1360689 六、發明說明 【發明所屬之技術領域】 [0001 ] 本發明係關於一種應用於液晶顯示領域之導光板及背光 模組，尤指一種側光式導光板及背光模組。 【先前技術】 [0002] 導光板（Light Guide Plate，LGP)主要包括光入射面 、反射面、出射面及幾個側面，係液晶顯示背光模組系 統中之重要組成部分。其作用係引導分散點光源（例如發 光二極體）或線光源（例如冷陰極管）發出之光從一個平面 出射’同時提高面板發光輝度及發光亮度之均勻性。導 光板一般採用合成樹脂材料製成，其基板形狀分爲平板 型及楔型曲面型。 [0003] 進入導光板之光線將根據全發射原理在板内傳播，當光 線遇到導光板表面之微結構（pattern)時’全發射條件 被破壞，光線自導光板正面射出，疏密、大小不同之微 結構設計，可以使導光板均句發光。導光板微結構製造 技術可以分成兩大類：印刷式及非印刷式。前者利用網 印方式將油墨印在導光板上，製作微結構形狀及分伟。 後者則直接以射出成型技術，將微結構設計在模具内， 在製成上較爲簡化，而且精密度高，係目前導光板技術 主流。非印刷式製作方法又分爲：化學⑽法、錯射直 寫法及精密機械加工法等。 [0004] 隨著液晶顯示器（Liquid Crystal DispUy，咖）在 諸如手機、車載顯示器、個人數位助理（per_ai1360689 VI. Description of the Invention [Technical Field] The present invention relates to a light guide plate and a backlight module used in the field of liquid crystal display, and more particularly to a side light type light guide plate and a backlight module. [Prior Art] [0002] The Light Guide Plate (LGP) mainly includes a light incident surface, a reflective surface, an exit surface, and several side surfaces, and is an important component in a liquid crystal display backlight module system. Its function is to guide the light emitted by a scattered point source (such as a light-emitting diode) or a line source (such as a cold cathode tube) to exit from a plane while improving the uniformity of the panel luminance and luminance. The light guide plate is generally made of a synthetic resin material, and the shape of the substrate is divided into a flat plate type and a wedge type curved surface type. [0003] The light entering the light guide plate will propagate in the plate according to the principle of full emission. When the light encounters the pattern of the surface of the light guide plate, the full emission condition is destroyed, and the light is emitted from the front surface of the light guide plate, and is dense and small. Different microstructures can make the light guide plate emit light uniformly. Light guide plate microstructure manufacturing technology can be divided into two categories: printed and non-printed. The former uses the screen printing method to print the ink on the light guide plate to make the microstructure shape and fractal. The latter is directly in the injection molding technology, the microstructure is designed in the mold, the production is simplified, and the precision is high, which is the mainstream of the current light guide plate technology. Non-printing methods are further divided into: chemical (10) method, misdirected direct writing method and precision machining method. [0004] With liquid crystal displays (Liquid Crystal DispUy, coffee) in such as mobile phones, car displays, personal digital assistants (per_ai)
Assistant’ PDA)以及電視機等應用領域之拓展 093127585 表單編號A0101 第4頁/共26頁 ' 1003281617*0 1360689 100:年.08·月04日修正替换頁 ，對以導光板爲主之背光技術提出了更高要求，主要表 _ ； » » ' 現在：高亮度、低成本、！能耗、輕薄化等。 ’ [0005] 如第一圖所示，目前習知背光模組1 0，包括光源11、導 光板13與反射板12、擴散片14以及增亮片15等光學膜片 。其中反射片12係將未被散射之光線再導入導光板13中 ，擴散片14使光線形成漫射而均勻擴散，消除導光板上 微結構形成之亮區，增亮片15起到會聚光線，提高亮度 之作用。 [0006] 然而，從光束之出射角度看，上述之導光板之設計不考 慮角度控制，因此從導光板出射面出射之光束將背離光 源而並不垂直於出射面。這樣的光束經過擴散片及增亮 片等光學膜之作用後，才會以垂直於出射面之方向射向 LCD，達到實際使用要求。 [0007] 又如第二圖所示，2000年10月10日公告之第6, 130, 930 號美國專利揭示一種反射面具有V型微結構之導光板20， 該V型微結構之表面設計成鏡面，從而可以去除反射片。 [0008] 惟，該背光裝置之導光板沒有角度控制功能，所以還是 要外加增亮片、擴散片等光學膜片，以使最終出射光能 夠垂直射出。 [0009] 有鑑於此，提供一種不需加設光學膜片而能使出射光垂 直出射面射出之導光板及應用該種導光板之背光模組實 為必要。 【發明内容】 [0010] 本發明所要解決之第一技術問題係：提供一種導光板， 093127585 表單編號A0101 第5頁/共26頁 1003281617-0 1360689 m [0011] [0012] [0013] [0014] [0015] 可以不需加設先學 、月而能使出射光垂直出射面射出 本發明所要解決欠 V、 一 ，其具有上述導光二技術問題係：提供一種^光^組 現使出射光垂直^ ’從而可以不需加設光學膜片而實 出射之功能。 爲解決上述第— 一種導光板，包=問題，本發明提供之技術方案係： 之反射面。其中，Ρ入射面、一出射面及一設有增反膜 凸出且角度一欵反射面形成有若干朝該導光板外部 反射面所在平面^型微結構，其頂角爲40-95度，其與 以及15-50度。&形成之第一及第二底角分別爲70_90度 使用睹 射面進入該導光杈至少部分由光源發出之光線經入 垂直於出射面之+内，經該反射面之乂型微結構反射後沿 方向出射。 爲解決上述第二枝術 一種背光模組，包問題，本發明提供之技術方案係： 板包括-人射^括〜側光源及—導光板，其中該導光 其中，該反射面形〜出射面及一設有增反膜之反射面， 一致之v型微結樽成有若干朝該導光板外部凸出且角度 平面所形成之第〜其項角爲40-95度，其與反射面所在 度。使用時，至，丨、，第二底角分別爲70-90度以及15_5〇 入該導光板内，Α 分由側光源發出之光線經入射面進 出射面之方向出射面之V型微結構反射後沿垂直於 所述V型微結構可 雖该入射面之方向由疏至密排布。 所述V型微結構可沿㈣該人射面^心㈣㈣布。 其中V型微結構之尺寸可按以下公式排布： ^ JOV 08月C4日；.接正吞換頁 093127585 表單编號Α0101 第6頁/共26頁 1003281617-0 1360689 ：1 100年.08月04日修正_頁 [0016] y = 0. 0001x2 + 0. 0005x + 0. 0023 ； 、 、 、 ~· [0017] 其中，χ係V型微結構之位置座標，y係V型|結篇寬度值 ，隨X增加而增加。 [0018] 所述V型微結構之寬度範圍不超過200微米。其中，最佳 寬度範圍爲10-112微米。 [0019] 所述V型微結構爲棱柱型，沿入射面之一侧向其相對之另 一側延伸，且各個V型微結構相互平行排列。其中，在各 V型微結構中，其任一頂點距離該反射面所在平面之高度 一致。 [0020] 所述導光板進一步包括其他設有增反膜之侧面。 [0021] 所述導光板可爲平板或楔型板。 [0022] 相對於習知技術，本發明控制V型微結構之角度以及具有 高反射特性之反射面，可以方便之將導光板之出射光控 制在垂直出射面之方向上，最大限度之利用了光能。該 種導光板及由其組成之背光模組在功能上提高了亮度， 在結構上去除了傳統背光膜組之反射片、擴散片及增亮 片等光學膜，簡化了系統，提高了性能。 [0023] 同時本發明通過調節V型微結構之分佈及密度可以控制出 射光亮度之均勻性，使得在垂直及平行於光源光束傳播 之兩個方向上之均勻性在82%以上，而且這兩個方向之 光束出射角半寬小於30度，可見大部分光束沿垂直於導 光板之出射面方向射出。 【實施方式】 093127585 表單編號A0101 第7頁/共26頁 1003281617-0 1360689 [0024]Extension of Assistant' PDA) and TV applications 093127585 Form No. A0101 Page 4 of 26 '1003281617*0 1360689 100: Year.08·Month 04 revised replacement page, backlight technology based on light guide Put forward higher requirements, the main table _ ; » » ' Now: high brightness, low cost,! Energy consumption, thinning and so on. As shown in the first figure, the conventional backlight module 10 includes an optical film such as a light source 11, a light guide plate 13 and a reflection plate 12, a diffusion sheet 14, and a brightness enhancement sheet 15. The reflection sheet 12 re-introduces the unscattered light into the light guide plate 13. The diffusion sheet 14 diffuses the light and uniformly diffuses, eliminating the bright region formed by the microstructure on the light guide plate, and the brightness enhancement sheet 15 converges the light and improves The role of brightness. [0006] However, from the perspective of the exit of the light beam, the design of the light guide plate described above does not take into account the angle control, so that the light beam emerging from the exit surface of the light guide plate will be away from the light source and not perpendicular to the exit surface. After passing through the optical film such as the diffusion sheet and the brightness enhancement sheet, such a light beam is directed toward the LCD in a direction perpendicular to the exit surface to meet practical use requirements. [0007] As shown in the second figure, U.S. Patent No. 6,130,930, issued toK. It is mirrored so that the reflection sheet can be removed. [0008] However, the light guide plate of the backlight device has no angle control function, so an optical film such as a brightness enhancement sheet or a diffusion sheet is additionally applied so that the final emitted light can be emitted vertically. In view of the above, it is necessary to provide a light guide plate capable of emitting a vertical exit surface without emitting an optical film, and a backlight module using the same. SUMMARY OF THE INVENTION [0010] A first technical problem to be solved by the present invention is to provide a light guide plate, 093127585 Form No. A0101, Page 5 of 26, 1003281617-0, 1360689 m [0011] [0012] [0014] [0014] [0015] The present invention can be solved without the need to add a prior learning, and the moon can be emitted. The present invention has the above-mentioned problem of illuminating the light, and has the technical problem of providing the above-mentioned light guide. Vertical ^ ' so that it can be launched without the need to add an optical film. In order to solve the above-mentioned first light guide plate, the package is a problem, and the technical solution provided by the present invention is: a reflective surface. Wherein, the Ρ incident surface, an exit surface and an anti-reflection film are protruded and the angle-reflecting surface is formed with a plurality of planar microstructures facing the outer reflecting surface of the light guide plate, and the apex angle is 40-95 degrees. It is also with 15-50 degrees. The first and second base angles formed are 70_90 degrees respectively, and the light guide surface is used to enter the light guide. At least part of the light emitted by the light source passes through the + perpendicular to the exit surface, and the dome-shaped microstructure passing through the reflective surface After the reflection, it is emitted in the direction. In order to solve the above-mentioned second method, a backlight module and a package problem, the technical solution provided by the present invention is as follows: the board includes a human lens, a side light source, and a light guide plate, wherein the light guide body has the reflection surface shape The surface and a reflecting surface provided with the anti-reflection film, the uniform v-shaped micro-junction is formed with a plurality of convexities protruding toward the outside of the light guide plate and the angle formed by the angle plane is 40-95 degrees, and the reflecting surface Degree. When in use, the second base angle is 70-90 degrees and 15_5 respectively into the light guide plate, and the V-shaped microstructure of the light emitted by the side light source passing through the entrance surface of the incident surface and the exit surface is formed. The rear edge of the reflection is perpendicular to the V-shaped microstructure, and the direction of the incident surface is arranged to be densely arranged. The V-shaped microstructure can be along (4) the person's face ^4 (four) (four) cloth. The size of the V-shaped microstructure can be arranged according to the following formula: ^ JOV August C4;. Connected to the page 093127585 Form number Α 0101 Page 6 / Total 26 pages 1003281617-0 1360689 : 1 100 years. August 04 Day Correction_Page [0016] y = 0. 0001x2 + 0. 0005x + 0. 0023 ; , , , ~ · [0017] where, the position coordinates of the χ-type V-type microstructure, y-type V-type | , increases as X increases. [0018] The width of the V-shaped microstructure does not exceed 200 microns. Among them, the optimum width ranges from 10 to 112 microns. [0019] The V-shaped microstructure is prismatic, extending along one side of the incident surface to the opposite side thereof, and the respective V-shaped microstructures are arranged in parallel with each other. Among them, in each of the V-shaped microstructures, any one of the vertices is equal to the height of the plane of the reflecting surface. [0020] The light guide plate further includes other sides provided with an anti-reflection film. [0021] The light guide plate may be a flat plate or a wedge plate. [0022] Compared with the prior art, the present invention controls the angle of the V-shaped microstructure and the reflective surface with high reflection characteristics, and can conveniently control the light emitted from the light guide plate in the direction of the vertical exit surface, thereby maximizing the utilization. Light energy. The light guide plate and the backlight module composed thereof are functionally improved in brightness, and the optical film such as the reflection sheet, the diffusion sheet and the brightness enhancement sheet of the conventional backlight film group are removed in the structure, thereby simplifying the system and improving the performance. [0023] At the same time, the present invention can control the uniformity of the emitted light brightness by adjusting the distribution and density of the V-shaped microstructure, so that the uniformity in the two directions of vertical and parallel light source propagation is above 82%, and both The beam exit angle of one direction is less than 30 degrees, and most of the light beam is emitted in a direction perpendicular to the exit surface of the light guide plate. [Embodiment] 093127585 Form No. A0101 Page 7 of 26 1003281617-0 1360689 [0024]
下面將結合附圖對本發明作進一步之詳細說明。 100年08月04日修正替換頁<The invention will be further described in detail below with reference to the accompanying drawings. Corrected replacement page on August 4, 100 <
[0025] 請>併參閱第三至五圖：，本明所提供之一種平板型. 光板30，包括一入射面31、一出射面33、一與該出射面 33相對之反射面32以及其他三個側面（未標示）。其中.， 入射面31形成於導光板30臨近光源40之側面。出射面33 形成於該導光板30之頂面。反射面32形成於導光板30之 底面，其設有增反膜36。 [0026] 重要的是，該反射面32還形成有若干V型微結構320，其 沿背離該出射面31之方向向導光板30之外部凸起》V型微 結構320之頂角0 1在40-95度之間，其與反射面32所在 平面所形成之第一及第二底角0 2、0 3分別爲70-90度以 及15-50度。 [0027] 使用時，光源40發出之部分光線經入射面31進入該導光 板30内，到達反射面32之V型微結構320並產生反射，沿 垂直於出射面33之方向由出射面33射出。 [0028] 在本實施例中，V型微結構320之頂角θ 1係65度，較大的 第一底角0 2係85度，較小的第二底角03係30度。 [0029] 另，爲提高出射光之均勻性，該複數V型微結構320之尺 寸沿背離該入射面31之方向係由小到大排布之。即其靠 近光源處之V型微結構320較小，遠離光源處之V型微結構 320較大。需注意的是，該V型微結構320尺寸之遞增方式 一般呈非線性規律，並將根據導光板材料特性及出射光 亮度均勻性之要求而需具體設計。其遞增方式可通過以 下公式表示： 093127585 表單编號Α0101 第8頁/共26頁 1003281617-0 1360689 100‘08月04日核正 [0030] y = 0. 0001χ2 + 〇. 〇〇〇5χ + 〇. 〇〇23; [0031]其中’ X係V型微結構320與入射面31之間之平均距離，y 係320微結構宽度值，隨x增加而增加。 [0032]應指出的是，各V型微結構320之最小寬度L最好在1〇微米 ’但可以根據加工工藝水平，小於1〇微米。其最大寬度L 可在200微米，以使得人眼不容易通過lcd看出導光板30 上之V5i微結構320，從而可以去除會造成很大能量損失 之擴散片》本實施例之V型微結構32〇之寬度l最小爲1〇微 米，最大爲112微米。 [0033] 同時’該複數V型微結構320係沿背離入射面31之方向由 疏至密排布之。即其排列密度距離光源40越近越稀疏， 每相鄰兩V型微結構32〇間距較大；距離光源40越遠越密 集，每相鄰兩V型微結構320間距較小。 [0034] 在實際使用過程中，如果導光板30有局部透光亮度偏高 之現象’可以縮小V型微結構之大小以及降低V型微結構 之排列密度；反之，如果局部透光亮度偏低，可以增大V 型微結構之大小及增加V型微結構之排列密度。 [0035] 另’爲便於進行精密機械加工，本實施例之V型微結構 320設計爲棱柱型，沿入射面31之一侧延伸至其相對之另 一側’連續無斷裂《在各V型微結構320中，其任一頂點 距離該反射面所在平面之高度一致。同時，各個V型微結 構320相互平行排列。 [0036] 導光板一般由合成樹脂材料製成，本實施例之導光板30 之材料爲聚曱基丙烯酸甲酯β增反膜36係一金屬或者介 093127585 表單編號 Α0101 第 9 頁/共 26 頁 1003281617-0 1360689 [0037] [0038] [0039] [0040] [0041] 100年Ό8月04每巧正替換 質鍍膜，如鋁膜。反射面32包括凸出之V型微結構320’通‘ t，.過鍍膜等工藝具有高之反射率。爲提高能量利用率，除 · 入射面31外之三個側面，也應該具有高之反射率，可以 通過鍍增反膜36來實現。 光源40可爲點光源，例如發光二極體，也可爲線光源， 例如冷陰極管。該光源40裝在一U型燈罩41之中，該II型 燈罩41之開口正對該導光板30之入射面31，用以防止光 線泄漏並使光線盡數通過該入射面31進入導光板30内。 請一併參閱第六圖及第七圖，其反映出射光束之角度分 佈情況。可以看出兩個方向之角度半寬都在30度以内， 大部分光束沿垂直於導光板30之出射面33方向射出。 請一併參閱第八圖及第九圖，其顯示亮度隨位置之變化 情況，並反映出導光板30出射亮度之均勻性情況。其中 第八圖顯示出第六圖中之歸一化亮度隨距離光源遠近之 變化情況，第九圖爲第七圖中之歸一化亮度隨位置（沿 垂直於光束傳播方向）之變化情況。從中可以看出導光 板30之亮度在如上兩個方向保持在82%以上之均勻性。 請參閱第十圖，上述V型微結構320之設計同樣可應用於 楔型導光板中。在該實施例中，本發明提供之楔型導光 板90，包括一入射面91、一出射面93、一反射面92以及 其他三個側面。其中，入射面91形成於導光板90臨近光 源80之側面。出射面93形成於該導光板90之頂面。反射 面92形成於導光板90之底面，其設有增反膜（未標示）。 類似地，該反射面92還形成有若干V型微結構920，向導 093127585 表單編號A0101 第10頁/共26頁 1003281617-0 1360689 1:00年.08月04日.修正_頁 光板90之外部凸起。V型微結構920之了員角以及其與反射 面9-2.所在平面所形成之第一及第二底角之範圍均與前一 實施例中之相同。 [0042] 使用時，光源80發出之部分光線經入射面91進入該導光 板90内，到達反射面92之V型微結構920並産生反射，沿 垂直於出射面93之方向由出射面93射出。 • · . . - · ·; [0043] 值得注意的是，主要由側光源與導光板30或90所組成之 背光模組，在結構上去除了傳統背光膜組之反射片、擴 散片及增亮片等光學膜，並可以將出射光控制在垂直出 射面之方向上，從而實現傳統背光膜組之功能，同樣屬 於本發明所要求保護之主題。 [0044] 本發明控制V型微結構之角度以及具有高反射特性之反射 面，可以方便之將導光板之出射光控制在垂直出射面之 方向上，最大限度之利用了光能。這樣之導光板在功能 上提高了亮度，在結構上去除了傳統背光膜組之反射片 、擴散片及增亮片等光學膜，簡化了系統，提高了性能 〇 [0045] 同時本發明通過調節V型微結構之分佈及密度可以控制出 射光亮度之均勻性，使得在垂直及平行於光源光束傳播 之兩個方向上之均勻性在82%以上，而且這兩個方向之 光束出射角半寬小於30度，可見大部分光束沿垂直於導 光板之出射面方向射出。 [0046] 综上所述，本發明確已符合發明專利要件，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例， 093127585 表單編號Α0101 第11頁/共26頁 1003281617-0 1360689 G j年·ϋ8月Ό4·日.孩正替接;頁 舉凡熟悉本案技藝之人士，於援依本案發明精神所作之μ 等效修飾或變化，皆應包含於以下之申請專利範圍内。* 【亂式簡單說明】 [0047] 第一圖係習知背光模組之結構示意圖。 [0048] 第二圖係習知技術之第6, 1 30, 730號美國專利所揭示之 導光板之截面示意圖。 [0049] 第三圖係本發明提供之平板型導光板之立體示意圖。 [0050] 第四圖係沿第三圖局部IV之放大圖。 [0051] 第五圖係本發明提供之平板型導光板之光路示意圖。 [0052] 第六圖係本發明之平板型導光板沿平行於光源光束傳播 方向（水平方向）之歸一化光亮度與角度之關係曲線。 [0053] 第七圖係本發明之平板型導光板沿垂直於光源光束傳播 方向（垂直方向）之歸一化光亮度與角度之關係曲線。 [0054] 第八圖係第六圖中歸一化亮度隨距離光源遠近（沿光束 傳播方向）之位置變化之關係曲線。 [0055] 第九圖係第七圖中歸一化亮度隨位置（沿垂直於光束傳 播方向）變化之關係曲線。 [0056] 第十圖係本發明提供之楔型導光板之立體示意圖。 【主要元件符號說明】 [0057] 導光板：30,90 [0058] 入射面：31，91 [0059] 反射面：32, 92 093127585 表單编號A0101 第12頁/共26頁 1003281617-0 1360689. 100年.08月04'日接正_頁 [0060] V型微結構：320, 920 [0061] 出射面：3 3，9 3 [0062] 增反膜：36 [0063] 光源：40, 80 [0064] 燈罩：41 1003281617-0 093127585 表單編號A0101 第13頁/共26頁[0025] Please refer to the third to fifth figures: a flat type optical plate 30 provided by the present invention includes an incident surface 31, an exit surface 33, a reflecting surface 32 opposite to the exit surface 33, and The other three sides (not shown). The incident surface 31 is formed on a side of the light guide plate 30 adjacent to the light source 40. The exit surface 33 is formed on the top surface of the light guide plate 30. The reflecting surface 32 is formed on the bottom surface of the light guide plate 30, and is provided with an anti-reflection film 36. [0026] It is important that the reflective surface 32 is further formed with a plurality of V-shaped microstructures 320 that protrude toward the outer surface of the light guide plate 30 in a direction away from the exit surface 31. The apex angle 0 of the V-type microstructure 320 is 40. Between -95 degrees, the first and second base angles 0 2, 0 3 formed by the plane of the reflecting surface 32 are 70-90 degrees and 15-50 degrees, respectively. [0027] In use, part of the light emitted by the light source 40 enters the light guide plate 30 through the incident surface 31, reaches the V-shaped microstructure 320 of the reflective surface 32 and generates reflection, and is emitted from the exit surface 33 in a direction perpendicular to the exit surface 33. . In the present embodiment, the apex angle θ 1 of the V-shaped microstructure 320 is 65 degrees, the larger first base angle 0 2 is 85 degrees, and the smaller second base angle 03 is 30 degrees. [0029] In addition, in order to improve the uniformity of the emitted light, the size of the plurality of V-type microstructures 320 is arranged from small to large in a direction away from the incident surface 31. That is, the V-shaped microstructure 320 near the light source is smaller, and the V-shaped microstructure 320 far from the light source is larger. It should be noted that the incremental manner of the size of the V-type microstructure 320 is generally nonlinear, and will be specifically designed according to the material characteristics of the light guide plate and the uniformity of the emitted light brightness. The increment method can be expressed by the following formula: 093127585 Form number Α 0101 Page 8 / Total 26 page 1003281617-0 1360689 100'08 04 Nuclear verification [0030] y = 0. 0001χ2 + 〇. 〇〇〇5χ + 〇 〇〇23; [0031] wherein the average distance between the X-type V-type microstructure 320 and the entrance face 31, and the y-line 320 microstructure width value, increases as x increases. It should be noted that the minimum width L of each of the V-type microstructures 320 is preferably at 1 〇 micron' but may be less than 1 〇 micron depending on the level of processing. The maximum width L can be 200 micrometers, so that the V5i microstructures 320 on the light guide plate 30 are not easily seen by the human eye, so that the diffusion sheet which causes a large energy loss can be removed. The V-shaped microstructure of this embodiment can be removed. The width of 32 l is a minimum of 1 μm and a maximum of 112 μm. [0033] At the same time, the complex V-type microstructures 320 are arranged in a direction away from the incident surface 31 from the dense to dense arrangement. That is, the closer the arrangement density is to the light source 40, the more sparse, and the spacing between each adjacent two V-shaped microstructures 32 is larger; the farther away from the light source 40, the closer the density is, and the spacing between each adjacent two V-type microstructures 320 is smaller. [0034] In the actual use process, if the light guide plate 30 has a phenomenon that the partial light transmittance is high, the size of the V-type microstructure can be reduced and the arrangement density of the V-type microstructure can be reduced; otherwise, if the local light transmittance is low It is possible to increase the size of the V-type microstructure and increase the arrangement density of the V-type microstructure. [0035] In order to facilitate the precision machining, the V-shaped microstructure 320 of the present embodiment is designed as a prismatic type, extending along one side of the incident surface 31 to the opposite side thereof, 'continuous without fracture. In the microstructure 320, any of its vertices is at the same height from the plane of the reflecting surface. At the same time, the respective V-type microstructures 320 are arranged in parallel with each other. [0036] The light guide plate is generally made of a synthetic resin material, and the material of the light guide plate 30 of the present embodiment is a polymethyl methacrylate β antireflection film 36-based metal or 093127585. Form No. 1010101 Page 9 of 26 1003281617-0 1360689 [0038] [0040] [0041] 100 years Ό August 04 every time the quality of the coating, such as aluminum film. The reflective surface 32 includes a raised V-shaped microstructure 320'. The over-plating process has a high reflectivity. In order to improve the energy utilization rate, the three sides except the incident surface 31 should also have a high reflectance, which can be achieved by plating the anti-reflection film 36. Light source 40 can be a point source, such as a light emitting diode, or a line source, such as a cold cathode tube. The light source 40 is mounted in a U-shaped lamp cover 41. The opening of the type II lamp cover 41 is opposite to the incident surface 31 of the light guide plate 30 for preventing light leakage and allowing the light to enter the light guide plate 30 through the incident surface 31. . Please refer to the sixth and seventh figures together, which reflects the angular distribution of the outgoing beam. It can be seen that the angles of the two directions are all within 30 degrees, and most of the light beams are emitted in a direction perpendicular to the exit surface 33 of the light guide plate 30. Please refer to the eighth and ninth figures together, which shows the change of brightness with position, and reflects the uniformity of the brightness of the light guide plate 30. The eighth picture shows the variation of the normalized brightness in the sixth picture with the distance from the distance source. The ninth picture shows the variation of the normalized brightness with position (along the direction perpendicular to the beam) in the seventh picture. It can be seen that the brightness of the light guide plate 30 is maintained at a uniformity of 82% or more in the above two directions. Referring to the tenth figure, the design of the above V-type microstructure 320 can also be applied to the wedge type light guide plate. In this embodiment, the wedge-shaped light guide plate 90 of the present invention comprises an incident surface 91, an exit surface 93, a reflecting surface 92 and the other three sides. The incident surface 91 is formed on the side of the light guide plate 90 adjacent to the light source 80. The exit surface 93 is formed on the top surface of the light guide plate 90. The reflecting surface 92 is formed on the bottom surface of the light guide plate 90, and is provided with an anti-reflection film (not shown). Similarly, the reflecting surface 92 is also formed with a plurality of V-shaped microstructures 920, Wizard 093127585 Form No. A0101 Page 10 / Total 26 Page 1003281617-0 1360689 1:00 years. 08.04. Correction_ outside of the light board 90 Raised. The range of the member angle of the V-shaped microstructure 920 and the first and second base angles formed by the plane of the reflective surface 9-2. are the same as in the previous embodiment. [0042] In use, part of the light emitted by the light source 80 enters the light guide plate 90 through the incident surface 91, reaches the V-shaped microstructure 920 of the reflective surface 92 and generates reflection, and is emitted from the exit surface 93 in a direction perpendicular to the exit surface 93. . It is worth noting that the backlight module consisting mainly of the side light source and the light guide plate 30 or 90 removes the reflection sheet, the diffusion sheet and the brightness enhancement sheet of the conventional backlight film group. The optical film is controlled and the outgoing light can be controlled in the direction of the vertical exit surface to realize the function of the conventional backlight film set, which is also the subject of the claimed invention. [0044] The invention controls the angle of the V-shaped microstructure and the reflecting surface with high reflection characteristics, and can conveniently control the light emitted from the light guide plate in the direction of the vertical exit surface, thereby maximizing the utilization of light energy. Such a light guide plate functionally improves brightness, and structurally removes an optical film such as a reflection sheet, a diffusion sheet, and a brightness enhancement sheet of the conventional backlight film group, simplifies the system and improves performance. [0045] At the same time, the present invention adjusts the V shape. The distribution and density of the microstructure can control the uniformity of the brightness of the emitted light, so that the uniformity in the two directions of vertical and parallel light source propagation is above 82%, and the half-width of the beam exit angle in these two directions is less than 30 It can be seen that most of the light beam is emitted in a direction perpendicular to the exit surface of the light guide plate. [0046] In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above is only the preferred embodiment of the present invention, 093127585 Form No. 101 0101 Page 11 / Total 26 Page 1003281617-0 1360689 G j year · August August Ό 4 · Day. Child is replaced; page is familiar with the case The equivalent modifications or variations of the skilled person in the spirit of the invention shall be included in the scope of the following patent application. * [Complicated Description] [0047] The first figure is a schematic structural view of a conventional backlight module. [0048] The second figure is a schematic cross-sectional view of a light guide plate disclosed in U.S. Patent No. 6,130,730. [0049] The third figure is a perspective view of a flat type light guide plate provided by the present invention. [0050] The fourth figure is an enlarged view of a portion IV along the third figure. [0051] The fifth figure is a schematic diagram of the optical path of the flat type light guide plate provided by the present invention. The sixth graph is a graph showing the normalized luminance and angle of the flat-plate type light guide plate of the present invention in a direction parallel to the light beam propagation direction (horizontal direction). [0053] The seventh figure is a graph showing the relationship between the normalized light luminance and the angle of the flat type light guide plate of the present invention in a direction perpendicular to the light beam propagation direction (vertical direction). [0054] The eighth graph is a graph showing the relationship between the normalized luminance and the positional variation of the distance source (along the direction of beam propagation) in the sixth graph. [0055] The ninth graph is a graph showing the relationship between the normalized luminance and the position (along the direction perpendicular to the beam propagation direction) in the seventh diagram. [0056] FIG. 10 is a perspective view of a wedge-shaped light guide plate provided by the present invention. [Description of main component symbols] [0057] Light guide plate: 30, 90 [0058] Incident surface: 31, 91 [0059] Reflecting surface: 32, 92 093127585 Form number A0101 Page 12/26 pages 1003281617-0 1360689. 100 years. August 04' day is positive _ page [0060] V-shaped microstructure: 320, 920 [0061] Exit surface: 3 3,9 3 [0062] Anti-reflection film: 36 [0063] Light source: 40, 80 [0064] Lampshade: 41 1003281617-0 093127585 Form No. A0101 Page 13 of 26