200846766 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 關於可朝不同的視角範圍來提供背光源之背光模組及其在 顯示裝置上的應用。 【先前技術】 % 酼著貝讯、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 顯示器具有高晝質、體積小、重量輕、低驅動電壓、與低 消耗功率等優點，因此被廣泛應用於個人數位助理 (Personal Digital Assistant; PDA)、行動電話、攝錄放影機、 筆》己型电月®、桌上型顯不器、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（1伽㈣^㈤此； 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盘重視。 —:般之液晶顯示裝置中，其背光源的出光方向大都固 定不變’且其光型（出光角度）分布維持在某些特定範圍，因 又的液顯示裝置僅可在特定的視角範圍内進行觀 看。以車用面板為例，現今汽車工業已逐漸提高車内娛樂 功能，汽車導航系統和勵影音系統已成為許多車内的基 摊備。然而，當汽車導航系統和卿影音系統同時使用 牯，車内則需裝設二台顯示裳置，因而增加設置成本，且 200846766 縮減車内的配置空間。 5月夢知、弟1圖’其緣示一種習知笼Q腐— 一 禋白知/夜日日顯不裝置的結構 不思圖。習知的液晶顯示裝詈孫刹雨「 丁衣置係利用「視差屏障（ρ_1αχ 此邮」方式來使影像可同時朝二方向顯示，以達成雔視 角(Duai View)同時顯示的功效。其係藉由—具有屏障ς罩 的彩色濾光片（Color Filter)91 〇來設置於液晶顯示模組92〇 ❿ 上，以分隔不同影像的光線朝二個方.向射出，因而可同時 由二個方向來觀看影像A和B。 然而:具有屏障光罩的彩色遽光片910製程複雜且困 難，因而增加實現Dual View的製程成本和困難度。 【發明内容】 因此本發明之-方面係在於提供一種背光模組，藉以 朝不同的視角範圍來提俣背光源。 _本發明之又一方面係在於提供一種背光模組及其在顯 不裝置上的應用，藉以同時朝不同的視角範圍來顯示不同 • 畫面影像。 根據本發明之實施例，本發明之背光模組至少包含有 一光板刀光層、第一光源及第二光源。分光層係設置於 V光板上，其中分光層設有複數個微結構。第一光源係設 置於導光板的第一側。第二光源係設置於導光板的第二側。 又，根據本發明之實施例，上述之背光模組至少包含 有間隙層’其形成於導光板和分光層之間，其中間隙層的 光折射率係分別實質小於導光板的光折射率和分光層的光 折射率，而導光板的光折射率係實質相同於分光層的光折 200846766 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朝不同的視角範圍來提供 - 为光源，因而本發明之背光模組所應用之液晶顯示裝置可 • 同時朝不同的視角範圍來顯示不同晝面影像，以達成雙視 角（Dual View)同時顯示的功效。 • 【實施方式】 请參照第2圖和第3圖，第2圖係繪示依照本發明之 第一貫鉍例之背光模組與液晶顯示模組的剖面示意圖，第3 圖係繪不依照本發明之第一實施例之背光模組的剖面示意 圖。本實施例之背光模組100較佳為側光式背光模組，其 设置於一液晶顯示模組200的下方，藉以形成一液晶顯示 裝置（Liquid Crystal Display ; LCD)。背光模組 100 包含有 设體110、導光板120、分光層13〇、第一光源14〇 '第二 _ 光源150、間隙層160及光學膜片組170。殼體110係用以 承载導光板120、分光層13〇、第一光源14〇、第二光源15〇、 間隙層160及光學膜片組17〇。導光板12〇係用以導引第一 光源140和第二光源15〇的發光射入分光層13〇，而分光層 _ 130係用以使第一光源14〇的發光朝第一視角範圍&出光， 並使第二光源150的發光朝第二視角範圍b出光，其中第 一光源140的位置係相對於第一視角範圍a，而第二光源 1+50的位置係相對於第二視角範圍b。因而本實施例之背光 模組1〇〇可同時朝至少二個視角範圍出光。間隙層16〇係 200846766 形成於導光板120和分光層13〇之間，光學膜片組17〇設 置於分光層130的上方，以進行不同目的之光學改善動作。 如第2圖所示，本實施例之殼體no具有光出射口 m 和膣室112和113。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11〇係由不透 光材貝所‘成，例如·塑化材料、金屬材料或上述材料之 組合。腔室112和113係分別形成於殼體11()的兩側，用 以分別容置第一光源140和第二光源15〇。腔室112和113 的内側側壁114可塗佈有高反射率材質，例如金、銀、鋁 或上述材質之組合，用以使部分未射入導光板12〇的入射 光可再反射至導光板120之中。 如第2圖所示，本實施例之第一光源14〇和第二光源 150例如為：冷陰極螢光燈管（c〇M Caih〇de200846766 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 providing a backlight to different viewing angle ranges and a display device therefor Application on. [Prior Art] % With the continuous development of Beixun and the communications industry, the market for Liquid Crystal Display (LCD) is booming. The liquid crystal display has the advantages of high quality, small size, light weight, low driving voltage, and low power consumption, so it is widely used in personal digital assistants (PDAs), mobile phones, video recorders, pens. Consumer communication or electronic products such as “Electronics®”, desktop displays, automotive displays, and projection TVs. In addition to the integrated circuit (1 gamma (four) ^ (five); 1C) industry and liquid crystal display manufacturing technology, the rapid development of these consumer communications or electronic products towards light, thin, short and small trends. Especially in computer products, in addition to high-performance, high-speed desktop computers, portable notebooks are highly valued. - In the general liquid crystal display device, the light-emitting direction of the backlight is mostly fixed' and the light-type (light-emitting angle) distribution is maintained in a certain range, because the liquid display device can only be within a specific viewing angle range. Watch it. Taking the vehicle panel as an example, the automotive industry has gradually improved the in-car entertainment function, and the car navigation system and the video system have become the basis for many cars. However, when the car navigation system and the qing audio and video system use 牯 at the same time, the car needs to install two display skirts, thus increasing the installation cost, and 200846766 reduces the configuration space in the car. In May, Meng Zhi and his brother 1 map ‘the origin of a kind of custom cage Q rot — a 禋 白知 / night day display device structure does not think. The well-known liquid crystal display device "Sun Ting Yu" uses the "parallax barrier (ρ_1αχ this post) method to enable the image to be displayed in both directions at the same time to achieve the simultaneous display of the Duai View. The color filter 91 〇 having a barrier mask is disposed on the liquid crystal display module 92 , to separate the light of different images toward the two sides, so that it can be simultaneously The directions are to view the images A and B. However, the color glazing sheet 910 having the barrier reticle is complicated and difficult to process, thereby increasing the manufacturing cost and difficulty of implementing the Dual View. [Invention] Therefore, the aspect of the present invention is to provide A backlight module for improving backlights in different viewing angle ranges. _ Another aspect of the present invention is to provide a backlight module and its application on a display device, thereby simultaneously displaying to different viewing angle ranges According to an embodiment of the invention, the backlight module of the present invention comprises at least a light knife blade layer, a first light source and a second light source. The light splitting layer is disposed at V In the board, the light splitting layer is provided with a plurality of microstructures. The first light source is disposed on the first side of the light guide plate, and the second light source is disposed on the second side of the light guide plate. Further, according to an embodiment of the present invention, the above The backlight module includes at least a gap layer formed between the light guide plate and the light splitting layer, wherein the light refractive index of the gap layer is substantially smaller than the light refractive index of the light guide plate and the light refractive index of the light splitting layer, and the light of the light guide plate The refractive index is substantially the same as the refractive index of the light splitting layer 200846766. 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 be different The range of viewing angles is provided as a light source, and thus the liquid crystal display device to which the backlight module of the present invention is applied can simultaneously display different kneading images to different viewing angle ranges to achieve dual viewing (Dual View) simultaneous display effects. [Embodiment] Please refer to FIG. 2 and FIG. 3, and FIG. 2 is a cross-sectional view showing a backlight module and a liquid crystal display module according to a first example of the present invention. A schematic diagram of a backlight module that is not in accordance with the first embodiment of the present invention is shown. The backlight module 100 of the present embodiment is preferably an edge-lit backlight module disposed under a liquid crystal display module 200. A liquid crystal display device (LCD) is formed. The backlight module 100 includes a body 110, a light guide plate 120, a light splitting layer 13A, a first light source 14'', a second light source 150, a gap layer 160, and an optical film. The light guide plate 120 is used for carrying the light guide plate 120, the light splitting layer 13〇, the first light source 14〇, the second light source 15〇, the gap layer 160, and the optical film group 17〇. The illuminating light guiding the first light source 140 and the second light source 15 射 is incident on the light separating layer 13 〇, and the light separating layer _ 130 is configured to emit the light of the first light source 14 朝 toward the first viewing angle range & The illumination of the light source 150 emits light toward the second viewing angle range b, wherein the position of the first light source 140 is relative to the first viewing angle range a, and the position of the second light source 1+50 is relative to the second viewing angle range b. Therefore, the backlight module 1 of the embodiment can simultaneously emit light toward at least two viewing angle ranges. The gap layer 16 is formed between the light guide plate 120 and the light-splitting layer 13A, and the optical film group 17 is disposed above the light-splitting layer 130 to perform optical improvement operations for different purposes. As shown in Fig. 2, the casing no of the present embodiment has a light exit opening m and chambers 112 and 113. The light exit port is used for light emission. In the embodiment, the housing 110 can form a lamp cover of a closed structure to prevent light from leaking out of the light exit port 111. The housing 11 is made of opaque light. The material is made of, for example, a plasticized material, a metal material or a combination of the above materials. The chambers 112 and 113 are formed on both sides of the casing 11 (), respectively, for accommodating the first light source 140 and the second light source 15A, respectively. The inner side walls 114 of the chambers 112 and 113 may be coated with a high reflectivity material such as gold, silver, aluminum or a combination of the above materials to allow some of the incident light that is not incident on the light guide plate 12 to be reflected back to the light guide plate. 120. As shown in FIG. 2, the first light source 14A and the second light source 150 of the present embodiment are, for example, a cold cathode fluorescent tube (c〇M Caih〇de).
Lamp ; CCFL)、熱陰極螢光燈（H〇t Cath〇de贝膽⑽恤Lamp; CCFL), hot cathode fluorescent lamp (H〇t Cath〇de shellfish (10) shirt
Lamp，HCFL)、發光二極體（Light-Emitting Diode ; LED)、 有機發光二極體（Organic Light Emitting Diode ; OLED)或電 激發光片（mectro-Luminescence ; EL)，用以側向發光至導 光板120中。其申，第一光源14〇和第二光源15〇係分別 由獨立的電源（未繪示）來控制開關動作。 如第2圖所示，本實施例之導光板12〇係容置於殼體 110内，以導引第一光源14〇和第二光源15〇的發光射入分 光層130,導光板120例如係利用射出成型的方式來製成平 板形結構，其材料例如為丙稀或ΡΜΜΑ。導光板12〇設有 出光面121和光反射面122。出光面121係位於導光板12〇 200846766 的正面，且對應於殼體110的光出射口 m，以使光線射入 刀光層130。光反射面122係位於導光板12〇的底面，且相 對於出光面⑵，用以全反射由第-光源、140和第二光源 150的側向光至光出射口 ηι。其中，光反射 面122可藉由 置反射片或塗佈鬲反射率材料（例如金屬材料），以達到 反射光線的功效。 —^參照第3圖和第4圖’第4圖係㈣依照本發明之 第一貫施例之局部分光層的立體示意圖。本實施例之分光 層130係没置於導光板12〇上，用以使分隔光線朝特定的 視角範圍出光。分光層13〇係以例如：光硬化型樹脂、丙 稀或PMMA等材料所製成。纟中，導光板12㈣光折射率 η!(約為1.5)係實質相同於分光層ι3〇之材質的光折射率 Μ ’因此，當光線由導光板12〇射入分光層13〇時，光線 可4乎不產生折線現象，亦即此時光線可不改變方向和角 度。分光層130設有複數個微結構131，此些微結構131 係複數個凸起結構，其凸設於分光層13〇和導光板12〇之 間，並密合地排列設置於導光板12〇的出光面121上，此 些微結構131的形狀可例如為錐形或半圓形。以錐形微結 構m為例，其錐形底角約為15度〜75度。間隙層16〇係 形成於導光板120和分光層13〇之間，其中間隙層16〇的 光折射率h係分別實質小於導光板12〇的光折射率〜和分 光層130的光折射率”，藉以使由導光板12〇或分光層 入射至間隙層16G的光線可形成全反射。此間隙層16〇例 如係以空氣為介質（ns約為丨），或者係充填入具有低光折射 率的材料來形成。本實施例之光學膜片組17〇例如為：擴 9 200846766 散片、棱鏡片、增亮膜（Brightness Enhancement Film; BEF)、 反射式增亮膜（Dual 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，其設置於分光層13〇的上 方，用以使由分光層13〇發出的光線可再進行不同目的之 光學改善動作。Lamp, HCFL), Light-Emitting Diode (LED), Organic Light Emitting Diode (OLED) or Electro-Luminescence (EL) for lateral illumination to In the light guide plate 120. It is claimed that the first light source 14A and the second light source 15 are respectively controlled by an independent power source (not shown) to control the switching action. As shown in FIG. 2, the light guide plate 12 of the present embodiment is housed in the housing 110 to guide the light emitted from the first light source 14 and the second light source 15 into the light splitting layer 130. For example, the light guide plate 120. The flat-shaped structure is formed by injection molding, and the material thereof is, for example, acryl or bismuth. The light guide plate 12 is provided with a light emitting surface 121 and a light reflecting surface 122. The light exiting surface 121 is located on the front surface of the light guide plate 12〇200846766 and corresponds to the light exit opening m of the housing 110 to allow light to enter the knife layer 130. The light reflecting surface 122 is located on the bottom surface of the light guide plate 12, and is used to totally reflect the lateral light from the first light source 140 and the second light source 150 to the light exit opening ηι with respect to the light exit surface (2). The light reflecting surface 122 can be made by reflecting a reflective sheet or coating a reflective material (for example, a metal material) to achieve the effect of reflecting light. -^ Referring to Fig. 3 and Fig. 4' Fig. 4 is a perspective view showing a portion of the optical layer in accordance with the first embodiment of the present invention. The light-splitting layer 130 of this embodiment is not placed on the light-guide plate 12A for emitting light to a specific viewing angle range. The light-splitting layer 13 is made of, for example, a photocurable resin, acryl or PMMA. In the middle, the light guide plate 12 (four) light refractive index η! (about 1.5) is substantially the same as the light refractive index of the material of the light splitting layer ι3 Μ ' Therefore, when the light is emitted from the light guide plate 12 into the light splitting layer 13 ,, the light There is no possibility of a fold line, that is, the light does not change direction and angle. The light-splitting layer 130 is provided with a plurality of microstructures 131. The microstructures 131 are a plurality of convex structures protruding between the light-splitting layer 13A and the light guide plate 12A, and closely arranged on the light guide plate 12A. The shape of the microstructures 131 on the light-emitting surface 121 can be, for example, a taper or a semi-circle. Taking the tapered micro-structure m as an example, the taper base angle is about 15 to 75 degrees. The gap layer 16 is formed between the light guide plate 120 and the light splitting layer 13A, wherein the light refractive index h of the gap layer 16〇 is substantially smaller than the light refractive index of the light guide plate 12〇 and the light refractive index of the light splitting layer 130” Therefore, the light incident from the light guide plate 12 or the light splitting layer to the gap layer 16G can form total reflection. The gap layer 16 is, for example, air as a medium (ns is about 丨), or is filled with a low light refractive index. The optical film group 17 of the present embodiment is, for example, expanded: 200846766, a prism sheet, a brightness enhancement film (BEF), a reflective brightness enhancement film (Dual Brightness Enhancement Film; DBEF). a non-multilayered reflective polarizing polarizer (DRPF) or any combination thereof, which is disposed above the light-splitting layer 13A for allowing the light emitted by the light-splitting layer 13 to be used for different purposes. Optical improvement action.
當本貫施例之背光模組進行出光時，第一光源140和 第二光源150係分別發出側向光至導光板丨2〇中，此時， 4刀光線可由直接射入分光層13 〇的此些微結構13 1中， 部分光線可在經導光板12〇的光反射面122反射後射入此 些微結構131中，其中由導光板12〇所射入至分光層13〇 的光線係分別以不同的角度來射入。又，此時，由導光板 120入射至間隙層i 6〇的光線係形成全反射，而無法入射至 :光層130中。當微結構i3i中的光線入射至間隙層i6〇 時，光線係形成全反射，並使光線朝一方向偏折。而當光 線由分光層130射出時，光線可形成折射而進一步朝此方 向偏折。 因此，藉由分光層130的此些微結構131和間隙層H 可限定光線僅在預定的方向和角度範圍内出光，亦即可3 別限定光線僅在特定的視角範圍内射出，其中，當第二^ :150關閉時，第一光源14〇的發光係朝第一視田角範圍7 而當第-光源、⑽關閉時，第二光源W的發光〇 視角範圍b出光。因此，本實施例之背光模組1〇 了朝不同的視角範圍來提供背光源。 當本實施狀背光懸顧於液晶顯Μ置時，背夫 200846766 模、、且100的第一光源14〇和第二光源15〇可依一預定頻率 來分別父替進行開閉動作，並同步對應於液晶顯示模組200 的晝面更新動作，藉以同時朝第-視角範目a和第二視角 範圍b來顯示不同晝面。因此，本實施例之背光模組所應 用之液晶顯示裝置可同時朝不同的視角範圍來顯示不同晝 面影像’因而可達成雙視角（Dual View)同時顯示的功效。 凊芩照第5圖，其繪示依照本發明之第二實施例之分 光層的立體示意圖。以下僅就本實施例與第一實施例之相 /、處進行。尤明’關於相似處在此不再贅述。相較於第一實 施例，第二實施例之分光層330的每一此些微結構331為 長條狀的稜形結構，且每一此些微結構331的兩側面係分 別相對於第一光源14〇和第二光源15〇，藉以使第一光源 140和第二光源15〇的發光可有效地僅朝預定的視角範圍 射，提升單一視角範圍内的岀光效率s 請參照第ό圖，其繪示依照本發明之第三實施例之導 光板和分光層的剖面示意圖。以下僅就本實施例與第一實 施例之相異處進行說明，關於相似處在此不再贅述。相較 於第一實施例，第三實施例之分光層430的此些微結構431 係複數個凹陷結構，其凹設於分光層13〇和導光板12〇之 間，此些微結構431的凹陷形狀可例如為錐形或半圓形。 此時，分光層430和導光板120之間不具有間隙層ι6〇，相 對的係在每一此些微結構431的凹陷形狀中形成間隙 460，其中間隙460的光折射率lls，係分別實質小於導光板 120的光折射率ηι和分光層430的光折射率h，藉以使由 導光板120或分光層430入射至間隙460的光線可形成全 11 200846766 反射。因此’藉由分光層430的此些微結構431和間隙層 460可分別限定光線僅在特定的視角範圍内射出，用以朝不 同的視角範圍來提供背光源。 由上述本發明的實施例可知，本發明之背光模組可朝 不同的視角乾圍來提供背光源。當本發明之背光模組應用 於液晶顯示裝置時，液晶顯示裝置可同時朝不同的視角範 圍來顯不不同晝面影像，因而可同時由不同的視角範圍來 朝單一顯示裝置來觀看不同的影像，減少額外顯示裝置的 設置。 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 =内田可作各種之更動與潤飾，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。 【圖式簡單說明】 Λ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： =1圖係繪示一種習知液晶顯示裝置的結構示意圖。 、第_2圖係繪示依照本發明之第一實施例之背光模組與 液晶顯示模組的剖面示意圖。 弟3圖係繪示依照本發明之第一實施例之背光模組之 句光模組的結構示意圖。 ^圖係㈣依照本發明之第—實施例之局部分光層 的立體示意圖。 第5圖係緣示依照本發明之第二實施例之分光層的立 12 200846766 體示意圖。 第6圖係繪示依照本發明之第三實施例之導光板和分 光層的剖面示意圖。 【主要元件符號說明】When the backlight module of the present embodiment emits light, the first light source 140 and the second light source 150 respectively emit lateral light into the light guide plate ,2〇. At this time, the 4-blade light can be directly incident into the light-splitting layer 13 〇 In the microstructures 13 1 , part of the light is reflected by the light reflecting surface 122 of the light guide plate 12 , and then incident into the microstructures 131 , wherein the light rays incident on the light separating layer 13 由 by the light guide plate 12 分别 are respectively Inject at different angles. Further, at this time, the light incident on the gap layer i 6 由 by the light guide plate 120 is totally reflected, and cannot be incident on the light layer 130. When the light in the microstructure i3i is incident on the gap layer i6, the light is totally reflected and deflects in one direction. When the light is emitted from the light-splitting layer 130, the light can be refracted and further deflected in this direction. Therefore, the micro-structures 131 and the gap layer H of the light-splitting layer 130 can define that the light is emitted only in a predetermined direction and an angle range, that is, the light can be emitted only in a specific viewing angle range, wherein When the LCD is turned off, the illumination of the first light source 14A is toward the first viewing angle range 7 and when the first light source and (10) are turned off, the illumination angle range b of the second light source W is emitted. Therefore, the backlight module 1 of the present embodiment provides a backlight for different viewing angle ranges. When the backlight of the embodiment is suspended from the liquid crystal display, the first light source 14 〇 and the second light source 15 100 of the back-and-forth 200846766 mode, and 100 can be respectively opened and closed according to a predetermined frequency, and synchronously corresponding The face-up updating operation of the liquid crystal display module 200 is performed to simultaneously display different facets toward the first-view angle a and the second angle range b. Therefore, the liquid crystal display device used in the backlight module of the present embodiment can display different facial images simultaneously to different viewing angle ranges, thereby achieving the dual viewing (Dual View) simultaneous display effect. Referring to Figure 5, there is shown a perspective view of a light splitting layer in accordance with a second embodiment of the present invention. Hereinafter, only the embodiment and the first embodiment are performed. You Ming’s similarities are not repeated here. Each of the microstructures 331 of the light-splitting layer 330 of the second embodiment is an elongated prism-shaped structure, and the two side surfaces of each of the microstructures 331 are respectively opposite to the first light source 14 respectively. And the second light source 15〇, so that the light emission of the first light source 140 and the second light source 15〇 can be effectively emitted only to a predetermined viewing angle range, thereby improving the light-emitting efficiency in a single viewing angle range. Referring to the second drawing, A schematic cross-sectional view of a light guide plate and a light splitting layer according to a third embodiment of the present invention is shown. In the following, only the differences between the embodiment and the first embodiment will be described, and the similarities will not be described herein. Compared with the first embodiment, the microstructures 431 of the light-splitting layer 430 of the third embodiment are a plurality of recessed structures recessed between the light-splitting layer 13A and the light guide plate 12A, and the concave shapes of the microstructures 431 It can be, for example, a cone or a semicircle. At this time, there is no gap layer ι6〇 between the light-splitting layer 430 and the light guide plate 120, and a gap 460 is formed in the concave shape of each of the microstructures 431, wherein the light refractive index lls of the gap 460 is substantially smaller than The light refractive index η of the light guide plate 120 and the light refractive index h of the light-splitting layer 430 are such that light incident on the gap 460 by the light guide plate 120 or the light-splitting layer 430 can form a full reflection of 200846766. Thus, such microstructures 431 and gap layers 460 of the light-splitting layer 430 can respectively define light rays to be emitted only within a particular viewing angle range to provide a backlight for different viewing angle ranges. It can be seen from the above embodiments of the present invention that the backlight module of the present invention can provide a backlight by being surrounded by different viewing angles. When the backlight module of the present invention is applied to a liquid crystal display device, the liquid crystal display device can display different images from different viewing angles at the same time, so that different images can be viewed from different viewing angles to a single display device. , reducing the settings of the additional display device. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the scope of the present invention, and the scope of protection of the present invention can be varied without departing from the spirit and scope of the present invention. This is subject to the definition of the scope of the patent application. BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; Schematic diagram of the structure. 2 is a cross-sectional view showing a backlight module and a liquid crystal display module according to a first embodiment of the present invention. 3 is a schematic structural view of a sentence light module of a backlight module according to a first embodiment of the present invention. Figure 4 is a perspective view of a portion of an optical layer in accordance with a first embodiment of the present invention. Fig. 5 is a schematic view showing the body of a light splitting layer according to a second embodiment of the present invention. Figure 6 is a cross-sectional view showing a light guide plate and a light-scattering layer in accordance with a third embodiment of the present invention. [Main component symbol description]
A、B :影像 a :第一視角範圍 b :第二視角範圍 η!、n2、n3、n3’ ··光折射率 100 :背光模組 110 ： 殼體 111 :光出射口 112、 113 :腔室 114 ：内侧侧壁 120 : 導光板 121 :出光面 122 ： 光反射面 13 0 :分光層 131 ： 微結構 140 :第一光源 150 ： 第二光源 160 :間隙層 170 ： 光學膜片組 200 ·液晶顯不模組 330 :分光層 331 ： 微結構 430 :分光層 431 ： 微結構 460 :間隙 910 :彩色濾光片 920 ： 液晶顯不4旲組 13A, B: image a: first viewing angle range b: second viewing angle range η!, n2, n3, n3' · · light refractive index 100: backlight module 110: housing 111: light exit opening 112, 113: cavity Room 114: inner side wall 120: light guide plate 121: light-emitting surface 122: light-reflecting surface 13 0: light-splitting layer 131: microstructure 140: first light source 150: second light source 160: gap layer 170: optical film group 200 The liquid crystal display module 330: the light splitting layer 331: the microstructure 430: the light splitting layer 431: the microstructure 460: the gap 910: the color filter 920: the liquid crystal display group 4