H44040 100年01月06日修正替换f 六、發明說明： 【發明所屬之技術領域】 _ [0001]本發明涉及一種用於液晶顯示器（Liquid CrystalH44040 Modified on January 06, 100, replaces f. VI. Description of the Invention: [Technical Field of the Invention] _ [0001] The present invention relates to a liquid crystal display (Liquid Crystal)
Display，LCD)的發光單元及採用該發光單元的背光模 組。 【先前技術】 [0002]由於液晶顯示器具有輕、薄、耗電小等優點，其廣泛應 用於筆記本電腦、監視器、平面電視等現代化資訊設備 。又因液晶本身不具有發光特，性，枚.虞為其提供背光模 組以實現顯示功能;,Λ $ ';: [0003] 背光模組一_分為側光式 背光模組通常適用於中小 ΜηΜΒΚ9·ΗΒβ·Ι 。側光式 於大尺寸A light emitting unit of Display, LCD) and a backlight module using the light emitting unit. [Prior Art] [0002] Since liquid crystal displays have advantages such as lightness, thinness, and low power consumption, they are widely used in modern information devices such as notebook computers, monitors, and flat-panel televisions. Because the liquid crystal itself does not have the special characteristics of light, the 虞.虞 provides a backlight module to realize the display function; Λ $ ';: [0003] The backlight module is divided into a side-lit backlight module, which is generally suitable for Small and medium-sized ΜηΜΒΚ9·ΗΒβ·Ι. Sidelight type for large size
液晶顯示器則多採用直下式背光模組，:¾¾足大尺寸 晶顯示器對高輝度、高均勻度的需求。f [0004] —種先前技術直下式背光棒網丨务所声，該背光模 組ίο包括複數發光二極體單；散板104、下擴散 片106、稜鏡片108及上擴散jmo »該擴散板104包括相 對之入光面1041與出光面1 042，該發光二極體單元102 設置於該擴散板104之入光面1041—側，該下擴散片1〇6 、稜鏡片108及上擴散片110依次層疊設置在該擴散板 104的出光面1 042上。 [0005] —併參照第二圓所示，各發光二極體單元1〇2包括紅色發 光二極體1021、綠色發光二極體1 022與藍色發光二極體 1 023 ’該三種色彩之發光二極體1021、1 022與1 023發 出之光線混色成白光從擴散板104的出光面1042射出。 094121204 表單編號 A0101 第 4 頁/共 19 頁 10030044%-0 1344040 100年01月06日按正替换頁 [0006] 惟，該種背光模組10存在一些缺點。因發光二極體單元 102中各發光二極體的發光角度有一定限制，當發光二極 體單元102之間的距離B較大時，容易使擴散板104的A處 無光線照到，導致A處輝度較低，而在發光二極體單元 102正上方的擴散板104的輝度較高，整個背光模組10輝 度的均勻性不佳。常用的減小輝度較低的A處的面積的方 法有二種，一種方法是增加發光二極體單元102的數量， 從而縮短發光二極體單元102的距離B，另一種方法是增 加發光二極體單元102與擴散板104的入光面1041的距離 ，使發光二極體單元102發出的到達擴散板104出光面 1 042的光源面積範圍擴大。增加發光二極體單元102數量 的方法容易導致背光模組1 0的成本升高，且密集排列的 發光二極體單元102會產生散熱不良的問題。增加發光二 極體單元102與擴散板104的入光面1041的距離的方法則 會使整個背光模組10的厚度增加，不利於液晶顯示產品 薄型化的需求。 【發明内容】 [0007] 以下，將以實施例說明一種可提供較佳輝度均勾性並可 降低背光模組厚度的發光單元，以及，一種採用該發光 單元的背光模組Λ [0008] 為實現上述實施例之内容提供一種發光單元，該發光單 元包括紅色發光二極體、綠色發光二極體、藍色發光二 極體、合色稜鏡、第一反射裝置與第二反射裝置。該合 色棱鏡包括順次連接的第一側面、第二側面、第三側面 與第四側面。該第二反射裝置位於該合色稜鏡的第一側 094121204 表單編號Α0101 第5頁/共19頁 1003004496-0 »44040 100年01月06日梭正替換頁 面一側，該綠色發光二極體對應該第二反射裝置，且其 發出的綠色光線經該第二反射裝置反射後由該第一側面 進入該合色稜鏡，該紅色發光二極體與藍色發光二極體 分別位於該合色稜鏡相對的第二側面與第四側面兩側， 其發出的紅色與藍色光線分別由該第二側面與第四側面 進入該合色稜鏡。該紅色發光二極體、綠色發光二極體 與藍色發光二極體發出的光線經該合色稜鏡後混色成白 色光後從第三側面射出，該白色光投射至第一反射裝置 後被反射。 [0009] 以及，提供一種背_#：#&_讀鱗擴散板與複 光面，該 發光單元 數發光單元，録擴散板包 複數發光單元設置在該擴 包括紅色發光二極體、綠色發光二極擊色發光二極 體、合色稜鏡、第一反射裝置與第二 裝置 該合色 側面與 一側面 該綠色發光二極體對應4亥第二反射裝置，且其發 棱鏡包括順次連接的第一娜面、第二側面『第三:n[. | w寸"πί 第四側面。該第二反射裝皇，体於談合色'’竣鏡的第 一側 出的綠色光線經該第二反射裝置反射後由該第一侧面進 入該合色棱鏡，該紅色發光二極體與藍色發光二極體分 別位於該合色稜鏡相對的第二側面與第四側面兩側，其 發出的紅色與藍色光線分別由該第二侧面與第四側面進 入該合色稜鏡。該紅色發光二極體、綠色發光二極體與 藍色發光二極體發出的光線經該合色稜鏡後混色成白色 光後從第三側面射出，該白色光投射至第一反射裝置並 被反射至該擴散板入光面並從該擴散板出光面射出。 094121204 表單編號Α0101 第6頁/共19頁 1003004496-0 13440.40 __ 100年01月06日梭正替换頁 [0010] 以及，提供一種發光單元，包括紅色發光二極體、綠色 發光二極體、藍色發光二極體、合色稜鏡與第一反射裝 置。該紅色發光二極體、綠色發光二極體與藍色發光二 極體發出的紅色、綠色與藍色光線分別經該合色稜鏡的 三個側面進入，並經該合色棱鏡混色成白色光後從該合 色棱鏡射出，該白色光投射至第一反射裝置並被反射。 [0011] 以及，提供一種背光模組，包括擴散板與複數發光單元 ，該擴散板包括相對之入光面及出光面，該複數發光單 元設置在該擴散板入光面一側。各發光單元包括紅色發 光二極體、綠色發光二極體、藍色發光二極體、合色稜 鏡與第一反射裝置。該紅色發光二極體、綠色發光二極 體與藍色發光二極體發出的紅色、綠色與藍色光線分別 經該合色棱鏡的三個側面進入，並經該合色稜鏡混色成 白色光後從該合色稜鏡射出，該白色光投射至第一反射 裝置並被反射至該擴散板入光面並從該擴散板出光面射 出。 [0012] 上述實施例所提供的發光單元利用合色稜鏡及反射裝置 增加發光二極體發出的光線在進入擴散板前的行進路程 ，從而擴大到達擴散板出光面的光源面積，提供給背光 模組較佳的輝度均勻性，同時，還可減小背光模組的整 體厚度。 [0013] 上述實施例的背光模組因採用所提供的發光單元，其輝 度均勻性較佳，且整體厚度較小，另外，因各發光單元 内的發光二極體係分開排列，其散熱效果較佳。 【實施方式】 094121204 表單編號 A0101 第 7 頁/共 19 頁 1003004496-0 I» H44040 100年01月06日梭正替換頁 [0014] 如第三圖及第四圖所示，分別係本發明背光模組的立體 示意圖及平面示意圖。該背光模組3 00包括複數發光單元 30及擴散板40。該擴散板40包括相對之入光面4i與出光 面42。該複數發光單元30規則設置於該擴散板40之入光 面41 一側。 [0015] 該發光單元30包括紅色發光二極體31、綠色發光二極體 32、藍色發光二極體33、合色棱鏡34、兩個直角三棱鏡 35與36。該合色棱鏡34係由四個鍍製有特定光學薄膜的 直角稜鏡膠合而成，其整髏成正方體結構，且該四個直 角棱鏡的斜面作為嫁潑卷礅丨ir海連接的側面（ 未標示）。談查角三稜鏡3 在該合色稜 鏡3 4的-侧，且該直角三垂直於該擴 散板40的入光面41。該直角三稜鏡36ϋ直角面連結 在該合色稜鏡34的與該直角三稜鏡的一側，且該 直角三稜鏡36的反射面361;與該褲散板4〇咍入光面41成 t A » < ΐ 7 * Λ. 1 J1- - Λ * · 子 / \ 1 45度設置。該綠色發光二和三稜鏡35的 ,* - ... .·.·>. · ··· 另一直角面設置，該紅色發光二極體31與藍色發光二極 I ·, - " * ’ 體33分別設置在該合色稜鏡34的未膠合有直角三稜鏡的 兩侧。 [0016] 以下結合第四圖及第五圖對該發光單元30的光路以及混 色過程進行說明，為方便說明，圖中的三個發光二極體 31、32與33僅以分別發出一條光線表示，其實際光線則 應呈圓錐狀發射。因反射面351與361具反射功能，當綠 色發光二極體32發出的光線321進入直角三棱鏡35並投射 在反射面351上時，該光線321被垂直反射進入該合色棱 094121204 表單編號Α0101 第8頁/共19頁 1003004496-0 1344040 100年01月06日梭正替換頁 鏡34，然後該光線321直接射出該合色稜鏡34並投射在該 直角三棱鏡36的反射面361上。當紅色發光二極體31發出 的光線311進入該合色稜鏡34時，其在該合色稜鏡34内被 垂直反射出，並投射在該直角三棱鏡36的反射面361上。 當藍色發光二極體33發出的光線331進入該合色稜鏡34時 ，其在該合色棱鏡34内被垂直反射出，並投射在該直角 三稜鏡36的反射面361上。由於該三種色彩的光線311、 321及331經過合色棱鏡34後均朝同一方向出射，該三種 色彩的光線311、321及331被混色成白色光37,該白色 光37投射在反射面361上後被垂直反射，並投射在該擴散 板40的入光面41上。 [0017] 由於該三個發光二極體31、32與33實際發出的光線係呈 圓錐狀，其在進入擴散板40前均有被反射的過程，亦即 ，該三個發光二極體31、32與33發出的光線的行進路程 均得到增長，從而擴大最終到達擴散板40入光面41的光 線面積，該光線進入擴散板40後進一步被擴散，從而提 供給背光模組300較佳的輝度均勻性，同時，還可減小背 光模組300的整體厚度。 [0018] 該背光模組300因採用複數上述的發光單元30，其輝度均 勻性較佳，且整體厚度較小，另外，因各發光單元30内 的發光二極體31、32與33係分開排列，其散熱效果較佳 〇 [0019] 本發明背光模組還可以有其他實施例，例如： [0020] 將該發光單元30的各個元件進一步固定安裝在一基板上 094121204 表單編號A0101 第9頁/共19頁 1003004496-0 B44040 [0021] [0022] [0023] [0024] [0025] [0026] [0027] [0028] [0029] [0030] [0031] [0032] [0033]Liquid crystal displays mostly use direct-lit backlight modules: 3⁄43⁄4 large-size crystal displays for high brightness and high uniformity. f [0004] A prior art direct-lit backlight bar network, the backlight module ίο includes a plurality of light-emitting diodes; the bulk plate 104, the lower diffusion plate 106, the cymbal 108, and the upper diffusion jmo » the diffusion The plate 104 includes a light-incident surface 1041 and a light-emitting surface 1042. The light-emitting diode unit 102 is disposed on the light-incident surface 1041 of the diffuser 104, and the lower diffusion sheet 1〇6, the wafer 108 and the upper diffusion plate The sheets 110 are sequentially stacked on the light emitting surface 104 2 of the diffusion plate 104. [0005] - and as shown in the second circle, each of the light emitting diode units 1 〇 2 includes a red light emitting diode 1021, a green light emitting diode 1 022 and a blue light emitting diode 1 023 'the three colors The light emitted from the light-emitting diodes 1021, 1 022 and 1 023 is mixed with white light to be emitted from the light-emitting surface 1042 of the diffuser 104. 094121204 Form No. A0101 Page 4 of 19 10030044%-0 1344040 January 6, 2010 Pressing the Replacement Page [0006] However, this type of backlight module 10 has some disadvantages. Since the illumination angle of each of the light-emitting diodes in the light-emitting diode unit 102 is limited, when the distance B between the light-emitting diode units 102 is large, it is easy to cause no light at the A of the diffusion plate 104, resulting in The luminance at the portion A is low, and the luminance of the diffusion plate 104 directly above the light-emitting diode unit 102 is high, and the uniformity of the luminance of the entire backlight module 10 is not good. There are two methods for reducing the area at the lower luminance A, one method is to increase the number of the light-emitting diode units 102, thereby shortening the distance B of the light-emitting diode unit 102, and the other method is to increase the light-emitting two. The distance between the polar body unit 102 and the light incident surface 1041 of the diffusing plate 104 increases the area of the light source that reaches the light emitting surface 1042 of the diffusing plate 104 from the light emitting diode unit 102. The method of increasing the number of the light-emitting diode units 102 tends to cause an increase in the cost of the backlight module 10, and the densely arranged light-emitting diode unit 102 causes a problem of poor heat dissipation. The method of increasing the distance between the light-emitting diode unit 102 and the light-incident surface 1041 of the diffusing plate 104 increases the thickness of the entire backlight module 10, which is disadvantageous for the thinning of the liquid crystal display product. SUMMARY OF THE INVENTION [0007] Hereinafter, a light-emitting unit that can provide better luminance uniformity and reduce the thickness of a backlight module will be described by way of example, and a backlight module using the light-emitting unit is [0008] The content of the above embodiment is provided to provide a light emitting unit, which comprises a red light emitting diode, a green light emitting diode, a blue light emitting diode, a color combining germanium, a first reflecting device and a second reflecting device. The color combining prism includes a first side, a second side, a third side, and a fourth side that are sequentially connected. The second reflecting device is located at the first side of the color 稜鏡 094121204 Form No. 1010101 Page 5 / Total 19 Page 1003004496-0 »44040 On January 06, 100, the shuttle is replacing the page side, the green LED Corresponding to the second reflecting device, and the green light emitted by the second reflecting device is reflected by the second reflecting device, and then enters the color 稜鏡 by the first side, and the red light emitting diode and the blue light emitting diode are respectively located at the The opposite sides of the second side and the fourth side of the color enamel, the red and blue light rays emitted from the second side and the fourth side respectively enter the color 稜鏡. The light emitted by the red light emitting diode, the green light emitting diode, and the blue light emitting diode is mixed into a white light by the color combination, and then emitted from the third side, and the white light is projected onto the first reflecting device. Reflected. [0009] Also, a back_#:#&_reading scale diffusing plate and a light-receiving surface are provided, the light-emitting unit number light-emitting unit, the recording diffusing plate-packing plurality of light-emitting units are disposed in the expansion including the red light-emitting diode, and the green a light-emitting diode-polarizing light-emitting diode, a color-matching light-emitting device, a first reflecting device and a second device, wherein the color-emitting side surface and the one side of the green light-emitting diode correspond to a fourth reflecting device, and the emitting prism comprises a sequential The first side of the connection, the second side "third: n[. | w inch " πί fourth side. The second reflective embossing body, the green light emitted from the first side of the chrome mirror is reflected by the second reflecting device, and then enters the color combining prism from the first side, the red light emitting diode and the blue light The color light-emitting diodes are respectively located on opposite sides of the second side and the fourth side of the color-matching cymbal, and the red and blue light rays emitted from the second side and the fourth side respectively enter the color 稜鏡. The light emitted by the red light emitting diode, the green light emitting diode and the blue light emitting diode is mixed into a white light by the color combination, and then emitted from the third side, and the white light is projected onto the first reflecting device. It is reflected to the light incident surface of the diffusing plate and is emitted from the light emitting surface of the diffusing plate. 094121204 Form No. 1010101 Page 6 of 19 1003004496-0 13440.40 __ January 06, 100th Shuttle Replacement Page [0010] And, provide a light-emitting unit including red light-emitting diode, green light-emitting diode, blue Color LED, color 稜鏡 and first reflecting device. The red, green and blue light rays emitted by the red light emitting diode, the green light emitting diode and the blue light emitting diode respectively enter through the three sides of the color combination, and are mixed into white through the color combining prism. Light is then emitted from the color combining prism, which is projected onto the first reflecting means and reflected. [0011] A backlight module includes a diffusing plate and a plurality of light emitting units. The diffusing plate includes a light incident surface and a light emitting surface. The plurality of light emitting units are disposed on a side of the light incident surface of the diffusing plate. Each of the light emitting units includes a red light emitting diode, a green light emitting diode, a blue light emitting diode, a color combining prism, and a first reflecting means. The red, green and blue light rays emitted by the red light emitting diode, the green light emitting diode and the blue light emitting diode respectively enter through three sides of the color combining prism, and are mixed into white through the color combination The light is emitted from the color conjugate, and the white light is projected onto the first reflecting means and reflected to the light incident surface of the diffusing plate and emitted from the light emitting surface of the diffusing plate. [0012] The light-emitting unit provided by the above embodiment uses the color mixing device and the reflecting device to increase the traveling distance of the light emitted by the light-emitting diode before entering the diffusing plate, thereby expanding the area of the light source reaching the light-emitting surface of the diffusing plate, and providing the light source to the backlight module. The group has better brightness uniformity and at the same time reduces the overall thickness of the backlight module. [0013] The backlight module of the above embodiment has better brightness uniformity and smaller overall thickness because of the provided light-emitting unit, and the heat-dissipating effect is better because the light-emitting diode systems in each light-emitting unit are separately arranged. good. [Embodiment] 094121204 Form No. A0101 Page 7 of 19 1003004496-0 I» H44040 January 06, 100 Shuttle Replacement Page [0014] As shown in the third and fourth figures, respectively, the backlight of the present invention A schematic view and a plan view of the module. The backlight module 300 includes a plurality of light emitting units 30 and a diffusion plate 40. The diffuser plate 40 includes a light incident surface 4i and a light exit surface 42. The plurality of light-emitting units 30 are regularly disposed on the light incident surface 41 side of the diffusing plate 40. [0015] The light emitting unit 30 includes a red light emitting diode 31, a green light emitting diode 32, a blue light emitting diode 33, a color combining prism 34, and two right angle triangular prisms 35 and 36. The color combining prism 34 is made of four right-angled cymbals plated with a specific optical film, and is formed into a rectangular parallelepiped structure, and the inclined faces of the four right-angle prisms serve as the side faces of the married 礅丨ir sea connection ( Not marked). The viewing angle 3 is on the side of the color combining prism 34, and the right angle 3 is perpendicular to the light incident surface 41 of the diffusion plate 40. The right-angled three-inch 36-inch right-angled surface is coupled to the side of the color-matching cymbal 34 opposite to the right-angled ridge, and the reflecting surface 361 of the right-angled cymbal 36; and the trousers 4 are slid into the glossy surface 41% t A » < ΐ 7 * Λ. 1 J1- - Λ * · Sub / \ 1 45 degree setting. The green light-emitting two and three-inch 35, * - ......·>. · ··· Another straight face setting, the red light-emitting diode 31 and the blue light-emitting diode I ·, - " * ' The bodies 33 are respectively disposed on both sides of the color combination 未 34 which are not glued to the right angles. [0016] Hereinafter, the optical path and the color mixing process of the light emitting unit 30 will be described with reference to the fourth and fifth figures. For convenience of explanation, the three light emitting diodes 31, 32 and 33 in the figure respectively represent only one light. The actual light should be emitted in a cone shape. Since the reflecting surfaces 351 and 361 have a reflecting function, when the light 321 emitted from the green light emitting diode 32 enters the right angle triangular prism 35 and is projected on the reflecting surface 351, the light 321 is vertically reflected into the color combining edge 094121204. Form No. Α0101 8 pages/total 19 pages 1003004496-0 1344040 On January 06, 100, the shuttle is replacing the page mirror 34, and then the light 321 is directly emitted from the color combination 稜鏡 34 and projected on the reflecting surface 361 of the right angle triangular prism 36. When the light ray 311 emitted from the red light-emitting diode 31 enters the color combiner 34, it is vertically reflected in the color combiner 34 and projected onto the reflecting surface 361 of the right-angled prism 36. When the light ray 331 emitted from the blue light-emitting diode 33 enters the color combiner 34, it is vertically reflected in the color combining prism 34 and projected on the reflecting surface 361 of the right-angled triplet 36. Since the light rays 311, 321 and 331 of the three colors are emitted in the same direction after passing through the color combining prism 34, the light rays 311, 321 and 331 of the three colors are mixed into white light 37, and the white light 37 is projected on the reflecting surface 361. It is then vertically reflected and projected onto the light incident surface 41 of the diffuser plate 40. [0017] Since the light rays actually emitted by the three light-emitting diodes 31, 32, and 33 are conical, they are reflected before entering the diffusion plate 40, that is, the three light-emitting diodes 31. The traveling distances of the light rays emitted by the 32 and 33 are increased, thereby expanding the area of the light that finally reaches the light incident surface 41 of the diffusing plate 40, and the light is further diffused after entering the diffusing plate 40, thereby providing the backlight module 300 with better. The brightness uniformity, at the same time, can also reduce the overall thickness of the backlight module 300. [0018] The backlight module 300 has a uniform brightness uniformity and a small overall thickness because a plurality of the above-described light-emitting units 30 are used, and the light-emitting diodes 31, 32, and 33 in each of the light-emitting units 30 are separated. Arranging, the heat dissipation effect is better. [0019] The backlight module of the present invention may further have other embodiments, for example: [0020] The components of the light emitting unit 30 are further fixedly mounted on a substrate 094121204 Form No. A0101 Page 9 [0030] [0023] [0023] [0023] [0033] [0033] [0033] [0033] [0033]
100年01月06日修正替换頁 亦可採用反射鏡替代上述的直角三稜鏡35、36。 綜上所述，本發明符合發明專利要件，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，舉凡 熟悉本發明技藝之人士，在援依本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】 第一圖係一種先前技術背光模組的平面示意圖。 :V 興 V、' 第二圖係第一圖所二舞體單元内部 的紅綠 第三圖 第四圖係第三圖所示的背光模組的光路龙意圖。 第五圖係第三圖所示的背光模組的另一視角的光路示意 S . ； 圖。Correction replacement page on January 06, 100. A mirror can also be used instead of the above-mentioned right-angled three-inch 35, 36. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. It is to be understood that the above-mentioned preferred embodiments of the present invention are intended to be included within the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a schematic plan view of a prior art backlight module. :V Xing V, 'The second picture is the red and green inside the dance unit of the first picture. The fourth picture is the light path of the backlight module shown in the third figure. The fifth figure is an optical path of another perspective view of the backlight module shown in the third figure.
I 【主要元件符號說明】 \,二.. 、i i ： 背光模組：300 、 發光單元：30 紅色發光二極體：31 綠色發光二極體：32 藍色發光二極體：33 擴散板：40 094121204 表單編號A0101 第10頁/共19頁 1003004496-0 1344040 100年01月06日核正替換頁 [0034] 入光面：41 [0035] 出光面：4 2 [0036] 合色棱鏡：34 [0037] 直角三稜鏡：35、36 [0038] 反射面：351、361 [0039] 紅色光：311 [0040] 綠色光：3 21 [0041] 藍色光：331 [0042] 白色光：3 7 1003004496-0 094121204 表單編號A0101 第11頁/共19頁I [Description of main component symbols] \, II.., ii: Backlight module: 300, Light-emitting unit: 30 Red light-emitting diode: 31 Green light-emitting diode: 32 Blue light-emitting diode: 33 Diffuser: 40 094121204 Form No. A0101 Page 10 / Total 19 Page 1003004496-0 1344040 January 06, 2006 Nuclear Replacement Page [0034] Light Entry Surface: 41 [0035] Light Exit Surface: 4 2 [0036] Color Combination Prism: 34 [0037] Right angle three turns: 35, 36 [0038] Reflecting surface: 351, 361 [0039] Red light: 311 [0040] Green light: 3 21 [0041] Blue light: 331 [0042] White light: 3 7 1003004496-0 094121204 Form No. A0101 Page 11 of 19