1361936 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種背光模組及其應用，且特別是有 關於可改變光線進入導光板之行進路徑之背光模組及其在 顯示裝置上的應用。 【先前技術】 隨著資訊、通信產業不斷地推陳出新，帶動了液晶顯 示器（Liquid Crystal Display ; LCD)市場的蓬勃發展。液晶 顯示器具有南畫質、體積小、重量輕、低驅動電壓及低消 耗功率等優點，因此被廣泛應用於個人數位助理（pers〇nal Digital Assistant ; PDA)、行動電話、攝錄放影機、筆記型 電腦、桌上型顯示器、車用顯示器、及投影電視等消費性 通訊或電子產品。加上積體電路（Integrated circuit ; 1C)產 業與液晶顯示器製造技術的突飛猛進，這些消費性通訊或 電子產品亦朝向輕、薄、短、小的趨勢發展。尤其是在電 腦產品方面，除了高性能、高速度之桌上型電腦外，攜帶 方便的筆記型電腦更是受到極大的注意與重視。 目前市場上常見之液晶顯示器大部分為背光型液晶顯 示器，這類的液晶顯示器一般主要係由前端之液晶顯示面 板以及後端之背光模組所組成。因此，背光模組為液晶顯 不器中相當關鍵之零組件之一。背光模組可依照光源入射 位置的不同分成側光式入光（Edge Lighting)與直下式入光 (Bottom Lighting)兩種’通常係運用於各種資訊、通訊、 消費產品之中，藉以提供上述液晶顯示器的一個面光源。 5 ’藉以集中光線的照射範園，而達到不同的光學效果。 根據本發明之實施例’本發明之背光模組至少包含有 =、、導光板及光偏折件。導光板係設置於光源的一側， 板至少包含有出光面及光反射面。出光面係形成 ;導先板的正面，光反射面係相對於出光面。光偏折件係 二置於光源與導光板之H中光偏折件與光源之間具有 -間隙’而光偏折件與導光板之間具有另一間隙，且光偏 折件的光折射率係不同於導光板的光折射率。 又’根據本發明之實施例，本發明之背光模組可應用 於液晶顯示裝置中。 因此，本發明之背光模組可藉由光偏折件來改變光線 的行進路徑，以達到不同的光學效果，並可減少背光模組 中的三角暗帶情形。 【實施方式】 請參照第2圖，其繪示依照本發明之第一實施例之背 光模組與液晶顯示模組的剖面示意圖。本實施例背光模組 100可組合一液晶顯示模組200，用以作為液晶顯示器 (Liquid Crystal Display ; LCD)的侧光式背光模組。背光模 組1〇〇包含有殼體110、光源120、導光板130、反射板140、 光學膜片組150及至少一光偏折件160。殼體11〇係用以裝 設光源120 '導光板130及反射板140。光源120係設置於 殼體110之一側，用以側向發光至導光板130,並由導光板 130來導引發光。反射板140設置於導光板130的下方，用 以反射發光。光學膜片組150設置於導光板130的上方， 1361936 以進行不同目的之光學改善動作。光偏折件160係設置於 光源120和導光板13〇之間，用以偏折光線進入導光板130 的方向。 如第2圖所示，本實施例之殼體11〇具有光出射口 Π1 和腔室112。光出射口 in係用以出光，在本實施例中，殼 體110可形成密閉結構之燈罩，用以避免光線從光出射口 111以外的部分洩漏出去，其中殼體110係由不透光材質所 製成’例如.塑化材料、金屬材料或上述材料之組合。腔 室112係形成於導光板130的一側，用以容置光源120，腔 至112的内側側壁112a可塗佈有光反射材質，例如金、銀、 鋁或上述材質之組合，用以使一部分未射入導光板13〇的 入射光可再反射至導光板13〇之中。其中，本實施例之光 源120例如為：冷陰極燈管（c〇M cathode Fluorescent Lamp ; CCFL)熱陰極燈管（Hot Cathode Fluorescent Lamp ; HCFL)或發光二極體（Light Emitting Diode ; LED)。 如第2圖所示，請參照第2圖至第4圖，第3圖係繪 示依照本發明之第一實施例之背光模組的局部俯視示意 圖，第4圖係繪示依照本發明之第一實施例之背光模組的 俯視示意圖。本實施例之導光板13〇係設置於光源12〇的 一側’以導引出光’導光板130例如係利用射出成型的方 式來製成平板形結構或楔形板結構，其材質例如為聚甲基 丙稀酸甲脂(ΡΜΜ A)。導光板13G包含有出光面131及^ 射面132。出光面131係位於導光板13〇的正面，且對應於 殼體110的光出射口 m，以使光線發出。出光面131 ^表 面可選擇設有複數個突出結構（未繪示），例如稜形或半圓1361936 IX. Description of the Invention: [Technical Field] The present invention relates to a backlight module and an application thereof, and more particularly to a backlight module capable of changing a path of light entering a light guide plate and a display device thereof Applications. [Prior Art] With the continuous innovation of the information and communication industry, the market for liquid crystal display (LCD) has been booming. LCD monitors are widely used in personal digital assistants (PDAs), mobile phones, video recorders, etc. Consumer communications or electronic products such as notebook computers, desktop displays, automotive displays, and projection televisions. Coupled with the rapid advancement of integrated circuit (1C) industry and liquid crystal display manufacturing technology, these consumer communications or electronic products are also moving toward light, thin, short and small trends. Especially in terms of computer products, in addition to high-performance, high-speed desktop computers, portable notebooks are highly valued and valued. Most of the liquid crystal displays currently on the market are backlight type liquid crystal displays. Such liquid crystal displays are generally composed of a liquid crystal display panel at the front end and a backlight module at the rear end. Therefore, the backlight module is one of the most critical components in the liquid crystal display. The backlight module can be divided into two types: edge lighting and Bottom Lighting according to the incident position of the light source. It is usually used in various information, communication, and consumer products to provide the above liquid crystal. A surface light source for the display. 5 ‘To achieve a different optical effect by concentrating the illumination of the light. According to an embodiment of the present invention, the backlight module of the present invention includes at least a light guide plate and a light deflecting member. The light guide plate is disposed on one side of the light source, and the plate includes at least a light emitting surface and a light reflecting surface. The light-emitting surface is formed; the front surface of the guiding plate and the light reflecting surface are opposite to the light-emitting surface. The light deflecting member is disposed between the light source and the light guide plate H, and has a gap between the light deflecting member and the light source, and another gap between the light deflecting member and the light guiding plate, and the light is deflected by the light deflecting member. The rate is different from the refractive index of the light guide plate. Further, according to an embodiment of the present invention, the backlight module of the present invention can be applied to a liquid crystal display device. Therefore, the backlight module of the present invention can change the traveling path of the light by the light deflecting member to achieve different optical effects and reduce the triangular dark band situation in the backlight module. [Embodiment] Please refer to FIG. 2, which is a cross-sectional view showing a backlight module and a liquid crystal display module according to a first embodiment of the present invention. The backlight module 100 of the present embodiment can be combined with a liquid crystal display module 200 for use as an edge-lit backlight module of a liquid crystal display (LCD). The backlight module 1A includes a housing 110, a light source 120, a light guide plate 130, a reflector 140, an optical film set 150, and at least one light deflecting member 160. The housing 11 is used to mount the light source 120' light guide plate 130 and the reflection plate 140. The light source 120 is disposed on one side of the housing 110 for laterally emitting light to the light guide plate 130, and is guided by the light guide plate 130 to emit light. The reflection plate 140 is disposed below the light guide plate 130 to reflect light. The optical film set 150 is disposed above the light guide plate 130, 1361936 for optical improvement of different purposes. The light deflecting member 160 is disposed between the light source 120 and the light guide plate 13B to deflect the direction in which the light enters the light guide plate 130. As shown in Fig. 2, the casing 11 of the present embodiment has a light exit opening Π1 and a chamber 112. The light exit port is used for light emission. In the embodiment, the housing 110 can form a lamp cover with a closed structure to prevent light from leaking out of the light exit port 111. The housing 110 is made of an opaque material. Made of, for example, a plasticized material, a metallic material, or a combination of the above. The chamber 112 is formed on one side of the light guide plate 130 for accommodating the light source 120. The inner side wall 112a of the cavity 112 may be coated with a light reflecting material such as gold, silver, aluminum or a combination thereof to make A part of the incident light that is not incident on the light guide plate 13A can be reflected again into the light guide plate 13A. The light source 120 of the present embodiment is, for example, a cathode cathode fluorescent lamp (CCFL) hot cathode lamp (HCFL) or a light emitting diode (LED). As shown in FIG. 2, please refer to FIG. 2 to FIG. 4, FIG. 3 is a partial top plan view of a backlight module according to a first embodiment of the present invention, and FIG. 4 is a schematic view of the backlight module according to the present invention. A schematic top view of the backlight module of the first embodiment. The light guide plate 13 of the embodiment is disposed on one side of the light source 12' to guide the light. The light guide plate 130 is formed into a flat plate structure or a wedge plate structure by, for example, injection molding, and the material thereof is, for example, a poly Acetyl methyl acrylate (ΡΜΜ A). The light guide plate 13G includes a light-emitting surface 131 and a light-emitting surface 132. The light exiting surface 131 is located on the front surface of the light guide plate 13A and corresponds to the light exit opening m of the housing 110 to emit light. The light-emitting surface 131 can be optionally provided with a plurality of protruding structures (not shown), such as prismatic or semi-circular
(S 8 1361936 形’藉以進一步修正光線的方向而增加聚光效果。光反 射面132係位於導光板13〇的底面，且相對於出光面⑶。 如第2圖所示，本實施例之導光板13〇可設有導光結 構（未搶示）於光反㈣132上，藉以反射導引由光源12〇 所發出的光線可由出光面131來射出，較佳為正向射出（正 向出光）4光板13〇的導光結構例如係呈連續性的v形結 構’亦即V-Cut結構（例如係利用射出成型或微切削成型 的方式來形成）、霧面結構（例如係利用喷吵處理來形成）、 散射點結構（例如係利用網板印刷或一體成型來形成），藉以 導引由光偏折件160進入導光板13〇的光線可充分地由出 光面131來射出。 值得注意的是，導光板130之出光面13丨亦可具有霧 面處理或散射點設計，藉以均勻化導光板13〇的出光，減 少出光不均（Mura)的現象。 再者’當導光板130為楔形板結構時，導光板丨3〇可 選擇未設置導光結構，而係藉由導光板13〇的楔形板結構 來形成具有斜面角度的光反射面132,以反射光線由出光面 131射出。 如第2圖所示’本實施例之反射板14〇較佳可對應於 光反射面132的形狀，以密合地設置於導光板13〇的下方， 用以使入射至光反射面132的光線形成全反射。值得注意 的是’導光板130的光反射面132亦可塗佈具有高反射率 的材料’例如金屬材料，以反射入射光線，藉以進一步取 代設置反射板140。 如第2圖所示，本實施例之光學膜片組150例如為： 9 1361936 擴散片、棱鏡片、逆棱鏡片（Turning Prism Sheet)、增亮膜 (Brightness Enhancement Film; BEF)、反射式增亮膜（Duai Brightness Enhancement Film ; DBEF)、非多層膜式反射偏 光片（Diffused Reflective Polarizer Film ; DRPF)或上述之任 意組合’其設置於導光板130的上方，用以使由導光板i3〇 的出光可再進行不同目的之光學改善動作。(S 8 1361936 is shaped to further correct the direction of the light to increase the concentrating effect. The light reflecting surface 132 is located on the bottom surface of the light guide plate 13〇 with respect to the light exit surface (3). As shown in Fig. 2, the guide of this embodiment The light plate 13A can be provided with a light guiding structure (not robbed) on the light (four) 132, whereby the light emitted by the light source 12A can be emitted by the light emitting surface 131, preferably forward (positive light output). The light guiding structure of the light plate 13 is, for example, a continuous v-shaped structure, that is, a V-Cut structure (for example, formed by injection molding or micro-cutting), and a matte structure (for example, using a squirting process) To form a scattering point structure (for example, formed by screen printing or integral molding), the light entering the light guide plate 13 by the light deflecting member 160 can be sufficiently emitted from the light emitting surface 131. Therefore, the light-emitting surface 13 of the light guide plate 130 may also have a matte surface treatment or a scattering point design, thereby uniformizing the light output of the light guide plate 13 to reduce the phenomenon of light unevenness (Mura). Further, when the light guide plate 130 is wedge-shaped When the board structure The light guide plate 3 can be selected to have no light guiding structure, and the light reflecting surface 132 having the inclined surface angle is formed by the wedge plate structure of the light guiding plate 13〇, so that the reflected light is emitted from the light emitting surface 131. As shown in FIG. The reflecting plate 14 of the present embodiment preferably corresponds to the shape of the light reflecting surface 132 so as to be closely disposed below the light guiding plate 13 , for totally reflecting the light incident on the light reflecting surface 132. It is to be noted that the light reflecting surface 132 of the light guide plate 130 may also be coated with a material having a high reflectivity such as a metal material to reflect the incident light, thereby further replacing the reflecting plate 140. As shown in Fig. 2, this embodiment The optical film set 150 is, for example: 9 1361936 diffusion sheet, prism sheet, Turning Prism Sheet, Brightness Enhancement Film (BEF), and Reflective Brightness Enhancement Film (DBEF). , a non-multilayer film reflective polarizer (DRPF) or any combination of the above, which is disposed above the light guide plate 130 for reversing the light output from the light guide plate i3 Optical improvement actions for different purposes.
如第3圖和第4圖所示，本實施例的光偏折件丨6〇係 設置於光源120與導光板130之間，光偏折件16〇例如係 以射出成型的方式來形成長形條狀，藉以使光源丨2〇的發 光可充分射入光偏折件160中，其中光偏折件16〇與光源 120之間具有一間隙，而光偏折件16〇與導光板13〇之間具 有另一間隙，亦即光偏折件16〇的兩側具有空氣介質（光折 射率為1)。其中，導光板130的光折射率ηι係不同於光偏 折件160的光折射率h，以改變光線進入導光板13〇的行 進路徑。林實施例中，錢m例如為複數個點光源（例 如為發光二極體）’其排列設置於導光板13〇的一側，導光 板130的光折射率ni例如為1.4。此時，光偏折件160的 光折射率n2可例如小於導光板13㈣光折射率^，較佳為 實質介於1與1.4之間，且接近i(例如i 。因此，當光源 120的光線人射至導光板130時，光線可在進人導光板130 後進一步朝兩側橫向偏移’因而擴大光線在導光板i30中 的照射範圍’進而減少此些點光源之間的三角暗帶情形， 增加顯示可視區的面積。且由於光偏折件⑽的兩側具有 相同光折射率的介質（空氣），因而光線在進人光偏折件16〇 前後的方向仙互平行，亦即総可料光偏折件ι6〇來 10 例間之相異處進行說明’而其相似處則在此不再贅述。相 較於第一實施例，第三實施例之背光模組100包含有至少 一光源120c和二光偏折件16〇c，其分別設置於導光板13〇 的兩側。此時，此些光偏折件16〇c可分別導引光線由導光 板130的兩側來進入導光板13〇中，藉以增加背光模組1〇〇 的背光量，而可適用於大尺寸之背光模組1〇〇，並可藉由光 偏折件160c來改變光線在導光板13〇中的入射情形。 请參照第7A圖和第7B圖，其繪示依照本發明之第四 實施例之背光模組的局部俯視示意圖。以下僅就本實施例 與第一實施例間之相異處進行說明，而其相似處則在此不 再贅述。相較於第一實施例，第四實施例之背光模組1〇〇 叹有複數個光偏折件i6〇d’此些光偏折件16〇d的光折射率 係相互不同，且不同於導光板13〇的光折射率 n，例如.1.1 ' 1 ·2及1.3，藉以漸進地改變光線的行進路 I，而擴大或集中光線在導光板i30中的照射範圍。值得 /主意的疋，此時，此些光偏折件丨60d相互之間可選擇未具 有間隙（如第7A圖所示）或具有間隙（如第7B圖所示），以漸 進地改變光線的行進路徑。 由上述本發明的實施例可知，本發明之背光模組及其 應用可藉由光偏折件來改變光線的行料徑1擴大或集 令光線在導光板中的照射範圍’達到不同的光學效果(例如 減少三角暗帶情形）。 . 雖然本發明已以實施例揭露如上，然其並非用以限定 本發明任何熟習此技藝者，在不脫離本發明之精神和範 圍内田可作各種之更動與潤飾，因此本發明之保護範圍 1361936 當視後附之申請專利範圍所界定者為準。 » - 【圖式簡單說明】 為讓本發明之上述和其他目的、特徵、優點與實施例 能更明顯易懂，所附圖式之詳細說明如下： -第1A圖係依照習知技術一種側光式背光模組的俯視 示意圖。 第1 B圖係依照習知技術另一種側光式背光模組的局 • 部側視示意圖。 第2圖係繪示依照本發明之第一實施例之背光模組與 • 液晶顯示模組的局部剖面示意圖。 ； 第3圖係繪示依照本發明之第一實施例之背光模組的 局部俯視示意圖。 第4圖係繪示依照本發明之第一實施例之背光模組的 俯視示意圖。 帛5 ®係緣示依照本發明之第二實施例之背光模組的 局部剖面示意圖。 第6圖係繪示依照本發明之第三實施例之背光模組的 局部剖面示意圖。 ^第7A圖和第7B圖係繪示依照本發明之第四實施例之 者光模組的局部俯視示意圖。 【主要元件符號說明】 ηι、n2、n3、n4 :光折射率 1 〇〇 ·背光模组 d、山：距離 110 :殼體 (S ) 1361936As shown in FIG. 3 and FIG. 4, the optical deflecting member 6 of the present embodiment is disposed between the light source 120 and the light guide plate 130, and the optical deflecting member 16 is formed, for example, by injection molding. The shape of the strip is such that the light of the light source 丨2 可 can be sufficiently injected into the light deflecting member 160, wherein the light deflecting member 16 〇 has a gap between the light source 120 and the light deflecting member 16 〇 and the light guide plate 13 There is another gap between the crucibles, that is, the air deflecting member 16 has an air medium (refractive index of light 1) on both sides. The light refractive index ηι of the light guide plate 130 is different from the light refractive index h of the light deflecting member 160 to change the traveling path of the light entering the light guide plate 13A. In the embodiment, the money m is, for example, a plurality of point light sources (e.g., light-emitting diodes) disposed on one side of the light guide plate 13A, and the light refractive index ni of the light guide plate 130 is, for example, 1.4. At this time, the light refractive index n2 of the light deflecting member 160 may be, for example, smaller than the light refractive index ^ of the light guide plate 13 (four), preferably substantially between 1 and 1.4, and close to i (for example, i. Therefore, when the light source 120 is lighted When a person hits the light guide plate 130, the light can be laterally shifted toward the two sides after entering the light guide plate 130, thereby expanding the illumination range of the light in the light guide plate i30, thereby reducing the triangular dark band between the light sources. , increasing the area of the visible area, and because the light deflecting member (10) has the same refractive index medium (air) on both sides, the light is parallel to the direction before and after entering the light deflecting member 16〇, that is, 総The light-deflecting member ι6 〇 is described in the difference between the ten cases, and the similarities are not described herein. The backlight module 100 of the third embodiment includes at least the first embodiment. A light source 120c and two light deflecting members 16〇c are respectively disposed on two sides of the light guide plate 13A. At this time, the light deflecting members 16〇c can respectively guide the light from the two sides of the light guide plate 130. Entering the light guide plate 13〇, thereby increasing the backlight of the backlight module 1〇〇, It can be applied to a large-sized backlight module 1〇〇, and the incident condition of light in the light guide plate 13〇 can be changed by the light deflecting member 160c. Please refer to FIG. 7A and FIG. 7B, which are illustrated according to the present invention. A partial top view of the backlight module of the fourth embodiment of the present invention. Only the differences between the present embodiment and the first embodiment will be described below, and the similarities are not described herein again. In the embodiment, the backlight module 1 of the fourth embodiment has a plurality of light deflecting members i6〇d'. The light refractive indices of the light deflecting members 16〇d are different from each other and different from the light guide plate 13〇. The refractive index n of the light, for example, .1.1 '1 · 2 and 1.3, thereby gradually changing the traveling path I of the light, and expanding or concentrating the illumination range of the light in the light guide plate i30. Worth/ideal, at this time, The light deflecting members 60d may be selected from each other without a gap (as shown in FIG. 7A) or with a gap (as shown in FIG. 7B) to gradually change the traveling path of the light. For example, the backlight module of the present invention and its application can be modified by optical deflecting parts. The row diameter 1 of the light expands or sets the illumination range of the light in the light guide plate to achieve different optical effects (for example, reducing the triangular dark band condition). Although the invention has been disclosed above by way of example, it is not intended to limit A person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention, and therefore the scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious, the detailed description of the drawings is as follows: - Figure 1A is an edge-lit backlight according to the prior art. A schematic plan view of the module. Fig. 1B is a side view of a side view of another edge-lit backlight module according to the prior art. 2 is a partial cross-sectional view showing a backlight module and a liquid crystal display module according to a first embodiment of the present invention. Fig. 3 is a partial top plan view showing a backlight module in accordance with a first embodiment of the present invention. Figure 4 is a top plan view showing a backlight module in accordance with a first embodiment of the present invention.帛5® is a partial cross-sectional view of a backlight module in accordance with a second embodiment of the present invention. Figure 6 is a partial cross-sectional view showing a backlight module in accordance with a third embodiment of the present invention. Fig. 7A and Fig. 7B are partial top plan views showing an optical module according to a fourth embodiment of the present invention. [Main component symbol description] ηι, n2, n3, n4: refractive index 1 〇〇 · backlight module d, mountain: distance 110: housing (S) 1361936
111 :光出射口 112 ： 腔室 112a :内側側壁 120、120b、120c :光源 130 :導光板 131 ： 出光面 132 :光反射面 140 :反射板 150 ： 光學膜片組 160、160c、160d :光偏折件 161 ： 入光面 200 :液晶顯示模組 901 :可視區 910 :背光模組 911 : 導光板 912 :側向光源 913 ： 三角形暗帶 920 :背光模組 921 ： 導光板 922 :側向光源111: light exit opening 112: chamber 112a: inner side wall 120, 120b, 120c: light source 130: light guide plate 131: light emitting surface 132: light reflecting surface 140: reflecting plate 150: optical film group 160, 160c, 160d: light Folding member 161: light-incident surface 200: liquid crystal display module 901: visible area 910: backlight module 911: light guide plate 912: lateral light source 913: triangular dark band 920: backlight module 921: light guide plate 922: lateral direction light source
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