200827867 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種背光模 顯示裝置。 【先前技術】 組及採用該背光模組之液晶200827867 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a backlight mode display device. [Prior Art] Group and liquid crystal using the backlight module
液晶顯示裝置具有㈣、低耗電及輻射少特點，並被廣 ^於監視器、液晶電視、手機及便携式電腦等領域，並成 為顯不m但⑽對其顯轉度及色_雜果提出更 °由於液晶本身不發光’需背光模組為其提供光源。 :、个组,爷分為直下式背光模組與側光式背光模組。目 1月光_組之發光源主要採用冷陰極射線管及發光二極體 ρ歹]自於發光—極體具高色彩飽和度、不含汞、高壽命等 特性，已廣泛被應用於背光模組中。 立明參閱圖1，係一種先前技術直下式背光模組之立體示 意圖。該背光模組100包括一底板110、設置於該底板110 上之一發光二極體陣列12〇及設置於該底板η〇上方之一擴 散板140。 該發光二極體陣列120由複數紅、綠、藍光發光二極體 127、128、129組成，其排佈規律為··一排紅光發光二極體 12了、一排綠光發光二極體128及一排藍光發光二極體129 依序週期排佈。該紅、綠、藍光發光二極體127、128、129 均為頂面發光之發光二極體。 該發光二極體陣列120之紅、綠、藍光發光二極體127、 U8、129能分別發出紅、綠、藍三色光，該紅、綠、藍三色 200827867 •光在離開光源射向該擴散板140過程中不斷進行混光，傳輸 .一定距離後混合為白光射至該擴散板140。 惟，由於背光模組100之尺寸大小限制，光束混光距離 有限，白光混合難以均勻，易出現偏黃或偏藍，從而無法達 到所要求之白光。且用於顯示裝置背光時，混光不均易使顯 示面板不同區域出現色差現象。為使三色光充分混合成白 光，需增加混光距離，則會增加該背光模組100之厚度，不 符合背光模組日益輕薄化之發展趨勢。 >【發明内容】 有鑑於此，提供一種混光效果較佳且厚度較小之背光模 組實為必要。 另，提供一種採用上述背光模組之液晶顯示裝置亦為必 要。 一種背光模組，其包括至少一發光單元。該發光單元包 括複數發光源及一混光器，該發光源發出不同顏色光，該混 I光器包括複數與該發光源一一對應之導光元件及一混光元 件。該導光元件將該發光源發出之不同顏色光導入該混光元 件，不同顏色光在該混光元件中混合為白光。 一種液晶顯示裝置，其包括一液晶顯示面板及一背光模 組。該背光模組包括至少一發光單元。該發光單元包括複數 發光源及一混光器，該發光源發出不同顏色光，該混光器包 括複數與該發光源——對應之導光元件及一混光元件。該導 光元件將該發光源發出之不同顏色光導入該混光元件，不同 顏色光在該混光元件中混合為白光。 7 200827867 ， 相較於先前技術，本發明背光模組具該混光器，其導光 •元件將該複數發光源發出之不同顏色之光導入該混光元 件，該混光元件使不同顏色光混合為白光，從而得到一均勻 之面光源，因此，該背光模組之混光效果較佳。又，由於混 光過程在該混光元件内完成，使得混光不需受混光距離之限 制，進而不會增加該背光模組之厚度。另，因該背光模組混 光效果仏’攸而採用該背光板組之液晶顯不裝置可得到均勻 之面光源，進而顯示品質較佳，而該背光模組之厚度較小， 亦使該液日日顯不裝置厚度較小。 【實施方式】 請參閱圖2，係本發明背光模組第一實施方式之立體示 意圖。該背光模組200為一直下式背光模組，其包括一底板 210、設置於該底板210上之陣列排佈之複數發光單元220 及設置於該底板210上方之一擴散板240。該發光單元220 包括一紅光發光二極體227、一綠光發光二極體228、一藍 光發光二極體229及一混光器222。 請一併參閱圖3、圖4及圖5，圖3係該紅、綠、藍光 發光二極體227、228、229之排佈圖，圖4係該混光器222 之立體示意圖，圖5該發光單元220沿V方向之侧視圖。 該紅、綠、藍光發光二極體227、228、229首尾相鄰圍 成一三角區域。該混光器222包括三導光柱223及一混光鏡 226。該三導光柱223置於該底板210上之該紅、綠、藍光 發光二極體227、228、229所圍成之三角區域内。 每一導光柱223之縱截面為L形，該L形之拐角處以圓 200827867 •孤過渡，其包括一用於入光之第一端面224及一用於出光且 *與該弟一端面224垂直之弟二端面225。該紅、綠、藍光發 光二極體227、228、229均為侧面發光之發光二極體，其三 發光面分別對應該三導光柱223之三第一端面224。 該混光鏡226為碗狀結構，其開口朝上，底部與三導光 柱223之三第二端面225相連接，且與該導光柱223圍成一 空腔。 > 該混光器222之材質係透光性較佳之透明材料，其折射 率大於空氣之折射率，可為聚碳酸脂（Polycarbonate，PC)或 者聚甲基丙烯酸曱脂（Polymethyl Methacrylate，PMMA)等。 該發光單元220之光路原理如下：該紅、綠、藍光發光 二極體227、228、229發出之紅、綠、藍三色光分別從該三 導光柱223之三第一端面224進入該三導光柱223，並在該 導光柱223中發生全反射而傳播，進而從該第二端面225射 入該混光鏡226。該三色光之一部份光在該混光鏡226中混 |合成白光後射出；該三色光之另一部份光從該混光鏡226直 接射出，由於該混光鏡226為碗狀結構，亦相當於一凹透鏡， 可將射入之三色光呈發散狀射出，進而使三色光在該混光鏡 226之碗狀空間内充分混合。 相較於先前技術，由於該發光單元220具該混光器 222,該混光器222包括三導光柱223及一混光鏡226,該三 導光柱223分別將該紅、綠、藍光發光二極體227、228、229 發出之三色光導入該混光鏡226，該三色光之一部份光在該 混光鏡226中混合為白光後射出；由於該混光鏡226亦相當 200827867 *於一凹透鏡，其使該三色光之另一部份光呈發散狀射出，並 •在該混光鏡226之碗狀空間内充分混合，從而每一發光單元 220均射出均勻之白光，進而得到均勻之面光源，因此，該 背光模組200之混光效果較佳。又，由於該三色光之混光過 程在該混光器222之混光鏡226及其所定義之碗狀空間内完 成，避免出現先前技術三色光在光傳播過程中混光而使得混 光受混光距離限制之問題，不會增加該背光模組2〇〇之厚度。 另，該混光器222之導光柱223位於該底板210上該紅、 .綠、藍光發光二極體227、228、229所圍成之三角形區域内， 且該混光鏡226之開口朝上，底部與該導光柱223之第二端 面225相連接，因此不影響該紅、綠、藍光發光二極體227、 228、229之散熱’因而該背光模組200之散熱功能較好。 請一併參閱圖6及圖7，圖6係本發明背光模組第二實 施方式之發光單元之紅、綠、藍光發光二極體排佈圖，圖7 係本發明背光模組第二實施方式之一混光器之立體示意 ，圖。該背光模組與第一實施方式之背光模組200之主要區別 在於：其發光單元320包括一紅光發光二極體327、二綠光 發光二極體328、一藍光發光二極體329及一混光器，二綠 光發光二極體328相對設置，該紅光發光二極體327與該藍 光發光二極體329相對設置，上述四發光二極體327、328、 329首尾相鄰圍成一正方形區域。該混光器322對應包括四 導光柱323及一混光鏡326。該四導光柱323位於底板上該 四發光二極體327、328、329所圍成之正方形區域内。該四 發光二極體327、328、329之四發光面分別對應四導光柱323 200827867 •之四第一端面324。該碗狀混光鏡326之底部與該導光柱323 ，之四第二端面相連接，且與該四導光柱323圍成一空腔。 請一併參閱圖8及圖9，圖8係本發明背光模組第三實 施方式之侧視圖，圖10係圖9所示背光模組之發光單元之 結構示意圖。該背光模組400與第一實施方式之背光模組 200之主要區別在於：該背光模組400為一侧光式背光模 組，其進一步包括一導光板450及一反射片460。該導光板 450包括一入光面451、一與該入光面451相鄰之出光面452 >及一與該出光面452相對之底面453。該發光單元42〇成一 列排佈設置於該導光板450之入光面451 —侧。該反射片460 鄰近該導光板45Ό之底面453設置。擴散板440鄰近該導光 板450之出光面452設置。 請參閱圖10,係本發明液晶顯示裝置之示意圖。該液晶 顯示裝置2包括一液晶顯示面板20及鄰近該液晶顯示面板 20設置之一背光模組，該背光模組可採用上述任意一實施方 _式所述之背光模組。 本發明背光模組亦可具其他多種變更設計，如：第_實 施方式中，該發光單元220之紅、綠、藍光發光二極體227、 228、229亦可為其他顏色光之發光二極體，並不限於紅、綠、 該二多。 —TTOL — Γ_Α 綜上所述，本發明確已符合發明專利之要件，查依法提 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，舉凡熟習本案技蓺 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 11 200827867 •於以下申清專利範圍内。 .【圖式簡單說明】 圖1係一種先前技術直下式背光模組之立體示意圖。 圖2係本發明背光模組第一實施方式之立體示意圖。 圖3係圖2所示背光模組之紅、綠、藍光發光二極體之排佈 圖0 圖4係圖2所示背光模組之混光器之立體示意圖。 圖5係圖2所示背光模組之發光單元沿V方向之侧視圖。 圖6係本發明背光模組第二實施方式之紅、綠、藍光發光二 極體之排佈圖。 圖7係本發明背光模組第二實施方式之混光器之立體示意 圖0 圖8係本發明背光模組第三實施方式之侧視圖。 圖9係圖8所示背光模組之發光單元之結構示意圖。 圖10係本發明液晶顯示裝置之示意圖。 【主要元件符號說明】 背光模組 200 > 400 發光單元 紅光發光二極體 227 、 327 綠光發光二極體 228 、 328 第一端面 224 、 324 混光鏡 226 、 326 導光板 450 入光面 451 底板 210 220 > 320 、 420 混光器 222、322 導光柱 223、323 藍光發光二極體229、329 第二端面 225 擴散板 240、440 反射片 460 12 452 200827867 *底面 453出光面 20 ψ液晶顯不裝置 2液晶顯不面板The liquid crystal display device has the characteristics of (4), low power consumption and low radiation, and is widely used in the fields of monitors, LCD TVs, mobile phones and portable computers, and has become a significant feature, but (10) its display degree and color More ° because the liquid crystal itself does not emit light, the backlight module is required to provide a light source. :, group, the lord is divided into a direct-lit backlight module and an edge-lit backlight module. The light source of the Moonlight Group is mainly used in cold cathode ray tubes and light-emitting diodes. Since the light-emitting body has high color saturation, mercury-free, and high life, it has been widely used in backlight modules. In the group. Referring to Figure 1, a perspective view of a prior art direct type backlight module is shown. The backlight module 100 includes a bottom plate 110, an array of light-emitting diodes 12 disposed on the bottom plate 110, and a diffusion plate 140 disposed above the bottom plate η. The LED array 120 is composed of a plurality of red, green and blue light-emitting diodes 127, 128, and 129, and the arrangement is as follows: a row of red light-emitting diodes 12, and a row of green light-emitting diodes The body 128 and the row of blue light emitting diodes 129 are sequentially arranged. The red, green, and blue light emitting diodes 127, 128, and 129 are all light emitting diodes with top surface illumination. The red, green, and blue light-emitting diodes 127, U8, and 129 of the LED array 120 can respectively emit red, green, and blue light, and the red, green, and blue colors are 200827867. During the process of the diffusion plate 140, the light is continuously mixed and transmitted. After a certain distance, the white light is mixed to the diffusion plate 140. However, due to the size limitation of the backlight module 100, the light mixing distance of the light beam is limited, the white light mixing is difficult to be uniform, and yellowing or bluishness is liable to occur, so that the required white light cannot be achieved. When used for the backlight of the display device, uneven light mixing may cause chromatic aberration in different areas of the display panel. In order to fully mix the three colors of light into white light, it is necessary to increase the light mixing distance, which increases the thickness of the backlight module 100, and does not conform to the trend of increasingly thinner and lighter backlight modules. <SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a backlight module having a better light mixing effect and a small thickness. Further, it is also necessary to provide a liquid crystal display device using the above backlight module. A backlight module includes at least one light emitting unit. The light-emitting unit comprises a plurality of light-emitting sources and a light-mixing device, the light-emitting source emitting light of different colors, and the light-mixing device comprises a plurality of light guiding elements and a light-mixing element corresponding to the light-emitting source. The light guiding element introduces different color light emitted from the light source into the light mixing element, and the different color lights are mixed into white light in the light mixing element. A liquid crystal display device includes a liquid crystal display panel and a backlight module. The backlight module includes at least one light emitting unit. The light emitting unit comprises a plurality of light sources and a light mixer, the light source emitting different colors of light, and the light mixer comprises a plurality of light guiding elements and a light mixing element corresponding to the light source. The light guiding element introduces different color light emitted from the light source into the light mixing element, and the different color lights are mixed into white light in the light mixing element. 7 200827867 , compared with the prior art, the backlight module of the present invention has the light mixer, and the light guiding component transmits the light of different colors emitted by the plurality of light sources to the light mixing component, and the light mixing component enables different color lights. The light is mixed into white light to obtain a uniform surface light source. Therefore, the backlight module has a better light mixing effect. Moreover, since the light mixing process is completed in the light mixing element, the light mixing does not need to be limited by the light mixing distance, and thus the thickness of the backlight module is not increased. In addition, because the backlight module has a light mixing effect, the liquid crystal display device of the backlight panel can obtain a uniform surface light source, and the display quality is better, and the thickness of the backlight module is smaller, The liquid does not show a small thickness on the day. [Embodiment] Please refer to Fig. 2, which is a perspective view of a first embodiment of a backlight module of the present invention. The backlight module 200 is a direct-type backlight module, and includes a bottom plate 210, a plurality of light-emitting units 220 arranged in an array disposed on the bottom plate 210, and a diffusion plate 240 disposed above the bottom plate 210. The light emitting unit 220 includes a red light emitting diode 227, a green light emitting diode 228, a blue light emitting diode 229, and a light mixer 222. Please refer to FIG. 3, FIG. 4 and FIG. 5 together. FIG. 3 is a layout diagram of the red, green and blue light emitting diodes 227, 228 and 229, and FIG. 4 is a perspective view of the light mixing device 222. The light emitting unit 220 is a side view in the V direction. The red, green and blue light-emitting diodes 227, 228, 229 are adjacent to each other to form a triangular region. The light mixer 222 includes a three light guide 223 and a light mixing mirror 226. The three light guiding columns 223 are placed in a triangular area surrounded by the red, green and blue light emitting diodes 227, 228, 229 on the bottom plate 210. Each of the light guiding columns 223 has an L-shaped longitudinal section, and the L-shaped corner is rounded at a height of 200827867. • A solitary transition includes a first end surface 224 for light entering and one for light output and * is perpendicular to the one end surface 224 The second side of the brother is 225. The red, green and blue light-emitting diodes 227, 228, and 229 are all side-emitting light-emitting diodes, and the three light-emitting surfaces respectively correspond to the first end surface 224 of the three light guide columns 223. The light mixing mirror 226 has a bowl-like structure with an opening facing upward and a bottom portion connected to the third end surface 225 of the three light guiding columns 223 and surrounding the light guiding column 223. > The material of the light mixer 222 is a transparent material with better light transmittance, and its refractive index is greater than the refractive index of air, and may be polycarbonate (Polycarbonate, PC) or polymethyl Methacrylate (PMMA). Wait. The optical path of the light-emitting unit 220 is as follows: the red, green, and blue lights of the red, green, and blue light-emitting diodes 227, 228, and 229 respectively enter the three-conductor from the first end surface 224 of the three light guides 223 The light column 223 is totally reflected by the light guide column 223 and propagates, and further enters the light mixing mirror 226 from the second end surface 225. A part of the light of the three color light is mixed in the light mixing mirror 226, and the white light is emitted, and another part of the light of the three color light is directly emitted from the light mixing mirror 226, because the light mixing mirror 226 is a bowl-like structure. The lens is also equivalent to a concave lens, and the incident three-color light is emitted in a divergent manner, so that the three-color light is sufficiently mixed in the bowl-shaped space of the light mixing mirror 226. Compared with the prior art, since the light emitting unit 220 has the light mixer 222, the light mixer 222 includes a three light guiding column 223 and a light mixing mirror 226, and the three light guiding columns 223 respectively emit the red, green and blue light. The three colors of light emitted by the polar bodies 227, 228, and 229 are introduced into the light mixing mirror 226, and a part of the light of the three color lights is mixed into white light and then emitted; since the light mixing mirror 226 is also equivalent to 200827867 * a concave lens which emits light of another part of the three-color light in a divergent manner and is sufficiently mixed in the bowl-shaped space of the light mixing mirror 226, so that each of the light-emitting units 220 emits uniform white light, thereby obtaining uniformity The light source of the backlight module 200 is better. Moreover, since the light mixing process of the three colors of light is completed in the light mixing mirror 226 of the light mixer 222 and the defined bowl-shaped space thereof, the prior art three-color light is prevented from being mixed in the light propagation process, so that the light mixing is affected. The problem of the light mixing distance limitation does not increase the thickness of the backlight module 2〇〇. In addition, the light guiding column 223 of the light mixing device 222 is located in a triangular region surrounded by the red, green, and blue light emitting diodes 227, 228, and 229 on the bottom plate 210, and the opening of the light mixing mirror 226 is upward. The bottom portion is connected to the second end surface 225 of the light guiding column 223, so that the heat dissipation of the red, green and blue light emitting diodes 227, 228, 229 is not affected. Therefore, the heat dissipation function of the backlight module 200 is better. Referring to FIG. 6 and FIG. 7 , FIG. 6 is a red, green and blue light emitting diode arrangement diagram of a light emitting unit according to a second embodiment of the backlight module of the present invention, and FIG. 7 is a second embodiment of the backlight module of the present invention. Stereoscopic illustration of one of the ways of the light mixer. The main difference between the backlight module and the backlight module 200 of the first embodiment is that the light emitting unit 320 includes a red light emitting diode 327, two green light emitting diodes 328, and a blue light emitting diode 329. a light mixing device, two green light emitting diodes 328 are oppositely disposed, the red light emitting diode 327 is disposed opposite to the blue light emitting diode 329, and the four light emitting diodes 327, 328, and 329 are adjacent to each other. Into a square area. The light mixer 322 correspondingly includes a four light guide 323 and a light mixing mirror 326. The four light guiding columns 323 are located in a square area surrounded by the four light emitting diodes 327, 328, and 329 on the bottom plate. The four light emitting surfaces of the four light emitting diodes 327, 328, and 329 respectively correspond to the four light guiding columns 323 200827867 • the fourth first end surface 324. The bottom of the bowl-shaped mixing mirror 326 is connected to the second end surface of the light guiding column 323, and is surrounded by the four light guiding columns 323. Referring to FIG. 8 and FIG. 9, FIG. 8 is a side view of a third embodiment of the backlight module of the present invention, and FIG. 10 is a schematic structural view of the light-emitting unit of the backlight module shown in FIG. The main difference between the backlight module 400 and the backlight module 200 of the first embodiment is that the backlight module 400 is a one-side optical backlight module, and further includes a light guide plate 450 and a reflective sheet 460. The light guide plate 450 includes a light incident surface 451, a light exit surface 452 > adjacent to the light incident surface 451, and a bottom surface 453 opposite to the light exit surface 452. The light-emitting units 42 are arranged in a row and disposed on the light-incident surface 451 of the light guide plate 450. The reflection sheet 460 is disposed adjacent to the bottom surface 453 of the light guide plate 45. The diffuser plate 440 is disposed adjacent to the light exit surface 452 of the light guide plate 450. Please refer to FIG. 10, which is a schematic diagram of a liquid crystal display device of the present invention. The liquid crystal display device 2 includes a liquid crystal display panel 20 and a backlight module disposed adjacent to the liquid crystal display panel 20, and the backlight module can adopt the backlight module described in any one of the above embodiments. The backlight module of the present invention can also be modified in various other ways. For example, in the embodiment, the red, green, and blue light-emitting diodes 227, 228, and 229 of the light-emitting unit 220 can also be light-emitting diodes of other color lights. Body, not limited to red, green, the two more. —TTOL — Γ_Α In summary, the present invention has indeed met the requirements of the invention patent, and the patent application has been 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 variations in accordance with the spirit of the present invention. All should cover 11 200827867 • Within the scope of the following patents. [Simplified Schematic Description] Fig. 1 is a perspective view of a prior art direct type backlight module. 2 is a perspective view of a first embodiment of a backlight module of the present invention. 3 is a perspective view of the red, green, and blue light emitting diodes of the backlight module shown in FIG. 2. FIG. 4 is a perspective view of the light mixing device of the backlight module shown in FIG. FIG. 5 is a side view of the light emitting unit of the backlight module shown in FIG. 2 in the V direction. 6 is a layout diagram of red, green, and blue light emitting diodes according to a second embodiment of the backlight module of the present invention. 7 is a perspective view of a second embodiment of a backlight module of the present invention. FIG. 8 is a side view of a third embodiment of a backlight module of the present invention. FIG. 9 is a schematic structural view of a light emitting unit of the backlight module shown in FIG. 8. Figure 10 is a schematic view of a liquid crystal display device of the present invention. [Description of main component symbols] Backlight module 200 > 400 illumination unit red light emitting diode 227, 327 green light emitting diode 228, 328 first end surface 224, 324 light mixing mirror 226, 326 light guide plate 450 light Surface 451 bottom plate 210 220 > 320 , 420 light mixer 222 , 322 light guide column 223 , 323 blue light emitting diode 229 , 329 second end surface 225 diffuser plate 240 , 440 reflective sheet 460 12 452 200827867 * bottom surface 453 light emitting surface 20 ψLCD display device 2 LCD display panel
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