200815790 九、發明說明： 【發明所屬之技術領域】 、本，明涉及一種應用於液晶顯示農置之導光板，以及 探用該導光板之侧置式背光模組。 【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 而爲達到顯不效果，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。 !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侧或兩相 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 ⑩ 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 200815790 J不同之v%槽或網點，可使導光板發光均句。 •如圖1所示，—種習知技術之背光模組1〇。該背光模 、、且1〇包括一導光板11、一光源12、一反射板15及一擴散 片· 16。該導伞& 、 反11包括一入光面112，一與入光面Π2相 出光面114及一與出光面114相對之底面116。該光源 ^近該入光面U2設置。該反射板15設置於該底面116 有效利==散片16設置於該出光面114之上方。其中，爲 反射产罩“嚴I〕所發出之光線’該背光模組還包括一 内部傳輪入’其圍繞該光源12。爲破壞光線於導光板11 列狀排冻!之全反射條件，該導光板11底面又設置複數呈行 之圓形網點118。 如圖2 % - ^ 分佈八音7^爲網點118於該導光板11底面116之 =圖。該複數網點118沿與導光板u入光面ιΐ2之 該_==成多列’並且每一列中網點118之大小相同。 排與導光板11入光面112轴_之方向 靠近入； 行中網點118之大小不同，其中’ 離L ΐ面112之網點118之直徑最小，隨著與光源2距 之増大，該網點118也逐漸變大。 圖3所7^料光板11之網點分佈採用等間距(Pitch) =即同-列之複數網點118之中心連線χι與相鄰列之 =周點118之中心連線X2之垂直距離細相等。當 爲較大尺寸時，相應列間距較大，靠近入光面m =點m將設計爲較小之尺寸’相應之靠近入光面ιΐ2 之相鄰列之間隙也就較大。該複數間隙爲線形平齊排列’ 7 200815790 應用於顯示面板，靠近入光面112之區域將可能產生複數 免線’從而直接降低顯示品質。進一步，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 光核組之出光均勻性’從而降低顯示品質。 有鑒於此，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】 φ 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，以及一 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，每一列均與入光面軸向方向 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。 /種背光模組’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 200815790 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 歹ΐ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20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 ’ 一與該入光面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。 ⑩ 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)、聚曱基丙烯酸曱酯（ΡΜΜΑ)，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。每一列岣 與入光面212車由向方向（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Xpheh 之最小，越#近兩^ 該間距Xpitch__(n-1)逐漸變大。同時， 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 200815790 在Y轴方向上，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之幾何中心連線 之垂直距離爲Ypitch_n，該列網點218之幾何中心之連 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 Υη+2 之垂直距離爲 Ypitch_(n+1)。Ypitch」n+1)比 Ypitch_n 大。本實施例中，最靠近入光面212之第一列網點218與 其相鄰列網點218之距離(未標示）最小。離該入 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之幾何中心之連線 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lxl〇d 平方毫米至lxlO4平方毫米。本發明之複數網點218可通 過油墨印刷之方式形成油墨網點，或者通過掩模進行化學 蝕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包括一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γ轴方向上=用等 間距（Pitch)言史計：#近入光面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© 112之區域産生複數亮線以提^背光 200815790 模組20之光學均勻性。進一步地，在同一列即χ轴方向上， 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。 .請參閱圖6，本發明背光模組之較佳實施例二。該背 光模組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 馨分佈相應改變。本實施例中，導光板31兩入光面312之間 定義一中心轴線X6，且每個入光面312與該中心軸線χ6 之間’每一列中相鄰兩網點318幾何中心之間距，中間處 之最小，越靠近兩端，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松鄰列網點 318之幾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 束’本發明網點分佈可採用非對稱設計，即該中心軸線可 • 被替選爲該兩入光面之間之任意一軸線。 請參閱圖7,本發明背光模組之較佳實施例三。該導 光板41與較佳實施例一之導光板31之結構大致相似，其 不同在於相鄰列之複數網點418分別錯開一定距離。此設 計有助於進一步提高出光均勻性。 參考上述實施例，可以理解，本發明之網點形狀可進 行各種變化設計，其形狀包括圓點及任意多邊形之一。 综上所述，本發明確已符合發明專利要件，爰依法提 出專利申請。惟，以上所述者僅為本發明之較佳實施例， 11 200815790 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。 【圖式簡單說明】 ’圖1係習知技術背光模組侧視圖。 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 圖〇 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 12200815790 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a light guide plate for use in a liquid crystal display, and a side-mounted backlight module for detecting the light guide plate. [Prior Art] Since the liquid crystal of the liquid crystal display panel itself does not have the illuminating property, in order to achieve the display effect, it is necessary to provide the liquid crystal display panel with a light source device such as a backlight module, 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 known technology 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 to make the light 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 to improve the light. Utilization rate. The light-emitting surface of the diffusion sheet and the 10-inch sheet relative to the light guide plate are sequentially disposed 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 light is transmitted to a V-groove or dot, the light will be reflected and scattered and transmitted to different directions, eventually ejected from the exit surface of the light guide. The light guide plate can be illuminated by using various v% slots or dots of different density and large size. • As shown in Figure 1, a conventional backlight module is used. The backlight module includes a light guide plate 11, a light source 12, a reflection plate 15, and a diffusion sheet 16. The guide umbrella & 11 includes a light incident surface 112, a light exit surface 114 opposite to the light entrance surface 2, and a bottom surface 116 opposite the light exit surface 114. The light source ^ is disposed near the light incident surface U2. The reflector 15 is disposed on the bottom surface 116. The slab 16 is disposed above the light exit surface 114. Wherein, the light emitted by the reflective cover "Strict I" includes an internal transfer wheel that surrounds the light source 12. The total reflection condition for destroying the light in the column of the light guide plate 11 is The bottom surface of the light guide plate 11 is further provided with a plurality of circular dots 118. The distribution of the octaves 7^ is the map of the dots 118 on the bottom surface 116 of the light guide plate 11. The complex dots 118 are along the light guide plate u. The _== into the multi-column of the illuminating surface ιΐ2 and the size of the dots 118 in each column are the same. The row and the light guide plate 11 are in the direction of the axis _ of the light-emitting surface 112; the size of the dots 118 in the row is different, The dot 118 of the L face 112 has the smallest diameter, and the dot 118 gradually becomes larger as the distance from the light source 2 is larger. The dot distribution of the light plate 11 of Fig. 3 is equally spaced (Pitch) = the same column The center line of the plurality of dots 118 is equal to the vertical distance of the center line X2 of the adjacent column = the circumferential point 118. When the size is larger, the corresponding column spacing is larger, close to the entrance surface m = point m The gap that is designed to be smaller in size 'corresponding to the adjacent column of the entrance surface ιΐ2 is larger. The number of gaps is linearly aligned. ' 7 200815790 is applied to the display panel. The area near the entrance surface 112 may generate a plurality of free lines' to directly reduce 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 light emission of the backlight core group, thereby reducing the display quality. Accordingly, it is necessary to overcome the above disadvantages to improve optical uniformity. The light guide plate and the backlight module are necessary. [Explanation] φ Hereinafter, a light guide plate capable of reducing a bright line near the light incident surface of the light guide plate and improving optical uniformity, and a backlight module using the light guide plate will be described in several embodiments. The light plate comprises 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 connected to the light The axial direction of the surface is parallel, and the distance between the geometric centers of two adjacent dots in the middle of each column is the smallest, and the closer to the both ends, the spacing is gradually increased, and Away from the illuminating 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. The backlight module includes at least one light source and one 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; a bottom surface opposite to the light emitting surface, the bottom surface is formed with a plurality of dots, and the plurality of dots are distributed in a column shape 'In each column, the geometric center between two adjacent dots in the middle is the smallest. The closer to the two ends, the larger the distance is, and the farther away from the light-incident surface, the line connecting the geometric center of each column and its adjacent column. The greater the vertical distance of the geometric center of the dot, the greater the density of the dot. 8 200815790 Compared with the prior art, the light guide of the embodiment adopts a non-equal pitch design: the same column size close to the light entrance surface Small, and the gap between the columns and the crucible can be controlled to a suitable smaller range, so as to avoid generating a plurality of 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 20 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), polydecyl acrylate, or other suitable transparent synthetic resin material. Referring to FIG. 5, the plurality of dots 218 are arranged in a column. Each row 岣 and the light incident surface 212 are parallel to the direction (X-axis direction). The distance between the geometric centers of two adjacent dots in each column is set to Xpitch_n, where the minimum Xpheh is at the middle, and the closer to the two is, the pitch Xpitch__(n-1) gradually becomes larger. At the same time, the size of the intermediate dot is the smallest, and the closer to the both 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 200815790 In the Y-axis direction, the vertical distance between the line Yn of the geometric center of a column of dots 218 and the geometric center line of the adjacent column dots 218 far from the light-incident surface 212 is Ypitch_n, and the geometric center of the column dot 218 is connected. The vertical distance between the line Yn+1 and the geometric center line Υη+2 of the adjacent column dots 218 far from the light incident surface 212 is Ypitch_(n+1). Ypitch"n+1) is larger than Ypitch_n. In this embodiment, the distance (not labeled) of the first column of dots 218 closest to the light incident surface 212 and its adjacent column of dots 218 is the smallest. The farther away from the incident surface 212, the larger the size of the dots 218. In summary, the farther away from the light entrance surface 212, the greater the vertical distance between the line connecting the geometric center of each column of dots 218 and the geometric center line of its adjacent column dots, and the greater the dot density. The dots 218 in this embodiment are square and have an area ranging from lxl 〇 d mm 2 to l x 10 4 mm. The plurality of dots 218 of the present invention can form ink dots by ink printing or chemically etch through a mask to produce dots having fine scattering matte. In the 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 distance from the light entrance surface 212 is farther, the dot density (the proportion of the dot area per unit area) is larger, and the optical uniformity of the backlight module can be ensured. Moreover, the dot distribution of the light guide plate 21 of the present invention is in the γ-axis direction = Pitch is used: the same column dot 218 of the near-into-light surface 212 is small in size, but the gap between the columns and the columns can be controlled. In a suitable smaller range, a plurality of bright lines are generated close to the area of the human light © 112 to improve the optical uniformity of the backlight 200815790 module 20. Further, in the same column, i.e., the y-axis direction, the non-equal spacing design with narrow pitches at both ends of the intermediate pitch can effectively solve the uneven optical characteristics at both ends due to the darkness of the two ends of the light source 22. Referring to FIG. 6, a preferred embodiment 2 of the backlight module of the present invention is shown. The light guide plate 31 of the backlight module 30 is substantially similar to the structure of the 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 a bottom surface thereof. The distribution of the 318 outlets 318 changes accordingly. In this embodiment, a central axis X6 is defined between the light incident surfaces 312 of the light guide plate 31, and the geometric center between the adjacent two mesh points 318 in each column between each light incident surface 312 and the central axis χ6. The smallest in the middle, the closer to the ends, the larger the spacing. The further away from the light entrance surface 312, the greater the vertical distance between the line connecting the geometric center of each column of dots 318 and the geometric center line of the loose adjacent column dots 318, and the greater the dot density. It will be appreciated that it is contemplated that the two illuminating surfaces may receive beams of different intensities. The dot distribution of the present invention may employ an asymmetrical design, i.e., the central axis may alternatively be selected as any one of the axes between the two incoming surfaces. Please refer to FIG. 7, which is a third embodiment of the backlight module of the present invention. The structure of the light guide plate 41 is substantially similar to that of the light guide plate 31 of the preferred embodiment, except that the plurality of dots 418 of adjacent columns are respectively shifted by a certain distance. This design helps to further improve the uniformity of light output. Referring to the above embodiment, it can be understood that the dot shape of the present invention can be variously modified, and its shape includes one of a dot and an arbitrary polygon. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 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 diagram showing the distribution of the bottom surface of the light guide plate of the backlight module shown in FIG. 4. FIG. 6 is a bottom view of the second 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