TWI327249B

TWI327249B - Light guide plate for liquid crystal display back light units and liquid crystal display back light unit using the same

Info

Publication number: TWI327249B
Application number: TW094135280A
Authority: TW
Inventors: Chul Goo Chi; Man Suk Kim; O Yong Jeong
Original assignee: Cheil Ind Inc
Priority date: 2004-10-09
Filing date: 2005-10-07
Publication date: 2010-07-11
Also published as: KR100661147B1; KR20060051190A; TW200630705A

Description

1327249 九、發明說明：【發明所屬之技術領域】本㈣是日有㈣-種^顯示器背光單元之導光板及使用 ★導先板之液日曰顯不益背光單元，且特別是有關於一種包括形成於上下表面的上稜鏡結構及網點稜鏡的液晶顯示器背光單元之導光板及使用此導光板之液晶顯示器背光單元。【先前技術】一般而言，液晶顯示器是—插且亡> s ^ 疋種具有液晶的顯示器，液晶係為 ’ 介於液體與固體之間的物質，兑凌曰士+ , ^ ，、臾在兩層具有電極的玻璃基板之間。當電場作用於液晶時，液晶顯示器即呈現出畫面或影像。液晶顯示器無法自行發光，因此需藉助背光單元以提供一貼近於液晶顯示器之光源。光線從背光單元射出而直射液晶顯示器之-具有液晶之面板。其中’此些液晶均勻地排列於面板中，使得傳輸光線量被控制以顯示影像。請參照第1圖，其繪示乃傳統液晶顯示器背光單元1〇的爆炸圖。根據用以射出光線之光源的位置，液晶顯示器之背光單元 •係可分為直下式背光單元及旁側式背光單元。直下式背光單元之光源直接配置於LCD面板1〇〇之下，而旁側式背光單元之光源配置於LCD面板100之一側。而於冑！中的背光單元係為旁側式背光單元。如第1圖所示，傳統之背光單元1〇包括了一光源1〇5，一導光板110, 一反射板115, 一擴散板120, 一稜鏡片125及一保護片13 0。光源105係一開始射出光線於液晶顯示器中之一部分，而可作為光源105之燈管有相當多樣的選擇。其中，較佳的是冷陰極 TW2554PA 6 1327249 螢光燈管（cold cathode fluorescent lamp，CCFL )，雖然冷陰極螢光耗電量較低，但冷陰極螢光燈管可射出相當明亮的白光，十分適用於液晶顯示器中。導光板110配置於LCD面板100之下，且位於光源1 之一側。導光板110係用以將光源105所射出的點光線轉換成面光線，且投射面光線至導光板110的上表面。反射板115配置於導光板11〇的下表面，係用以反射導光板 110之下表面所射出之光線至LCD面板1〇〇。擴政板120配置於導光板11〇之上表面，係用以均勻地擴散從導光板110之上表面所射出的光線。當擴散板120將光線水平地及垂直地擴散之後，光線的亮度會急遽地減少。因此，稜鏡片125用以折射及聚集光線，以增加光線的梵度。保護板130配置於稜鏡片125之上表面。保護板13〇係用以防止稜鏡片被到傷及產生摩爾波紋效應（M〇ireeffect)。當稜鏡片125為一具有垂直方向及水平方向之雙層結構時，即會產生上述之摩爾波紋效應。1327249 IX. Description of the invention: [Technical field to which the invention pertains] This (4) is a light guide plate for a backlight unit of a day (four)-type display, and a backlight unit using a liquid guide, and particularly relates to a backlight unit. The light guide plate of the liquid crystal display backlight unit formed on the upper and lower surfaces, and the liquid crystal display backlight unit using the light guide plate. [Prior Art] In general, a liquid crystal display is a plug-in and a dying > s ^ display having a liquid crystal, and the liquid crystal is a substance between a liquid and a solid, and is a gentleman + , ^ , 臾Between two layers of glass substrates with electrodes. When an electric field acts on the liquid crystal, the liquid crystal display presents a picture or image. The liquid crystal display cannot emit light by itself, so it is necessary to use a backlight unit to provide a light source close to the liquid crystal display. The light is emitted from the backlight unit and directly directed to the liquid crystal display - a panel having a liquid crystal. Wherein the liquid crystals are evenly arranged in the panel such that the amount of transmitted light is controlled to display an image. Referring to Fig. 1, there is shown an explosion diagram of a conventional liquid crystal display backlight unit. According to the position of the light source for emitting light, the backlight unit of the liquid crystal display can be divided into a direct type backlight unit and a side type backlight unit. The light source of the direct type backlight unit is directly disposed under the LCD panel, and the light source of the side backlight unit is disposed on one side of the LCD panel 100. And Yu Yu! The backlight unit in the middle is a side backlight unit. As shown in Fig. 1, the conventional backlight unit 1 includes a light source 1〇5, a light guide plate 110, a reflection plate 115, a diffusion plate 120, a die piece 125, and a protective sheet 130. The light source 105 initially emits light in a portion of the liquid crystal display, and the lamp that can be used as the light source 105 has a wide variety of options. Among them, a cold cathode TW2554PA 6 1327249 cold cathode fluorescent lamp (CCFL) is preferred. Although the cold cathode fluorescent power consumption is low, the cold cathode fluorescent lamp can emit quite bright white light. Suitable for use in liquid crystal displays. The light guide plate 110 is disposed under the LCD panel 100 and located on one side of the light source 1. The light guide plate 110 is configured to convert the point light emitted by the light source 105 into a surface light, and project the surface light to the upper surface of the light guide plate 110. The reflector 115 is disposed on the lower surface of the light guide plate 11b to reflect the light emitted from the lower surface of the light guide plate 110 to the LCD panel. The expansion board 120 is disposed on the upper surface of the light guide plate 11b to uniformly diffuse the light emitted from the upper surface of the light guide plate 110. When the diffuser 120 diffuses the light horizontally and vertically, the brightness of the light is drastically reduced. Thus, the cymbal 125 is used to refract and concentrate the light to increase the Brahman of the light. The protective plate 130 is disposed on the upper surface of the cymbal 125. The protective plate 13 is used to prevent the bracts from being damaged and the M〇ire effect. The above-described moiré effect is produced when the cymbal sheet 125 is a two-layer structure having a vertical direction and a horizontal direction.

一雖未繪示於第1圖中，I統的背光單S 10 包括一框架或 -機殼、-背蓋或-燈罩’個別組成背光單元10的元件係配置於此框架或機殼中。並且為了維㈣光單元1G的結構強度，背蓋或燈罩提供保護及支撐背光單元10之功能。乃光線經由光源105 請同時參照第2A圖及第2B圖，其纷示發散至導光板110的放大刮面圖。夕“^第2A圖所示’光源1()5通常配置於旁側式背光單元10 1沾（在LCD電視中，光源1G5係直接配置於LCD面板之後 W〜果光線無法均句地傳輸至整個背光單元的區域。也就是Although not shown in Fig. 1, the backlight unit S 10 includes a frame or a casing, a back cover or a lamp cover. The components constituting the backlight unit 10 are individually disposed in the frame or the casing. And in order to maintain the structural strength of the (4) light unit 1G, the back cover or the lamp cover provides the function of protecting and supporting the backlight unit 10. The light passes through the light source 105. Referring to FIGS. 2A and 2B simultaneously, the light is diverged to the enlarged scraping surface of the light guide plate 110.夕"^2A shows that the light source 1() 5 is usually disposed in the side-type backlight unit 10 1 (in an LCD TV, the light source 1G5 is directly disposed on the LCD panel, and the light cannot be uniformly transmitted to the The area of the entire backlight unit.

TW2554PA 7 1327249 .•說1光皁元之側邊比背光單元之其他區域更加明亮。為了 ‘此現象產生，導光板⑽即派上用場。此導光板110係由高強产的透賴克力（ac糾材質所製成，不但重量輕且不易破裂變形^ 更具有商透光之特性。更進一步來說，導光板⑽用以均勾投射從光源⑽所發散 •的光線至導光板110之上表面。當光源置放於導光板的側表面，且光線從光源中發散出來時，待拆解背光單元後，即可觀光板110的表面亮度並不均勻，且光線聚集在導光板㈣的另一端。這是因為導光板110將光源所發散的光線導至另一側的緣故。因此’如第2B圖所示，導光板11G下方形成了凸起扁平部 113,此結構所設計之形狀係為了與位於導光板11〇之側表面的先源H)5保有-段距離，以致於光線會在凸起扁平部⑴上擴散及反射。所以，光線均钱從導光板11()的整個表面發散。因為凸起爲平部U3所形成的圖案化設計，使得面光源具有相當高的明党度且液晶顯示器的LCD面板也獲取了均勾的光線。當液晶顯示器依據上述方法製造時，仍然有一現象產生，即光線的強度在凸起扁平部113形成的地方相當高。另一方面，光線的強度在凸起扁平部113未形成之處很低，意即LCD面板將產生斑點。因此，LCD面板的可視度也跟著降低。特別是，當 LCD面板的尺寸很大時，到達離光源1()5較遠區域之光線是不田夠的。因此，離光源105較遠的區域中的光線強度很低。為了解決上述之問題，意即為了增加光線的均勻度，在應用上係會加入擴散板12〇及棱鏡片125。然而，使用擴散板㈣和棱鏡片125卻會增加背光單元的製造成本。因此，如何獲取具有高可視度、高亮度及高均勻度於LCd 之LCD面板上表面的面光源，實為目前所需探討的重要議題。TW2554PA 7 1327249 .• The side of the 1 light soap element is brighter than the other areas of the backlight unit. In order to produce this phenomenon, the light guide plate (10) comes in handy. The light guide plate 110 is made of a high-strength diarrhea force (ac-corrected material, which is not only light in weight but also difficult to break and deformed), and has a characteristic of being transparent. Further, the light guide plate (10) is used for hooking the light source from the light source. (10) The diverging light is applied to the upper surface of the light guide plate 110. When the light source is placed on the side surface of the light guide plate, and the light is emitted from the light source, the surface brightness of the board 110 can be viewed after the backlight unit is to be disassembled and It is uneven, and the light is concentrated on the other end of the light guide plate (4). This is because the light guide plate 110 guides the light emitted by the light source to the other side. Therefore, as shown in Fig. 2B, a convex surface is formed under the light guide plate 11G. The flat portion 113 is designed in such a manner as to maintain a distance from the source H) 5 located on the side surface of the light guide plate 11 such that light is diffused and reflected on the convex flat portion (1). Therefore, the light is evenly distributed from the entire surface of the light guide plate 11 (). Because the protrusion is a patterned design formed by the flat portion U3, the surface light source has a relatively high degree of brightness and the LCD panel of the liquid crystal display also obtains the light of the hook. When the liquid crystal display is manufactured in accordance with the above method, there is still a phenomenon that the intensity of the light is relatively high where the convex flat portion 113 is formed. On the other hand, the intensity of the light is low at the point where the convex flat portion 113 is not formed, meaning that the LCD panel will generate spots. Therefore, the visibility of the LCD panel is also reduced. In particular, when the size of the LCD panel is large, light reaching a region far from the light source 1 () 5 is insufficient. Therefore, the intensity of light in a region far from the light source 105 is low. In order to solve the above problem, in order to increase the uniformity of the light, the diffusion plate 12 and the prism sheet 125 are added to the application. However, the use of the diffusion plate (4) and the prism sheet 125 increases the manufacturing cost of the backlight unit. Therefore, how to obtain a surface light source with high visibility, high brightness and high uniformity on the upper surface of an LCd LCD panel is an important issue to be discussed at present.

TW2554PA 8 1327249 且另一表面形成本體300的外表面。在上表面303形成時，上稜鏡結構31()具有一預定斷面之形狀，用以均勻地衍射、折射及擴散從主體遍射出之光線。多個上稜鏡結構310配置於整個上表面3〇3，且此些上棱鏡結構彼此之間有預定好的間W。更詳細地說，各個上棱鏡結構 31〇沿著箭頭Q的方向延伸（此方向即是光線從光源·射出的方向）且同時/σ著則頭P的方向排列（此方向垂直於箭頭〇的方向）上稜鏡結構3财此之間並非採㈣的方式配置，而是相隔 •預定間距d的距離，此舉乃是為了改善光線的均勾度與可視度。更明確地說，從本體300射出之光線被上棱鏡結構衍射、折射及擴散後，而以於一特定的角度射向液晶顯示器之LCD面板 (未繪示於圖中）’此LCD面板係與導光板相對。且上稜鏡結構 310彼此之間有預定間距d。因此，光線經由預;t間距d所形成的平面（意即上稜鏡結構31G間的空間），逐漸地與液晶顯示器之LCD面板互相垂直，藉此增加到達lcd面板的光線的均勾度。上稜鏡結構310沿著箭頭q的方向延伸，以致於上棱鏡結籲構3H)與形成於下表面的稜鏡部互相垂直，以下將詳細說明。如第3圖所示，上稜鏡結構31Q具有—個三角形的橫斷面形狀，賴此些上稜鏡結構31〇極可能有相#多種不同的橫斷面形其繪示乃上稜鏡結構310 *月同時參考弟4A圖與第4B圖具有不同斷面形狀之透視圖。上稜鏡結構310具有-個梯形的橫斷面形狀，如圖4 示。另一種情況是，上稜鏡結構川具有反向溝槽的橫斷面形狀，此形狀具有-尖端及數個具有1定㈣半徑的側表面，如第4βTW2554PA 8 1327249 and the other surface forms the outer surface of body 300. When the upper surface 303 is formed, the upper crucible structure 31() has a shape of a predetermined cross section for uniformly diffracting, refracting, and diffusing the light radiated from the main body. A plurality of upper structures 310 are disposed over the entire upper surface 3〇3, and the upper prism structures have a predetermined good interval W therebetween. In more detail, each of the upper prism structures 31A extends in the direction of the arrow Q (this direction is the direction in which the light rays are emitted from the light source) and at the same time /σ is arranged in the direction of the head P (this direction is perpendicular to the arrow 〇 Direction) The upper structure is not the configuration of (4), but the distance of the predetermined distance d, which is to improve the uniformity and visibility of the light. More specifically, the light emitted from the body 300 is diffracted, refracted, and diffused by the upper prism structure, and is directed to the LCD panel of the liquid crystal display at a specific angle (not shown). The light guide plate is opposite. And the upper structures 310 have a predetermined spacing d from each other. Therefore, the light is gradually perpendicular to the LCD panel of the liquid crystal display via the plane formed by the pre-t spacing d (that is, the space between the upper structures 31G), thereby increasing the uniformity of the light reaching the lcd panel. The upper crucible structure 310 extends in the direction of the arrow q such that the upper prism junction 3H) is perpendicular to the crotch portion formed on the lower surface, as will be described in detail below. As shown in Fig. 3, the upper jaw structure 31Q has a triangular cross-sectional shape, and the upper jaw structure 31 may have a phase # a variety of different cross-sectional shapes. Structure 310 * month refers to a perspective view having different cross-sectional shapes of the 4A and 4B drawings. The upper structure 310 has a trapezoidal cross-sectional shape as shown in FIG. In another case, the upper crucible structure has a cross-sectional shape of a reverse groove having a tip end and a plurality of side surfaces having a radius of 1 (four), such as the 4th β

TW2554PA 11 1327249 圖所示。在各個上棱鏡結構3 1 〇的橫斷面為梯形時，如圖* a所示，光線會經由梯形之上稜鏡結構310之上部所形成的平面A，逐漸地與液晶顯示器的LCD面板互相垂直。若各個上稜鏡結構310具有反向溝槽的橫斷面形狀時，如圖 2所示，另外，各個上棱鏡結構310之各侧表面的預定曲率半控較佳的是0.01公釐（mm )至1.0公釐。上稜鏡結構310係會形成於鄰近LCD面板之上表面3〇3的 _ 一側部或另一側部。上稜鏡結構310所佔據的面積及上稜鏡結構31〇於本體3〇〇的上表面303之間空間所佔據之面積的比率，較佳的是^ : 1至 0.1 : 1 〇假如上述之上稜鏡結構310所佔據面積及上稜鏡結構310 之間空間所侣據面積之比率超過i ’則光線的衍射及反射效應較低’亮度也會跟著降低。 ^同時，各個上稜鏡結構310之高度h2及底部寬度w2之比率，較佳的是0.3至〇·5，如第3圖及第4A〜4B圖所示。若各個 •上稜鏡結構310之高度h2及底部寬度w2的比率小於〇 3，則水平視角會不必要地增加，因此亮度會減少。另外，若各個上棱鏡結構310之高度h2及底部寬度w2的比率超過〇5，則水平視角會不必要地減少，因此無法滿足光學特性。請再參考第3圖，本體300在其下表面3〇5具有點狀物件，此些物件係直向與橫向排列，使得點狀物件彼此間隔一預定間距。在下文中點狀物件定義為網點稜鏡32〇。請參照第5圖，其繪示乃依照第3圖之網點稜鏡32〇的放大剖面圖。TW2554PA 11 1327249 Figure shows. When the cross section of each of the upper prism structures 3 1 为 is trapezoidal, as shown in FIG. 4 a, the light will gradually cross the LCD panel of the liquid crystal display via the plane A formed by the upper portion of the trapezoidal structure 310. vertical. If each of the upper structures 310 has a cross-sectional shape of the reverse groove, as shown in FIG. 2, in addition, the predetermined curvature half of each side surface of each of the upper prism structures 310 is preferably 0.01 mm (mm). ) to 1.0 mm. The upper structure 310 is formed on a side or the other side adjacent to the upper surface 3〇3 of the LCD panel. The ratio of the area occupied by the upper crucible structure 310 and the area occupied by the space between the upper crucible structure 31 and the upper surface 303 of the body 3〇〇 is preferably ^: 1 to 0.1: 1 〇 if the above The ratio of the area occupied by the upper structure 310 and the area of the space between the upper structures 310 exceeds i', and the diffraction and reflection effects of the light are lower, and the brightness is also lowered. At the same time, the ratio of the height h2 and the bottom width w2 of each of the upper structures 310 is preferably 0.3 to 〇·5, as shown in Fig. 3 and Figs. 4A to 4B. If the ratio of the height h2 and the bottom width w2 of each of the upper structures 310 is smaller than 〇 3, the horizontal viewing angle is unnecessarily increased, so the brightness is reduced. Further, if the ratio of the height h2 and the bottom width w2 of each of the upper prism structures 310 exceeds 〇5, the horizontal viewing angle is unnecessarily reduced, and thus the optical characteristics cannot be satisfied. Referring again to Fig. 3, the body 300 has dot members on its lower surface 3〇5 which are arranged in a straight and lateral direction such that the dot members are spaced apart from each other by a predetermined distance. In the following, the dot member is defined as a dot 稜鏡 32 〇. Please refer to Fig. 5, which is an enlarged cross-sectional view of the dot 稜鏡 32〇 according to Fig. 3.

TW2554PA 12 U27249 =)為4U.5公髮、以及厚度⑺為1〇〇公髮，每個網點棱鏡軸為0.3公釐，短軸為〇.2公羞。因此擴圓形的網點棱鏡排列在與光源平行之G62公料間隔及與光源垂km公愛的間隔之間。同樣地，鄰近光源之網點稜鏡之長軸為Q 3公董，而位於導光板中央’同時也是離光源最遠的網點棱鏡的長軸係為〇.5公釐。在各個網點稜鏡形成時，稜鏡部具有一高度％微米， —底部寬度50微米’及—内角82 5度。另外，上稜鏡結構之高度為13微米，底部寬度為32微米，形成於導光板的整個上表面且彼此之間無互相隔開。實驗例子3 網點稜鏡之大小未改變’上稜鏡結構具有一個三角形，形成於導光板的整個上表面，所以上棱鏡結構彼此間隔―預定間距。在導光板的下端部份，形成橢圓形的網點棱鏡。導光板的寬度 (W)為332.5公釐、長度（L)為411 5公釐、以及厚度（τ) 為10.0公釐，每個網點稜鏡的長軸為〇 3公釐，短軸為〇 2公釐，因此橢圓形的網點稜鏡排列在與光源平行之〇 62公釐的間隔及 '、光源垂直之1.08公餐的間隔之間。在各個網點棱鏡形成時，棱鏡部具有一高度30微米，一底部寬度5〇微米，及一内角82 5 度另外’上稜鏡結構之高度為13微米，底部寬度為64微来，形成於導光板的整個上表面且彼此之間無互相隔開。實驗例子4 ，依照本發明改變網點稜鏡之大小，上稜鏡結構具有一個三角 $ I成於導光板的整個上表面，所以上棱鏡結構彼此間隔一預足間距。在導光板的下端部份，形成橢圓形的網_鏡。導光板TW2554PA 12 U27249 =) is 4U.5 liters, and thickness (7) is 1 〇〇 ,, each prism point is 0.3 mm, and the short axis is 〇.2 羞. Therefore, the rounded dot prism is arranged between the G62 material spacing parallel to the light source and the interval between the source and the source. Similarly, the long axis of the dot 稜鏡 adjacent to the light source is Q 3 gong, and the long axis of the dot prism located at the center of the light guide plate and which is the farthest from the light source is 〇 5 mm. When each dot is formed, the crotch has a height of a micrometer, a bottom width of 50 micrometers, and an inner angle of 82 degrees. Further, the upper crucible structure has a height of 13 μm and a bottom width of 32 μm, and is formed on the entire upper surface of the light guide plate without being spaced apart from each other. Experimental Example 3 The size of the dot is not changed. The upper structure has a triangle formed on the entire upper surface of the light guide plate, so the upper prism structures are spaced apart from each other by a predetermined pitch. At the lower end portion of the light guide plate, an elliptical dot prism is formed. The width (W) of the light guide plate is 332.5 mm, the length (L) is 411 5 mm, and the thickness (τ) is 10.0 mm. The long axis of each dot is 〇3 mm, and the short axis is 〇. 2 mm, so the elliptical dot dots are arranged at an interval of 62 mm parallel to the light source and between the intervals of 1.08 metric meals perpendicular to the light source. When the prisms of each dot are formed, the prism portion has a height of 30 μm, a bottom width of 5 μm, and an internal angle of 82 5 degrees. The height of the upper structure is 13 μm, and the bottom width is 64 μm. The entire upper surface of the light panel is not spaced apart from each other. Experimental Example 4, according to the present invention, the size of the dot is changed. The upper structure has a triangle $I formed on the entire upper surface of the light guide plate, so that the upper prism structures are spaced apart from each other by a predetermined distance. At the lower end portion of the light guide plate, an elliptical mesh mirror is formed. Light guide

TW2554PA 17 =度二I:為332.5公羞、長度⑴為411·5公釐、以及厚度為10.0公爱，每個網點稜鏡的長軸為〇 3公爱公爱’因此橢圓形的網點稜鏡排列在與光源平行之〇 62 ’的門隔及與光源垂直之公爱的間 θTW2554PA 17 = degree II I: 332.5 male shy, length (1) is 411·5 mm, and thickness is 10.0 gongs, the long axis of each dot is 〇3 public love gong' so the elliptical dot rib The mirror is arranged between the gate of the 〇62' parallel to the light source and the symmetry of the symmetry perpendicular to the light source.

Et祆浐·> R k U樣地’鄰近光源之網 ^兄之長軸為〇.3公|，而位於導光板中央，㈣最遠的網點稜鏡的長轴传A 〇 s八卷先'原卿邱Μ 在各個網點稜鏡形成時，棱鏡料有—南度3()微米，—底«度50«，及„ 5 度。另外’上稜鏡結構具有—個三輯面形狀，其Et祆浐·> R k U-like 'the source of the neighboring light source ^ brother's long axis is 〇.3 gong|, and located in the center of the light guide plate, (4) the farthest dot point 稜鏡 long axis pass A 〇 s eight volumes First, 'Qingqing Qiuyi' When the various points are formed, the prism material has - south degree 3 () micron, - bottom «degree 50 «, and „ 5 degrees. In addition, the upper structure has a three-face shape. ,its

米、底部寬度為64微米（間隔距離為為 # 、门細距離為32微未）且形成於導光板 I上衣面。實驗例子5 構Π本發明改變網點稜鏡之Α小’反向溝槽形狀的上稜鏡結導光板及數個預定曲率半徑的側表面，此側表面形成於、面，所以上稜鏡結構彼此間隔一預定間距。在導朵板的下端部份，形成橢圓形的網點稜鏡。導光板的寬度（w)為 = 2.5—么Μ、長度⑴為411 5公着以及厚度（丁）為1〇〇公 _ 母個網點棱鏡的長轴$ 0.3公爱，短軸為0.2公爱，因此搞圓形的網點稜鏡排列在與光源平行之〇 62公爱的間隔及與光源垂直之1.08公复的間隔之間。同樣地，鄰近光源之網點棱鏡之長軸為〇’3公釐’而位於導光板中央’同時也是離光源最遠的網點稜的長軸係為〇.5公釐。在各個網點稜鏡形成時稜鏡部具 -高度30微米，一底部寬度5〇微米，及一内角82 5度。另；，反向溝槽$狀的上稜鏡結構，具有—尖端及數個預定曲率直捏的側表面，其南度為13微米及底部寬度為64微米（間隔距離為 32μπ〇且形成於導光板之上表面。 ’The width of the meter and the bottom is 64 μm (the distance between the door is # and the door is 32 μm) and is formed on the upper surface of the light guide plate 1. EXPERIMENTAL EXAMPLE 5 The present invention changes the upper 稜鏡 junction light guide plate of the 'reverse groove shape' and the side surfaces of a predetermined radius of curvature, which are formed on the surface, so the upper structure They are spaced apart from each other by a predetermined distance. At the lower end portion of the guide plate, an elliptical dot is formed. The width (w) of the light guide plate is = 2.5 - Μ, the length (1) is 411 5 common, and the thickness (D) is 1 〇〇 _ the long axis of the parent dot prism is 0.3 0.3 gong, the short axis is 0.2 gong Therefore, the circular dot is arranged between the interval of 62 angstroms parallel to the light source and the interval of 1.08 gongs perpendicular to the light source. Similarly, the long axis of the dot prism adjacent to the light source is 〇'3 mm' and is located at the center of the light guide plate while being the farthest from the light source, the long axis of the dot is 〇5 mm. At each of the dots, the crotch has a height of 30 microns, a bottom width of 5 microns, and an internal angle of 82 degrees. In addition, the reverse groove-shaped upper crucible structure has a tip end and a plurality of side surfaces of a predetermined curvature, and has a south side of 13 μm and a bottom width of 64 μm (the separation distance is 32 μπ〇 and is formed in The upper surface of the light guide plate. '

TW2554PA 18 1327249 實驗例子之樣本係使用亮度測量儀器以燭光/平方公尺 (cd/m2)所測量。從背光單元的出光面選出乃個點並測量所$ 的點之亮度值。隨後，從已測量之亮度數值計算亮度之均勻^ 小數值/最大數值xlOO)。又更進一步地說，可視度之觀察係由一人測量並觀察是否別亮或特別暗的點。表格1中列出了依照上述之實驗例子條件所測量的亮度、均勻度及可視度之結果。如表格丨所示，亮度及可視度在實驗例子 1至4中表現良好。然而，一些小點在實驗例子丨中被觀察到，因此可視度表現不佳。在實驗例子2至4中’只有觀察到幾個小點’因此可視度表現出色。在實驗例子5的例子中，從另一方面來說，亮度及均勻表現良好，且平面光線具有很好的可視度，且不具任何點狀的亮點。亮度、均勻度及可視度在網點稜鏡和稜鏡部的形狀、排列圖樣皆改變的條件下所測量之結果，顯示在表格丨中。表格1 亮度（cd/m2) 實驗例子1 3500 〜4000 實驗例子2 實驗例子3 實驗例子4 實驗例子5 5200 〜5500 3500〜4000 5200〜5500 5200〜5500 均勻度（％) 55 80 58 84 91 可視度出現一些小點（需再改進）優良優良優良未出現小點 (非常好）當使用上述之導光板3〇 (如圖3所示），則不論使用或不使用傳統液晶螢幕背光單元中的擴散板及稜鏡片，皆會得到相同的结果。也就是說’可藉由依照本發明所提供的光源及導光板而獲TW2554PA 18 1327249 The sample of the experimental example was measured in candle light per square meter (cd/m2) using a brightness measuring instrument. Select a point from the light exit surface of the backlight unit and measure the brightness value of the point of $. Subsequently, the uniformity of the brightness / the maximum value xlOO) is calculated from the measured brightness value. Still further, the observation of visibility is measured by one person and observed for points that are not bright or particularly dark. Table 1 lists the results of brightness, uniformity, and visibility measured according to the experimental example conditions above. As shown in the table, the brightness and visibility performed well in Experimental Examples 1 to 4. However, some small points were observed in the experimental examples, so the visibility did not perform well. In Experimental Examples 2 to 4, 'only a few small points were observed' and the visibility was excellent. In the example of Experimental Example 5, on the other hand, the brightness and uniformity were good, and the plane light had good visibility without any point-like bright spots. The results of brightness, uniformity, and visibility measured under conditions in which the shape and arrangement of the dots and crotch are changed are displayed in the table. Table 1 Brightness (cd/m2) Experimental Example 1 3500 to 4000 Experimental Example 2 Experimental Example 3 Experimental Example 4 Experimental Example 5 5200 to 5500 3500 to 4000 5200 to 5500 5200 to 5500 Uniformity (%) 55 80 58 84 91 Visibility Some small dots appear (need to be improved) Excellent, excellent, excellent, no small dots (very good) When using the above-mentioned light guide plate 3 (as shown in Figure 3), with or without the diffusion in the conventional LCD backlight unit Both the plate and the bracts will give the same result. That is, ' can be obtained by the light source and the light guide plate provided in accordance with the present invention.

TW2554PA 19 1327249 得具有出色亮度、均勻度及可視度的平面光。由以上所述可知，當使用依照本發明之液晶顯示器背光單元的導光板及應用此導光板的液晶顯示器背光單元時，由光源所發散出之光線係以一預定之角度均勻地衍射及擴散到液晶顯示器之LCD面板，且光線逐漸垂直射入液晶顯示器之LCD面板。因此，本發明具有以出色的亮度、均勻度及可視度照亮整個液晶顯不益之功效。另外也證明了可生產出不具有擴散板及/或稜鏡片之液晶顯示器背光單元。紅上所述，雖然本發明已以一較佳實施例揭露如上，然其並非用以限定本發明。本發明所屬技術領域中任何具有通常知識者，在不脫離本發明之精神和範圍内，當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中請專利範圍所界定王TW2554PA 19 1327249 Plane light with excellent brightness, uniformity and visibility. As can be seen from the above, when the light guide plate of the liquid crystal display backlight unit and the liquid crystal display backlight unit using the light guide plate according to the present invention are used, the light emitted by the light source is uniformly diffracted and diffused at a predetermined angle to The LCD panel of the liquid crystal display, and the light gradually enters the LCD panel of the liquid crystal display. Therefore, the present invention has the effect of illuminating the entire liquid crystal with excellent brightness, uniformity, and visibility. It has also been demonstrated that a liquid crystal display backlight unit without a diffusion plate and/or a ruthenium can be produced. The invention has been described above in terms of a preferred embodiment, and is not intended to limit the invention. Any changes and modifications may be made without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention is defined as the king of the patent scope

TW2554PA 20 1327249 【圖式簡單說明】第1圖繪示乃傳統液晶顯示器之背光單元的***圖；二2A圖及第迚圖繪示乃光線經由光源發散至導光板的放大曲圖； -第3圖繪示乃依照本發明之較佳實施例之液晶顯示器背光單几中的導光板之透視圖；第4Α圖及第4Β圖繪示乃上稜鏡結構具有不同斷面形狀之透視圖；第5圖繪示乃依照本發明之網點棱鏡之放大剖面圖；第6Α〜6D圖繪示乃依照本發明之不同形狀之網點稜鏡的示意圖；以及第7Α〜7C圖繪示乃依照本發明之用於液晶顯示器背光單元之導光板上之網點稜鏡之排列平面圖。主要元件符號說明 10 ：背光單元 30 ：導光板 100 :LCD面板 105 :光源 110 :導光板 115 :反射板 120 :擴散板 125 :稜鏡片 130 :保護片 300 :本體 301 :側表面TW2554PA 20 1327249 [Simplified Schematic] FIG. 1 is an exploded view of a backlight unit of a conventional liquid crystal display; FIG. 2A and FIG. 2 are enlarged views of light emitted from a light source to a light guide plate; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 is a perspective view of a light guide plate in a backlight of a liquid crystal display according to a preferred embodiment of the present invention; FIG. 4 and FIG. 4 are perspective views of the upper structure having different cross-sectional shapes; 5 is an enlarged cross-sectional view of a dot prism according to the present invention; FIGS. 6 to 6D are schematic views showing dots of different shapes according to the present invention; and FIGS. 7 to 7C are drawn according to the present invention. An arrangement plan view of the dots on the light guide plate of the backlight unit of the liquid crystal display. Main component symbol description 10 : Backlight unit 30 : Light guide plate 100 : LCD panel 105 : Light source 110 : Light guide plate 115 : Reflector 120 : Diffuser plate 125 : Foil 130 : Protective sheet 300 : Body 301 : Side surface

TW2554PA 21 1327249 303 : 305 ： 306 ： 310 ： 320 ： 322 325 上表面下表面光源上棱鏡結構網點棱鏡棱鏡部第二網點稜鏡TW2554PA 21 1327249 303 : 305 : 306 : 310 : 320 : 322 325 Upper surface Lower surface Light source Upper prism structure Dotted prism Prism section Second dot 稜鏡

TW2554PATW2554PA

Claims

1327249 - 十、申請專利範圍： 99年 1.4日修(更}正本 1. 一種液晶顯示器背光單元之導光板，包括：一本體，具有相對之二第一側表面、一上表面及一下表面，該上表面及該下表面連接至該二第一側表面，該二第一側表面用以供光線射入，該上表面及該下表面用以供光線射出；複數個上稜鏡結構，配置於該本體之該上表面，並具有一預定斷面形狀，其中該些上稜鏡結構彼此間隔一預定間距，以致於該些上稜鏡結構之間具有複數個平面；以及複數個第一網點稜鏡，係直向與橫向配置於該本體之該下表面，以致於該些第一網點稜鏡彼此間隔一間距，各該第一網點棱鏡於表面上提供複數個具有一預定斷面形狀之第一稜鏡部該些第一網點稜鏡排列成圖樣，該些第一網點稜鏡之尺寸係根據該些第網點稜鏡與光線射入之該二第一側表面之一的距離越遠而逐漸增加。 2. 如申請專利範圍第1項所述之導光板，其中當光線射入該二第一側表面時，該些第一網點稜鏡排列成圖樣，該些第一網點稜鏡之尺寸從該二第一側表面往中央逐漸增加。 3. 如申請專利範圍第丨項所述之導光板，其中當光線射入該二側表面之一時，該些第一網點稜鏡排列成圖樣，該些第一網點稜鏡之尺寸從光線射入之一第一側表面往另一第一側表面逐漸增加。 4. 如申請專利範圍第1項至第3項中任一項所述之導光 .板，其中該些第一網點稜鏡設置於該導光板之該下表面上，以z 字形方式直向與橫向排列，該些第一網點稜鏡之奇數排不與該些第一網點稜鏡之偶數排相互重疊。 _ 5. 如申請專利範圍第1項所述之導光板，其中各該上稜鏡 23 1327249 1構更，有-橫斷面形狀，該橫斷面形狀係選自—三角形橫斷面形狀梯％橫斷面形狀及—反向溝㈣斷面形狀所組成之群組中任該反向溝槽斷面形狀係具有一尖端及複數個具有一預定曲率半徑之第二側表面。有預疋 6·如申請專利範圍第i項所述之導光板，其中形成於各該網點稜鏡之表面的第—稜鏡部垂直於該些上稜鏡結構。 7. 如申請專利範圍帛！項所述之導光板，其中該些形成於該些第-網點稜鏡之表面的第一棱鏡部之延長方向與一光源所射出之光線的方向垂直。 8. 如申凊專利範圍第丨項所述之導光板更包括：複數個第二網點稜鏡，配置於該本體之該下表面上該些第一網點稜鏡之_”，並具有—預定雜，其巾，各該第二網點稜鏡之表面具有複數個第二稜鏡部，各該第二網點稜鏡之該些第 -稜鏡部所延伸之方向，與該些形成於各該第__稜鏡上之該些稜鏡部之方向不平行。 9. 如申請專利範圍第1項所述之導光板，其中該些第一網點稜鏡為-圓形、一橢圓形、一菱形、一三角形或以上三者所社合之形狀。 σ 10. 如申請專利範圍第1項所述之導光板，其中各該形成於各該第一網點稜鏡之表面之稜鏡部具有一三角橫斷面形狀三角丰只斷面形狀具有一 75至90度之内角。 11. 如申請專利範圍第丨項或第9項所述之導光板其中當該些第一網點棱鏡以該橢圓形形成時，該橢圓形之一短軸與一長軸之比率為0.5至〇.9。 ' 如申請專利範圍第1項或第5項所述之導光板，其中各該上稜鏡結構具有該反向溝槽之橫斷面形狀，該反向溝槽之橫斷 24 13272491327249 - X. Patent application scope: 99 years 1.4 days repair (more) original 1. A light guide plate of a liquid crystal display backlight unit, comprising: a body having opposite first side surfaces, an upper surface and a lower surface, The upper surface and the lower surface are connected to the two first side surfaces, the two first side surfaces are for light to be incident, and the upper surface and the lower surface are for emitting light; the plurality of upper structures are disposed on The upper surface of the body has a predetermined cross-sectional shape, wherein the upper crucible structures are spaced apart from each other by a predetermined distance such that a plurality of planes are formed between the upper crucible structures; and a plurality of first lattice points The mirror is disposed in a straight direction and a lateral direction on the lower surface of the body such that the first dot points are spaced apart from each other by a distance, and each of the first dot prisms provides a plurality of surfaces having a predetermined sectional shape on the surface. The first mesh dots are arranged in a pattern, and the first mesh dots are dimensioned according to the distance between the first mesh dots and one of the two first side surfaces into which the light is incident. 2. The light guide plate according to claim 1, wherein when the light is incident on the first side surface, the first mesh dots are arranged in a pattern, and the first mesh dots are arranged. The size of the first light guide plate is increased from the first side surface to the center. The first light guide plate is arranged when the light is incident on one of the two side surfaces. In the pattern, the size of the first dot is gradually increased from one of the first side surfaces to the other side of the first side surface. 4. The method according to any one of claims 1 to 3. a light guide plate, wherein the first mesh dots are disposed on the lower surface of the light guide plate, and are arranged in a zigzag manner in a zigzag manner, and the odd rows of the first mesh dots are not related to the first The even rows of one dot are overlapped each other. _ 5. The light guide plate according to claim 1, wherein each of the upper jaws 23 1327249 1 is configured to have a cross-sectional shape, the cross-sectional shape Selected from - triangular cross-sectional shape ladder % cross-sectional shape and - Any of the groups of the reverse groove (four) cross-sectional shape of the reverse groove has a tip end and a plurality of second side surfaces having a predetermined radius of curvature. The light guide plate of item i, wherein the first portion formed on the surface of each of the mesh points is perpendicular to the upper structure. 7. The light guide plate according to the scope of the patent application, wherein The direction of the extension of the first prism portion formed on the surface of the first-mesh point 垂直 is perpendicular to the direction of the light emitted by the light source. 8. The light guide plate according to the above-mentioned claim is further included: a second dot 稜鏡 disposed on the lower surface of the body, the first dot 稜鏡 ””, and having a predetermined impurity, the towel, each surface of the second dot 具有 has a plurality of second In the crotch portion, the direction in which the first crotch portions of each of the second halftone dots extend is not parallel to the directions of the crotch portions formed on the respective __ 稜鏡. 9. The light guide plate of claim 1, wherein the first mesh points are in the shape of a circle, an ellipse, a diamond, a triangle or the like. The light guide plate of claim 1, wherein each of the crotch portions formed on the surface of each of the first halftone points has a triangular cross-sectional shape, and the triangular cross-sectional shape has a 75. Within 90 degrees of the inside angle. 11. The light guide plate according to claim 9 or 9, wherein when the first dot prisms are formed in the elliptical shape, a ratio of one of the short axes to the long axis of the ellipse is 0.5 to 〇 .9. The light guide plate of claim 1 or 5, wherein each of the upper jaw structures has a cross-sectional shape of the reverse groove, and the reverse groove is transected 24 1327249

面形狀具有該尖端及該些具有該預定曲率半徑之第二侧表面該預定曲率半徑為〇.〇1至1.0公羞。 13.如申請專利範圍第μ所述之導光板，其中該些上種鏡結構所佔據的面積與該些上稜鏡結構之間的空隙於該本體之該上表面之間所佔據之面積的比率為i : 1至〇丨：i ^ 14·如申請專利第i項所述之㈣板，其中各該形成於該本體之該下表面之各該第—網點稜鏡上的稜鏡部部寬度的比率為0.5至〇.7β 又八抵 15.如申請專利範圍第丨項所述之導光板，其中各之該上表面之上稜鏡結構的高度與底部寬度之比‘為〇 3 稜鏡形成合之形狀角形或以上四者所結丫明寻刊範圍第圓形、一橢圓形 7 〜寸儿取一菱形、一 17. 一種液晶顯示器背光單元，包括：一光源；以及如申凊專利範圍第1項所述之導光板。 25 1327249 ! 瓦&日修(更)正替換賀j TW2554PA 專利申請案號第094135280號修正 L L ••I······· •❿······ ······· ❿···· ·€0) ···············砸參❿·····SThe face shape has the tip end and the second side surface having the predetermined radius of curvature, the predetermined radius of curvature being 〇.1 to 1.0. 13. The light guide plate of claim [51], wherein an area occupied by the upper mirror structures and an area occupied by the gap between the upper jaw structures between the upper surface of the body The ratio is i: 1 to 〇丨: i ^ 14 · (4) as described in claim i, wherein each of the first portion of the lower surface of the body is formed on the first portion The ratio of the width is 0.5 to 7.7β and 8.5. The light guide plate according to the above-mentioned claim, wherein the ratio of the height of the 稜鏡 structure to the width of the bottom on each of the upper surfaces is 〇3 棱The shape of the mirror is formed by the shape of the angle or the shape of the above four. The circle is rounded, and the ellipse is 7-inch. A diamond-shaped backlight unit comprises: a light source backlight unit, including: a light source; The light guide plate described in the first item of the patent scope. 25 1327249 ! 瓦 & 日修 (more) is replacing He j TW2554PA Patent Application No. 094135280 Revision LL ••I································ ❿···· ·€0) ·········································

圖 7A 第 ••參參籲⑩⑩鲁一 ⑩參⑩···· Ρ®ΦΙΙ)Β)ΦΦΦΙ __娜€1砸®«« ❿❿修鲁雜❿·Figure 7A • • • Participation in 1010 Lu 1 10 10 10···· Ρ®ΦΙΙ)Β)ΦΦΦΙ __娜€1砸®«« ❿❿修鲁杂❿·

第7Β圖 L 1327249 丨⑽年L %日徬(更)乒:線Μ TW2554PA 專利申請案號第094135280號修正 20 L ui '够参·.i參鲁 ·:2·:< • ®€B)»€I])i»Page 7 L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L )»€I])i»

"mm%rrz參 ❿馨馨鲁參響鲁 L 7C 第"mm%rrz ❿ ❿ Xinxin Lu Shen Lu Lu L 7C