200538807 玖、發明說明： 【發明所屬之技術領域】 本發明提供一種導光板（light guide plate)，尤指一種具有 貫穿設置之反射面的高光利用率導光板。 【先前技術】 背光模組是液晶顯示器等平面顯示裝置產品的關鍵零組件之 一’目前已普遍應用於數位相機、行動電話、數位個人助理（PDA) 以及平面電視等相關產品上。一般而言，背光模組大多是設置於 顯示面板的背面，包含·有光源、導光板、擴散板（diffusi〇n sheet) 以及數種光學膜片或稜鏡片（prism sheet)。其中，導光板係用來 將光源產生器產生之光源散射（scatter)至顯示面板，擴散板用來 將光源均勻分散，而光學膜片或稜鏡片置於擴散板上方，用來提 高背光模組的亮度與均勻性。 請參考圖一，圖一為習知一側光式（edge light type)背光模 組10結構之剖面示意圖。如圖一所示，背光模組10係設於一顯 示面板12的下方，包含有至少一光源14、一導光板16、一擴散 板18設於導光板16與顯示面板丨2之間、一稜鏡片20設於擴散 板18上方，以及一反射板（refiecfing sheet) 22設於導光板16 下方並固定於一外殼（housing) 24中。光源14的外圍通常另設有 一反射罩（reflecting housing) 26，用來反射光源14所產生之 光線’以使大部分光源14所產生的光線都射入導光板16中，進 而提供光線至顯示面板12。導光板16用來將光源14產生之光線 散射至擴散板18。一般而言，導光板16的底面16b會以印刷方式 形成複數個網點16c，以增加光線的擴散效果。此外，導光板16 的側面一般也會塗佈一反射層（未顯示），其作用和反射板22相 10 200538807 同，用來將導光板16中行進的光線反射回導光板16中，以增加 光的使用率，進而提供一較佳之亮度輸出。擴散板18則將通過的 光線進一步散射，以提供顯示面板12更均勻分散之光線。稜鏡片 20的主要作用在於增加背光模組1〇所產生的亮度，其原理與導光 板16的聚光效果相似，並使顯示面板12接收到的光線能有一較 均勻的照光強度分布，稜鏡片20所設置的數量及順序可視需求加 以變化。設於反射板22下方並包覆反射板22周圍的外殼2/，^ 用來固定擴散板18、導光板16、反射板22以及光源14。 、 由於在一般側光式背光模組1〇中，僅有一組或兩組光源14設 於導光板16之側邊，因此光線僅能從導光板16之侧邊射入導^ 板16中，藉由在導光板16中折射，使光線散射於整個導光板u 中，以提供顯示面板12光源。在此情況下，光線是否能在導光板 16中有均勻的散射，以及導光板16是否能有效利用光源14所產 生的光線，實為影響顯示面板12的顯示品質的關鍵因素之一。 如圖一所示，當光源14所產生之光線入射角太小時（如圖一中 所示之光線L1)，光線會在導光板16中來回折射而損耗能量，且 入射角較小的光線在經過多次折射而經由出光面16a離開導光板 W時，可能會因為折射角太大而缺乏利用性。故習知改良方法必 須在V光板16上方设置擴散版18、棱鏡片2〇或其他光學元件， 才能有效利用折射角較大的光線。另—方面，為了收集從光源14 射入V光板16中入射角較大的光線（如圖一中所示之光線l2)，導 光板16也必須具有較大的厚度，以確保其在導光板16中有較佳 折射路徑，進而提高光利用率。因此，在習知背光模組1〇中，為 I確保顯示面板12有較佳的光源，導光板16的必須具有一定的 ^度，而影響背光模組1〇的輕薄化研發限制。同時，即使在背光 =組10中使用較厚的導光板16，仍然無法避免部分光線在離開導 先板16時的角度太大，導致光利用率降低，及應用困難的問題。 11 200538807 【發明内容】 因此本發明之主要目的在於提供—種高光利用率以 解決上述習知導光板的問題。 v先才 根據本發明之中請專利範圍，係揭 二板=以貫穿的方式設於透光板-，可反射行 由於本發明之導光板内設置有 射而直接朝出光面行進，並以較小的入射角射反:二 線離開導光板的折射角度也較小， ΪΪ光Ϊ3 ; 且具有高利用性的光源，進而可以縮 广„度、，去習知技術中背光模組之棱鏡片或擴散片等元 件，以達到使背光模組輕.薄化的需求。 、 【實施方式】 視干明音圖考㈣以及圖。，圖二為本發明導光板之第一實施例的上 如固； 為圖二所示導光板沿切線2-2,的剖視示意圖。 5Λ—及i’/光板5Q包含有—透光板體52,其具有—出光面 Hi 58 °透光板體52包含有複數個孔洞54，以貫 ί界的於透光板體52之内，而每—孔洞54與透光板體52 至少一反射面6〇,用以全反射或部分反射行進 ^中之光線。如圖三所示，孔洞54a、54b表面為反 於、土南6〇b，而在圖二所示之第一實施例中，距離入光面58 又退处之孔洞54的分佈係比距離入光面58較近之孔洞54的分 12 200538807 佈較為密集，在此分佈下，距離入光面58較近處之反射面60的 總面積較小，因此大部分的光仍可直接在透光板體52中行進，傳 遞散射至整個透光板體52中。 在本貫施例中，導光板5 0另包含有反射膜6 2，設於透光板體 52之出光面56以外的表面上，用來將行進於透光板體52中之光 線反射回透光板體52中，使得光線僅能從出光面56離開透光板 體52,以提高光利用率。反射膜62可藉由在透光板體52表面塗 佈反射材料而達到反射光線之目的。由於反射膜62亦塗佈於入光 面、58表面，故反射膜62可選用半反射材料，使光線仍然可以從 入光面58進入透光板體52中。再者，反射膜62亦可選用不透鲁 光反射材料，設於透光板體52之出光面56以及入光面58以外 的表面上。200538807 (1) Description of the invention: [Technical field to which the invention belongs] The present invention provides a light guide plate, particularly a light guide plate with a high light utilization ratio having a reflective surface disposed therethrough. [Previous technology] Backlight modules are one of the key components of flat-panel display devices such as liquid crystal displays. They are currently widely used in digital cameras, mobile phones, digital personal assistants (PDAs), and flat-screen televisions. Generally speaking, most backlight modules are provided on the back of a display panel, and include a light source, a light guide plate, a diffuser sheet, and several types of optical films or prism sheets. Among them, the light guide plate is used to scatter the light source generated by the light source generator to the display panel, the diffuser plate is used to evenly disperse the light source, and the optical film or cymbal is placed above the diffuser plate to improve the backlight module Brightness and uniformity. Please refer to FIG. 1. FIG. 1 is a schematic cross-sectional view showing a structure of a conventional edge light type backlight module 10. As shown in FIG. 1, the backlight module 10 is disposed below a display panel 12 and includes at least one light source 14, a light guide plate 16, and a diffusion plate 18 disposed between the light guide plate 16 and the display panel 2. The cymbal 20 is disposed above the diffuser plate 18, and a reflective sheet 22 is disposed below the light guide plate 16 and fixed in a housing 24. A reflecting housing 26 is usually provided on the periphery of the light source 14 to reflect the light generated by the light source 14 so that most of the light generated by the light source 14 enters the light guide plate 16 to provide light to the display panel. 12. The light guide plate 16 is used to diffuse the light generated by the light source 14 to the diffusion plate 18. Generally speaking, a plurality of halftone dots 16c are formed on the bottom surface 16b of the light guide plate 16 by printing to increase the light diffusion effect. In addition, a reflective layer (not shown) is generally coated on the side of the light guide plate 16 and has the same function as the reflective plate 22 10 200538807. It is used to reflect the light traveling in the light guide plate 16 back to the light guide plate 16 to increase The light usage rate provides a better brightness output. The diffuser plate 18 further scatters the passing light, so as to provide the display panel 12 with more evenly dispersed light. The main function of the cymbal 20 is to increase the brightness generated by the backlight module 10. Its principle is similar to the light-concentrating effect of the light guide plate 16, and enables the light received by the display panel 12 to have a more uniform light intensity distribution. The number and order of the settings can be changed as required. The casing 2 / which is disposed below the reflection plate 22 and covers the periphery of the reflection plate 22 is used to fix the diffusion plate 18, the light guide plate 16, the reflection plate 22 and the light source 14. Since only one or two sets of light sources 14 are provided on the side of the light guide plate 16 in the general edge-lit backlight module 10, light can only enter the light guide plate 16 from the side of the light guide plate 16, By refracting in the light guide plate 16, light is scattered throughout the light guide plate u to provide a light source for the display panel 12. In this case, whether the light can be uniformly scattered in the light guide plate 16 and whether the light guide plate 16 can effectively utilize the light generated by the light source 14 are really one of the key factors affecting the display quality of the display panel 12. As shown in FIG. 1, when the incident angle of the light generated by the light source 14 is too small (such as the light L1 shown in FIG. 1), the light will be refracted back and forth in the light guide plate 16 to lose energy, and the light with a smaller incident angle is When the light guide plate W leaves the light guide plate W through the light emitting surface 16a after being refracted multiple times, the refraction angle may be too large, which may result in lack of usability. Therefore, in the conventional improvement method, a diffusion plate 18, a prism sheet 20, or other optical elements must be provided above the V light plate 16 in order to effectively use the light with a large refraction angle. On the other hand, in order to collect light having a larger incident angle from the light source 14 into the V light plate 16 (such as the light 12 shown in FIG. 1), the light guide plate 16 must also have a large thickness to ensure that it is in the light guide plate. There is a better refraction path in 16 to further improve light utilization. Therefore, in the conventional backlight module 10, in order to ensure a better light source for the display panel 12, the light guide plate 16 must have a certain degree, which affects the thin and light R & D restrictions of the backlight module 10. At the same time, even if a thicker light guide plate 16 is used in the backlight = group 10, the angle of some light when leaving the guide plate 16 is still too large, resulting in lower light utilization and difficult application. 11 200538807 [Summary of the Invention] Therefore, the main object of the present invention is to provide a high light utilization ratio to solve the above-mentioned problem of the conventional light guide plate. v According to the scope of the patent application of the present invention, the second board = is provided on the light-transmitting plate in a penetrating manner, and the reflective line travels directly to the light-emitting surface due to the radiation provided in the light guide plate of the present invention. Small incident angle reflection: the angle of refraction of the second line leaving the light guide plate is also small, ΪΪ 光 Ϊ3; and a light source with high availability, which can further reduce the degree and the prism of the backlight module in the conventional technology Elements such as sheet or diffuser sheet to meet the requirements of making the backlight module lighter and thinner. [Embodiment Mode] Figures and diagrams of dry sound diagrams. Figure 2 is the first embodiment of the light guide plate of the present invention. It is a schematic cross-sectional view of the light guide plate along the tangent line 2-2 shown in Figure 2. 5Λ—and i ′ / 光 板 5Q includes a light-transmitting plate 52 having a light-emitting surface Hi 58 ° light-transmitting plate 52 Containing a plurality of holes 54 to pass through the boundary within the light-transmitting plate body 52, and each hole 54 and the light-transmitting plate body 52 have at least one reflective surface 60 for total or partial reflection. Light. As shown in Figure 3, the surfaces of holes 54a, 54b are reverse, and Tunan 60b. In an embodiment, the distribution of the holes 54 that are receding from the light-receiving surface 58 is denser than the points of the holes 54 that are closer to the light-receiving surface 58. 200538807 In this distribution, the holes 54 are closer to the light-receiving surface 58. The total area of the reflecting surface 60 is relatively small, so most of the light can still travel directly in the light-transmitting plate body 52 and transmit and diffuse to the entire light-transmitting plate body 52. In this embodiment, the light guide plate 50 It also includes a reflective film 62, which is provided on a surface other than the light emitting surface 56 of the transparent plate body 52, and is used to reflect the light traveling in the transparent plate body 52 back to the transparent plate body 52, so that the light can only The light-transmitting plate body 52 is separated from the light-emitting surface 56 to improve the light utilization rate. The reflective film 62 can achieve the purpose of reflecting light by coating a reflective material on the surface of the light-transmitting plate body 52. Since the reflective film 62 is also coated on the The light surface and the 58 surface, so the reflective film 62 can use a semi-reflective material, so that light can still enter the light-transmitting plate body 52 from the light-entering surface 58. In addition, the reflective film 62 can also be made of an opaque light-reflective material. On surfaces other than the light-emitting surface 56 and the light-incident surface 58 of the transparent plate body 52.
、由於—般導光板所使用的透光板體材料折射係數以之範圍約 為1.4〜1.5,因此本發明導光板50係利用在透光板體52中設 ^具有特殊角度的孔洞54以形成反射面6Q，再藉由透光板體折 $係數np與空氣折射率nA的不同，使得部分行進於透光板體Μ 中之光線在接觸到反射面60時，發生全反射，而改變原來行進方 向並以較小入射角從出光面5 6射入空氣中。 晴參相四，圖四a圖三射導光板之部分放w意圖。反 面广與出光面56具有一夾角θ’在本實施例中夾角㊀較⑹ 如圖四所示，透光板體52中的光線L1行進至透光板體f 底叫’會經由反賴62反射而行進至反射面6〇。當光^ 角大於全反射角時’光線以會直接被反射面6〇a反身" =光面56。由於空氣的折射率〜為工，大於透光板體52 ίΡ，導致光線的出光角度，即折射肖〜會大於人射角〜 口此，藉由調整反射面60a與出光面56的夾角θ，例如使夾角 13 200538807 ，銳角，便可使大部分光線在離開透光板體56 =控制在-30〜3。度之間，以大幅提高光利用性。=斤：角 Μ光線射至反射面60時之入射角小於全反射角時： 績折射行進。請參考圖五，圖五為圖三所示導 姑a ▲ 意二光Μ2行進至反射面6°4，由於入射角太=不: :二面60a反射’而會繼續射出經過孔洞W，再射入透光： 立因此，根據本發明，當光線從入光面58進入透光板體52中， 部分光線會被反射面60a、60b反射至不同方向，而部分光線 會在接觸反射面後㈣繼續前進，傳遞至透光板體52的各個位 .置。同時，為使光線能擴散至.整個透光板體52中，因此各孔洞 54^及反射面60a、6此之設置參數包含有形狀、大小、角度、 疏密度以及位置等，便可依據產品之需求而有各種不同之設言 例如使兩相鄰之孔洞54錯位設置，隨著距離入光面58遠近而有 不同疏密度、反射角度、反射面大小等等。 請參考圖六與圖七，圖六為本發明導光板之第二實施例的上視 示意圖，圖七則為圖六所示導光板沿切線6一6，的剖視示意圖。如 圖六所示，導光板100包含有透光板體1〇2，以及複數個反射面 l〇8a、l〇8b、110a、110b。透光板體1〇2具有一出光面1〇4 及一入光面106a。透光板體102另包含有複數個孔洞12〇、凹 槽I·22及凹六I2 6,反射面10 8a、l〇8b係設於貫穿透光板體ι〇2 之長條形孔洞120表面，而反射面ii〇a、i10b則分別設於凹槽 122以及凹穴126表面。由圖六以及圖七可知，距離入光面i〇6a 較遠之凹穴126、凹槽122或孔洞120之反射面的表面積較大， 而較距離入光面106a較近之凹穴126、凹槽122或孔洞120的 反射表面積較小’因此’距離入光面1 〇 6 a較遠之反射面1 〇 8 a、 108b的面積大於距離入光面i〇6a較近之反射面的面積，例如反 14 200538807 射面110a及ll〇b 〇 由於設於透光板體102中的各反射面l〇8a、i〇8b、ll〇a、π Ob 可全反射行進於透光板體102中的光線，因此藉由調整各反射面 108a、108b、110a、ll〇b的角度，使其與出光面之間具有不 同大小的夾角’可以使被反射的光線以較小角度離開導光板 100。在本實施例中，凹穴126、凹槽122以及孔洞120表面另塗 佈有反射層128，以提高反射面108a、l〇8b、ll〇a、ll〇b的反射 效果。 再者’本實施例中之導光板100為平板形板體，其侧邊塗佈有 反射膜116，可將光線反射回導光板1〇〇中。導光板另可包含 有複數個網點112，設於透光板體1 〇2相對於出光面1 之表面 上，以反射及散射等方式使光線在透光板體1〇2中擴散，進而提 高導光板的輝度，並使光線分佈更加均勻。此外，導光板1〇〇另 可包含有一反射片114，設於透光板體1〇2及網點112之底部，用 來將光線反射回透光板體102，以提高光利用率。Since the refractive index of the light-transmitting plate material used by the general light-guiding plate ranges from about 1.4 to 1.5, the light-guiding plate 50 of the present invention uses holes 54 having special angles in the light-transmitting plate 52 to form The reflecting surface 6Q, and the difference between the refractive index np of the light-transmitting plate body and the refractive index nA of the air, make part of the light traveling in the light-transmitting plate body M completely reflect when it touches the reflective surface 60, and changes the original It travels into the air from the light-emitting surface 56 at a small incident angle. Participation in the sunny phase 4, Fig. 4a and Fig. 3 are part of the light guide plate. The opposite surface and the light-emitting surface 56 have an included angle θ ′. In this embodiment, the included angle ㊀ is relatively large. As shown in FIG. 4, the light ray L1 in the light-transmitting plate 52 travels to the light-transmitting plate f. Reflected and traveled to the reflecting surface 60. When the light angle is greater than the total reflection angle, the light rays will be directly reflected by the reflecting surface 60a " = light surface 56. Since the refractive index of air is larger than the light-transmitting plate 52, it leads to the angle of light exit, that is, the angle of refraction ~ will be larger than the angle of incidence of people ~ By adjusting the angle θ between the reflecting surface 60a and the light-emitting surface 56, For example, by making the angle 13 200538807 and the acute angle, most of the light can leave the transparent plate 56 = controlled to -30 ~ 3. To greatly improve light availability. = Jin: Angle When the incident angle of the ray of ray hitting the reflecting surface 60 is smaller than the total reflection angle: the refracted travel. Please refer to Figure 5. Figure 5 shows the guide a shown in Figure 3. ▲ The second light M2 travels to the reflective surface 6 ° 4. Because the incident angle is too high = no:: 60a reflected on the second surface, it will continue to exit through the hole W, and then Impinging into the light: Therefore, according to the present invention, when light enters the light-transmitting plate 52 from the light incident surface 58, part of the light will be reflected by the reflecting surfaces 60 a and 60 b to different directions, and part of the light will contact the reflecting surface. ㈣ Continue to move forward to the various positions of the transparent plate body 52. At the same time, in order to diffuse the light into the entire transparent plate 52, the parameters of the holes 54 ^ and the reflecting surfaces 60a, 6 include shape, size, angle, density and position, etc., which can be based on the product. There are various different requirements such as displacing two adjacent holes 54 in different positions, and different sparse densities, reflection angles, reflection surface sizes, etc. with distance from the light incident surface 58. Please refer to FIG. 6 and FIG. 7. FIG. 6 is a schematic top view of the second embodiment of the light guide plate according to the present invention. FIG. 7 is a schematic cross-sectional view of the light guide plate shown in FIG. As shown in FIG. 6, the light guide plate 100 includes a light-transmitting plate body 102 and a plurality of reflective surfaces 108a, 108b, 110a, and 110b. The transparent plate body 102 has a light emitting surface 104 and a light incident surface 106a. The light-transmitting plate body 102 further includes a plurality of holes 120, grooves I · 22 and concave six I2 6, reflecting surfaces 10 8a, 108b which are arranged in the elongated holes 120 penetrating the light-transmitting plate ι〇2. Surface, and the reflecting surfaces ii〇a and i10b are respectively provided on the surface of the groove 122 and the cavity 126. It can be seen from FIG. 6 and FIG. 7 that the surface area of the reflecting surface 126, the recess 122, or the hole 120 that is farther from the light incident surface i06a is larger, and the cavity 126 that is closer to the light incident surface 106a, The reflecting surface area of the groove 122 or the hole 120 is small, so the area of the reflecting surface 1 0a that is far from the light incident surface 1 0a, 108b is larger than the area of the reflecting surface that is closer to the light incident surface 106a. For example, the anti-14 200538807 transmission surfaces 110a and 110b. Because the reflection surfaces 108a, 108, 110a, and π Ob provided in the light-transmitting plate 102 can travel in total reflection on the light-transmitting plate 102 Therefore, by adjusting the angles of the reflecting surfaces 108a, 108b, 110a, and 110b, the angle between the reflecting surfaces 108a, 108b, 110a, and 110b can be different from that of the light emitting surface, so that the reflected light leaves the light guide plate 100 at a small angle. . In this embodiment, the surface of the cavity 126, the groove 122, and the hole 120 is further coated with a reflective layer 128 to improve the reflection effect of the reflective surfaces 108a, 108b, 110a, and 110b. Furthermore, the light guide plate 100 in this embodiment is a flat plate-shaped body, and a reflective film 116 is coated on the side thereof to reflect light back into the light guide plate 100. The light guide plate may further include a plurality of dots 112 provided on the surface of the light-transmitting plate body 102 relative to the light-emitting surface 1. The light is diffused in the light-transmitting plate body 102 by reflection and scattering, thereby improving The brightness of the light guide plate and makes the light distribution more uniform. In addition, the light guide plate 100 may further include a reflective sheet 114 provided at the bottom of the light-transmitting plate body 102 and the dot 112 to reflect light back to the light-transmitting plate body 102 to improve light utilization.
“請參考圖八，圖八為本發明導光板之第三實施例應用於一背光 模組中的剖面示意圖。如圖八所示，背光模組15〇設於一液晶顯 不面板152之背部’包含有—光源154、—反射罩166、一本發 明導光板156以及-外殼164，而本發明導光板156係設於外殼 164内側所形成之谷室中。本實施例之導光板為一模形透光 板表面具有複數個未貫穿導光板156之凹穴174以及複數 貝牙底面178和出光面158的孔洞172,由於導光;^反156材質 的折射係數nP和空氣不同，因此設置於導光板156中之凹穴174 以及孔’同172的表面會形成反射面168、i7Q 的光線經由人光面16G進人透純體156時，行進至反射面 170、168的光線會因為人射角度的不同，分別被反射面n 15 200538807 1 6 8反射或折射，繼續以不同角度散射至整個導光板1 5 6 ’而部 分被反射面17 0、168反射的光線，則會以較佳角度從出光面158 離開導光板15 6。 由於孔洞172以及凹穴174的設置會影響導光板156内的光線 的行進方向，因此其分布密度及面積大小便可依其在導光板156 中不同的位置調整。由圖八可知，距離入光面160較近的凹穴174 的深度較淺，使得距離入光面16〇較近的反射面168面積較小， 避免影響大部分光線在導光板156的行進方向，使光線可以行進 至離入光面160較遠處而均勻分佈至整面導光板156中；距離入 光面160較遠的反射面no則具有較大面積，例如貫穿導光板156 的孔洞172設置在距離入光面160較遠處，以有效反射光線，提 高光利用性。 在本實施例中，導光板156另包含有複數個反射片162a、 162b，分別設於導光板156的底面184以及側面表面，以確保光 線只能從出光面158離開導光板156，同時，導光板156的底面 178另以網版印刷方式製作有複數個網點176，用來使光線在導光 板156中有較佳分佈。由於在導光板156中設置反射面168、170 可以使光線以較小角度從出光面158離開導光板156,因此導光板 156所提供的光源具有較佳輝度，且光利用性也較習知技術大為提 高，而導光板156與液晶顯示面板152之間亦可不需另外設置擴 散板或棱鏡片等元件，以同時降低背光模組150的成本以及厚度， 達到使液晶顯示器輕薄化的需求。然而，背光模組150仍可以依 實際設計需要，在本發明導光板156上方設置擴散板或稜鏡片， 以滿足不同顯示器的需求。 相較於習知技術，本發明導光板係利用導光板材質和空氣之折 射係數的不同，在導光板内設置複數個孔洞、凹槽或凹穴，形成 16 200538807 可以改變光線行進方向或角度的反射面，攔截在導光板中反覆折 射的光線，使得離開導光板的光線可以被集中利用，提高光利用 性。本發明導光板不限於楔形或平板形狀，因此可以適用於直下 式或側光式背光模組，而在側光式背光模組中，光源亦可設置於 導光板的複數個側邊附近，使光線從不同方向進入導光板中。本 發明導光板中孔洞及反射面的分佈密度、面積、深度、角度或表 面處理可依不同背光模組以及顯示器的需求而設計，其製作方式 可以精密加工方式在導光板上打孔或刻晝出凹槽，亦可以射出成 形方式同時製作出具有孔洞的導光板，因此製程簡易，卻可大幅 提高光利用性，並進一步取代擴散板、稜鏡片及網點，降低成本 及背光模組的厚度。 【圖式簡單說明】 圖式之簡單說明 圖一為習知一側光式背光模組結構之剖面示意圖。 圖二為本發明導光板之第一實施例的上視示意圖。 圖三為圖二所示導光板沿切線2-2 '的剖視示意圖。 圖四為圖二所不導光板之部分放大不意圖。 圖五為圖二所不導光板之部分放大不意圖。 圖六為本發明導光板之第二實施例的上視示意圖。 圖七為圖六所示導光板沿切線6-6 '的剖視示意圖。 圖八為本發明導光板之第三實施例應用於一背光模組中的剖面示 意圖。 圖式之符號說明 10、150 背光模組 12、152 顯示面板 17 200538807 14、154 光源 16、50、100、156 16a、56、104、158 16b、178 底面 16c、112、176 網點 導光板 出光面 18 擴散板 20 稜鏡片 22 反射板 24 ^ 164 外殼 26 ' 166 反射罩 52 - 102 透光板體 54、54a、54b、120、172 58、106a、160 60、60a、60b、108a、108b 反射面 62、11.6 反射膜 106b 側面 114、162a、162b 122 凹槽 126 - 174 凹穴 128 反射層 孔洞 入光面 、110a、110b、168、170“Please refer to FIG. 8, which is a schematic cross-sectional view of a third embodiment of a light guide plate of the present invention applied to a backlight module. As shown in FIG. 8, the backlight module 15 is disposed on the back of a liquid crystal display panel 152 It includes a light source 154, a reflecting cover 166, a light guide plate 156 of the present invention, and a housing 164, and the light guide plate 156 of the present invention is disposed in a valley chamber formed inside the housing 164. The light guide plate of this embodiment is a The shape of the light-transmitting plate has a plurality of cavities 174 that do not penetrate the light guide plate 156 and a plurality of holes 172 of the bottom surface 178 and the light exit surface 158 of the shell. Due to the light guide; the refractive index nP of the anti-156 material is different from the air, so it is set The surface of the recess 174 and the hole 172 in the light guide plate 156 will form a reflective surface 168, i7Q. When the light from the human light surface 16G enters the pure body 156, the light traveling to the reflective surface 170, 168 will be caused by people. The different angles of reflection are reflected or refracted by the reflecting surface n 15 200538807 1 6 8 respectively, and continue to be scattered at different angles to the entire light guide plate 1 5 6 ′, while some of the light reflected by the reflecting surfaces 17 0, 168 are better. Angle from light exit surface 158 away from light guide 15 6. Since the arrangement of the holes 172 and the recesses 174 will affect the direction of light travel in the light guide plate 156, its distribution density and area can be adjusted according to its different positions in the light guide plate 156. As can be seen from Figure 8, The depth of the recess 174, which is closer to the light incident surface 160, is shallower, so that the area of the reflecting surface 168, which is closer to the light incident surface 160, is smaller, so as to avoid affecting most of the light traveling direction on the light guide plate 156, so that the light can travel. It is evenly distributed to the entire light guide plate 156 to a distance from the light entrance surface 160; the reflective surface no farther from the light entrance surface 160 has a larger area, for example, the hole 172 penetrating the light guide plate 156 is set at a distance from the light entrance The surface 160 is relatively far away to effectively reflect light and improve light utilization. In this embodiment, the light guide plate 156 further includes a plurality of reflection sheets 162a and 162b, which are respectively disposed on the bottom surface 184 and the side surface of the light guide plate 156 to It is ensured that the light can only leave the light guide plate 156 from the light emitting surface 158, and at the same time, the bottom surface 178 of the light guide plate 156 is additionally screen-printed with a plurality of dots 176, so that the light has a better distribution in the light guide plate 156. Reflective surfaces 168 and 170 are provided in the light guide plate 156 so that light can leave the light guide plate 156 from the light exit surface 158 at a small angle. Therefore, the light source provided by the light guide plate 156 has better brightness and light availability than conventional techniques. It is greatly improved, and it is not necessary to provide additional elements such as a diffusion plate or a prism sheet between the light guide plate 156 and the liquid crystal display panel 152, so as to reduce the cost and thickness of the backlight module 150 at the same time, so as to meet the demand for thin and light liquid crystal displays. However The backlight module 150 may still be provided with a diffusion plate or a cymbal above the light guide plate 156 of the present invention according to actual design requirements, so as to meet the requirements of different displays. Compared with the conventional technology, the light guide plate of the present invention utilizes the difference between the material of the light guide plate and the refractive index of the air. A plurality of holes, grooves or recesses are provided in the light guide plate to form 16 200538807 which can change the direction or angle of light travel. The reflecting surface intercepts the light repeatedly refracted in the light guide plate, so that the light leaving the light guide plate can be used in a concentrated manner, and the light availability is improved. The light guide plate of the present invention is not limited to a wedge shape or a flat plate shape, so it can be applied to a direct type or an edge light type backlight module. In the edge light type backlight module, the light source can also be arranged near a plurality of sides of the light guide plate, so that Light enters the light guide plate from different directions. The distribution density, area, depth, angle, or surface treatment of the holes and reflective surfaces in the light guide plate of the present invention can be designed according to the requirements of different backlight modules and displays. The manufacturing method can be punched or carved on the light guide plate by precision processing. Out of the groove, the light guide plate with holes can also be produced at the same time by injection molding. Therefore, the manufacturing process is simple, but it can greatly improve the light utilization, and further replace the diffuser plate, the cymbal, and the dot, reducing the cost and the thickness of the backlight module. [Brief description of the drawings] Brief description of the drawings FIG. 1 is a schematic cross-sectional view of the structure of a conventional side light backlight module. FIG. 2 is a schematic top view of a light guide plate according to a first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the light guide plate shown in FIG. 2 along a tangent line 2-2 ′. FIG. 4 is an enlarged view of a part of the light guide plate in FIG. 2. FIG. 5 is an enlarged view of a part of the light guide plate shown in FIG. 2. FIG. 6 is a schematic top view of a light guide plate according to a second embodiment of the present invention. FIG. 7 is a schematic cross-sectional view of the light guide plate shown in FIG. 6 along a tangent line 6-6 '. FIG. 8 is a schematic cross-sectional view of a third embodiment of a light guide plate of the present invention applied to a backlight module. Symbols of the drawings 10, 150 Backlight module 12, 152 Display panel 17 200538807 14, 154 Light source 16, 50, 100, 156 16a, 56, 104, 158 16b, 178 Bottom surface 16c, 112, 176 Dot light guide plate light emitting surface 18 Diffuse plate 20 Cymbal 22 Reflective plate 24 ^ 164 Housing 26 '166 Reflective cover 52-102 Transparent plate body 54, 54a, 54b, 120, 172 58, 106a, 160 60, 60a, 60b, 108a, 108b Reflective surface 62, 11.6 Reflective film 106b Side 114, 162a, 162b 122 Grooves 126-174 Cavities 128 Reflective layer holes into the light surface, 110a, 110b, 168, 170
反射片A reflective sheet
1818