101年.02月10日修正替換頁 1364590 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種背光模組，尤其涉及一種用於液晶顯示 面板之背光模組。 【先前技術】 [0002] 由於液晶顯示器面板本身不具發光特性，所以，爲達到 顯示效果，需要給液晶顯示器面板提供一面光源裝置， 如背光模組，其功能爲向液晶顯示器面板供應輝度充分 而且分佈均句之面光源。 [0003] 先前技術之背光模組主要由光源、導光板、反射板、擴 散板和棱鏡板組成。導光板一般包括入光面、出光面及 底面。其中，光源可設置於導光板一側或兩相對侧與入 光面相對，並將光線發射至導光板。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志面均勻出射 。因爲光源發出之光線係從導光板入光面進入，所以導 光板靠近光源之部分較亮，而遠離光源之部分較暗，因 此，爲增加導光板之出光效率和均勻度，通常在導光板 之一面設置V形槽或配置光擴散網點。當光線傳輸至V形 槽或光擴散網點時，光線將發生反射和散射，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、大小不同之V形槽或光擴散網點，可以使導光板發 光趨於均勻。 [0004] 實際應用中還根據距離光源之距離改變擴散結構之分佈 以使出光更加均勻，如增加遠離光源處之網點尺寸等。 惟，爲了防止導光板中之光線泄漏，導光板之側面處通 09510630产單編號 A〇101 第3頁/共14頁 1013049416-0 1364590 101年.02月10日梭正替换頁 常塗有反射膜或設置反射片使光反射回導光板内，導致 靠近側面處之光強度較大，此稱爲邊界反射效應。因此 若僅以離光源之距離來計算網點之大小，則最終所得之 導光板之出光仍然不夠均勻。 （· 【發明内容】 [0005] 有鑒於此，有必要提供一種具有更加均勻出光之背光模 組。 [0006] 一種背光模組，其包括光源及一導光板，該光源包括複 數發光單元，該導光板包括一底面 '一與該底面相對之 出光面及與該底面及出光面相鄰之至少一入光面及複數 侧面，侧面處塗有反射膜或設置有反射片，底面上分佈 有複數擴散單元，擴散單元之尺寸隨該擴散單元與該複 數發光單元中每個發光單元間之距離及該擴散單元與該 複數發光單元相對該反射面所成的像中的每個像間距離 之平方和增大而增大。 [0007] 本實施例之背光模組中，擴散單元分佈充分考慮導光板 侧面處之邊界反射效應，使底面上擴散單元之分佈根據 光反射狀況作出修正，可提高最終出光之均勻度。 【實施方式】 [0008] 請參閱圖1及圖2，本發明第一實施例之背光模組10包括 複數設置成一列的點光源11、及一導光板12。點光源11 可爲發光二極體（Light Emitting Diode, LED)、汞 燈或其他形式之點光源。導光板12可爲矩形，其包括一 入光面121、三個侧面122、一與入光面121及三個側面 122垂直之出光面123及一與出光面123相對之底面124。 09510630# 單编號 A0101 第4頁/共14頁 1013049416-0 1364590 V 101年.02月10日修正替換頁 導光板12之厚度可爲1釐米〜10釐米。點光源11靠近入光 面121設置。導光板12可由透明之材料如壓克力樹脂、丙 烯酸樹脂、聚碳酸酯、聚乙烯樹脂或玻璃等製成。製作 工藝包括壓出成型、射出成型等。側面122處可塗有光反 射膜或於侧面處設置反射片。 [0009] 導光板12底面124上形成有複數擴散單元13，其可向外凸 起，也可凹進導光板12。擴散單元13可爲半球體、橢球 體、圓錐體、削去尖端之錐形台或多面體之網點，相應 的，擴散單元13在底面124上之投影可爲圓形或多邊形。 本實施例中擴散單元13爲半球形網點，其在底面124上之 投影爲圓形。擴散單元13可呈行列規則分佈，其中，沿 和入光面121平行之方向以均勻間距設置多列擴散單元13 ，沿和入光面121垂直之方向以均勻間距設置多行擴散單 元13。爲進一步增強擴散單元13對光線之散射作用，相 鄰之擴散單元行或列之間可交錯排佈，當然，擴散單元 13也可以其他規則排列。擴散單元13也還可爲其他之擴 散結構如V形槽等。 [0010] 本實施例中之半球形網點之大小隨該網點與該複數點光 源中每個點光源間之距離及該網點與該複數點光源相對 該反射面成之像中之每個像間之距離之平方和之增大而 增大，從而形成圖2所示之分佈。底面124上任一點處擴 散單元13之具體尺寸計算方法如下。 [0011] 將複數點光源11中之每個分別與底面124上任一點（X，Y) 隱063(^單編號A0101 第5頁/共14頁 1013049416-0 1364590 -101年.02月io日按正替&頁 1 ，其中（Xi.Yi)爲點 光源11之座標’ η絲光源之數目。將複數點光源lu目肖 ; 可進行反射之側面所成之像之每個分別與底面124上任一 點（X，Y)置於同一直角坐標系中，求得101. February 10th revised replacement page 1364590 VI. Description of the Invention: [Technical Field] [0001] The present invention relates to a backlight module, and more particularly to a backlight module for a liquid crystal display panel. [Prior Art] [0002] Since the liquid crystal display panel itself has no illuminating characteristics, in order to achieve the display effect, it is necessary to provide a liquid crystal display panel with a light source device, such as a backlight module, whose function is to supply the liquid crystal display panel with sufficient brightness and distribution. The surface light source of the sentence. [0003] The backlight module of the prior art is mainly composed of a light source, a light guide plate, a reflection plate, a diffusion plate, and a prism plate. The light guide plate generally includes a light incident surface, a light exit surface, and a bottom surface. The light source may be disposed on one side or opposite sides of the light guide plate opposite to the light incident surface, and emit light to the light guide plate. The function of the light guide plate is to guide the light transmission direction so that the light is uniformly emitted from the exit surface of the light guide plate. Because the light emitted by the light source enters from the light incident surface of the light guide plate, the light guide plate is brighter near the light source portion, and the portion away from the light source is darker. Therefore, in order to increase the light extraction efficiency and uniformity of the light guide plate, usually in the light guide plate Set a V-shaped groove on one side or configure a light diffusion dot. When the light is transmitted to the V-groove or the light-diffusing dot, the light will be reflected and scattered, and will be transmitted in different directions, and finally emitted from the light-emitting surface of the light guide plate. The light guide plate can be made uniform by using various V-shaped grooves or light diffusion dots of different sizes and sizes. [0004] In practical applications, the distribution of the diffusion structure is also changed according to the distance from the light source to make the light output more uniform, such as increasing the size of the dot away from the light source. However, in order to prevent the light leakage in the light guide plate, the side of the light guide plate is passed through the 09516630 production order number A〇101. Page 3/14 pages 1013049416-0 1364590 101. On February 10, the shuttle replacement page is often coated with reflection. The film or the reflective sheet is provided to reflect light back into the light guide plate, resulting in a greater intensity of light near the side, which is referred to as a boundary reflection effect. Therefore, if the size of the dot is calculated only by the distance from the light source, the light output of the finally obtained light guide plate is still not uniform enough. [0005] In view of the above, it is necessary to provide a backlight module having a more uniform light output. [0006] A backlight module includes a light source and a light guide plate, the light source includes a plurality of light emitting units, The light guide plate includes a bottom surface ′ a light emitting surface opposite to the bottom surface and at least one light incident surface and a plurality of side surfaces adjacent to the bottom surface and the light emitting surface, and the side surface is coated with a reflective film or a reflective sheet, and the bottom surface is distributed with plural Diffusion unit, the size of the diffusion unit is different from the distance between the diffusion unit and each of the plurality of illumination units, and the distance between each of the images formed by the diffusion unit and the complex illumination unit relative to the reflection surface [0007] In the backlight module of the embodiment, the diffusion unit distribution fully considers the boundary reflection effect at the side of the light guide plate, so that the distribution of the diffusion unit on the bottom surface is corrected according to the light reflection condition, which can improve the final [0008] Referring to FIG. 1 and FIG. 2, the backlight module 10 of the first embodiment of the present invention includes a plurality of columns arranged in a column. The point light source 11 and the light guide plate 12. The point light source 11 can be a light emitting diode (LED), a mercury lamp or other forms of point light source. The light guide plate 12 can be rectangular, and includes a light incident surface 121. The three side surfaces 122, a light exit surface 123 perpendicular to the light incident surface 121 and the three side surfaces 122, and a bottom surface 124 opposite to the light exit surface 123. 09510630# Single number A0101 Page 4 / Total 14 pages 1013049416-0 1364590 V 101. February 10, the replacement page light guide plate 12 may have a thickness of 1 cm to 10 cm. The point light source 11 is disposed near the light incident surface 121. The light guide plate 12 may be made of a transparent material such as acrylic resin, acrylic resin, It is made of polycarbonate, polyethylene resin or glass, etc. The manufacturing process includes extrusion molding, injection molding, etc. The side surface 122 may be coated with a light reflecting film or provided with a reflecting sheet at the side surface. [0009] The bottom surface 124 of the light guiding plate 12 A plurality of diffusion units 13 are formed, which may be outwardly convex or recessed into the light guide plate 12. The diffusion unit 13 may be a hemisphere, an ellipsoid, a cone, a truncated cone or a polyhedron, and corresponding dots. , the diffusion unit 13 is on the bottom surface 124 In this embodiment, the diffusion unit 13 is a hemispherical mesh point whose projection on the bottom surface 124 is circular. The diffusion unit 13 can be regularly arranged in a row and column, wherein the diffusion unit 13 is parallel to the light incident surface 121. The plurality of rows of diffusion units 13 are disposed at a uniform pitch in the direction, and the plurality of rows of diffusion units 13 are disposed at a uniform pitch in a direction perpendicular to the light incident surface 121. To further enhance the scattering effect of the diffusion unit 13 on the light, adjacent diffusion unit rows or columns The arrangement may be staggered. Of course, the diffusion unit 13 may be arranged in other rules. The diffusion unit 13 may also be other diffusion structures such as V-shaped grooves or the like. [0010] The size of the hemispherical dot in the embodiment corresponds to the distance between the dot and each of the plurality of point sources and the image of the dot and the complex point relative to the reflective surface The sum of the squares of the distances increases to form the distribution shown in FIG. The specific size calculation method of the diffusion unit 13 at any point on the bottom surface 124 is as follows. [0011] Each of the plurality of point light sources 11 and any point on the bottom surface 124 (X, Y) is hidden 063 (^ single number A0101 page 5 / total 14 pages 1013049416-0 1364590 - 101 years. 02 months io day press Orthogonal & page 1, where (Xi.Yi) is the number of the coordinates of the point source 11 'n wire source. The plurality of point sources are visible; each of the images of the sides that can be reflected is respectively associated with the bottom surface 124 Any point (X, Y) is placed in the same Cartesian coordinate system.
故 X 其中 2 (Xji，Yji)爲點光源11分別關於側面122成之像之座標 ，η爲點光源之數目，m爲進行反射之側面之數目，f爲 h 側面處之反射係數。任一點（X，Y)處之擴散單元13之尺寸 D可由以下公式計算： k [0012]其中％和k爲常數’其與導光板之尺寸 '點光源距離導光 板之距離等因素相關。％可限制擴散單元之最小尺寸，反 應擴散單元13隨其離光源大小變化之程度。給出一定之 初值後，可採用光學模擬軟體模擬導光板之擴散效果， 或者做出樣品驗證，以確定最優之Γ()和k及擴散單元13之 大小。 反映 [0013] 上述計算公式中 09510630癸單编& A0101Therefore, X (Xji, Yji) is the coordinate of the image of the point source 11 with respect to the side surface 122, η is the number of point sources, m is the number of sides for reflection, and f is the reflection coefficient at the side of h. The size D of the diffusion unit 13 at any point (X, Y) can be calculated by the following formula: k [0012] where % and k are constants' which are related to factors such as the size of the light guide plate, the distance of the point source from the light guide plate, and the like. % limits the minimum size of the diffusion unit and the extent to which the reaction diffusion unit 13 varies with the size of the light source. After giving a certain initial value, the optical simulation software can be used to simulate the diffusion effect of the light guide plate, or sample verification can be performed to determine the optimum Γ() and k and the size of the diffusion unit 13. Reflect [0013] In the above calculation formula, 09510630癸单编 & A0101
2-12-1
2 第6頁/共14頁 1013049416-0 1364590 10l·年.02月10日修正齊¥頁 離光源之距離對擴散單元尺寸之影響，2 Page 6 of 14 1013049416-0 1364590 10l·Year.02月10日改齐¥页 The effect of the distance from the light source on the size of the diffusion unit,
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反映側面 處之光反射對擴散單元尺寸之影響。 [0014] 爲進一步闡明本實施例中之擴散單元13尺寸分佈規律， 請參閱圖3，從簡化計算考慮，將點光源11視爲與底面 124處於同一個平面，當然實際産品中光源可能會不在底 面124所在之平面内，但計算出之結果具有高度近似性。 以底面124所在之平面爲XY平面，以複數點光源31所在之 直線爲Y軸，以複數點光源之中點處與Y軸之垂線爲X軸， 取1^=10微米，k = 0. 005，導光板沿Y方向尺寸爲20釐米 ，分別計算X = 0. 01，0. 03，0. 05，0. 07(米）線上網點 尺寸分佈，結果分別如圖4A-D所示。 [0015] 擴散單元13分佈沿X軸對稱，當距離光源較近時，兩側之 擴散單元13尺寸較小，靠近X軸之擴散單元13尺寸較大； 隨X增大，擴散單元13尺寸增大，但越靠近X軸之擴散單 元13尺寸之增大速度越快，最終形成兩側比中間之擴散 單元13尺寸大之分佈。 [0016] 以上公式綜合考慮側面處之邊界反射效應，並相應調整 擴散單元之尺寸，從而可實現導光板對光更加均勻之擴 散，增加最終出光之均勻度。 [0017] 請參閱圖5，本發明第二實施例之背光模組50與第一實施 例之背光模組10基本相同，不同之處在於背光模組50中 09510630^^^^ A〇101 第7頁/共14頁 1013049416-0 1364590 101年.02月io日修正替換頁 採用線光源51取代背光模組10中之複數點光源51。線光 源51可爲冷陰極熒光燈或外置電極熒光燈等。 [0018] 線光源51可視爲由大量長度爲dl之發光單元511組成， dl可爲任意小之長度，則第一實施例中之尺寸D之計算公 式應用到本實施例中時，對光源數量之求和轉化爲對光 源長度1之定積分。 rdl + ¥ (X-Xi)2 +χν-ϊι)2 dl [0019] 其中，m爲線光源51之數目，b爲進行反射之側面之數目 ，1爲線光源51之長度，（X,，Y,)爲線光源51上發光單 m 11 元511之座標，（X,k，Y,J爲線光源51中發光單元511關Reflects the effect of light reflection at the side on the size of the diffusion unit. [0014] In order to further clarify the size distribution law of the diffusion unit 13 in this embodiment, referring to FIG. 3, considering the simplified calculation, the point light source 11 is regarded as being in the same plane as the bottom surface 124, and of course, the light source may not be in the actual product. The bottom surface 124 is in the plane, but the calculated result is highly approximate. The plane where the bottom surface 124 is located is the XY plane, and the line where the complex point source 31 is located is the Y axis, and the vertical line of the point of the complex point source and the Y axis is the X axis, and 1^=10 μm, k = 0. 005, the size of the light guide plate in the Y direction is 20 cm, and the size distribution of the Internet access point of X = 0.01, 0.03, 0.05, 0.07 (m), respectively, is calculated, and the results are shown in Fig. 4A-D, respectively. [0015] The diffusion unit 13 is distributed symmetrically along the X-axis. When the distance from the light source is relatively close, the diffusion unit 13 on both sides is small in size, and the diffusion unit 13 near the X-axis is large in size; as the X increases, the diffusion unit 13 increases in size. Larger, but the faster the size of the diffusion unit 13 closer to the X-axis, the faster the distribution of the two sides is larger than the size of the diffusion unit 13 in the middle. [0016] The above formula comprehensively considers the boundary reflection effect at the side, and adjusts the size of the diffusion unit accordingly, thereby achieving a more uniform diffusion of the light guide plate and increasing the uniformity of the final light output. [0017] Referring to FIG. 5, the backlight module 50 of the second embodiment of the present invention is substantially the same as the backlight module 10 of the first embodiment, and the difference is that the backlight module 50 is in the 09510630^^^^ A〇101 7 pages/total 14 pages 1013049416-0 1364590 The 101.02 month io day correction replacement page uses the line source 51 instead of the plurality of point sources 51 in the backlight module 10. The line light source 51 may be a cold cathode fluorescent lamp or an external electrode fluorescent lamp or the like. [0018] The line light source 51 can be regarded as being composed of a plurality of light-emitting units 511 having a length of dl, and dl can be any small length. When the calculation formula of the dimension D in the first embodiment is applied to the embodiment, the number of light sources is used. The summation is converted to a fixed integral of the length 1 of the light source. Rdl + ¥ (X-Xi) 2 + χν-ϊι) 2 dl [0019] where m is the number of line sources 51, b is the number of sides on which reflection is performed, and 1 is the length of the line source 51, (X,, Y,) is a coordinate of the light source m 11 511 on the line source 51, (X, k, Y, J is the light-emitting unit 511 in the line source 51)
1 D 1 D 於反射侧面所成像之座標。其他變量與第一實施例中相 同。 [0020] 綜上所述，本發明確已符合發明專利之要件，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方 式，本發明之範圍並不以上述實施方式為限，舉凡熟習 本案技藝之人士援依本發明之精神所作之等效修飾或變 化，皆應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 [0021] 圖1係本發明第一實施例之背光模組側面示意圖。 [0022] 圖2係本發明第一實施例之背光模組底面示意圖。 [0023] 圖3係計算第一實施例之底面上擴散單元尺寸示意圖。 095_产單編號A〇101 第8頁/共14頁 1013049416-0 1364590 101:年.02月10日修正替¥頁 [0024] 圖4 A-D係第一實施例之背光模組之導光板不同截面上之 擴散單元分佈示意圖。 « [0025] 圖5係本發明第二實施例之背光模組結構示意圖。 « [0026] 【主要元件符號說明】 點光源：11 [0027] 導光板：12 [0028] 擴散單元：13 [0029] 入光面：121 [0030] 側面：122 [0031] 出光面：12 3 [0032] 底面：124 [0033] 線光源：51 [0034] 發光單元：511 09510630^單編號 A〇101 第9頁/共14頁 1013049416-01 D 1 D The coordinates imaged on the side of the reflection. The other variables are the same as in the first embodiment. [0020] In summary, the present invention has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or changes in accordance with the spirit of the present invention. It should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS [0021] FIG. 1 is a side view of a backlight module according to a first embodiment of the present invention. 2 is a schematic diagram of a bottom surface of a backlight module according to a first embodiment of the present invention. 3 is a schematic view showing the size of a diffusion unit on the bottom surface of the first embodiment. 095_Bill No. A〇101 Page 8/Total 14 Page 1013049416-0 1364590 101: Year. February 10th Revision Replacement Page [0024] FIG. 4 AD is different from the light guide plate of the backlight module of the first embodiment Schematic diagram of the distribution of the diffusion unit on the cross section. [0025] FIG. 5 is a schematic structural view of a backlight module according to a second embodiment of the present invention. « [0026] [Main component symbol description] Point light source: 11 [0027] Light guide plate: 12 [0028] Diffusion unit: 13 [0029] Light-in surface: 121 [0030] Side: 122 [0031] Light-emitting surface: 12 3 [0032] Bottom surface: 124 [0033] Line light source: 51 [0034] Light-emitting unit: 511 09510630^ Single number A〇101 Page 9/Total 14 page 1013049416-0