光擴散層的厚度，係指從光擴散層之凹凸面之凸部的先端，至與凹凸面相反面的光擴散層表面為止的厚度。 The thickness of the light diffusing layer is preferably 10 to 500 μm, and more preferably 10 to 250 μm when the light diffusing sheet of the present invention is configured as a single layer of a light diffusing layer. By setting the thickness to be 10 μm or more, the strength of the coating film can be made sufficient, and the operability can be made good. In addition, by setting the thickness to 500 μm or less, the transparency of the light diffusion layer can be made good. Moreover, when forming a light-diffusion layer on a support body, it is preferable that it is 2-20 micrometers, and it is more preferable that it is 3-15 micrometers from a viewpoint which exhibits light-diffusion performance and can easily obtain the desired emission characteristic of this invention. The thickness of the light diffusion layer refers to the thickness from the tip of the convex portion of the uneven surface of the light diffusion layer to the surface of the light diffusion layer opposite to the uneven surface.

本發明的光擴散性薄片具有支撐體時，只要不背離Y值的範圍，支撐體若為光學性透明性高之塑膠薄膜，則並未特別限制可予以使用。例如可使用聚對苯二甲酸乙二酯、聚對苯二甲酸丁二酯、聚萘二甲酸乙二酯、聚碳酸脂、聚乙烯、聚丙烯、聚苯乙烯、三乙醯纖維素、丙烯醯基、聚氯乙烯、降莰烯化合物等。當中，經拉延加工、尤其是經二軸拉延加工之聚對苯二甲酸乙二酯薄膜， 於機械性強度或尺寸安定性優異的點來看較佳。又，為了提昇與光擴散層的接著性，於表面實施電暈放電處理、或亦適合用在設置易接著層者。尚，支撐體的厚度通常以10~400μm左右較佳。 When the light diffusing sheet of the present invention has a support, as long as the support is a plastic film with high optical transparency without departing from the range of the Y value, it is not particularly limited and can be used. For example, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polycarbonate, polyethylene, polypropylene, polystyrene, triethyl cellulose, propylene can be used Fluorenyl, polyvinyl chloride, norbornene compounds, etc. Among them, polyethylene terephthalate film which has been drawn, especially biaxially drawn, It is preferable from the point which is excellent in mechanical strength or dimensional stability. In addition, in order to improve the adhesion with the light diffusion layer, a corona discharge treatment is performed on the surface, or it is also suitable for use in a case where an easy-adhesion layer is provided. The thickness of the support is usually about 10 to 400 μm.

又，與本發明的光擴散性薄片表面的凹凸面相反側的面，為了防止與其他構件的密著，而實施微去光澤處理(matt processing)、或為了提昇光透過率可實施抗反射處理。進而藉由如下述之塗佈乾燥方法，可設置背塗層或防靜電層(未示於圖1)或黏著層(未示於圖1)。 In addition, the surface on the opposite side to the uneven surface of the surface of the light diffusing sheet of the present invention may be subjected to matt processing in order to prevent adhesion with other members, or anti-reflection treatment may be performed in order to improve light transmittance. . Furthermore, a back coating layer, an antistatic layer (not shown in FIG. 1), or an adhesive layer (not shown in FIG. 1) can be provided by a coating and drying method as described below.

背塗層之基本機能，可防止與對向之構件的密著，進而可一併具有對對向之構件的防受傷性、或擴散性。如此之背塗層，係於表面具有凹凸形狀者，例如係包含黏結劑樹脂及粒子等而構成。黏結劑樹脂及粒子可使用與於上述之光擴散性薄片的光擴散層所使用之黏結劑樹脂及粒子相同者，因應背塗層所賦予之機能，較佳為使用適當之材料、適當之量。 The basic function of the back coating can prevent the adhesion with the opposing members, and can also have the anti-injury or diffusion properties of the opposing members. Such a back coating layer is formed by a surface having a concave-convex shape, for example, it includes a binder resin and particles. As the binder resin and particles, it is possible to use the same binder resin and particles as those used in the light diffusion layer of the light diffusing sheet described above. Depending on the function imparted by the back coating layer, it is preferable to use an appropriate material and an appropriate amount .

例如除了密著防止性，亦兼用對對向之構件的防受傷性之背塗層時，於光擴散層所列舉者當中，尼龍樹脂粒子及/或矽氧樹脂粒子從下述的觀點來看較佳。此等之樹脂粒子不僅單獨亦可適當組合使用。又作為黏結劑樹脂，較佳為使用玻璃轉移溫度Tg為15~100℃之熱硬化性樹脂。相對於黏結劑樹脂(固體含量)100重量份，相對於在背塗層中之黏結劑樹脂之粒子的含有比例雖以成 為0.1~2重量份較佳，但亦可含有更多。 For example, in addition to adhesion prevention, and a back coating that also serves as an anti-traumatic member for opposing members, among the light diffusion layers, nylon resin particles and / or silicone resin particles are considered from the following viewpoints. Better. These resin particles may be used not only alone but also in appropriate combinations. As the binder resin, a thermosetting resin having a glass transition temperature Tg of 15 to 100 ° C is preferably used. With respect to 100 parts by weight of the binder resin (solid content), the content ratio of the particles relative to the binder resin in the back coating layer is It is preferably 0.1 to 2 parts by weight, but it may contain more.

防受傷性當中，從背光裝置使用時光擴散性薄片密著於導光板，該構件彼此藉由摩擦防止所產生之導光板的磨耗傷的觀點來看，特佳為尼龍樹脂粒子。尼龍樹脂粒子較佳係平均粒徑為1~10μm。又相對於熱硬化性樹脂100重量份，尼龍樹脂粒子之雖然較佳為含有0.1~2重量份，但亦可含有更多。 Among the anti-injury properties, nylon resin particles are particularly preferred from the viewpoint that the light-diffusing sheet adheres to the light guide plate when the backlight device is used, and the members prevent the abrasion and damage of the light guide plate by friction. The nylon resin particles preferably have an average particle diameter of 1 to 10 μm. The nylon resin particles preferably contain 0.1 to 2 parts by weight with respect to 100 parts by weight of the thermosetting resin, but may also contain more.

又，從將背光裝置以手指等加壓時，有效果地防止密著光擴散性薄片與導光板可引起導光板的刮傷(加壓傷)的觀點來看，較佳為矽氧樹脂粒子。矽氧樹脂粒子，較佳係平均粒徑為1~10μm。矽氧樹脂粒子特佳為由矽氧橡膠所成之球狀芯部係藉由矽氧樹脂膜所覆蓋之二元結構。為了防止加壓時之刮傷，相對於該熱硬化性樹脂100重量份，矽氧樹脂粒子雖然較佳為含有0.1~2重量份，但亦可含有更多。 In addition, from the viewpoint of effectively preventing the light-diffusing sheet and the light guide plate from being scratched (pressurized) when the backlight device is pressed with a finger or the like, silicone particles are preferred. . The silicone resin particles preferably have an average particle diameter of 1 to 10 μm. The silicone resin particles are particularly preferably a binary structure in which a spherical core made of silicone rubber is covered by a silicone resin film. In order to prevent scratches during pressing, the silicone resin particles are preferably contained in an amount of 0.1 to 2 parts by weight with respect to 100 parts by weight of the thermosetting resin, but may also contain more.

又，背塗層中，如上述，除了密著防止性亦可賦予光擴散性。此情況下，光擴散性背塗層之霧值，從維持正面亮度且提昇光擴散性的觀點來看，較佳為成為較光擴散層之霧值更低者。具體而言霧值較佳為50%~70%左右。又，關於在光擴散性背塗層中之黏結劑樹脂與粒子的含有比例，雖成為較在光擴散層中之黏結劑樹脂與粒子的含有比例，粒子之比例更低者，但從防止正面亮度降低的觀點來看較佳。 In addition, as described above, in addition to the adhesion prevention property, light diffusibility can be imparted to the back coat layer. In this case, the haze value of the light diffusive back coating layer is preferably lower than the haze value of the light diffusion layer from the viewpoint of maintaining frontal brightness and improving light diffusivity. Specifically, the haze value is preferably about 50% to 70%. In addition, the content ratio of the binder resin and the particles in the light diffusing back coating layer is lower than the content ratio of the binder resin and the particles in the light diffusing layer. It is preferable from the viewpoint of reduction in brightness.

背塗層的厚度一般而言以成為1~10μm較 佳。又，如有必要，亦可適當含有分散劑、防靜電劑、整平劑等之添加劑。 The thickness of the back coating is generally 1 to 10 μm. good. Further, if necessary, additives such as a dispersant, an antistatic agent, and a leveling agent may be appropriately contained.

防靜電層只要不背離Y值的範圍，一般者即可，防靜電層的厚度以成為0.1μm以下較佳。 As long as the antistatic layer does not deviate from the range of the Y value, the thickness of the antistatic layer is preferably 0.1 μm or less.

黏著層只要不背離Y值的範圍，一般者即可，黏著層的厚度以成為30μm以下較佳。 As long as the adhesive layer does not deviate from the range of the Y value, an ordinary one may be used. The thickness of the adhesive layer is preferably 30 μm or less.

本發明的光擴散性薄片係藉由自以往所周知之方法，可藉由將光擴散層用塗佈液、或如有必要所設置之背塗層用塗佈液等塗佈於支撐體上，再乾燥來製作，該光擴散層用塗佈液係將上述之黏結劑樹脂或粒子等之材料使其溶解、或分散於適當溶劑，而該自以往所周知之方法，例如藉由棒塗佈機、刮刀塗佈機、旋塗機、輥塗機、凹印塗佈機、流塗機、模塗機、噴塗、網板印刷等。又，從形成光擴散層於支撐體上者，藉由剝離去除該支撐體，可成為由光擴散層單層所成之光擴散性薄片。 The light-diffusing sheet of the present invention can be applied to a support by a method known from the past, by applying a coating liquid for a light-diffusing layer, or a coating liquid for a back-coat layer provided if necessary. And then dried to produce the coating liquid for the light diffusion layer, which dissolves or disperses the above-mentioned materials such as the binder resin or particles in an appropriate solvent, and the method known from the past, for example, by bar coating Cloth machine, blade coater, spin coater, roll coater, gravure coater, flow coater, die coater, spraying, screen printing, etc. In addition, from the case where the light diffusing layer is formed on the support, the support is removed by peeling to form a light diffusing sheet made of a single layer of the light diffusing layer.

本發明的光擴散性薄片根據JIS Z 8722：2000之D65光源的透過測定方法，藉由將Y值定為0.3以上且2.1以下，在背光裝置，可成為極力抑制亮度下降，且可改善局部性亮度不均及局部漏光之光擴散性薄片。測定之Y值過低時，由於遮光性提高，從得到充分亮度的觀點來看，Y值的下限值較佳為0.3以上，更佳為0.4以上，再更佳為0.45以上，特佳為0.5以上。另外，從改善局部性亮度不均及局部漏光的觀點來看，Y值的上限值較佳為2.1以下，更佳為1.8以下，再更佳為1.5以下，特佳為 1.2以下。 The light diffusing sheet of the present invention is a transmission measurement method of a D65 light source according to JIS Z 8722: 2000. By setting the Y value to be 0.3 or more and 2.1 or less, the backlight device can suppress the decrease in brightness as much as possible and improve locality. Light diffusing sheet with uneven brightness and local light leakage. When the measured Y value is too low, the lower limit of the Y value is preferably 0.3 or more, more preferably 0.4 or more, and even more preferably 0.45 or more, and particularly preferably, from the viewpoint of obtaining sufficient brightness due to improvement in light shielding properties. 0.5 or more. In addition, from the viewpoint of improving local brightness unevenness and local light leakage, the upper limit of the Y value is preferably 2.1 or less, more preferably 1.8 or less, even more preferably 1.5 or less, and particularly preferably 1.2 or less.

作為背光裝置，合併本發明的光擴散性薄片時，使來自光源的光不會附有顏色，本發明的光擴散性薄片較佳為所謂白色。為了使光擴散性薄片成為白色，如前述，無機微粒子較佳為於光擴散層塗膜中呈現白色者。本發明的光擴散性薄片的白色度較佳之範圍，藉由JIS Z 8722：2000之D65光源的透過測定方法，作為Yxy之x值的下限，較佳為0.30以上，更佳為0.31以上，作為y值的下限，較佳為0.31以上，更佳為0.32以上，作為x值的上限，較佳為0.36以下，更佳為0.35以下，作為y值的上限，較佳為0.37以下，更佳為0.36以下。 When the light diffusing sheet of the present invention is incorporated as a backlight device, the light from the light source is not colored, and the light diffusing sheet of the present invention is preferably so-called white. In order to make the light-diffusing sheet white, as described above, the inorganic fine particles are preferably those which appear white in the light-diffusing layer coating film. The preferable range of the whiteness of the light-diffusing sheet of the present invention is determined by the transmission method of D65 light source of JIS Z 8722: 2000. As the lower limit of the x value of Yxy, it is preferably 0.30 or more, more preferably 0.31 or more. The lower limit of the y value is preferably 0.31 or more, more preferably 0.32 or more, and the upper limit of the x value is preferably 0.36 or less, more preferably 0.35 or less. As the upper limit of the y value, preferably 0.37 or less, more preferably 0.36 or less.

本發明的光擴散性薄片根據JIS K 7105測定方法所測定之全光線透過率的範圍，下限值較佳為45%以上，更佳為54%以上，再更佳為60%以上。另外，上限值，較佳為88%以下，更佳為84%以下，再更佳為80%以下。本發明的光擴散性薄片隨著將Y值抑制在低，全光線透過率雖下降，但納入背光裝置時的亮度值與全光線透過率高者相比較幾乎未降低。此理由被認為如以下。本發明的光擴散性薄片藉由Y值的降低，導致白色度增強，全光線透過率本身降低。另外，將本發明的光擴散性薄片納入背光裝置時，入射於該薄片之光線係以分散於光擴散層之多數無機微粒子的表面重複反射。認為本發明所使用之無機微粒子已具有高折射率性，亦即已具有高反射性，且於該微粒子部分之光的透過或吸收幾乎未產生，重複反射之 入射光，最初即使無法向正面方向出射，於重複反射之間，向正面方向出射、或以設置於背光裝置內面之反射薄片36反射，結果認為由於入射之光線幾乎全部無損失向正面方向出射，正面亮度維持居高不下。 The lower limit of the total light transmittance of the light diffusing sheet of the present invention measured in accordance with the JIS K 7105 measurement method is preferably 45% or more, more preferably 54% or more, and still more preferably 60% or more. The upper limit value is preferably 88% or less, more preferably 84% or less, and even more preferably 80% or less. As the light diffusing sheet of the present invention suppresses the Y value to be low, the total light transmittance decreases, but the brightness value when incorporated in a backlight device is hardly reduced compared to the one having a high total light transmittance. This reason is considered as follows. The reduction of the Y value of the light-diffusing sheet of the present invention results in an increase in whiteness and a decrease in total light transmittance itself. In addition, when the light-diffusing sheet of the present invention is incorporated into a backlight device, the light incident on the sheet is repeatedly reflected on the surface of most of the inorganic fine particles dispersed in the light-diffusing layer. It is considered that the inorganic fine particles used in the present invention have high refractive index, that is, they have high reflectivity, and transmission or absorption of light in the fine particle portion is hardly generated. Even if the incident light cannot be emitted in the front direction at first, it is emitted in the front direction between repeated reflections, or reflected by the reflective sheet 36 provided on the inner surface of the backlight device. , The front brightness remains high.

其次，對於使用本發明的光擴散性薄片之背光裝置進行說明。背光裝置在直下型之結構或邊光型之結構的任一種皆可適用。又，大型或小型的液晶顯示的任一種皆可適用。 Next, a backlight device using the light-diffusing sheet of the present invention will be described. The backlight device can be applied to either a direct type structure or an edge type structure. In addition, any large or small liquid crystal display is applicable.

圖2表示作為使用本發明的光擴散性薄片之背光裝置之一實施形態之邊光型的背光裝置30。此背光裝置作為主要構成，係具備：導光板35、與配置於其一末端部分之光源34、與配置於導光板35之下的反射薄片36、與配置於導光板35之上的光擴散性薄片33、棱鏡薄片31、32。尚，於圖2，雖表示光擴散性薄片33使用1枚、棱鏡薄片31及32使用2枚的情況，但可分別僅使用1枚，亦可重疊數枚使用。 FIG. 2 shows an edge-light-type backlight device 30 as an embodiment of a backlight device using the light-diffusing sheet of the present invention. This backlight device is mainly composed of a light guide plate 35, a light source 34 disposed at one end portion thereof, a reflective sheet 36 disposed below the light guide plate 35, and light diffusivity disposed above the light guide plate 35. The sheet 33 and the prism sheets 31 and 32. Although FIG. 2 shows a case where one light-diffusing sheet 33 is used and two prism sheets 31 and 32 are used, only one sheet may be used, or a plurality of sheets may be used.

導光板35係由將至少一個的側面作為光入射面，與將此略垂直一側的面作為光出射面的方式所成形之略平板狀所成者，作為主要係由選自聚甲基丙烯酸甲酯、聚碳酸脂或非晶質烯烴系樹脂等之高透明樹脂的基質樹脂所成。如有必要可添加與基質樹脂折射率不同之樹脂粒子。導光板的各面即使並非一樣的平面而是成為複雜之表面形狀者，亦可設置圓點型等之光擴散印刷。 The light guide plate 35 is formed of a substantially flat plate shape formed by using at least one side surface as a light incident surface and a slightly perpendicular side surface as a light exit surface. The light guide plate 35 is mainly selected from polymethacrylic acid. It is a base resin of highly transparent resin such as methyl ester, polycarbonate, or amorphous olefin resin. If necessary, resin particles having a refractive index different from that of the matrix resin may be added. Even if each surface of the light guide plate is not the same plane but has a complicated surface shape, light-diffusion printing such as a dot pattern can be provided.

光源34係配置於導光板35之至少一末端部 分者，主要係使用冷陰極管、LED光源等。作為光源的形狀，可列舉點狀、線狀、L字狀者等。 The light source 34 is disposed on at least one end portion of the light guide plate 35 The main ones are cold cathode tubes and LED light sources. Examples of the shape of the light source include a dot shape, a line shape, and an L shape.

反射薄片36係配置於導光板35之下者。該反射薄片只要不降低亮度值，則並未特別限定。例如適合使用載持銀蒸鍍或鋁之有金屬光澤的反射薄片。 The reflection sheet 36 is disposed below the light guide plate 35. This reflective sheet is not particularly limited as long as it does not lower the brightness value. For example, it is suitable to use a metallic glossy reflection sheet that carries silver vapor deposition or aluminum.

棱鏡薄片31、32係配置於光擴散性薄片33之上者。該棱鏡薄片只要不降低亮度值，可使用以往周知者。 The prism sheets 31 and 32 are arranged on the light diffusing sheet 33. As long as the prism sheet does not lower the brightness value, a conventionally known one can be used.

背光裝置中，除了上述之棱鏡薄片、光擴散性薄片、導光板、反射薄片及光源之外，因應目的可具備偏光薄膜、電磁波屏蔽薄膜等。 In addition to the prism sheet, light diffusing sheet, light guide plate, reflective sheet, and light source described above, the backlight device may include a polarizing film, an electromagnetic wave shielding film, and the like depending on the purpose.

本實施形態之背光裝置30除了為具備導光板35、與配置於導光板35之至少一末端部分之光源34者，於導光板35之光出射面上由於依順序具有上述之本發明的光擴散性薄片33與棱鏡薄片31、32，即使縮小背光裝置之顯示畫面的邊框，與以往之背光裝置相比較，亮度幾乎並未降低，可減低光源34附近的亮度不均且可使導光板35末端部分的漏光不明顯。 The backlight device 30 of this embodiment is provided with the light guide plate 35 and the light source 34 disposed on at least one end portion of the light guide plate 35. The light emitting surface of the light guide plate 35 has the light diffusion of the present invention described above in order. Compared with the conventional backlight devices, the brightness of the flexible sheet 33 and the prism sheets 31 and 32 is reduced even when the frame of the display screen of the backlight device is reduced. The brightness unevenness near the light source 34 can be reduced and the end of the light guide plate 35 can be reduced Part of the light leakage is not obvious.

其次，於圖3表示作為使用本發明的光擴散性薄片之背光裝置的其他實施形態之直下型的背光裝置50。此背光裝置作為主要構成，收納於框體55內，複數配置光源54於反射薄膜56、反射薄膜56上，於其上，透過擴散板53，配置本發明的光擴散性薄片52，進而具有配置棱鏡薄片51的結構。尚，於圖3，雖表示光擴散 性薄片52與棱鏡薄片51一個接一個使用的情況，但亦可分別重疊複數枚使用。 Next, a direct type backlight device 50 as another embodiment of the backlight device using the light diffusing sheet of the present invention is shown in FIG. 3. This backlight device is mainly constituted, and is housed in a frame 55. A plurality of light sources 54 are disposed on the reflective film 56 and the reflective film 56. The light diffusing sheet 52 of the present invention is disposed through the diffusion plate 53 and further has an arrangement. Structure of the prism sheet 51. Still, in Figure 3, it shows the light diffusion In the case where the sex sheet 52 and the prism sheet 51 are used one by one, a plurality of them may be used by overlapping each other.

擴散板53係設置於直下型之背光裝置的光源上，具有減低光源的圖型之功能，主要係由合成樹脂所成者。如此之擴散板，單單為了具有光擴散性，厚度必須厚至1~10mm，支撐光擴散性薄片，係與本發明的光擴散性薄片不同者。 The diffuser plate 53 is provided on the light source of the direct type backlight device, and has a function of reducing the pattern of the light source, and is mainly made of synthetic resin. Such a diffusing plate must be 1 to 10 mm thick in order to have light diffusibility, and the light diffusing sheet is different from the light diffusing sheet of the present invention.

作為構成擴散板53之合成樹脂，可列舉聚酯系樹脂、丙烯酸系樹脂、丙烯醯基胺基甲酸乙酯系樹脂、聚酯丙烯酸酯系樹脂、聚胺基甲酸乙酯丙烯酸酯系樹脂、環氧丙烯酸酯系樹脂、胺基甲酸乙酯系樹脂、環氧系樹脂、聚碳酸脂系樹脂、纖維素系樹脂、縮醛系樹脂、聚乙烯系樹脂、聚苯乙烯系樹脂、聚醯胺系樹脂、聚醯亞胺系樹脂、三聚氰胺系樹脂、酚系樹脂、矽氧系樹脂等之熱塑性樹脂、熱硬化性樹脂、電離放射線硬化性樹脂等。此等當中，適合使用光學特性優異之丙烯酸系樹脂。 Examples of the synthetic resin constituting the diffuser plate 53 include a polyester resin, an acrylic resin, an acrylic urethane resin, a polyester acrylate resin, a polyurethane acrylate resin, and a ring. Oxyacrylate resin, urethane resin, epoxy resin, polycarbonate resin, cellulose resin, acetal resin, polyethylene resin, polystyrene resin, polyamide resin Thermoplastic resins such as resins, polyimide-based resins, melamine-based resins, phenol-based resins, and silicone-based resins, thermosetting resins, ionizing radiation-hardening resins, and the like. Among these, an acrylic resin excellent in optical characteristics is suitably used.

擴散板53中，為了賦予光擴散性，而添加微粒子。作為微粒子，可列舉除了二氧化矽、黏土、滑石、碳酸鈣、硫酸鈣、硫酸鋇、矽酸鋁、氧化鈦、合成沸石、氧化鋁、蒙脫石等之無機微粒子之外、由苯乙烯樹脂、胺基甲酸乙酯樹脂、苯胍胺樹脂、矽氧樹脂、丙烯酸樹脂等所成之有機微粒子。 In the diffusion plate 53, fine particles are added in order to impart light diffusibility. Examples of the fine particles include styrene resins other than inorganic fine particles such as silica, clay, talc, calcium carbonate, calcium sulfate, barium sulfate, aluminum silicate, titanium oxide, synthetic zeolite, alumina, and montmorillonite. , Urethane resin, benzoguanamine resin, silicone resin, acrylic resin and other organic particles.

光源54主要係使用冷陰極管、LED光源等。作為光源的形狀，可列舉點狀、線狀、L字狀者等。 The light source 54 mainly uses a cold cathode tube, an LED light source, and the like. Examples of the shape of the light source include a dot shape, a line shape, and an L shape.

反射薄膜56可配置於光源54之下。只要不降低亮度值，則並未特別限定。具體而言，適合使用白色薄膜。 The reflective film 56 may be disposed under the light source 54. It does not specifically limit as long as a brightness value is not reduced. Specifically, a white film is suitable.

棱鏡薄片51可配置於本發明的光擴散性薄片之上。只要不降低亮度值，可使用以往周知者。 The prism sheet 51 may be disposed on the light-diffusing sheet of the present invention. As long as the brightness value is not reduced, a conventionally known one can be used.

框體55係用在直下型背光裝置，可使用以往周知者。 The casing 55 is used for a direct type backlight device, and a conventionally known one can be used.

尚，背光裝置中不僅本發明的光擴散性薄片，亦可適當組合以往周知之光學構件使用。例如、背光裝置中，除了上述之棱鏡薄片、光擴散性薄片、擴散板、反射薄膜及光源之外，因應目的可具備反射板、偏光薄膜、電磁波屏蔽薄膜等。 In addition, not only the light-diffusing sheet of the present invention but also a conventionally well-known optical member can be used in a backlight device as appropriate. For example, in addition to the prism sheet, light diffusing sheet, diffusion plate, reflective film, and light source described above, the backlight device may include a reflective plate, a polarizing film, an electromagnetic wave shielding film, and the like according to the purpose.

本實施形態之背光裝置係收納於框體55內，複數配置光源54於反射薄膜56、反射薄膜上，於其上，透過擴散板53，配置本發明的光擴散性薄片52，進而由於具有配置棱鏡薄片51的結構，即使縮小背光裝置之顯示畫面的邊框，與以往之背光裝置相比較，亮度幾乎並未降低，可減低光源54附近的亮度不均且可使擴散板53末端部分的漏光不明顯。 The backlight device of this embodiment is housed in a frame 55, and a plurality of light sources 54 are disposed on the reflective film 56 and the reflective film, and the light diffusing sheet 52 of the present invention is disposed through the diffuser plate 53. The structure of the prism sheet 51, even if the frame of the display screen of the backlight device is reduced, compared with the conventional backlight device, the brightness is hardly reduced. It can reduce uneven brightness near the light source 54 and prevent light leakage at the end of the diffuser plate 53. obvious.

尚，本發明特徵為光擴散性薄片，本發明若為使用本發明的光擴散性薄片者，亦可適當使用上述之實施形態以外之背光裝置、或背光裝置以外之光源裝置。 The present invention is characterized by a light diffusing sheet, and if the present invention is a person using the light diffusing sheet of the present invention, a backlight device other than the above-mentioned embodiment or a light source device other than the backlight device may be appropriately used.

[實施例] [Example]

以下，由實施例進一步說明本發明。尚，「份」、「%」除非另有說明，係作為重量基準，稀釋溶劑以外的量全部作為固形量。 Hereinafter, the present invention will be further explained by examples. In addition, unless otherwise stated, "parts" and "%" are based on weight, and the amounts other than the dilution solvent are all solid amounts.

1.光擴散性薄片的製作 1. Production of light diffusing sheet <實施例1> <Example 1>

混合下述處方之光擴散層用塗佈液並攪拌後，於由厚度23μm之聚對苯二甲酸乙二酯薄膜(Lumirror T60：東麗公司)所成之支撐體上，以乾燥後的厚度成為5μm的方式由棒塗法進行塗佈、乾燥而形成光擴散層。其次，於和形成該支撐體之光擴散層的面相反的面，將下述處方之背塗層用塗佈液以乾燥後的厚度成為5μm的方式由棒塗法進行塗佈、乾燥而形成背塗層，而得到實施例1之光擴散性薄片。 The coating solution for the light diffusion layer of the following formula was mixed and stirred, and then dried on a support made of a polyethylene terephthalate film (Lumirror T60: Toray Co., Ltd.) having a thickness of 23 μm, and the thickness after drying. The light-diffusion layer was formed so that it might become 5 micrometers by apply | coating and drying by a bar coating method. Next, on the surface opposite to the surface on which the light diffusing layer of the support was formed, a coating liquid for back coating of the following formulation was applied and dried by a bar coating method so that the thickness after drying became 5 μm. Back coating to obtain the light diffusing sheet of Example 1.

<光擴散層塗膜用塗佈液> <Coating liquid for light diffusion layer coating film>

．丙烯酸多元醇樹脂 4份 ． Acrylic polyol resin 4 parts

(ACRYDIC A-817：DIC公司、固體含量50%、Tg96℃、折射率1.51) (ACRYDIC A-817: DIC Corporation, 50% solids content, Tg 96 ° C, refractive index 1.51)

．丙烯酸多元醇樹脂 6份 ． Acrylic polyol resin 6 parts

(ACRYDIC A-811：DIC公司、固體含量50%、Tg19℃、折射率1.49) (ACRYDIC A-811: DIC Corporation, 50% solids content, Tg 19 ° C, refractive index 1.49)

．聚異氰酸酯 2份 ． Polyisocyanate 2 parts

(TAKENATE D110N：三井化學公司、固體含量60%) (TAKENATE D110N: Mitsui Chemicals, 60% solids content)

．丙烯酸樹脂粒子 10份 ． 10 parts of acrylic resin particles

(聚甲基丙烯酸甲酯真球狀粒子、平均粒徑2~3μm、折射率1.49) (Polymethyl methacrylate true spherical particles, average particle diameter 2 ~ 3μm, refractive index 1.49)

．二氧化鋯 14.4份 ． Zirconium dioxide 14.4 parts

(氧化鋯PCS：日本電工公司、一次粒徑20nm、折射率2.40、比重6) (Zirconium oxide PCS: Nippon Electric Works, primary particle size 20nm, refractive index 2.40, specific gravity 6)

．稀釋溶劑 94份 ． Diluted solvent 94 parts

<實施例1之背塗層用塗佈液> <Coating liquid for back coating of Example 1>

．丙烯酸多元醇樹脂 10份 ． Acrylic polyol resin 10 parts

(ACRYDIC A-807：DIC公司、固體含量50%) (ACRYDIC A-807: DIC Corporation, 50% solids content)

．聚異氰酸酯 2份 ． Polyisocyanate 2 parts

(TAKENATE D110N：三井化學公司、固體含量60%) (TAKENATE D110N: Mitsui Chemicals, 60% solids content)

．尼龍樹脂粒子 0.1份 ． 0.1 parts of nylon resin particles

(尼龍樹脂真球狀粒子：平均粒徑5μm) (Nylon resin true spherical particles: average particle size: 5 μm)

．稀釋溶劑 38份 ． Diluted solvent 38 parts

<實施例2> <Example 2>

實施例1之光擴散層用塗佈液當中，除了將二氧化鋯的重量份變更為16.8份之外其他與實施例1同樣進行，而得到實施例2之光擴散性薄片。 The light-diffusing sheet of Example 2 was obtained in the same manner as in Example 1 except that the weight portion of zirconia was changed to 16.8 parts in the coating liquid for a light-diffusing layer of Example 1.

<實施例3> <Example 3>

實施例1之光擴散層用塗佈液當中，除了將二氧化鋯 的重量份變更為19.2份之外，其他與實施例1同樣進行，而得到實施例3之光擴散性薄片。 In the coating liquid for a light diffusion layer of Example 1, excluding zirconium dioxide The light-diffusing sheet of Example 3 was obtained in the same manner as in Example 1 except that the weight part was changed to 19.2 parts.

<實施例4> <Example 4>

實施例1之光擴散層用塗佈液當中，除了將二氧化鋯的重量份變更為21.6份之外，其他與實施例1同樣進行，而得到實施例4之光擴散性薄片。 The light-diffusing sheet of Example 4 was obtained in the same manner as in Example 1 except that the weight part of the zirconium dioxide was changed to 21.6 parts in the coating liquid for a light-diffusing layer of Example 1.

<實施例5> <Example 5>

實施例1之光擴散層用塗佈液當中，除了將二氧化鋯的重量份變更為24.0份之外，其他與實施例1同樣進行，而得到實施例5之光擴散性薄片。 The light-diffusing sheet of Example 5 was obtained in the same manner as in Example 1 except that the weight part of the zirconium dioxide was changed to 24.0 parts.

<實施例6> <Example 6>

除了將實施例1之光擴散層用塗佈液變更為下述處方之外，其他與實施例1同樣進行，而得到實施例6之光擴散性薄片。 A light-diffusing sheet of Example 6 was obtained in the same manner as in Example 1 except that the coating liquid for a light-diffusing layer in Example 1 was changed to the following formulation.

<實施例6之光擴散層塗膜用塗佈液> <The coating liquid for the light-diffusion layer coating film of Example 6>

．丙烯酸多元醇樹脂 10份 ． Acrylic polyol resin 10 parts

(ACRYDIC A-811：DIC公司、固體含量50%、Tg19℃、折射率1.49) (ACRYDIC A-811: DIC Corporation, 50% solids content, Tg 19 ° C, refractive index 1.49)

．聚異氰酸酯 2份 ． Polyisocyanate 2 parts

(TAKENATE D110N：三井化學公司、固體含量60%) (TAKENATE D110N: Mitsui Chemicals, 60% solids content)

．丙烯酸樹脂粒子 10份 ． 10 parts of acrylic resin particles

(聚甲基丙烯酸甲酯真球狀粒子、平均粒徑2~3μm、折射率1.49) (Polymethyl methacrylate true spherical particles, average particle diameter 2 ~ 3μm, refractive index 1.49)

．二氧化鋯 24.0份 ． 24.0 parts of zirconium dioxide

(氧化鋯PCS：日本電工公司、一次粒徑20nm、折射率2.40、比重6) (Zirconium oxide PCS: Nippon Electric Works, primary particle size 20nm, refractive index 2.40, specific gravity 6)

．稀釋溶劑 94份 ． Diluted solvent 94 parts

<實施例7> <Example 7>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯的重量份變更為26.4份之外，其他與實施例6同樣進行，而得到實施例7之光擴散性薄片。 The light-diffusing sheet of Example 7 was obtained in the same manner as in Example 6 except that the weight part of the zirconium dioxide was changed to 26.4 parts in the coating liquid for a light-diffusing layer in Example 6.

<實施例8> <Example 8>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯的重量份變更為28.8份之外，其他與實施例6同樣進行，而得到實施例8之光擴散性薄片。 The light-diffusing sheet of Example 8 was obtained in the same manner as in Example 6 except that the weight part of the zirconium dioxide was changed to 28.8 parts.

<實施例9> <Example 9>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯的重量份變更為33.6份之外，其他與實施例6同樣進行，而得到實施例9之光擴散性薄片。 The light-diffusing sheet of Example 9 was obtained in the same manner as in Example 6 except that the weight part of zirconia was changed to 33.6 parts.

<實施例10> <Example 10>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯的重量份變更為38.4份之外，其他與實施例6同樣進行，而得到實施例10之光擴散性薄片。 The light-diffusing sheet of Example 10 was obtained in the same manner as in Example 6 except that the weight part of the zirconium dioxide was changed to 38.4 parts.

<實施例11> <Example 11>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯變更為二氧化鈦(金紅石型TiO2)(TronoxR-KB-2、拜耳公司、一次粒徑20nm、折射率2.71、比重4.3)，將重量份變更為7.2份之外，其他與實施例6同樣進行，而得到實施例11之光擴散性薄片。 In the coating liquid for a light diffusion layer of Example 6, except that zirconia was changed to titanium dioxide (rutile TiO 2 ) (TronoxR-KB-2, Bayer, primary particle diameter 20 nm, refractive index 2.71, specific gravity 4.3) The light-diffusing sheet of Example 11 was obtained in the same manner as in Example 6 except that the weight part was changed to 7.2 parts.

<實施例12> <Example 12>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯變更為與實施例11所使用之二氧化鈦相同之二氧化鈦，將重量份變更為14.4份之外，其他與實施例6同樣進行，而得到實施例12之光擴散性薄片。 The coating liquid for a light diffusion layer of Example 6 was performed in the same manner as in Example 6 except that the zirconium dioxide was changed to the same titanium dioxide as that used in Example 11 and the weight part was changed to 14.4 parts. Thus, a light-diffusing sheet of Example 12 was obtained.

<實施例13> <Example 13>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯變更為氧化鋅(Nano Fine50A、境化學工業、一次粒徑20nm、折射率1.95、比重5.6)，將重量份變更為28.8份之外，其他與實施例6同樣進行，而得到實施例13之光擴散性薄片。 In the coating liquid for a light diffusion layer of Example 6, the zirconium dioxide was changed to zinc oxide (Nano Fine 50A, Sakai Chemical Industries, primary particle diameter 20 nm, refractive index 1.95, specific gravity 5.6), and the weight part was changed to 28.8 parts Other than that, it carried out similarly to Example 6, and obtained the light-diffusing sheet of Example 13.

<實施例14> <Example 14>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯變更為與實施例13所使用之氧化鋅相同之氧化鋅，將重量份變更為57.6份之外，其他與實施例6同樣進行，而得到實施例14之光擴散性薄片。 The coating liquid for a light diffusion layer of Example 6 was the same as Example 6 except that the zirconium dioxide was changed to the same zinc oxide as that used in Example 13 and the weight part was changed to 57.6 parts. This was carried out to obtain a light-diffusing sheet of Example 14.

<比較例1> <Comparative example 1>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯的重量份變更為12.0份之外，其他與實施例6同樣進行，而得到比較例1之光擴散性薄片。 The light-diffusing sheet of Comparative Example 1 was obtained in the same manner as in Example 6 except that the weight of the zirconium dioxide was changed to 12.0 parts in the coating liquid for a light-diffusing layer of Example 6.

<比較例2> <Comparative example 2>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯的重量份變更為9.6份之外，其他與實施例6同樣進行，而得到比較例2之光擴散性薄片。 The light-diffusing sheet of Comparative Example 2 was obtained in the same manner as in Example 6 except that the coating liquid for a light-diffusing layer of Example 6 was changed to 9.6 parts by weight.

<比較例3> <Comparative example 3>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯變更為與實施例13所使用之氧化鋅相同之氧化鋅，將重量份變更為14.4份之外，其他與實施例6同樣進行，而得到比較例3之光擴散性薄片。 The coating liquid for a light diffusion layer of Example 6 was the same as Example 6 except that the zirconium dioxide was changed to the same zinc oxide as that used in Example 13, and the weight part was changed to 14.4 parts. This was performed to obtain a light diffusing sheet of Comparative Example 3.

<比較例4> <Comparative Example 4>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯 變更為與實施例13所使用之氧化鋅相同之氧化鋅，將重量份變更為7.2份之外，其他與實施例6同樣進行，而得到比較例4之光擴散性薄片。 In the coating liquid for a light diffusion layer of Example 6, except for zirconia A light-diffusing sheet of Comparative Example 4 was obtained in the same manner as in Example 6 except that the same zinc oxide as that used in Example 13 was changed, and the weight part was changed to 7.2 parts.

<比較例5> <Comparative example 5>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯的重量份變更為48.0份之外，其他與實施例6同樣進行，而得到比較例5之光擴散性薄片。 The light-diffusing sheet of Comparative Example 5 was obtained in the same manner as in Example 6 except that the weight of the zirconium dioxide was changed to 48.0 parts in the coating liquid for a light-diffusing layer of Example 6.

<比較例6> <Comparative Example 6>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯變更為與實施例11所使用之二氧化鈦相同之二氧化鈦，將重量份變更為28.8份之外，其他與實施例6同樣進行，而得到比較例6之光擴散性薄片。 The coating liquid for a light diffusion layer of Example 6 was performed in the same manner as in Example 6 except that the zirconia was changed to the same titanium dioxide as that used in Example 11 and the weight part was changed to 28.8 parts. Thus, a light-diffusing sheet of Comparative Example 6 was obtained.

<比較例7> <Comparative Example 7>

實施例6之光擴散層用塗佈液當中，除了將二氧化鋯變更為與實施例13所使用之氧化鋅相同之氧化鋅，將重量份變更為72.0份之外，其他與實施例6同樣進行，而得到比較例7之光擴散性薄片。 The coating liquid for a light diffusion layer of Example 6 was the same as Example 6 except that the zirconium dioxide was changed to the same zinc oxide as that used in Example 13 and the weight part was changed to 72.0 parts. This was performed to obtain a light diffusing sheet of Comparative Example 7.

<實施例15> <Example 15>

除了將實施例1之光擴散層用塗佈液變更為下述處方之外，其他與實施例1同樣進行，作成光擴散性薄片。下 述處方當中，僅將丙烯酸樹脂粒子(小粒子)的含量M變成11.2份、14.4份、18份、21.6份，而得到4種之光擴散性薄片。 A light-diffusing sheet was prepared in the same manner as in Example 1 except that the coating liquid for a light-diffusing layer in Example 1 was changed to the following formulation. under In the prescription, only the content M of the acrylic resin particles (small particles) was changed to 11.2 parts, 14.4 parts, 18 parts, and 21.6 parts, and four kinds of light-diffusing sheets were obtained.

<實施例15之光擴散層塗膜用塗佈液> <Coating liquid for light diffusion layer coating film of Example 15>

．丙烯酸多元醇樹脂 10份 ． Acrylic polyol resin 10 parts

(ACRYDIC A-811：DIC公司、固體含量50%、Tg19℃、折射率1.49) (ACRYDIC A-811: DIC Corporation, 50% solids content, Tg 19 ° C, refractive index 1.49)

．聚異氰酸酯 2份 ． Polyisocyanate 2 parts

(TAKENATE D110N：三井化學公司、固體含量60%) (TAKENATE D110N: Mitsui Chemicals, 60% solids content)

．丙烯酸樹脂粒子(小粒子) M份 ． Acrylic resin particles (small particles) M parts

(聚甲基丙烯酸甲酯真球狀粒子、平均粒徑2~3μm、折射率1.49) (Polymethyl methacrylate true spherical particles, average particle diameter 2 ~ 3μm, refractive index 1.49)

．丙烯酸樹脂粒子(大粒子) 4.8份 ． Acrylic resin particles (large particles) 4.8 parts

(聚甲基丙烯酸甲酯真球狀粒子、平均粒徑5μm、折射率1.49) (Polymethyl methacrylate true spherical particles, average particle size 5 μm, refractive index 1.49)

．二氧化鈦(金紅石型TiO2) 6份 ． Titanium dioxide (rutile TiO 2 ) 6 parts

(Tronox R-KB-2、拜耳公司、一次粒徑20nm、折射率2.71、比重4.3) (Tronox R-KB-2, Bayer, primary particle size 20nm, refractive index 2.71, specific gravity 4.3)

稀釋溶劑 94份 Diluted solvent 94 parts

<實施例16> <Example 16>

除了將實施例15之光擴散層用塗佈液變更為下述處方之外其他與實施例15同樣進行，作成光擴散性薄片。 下述處方之2種無機微粒子當中，將二氧化鋯的含量L固定為7.2份，將二氧化鈦的含量N變為4.8份、5.4份、6份，而得到3種之光擴散性薄片。 A light-diffusing sheet was prepared in the same manner as in Example 15 except that the coating liquid for a light-diffusing layer in Example 15 was changed to the following formulation. Among the two kinds of inorganic fine particles of the following prescription, the content L of the zirconium dioxide was fixed to 7.2 parts, and the content N of the titanium dioxide was changed to 4.8 parts, 5.4 parts, and 6 parts to obtain three kinds of light-diffusing sheets.

<實施例16之光擴散層塗膜用塗佈液> <Coating liquid for light diffusion layer coating film of Example 16>

．丙烯酸多元醇樹脂 10份 ． Acrylic polyol resin 10 parts

(ACRYDICA-811：DIC公司、固體含量50%、Tg19℃、折射率1.49) (ACRYDICA-811: DIC Corporation, 50% solids content, Tg 19 ° C, refractive index 1.49)

．聚異氰酸酯 2份 ． Polyisocyanate 2 parts

(TAKENATED110N：三井化學公司、固體含量60%) (TAKENATED110N: Mitsui Chemicals, 60% solids content)

．丙烯酸樹脂粒子(小粒子) 9.6份 ． Acrylic resin particles (small particles) 9.6 parts

(聚甲基丙烯酸甲酯真球狀粒子、平均粒徑2~3μm、折射率1.49) (Polymethyl methacrylate true spherical particles, average particle diameter 2 ~ 3μm, refractive index 1.49)

．丙烯酸樹脂粒子(大粒子) 4.8份 ． Acrylic resin particles (large particles) 4.8 parts

(聚甲基丙烯酸甲酯真球狀粒子、平均粒徑5μm、折射率1.49) (Polymethyl methacrylate true spherical particles, average particle size 5 μm, refractive index 1.49)

．二氧化鋯 L份 ． ZrO2

(氧化鋯PCS：日本電工公司、一次粒徑20nm、折射率2.40、比重6) (Zirconium oxide PCS: Nippon Electric Works, primary particle size 20nm, refractive index 2.40, specific gravity 6)

．二氧化鈦(金紅石型TiO2) N份 ． Titanium dioxide (rutile TiO 2 ) N parts

(TronoxR-KB-2、拜耳公司、一次粒徑20nm、折射率2.71、比重4.3) (TronoxR-KB-2, Bayer, primary particle size 20nm, refractive index 2.71, specific gravity 4.3)

稀釋溶劑 94份 Diluted solvent 94 parts

<實施例17-19> <Examples 17-19>

以與實施例16相同的處方，作成使2種無機微粒子(二氧化鋯與二氧化鈦)的比例變化之複數的光擴散薄片。於實施例17，將在實施例16處方之二氧化鈦的含量N固定為2.4份，將二氧化鋯的含量L變為9.6份、12份、14.4份、16.8份。又於實施例18，將在實施例16處方之二氧化鈦的含量N固定為3.6份，將二氧化鋯的含量L變為9.6份、12份、14.4份。於實施例19，將在實施例16處方之二氧化鈦的含量N固定為4.8份，將二氧化鋯的含量L變為8.4份、9.6份、12份、14.4份、16.8份。 Using the same prescription as in Example 16, a plurality of light-diffusing sheets were prepared in which the ratio of two kinds of inorganic fine particles (zirconia and titanium dioxide) was changed. In Example 17, the content N of the titanium dioxide prescribed in Example 16 was fixed to 2.4 parts, and the content L of the zirconium dioxide was changed to 9.6 parts, 12 parts, 14.4 parts, and 16.8 parts. Also in Example 18, the content N of titanium dioxide prescribed in Example 16 was fixed to 3.6 parts, and the content L of zirconia was changed to 9.6 parts, 12 parts, and 14.4 parts. In Example 19, the content N of titanium dioxide prescribed in Example 16 was fixed to 4.8 parts, and the content L of zirconia was changed to 8.4 parts, 9.6 parts, 12 parts, 14.4 parts, and 16.8 parts.

<實施例20、21> <Examples 20 and 21>

實施例16之光擴散層用塗佈液當中，分別將二氧化鋯的含量L及二氧化鈦的含量N固定為9.6份、4.8份(作為無機微粒子之含量為14.4份)，使丙烯酸樹脂粒子之小粒子與大粒子的比例變化，作成複數之光擴散性薄片。於實施例20，將大粒子之含量與實施例16相同固定為4.8份，將小粒子之含量變更為4.8份、7.2份。於實施例21將小粒子之含量與實施例16相同固定為9.6份，將大粒子之含量變更為2.4份、3.6份。 In the coating liquid for a light diffusion layer of Example 16, the content L of zirconia and the content N of titanium dioxide were fixed to 9.6 parts and 4.8 parts (the content of inorganic fine particles was 14.4 parts), so that the acrylic resin particles were small. The ratio of particles to large particles is changed to form a plurality of light-diffusing sheets. In Example 20, the content of large particles was fixed to 4.8 parts as in Example 16, and the content of small particles was changed to 4.8 parts and 7.2 parts. In Example 21, the content of small particles was fixed to 9.6 parts as in Example 16, and the content of large particles was changed to 2.4 parts and 3.6 parts.

2.背光裝置的製作 2. Manufacturing of backlight

將實施例1~21、比較例1~7之光擴散性薄片在4 英寸之邊光型背光(內藏光度1300mcd之LED光源8燈、厚度0.5mm之聚碳酸脂製導光板)，該光擴散性薄片的背塗層以與該導光板對向的方式內置，進而於該光擴散性薄片之光擴散層上，重疊配置厚度65μm之第一棱鏡薄片(TBEF2-GT：住友3M公司)與厚度68μm之第二棱鏡薄片(TBEF2-GM：住友3M公司)，製作實施例1~21、比較例1~7之各種背光裝置。尚，2枚棱鏡薄片係將結構列作為上側(出射側)，結構列個別的稜線以垂直的方式配置。 The light diffusing sheets of Examples 1 to 21 and Comparative Examples 1 to 7 were placed in 4 Inch edge light type backlight (built-in 1300mcd LED light source 8 lights, 0.5mm thick polycarbonate light guide plate), the back coating of the light diffusing sheet is built to face the light guide plate, and further On the light diffusing layer of this light diffusing sheet, a first prism sheet (TBEF2-GT: Sumitomo 3M) and a second prism sheet (TBEF2-GM: Sumitomo 3M) having a thickness of 65 μm were superimposed, and implemented. Various backlight devices of Examples 1 to 21 and Comparative Examples 1 to 7. The two prism sheets have the structure row as the upper side (the exit side), and the individual ridge lines of the structure row are arranged vertically.

3.Y值的測定 3. Determination of Y value

由CIE-XYZ表色系，以「Y值」評價「高光擴散性」。由色度計(日本電色工業公司、ZE-2000)，將光擴散性薄片之光擴散層作為入光面，藉由JIS Z 8722：2000之D65光源的透過測定方法測定Y值。 From the CIE-XYZ color system, "high light diffusivity" was evaluated with "Y value". The Y value was measured by a colorimeter (Nippon Denshoku Kogyo Co., Ltd., ZE-2000) using the light-diffusing layer of the light-diffusing sheet as the light-incident surface by the transmission measurement method of D65 light source of JIS Z 8722: 2000.

4.藉由目視之亮度均一化評價 4. Evaluation of uniformity of brightness by visual inspection

於上述「背光裝置的製作」所製作之背光裝置，取出2枚棱鏡薄片(僅光擴散性薄片)進行點燈，將實施例1~14、比較例1~7之光擴散性薄片之光源附近的亮度不均及導光板末端部分的漏光藉由目視評價。評價係從背光裝置之光出射面幾乎垂直30cm的距離，看不見LED光源(點光源)的圖型，且無光出射面末端部分的漏光，總之，將顯示面整體均勻看到者記為「○」、看到LED光 源圖型、或看到末端部分的漏光，總之將顯示面整體無法均勻看到者記為「×」。 In the backlight device produced by the above-mentioned "production of the backlight device", take out two prism sheets (light-diffusing sheet only) and light them, and place the light-diffusing sheets of Examples 1 to 14 and Comparative Examples 1 to 7 near the light source The uneven brightness and light leakage at the end of the light guide plate were visually evaluated. The evaluation is that the distance from the light exit surface of the backlight device is almost 30 cm, the pattern of the LED light source (point light source) is not visible, and the light leakage at the end portion of the non-light exit surface is short. ○ ", see LED light The source pattern or the light leakage at the end is seen as "×" if the entire display surface cannot be seen uniformly.

5.亮度比的測定 5. Measurement of brightness ratio

點燈於上述「背光裝置的製作」所製作之背光裝置(包含2枚棱鏡薄片)，使用色彩亮度計CS-200(柯尼卡美能達公司製)，測定正面方向的亮度，除以未包含無機微粒子之光擴散性薄片的正面亮度測定值(12,000cd/m2)，算出各光擴散性薄片的亮度比。亮度的測定係於暗室下進行。 Turn on the backlight device (including 2 prism sheets) produced by the above-mentioned "Creating a Backlight Device", and use a color brightness meter CS-200 (manufactured by Konica Minolta) to measure the brightness in the front direction. The measured value of the front brightness (12,000 cd / m 2 ) of the light-diffusing sheet of the inorganic fine particles was used to calculate the brightness ratio of each light-diffusing sheet. The measurement of brightness was performed in a dark room.

<測定條件> <Measurement conditions>

．測定距離：30cm ． Measuring distance: 30cm

．測定角(受光角)：1度 ． Measurement angle (light receiving angle): 1 degree

．測定點：中央1點 ． Measurement point: 1 point in the center

6.全光線透過率(Tt)及霧值(Haze)的測定方法 6.Measurement method of total light transmittance (Tt) and haze value (Haze)

依JIS K 7105測定方法，由霧值計(Suga試驗機公司、型式HGM-2K)、Color computer(Suga試驗機公司、型式SM-4)，將光擴散性薄片之光擴散層作為入光面，測定全光線透過率(Tt)及霧值(Haze)。 According to the JIS K 7105 measurement method, the light diffusing layer of the light diffusing sheet was used as the light incident surface by a haze meter (Suga Test Machine Co., Model HGM-2K) and Color computer (Suga Test Machine Co., Model SM-4). , Measure the total light transmittance (Tt) and the haze value (Haze).

7.評價 7. Evaluation

對於實施例1~14及比較例1~7，將測定結果示於表1。又對於實施例15~21，將對於個別代表性一例的結 果示於表2。表1及表2中，量(phr)係相對於黏結劑樹脂(固體含量)100重量份，無機微粒子之重量份。尚，黏結劑樹脂(固體含量)100重量份中，係包含作為硬化劑之聚異氰酸酯的量。 The measurement results are shown in Table 1 for Examples 1 to 14 and Comparative Examples 1 to 7. For Examples 15 to 21, the results of individual representative examples will be summarized. The results are shown in Table 2. In Tables 1 and 2, the amount (phr) refers to 100 parts by weight of the binder resin (solid content) and parts by weight of the inorganic fine particles. In 100 parts by weight of the binder resin (solid content), the amount of polyisocyanate is included as a curing agent.

從藉由表1及表2之目視之亮度均一化評價的結果即可明白，Y值為0.3~2.1的範圍之實施例1至21，減低光源附近的亮度不均，亦減少導光板末端部分的漏光。從實施例1至21，由於亮度比幾乎未變化，不會引起亮度過度降低，低減光源附近的亮度不均，減少導光板末端部分的漏光。尚，此等之實施例，即使與全光線透過率(Tt)高者相比較，亮度比亦不遜色。 As can be understood from the results of the visualized brightness uniformity evaluation in Tables 1 and 2, Examples 1 to 21 having a Y value in the range of 0.3 to 2.1 reduce uneven brightness near the light source and also reduce the end portion of the light guide plate. Light leakage. From Examples 1 to 21, since the brightness ratio is hardly changed, it does not cause excessive reduction in brightness, reduces uneven brightness near the light source, and reduces light leakage at the end portion of the light guide plate. Still, in these embodiments, the brightness ratio is not inferior even when compared with the one having a high total light transmittance (Tt).

比較實施例5與實施例6(黏結劑樹脂中不包含高玻璃轉移溫度的樹脂)時，實施例5雖看到若干之光擴散層側的凹捲曲，但實際使用上完全沒有問題。另外，實施例6表1之評價、或諸多物性雖與實施例5相同，但未發生捲曲。 When Example 5 was compared with Example 6 (the resin with a high glass transition temperature was not included in the binder resin), although Example 5 saw a number of concave curls on the light diffusion layer side, there was no problem in practical use. In addition, the evaluations and many physical properties of Table 1 in Example 6 were the same as those in Example 5, but no curling occurred.

尚，從實施例1至實施例21之光擴散性薄片由目視為白色。因此，作為代表關於實施例8及實施例12，將藉由CIE-XYZ表色系之「Yxy」的x值(小x 值)、y值(小y值)同樣以「3.Y值的測定」部分所說明之色度計進行測定。其結果，實施例8之x值為0.3344，y值為0.3430，實施例12之x值為0.3308，y值為0.3433。從上述x值與y值的測定結果，瞭解到在CIE-XYZ表色系，包含實施例8、實施例12之本發明的光擴散性薄片係呈現白色。尚，比較包含二氧化鋯之光擴散性薄片實施例1~10、與包含二氧化鈦之實施例12之光擴散性薄片時，較實施例12之薄片，實施例1~10之薄片者，白色度更高。 The light diffusing sheet from Example 1 to Example 21 was regarded as white. Therefore, as a representative of Example 8 and Example 12, the x value of the "Yxy" (small x Value) and y value (small y value) were also measured with a colorimeter as described in the "Measurement of 3. Y value" section. As a result, the x value in Example 8 was 0.3344, the y value was 0.3430, and the x value in Example 12 was 0.3308 and the y value was 0.3433. From the measurement results of the above-mentioned x value and y value, it is understood that in the CIE-XYZ color system, the light diffusing sheet system of the present invention including Examples 8 and 12 is white. In addition, when comparing the light-diffusing sheet Examples 1 to 10 containing zirconium dioxide and the light-diffusing sheet of Example 12 containing titanium dioxide, compared with the sheet of Example 12 and the sheet of Examples 1-10, the whiteness higher.

從比較例1至比較例4，由於Y值為0.3~2.1的範圍外，未改善光源附近的亮度不均、或導光板末端部分的光漏。從比較例5至比較例7，雖改善光源附近的亮度不均、或導光板末端部分的光漏，但由於Y值為0.3~2.1的範圍外，產生亮度下降。比較例5發生光擴散層側的捲曲，不適合實際使用。比較例6雖未發生捲曲，但光擴散層著色成黃色，不適合實際使用。比較例7發生捲曲，塗膜接著性亦不佳。尚，比較例5及比較例7中，推定發生捲曲的理由係因為無機微粒子之含量多，瞭解到防止捲曲發生，較佳為作為無機微粒子，使用以比較少含量得到所期望效果之無機微粒子(例如氧化鈦)。 From Comparative Example 1 to Comparative Example 4, the Y value outside the range of 0.3 to 2.1 did not improve uneven brightness near the light source or light leakage at the end portion of the light guide plate. From Comparative Example 5 to Comparative Example 7, although brightness unevenness in the vicinity of the light source or light leakage at the end portion of the light guide plate was improved, the brightness dropped due to the Y value outside the range of 0.3 to 2.1. In Comparative Example 5, curling occurred on the light diffusion layer side, which was not suitable for practical use. In Comparative Example 6, although the curl did not occur, the light diffusion layer was colored yellow, which was not suitable for practical use. In Comparative Example 7, curling occurred, and the adhesion of the coating film was also poor. In Comparative Example 5 and Comparative Example 7, the reason for the occurrence of curl is estimated to be because the content of the inorganic fine particles is large, and it is understood that the occurrence of curl is prevented, and it is preferable to use the inorganic fine particles having a relatively small content to obtain the desired effect as the inorganic fine particles ( (E.g. titanium oxide).

實施例15使用二氧化鈦作為無機微粒子，作為光擴散性樹脂粒子，使用平均粒徑不同之2種樹脂粒子(稱為小粒子、大粒子)之實施例。與使用相同二氧化鈦之實施例11比較時，丙烯酸樹脂粒子之合計量無論於實 施例15是否較實施例11更多，但由於二氧化鈦的含量少(實施例11相對於黏結劑樹脂100份為60份，實施例15相對於黏結劑樹脂100份為50份)，全光線透過率較實施例11更加提昇，4種之平均約為65%以上。又如圖4之圖表所示，對於Y值幾乎為1.0±0.1的範圍，可實現充分之亮度均一化。進而，可確認即使於添加用以防止傷發生之大粒子時，Y值保持在所期望的範圍。又，確認伴隨主要貢獻於光擴散性之小粒子含量的增加，雖發現Y值有降低的傾向，但若為適合之小粒子含量範圍，則可保持在適當之Y值。尚，圖4之圖表中，橫軸為小粒子之光擴散性樹脂粒子之含量(相對於黏結劑樹脂100份之份)。 Example 15 is an example in which titanium dioxide is used as the inorganic fine particles, and as the light diffusing resin particles, two types of resin particles (referred to as small particles and large particles) having different average particle diameters are used. When compared with Example 11 using the same titanium dioxide, the total amount of acrylic resin particles is not practical. Whether Example 15 is more than Example 11, but because the content of titanium dioxide is small (Example 11 is 60 parts with respect to 100 parts of the binder resin, and Example 15 is 50 parts with respect to 100 parts of the binder resin), and full light transmission The rate is more improved than in Example 11, and the average of the four types is about 65% or more. As shown in the graph of FIG. 4, for a range where the Y value is almost 1.0 ± 0.1, sufficient brightness uniformity can be achieved. Furthermore, it was confirmed that the Y value remained in a desired range even when large particles were added to prevent the occurrence of injuries. In addition, it was confirmed that the Y value tends to decrease with the increase in the content of small particles mainly contributing to light diffusivity, but it can be maintained at an appropriate Y value if it is in a suitable small particle content range. In the graph of FIG. 4, the horizontal axis is the content of the light-diffusing resin particles of small particles (parts with respect to 100 parts of the binder resin).

實施例16係以無機微粒子當中，二氧化鋯的量少(7.2份：相對於黏結劑100份為60份)的條件併用二氧化鈦之實施例。於實施例16，隨著二氧化鈦的含量增加，Y值雖從0.98低至0.86，但皆維持在高亮度比，且可保持65%以上之全光線透過率。即，確認列舉不會降低亮度比之隱蔽性之本發明的效果。 Example 16 is an example in which titanium dioxide is used in combination with a small amount of zirconia (7.2 parts: 60 parts relative to 100 parts of the binder) among the inorganic fine particles. In Example 16, with the increase of the content of titanium dioxide, although the Y values were lowered from 0.98 to 0.86, they all maintained at a high brightness ratio, and could maintain a full light transmittance of more than 65%. That is, the effect of the present invention that does not reduce the concealability of the brightness ratio was confirmed.

又，與僅使用二氧化鋯之實施例1相比較，無論無機微粒子之含量少，Y值降低。從此結果，瞭解到藉由併用二氧化鋯與二氧化鈦，未增加含量可實現高亮度均一化。 In addition, compared with Example 1 using only zirconium dioxide, the Y value was reduced regardless of the small content of the inorganic fine particles. From this result, it was found that by using zirconium dioxide and titanium dioxide in combination, high brightness uniformity can be achieved without increasing the content.

實施例17~實施例19，係將實施例16的卓見為本，研究變化二氧化鈦及二氧化鋯的比率不同時之Y值的變化之實施例。將變化此等2種無機微粒子之比例時 之Y值的變化示於圖5。圖5中，橫軸為2種無機微粒子之合計的含量(相對於黏結劑樹脂100份之份)。又圖5中作為參考，表示實施例1~4之光擴散性薄片(二氧化鋯的含量不同之4種實施例)之Y值的變化。 Examples 17 to 19 are examples based on the insights of Example 16 and study changes in the Y value when the ratio of titanium dioxide and zirconium dioxide is different. When changing the ratio of these two kinds of inorganic fine particles The change in Y value is shown in FIG. 5. In FIG. 5, the horizontal axis represents the total content of two kinds of inorganic fine particles (parts relative to 100 parts of the binder resin). In Fig. 5 as a reference, changes in the Y value of the light-diffusing sheets (the four examples in which the zirconia content differs) of Examples 1 to 4 are shown.

從圖5所示之結果即可明白，瞭解到相較於使用1種無機微粒子時，使用2種無機微粒子時，可緩和藉由含量之Y值的變化，易於調整Y值。又，為了得到適合之Y值，藉由組合必須有比較多的含量之無機粒子(例如二氧化鋯)與比較少含量的無機粒子(例如二氧化鈦)，Y值以外，影響無機粒子之含量之塗膜的性質，例如可易調整塗膜之接著性或捲曲的發生等。 As can be understood from the results shown in FIG. 5, it is understood that when two kinds of inorganic fine particles are used, compared with the case where one kind of inorganic fine particles is used, the change in the Y value of the content can be eased and the Y value can be easily adjusted. In addition, in order to obtain a suitable Y value, a relatively large amount of inorganic particles (such as zirconia) must be combined with a relatively small amount of inorganic particles (such as titanium dioxide). In addition to the Y value, the content of the inorganic particles is affected. The properties of the film, for example, can easily adjust the adhesion of the coating film or the occurrence of curl.

實施例20及實施例21係將2種無機微粒子之含量固定為14.4份(相對於黏結劑樹脂100份為120份)，變化2種之光擴散性樹脂粒子之比例及合計的含量者。從實施例20、21的結果，確認即減少光擴散性粒子(尤其是小粒子之含量)，無機微粒子若為適當之範圍，Y值最大也有1.16程度，實現亮度的均一化。 In Example 20 and Example 21, the content of the two kinds of inorganic fine particles was fixed at 14.4 parts (120 parts relative to 100 parts of the binder resin), and the proportion and total content of the two kinds of light-diffusing resin particles were changed. From the results of Examples 20 and 21, it was confirmed that the light diffusing particles (especially the content of small particles) were reduced, and if the inorganic fine particles were in an appropriate range, the Y value would be at most about 1.16 to achieve uniform brightness.

Claims (15)

一種光擴散性薄片，其係具有光擴散層之光擴散性薄片，其特徵為前述光擴散層包含黏結劑樹脂、與相對於前述黏結劑樹脂(固體含量)100重量份為60~220重量份之光擴散性樹脂粒子、與相對於前述黏結劑樹脂(固體含量)100重量份為40~480重量份之無機微粒子，前述光擴散性薄片藉由JIS Z 8722：2000之D65光源的透過測定方法之Y值為0.3以上且2.1以下，前述無機微粒子的折射率為1.9以上，藉由JIS Z 8722：2000之D65光源的透過測定方法之Y值為0.3以上且2.1以下，全光線透過率為45%~88%。A light diffusing sheet, which is a light diffusing sheet having a light diffusing layer, characterized in that the light diffusing layer includes a binder resin and 60 to 220 parts by weight relative to 100 parts by weight of the binder resin (solid content). The light-diffusing resin particles and the inorganic fine particles of 40 to 480 parts by weight based on 100 parts by weight of the binder resin (solid content), and the light-diffusing sheet is measured by a D65 light source according to JIS Z 8722: 2000. The Y value is 0.3 or more and 2.1 or less. The refractive index of the inorganic fine particles is 1.9 or more. According to the JIS Z 8722: 2000 D65 light source transmission measurement method, the Y value is 0.3 or more and 2.1 or less, and the total light transmittance is 45. % ~ 88%. 如請求項1之光擴散性薄片，其中，前述無機微粒子為較前述黏結劑樹脂折射率更高之高折射率金屬氧化物。The light-diffusing sheet according to claim 1, wherein the inorganic fine particles are high-refractive index metal oxides having a higher refractive index than the binder resin. 如請求項2之光擴散性薄片，其中，前述高折射率金屬氧化物為選自氧化鋯、氧化鈦、及氧化鋅中之一種以上。The light-diffusing sheet according to claim 2, wherein the high-refractive-index metal oxide is one or more selected from the group consisting of zirconia, titanium oxide, and zinc oxide. 如請求項1之光擴散性薄片，其中，前述無機微粒子為氧化鋯，相對於前述黏結劑樹脂(固體含量)100重量份，包含120~320重量份。The light-diffusing sheet according to claim 1, wherein the inorganic fine particles are zirconia and contain 120 to 320 parts by weight based on 100 parts by weight of the binder resin (solid content). 如請求項3之光擴散性薄片，其中，作為前述高折射率金屬氧化物，係使用氧化鋯及氧化鈦。The light-diffusing sheet according to claim 3, wherein the high refractive index metal oxide is zirconia or titanium oxide. 如請求項5之光擴散性薄片，其中，相對於前述黏結劑樹脂(固體含量)100重量份，前述氧化鋯與氧化鈦的合計含量為80~200重量份。The light-diffusing sheet according to claim 5, wherein the total content of the zirconia and titanium oxide is 80 to 200 parts by weight based on 100 parts by weight of the binder resin (solid content). 如請求項1或5之光擴散性薄片，其中，前述光擴散性樹脂粒子包含平均粒徑不同之2種樹脂粒子。The light-diffusing sheet according to claim 1 or 5, wherein the light-diffusing resin particles include two types of resin particles having different average particle diameters. 如請求項7之光擴散性薄片，其中，前述光擴散性樹脂粒子係平均粒徑大者之樹脂粒子的比例與平均粒徑小者之樹脂粒子的比例為相同或其以下。The light-diffusing sheet according to claim 7, wherein the ratio of the resin particles having a larger average particle diameter and the resin particles having a smaller average particle diameter of the light-diffusing resin particles is the same or less. 如請求項8之光擴散性薄片，其中，平均粒徑小者之樹脂粒子的平均粒徑為1μm以上且4μm以下。The light-diffusing sheet according to claim 8, wherein the resin particles having a smaller average particle diameter have an average particle diameter of 1 μm or more and 4 μm or less. 如請求項1或2之光擴散性薄片，其中，前述黏結劑樹脂包含玻璃轉移溫度為30℃以下之丙烯酸多元醇樹脂。The light-diffusing sheet according to claim 1 or 2, wherein the binder resin includes an acrylic polyol resin having a glass transition temperature of 30 ° C or lower. 如請求項10之光擴散性薄片，其中，前述黏結劑樹脂係進一步包含玻璃轉移溫度為40℃以上之丙烯酸多元醇樹脂。The light-diffusing sheet according to claim 10, wherein the binder resin further includes an acrylic polyol resin having a glass transition temperature of 40 ° C or higher. 如請求項11之光擴散性薄片，其中，前述玻璃轉移溫度為30℃以下之丙烯酸多元醇樹脂(固體含量)與前述玻璃轉移溫度為40℃以上之丙烯酸多元醇樹脂(固體含量)的合計為100重量份時，前述玻璃轉移溫度為30℃以下之丙烯酸多元醇樹脂為50重量份以上。The light-diffusing sheet according to claim 11, wherein the total of the acrylic polyol resin (solid content) with the glass transition temperature of 30 ° C or lower and the acrylic polyol resin (solid content) with the glass transition temperature of 40 ° C or higher is At 100 parts by weight, the acrylic polyol resin having a glass transition temperature of 30 ° C. or lower is 50 parts by weight or more. 如請求項1或2之光擴散性薄片，其中，全光線透過率為45%~88%。For example, the light-diffusing sheet of claim 1 or 2, wherein the total light transmittance is 45% to 88%. 一種背光裝置，其係具備反射薄片、與設置於前述反射薄片的上方之導光板、與配置於前述導光板的側面之光源、與配置於前述導光板之光出射面之側的光擴散性薄片、與配置於前述光擴散性薄片之光出射面之側的棱鏡薄片之背光裝置，其特徵為使用如請求項1~13中任一項之光擴散性薄片作為前述光擴散性薄片。A backlight device includes a reflective sheet, a light guide plate provided above the reflective sheet, a light source disposed on a side of the light guide plate, and a light diffusing sheet disposed on a side of a light exit surface of the light guide plate. A backlight device with a prism sheet disposed on the light emitting surface side of the light diffusing sheet, wherein the light diffusing sheet according to any one of claims 1 to 13 is used as the light diffusing sheet. 一種背光裝置，其係具備光源、與配置於前述光源之一側的擴散板、與配置於前述光源之另一側的反射薄膜、與配置於前述擴散板的上方之光擴散性薄片、與配置於前述光擴散性薄片之光出射面之側的棱鏡薄片之背光裝置，其特徵為使用如請求項1~13中任一項之光擴散性薄片作為前述光擴散性薄片。A backlight device includes a light source, a diffusion plate disposed on one side of the light source, a reflective film disposed on the other side of the light source, a light diffusing sheet disposed above the diffusion plate, and an arrangement The backlight device of the prism sheet on the light emitting surface side of the light diffusing sheet is characterized in that the light diffusing sheet according to any one of claims 1 to 13 is used as the light diffusing sheet.
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