200944896 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種經濟型背光模組。 【先前技術】 習知之背光模組(backlight module)有如第1圖所示者，係包 括：一導光板(L)側設一光源(S)，一反射器(R)置於導光板(L)之下 ❹ 方’一顯示器〇)，如：LCD)，第一及第二增亮膜(Bl，B2)分別 失置於上，下光擴散膜(F卜F2 ; light diffusing film)之間；而該 上、下光擴散膜(FI，F2)分別緊鄰該顯示器(D)與該導光板(L)者， 由是光源(S)所投射之光藉由導光板底部之擴散點(L1)破壞光之 内部全反射’使均勻散射，並輔以底部反射器之反射，導光 板出光穿經光擴散膜及增亮膜，以達該顯示器(D)，由是以增加 〇 該背光模組之光均勻度及亮度等光學特性者。 唯習知之光擴散膜(light diffusing film)必須假以一定之製作 程序而衍生相當之製作成本。例如美國專利第7,218,45〇號即曾 揭示-光擴散膜’彼係於一基層之上，積層以一光擴散層，主要 係令光擴散微粒均勻分散於-膠合麟脂之+再塗佈、設置或黏 設於該基層之上。於製成該光擴散膜之過財，仍需涉及到一些 單元操作(unit operation)或製程之問題，如：令微粒於樹脂中均句 200944896 分散之操作，令光擴散層與基層之積層(laminati〇n)步驟；以及汽 粒顆粒大小、微粒與樹脂之比率之調控等因素仍多，故會影響光 擴散膜及相關背光模組之成本及品質、特性。 本案發明人有鑒於此，乃加研究創新，揭示出本發明新穎之 經濟型背光模組。 【發明内容】 本發明之目的旨在提供一種經濟型背光模組，係於一設有光 源之導光板與顯示器（如：液晶顯示器）之間夹設以至少一層光擴 散紙（light diffusing paper)，以增加穿設其間之光均勻度等 光學特性者。 本發明之可取實體，可由以下說明書配合所附諸圖式而得以 明晰之。 【實施方式】 參閱第2圖’本發明背光膜組係、包括：至少—光擴散紙(1，_ diffusing paper)例如圖示之兩光擴散紙⑴者；至少一增亮膜(2， brightness enhancement fllm 或 BEF); 一導光板⑶；—顯示器(4， 如液晶顯示1 LCD者);一光源⑶如冷陰極螢光燈(ccfl)或㈣ 燈等；以及一反射器或反射膜(6)者。 該兩光擴散紙⑴可分別緊鄰或緊貼該顯示器⑷與該導光板⑶ 200944896 者；且可夾置兩增亮膜(2，2)於該兩光擴散紙(1，1)之間。 該導光板(3)底部尚可設置多數光擴散點(dot)或光擴散圖案、 凹凸結構、光擴散微結構’如圖示之編號(31)者，以增加導光板 出光之均勻作用。 如是’光源(5)之光進入導光板⑶后藉導光板底部擴散點(31) 破壞内部全反射’使均勻散射，並輔以底部反射器(6)之反射，其 ❹出光向上穿經光擴散紙(1)及增亮膜(2)乃增加光均勻度及亮度， 以達該顯示器(4)者。 該增亮膜(2)可選自習知之增亮膜，其上層可為稜鏡層 (prismatic layer) ’其基層則為透明之聚碳酸脂(pc)或聚乙烯對苯 '二酸酯(PET)層者，以增光之亮度者。該增亮膜(2)亦可為其他之 結構或積層者。 0 省光擴散紙(1)可為：一霧狀紙(frosted or haze paper)，含纖維 素(cellulose)之半透明紙如描圖紙(tradng paper)，以高分子膠合劑 換合纖維之複合材薄膜或其他半透明人造紙。其中該光擴散紙⑴ 之霧度(haze value)宜介於1〇〜85%之間，唯本發明並未加以限制。 藉由該光擴散紙(1)之作用，可使穿經其間之光線，增加光均 勻度，再配合增賴⑴增加光之亮度，遂能增加本發明背光模組 之光亮度及光均勻度。 該光擴散紙(1)之中係添加入光擴散材料(丨igh t diffusing or 200944896 scatte如^如_增雜之域雜者4可於觀中添加防 水材料如腊等。唯本發明並未限制該光擴散紙⑴之組成份及材 料。 基於成本及市場性之考量，本發明之光擴散紙可選自描圖紙 (tracing paper)之半透明紙者。 本發明中’該光擴散紙⑴可如第2圖所示，以上、下兩張光 ❺擴散紙(1)央置兩層增亮膜(2)於該顯示器(4)與該導光板⑶之間。 當然，亦可僅選用單張之光擴散紙⑴，介於該顯示器⑷與導光 板(3)之間，圖中未示出。 本發明亦可如第3圖所示，於該顯示器⑷與該導光板⑶之 -間，夾置單層之光擴散紙(1)與單層之增亮膜(2)，此亦構成本發 明之可取實施例。 〇 如第4圖所示，則令多張光擴散紙(1)夾設於該導光板(3)與該 顯示益(4)之間，由是形成本發明他一可取之實施例。 本發明中，亦可於該光擴散紙(1)基層上成型、印製、連設、 黏置或積層以一稜鏡層(21 ’Prismatic layer)俾形成一、、以紙為基 之立、日冗膜（PaPe卜based brightness enhancement film，可簡稱 PBEF”）’由是構成一光擴散紙之基層⑴可賦予光擴散性，而 上層稜鏡層(21)則可集光增加光之亮度，如是疮成一兼具集光及 光擴散作用之增亮膜(2a)或光學膜(如第5圖所示)者。 200944896 如第6圖所示，可於該導光板(3)與顯示器(4)之間，失置兩層 如第5晒示之、、以紙為基之增亮膜，，（2a)，該上、下層增亮膜 ㈣之棱鏡層(21)之上、下稜鏡面係互呈正交，即互以9〇度角投 影地正交者(亦即上、下各稜鏡或稜鏡陣列之祿鏡頂峰脊線係投 影地互呈正交或互相交成90度角者）。 如第7圖所示者’則將第6圖中兩層之、紙為基之增亮彰 ❹（2a)擇其中之-層’以一般之增亮膜(2，即未以光擴散紙為基層 者)取代之’由是構成第6圖以外之另一實施例。 如第8圖所示，係自第5圖之增亮膜(2a)之光擴散紙(丨)底部 再塗覆一層防護層（11)’使發揮防水、抗靜電及抗翹曲之作用者。 -本發明中’該光擴散紙(1)係製自中性(pH二7)，不易黃化之材質 者。 0 由於本發明之揭示，可以一成本低廉，可輕易購自市售之描 圖紙等光擴散紙(1)取代習知之光擴散膜或光擴散片，可大大降低 了光學薄膜及背光模組之成本。 本發明可於不違本發明之精神及範疇下作適當之修飾或改 變’本發明實不限制之。 【圖式簡單說明】 第1圖係習知背光模組之元件組成示意圖。 200944896 第2圖係本發明背光模組組成之第一實施例。 第3圖係本發明背光模組組成之第二實施例。 第4圖係本發明背光模組組成之第三實施例。 第5圖係本發明背光模組組成之第四實施例。 第6圖係本發明背光模組組成之第五實施例。 第7圖係本發明背光模組組成之第六實施例。 ❹ 第8圖為自本發明第5圖所示增亮膜之底部再塗覆一防護層之剖 【主要元件符號說明】 1·.. …光擴散紙； 2..· ...增亮膜(BEF); 3... …導光板； 4··. 5... …光源； 6.·. …反射器； 31... ...光擴散點（dot); 2a..· …以紙為基之增亮膜； 21... 2b... ...棱鏡層； …塗覆防護層之增亮膜 11... 〇 …防護層；200944896 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to an economical backlight module. [Previous Art] A conventional backlight module has a light source (S) disposed on a side of a light guide plate (L) and a light guide plate (R) disposed on a light guide plate (L). Under the ' square 'one monitor 〇), such as: LCD), the first and second brightness enhancement films (Bl, B2) are respectively placed between the upper and lower light diffusion films (F, F2; light diffusing film) And the upper and lower light diffusion films (FI, F2) are respectively adjacent to the display (D) and the light guide plate (L), and the light projected by the light source (S) is diffused by the bottom of the light guide plate (L1) Breaking the internal total reflection of light 'to make uniform scattering, and supplemented by the reflection of the bottom reflector, the light guide plate passes through the light diffusion film and the brightness enhancement film to reach the display (D), thereby increasing the backlight mode Group optical properties such as light uniformity and brightness. It is only known that the light diffusing film must be derived from a certain manufacturing process with a certain production cost. For example, U.S. Patent No. 7,218,45 discloses that a light diffusing film is attached to a base layer, and a light diffusing layer is laminated, mainly for uniformly dispersing the light diffusing particles in the gelled resin. , set or glued on top of the substrate. In the production of the light-diffusing film, there are still some problems involved in unit operation or process, such as the operation of dispersing the particles in the resin in 200944896, so that the light diffusion layer and the base layer are laminated ( The laminati〇n) step; and the regulation of the particle size of the particles, the ratio of the particles to the resin, and so on, will affect the cost, quality and characteristics of the light diffusing film and related backlight modules. In view of this, the inventors of the present invention have discovered a novel and economical backlight module of the present invention. SUMMARY OF THE INVENTION An object of the present invention is to provide an economical backlight module in which at least one layer of light diffusing paper is interposed between a light guide plate provided with a light source and a display (eg, a liquid crystal display). In order to increase the optical characteristics such as the uniformity of light passing through it. The preferred embodiments of the present invention can be clarified by the following description in conjunction with the accompanying drawings. [Embodiment] Referring to Figure 2, the backlight film assembly of the present invention comprises: at least one light diffusing paper (1), for example, two light diffusing papers (1); at least one brightness enhancing film (2, brightness) Enhancement fllm or BEF); a light guide plate (3); a display (4, such as liquid crystal display 1 LCD); a light source (3) such as a cold cathode fluorescent lamp (ccfl) or (four) lamp; and a reflector or reflective film (6) )By. The two light diffusing sheets (1) may be respectively adjacent to or in close contact with the display (4) and the light guide plate (3) 200944896; and two brightness enhancing films (2, 2) may be interposed between the two light diffusing sheets (1, 1). At the bottom of the light guide plate (3), a plurality of light diffusion dots or light diffusion patterns, concave and convex structures, and light diffusion microstructures may be disposed as shown in the figure (31) to increase the uniformity of the light output of the light guide plate. For example, if the light of the light source (5) enters the light guide plate (3), the diffusion point (31) at the bottom of the light guide plate destroys the total internal reflection 'to make uniform scattering, and is supplemented by the reflection of the bottom reflector (6), and the light is transmitted upward through the light. The diffusion paper (1) and the brightness enhancement film (2) increase the light uniformity and brightness to reach the display (4). The brightness enhancing film (2) may be selected from a conventional brightness enhancing film, and the upper layer may be a prismatic layer 'the base layer is a transparent polycarbonate (pc) or a polyethylene terephthalate (PET). The layer is to increase the brightness of the light. The brightness enhancing film (2) may also be other structures or laminates. 0 provincial light diffusion paper (1) can be: frosted or haze paper, translucent paper containing cellulose, such as trav paper, and polymer composite with polymer glue Film or other translucent papermaking. The haze value of the light diffusing paper (1) is preferably between 1 〇 and 85%, which is not limited by the invention. By the action of the light diffusing paper (1), the light passing through between them can be increased, and the light uniformity can be increased, and the brightness of the light can be increased by adding (1), and the brightness and uniformity of the backlight module of the present invention can be increased. . The light diffusing paper (1) is added to the light diffusing material (丨igh t diffusing or 200944896 scatte such as _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Limiting the composition and material of the light diffusing paper (1). The light diffusing paper of the present invention may be selected from a translucent paper of a tracing paper based on cost and market considerations. In the present invention, the light diffusing paper (1) As shown in Fig. 2, the upper and lower two aperture diffusion papers (1) are disposed with two brightness enhancement films (2) between the display (4) and the light guide plate (3). Of course, only the selection may be used. a single sheet of light diffusing paper (1) interposed between the display (4) and the light guide plate (3), which is not shown. The present invention can also be as shown in Fig. 3 between the display (4) and the light guide plate (3). Separating a single layer of light diffusing paper (1) and a single layer of brightness enhancing film (2), which also constitutes a preferred embodiment of the present invention. As shown in Fig. 4, a plurality of light diffusing papers (1) It is sandwiched between the light guide plate (3) and the display benefit (4), which is a preferred embodiment of the invention. In the present invention, the light diffusion paper (1) base can also be used. The layer is formed, printed, connected, adhered or laminated with a layer of 21 (Prismatic layer) to form a paper-based vertical film (PaPe-based brightness enhancement film). PBEF")' is based on the base layer (1) which constitutes a light diffusing paper, and the upper layer of enamel layer (21) can collect light to increase the brightness of light, such as the combination of sore and light diffusion. Bright film (2a) or optical film (as shown in Figure 5) 200944896 As shown in Figure 6, between the light guide plate (3) and the display (4), two layers can be lost, such as the fifth The paper-based brightness enhancement film, (2a), the upper and lower layer brightness enhancement film (4) on the prism layer (21) and the lower jaw surface are orthogonal to each other, that is, 9 degrees to each other. The orthogonal projection of the angular projections (that is, the top and bottom ridges of the upper and lower 稜鏡 or 稜鏡 arrays are projected orthogonally or intersect each other at a 90 degree angle). As shown in Fig. 7 Then, the paper-based brightening of the two layers in Fig. 6 (2a) is replaced by a general brightening film (2, which is not based on light diffusion paper). Is the sixth Another embodiment other than the figure. As shown in Fig. 8, the bottom of the light-diffusing paper (丨) of the brightness enhancement film (2a) of Fig. 5 is further coated with a protective layer (11)' to make it waterproof and resistant. The function of static electricity and anti-warping. - In the present invention, the light diffusing paper (1) is made of a neutral (pH 2:7) material which is not easily yellowed. 0 Due to the disclosure of the present invention, it can be inexpensive. Light diffusing paper (1), such as commercially available tracing paper, can be easily replaced by a conventional light diffusing film or light diffusing sheet, which can greatly reduce the cost of the optical film and the backlight module. The invention may be modified or altered as appropriate without departing from the spirit and scope of the invention. [Simple description of the drawing] Fig. 1 is a schematic diagram showing the components of a conventional backlight module. 200944896 Figure 2 is a first embodiment of the backlight module of the present invention. Figure 3 is a second embodiment of the backlight module of the present invention. Figure 4 is a third embodiment of the backlight module of the present invention. Figure 5 is a fourth embodiment of the backlight module of the present invention. Figure 6 is a fifth embodiment of the backlight module of the present invention. Figure 7 is a sixth embodiment of the backlight module of the present invention. ❹ Figure 8 is a cross-section of a protective layer applied to the bottom of the brightness enhancement film shown in Figure 5 of the present invention. [Main component symbol description] 1·.....light diffusion paper; 2..·...brightening Film (BEF); 3...light guide; 4·.. 5...light source; 6.·....reflector; 31...light diffusing point (dot); 2a..· ...paper-based brightness enhancement film; 21... 2b... prism layer; ... brightness enhancement film 11 coated with protective layer... 〇... protective layer;