200530705 (1) 九、發明說明 【發明所屬之技術領域】 本發明是有關於一種液晶顯示裝置用背光單元，特別 是有關於一種在光源使用面發光扁燈的液晶顯示裝置用背 光單元。 【先前技術】 近年來，作爲電視機或電腦的薄型顯示裝置，使用者 具備背光機構的液晶顯不裝置。 然而，習知作爲此種液晶顯示裝置所使用的背光機構 ’如第7圖至第8圖所示地，在具透光性的導光板1 〇 i的 端部’通用著倂設如螢光管的線狀光源；[04的邊緣光方式 (參照專利文獻1 )。 該邊緣光方式的情形，一般是在導光板i 〗的背面側 局部地被覆折射率比導光板1 0 1的材料還大的光擴散物質 1〇6。並以光反射層1〇3覆蓋大約其全面，而在導光板 1 〇 1的表面側配置光擴散性板或片以形成光擴散層！ 〇2。 然而，隨著液晶顯示裝置的大型化，在邊緣光方式中 ’除了產生照度不足或不均勻之外，還具有在周邊配設如 螢光管的線狀光源之故，因而有無法將裝置作成小型化的 缺點問題。 又，爲了對應於此，也提案一種在光擴散構件的背面 側配設如螢光管的線狀光源的正下方方式的背光（參照專 利文獻2 )’惟特別是在大型液晶顯示裝置的情形，爲了 -4- 200530705 (2) 作成不會產生照度不足或不均勻，配設多數線狀光源’同 時對應於線狀光源必須配設設透鏡薄膜等，這些會增大零 件數或使構造變複雜且在製造上費事，而有提昇製造成本 的缺點問題。 專利文獻1:日本特開平6— 95107號公報 專利文獻2:日本特開平n— 29583號公報 【發明內容】 本發明是鑑於上述習知的背光機構所具有的缺點問題 ’其目的是在於提供一種藉由在光源使用面發光扁燈，即 使大型液晶顯示裝置的情形，也不會產生不足或不均勻， 同時防止光擴散構件的本身重量或因從面發光扁燈所發生 熱的光擴散構件的變形，可進行高品位的照明，且零件數 少’構造簡單而製造上不需要費事，製造成本低的液晶顯 示裝置用背光單元。 爲了達成上述目的，本發明的液晶顯示裝置用背光單 元’屬於在光源使用面發光扁燈的液晶顯示裝置用背光單 兀’其特徵爲：在扁燈與光擴散構件之間形成空氣層，同 時藉由支持構件從背面側來支持上述光擴散構件。 在這時候’可將支持構件配設於面發光扁燈的表面。 又，可使用透明或透明的合成樹脂材料形成支持構件 〇 又’可使用支持構件的頂點面狀地支持，或線狀或點 狀地支持光擴散構件。 200530705 (3) 又，可將保持面發光扁燈與光擴散構件之間隔的外周 框的內周面形成於從背面側朝表面側擴開的傾斜面。 依照本發明的液晶顯示裝置用背光單元，在光源使用 面發光扁燈之故，因而即使在大型的液晶顯示裝置的情形 ，也可作成不會產生照度不足或不均勻。 又，在面發光扁燈與光擴散構件之間形成空氣層，同 時藉由支持構件從背面側支持光擴散構件之故，因而可防 止由光擴散構件的本身重量或扁燈所發生的熱量的光擴散 φ 構件所引起的變形（彎曲）與在光源使用扁燈相輔相成。 可進行高品位的照明，且零件數少，構造簡單而製造上不 需要費事，可將製造成本作成較低。 又，藉由將支持構件配設於面發光扁燈的表面，不會 拘束於扁燈的形狀等，成爲可將支持構件配設於任意位置 ，而藉由支持構件可更確實地支持光擴散構件。200530705 (1) IX. Description of the invention [Technical field to which the invention belongs] The present invention relates to a backlight unit for a liquid crystal display device, and more particularly, to a backlight unit for a liquid crystal display device that uses a surface-emitting flat lamp as a light source. [Prior Art] In recent years, as a thin display device of a television or a computer, a user has a liquid crystal display device having a backlight mechanism. However, as a backlight mechanism used in such a liquid crystal display device, as shown in FIG. 7 to FIG. 8, a light-transmitting light guide plate 10i is commonly used as a backlight. Linear light source of tube; [04] edge light system (see Patent Document 1). In the case of the edge light method, a light diffusing substance 106 having a refractive index larger than that of the material of the light guide plate 101 is partially partially coated on the back side of the light guide plate i0. A light reflecting layer 103 is used to cover the entire area, and a light diffusing plate or sheet is arranged on the surface side of the light guide plate 101 to form a light diffusing layer! 〇2. However, with the increase in the size of liquid crystal display devices, in the edge-light method, in addition to insufficient or uneven illumination, there are also linear light sources such as fluorescent tubes installed in the periphery, which makes it impossible to make the device. The downside of miniaturization. In order to cope with this, a backlight with a linear light source such as a fluorescent tube disposed on the back side of the light diffusing member has also been proposed (see Patent Document 2), but particularly in the case of a large-scale liquid crystal display device. In order to make sure that -4- 200530705 (2) does not produce insufficient or uneven illumination, most linear light sources are provided. At the same time, lens films must be provided in correspondence with linear light sources. These will increase the number of parts or change the structure. It is complicated and labor-intensive, and has the disadvantage of increasing manufacturing costs. Patent Document 1: Japanese Patent Application Laid-Open No. 6-95107 Patent Literature 2: Japanese Patent Application Laid-Open No. n-29583 [Summary of the Invention] The present invention is made in view of the disadvantages of the conventional backlight mechanism, and its object is to provide a By using a surface-emitting flat lamp as a light source, even in the case of a large-scale liquid crystal display device, insufficiency or non-uniformity does not occur. At the same time, the weight of the light-diffusing member or the light-diffusing member due to heat generated from the surface-emitting flat lamp are prevented. The backlight unit for a liquid crystal display device can be deformed to provide high-quality lighting, and has a small number of parts. In order to achieve the above object, the backlight unit for a liquid crystal display device of the present invention “belongs to a backlight unit for a liquid crystal display device that uses a surface-emitting flat lamp as a light source,” and is characterized in that an air layer is formed between the flat lamp and the light diffusion member, and The light diffusing member is supported by a supporting member from the back side. At this time, the support member may be disposed on the surface of the flat-light emitting flat lamp. Further, the supporting member may be formed using a transparent or transparent synthetic resin material. Also, the light diffusing member may be supported in a planar manner using a vertex of the supporting member, or in a linear or dot-like manner. 200530705 (3) In addition, the inner peripheral surface of the outer peripheral frame that holds the space between the surface-emitting flat lamp and the light diffusing member can be formed on an inclined surface that extends from the back side toward the front side. According to the backlight unit for a liquid crystal display device of the present invention, a flat-surface flat lamp is used as a light source, and therefore, even in the case of a large-sized liquid crystal display device, it can be made without insufficient illumination or unevenness. In addition, since an air layer is formed between the surface-emitting flat lamp and the light diffusing member, and the light diffusing member is supported from the back side by the support member, the weight of the light diffusing member or the heat generated by the flat lamp can be prevented. The deformation (bending) caused by the light diffusion φ member is complementary to the use of a flat lamp in the light source. High-quality lighting can be performed, the number of parts is small, the structure is simple, and no trouble is required for manufacturing, and the manufacturing cost can be made low. In addition, by arranging the support member on the surface of the flat-emitting flat lamp, the shape of the flat lamp is not restricted, and the support member can be disposed at any position, and the light diffusion can be more reliably supported by the support member. member.
又，藉由使用透明或半透明的合成樹脂材料形成支持 構件，不會產生依支持構件的照度不均勻。 H 又，使用支持構件的頂點面狀地支持光擴散構件，因 此可將依支持構件的光擴散構件的支持面積採取較大而可 更確實地支持光擴散構件，另一方面，使用支持構件的頂 點線狀或點狀地支持光擴散構件，因此不會更產生依支持 構件的照度不均勻。 又，將保持面發光扁燈與光擴散構件之間隔的外周框 的內周面形成於從背面側朝表面側擴開的傾斜面，因此實 質地可擴大扁燈的有效照射面積，並可將裝置作成小型。 -6- 200530705 (4) 【實施方式】 以下’依照圖式說明本發明的液晶顯示裝置用背光單 元的實施形態。 (實施例1 ) 在第1圖至第6圖，表示本發明的液晶顯示裝置用背 光單元的一實施例。 該液晶;不裝置用背光單兀是作爲光源使用面狀光源 ’具體上，使用如第6圖所示的螢光管所成的面發光扁燈 1，而在該扁燈1與光擴散構件3之間形成空氣層2，同 時構成藉由支持構件4從背面側支持光擴散構件3。 又，面發光扁燈1是因應於液晶顯示裝置用背光單元 的形狀組合使用一枚或適當枚數的扁燈1。 在這時候，如第1圖所示地，支持構件4是可配設在 面發光扁燈1的表面（如第6圖所示的螢光管所成的扁燈 1，是可將任一面作成表面側，惟如本實施例所示地，藉 由將具有凹凸的一側作爲表面側，可作成不會產生照度的 不均勻）。這時候，支持構件4是可接觸或未接觸於面發 光扁燈1的表面都可以。 支持構件4的形狀及材質是並未特別加以限定者，例 如本實施形態所示地，斷面形狀形成矩形的肋狀’因此可 將依支持構件4的光擴散構件3的支持面積採取較大而可 更確實地支持光擴散構件3。 -7- 200530705 (5) 又，斷面形狀形成矩形的肋狀的支持構件4 ’是隔著 數公分至數十公分，較理想是隔著數公分至十數公分左右 的間隔，等間隔地平·行或格子狀地配設。 又，支持構件4是藉由將其端部嵌合在用以保持面發 光扁燈1與光擴散構件3之間隔所配設的外周框5，加以 支持。 如此地，藉由將支持構件4配設於面發光扁燈1的表 面，不必將支持構件4拘束在扁燈1的形狀等，成爲可配 設在任意位置，藉由支持構件4可更確實地支持光擴散構 件3。 如上述地，支持構件4是可配設於面發光扁燈1的表 面，惟此外，如第3圖所示地，也可配設於面發光扁燈1 的端部（鄰接的扁燈1間），又，如第4圖所示地，視需 要，也可倂用此些的配設方法。 又’此時’支持構件4是藉由配設於面發光扁燈1的 背面側的背面板7可加以支持。 支持構件4是由透明或半透明的合成樹脂材料所形成 ’具體上’由具透明性及耐熱性的丙烯酸酯、聚碳酸酯樹 脂等所形成較理想，由此’可作成不會產生因支持構件4 所引起的照度不均勻。又，也可以不透明的合成樹脂材料 或金屬材料形成支持構件4。 又，在本實施例中’支持構件4的形狀是斷面形狀形 成矩形肋狀，此外’如第5圖所示地，形成大約三角形（ 二等邊三角形）、或是將頂點形成曲面形狀、或是形成凸 -8- 200530705In addition, by using a transparent or translucent synthetic resin material to form the support member, unevenness in illumination of the support member does not occur. H Also, since the apex of the supporting member is used to support the light diffusing member in a planar shape, the supporting area of the light diffusing member depending on the supporting member can be made large to more reliably support the light diffusing member. The vertex supports the light diffusing member linearly or in a point shape, so that unevenness of the illuminance depending on the supporting member is not generated. In addition, since the inner peripheral surface of the outer peripheral frame that holds the gap between the surface-emitting flat lamp and the light diffusing member is formed on an inclined surface that extends from the back side to the front side, the effective irradiation area of the flat lamp can be substantially enlarged, and the The device is made compact. -6- 200530705 (4) [Embodiment] Hereinafter, an embodiment of a backlight unit for a liquid crystal display device of the present invention will be described with reference to the drawings. (Embodiment 1) Figs. 1 to 6 show an embodiment of a backlight unit for a liquid crystal display device of the present invention. The liquid crystal; the backlight unit is not used, but a planar light source is used as a light source. Specifically, a surface-emitting flat lamp 1 made of a fluorescent tube as shown in FIG. 6 is used, and the flat lamp 1 and a light diffusing member are used. An air layer 2 is formed between 3, and the light diffusing member 3 is supported by the supporting member 4 from the back side. The surface-emitting flat lamp 1 is a flat lamp 1 in which one or an appropriate number is used in combination in accordance with the shape of a backlight unit for a liquid crystal display device. At this time, as shown in FIG. 1, the support member 4 can be arranged on the surface of the flat-light emitting flat lamp 1 (the flat lamp 1 made of a fluorescent tube shown in FIG. 6 can be any surface The surface side is made, but as shown in this embodiment, by making the side having unevenness as the surface side, it can be made without causing unevenness in illuminance). At this time, the supporting member 4 may be a surface that can be in contact with or not in contact with the surface-emitting flat lamp 1. The shape and material of the supporting member 4 are not particularly limited. For example, as shown in this embodiment, the cross-sectional shape is formed into a rectangular rib shape. Therefore, the supporting area of the light diffusing member 3 according to the supporting member 4 can be made larger. On the other hand, the light diffusing member 3 can be more reliably supported. -7- 200530705 (5) In addition, the rib-shaped support member 4 ′ having a rectangular cross-section is spaced from a few centimeters to a few tens of centimeters, and is preferably evenly spaced at regular intervals at intervals of a few centimeters to about ten centimeters. Or arranged in a grid pattern. The support member 4 is supported by fitting an end portion of the support member 4 to an outer peripheral frame 5 provided to maintain a space between the flat light emitting lamp 1 and the light diffusion member 3. In this way, by arranging the supporting member 4 on the surface of the surface-emitting flat lamp 1, it is not necessary to restrict the supporting member 4 to the shape of the flat lamp 1, etc., and it can be arranged at any position.地 Supporting the light diffusion member 3. As described above, the supporting member 4 can be disposed on the surface of the surface-emitting flat lamp 1, but as shown in FIG. 3, it can be disposed on the end of the surface-emitting flat lamp 1 (adjacent flat lamp 1). Time), and as shown in FIG. 4, if necessary, these arrangement methods can also be used. Also at this time, the support member 4 can be supported by a back plate 7 arranged on the back side of the surface-emitting flat lamp 1. The support member 4 is formed of a transparent or translucent synthetic resin material. Specifically, the support member 4 is preferably formed of an acrylic or polycarbonate resin having transparency and heat resistance. Therefore, the support member 4 can be made without supporting. The illuminance caused by the component 4 is uneven. The support member 4 may be formed of an opaque synthetic resin material or a metal material. In addition, in this embodiment, 'the shape of the support member 4 is a cross-sectional shape formed into a rectangular rib shape,' and as shown in FIG. 5, it is formed into a substantially triangular shape (equilateral equilateral triangle), or a vertex is formed into a curved surface shape, Or form a convex -8- 200530705
狀、甚至於形成針狀等，可形成任意形狀，由此，可將支 持構件4的頂點的光擴散構件3的支持形態作成面狀之外 ，還可作成線狀或點狀。又，在支持構件4的頂點藉由作 成面狀地支持光擴散構件3，而採用依支持構件4的光擴 散構件3的較大支持面積可更確實地支持光擴散構件3， 另一方面，在支持構件4的頂點藉由作成線狀或點狀地支 持光擴散構件3，而可作成更不會產生依支持構件4的照 度不均勻。 鲁 又，在本實施例中，將保持面發光扁燈1與光擴散構 件3之間隔的外間框5的內周面5 1形成於從背面側朝表 面側擴開的傾斜面。 由此，可實質地擴大面發光扁燈1的有效照射面積， 並可將裝置作成小型。 又，該液晶顯示裝置用背光單元，是更具體地，經由 空氣層2，將藉由支持構件4及外周框5所支持的光擴散 板3 1及光擴散片3 2所構成的光擴散構件3 (構成光擴散 · 構件3的光擴散板3 1及光擴散片3 2的層構成是任意’例 如可用複數枚光擴散片構成光擴散片3 2。）配設於作爲 光源的面發光扁燈1的表面側；藉由本體框8與推壓框9 夾持這些，而藉由卡合本體框8與推壓框9的卡合部81 ，9 1，作成一體化。又，本體框8與推壓框9的固定是也 可利用小螺釘等來進行。 這時候，在面發光扁燈1的端部1 1與本體框8之間 作成介設具緩衝性的間隔件1 0 ° 200530705 (7) 如此地，耢由將液晶顯示裝置用背光單元的構成構件 ，利用本體框8與推壓框9加以夾持並作成一體化，可簡 單地進行背光單元的裝配，同時成爲可將背光單元以半成 品進行輸送、保管寺，可提筒液晶顯不裝置的製程自由度 ，並可將製造成作成低價格。 又，在光擴散構件3的表面側配設液晶面板P，而在 面發光扁燈1的背面側配設光反射片6及背面板7，藉由 頂蓋12來覆蓋外周面而將整體作成一體化。 〇 又，外周框5，本體框8，推壓框9，頂蓋1 2等，是 以合成樹脂材料或金屬材料可形成。 如此地，上述液晶顯示裝置用背光單元，是在光源使 用面發光扁燈1之故’因而即使大型的液晶顯示裝置的情 形，也可作成不會產生照度的不足或不均勻。 又，在面發光扁燈1與光擴散構件3之間形成空氣層 2，同時藉由支持構件4從背面側支持光擴散構件3之故 ’因而可防止從光擴散構件3的本身重量或扁燈1所發生 u 的熱量所引起的光擴散構件3的變形（彎曲），與在光源 使用面發光扁燈1相輔相成，可進行高品位的照明，且零 件數少’構造簡單而製造上不需要費事，可將製造成本作 成較低。 以上，針對於本發明的液晶顯示裝置用背光單元，依 據其實施例加以說明，惟本發明是並不被限定於上述實施 例所述的構成者，在不超越其趣旨的範圍內可適當地變更 其構成者。 -10- 200530705 (8) 本發明的液晶顯示裝置用背光單元是作成不會產生不 足或不均勻’同時防止從光擴散構件的本身重量或面發光 扁燈所發生的熱量所引起的光擴散構件的變形（彎曲）， 可進行高品位的照明，且零件數少，構造簡單而製造上不 需要費事，可將製造成本作成較低，特別是較適用作爲大 型的液晶顯示裝置的背光單元。The shape of the light diffusing member 3 supporting the apex of the supporting member 4 can be formed into an arbitrary shape such as a needle shape or even a needle shape, and can also be formed into a line shape or a dot shape. The light diffusing member 3 is supported at the apex of the supporting member 4 in a planar shape, and the large supporting area of the light diffusing member 3 according to the supporting member 4 can more surely support the light diffusing member 3. On the other hand, By supporting the light diffusing member 3 at the apex of the supporting member 4 in a linear or dot shape, it is possible to make it possible to prevent unevenness in the illuminance depending on the supporting member 4. In this embodiment, the inner peripheral surface 51 of the outer frame 5 that holds the space between the surface-emitting flat lamp 1 and the light diffusing member 3 is formed on an inclined surface that extends from the back surface side to the surface side. Accordingly, the effective irradiation area of the surface-emitting flat lamp 1 can be substantially enlarged, and the device can be made compact. The backlight unit for a liquid crystal display device is, more specifically, a light diffusing member composed of a light diffusing plate 31 and a light diffusing sheet 32 supported by a supporting member 4 and a peripheral frame 5 through an air layer 2. 3 (The layer structure of the light diffusing plate 31 and the light diffusing sheet 32 constituting the light diffusing member 3 is arbitrary. For example, the light diffusing sheet 32 may be composed of a plurality of light diffusing sheets.) The front side of the lamp 1 is clamped by the main body frame 8 and the pressing frame 9, and is integrated by engaging the engaging portions 81, 91 of the main body frame 8 and the pressing frame 9. The fixing of the main body frame 8 and the pressing frame 9 may be performed by using small screws or the like. At this time, a cushioning spacer 10 is interposed between the end portion 11 of the surface-emitting flat lamp 1 and the body frame 8. 200530705 (7) In this way, the backlight unit for the liquid crystal display device is constituted The component is clamped and integrated by using the main body frame 8 and the pressing frame 9 so that the backlight unit can be easily assembled, and at the same time, the backlight unit can be transported and stored as a semi-finished product, and the liquid crystal display device can be lifted. Freedom of manufacturing process, and can be made into a low price. In addition, a liquid crystal panel P is disposed on the front side of the light diffusing member 3, and a light reflecting sheet 6 and a back plate 7 are disposed on the back side of the surface-emitting flat lamp 1. The outer peripheral surface is covered by a top cover 12 to make the entire body. Integration. 〇 The outer frame 5, the main frame 8, the pressing frame 9, the top cover 12 and the like are formed of a synthetic resin material or a metal material. As described above, the above-mentioned backlight unit for a liquid crystal display device is a surface-emitting flat lamp 1 used as a light source. Therefore, even in the case of a large-sized liquid crystal display device, it is possible to make it possible to prevent a lack of luminance or unevenness of illumination. In addition, an air layer 2 is formed between the surface-emitting flat lamp 1 and the light diffusing member 3, and at the same time, the support member 4 supports the light diffusing member 3 from the back side, thereby preventing the weight of the light diffusing member 3 from being flat or flat. The deformation (bending) of the light diffusing member 3 caused by the heat of u generated in the lamp 1 is complementary to the surface-emitting flat lamp 1 used in the light source, which can perform high-quality lighting with a small number of parts. It takes a lot of trouble to reduce the manufacturing cost. In the foregoing, the backlight unit for a liquid crystal display device of the present invention has been described with reference to the embodiments. However, the present invention is not limited to the constituents described in the above embodiments, and may be appropriately performed within a range not exceeding the purpose of the invention. Change its constituents. -10- 200530705 (8) The backlight unit for a liquid crystal display device of the present invention is made of a light diffusing member that does not cause inadequacy or non-uniformity, and prevents the light diffusing member from being caused by the weight of the light diffusing member itself or the heat generated by a flat-emitting flat lamp. It can be deformed (bent), can perform high-quality lighting, has a small number of parts, has a simple structure, and requires no trouble in manufacturing. It can reduce the manufacturing cost, and is particularly suitable as a backlight unit for large-scale liquid crystal display devices.
【圖式簡單說明】 U 第1圖是表示本發明的液晶顯示裝置用背光單元的一 實施例的局部剖視圖。 第2圖是表示同整體槪略立體圖。 第3圖是表示同支持構件的配設狀態；（a )是表示 局部立體圖；（b )是局部剖視圖。 第4圖是表示同支持構件的配設狀態的局部剖視立體 圖。 第5圖是表示同支持構件的斷面形狀的說明圖。 b 第6圖是表示同面發光扁燈；（a )是表示表面側； (b )是表示（a )的局部放大圖；（c )是表示背面側。 第7圖是表示習知的背光機構的立體圖。 第8圖是表不同側視圖。 【主要元件之符號說明】 1 :面發光扁燈 1 1 :面發光扁燈的端部 -11 - 200530705 (9) 2 :空氣層 3 =光擴散構件 3 1 :光擴散板 3 2 :光擴散片 4 :支持構件 5 :外周框 6 :光反射片 7 :背面板 8 :本體框 9 :推壓框 1 〇 :間隔件 -12-[Brief description of the drawings] Fig. 1 is a partial cross-sectional view showing an embodiment of a backlight unit for a liquid crystal display device of the present invention. Fig. 2 is a schematic perspective view showing the whole. Fig. 3 is a view showing an arrangement state of the supporting members; (a) is a partial perspective view; (b) is a partial cross-sectional view. Fig. 4 is a partially cutaway perspective view showing an arrangement state of the supporting member. Fig. 5 is an explanatory view showing a cross-sectional shape of the supporting member. b Fig. 6 is a flat-surface light emitting flat lamp; (a) is a front surface side; (b) is a partially enlarged view showing (a); (c) is a back side. Fig. 7 is a perspective view showing a conventional backlight mechanism. Figure 8 is a different side view of the watch. [Description of Symbols of Main Components] 1: Surface-emitting flat lamp 1 1: End of surface-emitting flat lamp -11-200530705 (9) 2: Air layer 3 = Light diffusion member 3 1: Light diffusion plate 3 2: Light diffusion Sheet 4: Supporting member 5: Peripheral frame 6: Light reflecting sheet 7: Back panel 8: Body frame 9: Push frame 1 〇: Spacer -12-