201039022 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種背光模組’且特別是有關於一種 具有點光源之背光模組。 【先前技術】 請參照第1圖，其係繪示傳統背光模組之部分剖面 圖。背光模組1〇〇主要包括導光板102與光源模組1〇8， 〇 其中光源模組108設置在導光板102的一侧旁。光源模組 108主要係由數個發光二極體元件11〇所組成，其中這些 發光二極體元件110通常設置在電路板（未繪示）之表面 上。在光源模組108中’每個發光二極體元件110於鄰近 導光板102之一侧均具有出光面112。導光板102鄰近於 光源模組108之一侧具有入光面104，且導光板102之與 入光面104相鄰的一側具有出光面1〇6，其中導光板ι〇2 之出光面106位在導光板102之正面。每個發光二極體元 Ο 件110之出光面I12與導光板之入光面1〇4相面對， 且發光二極體元件110之出光面112與導光板102之入光 面104緊靠。發光二極體元件11〇所發出之光114自其出 光面112出射並經由導光板102之入光面1〇4進入導光板 102 中。 然而，由於發光二極體元件11〇為點光源，再加上發 光二極體元件11G所發出之幻14 t，㈣鄰近於導光板 102之入光面1()4的那-觸光對於導光板⑽之出光面 106的入射角度較小’因此並不會在導光板1〇2之出光面 201039022 106產生全反射而係直接自導光板1〇2之出光面折射 而出。如此一來，在背光模組1〇〇中，接近發光二極體元 件110之處較亮’而在二發光二極體元件11()之間的區域 較暗’這樣的現象一般稱為亮點波紋(H〇t Spot Mura)。亮 點波紋會影響背光模組100所提供之光源的均勻度，進而 會降低顯示品質。 針對亮點現象，目前常見的解決方式係採用光罩或膠 框來遮蔽亮度不均勻的區域。但是，這樣的方式會增加可 0 視區至背光模組邊緣之間的緣額區的寬度，而不利於目前 背光模組的小型化設計。另一種解決亮點現象的方法是將 發光二極體元件110與導光板102之間的距離拉開，以使 發光二極體元件110所發出之光114在尚未進入導光板102 之前先行混光。雖然將發光二極體元件110之出光面112 與導光板102之入光面104之間的距離拉開，可稍微改善 背光模組100之亮點波紋現象，但不僅會增加背光模組100 之外型尺寸，不利於小型化的裝置設計，更會降低背光模 q 組100之發光效率。 目前更有另一種解決亮點現象的方式係藉由縮減光源 模組之發光二極體元件110的間距(Pitch)，以透過增加發 光二極體元件11〇之設置密度來改善亮點波紋。然而’縮 減發光二極體元件11〇之間距的方式會導致背光模組100 之成本提高’並非良好的解決方式。 【發明内容】 因此’本發明之目的就是在提供一種背光模組及其在 4 201039022 液晶顯示器上的應用’其導光板之入光面的上下二侧具有 傾斜面’而可增加導光板之入光側對光的全反射能力，進 而可將從導光板之入光侧進入的光往前方傳遞，故可提高 背光模組之光效率’進而可提升液晶顯示器之顯示品質。 本發明之另一目的是在提供一種背光模組及其在液晶 顯不上的應用’其導光板之入光面中凹設有至少一凹 面’可立即改變進入入光面之光的行進方向，藉以使亮點 (HotSpot)現象提前出現，因此可使亮點現象往導光板之外 侧移動，而可縮減導光板之非可視區的寬度，進而可縮減 ® 背光模組之尺寸與重量，使液晶顯示器達到輕薄短小化。 根據本發明之上述目的，提出一種背光模組及其在液 晶顯示器上的應用，此液晶顯示器至少包括：一液晶面板、 以及一背光模組設於液晶面板之背面。其中，此背光模組 至少包括：一導光板至少包括：一入光面位於導光板之一 側；以及二傾斜面位於導光板之此側且分別鄰接在入光面 之相對二側，其中每一傾斜面與入光面之間具有一夾角， 且夾角介於實質30度與實質75度之間；以及至少一光源 〇 模組設於導光板之此侧旁。 根據本發明之目的，提出一種背光模組及其在液晶顯 不器上的應用，此液晶顯示器至少包括·一液晶面板、以 及一背光模組設於液晶面板之背面。其中，此背光模組至 少包括：一導光板，至少包括：一入光面位於導光板之一 侧；以及至少一凹面凹設於入光面中’其中此凹面至少包 括二狐形區分別位於凹面之上端與下端’且每一弧形區具 有一曲率半徑；以及至少一光源模組設於導光板之凹面旁。 201039022 【實施方式】 請參照第2圖’其係繪示依照本發明一較佳實施例的 一種液晶顯示器之組裝系統圖。在一示範實施例中，液晶 顯示器200主要包括液晶面板2〇2與背光模組2〇4，其中 背光模組204設置在液晶面板2〇2之背面，以在液晶面板 204之背面提供光源。背光模組2〇4主要包括導光板212a 與一或多個光源模組208，其中光源模組208設置在導光 板212a之1 一侧旁。光源模組208可例如為發光二極體光條 (LED Light Bar)，且光源模組208 —般包括數個發光二極 體元件220 ’其中每個發光二極體元件220具有出光面 222’而每個發光二極體元件220所發出之光係從此出光面 222發射而出。 在一實施例中，背光模組204可依實際產品需求，而 選擇性地包括有背板206，其中此背板206可為框狀結構 或板狀結構，且導光板212a與光源模組208均係設置在背 板206之上。在另一實施例中，背光模組204可依實際產 品需求而選擇性地包括有反射片210,其中反射片210設 置在導光板212a之底面下，以將光朝導光板212a之頂面 反射。此外，背光模組204更可選擇性地包括膠框214， 其中此膠框214圍設在導光板212a之上緣上，以利固定導 光板212a。在又一些實施例中，背光模組204亦可選擇性 地包括至少一光學膜片，例如增亮膜216與擴散膜218， 其中這些光學膜片設置在導光板212a之上，以提升背光模 組204之光學表現。 6 201039022 請參照第3圖’導光板212a具有入光面224a，其中此 入光面224a位於導光板212a之一侧，且光源模組208之 發光二極體元件220之出光面222均與導光板212a之入光 面224a相面對。在第一示範實施例中，導光板212a更具 有二傾斜面226，其中這些傾斜面226與入光面224a位於 導光板212a之同一侧’且此二傾斜面226分別鄰接在入光 面224a之相對二側，此二傾斜面226較佳係分別鄰接在入 光面224a之上侧與下侧。傾斜面226與入光面224a之間 具有夾角0 ’其中此夾角0可介於實質3〇度與實質75度 ϋ之間。 如第3圖所示’由於導光板212a之入光面224a的上 下二側分別設有傾斜面226，因此當發光二極體元件222 所發出之光232射向鄰接於入光面224a的傾斜面226時， 光232對於傾斜面226之入射角較大，而可能超過產生全 反射時的角度’如此一來，射向傾斜面226之光232會產 生全反射，而遭傾斜面226朝前方之導光板212a内部的方 向反射。故，藉由傾斜面226的設計，不僅可有效改善光 ® 源模組208之發光二極體元件220所造成的亮點現象，更 可降低光232在非可視區即射出導光板212a並形成亮點的 情況，而可將光232朝導光板212a之可視區傳導，進而可 提升光取出效率。 在本發明中，背光模組204之導光板212a可以下列其 他型式的導光板，例如導光板212b、212c、212d、與212e 來取代。 請參照第4圖，其係繪示依照本發明之第二較佳實施 201039022 例的一種背光模組之局部剖面示意圖。在本示範實施例 中，背光模組之導光板212b具有入光面224b與凹面228， 其中此凹面228係凹設在入光面224b之中，而背光模組之 光源模組208則係設置在導光板212b的凹面228旁。凹面 228具有至少二弧形區230,其中此二弧形區230分別位於 凹面228之上端與下端。在一示範實施例中，凹面228之 弧形區230的曲率半徑可介於實質〇.3mm與實質〇.7mm之 間。 請一併參照第4圖與第4A圖，在一實施例中，導光 〇 板2121)之入光面224b僅設有一凹面228,其中此凹面228 延伸而橫貫於整個入光面224b，如第4A圖所示。而且， 光源模組208中的每個發光二極體元件220的出光面222 均與導光板212b的凹面228相面對，其中凹面228之範圍 涵蓋所有發光二極體元件220之出光面222，因而凹面228 完全遮覆住這些出光面222。在另一實施例中，此凹面228 可具有另外二個弧形區（未繪示）分別設置在凹面228之左 端與右端，其中另外的這二個弧形區之曲率半徑可介於實 〇 質〇.3mm與實質〇.7mm之間。 如第4圖所示，由於導光板212b之入光面224b設有 凹面228，且至少於凹面228之上下二端設有弧形區230， 因此當發光二極體元件222所發出之光232射向凹面228 之弧形區230時’弧形區230對光232產生發散作用而改 變光232的行進方向，因而光232會較原來的行進方向朝 外偏移，如此一來，射向凹面228之弧形區230的光232 會在較鄰近於導光板212b之入光面224b的區域自導光板 201039022 212b的出光面234出射。故，藉由導光板212b之入光面 224b中的凹面228設計，可使導光板212b的亮點現象提 前出現在較鄰近於導光板212b之入光面224b的出光面234 區域上，因此可使亮點現象往導光板212b的外侧移動，而 可縮減導光板212b之非可視區的寬度，進而可縮減背光模 紐之尺寸與重量’並可使液晶顯示器達到輕薄短小化。 在另一實施例中，導光板之入光面可設置多個凹面來 與光源模組208的多個發光二極體元件220對應。請參照 ❹ 第4B圖，在此示範實施例中，背光模組之導光板212c之 入光面224c設有多個凹面228a，其中這些凹面228a分別 與光源模組208之發光二極體元件220的出光面222相面 對且母個凹面228a之範圍涵蓋對應之發光二極體元件 220的出光面222 ’因而每個凹面228a完全遮覆住對應之 出光面222，如同第4圖所示之導光板212b的凹面228完 全遮覆住出光面222般。 在一實施例中，凹面228a具有至少二弧形區23〇a，其 Q 中此一弧形區230a分別位於凹面228a之上端與下端。在 本示範實施例中，每個凹面228a具有四個弧形區230a，其 中這些弧形區230a分別位於凹面228a之上下二端與左右 一^ ’如第4B圖所示。每個凹面228a之弧形區230a的曲 率半徑可介於實質〇.3mm與實質〇.7mm之間。 請參照第5圖，其係繪示依照本發明之第四較佳實施 例的一種背光模組之局部剖面示意圖。在本示範實施例 中’背光模組之導光板212d具有入光面224d、二傾斜面 226與凹面228。其中，這些傾斜面226與入光面224d位 9 201039022 於導光板212d之同一側，且此二傾斜面226分別鄰接在入 光面224d之相對二侧，此二傾斜面226較佳係分別鄰接在 入光面224d之上侧與下側。傾斜面226與入光面224d之 間具有夾角0，其中此夾角0可介於實質3〇度與實質75 度之間。另一方面，凹面228則凹設在入光面224d之中， 而背光模組之光源模組208則係設置在導光板2i2d的凹面 228旁。凹面228具有至少二弧形區23〇，其中此二弧形區 230分別位於凹面228之上端與下端。在一示範實施例中， 凹面228之弧形區230的曲率半徑可介於實質〇,3mm與實 ϋ 質0.7mm之間。 凊一併參照第5圖與第5A圖，在一實施例中，導光 板212d之入光面224d僅設有一凹面228，其中此凹面228 延伸而橫貫於整個入光面224d，且二傾斜面226分別延伸 在凹面228之上下二侧，如第5A圖所示。光源模組2〇8 中的每個發光二極體元件220的出光面222均與導光板 212d的凹面228相面對，其中凹面228完全遮覆住這些出 ◎ 光面222。在另一實施例中，此凹面228可具有另外二個 弧形區（未繪示）分別設置在凹面228之左端與右端，其中 另外的這二個弧形區之曲率半徑可介於實質〇 3min與實質 0.7mm之間。 在另一實施例中，導光板之入光面可設置多個凹面來 與光源模組208的多個發光二極體元件220對應。請參照 第5B圖’在此示範實施例中，背光模組之導光板2i2e之 入光面224e設有多個凹面228a，其中這些凹面228a分別 • 與光源模組208之發光二極體元件220的出光面222相面 201039022 對’且每個凹面228a完全遮覆住對應之出光面222，如同 第5圖所示之導光板212d的凹面228完全遮覆住出光面 222 般。 在一實施例中，凹面228a具有至少二弧形區230a，其 中此二弧形區230a分別位於凹面228a之上端與下端。在 本示範實施例中’每個凹面228a具有四個弧形區230a，其 中這些弧形區230a分別位於凹面228a之上下二端與左右 一端’如弟5B圖所示。每個凹面228a之弧形區230a的曲 & 率半徑可介於實質0.3mm與實質〇.7mm之間。 請參照第6A圖’其係繪示傳統導光板之亮度分布曲 線圖。第6A圖之圖形236為導光板上之亮度分布圖，圖 形238為沿者圖形236之縱轴AA’所獲得之亮度強度曲 線，而圖形240則為沿著圖形236之橫軸BB，所獲得之亮 度強度曲線。在第6A圖中，由縱向亮度分布的圖形238 可看出導光板之橫向亮度分布存在有相當明顯的起伏，再 由橫向亮度分布的圖形240可看出導光板在圖形236之縱 〇 軸AA’上的亮度明顯較高，再搭配導光板上之亮度分布圖 形236，可看出傳統導光板之亮點現象相當明顯。 請參照第6B圖’其係繪示在導光板具有二傾斜面鄰接 在入光面之上下二側，且傾斜面與入光面之夾角為45度的 情況下，所獲得之亮度分布曲線圖。第6B圖之圖形242 為導光板上之壳度分布圖’圖形244則為沿著圖形242之 縱轴AA’所獲得之亮度強度曲線，而圖形246為沿著圖形 242之橫軸BB’所獲得之亮度強度曲線。在第6B圖中，在 導光板具有二傾斜面鄰接在入光面之上下二侧，且傾斜面 201039022 與入光面之夾角為45度的情況下，由圖形246可看出，導 光板之橫向亮度分布的起伏已較傳統導光板平緩，因此在 此種狀況下亮線現象已獲得改善。另外，由亮度分布圖形 242與圖形244之縱向亮度分布可看出導光板仍存在有輕 微之亮點現象，但其亮度較傳統導光板高。 〇 〇 請參照第6C圖’其係讀'示在導光板具有二傾斜面鄰接 在入光面之上下二侧，且傾斜面與入光面之夾角為71.1度 的情況下，所獲得之亮度分布曲線圖。第6C圖之圖形248 為導光板上之亮度分布圖，圖形250則為沿著圖形248之 縱軸AA’所獲得之亮度強度曲線，而圖形252為沿著圖形 248之橫轴BB’所獲得之亮度強度曲線。在第6C圖中，在 導光板具有二傾斜面鄰接在入光面之上下二侧，且傾斜面 與入光面之夾角為71.1度的情況下，由圖形252可看出， 導光板之橫向亮度分布的起伏較傳統導光板更為平緩，因 此在此種狀況下亮線現象已獲得有效改善。另外，由亮度 分布圖形248與圖形250之縱向亮度分布可看出導光板的 亮點現象已獲得大幅改善，且其亮度較傳統導光板和傾斜 面與入光面之夾角為45度的導光板高。 請翏照第6D圖 /丨、守兀^汉·<►八尤囬設有凹面 且凹面之㈣區的料半徑為Q.4mm的情況下，所獲得之 亮度分布曲線圖。帛6D圖之圖形254為導光板上之亮戶 分布圖’圖形256則為沿著_ 254之縱軸AA，所獲得^ 線’而圖形258為沿著圖形25 =度強度曲線。在第6D圖中，當導光板之入光: ^ 丨凹面之弧形區的曲率半徑為〇.4mm的情況 201039022 下’由圖形254與258可看出’導光板之橫向亮度分布中 亮度最大的區域朝導光板之外側偏移，且此亮度較傳統導 光板之凴度低，因此在此種狀況下亮點現象往導光板外侧 偏移且亮點現象減輕。另外，由圖形256之縱向亮度分布 可看出導光板之亮線現象大幅減輕。 晴參照第6Ε圖 日|γ〜队〜八光面設有凹面， 且凹面之弧形區的料半徑為G.8mm的情況下，所獲得之 2分=曲線圖。第6£圖之圖形26〇為導光板上之亮度分201039022 VI. Description of the Invention: [Technical Field] The present invention relates to a backlight module and particularly relates to a backlight module having a point source. [Prior Art] Please refer to Fig. 1, which is a partial cross-sectional view showing a conventional backlight module. The backlight module 1 〇〇 mainly includes a light guide plate 102 and a light source module 1 , 8 , wherein the light source module 108 is disposed beside one side of the light guide plate 102 . The light source module 108 is mainly composed of a plurality of light emitting diode elements 11 , wherein the light emitting diode elements 110 are generally disposed on a surface of a circuit board (not shown). In the light source module 108, each of the light-emitting diode elements 110 has a light-emitting surface 112 on one side of the adjacent light-guide plate 102. The light guide plate 102 has a light incident surface 104 adjacent to one side of the light source module 108, and a side of the light guide plate 102 adjacent to the light incident surface 104 has a light emitting surface 1〇6, wherein the light emitting surface 106 of the light guide plate ι2 Located on the front side of the light guide plate 102. The light-emitting surface I12 of each of the light-emitting diode elements 110 faces the light-incident surface 1〇4 of the light guide plate, and the light-emitting surface 112 of the light-emitting diode element 110 is in close contact with the light-incident surface 104 of the light guide plate 102. . The light 114 emitted from the light-emitting diode element 11 is emitted from the light-emitting surface 112 and enters the light-guide plate 102 via the light-incident surface 1〇4 of the light guide plate 102. However, since the light emitting diode element 11 is a point light source, plus the illusion 14 t emitted by the light emitting diode element 11G, (4) the light contact adjacent to the light incident surface 1 () 4 of the light guide plate 102 is The incident angle of the light-emitting surface 106 of the light guide plate (10) is small, so that it does not cause total reflection on the light-emitting surface 201039022 106 of the light guide plate 1〇2 and is directly refracted from the light-emitting surface of the light guide plate 1〇2. As a result, in the backlight module 1 ,, the phenomenon that the light-emitting diode element 110 is brighter and the area between the two light-emitting diode elements 11 (the darker portion is darker) is generally called a bright spot. Rust (H〇t Spot Mura). The bright ripples affect the uniformity of the light source provided by the backlight module 100, which in turn degrades the display quality. For the bright spot phenomenon, the current common solution is to use a mask or a plastic frame to shield the uneven brightness area. However, such a method increases the width of the margin area between the 0 viewport and the edge of the backlight module, which is disadvantageous for the miniaturization design of the current backlight module. Another way to solve the bright spot phenomenon is to pull apart the distance between the light-emitting diode element 110 and the light guide plate 102 so that the light 114 emitted from the light-emitting diode element 110 is mixed before it enters the light guide plate 102. Although the distance between the light-emitting surface 112 of the light-emitting diode element 110 and the light-incident surface 104 of the light guide plate 102 is pulled apart, the bright spot ripple phenomenon of the backlight module 100 can be slightly improved, but not only the backlight module 100 is added. The size of the device is not conducive to miniaturized device design, and the luminous efficiency of the backlight module q group 100 is further reduced. There is another way to solve the bright spot phenomenon by reducing the pitch of the light-emitting diode elements 110 of the light source module to improve the bright spot ripple by increasing the density of the light-emitting diode elements 11 . However, the manner in which the distance between the LED elements 11 is reduced can result in an increase in the cost of the backlight module 100, which is not a good solution. SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a backlight module and its application on the liquid crystal display of 4 201039022, which has an inclined surface on the upper and lower sides of the light incident surface of the light guide plate, thereby increasing the entrance of the light guide plate. The total reflection capability of the light side to the light can further transmit the light entering from the light incident side of the light guide plate to the front, thereby improving the light efficiency of the backlight module, thereby improving the display quality of the liquid crystal display. Another object of the present invention is to provide a backlight module and its application in liquid crystal display, wherein at least one concave surface is recessed in the light incident surface of the light guide plate to immediately change the traveling direction of light entering the light incident surface. In order to make the highlight phenomenon (HotSpot) appear in advance, the bright spot phenomenon can be moved to the outside of the light guide plate, and the width of the non-visible area of the light guide plate can be reduced, thereby reducing the size and weight of the backlight module, so that the liquid crystal display Achieve light and thin. According to the above object of the present invention, a backlight module and an application thereof to a liquid crystal display are provided. The liquid crystal display includes at least: a liquid crystal panel, and a backlight module disposed on a back surface of the liquid crystal panel. The backlight module includes at least: a light guide plate comprising: a light incident surface on one side of the light guide plate; and two inclined surfaces on the side of the light guide plate and respectively adjacent to opposite sides of the light incident surface, wherein each An angle between the inclined surface and the light incident surface is between an angle of substantially 30 degrees and substantially 75 degrees; and at least one light source module is disposed beside the side of the light guide plate. In accordance with the purpose of the present invention, a backlight module and its use in a liquid crystal display are provided. The liquid crystal display includes at least a liquid crystal panel and a backlight module disposed on the back surface of the liquid crystal panel. The backlight module includes at least: a light guide plate, comprising: at least one light incident surface is located on one side of the light guide plate; and at least one concave surface is recessed in the light incident surface, wherein the concave surface includes at least two fox-shaped regions respectively located The upper end and the lower end of the concave surface have a radius of curvature; and at least one light source module is disposed beside the concave surface of the light guide plate. [Embodiment] Please refer to FIG. 2, which is a diagram showing an assembly system of a liquid crystal display according to a preferred embodiment of the present invention. In an exemplary embodiment, the liquid crystal display 200 mainly includes a liquid crystal panel 2〇2 and a backlight module 2〇4, wherein the backlight module 204 is disposed on the back surface of the liquid crystal panel 2〇2 to provide a light source on the back surface of the liquid crystal panel 204. The backlight module 2〇4 mainly includes a light guide plate 212a and one or more light source modules 208, wherein the light source module 208 is disposed beside the one side of the light guide plate 212a. The light source module 208 can be, for example, a LED light bar, and the light source module 208 generally includes a plurality of light emitting diode elements 220 ′ each of which has a light emitting surface 222 ′ The light emitted by each of the light-emitting diode elements 220 is emitted from the light-emitting surface 222. In one embodiment, the backlight module 204 can optionally include a backplane 206 according to actual product requirements. The backplane 206 can be a frame structure or a plate structure, and the light guide plate 212a and the light source module 208. Both are disposed above the backing plate 206. In another embodiment, the backlight module 204 can selectively include a reflective sheet 210 according to actual product requirements, wherein the reflective sheet 210 is disposed under the bottom surface of the light guide plate 212a to reflect the light toward the top surface of the light guide plate 212a. . In addition, the backlight module 204 further includes a plastic frame 214, wherein the plastic frame 214 is disposed on the upper edge of the light guide plate 212a to facilitate the fixing of the light guide plate 212a. In still other embodiments, the backlight module 204 can also optionally include at least one optical film, such as a brightness enhancement film 216 and a diffusion film 218, wherein the optical film is disposed on the light guide plate 212a to enhance the backlight mode. Optical representation of group 204. 6 201039022 Please refer to FIG. 3 'The light guide plate 212a has a light incident surface 224a, wherein the light incident surface 224a is located on one side of the light guide plate 212a, and the light emitting surface 222 of the light emitting diode element 220 of the light source module 208 is guided. The light incident surface 224a of the light plate 212a faces each other. In the first exemplary embodiment, the light guide plate 212a further has two inclined surfaces 226, wherein the inclined surfaces 226 and the light incident surface 224a are located on the same side of the light guide plate 212a, and the two inclined surfaces 226 are respectively adjacent to the light incident surface 224a. Preferably, the two inclined surfaces 226 are respectively adjacent to the upper side and the lower side of the light incident surface 224a. The inclined surface 226 and the light incident surface 224a have an angle of 0', wherein the angle 0 can be between substantially 3 degrees and substantially 75 degrees. As shown in FIG. 3, since the upper and lower sides of the light incident surface 224a of the light guide plate 212a are respectively provided with inclined surfaces 226, the light 232 emitted from the light emitting diode element 222 is incident on the tilt adjacent to the light incident surface 224a. At face 226, the angle of incidence of light 232 with respect to inclined surface 226 is greater, and may exceed the angle at which full reflection occurs. Thus, light 232 directed toward inclined surface 226 will produce total reflection, with inclined surface 226 facing forward. The direction inside the light guide plate 212a is reflected. Therefore, the design of the inclined surface 226 can not only effectively improve the bright spot phenomenon caused by the light emitting diode element 220 of the light source module 208, but also reduce the light 232 in the non-visible area, that is, the light guiding plate 212a and form a bright spot. In this case, the light 232 can be conducted toward the visible area of the light guide plate 212a, thereby improving the light extraction efficiency. In the present invention, the light guide plate 212a of the backlight module 204 can be replaced by other types of light guide plates, such as the light guide plates 212b, 212c, 212d, and 212e. Please refer to FIG. 4, which is a partial cross-sectional view showing a backlight module according to a second preferred embodiment of the present invention. In the exemplary embodiment, the light guide plate 212b of the backlight module has a light incident surface 224b and a concave surface 228, wherein the concave surface 228 is recessed in the light incident surface 224b, and the light source module 208 of the backlight module is disposed. Beside the concave surface 228 of the light guide plate 212b. Concave surface 228 has at least two arcuate regions 230, wherein the two arcuate regions 230 are located at the upper and lower ends of concave surface 228, respectively. In an exemplary embodiment, the radius of curvature of the arcuate region 230 of the concave surface 228 may be between substantially 〇3 mm and substantially 〇.7 mm. Referring to FIG. 4 and FIG. 4A together, in an embodiment, the light incident surface 224b of the light guide plate 2121) is provided with only a concave surface 228, wherein the concave surface 228 extends across the entire light incident surface 224b, such as Figure 4A shows. Moreover, the light-emitting surface 222 of each of the light-emitting diode elements 220 of the light source module 208 faces the concave surface 228 of the light guide plate 212b, wherein the concave surface 228 covers the light-emitting surface 222 of all the light-emitting diode elements 220. Thus, the concave surface 228 completely covers the light-emitting surfaces 222. In another embodiment, the concave surface 228 may have two other curved regions (not shown) respectively disposed at the left end and the right end of the concave surface 228, wherein the curvature radius of the other two curved regions may be different. 〇.3mm and the essence 〇.7mm. As shown in FIG. 4, since the light incident surface 224b of the light guide plate 212b is provided with a concave surface 228, and at least the upper end of the concave surface 228 is provided with an arcuate region 230, the light 232 emitted by the light emitting diode element 222 is provided. When the arcuate region 230 of the concave surface 228 is incident, the arcuate region 230 diverges from the light 232 to change the direction of travel of the light 232, so that the light 232 is deflected outwardly from the original direction of travel, thus, toward the concave surface. The light 232 of the curved region 230 of 228 will exit from the light exit surface 234 of the light guide plate 201039022 212b in a region closer to the light incident surface 224b of the light guide plate 212b. Therefore, by designing the concave surface 228 in the light incident surface 224b of the light guide plate 212b, the bright spot phenomenon of the light guide plate 212b can be preliminarily appeared on the light exit surface 234 adjacent to the light incident surface 224b of the light guide plate 212b, thereby The bright spot phenomenon moves to the outside of the light guide plate 212b, and the width of the non-visible area of the light guide plate 212b can be reduced, thereby reducing the size and weight of the backlight mold and making the liquid crystal display light and thin. In another embodiment, the light incident surface of the light guide plate may be provided with a plurality of concave surfaces to correspond to the plurality of light emitting diode elements 220 of the light source module 208. Referring to FIG. 4B, in the exemplary embodiment, the light incident surface 224c of the light guide plate 212c of the backlight module is provided with a plurality of concave surfaces 228a, wherein the concave surfaces 228a are respectively associated with the light emitting diode elements 220 of the light source module 208. The light-emitting surface 222 faces and the range of the female concave surface 228a covers the light-emitting surface 222' of the corresponding light-emitting diode element 220. Thus, each concave surface 228a completely covers the corresponding light-emitting surface 222, as shown in FIG. The concave surface 228 of the light guide plate 212b completely covers the light exit surface 222. In one embodiment, the concave surface 228a has at least two arcuate regions 23a, wherein the arcuate regions 230a of the Q are located at the upper and lower ends of the concave surface 228a, respectively. In the exemplary embodiment, each concave surface 228a has four arcuate regions 230a, wherein the arcuate regions 230a are respectively located at the lower two ends and the left and right sides of the concave surface 228a as shown in Fig. 4B. The radius of curvature of the arcuate region 230a of each concave surface 228a may be between substantially 〇3 mm and substantially 〇.7 mm. Referring to FIG. 5, a partial cross-sectional view of a backlight module in accordance with a fourth preferred embodiment of the present invention is shown. In the exemplary embodiment, the light guide plate 212d of the backlight module has a light incident surface 224d, two inclined surfaces 226 and a concave surface 228. The inclined surfaces 226 and the light incident surface 224d are located on the same side of the light guide plate 212d, and the two inclined surfaces 226 are respectively adjacent to opposite sides of the light incident surface 224d. The two inclined surfaces 226 are preferably adjacent to each other. On the upper side and the lower side of the light incident surface 224d. The angle between the inclined surface 226 and the light incident surface 224d is 0, wherein the angle 0 can be between substantially 3 degrees and substantially 75 degrees. On the other hand, the concave surface 228 is recessed in the light incident surface 224d, and the light source module 208 of the backlight module is disposed beside the concave surface 228 of the light guide plate 2i2d. The concave surface 228 has at least two arcuate regions 23, wherein the two arcuate regions 230 are located at the upper and lower ends of the concave surface 228, respectively. In an exemplary embodiment, the radius of curvature of the arcuate region 230 of the concave surface 228 may be between substantially 〇, 3 mm and solid 0.7 0.7 mm. Referring to FIG. 5 and FIG. 5A together, in an embodiment, the light incident surface 224d of the light guide plate 212d is provided with only one concave surface 228, wherein the concave surface 228 extends across the entire light incident surface 224d and has two inclined surfaces. 226 extend over the lower two sides of the concave surface 228, respectively, as shown in FIG. 5A. The light-emitting surfaces 222 of each of the light-emitting diode elements 220 are facing the concave surface 228 of the light guide plate 212d, wherein the concave surface 228 completely covers the light-emitting surfaces 222. In another embodiment, the concave surface 228 may have two other curved regions (not shown) respectively disposed at the left end and the right end of the concave surface 228, wherein the curvature radius of the other two curved regions may be substantially 3min and substantial 0.7mm. In another embodiment, the light incident surface of the light guide plate may be provided with a plurality of concave surfaces to correspond to the plurality of light emitting diode elements 220 of the light source module 208. Referring to FIG. 5B, in the exemplary embodiment, the light incident surface 224e of the light guide plate 2i2e of the backlight module is provided with a plurality of concave surfaces 228a, wherein the concave surfaces 228a are respectively associated with the light emitting diode elements 220 of the light source module 208. The light-emitting surface 222 faces 201039022 pairs and each concave surface 228a completely covers the corresponding light-emitting surface 222, as the concave surface 228 of the light guide plate 212d shown in FIG. 5 completely covers the light-emitting surface 222. In one embodiment, the concave surface 228a has at least two arcuate regions 230a, wherein the two arcuate regions 230a are respectively located at the upper and lower ends of the concave surface 228a. In the exemplary embodiment, each of the concave surfaces 228a has four arcuate regions 230a, wherein the arcuate regions 230a are respectively located at the lower two ends and the left and right ends of the concave surface 228a as shown in Fig. 5B. The radius of the curved portion 230a of each concave surface 228a may be between substantially 0.3 mm and substantially 〇.7 mm. Please refer to Fig. 6A' for the brightness distribution curve of the conventional light guide plate. The graph 236 of FIG. 6A is a luminance distribution map on the light guide plate, the graph 238 is a luminance intensity curve obtained along the longitudinal axis AA' of the graph 236, and the graph 240 is obtained along the horizontal axis BB of the graph 236. Brightness intensity curve. In Fig. 6A, it can be seen from the pattern 238 of the longitudinal luminance distribution that there is considerable undulation of the lateral luminance distribution of the light guide plate, and the pattern 240 of the lateral luminance distribution can be seen that the light guide plate is at the longitudinal axis AA of the pattern 236. 'The brightness on the upper side is obviously higher, and then the brightness distribution pattern 236 on the light guide plate is used to show that the bright spot phenomenon of the conventional light guide plate is quite obvious. Please refer to FIG. 6B, which is a graph showing the brightness distribution obtained when the light guide plate has two inclined surfaces adjacent to the lower side of the light incident surface and the angle between the inclined surface and the light incident surface is 45 degrees. . Figure 242 of Figure 6B is a shell profile of the light guide plate. The graph 244 is a luminance intensity curve obtained along the longitudinal axis AA' of the graph 242, and the graph 246 is along the transverse axis BB' of the graph 242. The brightness intensity curve obtained. In FIG. 6B, in the case where the light guide plate has two inclined surfaces adjacent to the lower two sides of the light incident surface, and the angle between the inclined surface 201039022 and the light incident surface is 45 degrees, as can be seen from the pattern 246, the light guide plate The fluctuation of the lateral brightness distribution has been flatter than that of the conventional light guide plate, so the bright line phenomenon has been improved under such conditions. In addition, from the longitudinal brightness distribution of the brightness distribution pattern 242 and the pattern 244, it can be seen that the light guide plate still has a slight bright spot phenomenon, but its brightness is higher than that of the conventional light guide plate.参照Please refer to Fig. 6C's 'Reading' to show the brightness obtained when the light guide plate has two inclined surfaces adjacent to the lower side of the light incident surface and the angle between the inclined surface and the light incident surface is 71.1 degrees. Distribution curve. The graph 248 of Fig. 6C is a luminance distribution map on the light guide plate, the graph 250 is a luminance intensity curve obtained along the longitudinal axis AA' of the graph 248, and the graph 252 is obtained along the horizontal axis BB' of the graph 248. Brightness intensity curve. In Fig. 6C, in the case where the light guide plate has two inclined surfaces adjacent to the lower two sides of the light incident surface, and the angle between the inclined surface and the light incident surface is 71.1 degrees, as shown by the pattern 252, the lateral direction of the light guide plate The fluctuation of the brightness distribution is more gradual than that of the conventional light guide plate, so the bright line phenomenon has been effectively improved under such conditions. In addition, from the longitudinal brightness distribution of the brightness distribution pattern 248 and the pattern 250, it can be seen that the bright spot phenomenon of the light guide plate has been greatly improved, and the brightness thereof is higher than that of the conventional light guide plate and the light guide plate having an angle of 45 degrees between the inclined surface and the light incident surface. . Please refer to the 6D/丨, 守兀^汉·<► 八尤回回面面面面面面面面面面面面面面面。 The graph 254 of the 帛6D graph is the brighter distribution map on the light guide plate. The graph 256 is the vertical axis AA along _254, and the graph 258 is along the graph 25 = degree intensity curve. In Fig. 6D, when the light entering the light guide plate: ^ The radius of curvature of the curved area of the concave surface is 〇.4 mm under the condition of 201039022, 'It can be seen from the figures 254 and 258' that the brightness of the lateral brightness distribution of the light guide plate is the largest. The area is offset toward the outer side of the light guide plate, and the brightness is lower than that of the conventional light guide plate. Therefore, in this case, the bright spot phenomenon is shifted to the outside of the light guide plate and the bright spot phenomenon is alleviated. In addition, it can be seen from the longitudinal luminance distribution of the pattern 256 that the bright line phenomenon of the light guide plate is greatly reduced. Clear reference to Fig. 6 Day | γ ~ team ~ 八光面 has a concave surface, and the radius of the concave curved area is G. 8mm, the obtained 2 points = graph. Figure 26 of Figure 6 is the brightness of the light guide
Ο 圖形264為沿_2^ 付之党度強度曲線。在第6E圖中，當邋 又 凹面，且凹面以㈣㈣率半徑為（^板^光面設有 圖形·可看出此種情況下之亮點現情況下’由 曲率半徑為〇.4_的導光板義=之弧形區的 板之橫向亮度分布中真产畏大的「仏圖％ 264可看出導光 移，但向外偏移_:不1凹==外側偏 r::的導光板大，且此亮度較凹面 二k.:的導光板大，因此在此種m亮點現象往導光 夕貝’移且亮點現象減輕，但亮點現象較凹 的曲率半徑為〇.4mm的導光板明顯。另夕卜，由圖形 ㈣亮^材看料絲之聽現象雖有減輕但較凹= 之孤形區的曲率半徑為〇.4mm料紐明顯。 在入卵圖’其係綠示在導光板具有二傾斜面鄰接 同時入光面設下有二侧，且傾斜面與入光面之央角為45度， 又有凹面，且凹面之弧形區的曲率半徑為 13 201039022图形 Graph 264 is the party strength curve paid along _2^. In Fig. 6E, when the 邋 is concave and concave, and the concave surface has a radius of (4) (four) rate (^ plate ^ light surface is provided with a pattern, it can be seen that the bright spot in this case is now 'by the radius of curvature 〇.4_ The lateral brightness distribution of the plate in the arc area of the light guide plate = true 畏 的 的 仏 % % 264 264 264 264 264 264 , , , , 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外 向外The light guide plate is large, and the brightness is larger than that of the light guide plate with a concave surface of two k.: Therefore, in the case of the m bright point phenomenon, the light guide is shifted and the bright spot phenomenon is alleviated, but the bright spot phenomenon has a concave radius of curvature of 〇.4 mm. The light guide plate is obvious. In addition, the sound phenomenon of the wire is reduced by the graphic (4) bright material, but the radius of curvature of the orphan zone is more obvious. The radius of curvature of the orphan zone is 〇.4mm. It is shown that the light guide plate has two inclined faces adjacent to each other while the light incident surface is provided with two sides, and the central angle of the inclined surface and the light incident surface is 45 degrees, and has a concave surface, and the radius of curvature of the concave curved portion is 13 201039022
0.4mm的情況下，所獲得之亮度分布曲線圖。第6f圖之圖 形266為導光板上之亮度分布圖，圖形268則為沿著圖形 266之縱軸AA，所獲得之亮度強度曲線，而圖形27〇為沿著 圖形266之橫軸所獲得之亮度強度曲線。在第6F 中’在導光板具有二傾斜面鄰接在人光面之上下二侧，且 傾斜面與人光面之夾角為45度，同時人光面設有凹面，且 凹面之弧形區的曲率半彳I為的情況下，由圖形266 ” 270可看出，導光板之横向亮度分布的起伏明顯較傳 導光板平緩’㈣板之橫向亮度分布中亮度最大的區域朝 導光板之外侧偏移，且此亮度明顯低於傳統導光板之亮 度，因此在此種狀況下亮點現象往導光板外侧偏移且亮點U 現象獲得相當顯著的改善1外，由圖形之縱向亮户 分布可看出導紐H見象大幅減輕。 " 請參照第6G圖，其係繪示在導光板具有二傾斜面鄰The brightness distribution curve obtained in the case of 0.4 mm. The graph 266 of Fig. 6f is a luminance distribution map on the light guide plate, the graph 268 is the luminance intensity curve obtained along the longitudinal axis AA of the graph 266, and the graph 27 is obtained along the horizontal axis of the graph 266. Brightness intensity curve. In the 6F, the light guide plate has two inclined surfaces adjacent to the lower side of the human light surface, and the angle between the inclined surface and the human light surface is 45 degrees, and the human light surface is provided with a concave surface, and the curved surface of the concave surface is concave. In the case where the curvature half 彳I is, it can be seen from the pattern 266 ” 270 that the undulation of the lateral brightness distribution of the light guide plate is significantly flatter than that of the light guide plate. The area where the brightness is the largest in the lateral brightness distribution of the (four) plate is shifted toward the outside of the light guide plate. And the brightness is significantly lower than the brightness of the conventional light guide plate. Therefore, in this case, the bright spot phenomenon is shifted to the outside of the light guide plate and the bright point U phenomenon is considerably improved. New H sees a significant reduction. " Please refer to Figure 6G, which is shown on the light guide plate with two inclined faces
接在入光面之上下二侧’且傾斜面與人光面之夾角為7U 度同時入光面汉有凹面，且凹面之弧形區的曲率半徑 〇.8醒的情況下，所獲得之亮度分布曲線圖。第6G圖i 圖形272為導光板上之亮度分布圖，圖形274則為沿著圖 形獲得之亮度強度曲線，而圖形276為 ，所獲得之亮度強度曲線。在第6G 圖中在導先板具有二傾斜面鄰接在 且傾斜面與入光面之失角為711度，同時入光面設有丨凹 顯地較傳統導光:平出緩導==度分”起伏更明 V先板之向亮度分布中亮度最 201039022 大的區域朝導光板之更外側偏移，且此亮度更明顯低於傳 統導光板之亮度，因此在此種狀況下亮點現象更往導光板 外侧偏移且亮點現象獲得相當明顯的改善，亮點現象已 乎完全消除。另外，由圖形274之縱向亮度分布可看出導 光板之亮線現象已獲得更大幅的減輕。 由上述本發明之實施例可知，本發明之一優點就是因 為在本發明之背光模組及其在液晶顯示器上的應用中，其 導光板之入光面的上下二側具有傾斜面，而可增加導光板 ◎ 之入光侧對光的全反射能力，進而可將從導光板之入光側 進入的光往前方傳遞，因此可提高背光模組之光效率，進 而可提升液晶顯示器之顯示品質。 由上述本發明之實施例可知，本發明之另一優點就是 因為在本發明之背光模組及其在液晶顯示器上的應用中， 其導光板之入光面中凹設有至少一凹面，可立即改變進入 入光面之光的行進方向，藉以使亮點現象提前出現，因此 可使壳點現象往導光板之外侧移動，而可縮減導光板之非 ❹可視區的寬度，進而可縮減背光模組之尺寸與重量，使液 晶顯示器達到輕薄短小化。 雖然本發明已以實施例揭露如上，然其並非用以限定 本發明，任何在此技術領域中具有通常知識者，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申請專利範圍所界定者為 準0 【圖式簡單說明】 15 201039022 第1圖係繪示傳統背光模組之部分剖面圖。 第2圖係繪示依照本發明一較佳實施例的一種液晶顯 示器之組裝系統圖。 第3圖係繪示依照本發明之第一較佳實施例的一種背 光模組之局部剖面示意圖。 第4圖係繪示依照本發明之第二較佳實施例的一種背 光模組之局部剖面示意圖。 第4A圖係繪示依照本發明之第二較佳實施例的一種 0 背光模組之局部側面示意圖。 第4B圖係繪示依照本發明之第三較佳實施例的一種 背光模組之局部侧面示意圖。 第5圖係繪示依照本發明之第四較佳實施例的一種背 光模組之局部剖面示意圖。 第5A圖係繪示依照本發明之第四較佳實施例的一種 背光模組之局部侧面示意圖。 第5B圖係繪示依照本發明之第五較佳實施例的一種 〇 背光模組之局部侧面示意圖。 第6A圖係繪示傳統導光板之亮度分布曲線圖。 第6B圖係繪示在導光板具有二傾斜面鄰接在入光面 之上下二侧，且傾斜面與入光面之夾角為45度的情況下， 所獲得之亮度分布曲線圖。 第6C圖係繪示在導光板具有二傾斜面鄰接在入光面 之上下二側，且傾斜面與入光面之夾角為71.1度的情況 • 下，所獲得之亮度分布曲線圖。 16 201039022 第6D圖係繪示導光板之入光面設有凹面，且凹面之 弧形區的曲率半徑為0.4mm的情況下，所獲得之亮度分布 曲線圖。 第6E圖係繪示導光板之入光面設有凹面，且凹面之弧 形區的曲率半徑為0.8mm的情況下，所獲得之亮度分布曲 線圖。 第6F圖係繪示在導光板具有二傾斜面鄰接在入光面 之上下二側，且傾斜面與入光面之夾角為45度，同時入光 面設有凹面，且凹面之弧形區的曲率半徑為0.4mm的情況 〇 下，所獲得之亮度分布曲線圖。 第6G圖係繪示在導光板具有二傾斜面鄰接在入光面 之上下二側，且傾斜面與入光面之夾角為71.1度，同時入 光面設有凹面，且凹面之弧形區的曲率半徑為0.8mm的情 況下 ，所獲得之亮度分布曲線圖。 【主要元件符號說明】 100 背光模組 102 導光板 104 入光面 106 出光面 108 光源模組 110 發光二極體元件 112 出光面 114 光 200 液晶顯不 202 液晶面板 204 背光模組 206 背板 208 光源模組 210 反射片 212a :導光板 212b :導光板 212c :導光板 212d :導光板 17Connected to the lower side of the light-incident surface and the angle between the inclined surface and the human light surface is 7U degrees, and the concave surface of the concave surface is concave, and the radius of curvature of the concave curved surface is 醒.8, the obtained Brightness distribution graph. Fig. 6G is a graph 272 showing the brightness distribution on the light guide plate, the pattern 274 is the brightness intensity curve obtained along the pattern, and the pattern 276 is the obtained brightness intensity curve. In the 6G figure, the guide plate has two inclined faces adjacent to each other, and the angle of deviation between the inclined surface and the light incident surface is 711 degrees, and the light entrance surface is provided with a concave concave surface compared with the conventional light guide: the flat guide is == The degree of undulation is more pronounced. The brightness of the V-first plate is the most outward in the brightness distribution of 201039022, and the brightness is more significantly lower than that of the conventional light guide plate. Therefore, the brightness is brighter under such conditions. Further, the outer side of the light guide plate is offset and the bright spot phenomenon is considerably improved, and the bright spot phenomenon is completely eliminated. In addition, the longitudinal brightness distribution of the pattern 274 can be seen that the bright line phenomenon of the light guide plate has been more greatly reduced. According to an embodiment of the present invention, an advantage of the present invention is that, in the backlight module of the present invention and its application on a liquid crystal display, the upper and lower sides of the light incident surface of the light guide plate have inclined surfaces, and the guide can be increased. The light-reflecting ability of the light-emitting plate ◎ on the light-incident side can further transmit the light entering from the light-incident side of the light guide plate to the front, thereby improving the light efficiency of the backlight module and thereby improving the display of the liquid crystal display. According to the embodiment of the present invention, another advantage of the present invention is that in the backlight module of the present invention and its application in the liquid crystal display, at least one concave surface is recessed in the light incident surface of the light guide plate. , the direction of the light entering the light entrance surface can be changed immediately, so that the bright spot phenomenon appears in advance, so that the shell point phenomenon can be moved to the outer side of the light guide plate, and the width of the non-❹ visible area of the light guide plate can be reduced, thereby being reduced. The size and weight of the backlight module make the liquid crystal display light and thin. Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any person having ordinary knowledge in the technical field does not deviate from the present invention. Within the spirit and scope of the invention, the various modifications and refinements may be made, and the scope of protection of the present invention is defined by the scope of the appended claims. [Complete description of the drawings] 15 201039022 The first figure shows A partial cross-sectional view of a conventional backlight module. Fig. 2 is a view showing an assembly system of a liquid crystal display according to a preferred embodiment of the present invention. FIG. 4 is a partial cross-sectional view showing a backlight module according to a second preferred embodiment of the present invention. FIG. 4A is a cross-sectional view showing a backlight module according to a second preferred embodiment of the present invention. A partial side view of a backlight module in accordance with a second preferred embodiment of the present invention is shown in FIG. 4B. FIG. 4B is a partial side elevational view of a backlight module in accordance with a third preferred embodiment of the present invention. 5 is a partial cross-sectional view showing a backlight module according to a fourth preferred embodiment of the present invention. FIG. 5A is a partial side view of a backlight module according to a fourth preferred embodiment of the present invention. 5B is a partial side view showing a 〇 backlight module according to a fifth preferred embodiment of the present invention. FIG. 6A is a graph showing a brightness distribution curve of a conventional light guide plate. The brightness distribution curve obtained when the light guide plate has two inclined surfaces adjacent to the lower side of the light incident surface and the angle between the inclined surface and the light incident surface is 45 degrees. Fig. 6C is a graph showing the brightness distribution obtained when the light guide plate has two inclined surfaces adjacent to the lower side of the light incident surface and the angle between the inclined surface and the light incident surface is 71.1 degrees. 16 201039022 The 6D is a graph showing the brightness distribution obtained in the case where the light incident surface of the light guide plate is provided with a concave surface and the radius of curvature of the curved portion of the concave surface is 0.4 mm. Fig. 6E is a graph showing the brightness distribution obtained in the case where the light incident surface of the light guide plate is provided with a concave surface and the radius of curvature of the curved portion of the concave surface is 0.8 mm. 6F is a diagram showing that the light guide plate has two inclined surfaces adjacent to the lower two sides of the light incident surface, and the angle between the inclined surface and the light incident surface is 45 degrees, and the light incident surface is provided with a concave surface, and the concave curved surface is provided. The brightness distribution curve obtained when the radius of curvature is 0.4 mm. 6G is a diagram showing that the light guide plate has two inclined surfaces adjacent to the lower side of the light incident surface, and the angle between the inclined surface and the light incident surface is 71.1 degrees, and the light incident surface is provided with a concave surface, and the concave curved surface is provided. The brightness distribution curve obtained in the case where the radius of curvature is 0.8 mm. [Main component symbol description] 100 backlight module 102 light guide plate 104 light-incident surface 106 light-emitting surface 108 light source module 110 light-emitting diode element 112 light-emitting surface 114 light 200 liquid crystal display 202 liquid crystal panel 204 backlight module 206 back plate 208 Light source module 210 reflective sheet 212a: light guide plate 212b: light guide plate 212c: light guide plate 212d: light guide plate 17
201039022 212e :導光板 216 :增亮膜 220 :發光二極體元件 224a :入光面 224c :入光面 224e :入光面 228 :凹面 230 :弧形區 214 :膠框 218 :擴散膜 222 :出光面 224b :入光面 224d ··入光面 226 :傾斜面 228a :凹面 230a :弧形區 234 :出光面 238 :圖形 242 :圖形 246 :圖形 250 :圖形 254 :圖形 258 :圖形 262 :圖形 266 :圖形 270 :圖形 274 :圖形 (9 :夾角 232 ： 光 236 ： 圖 形 240 ： 圖 形 244 ： 圖 形 248 ： 圖 形 252 ： 圖 形 256 ： 圖 形 260 ： 圖 形 "264 : 圖 形 268 ： 圖 形 272 ： 圖 形 276 ： 圖 形 18201039022 212e: light guide plate 216: brightness enhancement film 220: light emitting diode element 224a: light incident surface 224c: light incident surface 224e: light incident surface 228: concave surface 230: curved area 214: plastic frame 218: diffusion film 222: Light-emitting surface 224b: light-incident surface 224d · light-incident surface 226: inclined surface 228a: concave surface 230a: curved area 234: light-emitting surface 238: graphic 242: graphic 246: graphic 250: graphic 254: graphic 258: graphic 262: graphic 266: Graphics 270: Graphics 274: Graphics (9: Angle 232: Light 236: Graphics 240: Graphics 244: Graphics 248: Graphics 252: Graphics 256: Graphics 260: Graphics " 264: Graphics 268: Graphics 272: Graphics 276: Figure 18