1353458 • 九、發明說明： • 【發明所屬之技術領威】 本發明涉及一種應用於液晶顯示裝置之導光板，以及 採用該導光板之側置式背光模組。 【先前技術】 由於液晶顯示器面板之液晶本身不具有發光特性，因 而’爲達到顯示效果’需給液晶顯示器面板提供一面光源 _ 裝置，如背光模組，其作用在於向液晶顯示器面板供應輝 度充分且分佈均勻之面光源。 習知技術之背光模組主要由光源、導光板、反射板、 擴散片與稜鏡片組成。該光源可設置於導光板一側或兩相 對侧並將光線發射至該導光板。該導光板之作用在於引導 光線傳輸方向，使光線由導光板之出光面均勻出射，反射 板相對該導光板之底面設置，以將由導光板底面出射之光 線再次反射入該導光板内’提高光線之利用率。擴散片與 鲁 稜鏡片相對導光板之出光面依次設置’以使由導光板出射 之光線分佈更加均勻，進而提高液晶顯示器面板之輝度與 均勻性。 依導光板之形狀，其可分爲平板形導光板與楔形導光 板。另外，爲增加導光板之出光效率與均勻性，通常在導 光板之一面設置v形槽或配置網點，該v形槽或網點於導 光板上分佈之距離與大小可有不同設計。當光線傳輸至V 形槽或網點時’光線將發生反射與散射，並向各個不同方 向傳輸，最終由導光板之出光面射出。利用各種疏密、大 6 1353458 k 小不同之v形槽或網點，可使導光板發光均勻。 如圖1所示，一種習知技術之背光模組10。該背光模 Ιέ 10包括一導光板11、一光源12、一反射板15及一擴散 片16。該導光板11包括一入光面112，一與入光面112相 連之出光面114及一與出光面114相對之底面116。該光源 12靠近該入光面112設置。該反射板15設置於該底面116 下方。該擴散片16設置於該出光面114之上方。其中，爲 有效利用光源12所發出之光線，該背光模組10還包括一 ^ 反射燈罩17，其圍繞該光源12。爲破壞光線於導光板11 内部傳輸之全反射條件，該導光板11底面又設置複數呈行 列狀排布之圓形網點118。 如圖2所示，其爲網點118於該導光板11底面116之 分佈示意圖。該複數網點118沿與導光板11入光面112之 平行方向排佈成多列，並且每一列中網點118之大小相同。 該複數網點118沿與導光板11入光面112軸向垂直之方向 • 排佈成多行，並且每一行中網點118之大小不同，其中， 靠近入光面112之網點118之直徑最小，隨著與光源2距 離之增大，該網點118也逐漸變大。 如圖3所示，該導光板11之網點分佈採用等間距(Pitch) 設計，即同一列之複數網點118之中心連線XI與相鄰列之 複數網點118之中心連線X2之垂直距離Ypitch相等。當 導光板11爲較大尺寸時，相應列間距較大，靠近入光面112 之網點118將設計爲較小之尺寸，相應之靠近入光面112 之相鄰列之間隙也就較大。該複數間隙爲線形平齊排列， 7 1353458 - 應用於顯示面板’靠近入光面112之區域將可能産生複數 .亮線，從而直接降低顯示品質。進—步，當光源12採用冷 陰極螢光燈管時’燈管兩端之亮度較低，此因素將降低背 光模組之出光均勻性，從而降低顯示品質。 有蓉於此，提供一種克服上述缺點以提高光學均勻性 之導光板和背光模組實爲必要。 【發明内容】 鲁 下面將以若干實施例說明一種能減少於導光板出光面 靠近入光面出現亮線並提高光學均勻性之導光板，以及— 種採用該導光板之背光模組。 一種導光板，其包括一入光面；一與該入光面相連之 出光面；一與該出光面相對之底面，該底面形成有複數網 點’該複數網點呈列狀分佈，每一列均與入光面轴向方θ 平行，每一列中’中間處相鄰兩網點幾何中心之之間距最 小’越靠近兩端，該間距逐漸變大，且越遠離該入光面， • 每列網點之幾何中心之連線與其相鄰列網點之幾何中心連 線之垂直距離越大，網點密度越大。 一種为光模組，其包括至少一光源及一導光板，該導 光板包括一靠近該光源之入光面；一與該入光面相連之出 光面，一與該出光面相對之底面，該底面形成有複數網點， 該複數網點呈列狀分佈，每一列中，中間處相鄰兩網點幾 何中心之之間距最小’越靠近兩端，該間距逐漸變大，且 越遠離該入光面，每列網點之幾何中心之連線與其相鄰列 網點之幾何中心連線之垂直距離越大，網點密度越大。 8 1353458 • 與先前技術相比較，本實施例之導光板採用非等間距 (Pitch)設計：靠近入光面之相同列網點大小較小，且列與 列之間之間隙可控制於適當之較小範圍，從而避免靠近入 光面之區域産生複數亮線以提高背光模組之光學均勻性。 進一步地，在同一列方向上，採用中間間距窄兩端間距寬 之非等間距設計可有效解決由於光源兩端亮度較暗引起之 兩端光學特性不均。 φ 【實施方式】 下面將結合附圖和複數實施例對本發明背光模組及其 導光板作進一步之詳細說明。 請參閱圖4,本發明背光模組2〇之較佳實施例一。該 背光模組20包括一導光板21及一光源22。該導光板21 包括一入光面212 ; —與該入光面212相連之出光面214 ; 一與該出光面214相對之底面216，該底面216形成有複 數網點218。該光源22靠近該導光板21入光面212設置。 • 本實施例之光源22採用冷陰極螢光燈管。該導光板21可 由聚碳酸酯（PC)、聚甲基丙烯酸曱酯（PMMA)，或者其他 適合之透明合成樹脂材料製成。 請參閱圖5，該複數網點218呈列狀分佈。每一列均 與入光面212軸向方向（X軸方向）平行。每一列中相鄰 兩網點幾何中心之間距設定爲Xpitch_n，其中，中間處订 之最小，越靠近兩端，該間距Xpitch_(ni)逐漸變大。同時广 中間網點之尺寸最小，越靠近兩端，網點之尺寸變大，相 應單位面積内網點面積所占之比值越大，即密度逐漸增大。 9 1353458 在Y軸方向上，一列網點218之幾何中心之連線Yn 與其遠離入光面212之相鄰列網點218之幾何中心速線 Υ‘η+ι之垂直距離爲Ypitch_n ’該列網點218之幾何中心之速 線Yn+1與其遠離入光面212之相鄰列網點218之幾何中 心連線γη+2之垂直距離爲YpitchJn+i)。-㈣比Ypitclun 大。本實施例中’隶靠近入光面212之第一列網點218與 其相鄰列網點218之距離Υ-υ (未標示）最小。離該八 光面212越遠之列，其網點218之尺寸大小越大。綜上所 述，越遠離入光面212，每列網點218之幾何中心之速線 與其相鄰列網點之幾何中心連線之垂直距離越大，且網點 密度越大。 本實施例中之網點218爲正方形，其面積範圍爲1χ1(Γ7 平方笔米至1x10平方毫米。本發明之複數網點218 <通 過油墨印刷之方式形成油墨網點，或者通過掩模進行化學 钱刻産生具有微細散射霧面之網點^本實施例該複數網點 218採用通過油墨印刷之方式形成於該導光板21之底面 216’該複數網點218包括-般之油墨網點或含有散射劑之 油墨網點。 由於越遠離入光面212，網點密度（單位面積内網點 面積所占比例）越大’背光模組之光學均勻性可獲得保證。 而且本發明導光板21之網點分佈在方向上，採用非等 間距（Pitch)設計：靠近人光面212之相同列網點218大 小較小’但列與列之間之間隙可控制於適當之較小範圍， 從而避免靠近人光面112之區域産生複數亮線以提高背光 1353458 模組20之光學均勻性。進一步地，在同一列即χ軸方向上， 採用中間間距窄兩端間距寬之非等間距設計可有效解決由 於光源22兩端亮度較暗引起之兩端光學特性不均。 ，叫參閱圖ό，本發明背光模組之較佳實施例二。該背 光杈組30之導光板31與上述導光板21之結構大致相似， 其不同在於：該背光模組30採用雙光源設計，該導光板 31具有相對之兩入光面312，以及其底面316之網點318 分佈相應改變。本實施例中，導光板31兩入光面312之間 疋義中心軸線X6，且每個入光面312與該中心軸線Χ6 之，，每一列中相鄰兩網點318幾何中心之間距，中間處 ° 越罪近兩&，該間距逐漸變大。且越遠離該入光 面312$每列網點318之幾何中心之連線與其相鄰列網點 318 =4何中心連線之垂直距離越大，網點密度越大。 ，可以理解，考慮到兩個入光面可能接收不同強度之光 、 發月網點分佈可採用非對稱設計，即該中心軸線可 被替^該兩入光面之間之任意一軸線。 月/閱圖7，本發明背光模組之較佳實施例三。該導 χ回/〜較佳實施例—之導光板31之結構大致相似，其 於相鄰列之複數網點418分別錯開一定距離。此設 计有助於進一步提高出光均勻性。 Μ ^考上述實施例，可以理解，本發明之網點形狀可進 订種變化設計，其形狀包括圓點及任意多邊形之一。 ^所述’本發明確已符合發明專利要件，麦依法提 °月准，以上所述者僅為本發明之較佳實施例， 11 1353458 舉凡熟悉本案技藝之人士，於援依本案發明精神所作之等 效修飾或變化，皆應包含於以下之申請專利範圍内。 t圖式簡單說明】 • 圖1係習知技術背光模組側視圖。 圖2係圖1所示導光板底面網點分佈示意圖。 圖3係圖2局部III之放大示意圖。 圖4係本發明背光模組較佳實施例一之側視圖。 圖5係圖4所示背光模組之導光板底面網點分佈示意 圖。 圖6係本發明背光模組較佳實施例二之仰視圖。 圖7係本發明背光模組較佳實施例三之仰視圖。 【主要元件符號說明】 背光模組 20 ， 30 ， 40 導光板 21 光源 22 入光面 212 ， 312 出光面 214 底面 216 ， 316 網點 218 ， 318 ， 418 121353458 • IX. Description of the Invention: • The technology of the present invention relates to a light guide plate applied to a liquid crystal display device, and a side-mounted backlight module using the light guide plate. [Prior Art] Since the liquid crystal of the liquid crystal display panel itself does not have the illuminating property, the liquid crystal display panel needs to provide a light source _ device, such as a backlight module, in order to achieve the display effect, and the function thereof is to supply the liquid crystal display panel with sufficient brightness and distribution. Even surface light source. The backlight module of the prior art is mainly composed of a light source, a light guide plate, a reflection plate, a diffusion sheet and a cymbal sheet. The light source may be disposed on one side or two opposite sides of the light guide plate and emit light to the light guide plate. The light guide plate is configured to guide the light transmission direction so that the light is uniformly emitted from the light exit surface of the light guide plate, and the reflector is disposed opposite to the bottom surface of the light guide plate to reflect the light emitted from the bottom surface of the light guide plate into the light guide plate again to improve the light. Utilization rate. The light-emitting surfaces of the diffusion sheet and the ruthenium sheet are sequentially disposed with respect to the light-emitting surface of the ruthenium sheet to make the light distribution from the light guide plate more uniform, thereby improving the brightness and uniformity of the liquid crystal display panel. According to the shape of the light guide plate, it can be divided into a flat plate type light guide plate and a wedge type light guide plate. In addition, in order to increase the light extraction efficiency and uniformity of the light guide plate, a v-shaped groove or a mesh point is usually disposed on one surface of the light guide plate, and the distance and size of the v-shaped groove or the mesh point distributed on the light guide plate may be different. When the light is transmitted to the V-groove or dot, the light will be reflected and scattered, and transmitted to different directions, and finally emitted by the light-emitting surface of the light guide. The light guide plate can be uniformly illuminated by using various v-shaped grooves or dots of a small size and a large size of 1 1353458 k. As shown in FIG. 1, a backlight module 10 of the prior art is shown. The backlight module 10 includes a light guide plate 11, a light source 12, a reflection plate 15, and a diffusion sheet 16. The light guide plate 11 includes a light incident surface 112, a light exit surface 114 connected to the light incident surface 112, and a bottom surface 116 opposite to the light exit surface 114. The light source 12 is disposed adjacent to the light incident surface 112. The reflector 15 is disposed below the bottom surface 116. The diffusion sheet 16 is disposed above the light exit surface 114. In order to effectively utilize the light emitted by the light source 12, the backlight module 10 further includes a reflective lamp cover 17 surrounding the light source 12. In order to destroy the total reflection condition of the light transmitted inside the light guide plate 11, the bottom surface of the light guide plate 11 is further provided with a plurality of circular dots 118 arranged in a matrix. As shown in FIG. 2, it is a schematic diagram of the distribution of the dots 118 on the bottom surface 116 of the light guide plate 11. The plurality of dots 118 are arranged in a plurality of columns in a direction parallel to the light incident surface 112 of the light guide plate 11, and the dots 118 in each column are the same size. The plurality of dots 118 are arranged in a plurality of rows in a direction perpendicular to the axial direction of the light incident surface 112 of the light guide plate 11 and have different sizes of the dots 118 in each row, wherein the dot 118 close to the light incident surface 112 has the smallest diameter, As the distance from the light source 2 increases, the dot 118 also gradually becomes larger. As shown in FIG. 3, the dot distribution of the light guide plate 11 adopts a Pitch design, that is, the vertical distance Ypitch between the center line XI of the complex dot 118 of the same column and the center line X2 of the complex dot 118 of the adjacent column. equal. When the light guide plate 11 has a larger size, the corresponding column pitch is larger, and the dots 118 near the light incident surface 112 are designed to have a smaller size, and the gaps adjacent to the adjacent columns of the light incident surface 112 are larger. The complex gap is linearly aligned, 7 1353458 - applied to the display panel 'area close to the light incident surface 112 will likely produce a complex number. Bright lines, thereby directly reducing the display quality. Further, when the light source 12 is a cold cathode fluorescent tube, the brightness of both ends of the tube is low, and this factor will reduce the uniformity of the light output of the backlight module, thereby reducing the display quality. In view of this, it is necessary to provide a light guide plate and a backlight module that overcome the above disadvantages to improve optical uniformity. SUMMARY OF THE INVENTION A light guide plate capable of reducing a bright line near a light incident surface of a light guide plate and improving optical uniformity, and a backlight module using the light guide plate will be described with reference to a plurality of embodiments. A light guide plate comprising a light incident surface; a light emitting surface connected to the light incident surface; a bottom surface opposite to the light emitting surface, the bottom surface is formed with a plurality of dots; the plurality of dots are distributed in a column shape, and each column is The axial plane θ of the entrance surface is parallel, and the distance between the geometric centers of the two adjacent dots in the middle of each column is closer to the two ends, and the spacing becomes larger and farther away from the light entrance surface. The greater the vertical distance between the line connecting the geometric center and the geometric center line of its adjacent column points, the greater the dot density. An optical module includes at least one light source and a light guide plate, the light guide plate includes a light incident surface adjacent to the light source, a light emitting surface connected to the light incident surface, and a bottom surface opposite to the light emitting surface, A plurality of dots are formed on the bottom surface, and the plurality of dots are distributed in a column shape. In each column, the distance between the geometric centers of the two adjacent dots in the middle is the smallest, the closer to the two ends, the spacing gradually becomes larger, and the farther away from the light entrance surface, The greater the vertical distance between the line connecting the geometric center of each column and the geometric center line of its adjacent column points, the greater the dot density. 8 1353458 • Compared with the prior art, the light guide plate of the embodiment adopts a non-equal pitch design: the same column dots close to the light incident surface are small in size, and the gap between the columns and the columns can be controlled to be appropriate. A small range, thereby avoiding the generation of complex bright lines near the entrance surface to improve the optical uniformity of the backlight module. Further, in the same column direction, the non-equal spacing design with narrow pitches at both ends of the intermediate pitch can effectively solve the uneven optical characteristics of the two ends due to the darkness of the two ends of the light source. [Embodiment] Hereinafter, the backlight module and the light guide plate of the present invention will be further described in detail with reference to the accompanying drawings and the embodiments. Referring to FIG. 4, a preferred embodiment 1 of the backlight module 2 of the present invention is shown. The backlight module 20 includes a light guide plate 21 and a light source 22. The light guide plate 21 includes a light incident surface 212, a light exit surface 214 connected to the light incident surface 212, and a bottom surface 216 opposite to the light exit surface 214. The bottom surface 216 is formed with a plurality of dots 218. The light source 22 is disposed adjacent to the light incident surface 212 of the light guide plate 21. • The light source 22 of this embodiment employs a cold cathode fluorescent lamp. The light guide plate 21 may be made of polycarbonate (PC), polymethyl methacrylate (PMMA), or other suitable transparent synthetic resin material. Referring to FIG. 5, the plurality of dots 218 are arranged in a column. Each column is parallel to the axial direction (X-axis direction) of the light incident surface 212. The distance between the geometric centers of two adjacent dots in each column is set to Xpitch_n, where the middle is the smallest, and the closer to the both ends, the pitch Xpitch_(ni) becomes larger. At the same time, the size of the wide intermediate dot is the smallest, and the closer to the two ends, the larger the size of the dot, and the larger the ratio of the dot area in the corresponding unit area, that is, the density gradually increases. 9 1353458 In the Y-axis direction, the vertical distance between the geometric line Yn of a row of dots 218 and the geometric center velocity line Υ'η+ι of the adjacent column dots 218 far from the light-incident surface 212 is Ypitch_n 'the column dot 218 The vertical distance between the geometric center velocity line Yn+1 and the geometric center line γη+2 of the adjacent column dots 218 far from the light incident surface 212 is YpitchJn+i). - (d) Bigger than Ypitclun. In the present embodiment, the distance Υ-υ (not labeled) of the first column of dots 218 near the light incident surface 212 and its adjacent column dots 218 is the smallest. The farther away from the glazed surface 212, the larger the size of the dots 218. In summary, the farther away from the light-incident surface 212, the greater the vertical distance between the geometric center of each column of dots 218 and the geometric center of its adjacent column points, and the greater the dot density. The dots 218 in this embodiment are square and have an area ranging from 1 χ 1 (Γ7 square meters to 1×10 square millimeters. The plurality of dots 218 < the ink dots of the present invention are formed by ink printing, or chemical etching is performed through a mask. A dot having a fine scattering matte surface is produced. In this embodiment, the plurality of dots 218 are formed on the bottom surface 216' of the light guide plate 21 by ink printing. The plurality of dots 218 include a general ink dot or an ink dot containing a scattering agent. As the farther away from the light-incident surface 212, the dot density (the proportion of the dot area per unit area) is larger. The optical uniformity of the backlight module can be ensured. Moreover, the dot of the light guide plate 21 of the present invention is distributed in the direction, and the non-etc. Pitch design: the same column dots 218 near the human surface 212 are smaller in size, but the gap between the columns and columns can be controlled to a suitable smaller range, thereby avoiding the occurrence of complex bright lines in the region close to the human surface 112. To improve the optical uniformity of the backlight 1353458 module 20. Further, in the same column, that is, the direction of the χ axis, the intermediate pitch is narrow and the two ends are spaced apart. The non-equal spacing design can effectively solve the uneven optical characteristics of the two ends due to the darkness of the two ends of the light source 22. Referring to the figure, a preferred embodiment 2 of the backlight module of the present invention. The light guide plate of the backlight unit 30 The structure of the light guide plate 21 is substantially similar to that of the above-mentioned light guide plate 21, and the difference is that the backlight module 30 has a dual light source design, and the light guide plate 31 has opposite light incident surfaces 312, and the distribution of the mesh points 318 of the bottom surface 316 thereof is correspondingly changed. In the embodiment, the light guide plate 31 enters the center axis X6 between the light surfaces 312, and each of the light incident surfaces 312 and the center axis Χ6, and the geometric center of the adjacent two mesh points 318 in each column is in the middle, in the middle ° The more sinful the two & s, the spacing gradually becomes larger. And the farther away from the geometrical center of each of the light-receiving faces 312$ 318, the greater the vertical distance from the adjacent column 318 = 4 and the center line The greater the density of the dots, it can be understood that considering that the two light-incident surfaces may receive light of different intensities, the distribution of the moon-shaped dots may adopt an asymmetric design, that is, the central axis may be replaced by the two-into-light surface. Any axis. Month / reading 7. The preferred embodiment 3 of the backlight module of the present invention. The structure of the light guide plate 31 of the preferred embodiment is substantially similar, and the plurality of dots 418 of adjacent columns are respectively shifted by a certain distance. It is helpful to further improve the uniformity of light emission. Μ ^ In the above embodiment, it can be understood that the shape of the dot of the present invention can be changed into a variety of designs, and the shape thereof includes one of a dot and an arbitrary polygon. It has been in accordance with the requirements of the invention patents, and the above is only the preferred embodiment of the present invention. 11 1353458 For those who are familiar with the art of the present invention, the equivalent modifications or changes made by the aid of the invention in the spirit of the present invention, All should be included in the scope of the following patent application. A brief description of the t-pattern] Figure 1 is a side view of a conventional backlight module. 2 is a schematic view showing the distribution of the dot points on the bottom surface of the light guide plate shown in FIG. 1. Figure 3 is an enlarged schematic view of a portion III of Figure 2. 4 is a side view of a preferred embodiment 1 of a backlight module of the present invention. FIG. 5 is a schematic view showing the distribution of the dot distribution on the bottom surface of the light guide plate of the backlight module shown in FIG. 4. 6 is a bottom plan view of a second preferred embodiment of the backlight module of the present invention. Figure 7 is a bottom plan view of a preferred embodiment 3 of the backlight module of the present invention. [Main component symbol description] backlight module 20, 30, 40 light guide plate 21 light source 22 light-incident surface 212, 312 light-emitting surface 214 bottom surface 216, 316 mesh point 218, 318, 418 12