200807099 九、發明說明 【發明所屬之技術領域】 本發明係有關於-種背光模組，特別是有關於一種防漏 光之側光式背光模組。 【先前技術】 液晶顯示裝置通常由顯示面板與背光模組所組成，背 光模組的主要功能係在提供足夠的亮度以及分布均勻的光 源，以使液晶顯不器能夠顯示影像。一般而言，背光模組 可分為直下式（Direet-type)與侧光式（Edge,pe)兩種 設計，其中直下式的設計係將光⑨（例如螢光㈣或發光 一極體）设置於背光模組的正下方，而彳目丨止斗、 々 而側先式的設計則是 將光源設置於背光模組的側邊。 睛參照第1A圖，係緣示一藉羽土 > , 種1知之側光式背光模組 1〇的剖面結構示意圖。側光式背光 一IΛ 月尤衩組1 〇係位於液晶顯 不面板1 2的下方，此側光式背夯煜 月九杈組10主要係包含有光 源20、光源反射罩30、導光板4〇、 u / , 久射片50以及光學膜 片（未繪示），此光學膜片可以是、 置於V光板40上方，其中光源反射 ^ Λ 射罩3 〇係具有夾制部3 0a 14承载部3 Ob，光源2 0係設置於 袁於反射罩3〇中，導夯 之板端套設於光源反射罩30、板4〇 50設置於光诉矣輩3〇 开处（未標示），反射片 又置於先源反射罩30之承栽部_上 的光線可直接或是經過光源反射 "、 射出 4〇的端面40a射入導光板4〇内 士、反射後，自導光板 内，經由在導光板40底面刻 200807099 意设置的網點以破壞光線的^ ^ ^ ^ ^ ^ ^ ^ 利之光源射出面（未標示）射出反^ =朝向，光板 線盡可能地朝向導光板4〇 肖則疋讓先 n 尤源射出面射出，以達光源的 充刀利用。敢理想的情況為光線進入導光板化後，因全反 射關係光線會完全被限制在導 破壞全反射停件後，^由網點散射 ㈣件後，先線再朝向導光板的射出面射出，以 達到顯不面板亮度與均勻性的要求。 4。之=由4於導光板4〇製作與組裝搬運的因素，導光板 角40b而“0&與頂底面的交界處無法完全垂直，而是有圓 由圓角4〇b ^ )產生，^會使得光源所產生的部分光線經 =角二〇b面進入到導光板4〇。當此部分光線經由圓角_ =板40後因入射角度關係’於導光板4〇内頂底面 = 臨界角，因此沒有全反射的情形產生，即光 r ‘光板4〇而造成漏光，而非經由網點的散射， 如弟1B圖m 也會由 ，、。匕外，由於機構設計的問題，使得光線 ."..板4〇頂底面與機構間隙60進入導光板40，此 尤綠亦如由圓&、备y 、皆 鸯A+ ¥光板的光線一樣未經全反射與網點 月文射即射出m 解決方弋立板而嶮成漏光，如第1 c圖所示。現階段 t卜合大部分是增加遮光區域12a來擋掉漏光，但是如 此^讓顯示裝署绘銘广 & .nu 緣額區70的距離增加。一般來說，經由圓 月斗0 b面進入塞、 播住，_ 導光板40, 一次折射漏光可以被遮光區域12a ^ m ^ 人折射漏光的距離為2xtxtan(0c)，t為導光板40 的7予度，9C Λ道土』r 产糸0 两導光板4〇材質的臨界角，假設導光板40厚 度為8mm，陟旯& & I角為4 2度，所以二次折射漏光的距離為 200807099 14.4mm(如第1C圖所示），對於顯示器而言，這樣的緣額 區7 0的距離實在是太大了。 另一種解決漏光的方式，如第1D圖所示，是將光源 反射罩30之開口做得比導光板40的厚度小，然後組裝時 用導光板40將光源反射罩30撐開，使導光板4〇與光源反 射罩30之上下機構的間隙消失，以減少因為機構間隙所造 成的漏光現象。但因為圓角40b漏光還是無法解決，所以 還是要靠網點與增加緣額區70的方式來解決漏光所造成 之光源不均勻的現象。此外，還有另一種解決漏光的方式， 如第1E圖所示，係利用加入暈度較高的擴散片8〇於導光 板40的上方，來將漏光打散到整個擴散片8〇，但是這會 使得光源的亮度下降，影響到顯示器的顯示品質。 【發明内容】 因此，非常需要一種改良的側光式背光模組，來解決習 知結構中漏光的問題，以達到有效防止漏光的目的。 本發明之一方面係在於提供一種防漏光之背光模組，藉 由改變光源反射罩之側壁開口的大小，使得光線能實質地經 由鄰接光源之端面射入導光板，來防止可能的漏光路線，因 而貫質地解決圓角與機構空隙所造成的漏光問題。在不增加 任何其他結構元件之下，僅藉由改變光源反射罩之側壁開口 的设計’就可以幾乎封閉住所有可能的漏光路線，並使得光 源所產生的光線皆能實質地經由端面部分射入導光板，因此 達到防止漏光的目的。 200807099 根據本發明之一較佳實施例，此背光模組，至少包含光 源、反射罩以及導光板，其中光源反射罩具有：用來容置導 光板的第一凹槽以及用以容置該光源的第二凹槽。第一凹槽 具有底面以及第一開口。第二凹槽具有設置於第一凹槽底面 的第二開口，且第二開口小於底面之尺寸。導光板具有第一 平面二相對於第一平面之光出射面以及一個端面，其中端面 分別猎由第一導角部以及第二導角部與第一平面和光反射面 ，接。端面之尺寸大於或等於第二開口，且第一導角部與該 第二導角部位於第一凹槽内，使端面遮蓋第二開口。本發明 的另一方面就是在提供一種具有防漏光之背光模組之顯示裝 置。根據本發明之另一較佳實施例，此顯示裝置，至少包含： 一顯示面板以及上述之背光模組。 另外依照本發明一較佳實施例，上述之光源反射罩的材 質可例如是金屬或塑膠。 依肢本發明一較佳實施例，上述之光源可例如是發光二 極體（LED)或冷陰極管（CCFL)。 應用上述防漏光的側光式背光模組，由於是利用縮小光 源反射罩之側壁的開口大小，使得光源所直接射出或經由側 壁反射之光線，能實質地完全經由鄰接光源的端面射入至導 光板中，而不會從圓角（導角）或機構間隙射入至導光板。 因此，本發明可克服習知技術之無法防止漏光的缺點。所以 本發明與纟它習知結構相&，本發明的側％式背光模組可有 效且實質地防止漏光。 200807099 【實施方式】 ▲為讓本發明之上述和其他目的、特徵、和優點能 易、酸特舉出一種側光式背光模組作為較佳實施例來加以 :明’然其並非用以限定本發明’在不脫離本發明之精神和 範圍内本發明的技術特徵也適用於其他形式的背光模兔。200807099 IX. Description of the Invention [Technical Field] The present invention relates to a backlight module, and more particularly to an anti-leakage side-lit backlight module. [Prior Art] A liquid crystal display device usually consists of a display panel and a backlight module. The main function of the backlight module is to provide sufficient brightness and a uniform distribution of light sources to enable the liquid crystal display to display images. In general, the backlight module can be divided into two types: a direct type (Direet-type) and an edge type (edge, pe), wherein the direct type design is to light 9 (for example, fluorescent (four) or light-emitting one body) It is disposed directly under the backlight module, and the design of the eye-catching bucket and the side-premise is to set the light source on the side of the backlight module. Referring to FIG. 1A, a cross-sectional structure diagram of a side-light backlight module of a known type is shown. The sidelight type backlight-I Λ 衩 衩 衩 1 〇 位于 位于 位于 位于 位于 位于 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , 〇, u / , a permanent film 50 and an optical film (not shown), the optical film may be placed above the V-light plate 40, wherein the light source reflects the lens cover 3 and has a clamping portion 3 0a 14 The bearing part 3 Ob, the light source 20 is disposed in the reflector 3〇, the plate end of the guide is sleeved on the light source reflector 30, and the board 4〇50 is disposed at the opening of the light source (not shown) The light of the reflection sheet placed on the bearing portion of the original reflection cover 30 can be directly or through the light source reflection ", the end surface 40a of the injection 4 射 is incident on the light guide plate 4 〇, the reflection, the self-light guide plate Inside, the light source exit surface (not labeled) of the light source exiting surface (not labeled) is destroyed by the dot set on the bottom surface of the light guide plate 40 to break the light, and the light plate line is directed toward the light guide plate 4 as much as possible. Xiao Zezhen let the first n yin source shot out, to use the filling tool of the light source. The ideal situation is that after the light enters the light guide plate, the light will be completely restricted by the total reflection after the total reflection is stopped. After the light is scattered by the mesh point (four), the first line is then emitted toward the exit surface of the light guide plate to Achieve the requirements of panel brightness and uniformity. 4. = The factor of 4 is made and assembled by the light guide plate 4, the angle of the light guide plate 40b and "0& can not be completely perpendicular to the boundary between the top and bottom surfaces, but the circle is rounded by 4〇b ^ ), ^ will Part of the light generated by the light source enters the light guide plate 4 through the angle 〇bb surface. When the portion of the light passes through the rounded corner _=plate 40, the angle of incidence is 'in the top surface of the light guide plate 4 ==critical angle, Therefore, there is no case of total reflection, that is, the light r 'light board 4 〇 causes light leakage, instead of scattering through the dot, such as the 1B picture m will also be,,. Outside, due to the problem of the design of the mechanism, the light. The bottom surface of the plate 4 and the mechanism gap 60 enter the light guide plate 40. This green color is also emitted by the light of the round & y, y, and A+ ¥ light plates without total reflection and the dot-moon ray. Solve the square plate and turn it into light leakage, as shown in Figure 1 c. At this stage, most of the t-blend is to increase the light-shielding area 12a to block the light leakage, but this way, the display installation is wide and & .nu The distance of the frontal area 70 is increased. Generally speaking, the plug is inserted through the 0 b face of the round moon, and the _ guide The light plate 40, the primary refracting light leakage can be illuminated by the light-shielding region 12a ^ m ^ the distance of the human refracting light is 2xtxtan (0c), t is the pre-degree of the light guide plate 40, 9C Λ道土』r 糸0 two light guide plates 4 〇 material The critical angle, assuming that the thickness of the light guide plate 40 is 8 mm, and the angle of the 陟旯 && I is 42 degrees, so the distance of the secondary refracting light leakage is 200807099 14.4 mm (as shown in Fig. 1C), for the display, The distance of such a margin area 70 is too large. Another way to solve the light leakage is as shown in Fig. 1D, the opening of the light source reflector 30 is made smaller than the thickness of the light guide plate 40, and then assembled. The light source reflector cover 30 is opened by the light guide plate 40, so that the gap between the light guide plate 4 and the upper and lower mechanisms of the light source reflector cover 30 is eliminated, so as to reduce the light leakage caused by the mechanism gap. However, since the light leakage of the round corner 40b cannot be solved, Therefore, it is still necessary to solve the phenomenon of light source unevenness caused by light leakage by means of the dot and the increase of the margin area 70. In addition, there is another way to solve the light leakage, as shown in Fig. 1E, the use of the added halo is higher. The diffusion sheet 8 is disposed on the light guide plate 40 Above, to spread the light leakage to the entire diffuser 8〇, but this will cause the brightness of the light source to drop, affecting the display quality of the display. [Invention] Therefore, there is a great need for an improved edge-lit backlight module to solve the problem. The problem of light leakage in the structure is known to achieve the purpose of effectively preventing light leakage. One aspect of the present invention is to provide a backlight module for preventing light leakage, by changing the size of the sidewall opening of the light source reflector, so that the light can substantially pass through the abutment The end face of the light source is incident on the light guide plate to prevent possible light leakage paths, thereby effectively solving the light leakage problem caused by the round corners and the mechanism gap. Without changing any other structural elements, all the possible light leakage paths can be almost closed by changing the design of the side wall opening of the light source reflector, and the light generated by the light source can be substantially partially injected through the end face. Into the light guide plate, thus achieving the purpose of preventing light leakage. According to a preferred embodiment of the present invention, the backlight module includes at least a light source, a reflector, and a light guide. The light source reflector has a first recess for receiving the light guide and a light source for receiving the light source. The second groove. The first groove has a bottom surface and a first opening. The second recess has a second opening disposed on a bottom surface of the first recess, and the second opening is smaller than a size of the bottom surface. The light guide plate has a light exit surface of the first plane 2 opposite to the first plane and an end surface, wherein the end faces are respectively connected by the first lead angle portion and the second lead angle portion to the first plane and the light reflecting surface. The end face has a size greater than or equal to the second opening, and the first lead angle portion and the second lead portion are located in the first recess such that the end surface covers the second opening. Another aspect of the present invention is to provide a display device having a backlight module with light leakage prevention. According to another preferred embodiment of the present invention, the display device includes at least: a display panel and the backlight module. Further in accordance with a preferred embodiment of the present invention, the material of the light source reflector can be, for example, metal or plastic. According to a preferred embodiment of the invention, the light source may be, for example, a light emitting diode (LED) or a cold cathode tube (CCFL). By applying the above-mentioned light-proof backlight module, the size of the opening of the side wall of the light source reflector is reduced, so that the light directly emitted by the light source or reflected by the side wall can be substantially completely injected through the end surface adjacent to the light source. In the light panel, it does not enter the light guide plate from the fillet (guide angle) or the mechanism gap. Therefore, the present invention can overcome the disadvantages of the prior art that it is impossible to prevent light leakage. Therefore, the present invention and the conventional structure of the present invention can effectively and substantially prevent light leakage. 200807099 [Embodiment] ▲ In order to make the above and other objects, features, and advantages of the present invention, an edge-lit backlight module is exemplified as a preferred embodiment: The present invention is also applicable to other forms of backlighting rabbits without departing from the spirit and scope of the invention.
請參閱第2A圖’係緣示本發明之一較佳實施例之防漏光 之側光式背光模組100的剖面結構示意圖。侧光式背光模 組100係位於液晶顯示面板110的下方，此侧光式背光模 組1〇0主要係包含有光源12〇、光源反射罩130、導光板140 以及反射片150,其中光源12〇之截面係呈具有一預定尺 寸之外圍輪廓’例如發光二極體，然不限於此，冷陰極管或 其他截面輪廓形狀之光源者也可以使用。 光源反射罩130至少包含：用來容置導光板14〇的第一 凹槽141以及用以容置該光源12〇的第二凹槽。第一凹槽 具有第一側壁MU、第二側壁141b以及底面141c，且藉由^ 一側壁和第二側壁141b可定義出第一開口 U9。第二凹 槽137具有第三側壁137a和第四側壁137b，藉由第三側壁 137a和第四側壁137b所定義的第二開口 138設置於第一凹槽 141底面141c，且第二開口 138小於底面。 了以理解的疋，第二開口 1 3 8係小於第一開口 1 3 9。其中 第二凹槽137係以非封閉方式環繞於光源12〇，並與光源 no之外圍輪廓相隔一預定距離，可將射向光源反射罩13〇 之光線加以反射，並以第二開口 i 3 8作為光源丨2 〇之光線的 出口。光源反射罩130之材質可以是金屬材質或塑膠材 9 200807099 質，例如在本發明的一些實施例之中，第三側壁η 四側壁137b本身係可由反射率高之金屬材質所製成，另= 選擇是第三側壁137a與第四側壁mb係由塑膝材質戶” 成’並在第三侧壁137a與第四侧壁mb上披覆反射層 例如金屬反射層，用以將光源、120所射出之光線反射至導光 板U0端面140a。❿光源反射$ 13〇彳以是以禱模或壓模 方式-體成形或分由二個以i的部件接合組立而成。Referring to FIG. 2A, a cross-sectional structural view of a light-proof backlight module 100 for light leakage prevention according to a preferred embodiment of the present invention is shown. The edge-lit backlight module 100 is located below the liquid crystal display panel 110. The edge-lit backlight module 100 主要 0 mainly includes a light source 12 , a light source reflector 130 , a light guide plate 140 , and a reflective sheet 150 . The cross-section of the crucible is a peripheral profile having a predetermined size, such as a light-emitting diode, but is not limited thereto, and a cold cathode tube or other light source of a cross-sectional profile shape can also be used. The light source reflector 130 includes at least a first recess 141 for receiving the light guide plate 14 and a second recess for receiving the light source 12〇. The first recess has a first sidewall MU, a second sidewall 141b, and a bottom surface 141c, and the first opening U9 can be defined by the sidewall and the second sidewall 141b. The second recess 137 has a third sidewall 137a and a fourth sidewall 137b. The second opening 138 defined by the third sidewall 137a and the fourth sidewall 137b is disposed on the bottom surface 141c of the first recess 141, and the second opening 138 is smaller than Bottom surface. In order to understand, the second opening 1 3 8 is smaller than the first opening 1 3 9 . The second recess 137 surrounds the light source 12A in a non-closed manner and is spaced apart from the peripheral contour of the light source no by a predetermined distance to reflect the light incident on the light source reflector 13 and to the second opening i 3 8 as the exit of the light source 丨2 〇. The material of the light source reflector 130 may be metal material or plastic material 9 200807099. For example, in some embodiments of the present invention, the third sidewall η four sidewalls 137b may be made of a metal material having a high reflectivity, and The third side wall 137a and the fourth side wall mb are selected from the plastic knee material and are covered with a reflective layer such as a metal reflective layer on the third side wall 137a and the fourth side wall mb for the light source and the 120 The emitted light is reflected to the end surface 140a of the light guide plate U0. The light source reflects $13 〇彳 to form a body by a prayer or a die-forming method or by two components joined by i.
導光板140具有第—平面14〇d、相對於第一平面之 光出射面140e以及一個端面14〇a，其中端面i4〇a分別藉由 第-導角部14〇b以及第二導角部i他與第一平面i樹和光 出射面MOe連接，端面14〇a之尺寸大於或等於第二開口 138 ’且第-導角部140b與第二導角部14〇c設置於位於第— 凹槽丨39内，並藉由第一侧壁14U與第二側壁14卜夾制並 固定導光板140，使端面14〇a遮蓋第二開口 138。在本發明 的較佳實施例之中，導光板140之端面MOa係與第一凹槽ΐ4ι 之底面141c接觸，並完全覆蓋於第二開口 138的邊緣，以阻 擋光源120之光線從導光板14〇之第一導角部14〇b與第二導 角部l4〇c射入至導光板14〇。 請參閱第2B圖，係繪示本發明之另一較佳實施例之防漏 光之側光式％光模組1 〇 〇的剖面結構示意圖。由於光源反 射罩130與導光板140在製造時不可避免的會有製造公差產 生，因此在將導光板140套裝於光源反射罩13〇的第一凹槽 139時’可能會有縫隙152介於第一凹槽之底面141c與導光 板140之端面140a之間，使端面i4〇a與底面底面〗41c無法 10 200807099 完全接觸密合，為了避免光線從此缝隙152中射出造成漏光， 所以在本貝％例中，可在底面丨4〗c非第二開口 i 3 8的部分上 設置吸收層172，例如黑色吸收層，用以將光源120所射出之 光線或第三側壁137a與第四側壁137b所反射之光線吸收。 另外反射片150設置於導光板14〇之第一平面14〇d和第 一凹槽141第二側壁141b之間，在本實施例中，第一側壁 141a與第二側壁141b之間的距離，係小於或等於導光板 力上反射片1 5 〇之厚度，用以夾制並固定導光板^ 和反射 片150。但是在另外一些實施例之中，光源反射罩係為金屬或 具有高反光性質塑膠的殼體，本身並不需要使用反射片15〇, 因此第一側壁141a與第二側壁141b之間的距離，只需小於 或等於導光板140之厚度，即可夾制並固定導光板14〇。其中 第側土 1 4 1 a與第二側壁1 41 b可分別與導光板的第一平面 140d和光出射面14〇e接觸。在本發明的又一些實施例之中， 可能包含至少一種光學膜片18〇設置於導光板140的第一平 面140d或光出射面14〇e之一侧，爲了固定光學膜片1⑼，第 、侧壁141a與第二側壁141b之間的距離，必需小於或等於 導光板140加上反射片15〇及光學膜片18〇之厚度，用以夾 制並固定導光板140和反射片150及光學膜片18〇。 以下列舉一實施例以及一比較例透過背光模組之軟體模 擬分析結果更詳盡闡述本發明之技術優勢，然下述之實施例 並非用以限定本發明，因此本發明之保護範圍當視後附之申 請專利範圍所界定者為準。 比較也 200807099 請參閱第3圖，係繪示習知之側光式背光模組2 0 0的剖 面結構示意圖。此侧光式背光模組2 0 0包含發光二極體 210、光源反射罩220以及導光板230，其中發光二極體21〇 的寬度T1約2.8mm，導光板230的厚度T2約8mm，導光 板230的圓角230a約0· 1mm，導光板230距離光源反射罩 220之機構間隙D1約0.3mm，光源反射罩220之開口寬度 D2約8.6mm，發光二極體210距離導光板23〇之光入射端 面23 0b的距離D3約’1.2mm。偵測面240設於導光板230 _之光出射面上方，高度D4約0.4mm的位置。以此習知结 構下’採用Breault Research Organization公司所出版的 ASAP 2005(advanced systems analysis program)軟體模 擬，在導光板無網點設計下，理論上因全反射關係，光線 會完全被限制在導光板内，當總光能量為920.40flux，债 測面240所吸收的光能量為17.27flllx，故約有1 876%的 漏光’以中央亮度300nit的19吋LCD為例，]L876%的漏 光如集中到3mm*3 86mm(有效顯示區域周圍）漏光面中，亮 度將達到854nit，這對人眼來說是相當亮而且明顯的。 例一 一 π翏閱第4圖，第4圖係繪示依據本發明之實施例一所 1 =之側光式背光模組3 00的剖面結構示意圖。在本發明 所提出 >之新結構下，在光源反射罩33〇具有用來容置導光板 的第一凹槽341以及用以容置該光源32〇的第二凹槽 337。第—凹槽具有第一側壁3仏、第二側壁3桃以及底面 M4c，且藉由第一側壁3化和第二側壁3心可定義出第一開 12 200807099 口 339。第二凹槽337具有第三側壁337a和第四側壁， 藉由第三側壁337a和第四側壁337b所定義的第二開口 338 a又置於第一凹槽341底面341c。其中第二凹槽337之第二側 壁337a和第四側壁337b之間具有大小約6 6mm的距離， 其係小於導光板330端面340a的厚度T3 (約8mm)，因此 第三側壁337a和第四側壁337b可實質地完全擋住光源32〇 之光線從導光板340之第一導角部340b與第二導角部34〇c 射入至導光板340。·在此結構下，光源32〇之總光能量為 參92〇.56flux，在導光板340的光出射34〇e面上方的偵測面24〇 所偵測到的光能量為2.635flux，故約有0.297%的漏光， 與S知結構相比已經減少8 4 %的漏光，會有漏光的原因是 第一凹槽341之底面341c與導光板340之端面340a之間仍 有縫隙352存在，其大小约0.05mm。因此若是在底面341c 非第二開口 338的部分上設置吸收層372,當可改善漏光情形。 實施例二 請參照第第5圖，第5圖係緣示依據本發明之實施例二 _ 所繪示之側光式背光模組4 0 0的剖面結構示意圖。其中第5 圖的結構大致與第4圖相似，僅在底面44 1 c非第二開口 438 的部分上設置吸收層472。在此結構下，總光能量為 920.1 fiux，>[貞測面240所吸收的光能量為1 · 1 64 flux，故約 有〇 · 1 2 7 %的漏光，比起習知結構已經減少9 3 %的漏光。 以中央亮度300nit的19吋LCD為例，0.127%的漏光集中 到3mm* 3 8 6mm漏光面中，亮度只達到33 6.8nit，與其他 區域的亮度只高出36.8nit，這對人眼來說是不明顯的。 13 200807099 綜上所述，本發明之防漏光的侧光式背光模魬，其結 特徵在於縮小環繞於光源外之光源反射罩的側壁開口， 並選擇性於㈣臨接導光板人光端面之—側，非^的位置 设置吸收層，使得光源所直接射出或經由側壁反射之光線， 能實質地完全經由入光端面射入至導光板中，而不會從端面 兩側的圓肖（亦即圓角部分）或機構間隙射入心光板。 因此’本發明可克服f知技術之無法防止漏光的缺點以 本發明與其它習知結構相比，本發明的側光式背光 效且實質地防止漏光。 …j百 由上述本發明較佳實施例可知，應用本發明之防 側光式背光模組，其優點在於不需要借助其他雯爽 防止漏光，僅藉由改變光源反射罩的形狀設計，使：線：士 也70王、π由端面部分射人導光板，不會從圓角或機構間 入至導光板’即可達到保護側光式背光模組免^受到漏光办 響的目的。所以與習知結構相比，本發明之側光式背光模： 之防漏光的效果較佳。 九挺組 雖然本發明已以數個較佳實施例揭露如上，然 以限定本發明，杯4 ^ ^ m 何热S此技藝者，在不脫離本發明 和範圍内’當可作各種之更動與潤飾，因此本 ；： 圍當視後附之中請專利範圍所界^者為準。 【圖式簡單說明】 第1 A圖係綠示-種習知之側光式背光模組的剖面結 冓示意圖。 ^ 第1B圖係繪示第丨八圖之習知側光式背光模組的一種 14 200807099 光線行進路線示意圖。 弟1 C圖传纟各一 诉、、會不繪示第1 A圖之習知侧光式背光模級 另一種光線行進路線示意圖。 笫1D圖传洛— 一 1糸、會不又一種習知之側光式背光模組的剖面 結構不意圖。 弟 1E圖你終一 从技-立 ”、、、日不再一種習知之側光式背光模組的剖面 結構不意圖。 弟2 A圖^(系έ备-丄心 二、北1 Μ 1不本兔明之一較佳實施例之防漏光之側光 式月^光模組的剖面結構示意圖。 Μ。 圖係繪示本發明之另一較佳實施例之防漏光之側 光式为^模乡且的剖面結構示意圖。 圖； 第I圖係1會示習知之侧光式背光模 組的剖面結構示意 光模發明之實施例 弟5圖係|會示依擔 去握έ 务明之貝施例二所％示之側光式背 先权組彻的剖面結構示意圖。 不之側先式 【主要元件符號說明 1 〇 ·側光式背光模矣且 12a:遮光區域 3 0 :光源反射罩 3〇b :承載部 1 2 :液晶顯示面板 20 :光源 3〇a :爽制部 4〇:導光板 15 200807099 40a :端面 40b :圓角（導角） 5 0 :反射片 70 :緣額區 80 :擴散片 100 :侧光式背光模組 11 0 :液晶顯示面板 1 2 0 :光源 130 :光源反射罩 13 7:第二凹槽 137a ：第三側壁 137b ：第四側壁 138 :第二開口 139 :第一開口 140 :導光板、 140a ：端面 140b :第一導角部 140c :第二導角部 140d ··第一平面 140e :光出射面 141 :第一凹槽 1 4 1 a :第一側壁 1 4 1 b :第二側壁 141c ：底面 1 5 0 :反射片 1 5 2 :缝隙 170 :反射層 172 :吸收層 1 8 0 :光學膜片 200 ··側光式背光模組 2 1 〇 :發光二極體 220 :光源反射罩 230 :導光板 230b ：光入射端面 240 :偵測面 300 :側光式背光模組 320 :光源 3 3 0 :光源反射罩 3 3 7 :第二凹槽 337a ：第三側壁 3 3 7b :第四側壁 3 3 8 ·•第二開口 3 39 :第一開口 340 :導光板 3 4 0 a ·端面 340b :第一導角部 340c :第二導角部 340d :第一平面 16 200807099 340e :光出射面 3 4 1 a :第一側壁 341c :底面 3 72 :吸收層 420 :光源 437 :第二凹槽 437b ：第四側壁 439 :第一開口 440a ·端面 440c :第二導角部 440e :光出射面 441a :第一側壁 44 1 c :底面 472 ··吸收層 3 4 1 ··第一凹槽 3 4 1 b :第二側壁 3 5 2 :缝隙 400 :側光式背光模組 43 0 ：光源反射罩 437a :第三側壁 438 :第二開口 440 ··導光板 440b :第一導角部 440d :第一平面 441 :第一凹槽 441b ：第二側壁 452 :缝隙 D1 :機構間隙 D2 :光源反射罩（第一凹槽）之開口寬度 D 3 :發光二極體距離導光板之光入射端面的距離 _ D4 ··偵測面設於導光板之光出射面上方的高度 D5 :第三側壁和第四側壁間的距離 T 1 :發光二極體的寬度 T2 :導光板的厚度 T3 :端面的厚度 17The light guide plate 140 has a first plane 14〇d, a light exit surface 140e with respect to the first plane, and an end surface 14〇a, wherein the end surface i4〇a is respectively passed through the first lead angle portion 14〇b and the second lead portion i is connected to the first plane i tree and the light exit surface MOe, the size of the end surface 14〇a is greater than or equal to the second opening 138 ′ and the first lead angle portion 140 b and the second lead angle portion 14 〇 c are disposed at the first recess In the slot 39, the light guide plate 140 is sandwiched and fixed by the first side wall 14U and the second side wall 14, so that the end surface 14A covers the second opening 138. In the preferred embodiment of the present invention, the end face MOa of the light guide plate 140 is in contact with the bottom surface 141c of the first recess ΐ4ι and completely covers the edge of the second opening 138 to block the light of the light source 120 from the light guide plate 14. The first lead angle portion 14A and the second lead portion 14b are injected into the light guide plate 14A. Please refer to FIG. 2B, which is a cross-sectional structural diagram of the side leakage type optical module 1 〇 防 of the leakage preventing light according to another preferred embodiment of the present invention. Since the light source reflector 130 and the light guide plate 140 are inevitably manufactured at the time of manufacture, when the light guide plate 140 is set in the first groove 139 of the light source reflector 13 ', there may be a gap 152 between the first Between the bottom surface 141c of a groove and the end surface 140a of the light guide plate 140, the end surface i4〇a and the bottom surface bottom surface 41c cannot be completely in close contact with each other, and in order to prevent light from being emitted from the slit 152, leakage occurs. In an example, an absorbing layer 172, such as a black absorbing layer, may be disposed on a portion of the bottom surface 〗 〗 c non-second opening i 3 8 for illuminating the light source 120 or the third sidewall 137a and the fourth sidewall 137b. The reflected light is absorbed. In addition, the reflective sheet 150 is disposed between the first plane 14〇d of the light guide plate 14〇 and the second sidewall 141b of the first recess 141. In this embodiment, the distance between the first sidewall 141a and the second sidewall 141b, It is less than or equal to the thickness of the reflective sheet 15 5 导 of the light guide plate for clamping and fixing the light guide plate and the reflection sheet 150. However, in other embodiments, the light source reflector is a metal or a housing having a high reflective plastic, and does not need to use the reflective sheet 15〇 itself, so the distance between the first sidewall 141a and the second sidewall 141b, The light guide plate 14 can be clamped and fixed only by being less than or equal to the thickness of the light guide plate 140. The first side soil 1 4 1 a and the second side wall 1 41 b are respectively in contact with the first plane 140d and the light exit surface 14〇e of the light guide plate. In some embodiments of the present invention, at least one optical film 18 is disposed on one side of the first plane 140d or the light exit surface 14〇 of the light guide plate 140. To fix the optical film 1 (9), The distance between the sidewall 141a and the second sidewall 141b must be less than or equal to the thickness of the light guide plate 140 plus the reflective sheet 15 and the optical film 18A for clamping and fixing the light guide plate 140 and the reflective sheet 150 and the optical The diaphragm is 18 inches. The following is a detailed description of the technical advantages of the present invention by a software simulation analysis result of a backlight module, and the following embodiments are not intended to limit the present invention. Therefore, the scope of protection of the present invention is attached. The scope of the patent application is subject to change. Comparing 200807099 Please refer to FIG. 3, which is a cross-sectional structural view showing a conventional edge-lit backlight module 200. The edge-lit backlight module 200 includes a light-emitting diode 210, a light source reflector 220, and a light guide plate 230. The width T1 of the light-emitting diode 21〇 is about 2.8 mm, and the thickness T2 of the light guide plate 230 is about 8 mm. The rounded corner 230a of the light plate 230 is about 0.1 mm, the light guide plate 230 is about 0.3 mm from the mechanism gap D1 of the light source reflector 220, the opening width D2 of the light source reflector 220 is about 8.6 mm, and the light emitting diode 210 is separated from the light guide plate 23 The distance D3 of the light incident end face 23 0b is approximately '1.2 mm. The detecting surface 240 is disposed above the light exit surface of the light guide plate 230_, and has a height D4 of about 0.4 mm. Under the conventional structure, using the ASAP 2005 (advanced systems analysis program) software simulation published by Breault Research Organization, under the no-dot design of the light guide plate, the light is completely confined in the light guide plate due to the total reflection relationship. When the total light energy is 920.40flux, the light energy absorbed by the debt measurement surface 240 is 17.27flllx, so about 1 876% of the light leakage is taken as an example of a 19 吋 LCD with a central brightness of 300 nit.] L876% of the light leakage is concentrated. In the light leakage surface of 3mm*3 86mm (around the effective display area), the brightness will reach 854nit, which is quite bright and obvious to the human eye. For example, FIG. 4 is a cross-sectional structural view showing the side light type backlight module 300 of the embodiment 1 according to the embodiment of the present invention. In the new structure proposed by the present invention, the light source reflector 33 has a first recess 341 for accommodating the light guide plate and a second recess 337 for accommodating the light source 32A. The first groove has a first side wall 3, a second side wall 3, and a bottom surface M4c, and the first opening 12 200807099 port 339 can be defined by the first side wall 3 and the second side wall 3. The second recess 337 has a third side wall 337a and a fourth side wall, and the second opening 338a defined by the third side wall 337a and the fourth side wall 337b is again placed on the bottom surface 341c of the first recess 341. The second side wall 337a and the fourth side wall 337b of the second recess 337 have a distance of about 66 mm, which is smaller than the thickness T3 (about 8 mm) of the end surface 340a of the light guide plate 330, and thus the third side wall 337a and the fourth side. The side wall 337b can substantially completely block the light from the light source 32 from the first lead portion 340b and the second lead portion 34〇c of the light guide plate 340 to the light guide plate 340. In this configuration, the total light energy of the light source 32 is 〇92〇.56flux, and the light energy detected by the detecting surface 24〇 above the light exiting surface 34〇 of the light guide plate 340 is 2.635flux, so Approximately 0.297% of the light leakage has been reduced by 84% compared with the S-known structure. The reason for the light leakage is that there is still a gap 352 between the bottom surface 341c of the first recess 341 and the end surface 340a of the light guide plate 340. Its size is about 0.05mm. Therefore, if the absorbing layer 372 is provided on the portion of the bottom surface 341c which is not the second opening 338, the light leakage can be improved. Embodiment 2 Referring to FIG. 5, FIG. 5 is a schematic cross-sectional view showing the edge-lit backlight module 400 according to the second embodiment of the present invention. The structure of Fig. 5 is substantially similar to that of Fig. 4, and the absorbing layer 472 is provided only on the portion of the bottom surface 44 1 c which is not the second opening 438. Under this structure, the total light energy is 920.1 fiux, > [the light energy absorbed by the speculative surface 240 is 1 · 1 64 flux, so there is about 1 1 2 7 % of light leakage, which has been reduced compared to the conventional structure. 9 3 % of light leakage. Taking a 19 吋 LCD with a central brightness of 300 nit as an example, 0.127% of the light leakage is concentrated in the 3 mm* 3 8 6 mm light leakage surface, the brightness is only 33 6.8 nit, and the brightness of other areas is only 36.8 nit, which is for the human eye. It is not obvious. 13 200807099 In summary, the anti-light leakage side-lit backlight module of the present invention is characterized in that the side wall opening of the light source reflection cover surrounding the light source is reduced, and is selectively connected to the human light end surface of the light guide plate. - the side, the position of the non-^ is provided with an absorbing layer, so that the light directly emitted by the light source or reflected through the side wall can be substantially completely incident into the light guide plate through the light incident end face, without being rounded from both sides of the end face (also That is, the rounded portion) or the interstitial space is injected into the glazing panel. Therefore, the present invention can overcome the disadvantages of the inability to prevent light leakage by the prior art. In contrast to the conventional structure of the present invention, the edge-lit backlight of the present invention effectively and substantially prevents light leakage. It can be seen from the above preferred embodiment of the present invention that the anti-sidelight type backlight module of the present invention has the advantage that it does not need to be protected by other light to prevent light leakage, and only by changing the shape design of the light source reflector, Line: Shi also 70 king, π from the end face part of the light guide plate, will not enter the light guide plate from the rounded corners or between the mechanisms to achieve the purpose of protecting the side-light backlight module from the leakage of light. Therefore, compared with the conventional structure, the edge-light type backlight module of the present invention has a better effect of preventing light leakage. Although the present invention has been disclosed in several preferred embodiments as above, in order to limit the present invention, the present invention can be modified in various ways without departing from the scope of the invention. And retouching, therefore this;: Belong to the scope of the patent, the scope of the patent is subject to the standard. [Simple description of the drawing] Fig. 1A is a schematic diagram showing the cross-section of the side-lit backlight module of the green display type. ^ Figure 1B is a schematic diagram of a light-traveling route of a conventional light-emitting backlight module of the eighth drawing. The brothers 1 C picture will tell each other, and will not show the conventional side-lit backlight mode of Figure 1 A. Another diagram of the light travel route.笫 1D image transmission Luo - 1 糸, will not be a conventional side-lit backlight module cross-sectional structure is not intended. Brother 1E, you will never know the profile structure of a side-light backlight module that is no longer known as a technology--,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, A cross-sectional structural diagram of a light-proof side-lighting optical module of a preferred embodiment of the present invention is not shown in the drawings. The figure shows a side light-proof type of light leakage prevention according to another preferred embodiment of the present invention. Schematic diagram of the cross-sectional structure of the model. Figure 1 shows the cross-sectional structure of the conventional side-lit backlight module. The embodiment of the optical model invention is shown in the figure 5 of the invention. Schematic diagram of the cross-sectional structure of the side-light type of the first-precision group shown in the second example of the example. No side first-form [main component symbol description 1 〇·side-light backlight module and 12a: shading area 3 0 : light source reflector 3〇b: carrier portion 1 2: liquid crystal display panel 20: light source 3〇a: cool portion 4: light guide plate 15 200807099 40a: end face 40b: rounded corner (guide angle) 5 0 : reflection sheet 70: margin area 80: diffuser 100: edge-lit backlight module 11 0: liquid crystal display panel 1 2 0 : light source 130: light source reflector 13 7: second groove 137a The third side wall 137b: the fourth side wall 138: the second opening 139: the first opening 140: the light guide plate, 140a: the end surface 140b: the first guide portion 140c: the second guide portion 140d · the first plane 140e: light Exit surface 141: first groove 1 4 1 a : first side wall 1 4 1 b : second side wall 141c : bottom surface 1 50 : reflective sheet 1 5 2 : slit 170: reflective layer 172: absorption layer 1 8 0 : Optical film 200 · · Side light type backlight module 2 1 〇: Light-emitting diode 220: Light source reflector 230: Light guide plate 230b: Light incident end face 240: Detection surface 300: Side-light backlight module 320: Light source 3 3 0 : light source reflector 3 3 7 : second groove 337a : third side wall 3 3 7b : fourth side wall 3 3 8 · second opening 3 39 : first opening 340 : light guide plate 3 4 0 a · End face 340b: first lead angle portion 340c: second lead angle portion 340d: first plane 16 200807099 340e: light exit face 3 4 1 a : first side wall 341c: bottom face 3 72: absorbing layer 420: light source 437: second The groove 437b: the fourth side wall 439: the first opening 440a, the end surface 440c: the second corner portion 440e: the light exit surface 441a: the first side wall 44 1 c: the bottom surface 472 ··absorbing layer 3 4 1 ··first groove 3 4 1 b : second side wall 3 5 2 : slit 400 : edge-light type backlight module 43 0 : light source reflecting cover 437a : third side wall 438 : second Opening 440 · · Light guide plate 440b: first guide portion 440d: first plane 441: first groove 441b: second side wall 452: slit D1: mechanism gap D2: opening width of the light source reflector (first groove) D 3 : distance of the light-emitting diode from the light incident end surface of the light guide plate _ D4 · · the detection surface is disposed at a height D5 above the light exit surface of the light guide plate: a distance between the third side wall and the fourth side wall T 1 : light emission The width T2 of the diode: the thickness T3 of the light guide plate: the thickness of the end face 17