200918973 九、發明說明： 【發明所屬之技術領域】 本發明係有關一種供液晶顯示裝置背光單元用之導光板。更明 5確而言，本發明係關於一種供液晶顯示裝置背光單元用之楔型 導光板，其具有使用複數個稜鏡形成的一後表面，每個稜鏡具 有不對稱的一三角形截面，以致於可增加垂直半視角及改良光 學特性。 10 【先前技術】 大體上，一液晶顯示（以下簡稱為一「LCD」）裝置係視為經由將 電場應用至兩玻璃基板間配置的液晶以顯示數字或影像之裝 置，其中該等液晶是由在液體與固體間具有一中間相位的材料 製成。 15 既然LCD裝置不是一自發光裝置，所以它必須具有如同一光源 的背光單元以產生光。一影像係以從背光單元所產生光傳遞是 在一液晶面板中調整的方式而顯示，其中液晶是均勻地被安置。 20根據一發光之光源位置，一 LCD背光單元係分類成一直接型背 光單元，其中光源係直接配置在一 LCD液晶面板的的後侧；與 一側光式背光單元，其中光源係配置在一 LCD液晶面板的一 200918973 側 型背:=一光=先=光式背光單元可次分類成-楔 圖9係描述使用-楔型導光板的—傳統背光單元結構圖。 -光源2最初在LCD裝置中是用來發光。軸可使用各種類型 光源，但是LCD裝置通常採用一冷陰極螢光燈$(^1^)，其具有 低功率消耗，並可發出高度明亮白光。 … 1〇 一導光板4是在一 LCD面板下面提供，且在光源2的一側，並 用來將從光源2產生的聚光轉換成平面光，如此將平面光投射 至LCD面板。 一反射板3是在導光板4的一後側上提供，並用來將從光源2 15的發光反射至在反射板3的前端所配置的lcd面板。 該擴散片5是在導光板4的前端提供，並用來使光均勻通過導 光板4。 2〇雖然光通過擴散片5,但是光的擴散是以水平與垂直方向發生， 所以亮度會快速衰減。關於這一點，稜鏡片6是用來反射及集 中光，藉此提昇亮度。 200918973 了保護片7是在稜鏡片6上面提供，並用來避免稜鏡片6到傷， 並田在水平與垂直方向中使用兩層配置的稜鏡片6時，可避免 莫知；（波紋)效應(Moire effect)發生。 背光單元 背光單元進-步包括：—模框(機殼），其係當作一外殼使用，以 允許固定背光單元的各個組件，所以可整合背光單元；及—燈 蓋（背蓋）’以保護背光單元，而用來維持背光單元的強度及支撐 10如圖9所示，光源2通常是位在背光單元的一邊緣(對於—lcd 電視而言，光源時常係直接位在一面板的後侧）。結果，光不會 =勻傳輸通過背光單元的整個表面，所以背光單元的邊緣會比曰 背光單元的任何其他部位更明亮。為了要避免此現象，可使用 導光板4。導光板通常是由一透明丙烯樹脂製成，由於它的高強 15度，所以不易破裂，且擁有防變形、重量輕與可見光高傳輪。 換句話說，導光板4是用來允許來自光源2的發光均勻地投射 至導光板板4的整個表面。實際上，然而，在背光單元拆卸及 允許從位在導光板4一側的光源2發光的情況中，光不會均勻 2〇权射至導光板4的整個表面，而是集中在導光板4的兩側。這 疋因為導光板4將來自光源2的光導向導光板4的相對端。 因此，導光板4的後表面係受制於一特定處理，以使在導光板4 的光散射反射，以致於光可經由導光板4的整個表面傳輪。明 200918973 確地’導光板4的後表面係使用一突出（pr〇mjnence)/凹陷 (depression)圖案形成，其在與光源2的距離等的考慮設計上具 有一預定形狀。當突出/凹陷圖案是在導光板4的後表面上形成 時，具有較高亮度與均勻性的平面光係經由LCD裝置導光板的 5 整個表面發出。 然而，在如上述構成的傳統LCD裝置中，具有在其下方形成突 出/凹陷圖案的面板部分則看似明亮’且在其下方沒有突出/凹陷 圖案的面板其他部分看似黑暗’所以聚光現象會在面板上發 1〇生’藉使LCD裝置的能見度惡化。尤其，當LCD面板尺寸增 加時，遠離光源2較遠的一區域2缺乏絕對光量到達，所以看 似黑暗。 此外’擴散片與稜鏡片係用於改良光均勻性，並造成增加背光 I5單元的製造成本。 為了要解決上述問題，需要有更多的研究，在不使用擴散片或 稜鏡片而可獲得在LCD面板的整個表面上具有良好能見度、高 亮度、與良好均勻性的平面光。 20 【發明内容】 本發明已解決先前技術之前述問題’且本發明的一態樣係提供 一導光板’以供呈現優越亮度、均勻光及在LCD面板整個表面 上可見的LCD背光單元。 200918973 本發明的另一態樣係提供使用導光板的LCd背光單元。 應該注意’本發明並未侷限於上述態樣，並根據下述，熟諳此 5項技術者應可瞭解本發明的其他目的與特徵。 技術解決方案 根據用於達成上述之本發明態樣，提供用於一液晶顯示的導光 ίο板其包含.光投射之側表面；發光之一前表面，該前表面係 連接至該等側表面；及光反射之一後表面，其中該後表面係此 用包括複數個稜鏡的一後稜鏡部件形成，每個具有垂直於一光 源發光方向的一縱向、與不對稱的一三角形截面。 I5有利功效 根據本發明的液晶顯示裝置的導光板允許均句增加到達液晶顯 不裝置面板整個表面的光量、增加垂直半視角、與改良的亮度。 相較於稜鏡配置在其前表面的一傳統導光板，根據本發明導光 2〇板的亮度與能見度有明顯改良。 口此’根據本發明，既然背光單元可在沒有—或兩個擴散片與 -稜鏡而實現，所以減少背光單元的製造成本是可能的。 200918973 【實施方式】 最佳模態 本發明係針對一液晶顯示裝置的導光板，其包含：光投射於其 上^側表面；—發光前表面，該前表面係連接至該等侧表面； 5及光反射之後表面，其中該後表面係使用包括複數個稜鏡的一 後棱鏡部件所形成，每個具有垂直於一光源發光方向的一縱 向、與不對稱的一三角形截面。 本發明的模態 10本發明現將參考附圖作更詳細描述。 圖1和2係根據本發明的一第一具體實施例，描述當從不同角 度看到的一 LCD背光單元導光板透視圖。 I5本發明的第一具體實施例係針對一楔型導光板，其中一光源L 係位在其一側。導光板通常是由一透明丙烯樹脂製成，具有高 強度、抗破裂與變形、重量輕且可見光。 請即參考圖1，該導光板包含一主體100 ’其包含：光投射於其 20上之側表面102 ; —發光之前表面104，其中該前表面104係連 接至該等側表面102，而面對該LCD裝置的一面板(未在圖顯 示）；及一光反射之後表面106 ’該後表面1〇6係面對該前表面 104。 200918973 不同於字典内的定義 面。因此，在圖1中 兩表面。 側，面102係定義為光投射於其上之表 該等側表面102係视為與光源L相鄰的 r2f，棱每在後表面脳上形成，並包括複數個稜鏡 光源發光方向的—縱向、與不對稱的一三 角开> 截面。 請即參考圖2,該後稜鏡部件u〇係使導光板的前表㈣4亮度 ίο均勻士圖2所示’在-光源L係位在一側的楔型導光板情況 中，^稜鏡部件12〇 ’連同與光投射側表面1〇2的距離增加，增 加其寬度w。寬度增加的理由如下。當與光投射側表面1〇2的 距離增加時，到達的光量會變得較小。關於這—點，既然用來 反射及折射光的稜鏡部件120具有較大的長度，儘管少量的光 Μ到達稜鏡部件120,稜鏡部件120所反射或折射的光量會增加， 所以可改良朝向前表面104發光的均勻性。 如圖2所示’後稜鏡部件120可具有一條紋圖案，連同與光源 的距離一起變化其中的寬度。或者，該後稜鏡部件12〇可具有 20 —點狀圖案。 前表面104係使用由光學構件142所組成的一前透鏡部件mo 形成，每個具有半橢圓形的截面。在每個光學構件142的縱向 -12- 200918973 與每個稜鏡的縱向之間定義的角度最好是在80°至100°的範圍 中，尤其最好是90°。 前透鏡部件140係用來改良光學特性與能見度。最好是該等光 5學構件142之每一者具有1〇皇250微米（Mm)的間距(Pitch)。 一傳統導光板具有一光滑表面，而沒有任何光學構件；或者， 具有一三角形截面的稜鏡。 1〇然而，在傳統導光板中，當從前表面看時，在導光板的後表面 上形成的後稜鏡部件會顯汴出來，而由於在稜鏡的兩表面之間 的干涉條紋，所以會不利地造成能見度惡化及發生Moire波故 效應。 15另一方面，根據本發明的導光板’由光學構件142所組成的前 透鏡部分140(具有半橢圓截面）是在導光板的前表面上提 供，如此便覆蓋該後稜鏡部件120,藉此改良能見度與光學特性。 圖3係沿著圖2線條A-A的截面圖。圖4係沿著圖2線條 2〇 的截面圖。 從圖3顯示垂直於光源縱向的導光板截面看出，該光學構件142 係沿著在前表面上的導光板截面縱向而形成。既然在此使用的 光學構件142是柱狀透鏡(lenticular lenses)，所以每個柱狀透鏡 -13- 200918973 ，柱狀遷 ==:=截面縱向相同。換句話說 ^^122,其具有额表面上配置料對_一：角开 截面，母個稜鏡_向是與光源L的縱向平行。 W 一角形 以= 谈不對稱稜的内角，與光源相 -内角⑷」，且與該光源相對的一内角稱為「一第二内角⑻* J 〇 10 15 第「内角(α)是在70。残、範圍 50。的範圍。既然三角形的有 内角在40至 滿自。㈣、、乾圍。稜鏡的形狀係透過内角範圍而定義，所以增知半 。良的半視肖將在下列參考特定範例描述。 = =Γ^麵嫩域㈣，概板前表面上 而卜料142具有一橢圓形截面，且稜鏡122在導光板的後表 面上疋彼此隔開。 考文鏡122連同與光源的距離的增加而長度增加。 以:’使用根據本發明較佳具體實施例的導光板可改良一些特性，例 ，辟^^能見度將參考下列特定範例說明。雖然未在此 提到’但是麟此項技術者鱗解更乡詳細的範例。 200918973 本發明的伽及效能可從下面的勤得驗證： 範例 1·前光學構件的實驗性與比較性範例 =係根據本發明’描述在供—LCD I置f光單元所用的—導光板 刖面’其上形成—柱狀透鏡形式之每個光件其特定尺 之截面圖。 =的柱狀透鏡在—高度H一間距p、與在兩相鄰透鏡之間的 一角度做改變，並具有—25微米（_)的均勻的曲率半徑。 向度 Η 與間距 p 係使用 Q、2Q、4Q。、6Q。、8〇。、1 QQ。、120。 和140。的各種角度測量。 15 <實驗性範例1> 後奴鏡部件[寬度Wx長度Lx厚度τ=288 8 χ217 7χ2 4(^ 始).x 0.8(結束）氅米（111111)]在一楔型導光板後表面上以稜鏡（高 0度· 14.25微米（μηι);間距：25微米（㈣；及内角：825。）的一 條紋圖案（間距：樣微米（μιη》形成。此外，柱狀透鏡係垂直於 ^源地配置於導光板前表面上，其每個具有25微米（μιη)曲率半 技R 25微米（μιη)尚度、與5〇微米…m)間距、及在相鄰透鏡之 間0°角度之橢圓形截面。 -15· 200918973 〈實驗性範例2至8> 除在導光板的前表面上形成相鄰柱狀透鏡之間的角度是從20。 至140°以20°作變化，且柱狀透鏡的高度與間距係依角度決定 5之外，實驗性範例2至8係使用與實驗性範例1相同的方式執 行。在實驗性範例1至8的柱狀透鏡的特定尺寸是在表1與圖5 中描述。 表1 實驗 實驗 實驗 實驗 實驗 實驗 實驗 實驗 性範 性範 性範 性範 性範 性範 性範 性範 例1 例2 例3 例4 例5 例6 例7 例8 曲率半 25. 0 微 25.0 微 25.0 微 25.0 微 25.0 微 25.0 微 25.0 微 25.0 微 徑 米 米（μπι) 米（μιη) 米（μπι) 米（μπι) 米（μπι) 米（μπι) 米（μπι) (μπι) 透鏡高 25. 0 微 20. 7 微 16. 5 微 12.5 微 8.9 5.9 3.4 1.5 度 米（μπι) 米（μπι) 米（μπι) 米（μπι) 微米 微米 微米 微米 (μπι) (μπι) (μιη) (μιη) 透鏡間 50.0 微 49. 2 微 47. 0 微 43. 3 微 38. 3 微 32.1 微 25.0 微 17.1 微 距 米 米 米 米 米 米 米 米 (μπι) (μπι) (μιη) (μπι) (μιη) (μιη) (μιη) (μιη) 角度 0〇 20。 40。 60。 80。 100° 120° 140° <比較性範例1> -16 - 200918973 一後稜鏡部件[寬度Wx長度Lx厚度t=288.8 x217.7 x2.4〇1 始）X 0.8(結束）毫米（mm)]是在一楔型導光板的後表面上以稜鏡 (南度· 14.25微米（μιη);間距：25微米（μιη);及内角：82 5。） 的一條紋圖案（間距：430微米（μιη))所形成。 5該楔型導光板具有一光滑前表面。 <比較性範例2> 一後稜鏡部件[寬度Wx長度LX厚度τ=288.8 χ217.7χ2·4〇1 始）x 0.8(結束）毫米（mm)]是在一楔型導光板的後表面上以稜鏡 10 (咼度.14.25微米（μηι);間距：25微求（pm);及内角：82.5。） 的一條紋圖案（間距：430微米（μιη))的形成。 此外，稜鏡係垂直於光源地配置在導光板前表面上，其每個具 有一 50微米（μιη)間距、一 25微米（μιη)高度、與90。的相鄰透鏡 15間角度之截面。 2.前光學構件的結果分析 表2 比較 比較 實驗 實驗 實驗 實驗 實驗 實驗 實驗 實驗 性範 性範 性範 性範 性範 性範 性範 性範 性範 性範 例1 例2 例1 例2 例3 例4 例5 例6 例7 例8 頂部 X 稜鏡 柱狀 柱狀 柱狀 柱狀 柱狀 柱狀 柱狀 柱狀 結構 透鏡 透鏡 透鏡 透鏡 透鏡 " 1 1 .J 透鏡 L----- 透鏡 -17- 200918973 垂直 亮度 (cd) 224.5 234.93 215.6 199.9 216.4 225.4 241.5 247.1 256.3 256.7 圖案 能見 度 1 1 4 4 4 3 3 3 2 2 透鏡 南度 /透 鏡間 距 0.5 0.42 0.35 0.29 0.23 0.18 0.16 0.09 圖案能見度等級：優良(5)>很好(4)>好(3)>尚可(2)>差 表2顯示實驗性範例1至8盥比較性銘彳 ^ ^ / 靶例1和2的結果。圖 -根據本發明的實驗性與比較性範例顯示亮度圖。 從=和圖6看出’在透鏡高度與透鏡間距比小於㈣之條件 下旎壬現兩中心亮度；且相較於比較 , ” 顯示優良圖案能見度。同時可確定實驗性範例 例之間的阁奩此目步鱼古危士 ^田比較貫驗性與比較性範 】之間的圖案此見度與冗度日守，貫驗性範例5和6是最佳。 這些結果確定，最好是在導光板前表 的間距與高度^在1 : (U至丨：g.3範、^光學構件 的乾圍，在相鄰光學構 •18· 200918973 件之間的角度是在60。至120。的範圍，且每個光學構件的曲率 半徑在每個透鏡間距的G.58至1.G倍的範圍。 範例 3.後稜鏡部件之實驗性與比較性 <實驗性範例 後稜鏡#件[寬度Wx長度Lx厚度τ=288.8 x 217.7 x2.4〇1 ==〇.8(結束)毫米(mm⑽在一楔型導光板的後表面上以稜鏡 Γ二微米㈣’間距：25微米(_)，第-内角⑷:，， #Γιιπ1λλ_ ，、弟一内角（冷）：45。）的一條紋圖案（間距：430微 未㈣)所形成。此外，導光板具有-反射鏡前表面。 〈實驗性範例1〇至13〉 除第一内角（α)係以5 性範例9的相同方气執—卜’實驗性範例10至13係使用與實驗 在實驗性範例9至η 表3 的稜鏡特定尺寸是在表3和® 7中描述。 ---- ----— -η 實驗性範 90。 ----- 實驗性範 —- --- 第一内角 實驗性範 一例11 實驗性範 例12 實驗性範 例13 (a) 85。 80。 75。 70。 中間角 -—- --~~~---- ----〜—I _ 45。 45。 45。 •19- 200918973 (Θ) 第二内角 (/5) 45。 50。 55。 60。 65。 棱鏡高度 25. 0微米 (μπι) 23. 0微米 (μπι) 21. 2微米 (μπι) 19. 7微米 (μπι) 18. 3微米 (μπι) 〈比較性範例3> 一後稜鏡部件[寬度W x長度L x厚度T=288. 8 x 217.7 x 2.4(開始) X 0.8(結束）毫米（麵）]係在一楔型導光板的後表面上以稜鏡（高度： •5 14. 25微米（μπι)，間距：25微米(μιη)，内角(α) : 82. 5° )的一條紋 圖案（間距：430微米(μηι))所形成。此外，該導光板具有一反射鏡前 表面。 4.後表面稜鏡的結果分析 比較性範 例3 實驗性範 例9 實驗性範 例10 實驗性範 例11 實驗性範 例12 實驗性範 例13 垂直亮度 217.6 217.5 272.2 256.5 230.0 211.3 (cd) 垂直半視 -9° /+7。 -10。 -10。 -10。 -10。 -10。 角 /+12° /+12° /+12° /+15° /+17° 第一内角 48.75° 90。 85。 80。 75。 70。 (α) 中間角 82.5。 45。 50。 55。 60。 65。 (Θ) -20- 200918973200918973 IX. Description of the Invention: [Technical Field] The present invention relates to a light guide plate for a backlight unit of a liquid crystal display device. More specifically, the present invention relates to a wedge-shaped light guide plate for a backlight unit of a liquid crystal display device, which has a rear surface formed using a plurality of turns, each of which has an asymmetrical triangular cross section. So that the vertical half angle of view and improved optical properties can be increased. 10 [Prior Art] In general, a liquid crystal display (hereinafter referred to as an "LCD") device is regarded as a device for displaying a digital or image by applying an electric field to liquid crystal disposed between two glass substrates, wherein the liquid crystals are Made of a material having an intermediate phase between the liquid and the solid. 15 Since the LCD device is not a self-illuminating device, it must have a backlight unit such as the same light source to generate light. An image is displayed in such a manner that light transmission from the backlight unit is adjusted in a liquid crystal panel in which liquid crystal is uniformly disposed. 20 according to the position of a light source, an LCD backlight unit is classified into a direct type backlight unit, wherein the light source is directly disposed on the rear side of an LCD liquid crystal panel; and the side light type backlight unit, wherein the light source is disposed on an LCD A 200918973 side back of the liquid crystal panel: = one light = first = optical backlight unit can be sub-classified into - wedge Figure 9 is a structure diagram of a conventional backlight unit using a wedge-shaped light guide. - The light source 2 is initially used for illumination in an LCD device. Various types of light sources can be used for the shaft, but LCD devices typically employ a cold cathode fluorescent lamp $(^1^), which has low power consumption and emits highly bright white light. 1 〇 A light guide plate 4 is provided under an LCD panel and on one side of the light source 2, and is used to convert the collected light generated from the light source 2 into planar light, thus projecting the planar light to the LCD panel. A reflecting plate 3 is provided on a rear side of the light guiding plate 4, and serves to reflect the light emission from the light source 2 15 to the lcd panel disposed at the front end of the reflecting plate 3. The diffusion sheet 5 is provided at the front end of the light guide plate 4 and serves to uniformly pass light through the light guide plate 4. 2〇 Although the light passes through the diffusion sheet 5, the light diffusion occurs in the horizontal and vertical directions, so the brightness is rapidly attenuated. In this regard, the cymbal 6 is used to reflect and concentrate light, thereby increasing the brightness. 200918973 The protective sheet 7 is provided on the cymbal 6 and is used to prevent the cymbal 6 from being damaged. When the cymbal 6 of the two-layer configuration is used in the horizontal and vertical directions, it is possible to avoid the knowledge; Moire effect). The backlight unit backlight unit further includes: a mold frame (casing) which is used as a casing to allow the components of the backlight unit to be fixed, so that the backlight unit can be integrated; and the lamp cover (back cover) Protecting the backlight unit to maintain the strength and support of the backlight unit. As shown in FIG. 9, the light source 2 is usually located at one edge of the backlight unit (for an LCD television, the light source is often located directly behind a panel). side). As a result, the light does not pass uniformly through the entire surface of the backlight unit, so the edge of the backlight unit will be brighter than any other portion of the backlight unit. In order to avoid this phenomenon, the light guide plate 4 can be used. The light guide plate is usually made of a transparent acrylic resin, and is not easily broken due to its high strength of 15 degrees, and has anti-deformation, light weight and high visible light transmission wheels. In other words, the light guide plate 4 is for allowing the light from the light source 2 to be uniformly projected onto the entire surface of the light guide plate 4. Actually, however, in the case where the backlight unit is detached and the light source 2 positioned on the side of the light guide plate 4 is allowed to emit light, the light is not uniformly radiated to the entire surface of the light guide plate 4, but concentrated on the light guide plate 4 On both sides. This is because the light guide plate 4 guides the light from the light source 2 to the opposite ends of the light guide plate 4. Therefore, the rear surface of the light guide plate 4 is subjected to a specific process so that light scattered on the light guide plate 4 is reflected so that light can be transmitted through the entire surface of the light guide plate 4. Ming 200918973 It is true that the rear surface of the light guide plate 4 is formed using a pr〇mjnence/depression pattern which has a predetermined shape in consideration of the distance from the light source 2 and the like. When the protruding/recessed pattern is formed on the rear surface of the light guide plate 4, the planar light having higher brightness and uniformity is emitted through the entire surface 5 of the light guide plate of the LCD device. However, in the conventional LCD device constructed as described above, the panel portion having the protruding/recessed pattern formed under it looks like a bright 'and the other portion of the panel having no protruding/recessed pattern underneath appears to be dark', so the condensing phenomenon Will send a message on the panel 'By the visibility of the LCD device deteriorated. In particular, when the size of the LCD panel is increased, a region 2 farther from the light source 2 lacks an absolute amount of light to reach, so it looks dark. In addition, the diffuser and the ruthenium are used to improve light uniformity and to increase the manufacturing cost of the backlight I5 unit. In order to solve the above problems, more research is required to obtain flat light having good visibility, high brightness, and good uniformity over the entire surface of the LCD panel without using a diffusion sheet or a sheet. [Explanation] The present invention has solved the aforementioned problems of the prior art' and an aspect of the present invention provides a light guide plate' for presenting superior brightness, uniform light, and an LCD backlight unit visible on the entire surface of the LCD panel. 200918973 Another aspect of the present invention provides an LCd backlight unit using a light guide plate. It should be noted that the present invention is not limited to the above-described aspects, and other objects and features of the present invention will be apparent to those skilled in the art from the following. Technical Solution According to the aspect of the invention for achieving the above, a light guide for a liquid crystal display includes a side surface of the light projection; a front surface of the light, the front surface being connected to the side surfaces And a rear surface of the light reflection, wherein the rear surface is formed by a backing member comprising a plurality of turns, each having a longitudinal, asymmetrical triangular cross section perpendicular to the direction of illumination of the light source. I5 Advantageous Effects The light guide plate of the liquid crystal display device according to the present invention allows the average to increase the amount of light reaching the entire surface of the liquid crystal display panel, increase the vertical half angle of view, and improve the brightness. The brightness and visibility of the light guiding plate according to the present invention are significantly improved compared to a conventional light guiding plate disposed on the front surface thereof. According to the present invention, since the backlight unit can be realized without-or two diffusion sheets and -, it is possible to reduce the manufacturing cost of the backlight unit. 200918973 [Embodiment] The best mode of the present invention is directed to a light guide plate of a liquid crystal display device, comprising: light projected onto the upper surface thereof; a front surface of the light emitting, the front surface being connected to the side surfaces; And a surface after light reflection, wherein the back surface is formed using a rear prism member including a plurality of turns, each having a longitudinal, asymmetrical triangular cross section perpendicular to the direction of illumination of a light source. Modality of the Invention 10 The invention will now be described in more detail with reference to the accompanying drawings. 1 and 2 are perspective views of an LCD backlight unit light guide plate as seen from different angles, in accordance with a first embodiment of the present invention. I5 The first embodiment of the present invention is directed to a wedge type light guide plate in which a light source L is tied to one side thereof. The light guide plate is usually made of a transparent acrylic resin and has high strength, resistance to cracking and deformation, light weight and visible light. Referring to FIG. 1 , the light guide plate includes a main body 100 ′ which includes: a side surface 102 on which light is projected; 20 a front surface 104 for illuminating, wherein the front surface 104 is connected to the side surfaces 102 , and the surface is A panel (not shown) of the LCD device; and a surface 106' behind the light reflecting surface 〇6 facing the front surface 104. 200918973 is different from the definition surface in the dictionary. Therefore, in Figure 1, the two surfaces. Side, face 102 is defined as a table on which light is projected. The side surfaces 102 are considered to be r2f adjacent to the source L, each edge being formed on the back surface , and including a plurality of illuminating directions of the 稜鏡 source - Longitudinal, with an asymmetrical triangle opening > section. Referring to FIG. 2, the rear cymbal member u 〇 is such that the front surface of the light guide plate (4) 4 brightness ίο uniforms as shown in FIG. 2 in the case of the wedge-shaped light guide plate with the light source L being on one side, ^稜鏡The member 12'' increases in width along with the distance from the light projection side surface 1〇2, increasing its width w. The reason for the increase in width is as follows. When the distance from the light projection side surface 1 〇 2 is increased, the amount of light that arrives becomes smaller. In this regard, since the crucible member 120 for reflecting and refracting light has a large length, although a small amount of pupil reaches the crucible member 120, the amount of light reflected or refracted by the crucible member 120 is increased, so that it can be improved. Uniformity of illumination towards the front surface 104. As shown in Fig. 2, the rear heel member 120 may have a stripe pattern, varying in width along with the distance from the light source. Alternatively, the breech member 12A may have a 20-dot pattern. The front surface 104 is formed using a front lens component mo composed of optical members 142, each having a semi-elliptical cross section. The angle defined between the longitudinal direction -12-200918973 of each optical member 142 and the longitudinal direction of each of the turns is preferably in the range of 80 to 100, particularly preferably 90. Front lens component 140 is used to improve optical properties and visibility. Preferably, each of the optical components 142 has a pitch of 250 micrometers (Mm). A conventional light guide plate has a smooth surface without any optical member; or, has a triangular cross section. 1. However, in the conventional light guide plate, when viewed from the front surface, the breech member formed on the rear surface of the light guide plate is revealed, and due to interference fringes between the two surfaces of the cymbal, Unfavorably causing deterioration of visibility and occurrence of Moire wave effect. On the other hand, the front lens portion 140 (having a semi-elliptical cross section) composed of the optical member 142 according to the present invention is provided on the front surface of the light guide plate so as to cover the rear sill member 120, This improved visibility and optical properties. Figure 3 is a cross-sectional view taken along line A-A of Figure 2. Figure 4 is a cross-sectional view taken along line 2 of Figure 2; As seen from the cross section of the light guide plate perpendicular to the longitudinal direction of the light source, the optical member 142 is formed along the longitudinal direction of the cross section of the light guide plate on the front surface. Since the optical members 142 used herein are lenticular lenses, each of the lenticular lenses -13 - 200918973 has a columnar shift ==: = the cross section is the same in the longitudinal direction. In other words, ^^122, which has a pair of aligning materials on the frontal surface, an angular opening section, and a mother 稜鏡 direction is parallel to the longitudinal direction of the light source L. W corner = = the inner angle of the asymmetrical ridge, the inner angle (4) with the light source, and an inner angle opposite to the light source is called "a second inner angle (8) * J 〇 10 15 "the inner angle (α) is at 70 The range of the residual, range 50. Since the inner angle of the triangle is 40 to full. (4), dry circumference. The shape of the 系 is defined by the inner angle range, so the half is improved. The good half vision will be in the following Referring to the specific example description, ==Γ^面面(4), the front surface of the board has an elliptical cross section, and the crucibles 122 are spaced apart from each other on the rear surface of the light guide plate. The distance of the light source increases and the length increases. By: 'The use of the light guide plate according to the preferred embodiment of the present invention can improve some characteristics. For example, the visibility will be explained with reference to the following specific examples. Although not mentioned here, This technique is based on the following examples: - LCD I used to set up the f-light unit The light guide plate has a cross-sectional view of each of the light members in the form of a cylindrical lens. The lenticular lens is at an angle H between the height H and the angle between the two adjacent lenses. Changed, and has a uniform radius of curvature of -25 micron (_). The angle Η and the spacing p are Q, 2Q, 4Q, 6Q, 8〇, 1 QQ, 120, and 140. Measurements 15 <Experimental Example 1> Rear Mirror Parts [Width Wx Length Lx Thickness τ = 288 8 χ 217 7χ 2 4 (^ Start). x 0.8 (End) 氅米 (111111)] behind a wedge-shaped light guide plate The surface is formed by a stripe pattern of 稜鏡 (higher 0 degrees · 14.25 micrometers (μηι); pitch: 25 micrometers ((four); and inner angle: 825.)): pitch: micron (μιη). In addition, the cylindrical lens system is vertical The source is disposed on the front surface of the light guide plate, each of which has a curvature of 25 micrometers (μιη), a radius of 25 micrometers (μιη), a distance of 5 μm...m), and between adjacent lenses. Angle of elliptical cross section. -15· 200918973 <Experimental Examples 2 to 8> In addition to forming adjacent columns on the front surface of the light guide plate The angle between the lenses is changed from 20 to 140° at 20°, and the height and pitch of the lenticular lens are determined by angle 5, and experimental examples 2 to 8 are used in the same manner as Experimental Example 1. Execution. The specific dimensions of the lenticular lenses in Experimental Examples 1 to 8 are described in Table 1 and Figure 5. Table 1 Experimental Experiments Experimental Experiments Experimental Experiments Experimental Paranormal Paranormal Norm Paranormal Fans Sexual paradigm 1 Case 2 Case 3 Case 4 Case 5 Case 6 Case 7 Case 8 Curvature half 25. 0 micro 25.0 micro 25.0 micro 25.0 micro 25.0 micro 25.0 micro 25.0 micro 25.0 micrometer rice (μπι) rice (μιη) rice (μπι m (μπι) m (μπι) m (μπι) m (μπι) (μπι) lens height 25. 0 micro 20. 7 micro 16. 5 micro 12.5 micro 8.9 5.9 3.4 1.5 degrees m (μπι) m (μπι) m (μπι) m (μπι) micron micron micron (μπι) (μπι) (μιη) (μιη) between lenses 50.0 micro 49. 2 micro 47. 0 micro 43. 3 micro 38. 3 micro 32.1 micro 25.0 micro 17.1 macro米米米米米米米 (μπι) (μπι) (μιη) ( Μπι) (μιη) (μιη) (μιη) (μιη) Angle 0〇 20. 40. 60. 80. 100° 120° 140° <Comparative Example 1> -16 - 200918973 A rear 稜鏡 part [width Wx length Lx thickness t=288.8 x217.7 x2.4〇1 start) X 0.8 (end) mm (mm) ] is a stripe pattern of 稜鏡 (South degree 14.25 μm; pitch: 25 μm (μιηη;; and interior angle: 82 5) on the back surface of a wedge-shaped light guide plate (pitch: 430 μm ( Ιιη)) formed. 5 The wedge-shaped light guide plate has a smooth front surface. <Comparative Example 2> A rear 稜鏡 member [width Wx length LX thickness τ = 288.8 χ 217.7 χ 2 · 4 〇 1 start) x 0.8 (end) mm (mm)] is the rear surface of a wedge type light guide plate The formation of a stripe pattern (pitch: 430 micron (μιη)) of 稜鏡10 (咼.14.25 μm (μηι); pitch: 25 micro-finish (pm); and inner angle: 82.5.). Further, the lanthanum is disposed on the front surface of the light guide plate perpendicularly to the light source, each having a pitch of 50 μm, a height of 25 μm, and 90. A section of the angle between adjacent lenses 15 . 2. Analysis of the results of the former optical components Table 2 Comparative comparison Experimental experiment Experimental experiment Experimental experiment Experimental normative normative normative normative normative normative paradigm paradigm 1 case 2 case 1 case 2 case 3 case 4 cases 5 cases 6 cases 7 cases 8 top X columnar columnar columnar columnar columnar columnar column lens lens lens lens lens " 1 1 .J lens L----- lens - 17- 200918973 Vertical Brightness (cd) 224.5 234.93 215.6 199.9 216.4 225.4 241.5 247.1 256.3 256.7 Pattern Visibility 1 1 4 4 4 3 3 3 2 2 Lens South/Lens Spacing 0.5 0.42 0.35 0.29 0.23 0.18 0.16 0.09 Pattern Visibility Rating: Excellent ( 5) > Very Good (4) > Good (3) > Fair (2) > Difference Table 2 shows experimental examples 1 to 8 盥 Comparative Ming Ming ^ ^ / Results of Targets 1 and 2. Figure - A luminance map is shown in accordance with experimental and comparative examples of the present invention. It can be seen from = and Fig. 6 that the two center luminances are obtained under the condition that the lens height to lens pitch ratio is less than (4); and compared with the comparison, "the excellent pattern visibility is displayed. At the same time, the cabinet between the experimental examples can be determined. The pattern between the ancient fishermen and the comparatively versatile model is this view and redundancy. The experimental examples 5 and 6 are the best. These results are determined to be the best. The pitch and height of the front surface of the light guide plate are at 1: (U to 丨: g.3, the dry circumference of the optical member, and the angle between adjacent optical structures • 18·200918973 is 60. to 120 The range, and the radius of curvature of each optical member is in the range of G.58 to 1.G times of each lens pitch. Example 3. Experimental and comparative of the posterior crucible component <Experimental paradigm #件[Width Wx Length Lx Thickness τ=288.8 x 217.7 x2.4〇1 ==〇.8 (End) mm (mm(10) on the rear surface of a wedge-shaped light guide plate with a radius of two micrometers (four)' pitch: 25 Micron (_), first-inner angle (4):,, #Γιιπ1λλ_,, brother-inner angle (cold): 45.) A stripe pattern (pitch: 430 micro-not (four)) In addition, the light guide plate has a front surface of the mirror. <Experimental Examples 1 to 13> Except that the first internal angle (α) is the same as that of the fifth example 9 - Experimental Example 10 to 13 The specific dimensions of the use and experiment in Experimental Examples 9 to n Table 3 are described in Tables 3 and 7. 7. ----- - η Experimental Range 90. ----- Experimental范—-- The first internal angle experimental example 11 Experimental example 12 Experimental example 13 (a) 85. 80. 75. 70. Intermediate angle--- --~~~---- --- -~—I _ 45. 45. 45. •19- 200918973 (Θ) Second inner angle (/5) 45. 50. 55. 60. 65. Prism height 25. 0 micron (μπι) 23. 0 micron (μπι 21. 2 micrometers (μπι) 19. 7 micrometers (μπι) 18. 3 micrometers (μπι) <Comparative example 3> One posterior component [width W x length L x thickness T = 288. 8 x 217.7 x 2.4 (Start) X 0.8 (end) mm (face) is 稜鏡 on the rear surface of a wedge-shaped light guide plate (height: • 5 14. 25 μm (μπι), pitch: 25 μm (μιη), internal angle ( α) : 82. 5° ) of a stripe pattern (between Further, the light guide plate has a mirror front surface. 4. Results analysis of the back surface flaw Comparative Example 3 Experimental Example 9 Experimental Example 10 Experimental Example 11 Experimental Example 12 Experimental example 13 Vertical brightness 217.6 217.5 272.2 256.5 230.0 211.3 (cd) Vertical half-view -9° / +7. -10. -10. -10. -10. -10. Angle / +12° / +12° / +12° / +15° / +17° First internal angle 48.75° 90. 85. 80. 75. 70. (α) Intermediate angle 82.5. 45. 50. 55. 60. 65. (Θ) -20- 200918973
表4顯示實驗性範例9至13與比較性銘办，。 據實驗性無較錄讎科表面稜鏡8係根 從表4和圖8可看出，相較於比較性範例3，在 7〇^件下’能呈現優越的中央亮度，辦有實驗性範 ^垂直半視肖。㈣確定，#比較在實驗性與比較性範例之 間的亮度與垂直半視角時，實驗性範例u和12是最佳。 1〇從上述可明白，隨著根據本發明實驗性範例的導光板，本發明 $液晶顯示裝置可實質獲得與傳統液晶顯示裝置相同效果，不 ，用在傳統液晶顯示裝置的背光單元中所使用的稜鏡片。即 疋，根據本發明的導光板使用，可免除在施加於傳統背光單元 的各種稜鏡片之中的一或兩個稜鏡片的必要性。 .5 【圖式簡單說明】 本發明的上述及其他態樣、特徵及其他優點可從下面連同附圖 的描述而更清楚明白，其中： 2〇圖1和2係根據本發明的第一具體實施描述當從不同角度看時 的一 LCD背光單元導光板透視圖； 圖3是沿著圖2線條A_A的截面圖； •21 · 200918973 圖4是沿著圖2線條B-B的截面圖； 圖5係根據本發明的實驗性範例描述一前透鏡透視圖； 圖6係根據本發明的實驗性與比較性範例顯示前透鏡亮度圖； 圖7係根據本發明的實驗性與比較性範例顯示後稜鏡圖； 5圖8係根據本發明的實驗性與比較性範例顯示後棱鏡亮度圖； 及 圖9係使用一傳統楔型導光板描述一背光單元結構截面圖。 【主要元件符號說明】 10 2 光源 3 反射板 4 導光板 5 擴散片 6 棱鏡片 15 7 保護片 100 主體 102 側表面 104 前表面 106 後表面 20 120 後稜鏡部件 122 棱鏡 140 前透鏡部件 142 光學構件 -22-Table 4 shows experimental examples 9 to 13 and comparative instructions. According to the experimental results, it can be seen from Table 4 and Figure 8. Compared with Comparative Example 3, it can exhibit superior central brightness under 7〇^, which is experimental. Fan ^ vertical half-view. (iv) Determination, # Comparing the brightness and vertical half angles between the experimental and comparative examples, the experimental examples u and 12 are optimal. As can be understood from the above, with the light guide plate according to the experimental example of the present invention, the liquid crystal display device of the present invention can substantially obtain the same effect as the conventional liquid crystal display device, and is not used in the backlight unit of the conventional liquid crystal display device. The picture. That is, the use of the light guide plate according to the present invention eliminates the necessity of one or two of the various cymbals applied to the conventional backlight unit. BRIEF DESCRIPTION OF THE DRAWINGS The above and other aspects, features and other advantages of the present invention will become more apparent from the description of the accompanying drawings in which: A perspective view of an LCD backlight unit light guide plate when viewed from different angles; FIG. 3 is a cross-sectional view along line A_A of FIG. 2; • 21 · 200918973 FIG. 4 is a cross-sectional view along line BB of FIG. 2; A front lens perspective view is depicted in accordance with an experimental example of the present invention; FIG. 6 shows a front lens brightness map in accordance with experimental and comparative examples of the present invention; and FIG. 7 shows a rear edge according to an experimental and comparative example of the present invention. Mirror; 5 Fig. 8 shows a rear prism brightness map according to experimental and comparative examples of the present invention; and Fig. 9 shows a sectional view of a backlight unit structure using a conventional wedge type light guide plate. [Main component symbol description] 10 2 Light source 3 Reflector 4 Light guide plate 5 Diffusion sheet 6 Prism sheet 15 7 Protective sheet 100 Main body 102 Side surface 104 Front surface 106 Rear surface 20 120 Back part 122 Prism 140 Front lens part 142 Optical Component-22-