200819856 九、發明說明： 【發明所屬之技術領域】 本發明係關於-種直下式背光模組及採用該直 光模組之液晶顯示裝置。 【先前技術】200819856 IX. Description of the Invention: [Technical Field] The present invention relates to a direct type backlight module and a liquid crystal display device using the same. [Prior Art]
液晶顯不裝置因具有低輻射性、體積輕薄短小及耗電 低等特點，且隨著相關技術之成熟及創新，種類日益繁多， 被廣泛應用於手機、個人數位助理、便攜式數位視訊光碟 播放器（Digital Video Disc，DVD)、筆記型電腦、個人電腦 及電視等領域。然而，由於液晶顯示面板本身不具發光特 性，所以必須配合一定背光光源才能達到顯示效果。X 隨著液晶顯示裝置尺寸、構造及用途的不同，背光模 組的結構也有不同。目前，背光模組依據光源設置位置之 不同’主要有侧光式及直下式兩種。直下式背光模組係將 光源排列於模組正下方，以獲得較強之輝度，主要應用於 較大尺寸之液晶顯示裝置，如液晶電視。 請參閱圖1，係一種先前技術液晶顯示裝置之剖面示 意圖。該液晶顯示裝置10包括一液晶顯示面板Η及與該 液晶顯示面板11層疊設置之一直下式背光模組1〇〇。該直 下式背光模組100包括一具有光滑平面結構之反射片 110，一擴散板120，複數光源130及一背板140。該反射 片110與該背板140層疊設置，該擴散板120設置於該反 射片110上方並與該反射片110構成一收容空間以收容該 複數光源130,該複數光源130並列設置於該反射片11〇 與該擴散板120之間，該光源130之中心至該反射片110 200819856 之距離定義為Η。該複數光源130係冷陰極螢光燈管。 自該複數光源130發出之光線，部份直接經該擴散板 120擴散後進入該液晶面板11，另一部份經該反射片11 〇 反射，再經該擴散板120擴散後進入該液晶顯示面板η， 從而達到提供照明之目的。 光源130發出之光線al、a2投射於該反射片11()之表 面，經該反射片110反射後沿光源130之邊緣射出。al與 a2所夾之角度係j。光線a3、a4係al、a2所夾之任音兩 束光線，其投射於該反射片110之表面，經該反射片 反射後被光源130本身阻擋而無法射出。可見，由於光源 130本身體積具有遮蔽作用’ ai、a2所夾之^角度範圍内 的所有光線被其阻擋而無法射出，從而使得這一部份的光 能量不能被有效利用。光源13〇之中心至該反射片11〇之 距離Η越大，α越小，光源13〇本身體積所遮蔽之光線越 少；反之，Η越小，α則越大，光源13〇本身體積所遮蔽 之光線越多。 雖然可通過增大該光源13〇至該反射片11〇之距離Η 以減小=，從而減少由於光源13〇本身體積之遮蔽作用導 致光能量之損失，提高光利用率，但勢必會增大該直下式 背光拉組100之厚度’不符合液晶顯示I置輕薄化的趨勢。 有鑑於此 下式背光模組 有必要提供一種可有效提高光利用率之直 還有必要提供一 示裝置。 種採用該直下式背光模組之液晶顯 200819856 一種直下式背光模組，其包括一反射片、一擴散板， 以及位於該反射片與該擴散板之間之複數光源，該反射片 包括設置於該複數光源正下方之複數第一反射凸塊及分別 設置於二相鄰第一反射凸塊中間之複數第二反射凸塊，該 第一反射凸塊及該第二反射凸塊之表面均係二對稱曲面， 該第二反射凸塊之曲面面積大於該第一反射凸塊之曲面面 積，以使得該第二反射凸塊易接收該複數光源發射並經該 複數第一反射凸塊反射之部份光線，將其二次反射後射出 該擴散板。 一種液晶顯示裝置，其包括一液晶顯示面板及一與該 液晶顯示面板層疊設置之直下式背光模組。該直下式背光 模組包括一反射片、一擴散板，以及位於該反射片與該擴 散板之間之複數光源，該反射片包括設置於該複數光源正 下方之複數第一反射凸塊及分別設置於二相鄰第一反射凸 塊中間之複數第二反射凸塊，該第一反射凸塊及該第二反 射凸塊之表面均係二對稱曲面，該第二反射凸塊之曲面面 積大於該第一反射凸塊之曲面面積，以使得該第二反射凸 塊易接收該複數光源發射並經該複數第一 部份光線，將其：次反職射㈣擴餘。^塊反射之 相較於先前技術，本發明利用該第一反射凸塊及該第 二反射凸塊之表面對光的二次反射，可有效解決由於= 本身，積之遮蔽作用導致部份光能量無法利用之弊端 而提高光能量之利用率’增大該直下式背光模組及採用盆 之液晶顯示裝置之出光輝度。 /、 【實施方式】 200819856 請參閱圖2,係本發明液晶顯示裝置第一實施方式之 剖面示意圖。該液晶顯示裝置20包括層疊設置之一液晶顯 示面板21及一直下式背光模組200,該背光模組200為該 液晶顯示面板21提供面光源。該直下式背光模組200包括 一反射片210，一擴散板220，複數線光源230及一背板 240。該反射片210與該背板240層疊設置，該擴散板220 設置於該反射片210上方，並與該反射片210構成一收容 空間以收容該複數線光源230，該複數線光源230並列設 置於該反射片210與該擴散板220之間，其與該反射片210 及該擴散板220之間均有一定距離。該複數線光源230係 冷陰極螢光燈管。 請一併參閱圖3，係圖2所示反射片210之局部立體 示意圖。該反射片210包括複數第一反射凸塊211及複數 第二反射凸塊212。該第一反射凸塊211與該第二反射凸 塊212間隔排佈。該第一反射凸塊211及該第二反射凸塊 212均係相互平行之長條形。該第一反射凸塊211之橫截 面及該第二反射凸塊212之橫截面均係尖角形狀，該第一 反射凸塊211之表面係由一頂部2111向該背板240延伸之 二對稱反射曲面2112,該第二反射凸塊212之表面係由一 頂部2121向該背板240延伸之二對稱反射曲面2122。該 第一反射凸塊211之反射曲面2112的面積小於該第二反射 凸塊212之反射曲面2122的面積。 該第一反射凸塊211位於該線光源230正下方，每個 第二反射凸塊212位於二相鄰第一反射凸塊211中間位 置。該第一反射凸塊211及該第二反射凸塊212沿線光源 200819856 230方向延伸，其線性尺寸不小於該線光源230之長度， 不大於該反射片210之長度。 該複數第一反射凸塊211及該複數第二反射凸塊212 與該反射片210 —體成型。 光線Al、A2及A3、A4分別係二相鄰線光源230投 射於該第一反射凸塊211之反射曲面2112之光線，A1與 A2所夾之角度、A3與A4所夾之角度均係石。光線A1、 A2及A3、A4經該第一反射凸塊211之反射曲面2112反 射至該第二反射凸塊212之反射曲面2122,再經該第二反 射凸塊212之反射曲面2122二次反射後射出該擴散板 220。光線A5、A6及A7、A8分別係光線Al、A2及A3、 A4所夾之任意兩束光線，經該第一反射凸塊211之反射曲 面2112及該第二反射凸塊212之反射曲面2122二次反射 後射出擴散板220。可見，光線Al、A2及A3、A4及其分 別所夾之/3角度範圍内的所有光線均可經該第一反射凸塊 211之反射曲面2112及該第二反射凸塊212之反射曲面 2122二次反射後射出該擴散板220，該部份光能量得以利 用。 相較於先前技術，由於該第一反射凸塊211及該第二 反射凸塊212之表面均係曲面，其接收由該光源230發射 之光線的面積較大，可使得兩相鄰線光源230正下方部份 發射之光線盡可能被二次反射後射出擴散板220而得以利 用，從而提高該直下式背光模組200及該液晶顯示裝置20 之光利用率；更進一步，由於該第二反射凸塊212之高度 及反射曲面2122之面積較該第一反射凸塊211之高度及反 11 200819856 射曲面2112之面積大，故該第二反射凸塊212易接收該第 一反射凸塊211反射之光線並將該部份光線二次反射後射 出該擴散板220,從而進一步提高該直下式背光模組2〇〇 及該液晶顯示裝置20之光利用率。 請參閱圖4,係本發明液晶顯示裝置第二實施方式之 剖面示意圖。該液晶顯示裝置3〇與該第一實施方式之直下 式月光模組20具有相似之結構，不同之處在於：該反射片 310之複數第一反射凸塊311之橫截面係尖角形狀，其表 面係由一頂部3111向該背板34〇延伸之二對稱反射曲面 3112，該第二反射凸塊312之橫截面係圓弧形，其 二對稱反射曲面3122。 ' 上述各實施方式之第一反射凸塊及第二反射凸塊不限 於與反射片一體成型，亦可通過將該第一反射凸 反射凸塊安裝於反射片表面形成。 一 上述各實施方式採用之反射片、第一反射凸塊及第二 反射凸塊係以高反射率之塑膠基材製作或以鋁擠型 高反射率直陽極處理製成。 … 綜上所述，本發明確已符合發明之要件，爰依法提出 專利申請。惟’以上所述者僅為本發明之較佳實施方式， 本發明之範圍並不以上述實施方式為限，舉凡熟習本案技 藝之人士援依本發明之精神所作之等效修飾或變化，皆 涵蓋於以下申請專利範圍内。 … 【圖式簡單說明】 圖1係一種先前技術之液晶顯示裝置剖面示意圖。 圖2係本發明液晶顯示裝置第一實施方式之剖面示意圖。 12 200819856 圖3係圖2所示反射片之局部立體示意圖。 圖4係本發明液晶顯示裝置第二實施方式之剖面示意圖 【主要元件符號說明】 液晶顯示裝置 20、30 直下式背光模組 200 液晶顯不面板 21 反射片 210 、 310 第一反射凸塊 211 、 311 頂部 2111 、 2121 、 3111 第二反射凸塊 212 、 312 反射曲面 2112 、 2122 、 3112 、 3122 擴散板 220 光源 230 背板 240 、 340 光線 Al、A2、A3、A4、A5、A6、A7、A8 13Due to its low radiation, small size, short power consumption and low power consumption, LCD display devices are widely used in mobile phones, personal digital assistants, and portable digital video disc players due to the maturity and innovation of related technologies. (Digital Video Disc, DVD), notebook computers, personal computers and televisions. However, since the liquid crystal display panel itself does not have a light-emitting characteristic, it is necessary to match a certain backlight source to achieve the display effect. X The structure of the backlight module differs depending on the size, configuration, and use of the liquid crystal display device. At present, the backlight module has two different types of sidelight type and direct type depending on the position of the light source. The direct-lit backlight module arranges the light source directly under the module to obtain a strong brightness, and is mainly applied to a larger-sized liquid crystal display device such as a liquid crystal television. Referring to Figure 1, a cross-sectional view of a prior art liquid crystal display device is shown. The liquid crystal display device 10 includes a liquid crystal display panel and a direct-type backlight module 1A stacked on the liquid crystal display panel 11. The direct-lit backlight module 100 includes a reflective sheet 110 having a smooth planar structure, a diffusing plate 120, a plurality of light sources 130, and a backing plate 140. The reflective sheet 110 is disposed on the backing plate 140. The diffusing plate 120 is disposed above the reflective sheet 110 and forms a receiving space with the reflective sheet 110 to receive the plurality of light sources 130. The plurality of light sources 130 are juxtaposed on the reflective sheet. Between 11 〇 and the diffuser 120, the distance from the center of the light source 130 to the reflective sheet 110 200819856 is defined as Η. The complex light source 130 is a cold cathode fluorescent lamp. The light emitted from the plurality of light sources 130 is diffused directly into the liquid crystal panel 11 through the diffusion plate 120, and the other portion is reflected by the reflection sheet 11 and diffused through the diffusion plate 120 to enter the liquid crystal display panel. η, thus achieving the purpose of providing illumination. Light rays a1 and a2 emitted from the light source 130 are projected on the surface of the reflection sheet 11 (), reflected by the reflection sheet 110, and emitted along the edge of the light source 130. The angle between al and a2 is j. The light rays a3, a4, and a2 are the two beams of light, which are projected on the surface of the reflection sheet 110, are reflected by the reflection sheet, and are blocked by the light source 130 itself and cannot be emitted. It can be seen that since the light source 130 itself has a shielding effect, the light in the range of angles enclosed by 'ai and a2' is blocked by it and cannot be emitted, so that the light energy of this part cannot be effectively utilized. The larger the distance from the center of the light source 13〇 to the reflection sheet 11〇, the smaller the α is, the less the light is blocked by the volume of the light source 13 itself; on the contrary, the smaller the Η, the larger the α, and the volume of the light source 13 itself. The more light is blocked. Although it is possible to reduce the distance Η of the light source 13 〇 to the reflection sheet 11〇, thereby reducing the loss of light energy due to the shielding effect of the volume of the light source 13 itself, and improving the light utilization efficiency, it is bound to increase. The thickness of the direct type backlight pull group 100 does not conform to the tendency of the liquid crystal display I to be light and thin. In view of the need for this type of backlight module, it is necessary to provide a display device which can effectively improve the light utilization efficiency. Liquid crystal display using the direct type backlight module 200819856 A direct type backlight module comprising a reflection sheet, a diffusion plate, and a plurality of light sources between the reflection sheet and the diffusion plate, the reflection sheet comprising a plurality of first reflective bumps directly under the plurality of light sources and a plurality of second reflective bumps respectively disposed between the two adjacent first reflective bumps, wherein the surfaces of the first reflective bumps and the second reflective bumps are a second symmetrical curved surface, the curved surface area of the second reflective bump is larger than the curved surface area of the first reflective bump, such that the second reflective bump is apt to receive the portion of the plurality of light sources that are emitted by the plurality of first reflective bumps and reflected by the plurality of first reflective bumps The light is reflected twice and then emitted out of the diffuser. A liquid crystal display device includes a liquid crystal display panel and a direct type backlight module laminated with the liquid crystal display panel. The direct-lit backlight module includes a reflective sheet, a diffusing plate, and a plurality of light sources between the reflective sheet and the diffusing plate, the reflective sheet includes a plurality of first reflective bumps disposed directly below the plurality of light sources and respectively And a plurality of second reflective bumps disposed between the two adjacent first reflective bumps, wherein the surfaces of the first reflective bump and the second reflective bump are two symmetric curved surfaces, and the curved surface area of the second reflective bump is greater than The curved surface area of the first reflective bump is such that the second reflective bump is apt to receive the plurality of light sources and pass through the plurality of first partial rays, and the second counter-radiation (four) is expanded. Compared with the prior art, the present invention utilizes the secondary reflection of light by the surfaces of the first reflective bump and the second reflective bump, which can effectively solve the partial light caused by the shielding effect of the product itself. The use of energy can not be used to improve the utilization of light energy. Increasing the brightness of the direct-lit backlight module and the liquid crystal display device using the basin. [Embodiment] 200819856 Please refer to Fig. 2, which is a cross-sectional view showing a first embodiment of a liquid crystal display device of the present invention. The liquid crystal display device 20 includes a liquid crystal display panel 21 and a continuous backlight module 200. The backlight module 200 provides a surface light source for the liquid crystal display panel 21. The direct-lit backlight module 200 includes a reflective sheet 210, a diffusing plate 220, a plurality of linear light sources 230, and a backing plate 240. The reflective sheet 210 is disposed on the backing plate 240. The diffusing plate 220 is disposed above the reflective sheet 210 and forms a receiving space with the reflective sheet 210 to receive the plurality of linear light sources 230. The plurality of linear light sources 230 are arranged side by side. The reflection sheet 210 and the diffusion plate 220 have a certain distance from the reflection sheet 210 and the diffusion plate 220. The complex line source 230 is a cold cathode fluorescent lamp. Referring to FIG. 3 together, a partial perspective view of the reflective sheet 210 shown in FIG. 2 is shown. The reflective sheet 210 includes a plurality of first reflective bumps 211 and a plurality of second reflective bumps 212. The first reflective bumps 211 are spaced apart from the second reflective bumps 212. The first reflective bump 211 and the second reflective bump 212 are both elongated strips parallel to each other. The cross section of the first reflective bump 211 and the cross section of the second reflective bump 212 are both pointed. The surface of the first reflective bump 211 is symmetrically extended from the top portion 2111 to the back plate 240. The surface of the second reflective bump 212 is a two-symmetric reflective curved surface 2122 extending from the top portion 2121 to the back plate 240. The area of the reflective curved surface 2112 of the first reflective bump 211 is smaller than the area of the reflective curved surface 2122 of the second reflective bump 212. The first reflective bumps 211 are located directly below the line light source 230, and each of the second reflective bumps 212 is located at an intermediate position between two adjacent first reflective bumps 211. The first reflective bump 211 and the second reflective bump 212 extend in the direction of the line source 200819856 230, and the linear dimension thereof is not less than the length of the line source 230 and not greater than the length of the reflective sheet 210. The plurality of first reflective bumps 211 and the plurality of second reflective bumps 212 are integrally formed with the reflective sheet 210. The light rays A1, A2, and A3, A4 are the rays of the two adjacent line light sources 230 projected on the reflective curved surface 2112 of the first reflective bump 211, and the angles between A1 and A2, and the angles between A3 and A4 are both stones. . The light rays A1, A2, and A3, A4 are reflected by the reflective curved surface 2112 of the first reflective bump 211 to the reflective curved surface 2122 of the second reflective bump 212, and then re-reflected by the reflective curved surface 2122 of the second reflective bump 212. The diffusion plate 220 is then ejected. The light rays A5, A6, and A7 and A8 are respectively two light beams sandwiched by the light rays A1, A2, and A3 and A4, and the reflective curved surface 2112 of the first reflective bump 211 and the reflective curved surface 2122 of the second reflective bump 212. After the second reflection, the diffusion plate 220 is emitted. It can be seen that all the light rays in the range of the angles of the light beams A1, A2 and A3, A4 and their respective angles of 3 can pass through the reflective curved surface 2112 of the first reflective bump 211 and the reflective curved surface 2122 of the second reflective bump 212. After the second reflection, the diffusion plate 220 is emitted, and the portion of the light energy is utilized. Compared with the prior art, since the surfaces of the first reflective bump 211 and the second reflective bump 212 are curved, the area of the light emitted by the light source 230 is large, so that two adjacent linear light sources 230 can be made. The light emitted from the portion directly below is reflected as much as possible after being reflected by the diffusion plate 220, thereby improving the light utilization efficiency of the direct type backlight module 200 and the liquid crystal display device 20; further, due to the second reflection The height of the bump 212 and the area of the reflective curved surface 2122 are larger than the height of the first reflective bump 211 and the area of the reverse curved surface 2112. Therefore, the second reflective bump 212 is apt to receive the first reflective bump 211. The light is reflected by the second light and then emitted from the diffusing plate 220, thereby further improving the light utilization efficiency of the direct type backlight module 2 and the liquid crystal display device 20. Referring to Figure 4, there is shown a cross-sectional view of a second embodiment of a liquid crystal display device of the present invention. The liquid crystal display device 3 has a similar structure to the direct-type moonlight module 20 of the first embodiment, except that the cross-section of the plurality of first reflective bumps 311 of the reflective sheet 310 is a sharp-angled shape. The surface is a two-symmetric reflective curved surface 3112 extending from the top portion 3111 to the back plate 34. The second reflective bump 312 has a circular arc shape in cross section, and the second symmetric reflective curved surface 3122. The first reflection bump and the second reflection bump of each of the above embodiments are not limited to being integrally formed with the reflection sheet, and may be formed by attaching the first reflection convex reflection bump to the surface of the reflection sheet. The reflective sheet, the first reflective bump and the second reflective bump used in each of the above embodiments are made of a high reflectivity plastic substrate or an aluminum extruded high reflectance direct anode treatment. ... In summary, the present invention has indeed met the requirements of the invention, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It is covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing a prior art liquid crystal display device. 2 is a schematic cross-sectional view showing a first embodiment of a liquid crystal display device of the present invention. 12 200819856 FIG. 3 is a partial perspective view of the reflective sheet shown in FIG. 2. 4 is a schematic cross-sectional view showing a second embodiment of the liquid crystal display device of the present invention. [Main element symbol description] Liquid crystal display device 20, 30 Direct type backlight module 200 Liquid crystal display panel 21 Reflecting sheet 210, 310 First reflective bump 211, 311 top 2111, 2121, 3111 second reflective bumps 212, 312 reflective curved surface 2112, 2122, 3112, 3122 diffuser 220 light source 230 backplane 240, 340 light Al, A2, A3, A4, A5, A6, A7, A8 13