1269917 九、發明說明： 【發明所屬之技術領域】 ， 本發明係關於-種背光模組及使用該背光模 、、且之液晶顯示裝置。 【先前技術】 由於液晶顯示器面板中之液晶本身不具發光 , 口而，為達到顯示效果，須給液晶顯示器面 供一面光源裝置，如背光模組，其功能在於向# 、文日日顯不器面板供應輝度充分且分佈均勻之面光 源。 驾头技術之月光模組如第一圖所示，該背光模 組1主要由光源11、導光板、反射板13、擴散 板14及二稜鏡板組成。其中，該導光板12之 作用在於引導光線傳輸方向，進而提高液晶顯示器 面板之輝度及均勻性。為提高光源11之利用效 率’通常於光源11 一側設置一燈罩111，用以將鲁 光源11所發出之光線全部反射入該導光板12。 依導光板12之形狀，其又可分為平板形導光 板及楔形導光板。另，為增加出光效率及均勻性， 通常於導光板12之一面設置V形槽或配置網點（圖 未示），且，該V形槽或網點於導光板12上配置之 距離及大小均可有不同之設計。 該背光模組1中，因其使用導光板12，則背 6 1269917 光模組1尺寸越大’導光板12之面積與厚户亦越， 大，將增加其成本及重量，該背光模組1難以達到· 低成本、重量輕之特性。另，背光模組1中，導光 板12會吸收部份入射光，使背光模組}不具有高 的光利用率。 有鑑於此’ k供一種低成本、重量輕及光利用 率高之背光模組實為必要。 【發明内容】 本發明之目的在於提供一種低成本、重量輕及籲 光利用率高之背光模組。 本發明之另一目的在於提供一種使用該背光 模組之液晶顯示裝置。 本發明背光模組包括一反射板、一擴散板、二 棱鏡板及至少一光源，其中，該反射板、該擴散板 與該二稜鏡板係順序排列，且該反射板與該擴散板 之間形成空間，該至少一光源係設置於該空間端面籲 處。該反射板相對該擴散板之表面排佈複數散射網 點0 本發明之液晶顯示裝置包括一液晶顯示面板 及為該液晶顯示面板提供照明之背光模組’其中’ 該背光模組包括一反射板、一擴散板、二稜鏡板及 至少一光源。該反射板、該擴散板與該二稜鏡板係 順序排列，且該反射板與該擴散板之間形成空間， 該至少一光源係設置於該空間端面處。該反射板相 7 1269917 對該擴散板之表面排佈複數散射網點。 . 與習知技術相比，本發明背光模組不使用導光. 板’直接將散射網點排佈於反射板表面，用以反射 與發散光束。導光板於整體背光模組之成本中約佔 17%，本發明背光模組不使用導光板，可大幅降低 成本’亦使背光模組輕量化。另，不設置導光板， 亦可避免導光板對光的吸收及光通過導光板與其 他元件父界面時帶來的光損失’從而提高光利用 率。 Φ 【實施方式】 請參照第二圖，係本發明第一實施方式背光模 組2之結構示意圖。該背光模組2包括一反射板 2 3 擴政板24、一棱鏡板25及二光源21，其中， 反射板23、擴散板24與二稜鏡板25係順序排列， 且該反射板23之表面231與該擴散板24之表面 241相對，且其間形成一定空間（未標示）。反射板_ 23之表面231排佈有複數散射網點2〇，該散射網 點20係規則排列。 請參閱第三圖，係本發明第一實施方式背光模 組2之光路示意圖。該二光源21設置於背光模組 2側方，即導光板23與擴散板24之間形成的空間 兩端。工作時’光源21發光，不同入射角度的光 線211、212進入該空間。藉由控制光源21之位置， 使光線211以較大入射角入射至擴散板24之表面 1269917 241，僅小部份光透射，大部份光發生反射回到空· 間内繼續向下傳播。光線212入射後，行進至散射， 網點20 ’其中一部份光可穿透散射網點20，然後 經由反射板23之表面231反射回到空間中，另一 部份光可於散射網點20表面直接被反射回到空間 中，故’光線212經由散射網點20散射後會完全 回到該空間内。回到空間内的光線212，部份以較 小的入射角穿透擴散板24之表面241，經擴散板 24散射出去，另一部份於擴散板24之表面發 生反射，回到空間中繼續傳播。 又 曰 你w Z41發生反射的光線2] 茅1取二均經過散射網點2G散射、然後才能穿 Γ二二再經由擴散板24散射出去。故，光 發出的大部份光均會經過 散射網點2〇係規則 狀耵 231，離光、# μ J排佈於反射板23之表 雕九源21距離越近， 網點20密度越小，反 先強越大，排佈的散 強越小，排佈的散射C:21距離越遠’ 散射幾率，該種排佈方 之雄、度越大，可增 分佈更均勻。散射網點可使入射光充分散劍 二氧化矽（Si〇2)製成。 可由二氧化鈦（Ti〇2)1269917 IX. Description of the Invention: [Technical Field] The present invention relates to a backlight module and a liquid crystal display device using the same. [Prior Art] Since the liquid crystal in the liquid crystal display panel itself does not have a light, the mouth, in order to achieve the display effect, the liquid crystal display surface must be provided with a light source device, such as a backlight module, and its function lies in the #,文日日示器The panel supplies a surface light source with sufficient brightness and uniform distribution. The moonlight module of the driving technology is as shown in the first figure. The backlight module 1 is mainly composed of a light source 11, a light guide plate, a reflection plate 13, a diffusion plate 14, and a second plate. The function of the light guide plate 12 is to guide the light transmission direction, thereby improving the brightness and uniformity of the liquid crystal display panel. In order to improve the utilization efficiency of the light source 11, a lamp cover 111 is generally disposed on the side of the light source 11 for reflecting all the light emitted by the light source 11 into the light guide plate 12. According to the shape of the light guide plate 12, it can be further divided into a flat plate type light guide plate and a wedge type light guide plate. In addition, in order to increase the light-emitting efficiency and uniformity, a V-shaped groove or a mesh point (not shown) is usually disposed on one surface of the light guide plate 12, and the distance and size of the V-shaped groove or the mesh point disposed on the light guide plate 12 can be There are different designs. In the backlight module 1, because the light guide plate 12 is used, the size of the light module 1 of the back 6 1269917 is larger. The area and thickness of the light guide plate 12 are larger and larger, which will increase the cost and weight thereof. 1 difficult to achieve · low cost, light weight characteristics. In addition, in the backlight module 1, the light guide plate 12 absorbs part of the incident light, so that the backlight module does not have high light utilization efficiency. In view of this, it is necessary to provide a backlight module with low cost, light weight and high light utilization. SUMMARY OF THE INVENTION An object of the present invention is to provide a backlight module which is low in cost, light in weight, and high in utilization efficiency. Another object of the present invention is to provide a liquid crystal display device using the backlight module. The backlight module of the present invention comprises a reflecting plate, a diffusing plate, a prism plate and at least one light source, wherein the reflecting plate, the diffusing plate and the second plate are sequentially arranged, and between the reflecting plate and the diffusing plate Forming a space, the at least one light source is disposed at an end face of the space. The liquid crystal display device of the present invention includes a liquid crystal display panel and a backlight module for providing illumination to the liquid crystal display panel. The backlight module includes a reflector. a diffusion plate, a second plate and at least one light source. The reflector, the diffuser and the second plate are sequentially arranged, and a space is formed between the reflector and the diffuser, and the at least one light source is disposed at the end face of the space. The reflector phase 7 1269917 arranges a plurality of scattering dots on the surface of the diffuser. Compared with the prior art, the backlight module of the present invention does not use light guiding. The board ' directly arranges the scattering dots on the surface of the reflecting plate for reflecting and diverging the light beam. The light guide plate accounts for about 17% of the cost of the overall backlight module. The backlight module of the present invention does not use a light guide plate, which can greatly reduce the cost and light weight of the backlight module. In addition, the light guide plate is not provided, and the light absorption by the light guide plate and the light loss caused when the light passes through the interface of the light guide plate and other elements can be avoided, thereby improving the light utilization rate. [Embodiment] Please refer to the second drawing, which is a schematic structural view of a backlight module 2 according to a first embodiment of the present invention. The backlight module 2 includes a reflecting plate 23, a diffusing plate 24, a prism plate 25, and two light sources 21, wherein the reflecting plate 23, the diffusing plate 24 and the second plate 25 are sequentially arranged, and the surface of the reflecting plate 23 is arranged. 231 is opposite to the surface 241 of the diffuser plate 24 with a certain space (not shown) therebetween. The surface 231 of the reflecting plate _ 23 is arranged with a plurality of scattering dots 2 〇, and the scattering dots 20 are regularly arranged. Please refer to the third figure, which is a schematic diagram of the optical path of the backlight module 2 of the first embodiment of the present invention. The two light sources 21 are disposed on the side of the backlight module 2, that is, at both ends of the space formed between the light guide plate 23 and the diffusion plate 24. During operation, the light source 21 emits light, and the light rays 211, 212 of different incident angles enter the space. By controlling the position of the light source 21, the light ray 211 is incident on the surface 1269917 241 of the diffusing plate 24 at a large incident angle, and only a small portion of the light is transmitted, and most of the light is reflected back into the space and continues to propagate downward. After the light 212 is incident, it travels to the scattering, and a portion of the light of the dot 20' can penetrate the scattering dot 20 and then be reflected back into the space through the surface 231 of the reflecting plate 23, and another portion of the light can be directly on the surface of the scattering dot 20 It is reflected back into the space, so that the ray 212 will scatter back through the scatter grid 20 and will completely return to the space. The light rays 212 returning to the space partially penetrate the surface 241 of the diffusion plate 24 at a small incident angle, are scattered by the diffusion plate 24, and the other portion is reflected on the surface of the diffusion plate 24, and returns to the space to continue. propagation.曰 w w w Z Z41 reflected light 2] 茅 1 take two to scatter through the scattering point 2G, and then can be worn through the diffusion plate 24 and then scattered out. Therefore, most of the light emitted by the light passes through the scattering grid point 2, and the closer the distance between the light and #μJ is arranged on the surface of the reflector 23, the closer the density of the dot 20 is. The stronger the first, the smaller the dispersion, and the more scattered the C:21 distance is. The scattering probability, the greater the male and the degree of the arrangement, the more uniform the distribution. Scattering dots allow the incident light to be made up of sputum dioxide (Si〇2). Can be made of titanium dioxide (Ti〇2)
組4 同 請參閱第四圖 之結構示意圖 其包括一排佈 ，係本發明第 。其與第一實 複數擴散網點 二實施方式背光模 細*方式結構大致相 40之反射板43、 1269917 擴政板44、二稜鏡板45及一光源41。其中，該’ 反射板43之複數散射網點4〇係規則排列，離光源_ 41距離較近處’排佈的散射網點4〇顆粒及密度較 J離光源41距離較遠處，排佈的散射網點40顆 粒及4度較大。於背光模組4之擴散板44之表面 (未標示）設置一硬質透光膜片46作為擴散板44之 底材 了由承甲基丙烯酸曱醋（PolymethylGroup 4 is the same as the structure diagram of the fourth figure. It comprises a row of cloth, which is the first aspect of the invention. The reflector plate 43 and the 1269917 expansion plate 44, the second plate 45 and a light source 41 are substantially the same as the first embodiment. Wherein, the plurality of scattering dots 4 of the 'reflecting plate 43 are regularly arranged, and the distance from the light source _ 41 is closer to the scattering point 4 〇 particles and the density is farther than the distance from the light source 41, and the scattering is arranged. The dot 40 particles and 4 degrees are larger. A hard transparent film 46 is disposed on the surface of the diffusion plate 44 of the backlight module 4 (not shown) as a substrate of the diffusion plate 44. Polymethyl methacrylate (Polymethyl)
MethacryUte，PMMA)或聚乙烯（pE，p〇iyethyiene) 等材料製成，用於支撐背光模組4之結構，避免擴參 政板44及稜鏡板45彎曲。另，可於該硬質透光膜 片46表面設置v形槽或配置網點（圖未示），可進 一步散射光線，使出射光均勻。 請參閱第五圖，係本發明第三實施方式背光模 組5之結構示意圖。其與第一實施方式結構大致相 同’其包括一排佈複數擴散網點50之反射板53、 一第一擴散板54、一第二擴散板57、二稜鏡板55、籲 二冷陰極螢光燈管51及燈罩59，其中，該反射板 53與該第一擴散板54之間形成空間（未標示），該 二冷陰極螢光燈管51設置於該空間二端，該燈罩 59用以將冷陰極螢光燈管51發出之光線反射入該 空間中。該第二擴散板5 7設置於二稜鏡板5 5相對 第一擴散板5 4之另一側，可用於保護該二稜鏡板 5 5 ’亦可柔化出射光，使光線更加均勻。 請參閱第六圖，係本發明液晶顯示裝置6 〇 〇之 1269917 結構示意圖，其包括第二圖 晶顯示面板60。其中，該不之背光模組2及液 液晶顯示面板60下方，C 2係設置於該 勻之面朵调兮访曰-之日日顯示面板60提供均 无原。該液晶顯不裝番 為背朵捃如/ ★此1 置6〇0之背光模組亦可 月九杈組4或背光模組5。 综上所述，本發明符合 提出專利申請。惟，以上所』去月專利要件，麦依法 實施例，舉凡熟習本案技藝：：僅為本發明：較佳 明之杜θ之人士，在援依本案發 月之精神所作之等效修飾 ^ ^ ^^ ^ τ及變化，皆應包含於以下 心甲4專利範圍内。 【圖式簡單說明】 =-圖係習知技術背光模組之分解示意圖。 苐二圖係本發明背光掇 構示意圖。 ^ 且第一實施方式之結 弟三圖係本發明背光掇 ^ ^ 攸-立 冗辑級第一實施方式之光 $不意圖。 塞第四圖係本發日月背光模 式之結 構示意圖。 第五圖係本發明背光模級第三實施方式之結 構示意圖。 第六圖係本發明液晶 【主要元件符號說明】 背光模組 2、4、5 散射網點 20、40、50 顯示裝置之結構示意圖。 光源、 11、41 光線 211、212 11 1269917 反射板 23 、 43 、 53 透光膜片 46 稜鏡板 25 、 45 、 55 冷陰極螢光燈管 51 光源罩 59 液晶顯示面板 60 表面 231 、 241 液晶顯示裝置 600 擴散板 24 、 44 、 54 、 57It is made of materials such as MethacryUte (PMMA) or polyethylene (pE, p〇iyethyiene) to support the structure of the backlight module 4, and avoids the expansion of the slab 44 and the slab 45. Alternatively, a v-shaped groove or a dot (not shown) may be disposed on the surface of the hard transparent film 46 to further scatter light to make the emitted light uniform. Please refer to the fifth figure, which is a schematic structural view of a backlight module 5 according to a third embodiment of the present invention. It is substantially the same as the structure of the first embodiment. It comprises a reflecting plate 53 of a plurality of diffusing dots 50, a first diffusing plate 54, a second diffusing plate 57, a second plate 55, and a cold cathode fluorescent lamp. a tube 51 and a lamp cover 59, wherein a space (not shown) is formed between the reflection plate 53 and the first diffusion plate 54, and the two cold cathode fluorescent lamps 51 are disposed at two ends of the space, and the lamp cover 59 is used for Light emitted from the cold cathode fluorescent lamp 51 is reflected into the space. The second diffusion plate 57 is disposed on the other side of the second plate 5 5 opposite to the first diffusion plate 514, and can be used to protect the second plate 5 5 ' to soften the light to make the light more uniform. Please refer to the sixth drawing, which is a schematic structural view of a liquid crystal display device 6 699 〇 1269917 of the present invention, which includes a second crystal display panel 60. Wherein, under the backlight module 2 and the liquid crystal display panel 60, the C 2 system is disposed on the day-to-day display panel 60 of the uniform face-to-face display. The LCD display is not included. For example, the backlight module of the 6〇0 can also be used for the Moonlight Group 4 or the backlight module 5. In summary, the present invention is in compliance with a patent application. However, the above-mentioned patents for going to the moon, the law of the law, and the skills of the case: only for the present invention: the better of the people of the θ, the equivalent modification in the spirit of the month of the aid of the case ^ ^ ^^ ^ τ and changes should be included in the following patents. [Simple description of the diagram] =- Diagram is a schematic diagram of the decomposition of the conventional backlight module. The second drawing is a schematic diagram of the backlight structure of the present invention. And the third embodiment of the first embodiment is the backlight of the present invention, which is not intended to be the first embodiment of the present invention. The fourth diagram of the plug is a schematic diagram of the structure of the backlight module of the present day and month. Fig. 5 is a view showing the structure of a third embodiment of the backlight mode of the present invention. Figure 6 is a liquid crystal of the present invention. [Description of main component symbols] Backlight module 2, 4, 5 Scattering dots 20, 40, 50 Structure of the display device. Light source, 11, 41 Light 211, 212 11 1269917 Reflector 23, 43 , 53 Transmissive diaphragm 46 稜鏡 25, 45, 55 Cold cathode fluorescent tube 51 Light source cover 59 Liquid crystal display panel 60 Surface 231, 241 Liquid crystal display Device 600 diffuser plates 24, 44, 54, 57
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