M255419 捌、新型說明 【新型所屬之技術領域】 本創作係關於一種液晶顯示裝置之背光模組，且更具 體地，係關於一種具改良擴散板之液晶顯示裝置背光模組。 【先前技術】 般液晶顯示l置所品之光線’係藉由一背光模組所 提供。請參閱圖1，習知之背光模組10係包含反射腔i 2， 光源14，與擴散板16，主要係利用光源14以提供光線並 經由反射腔12加以反射，再通過擴散板16使光線加以均 勻化。擴散板16乃將光線作散射處理以霧化光線而達到均 勻化光線之效果。 然而，因整片擴散板16之厚度均相同，故於光線亮度 車乂低之背光模組邊緣與角落部分，當光線通過擴散板i 6 後，於液晶顯示裝置邊緣與角落部分，將造成一暗帶，使 得液晶顯示裝置之晝面產生亮度不均情形。 故需要一種改進之液晶顯示裝置背光模組，可提供較 句勾之光里’且可改善液晶顯示裝置邊緣與角落部分之暗 T問題。 【新型内容】 因此本創作之一目的係提供一種液晶顯示裝置之背光 換組’背光模組之擴散板厚度係隨光源亮度而變化，而得 以提供更均勻之光線至液晶面板。 M255419 根據本創作一較佳具體實施例之液晶顯示裝置背光模 組包έ反射腔，光源與擴散板。反射腔乃用於反射光線j 光源乃置於反射腔内。擴散板乃位於反射腔之一開口，用 以均勻化由光源所發射及由反射腔所反射之光線。擴散板 至少具有一第一區域與一第二區域，第一區域之厚度乃大 於第二區域之厚度。第一區域與第二區域之位置，乃根據 光源亮度調整，而得以提供更均勻之光線至液晶面板。當 然，依據本創作之特徵，擴散板具有三個以上不同厚度之 區域或疋匕著離光源的距離不同，而在擴散板上有著更 夕具有不同厚度的連續區域，亦屬於本創作之範圍。 根據本創作之液晶顯示裝置背光模組，背光模組之擴 散板厚度乃根據光源亮度而改變，而於不同位置具有不同 之透光度，藉此可降低未放置光源與放置光源處之亮度差 異’提供均勻度更高之光線至液晶面板。 【實施方式】 弟2圖係繪示根據本創作第一較佳具體實施例之液晶 *、、、頁示衣置月光模組側視圖。根據本創作第一較佳具體實施 例之液晶顯示裝置背光模組20，包含反射腔22，光源24 與擴散板26。反射腔22乃用以反射由光源24產生之光線， 係由邊牆22A與底板22B所組成，於邊牆22A與底板22B 之表面可塗覆一反射塗層，以增加光線之反射率。光源24 例如可為冷陰極燈管，乃規則地排列於反射腔22内。由光 源24發出，以及由反射腔22反射之光線，乃通過位於反 M255419 射腔22開口之擴散板26提供至液晶面板。 擴散板26乃用以均勻化由光源24發射，以及由反射 腔22反射之光線。擴散板26實質上呈一矩形，具有第一 區域26A與第二區域26B。第二區域鳩乃位於擴散板％ 之四周，並圍繞第一區域26A，且第一區域26A之厚度大 於第二區i或26B之厚度。第一區域26A之厚度係為一定值 T，第二區域26B之厚度則由第一區域26A之厚度τ遞減至 厚度t。ϋ減之方式例如彳呈線性遞減，$|抛物線遞減。 藉由減少第二區域26B，即擴散板26周圍之厚度，將 可使擴散板26周圍具有較大之透光度，藉此可補償由於無 法放置光源，而與第一區域26A間產生之亮度差異。 擴散板26之材料例如可為壓克力，聚碳酸酯，聚曱基 丙稀酸甲S旨’或玻璃。擴散板26可藉由射出成型方式，二 其他適當方式製造。 第3圖係繪示根據本創作第二較佳具體實施例之液 顯示裝置背光模組側視圖。根據本創作第二較佳具體實施 例之液晶顯示裝置背光模組3G，包含反射腔32，光源Μ 與擴散板36。於本較佳具體實施例中，具較大厚度之第一 區域36A乃位於對應光源34之處，以降低光源μ所在之 透光度八車乂 J、厚度之第二區域遍則位於擴散板％周 圍以此方式亦可達到均勻化擴散板中間區域與周圍區域 亮度之目的。 或，第一區域36B亦可如同第2圖中之第二區土 6B形成遞減之厚度，而更進一步補償第一區域36八與身 M255419 二區域36B間之亮度差異。 曰當然，依據本創作之特徵，擴散板具有三個以上不同 厚度之區4 ’或是隨著離光源的距離不同，而在擴散板上 有著更多具有不同厚度的連續區域，亦屬於本創作之範 圍:由上述本創作較佳具體實施例可知，應用本創作之背 光模組’可提供較均勻之光量至液晶面板，且可改善液晶 面板周圍區域由於無法放置光源，而造成亮度降低之問題。 雖然本創作已以一較佳具體實施例揭露如上，然其並 非用以限定本創作’任何熟習此技藝者，在*脫離本創作 之精神和範圍β，當可作各種之更動與潤飾，因此本創作 之保護範圍當視後附之中請專利範圍所界定者為準。 【圖式簡單說明】 由以上本創作中較佳具體實施例之細節描述，可以 對本#丨# > Η 的、觀點及優點有更佳的了解。同時參考 下列本創作之圖式加以說明： / t 1圖係、為習知技藝之液晶顯示裝置背光模組側視圖M255419 新型, new type description [Technical field to which the new type belongs] This creation relates to a backlight module for a liquid crystal display device, and more specifically, to a backlight module for a liquid crystal display device with an improved diffusion plate. [Prior art] The light of a general LCD display is provided by a backlight module. Referring to FIG. 1, a conventional backlight module 10 includes a reflection cavity i 2, a light source 14, and a diffusion plate 16. The light source 14 is mainly used to provide light and is reflected by the reflection cavity 12, and the light is applied through the diffusion plate 16. Homogenize. The diffuser plate 16 performs a light scattering treatment to atomize the light to achieve the effect of homogenizing the light. However, because the thickness of the entire diffuser plate 16 is the same, the edges and corners of the backlight module with low light intensity will be caused by the edges and corners of the liquid crystal display device after the light passes through the diffuser i 6. Dark bands cause uneven brightness on the daytime surface of the liquid crystal display device. Therefore, there is a need for an improved backlight module for a liquid crystal display device, which can provide more light and improve the problem of dark T at the edges and corners of the liquid crystal display device. [New content] Therefore, one of the objectives of this creation is to provide a backlight module of a liquid crystal display device. The thickness of the diffuser plate of the backlight module varies with the brightness of the light source, so as to provide more uniform light to the liquid crystal panel. M255419 A backlight module of a liquid crystal display device according to a preferred embodiment of the present invention includes a reflective cavity, a light source, and a diffusion plate. The reflection cavity is used to reflect light. The light source is placed in the reflection cavity. The diffuser plate is located in one of the openings of the reflection cavity to uniformize the light emitted by the light source and reflected by the reflection cavity. The diffusion plate has at least a first region and a second region, and the thickness of the first region is greater than the thickness of the second region. The positions of the first area and the second area are adjusted according to the brightness of the light source, so as to provide more uniform light to the liquid crystal panel. Of course, according to the characteristics of this creation, the diffuser plate has more than three areas with different thicknesses or the distance from the light source is different, and the diffuser plate has even more continuous areas with different thicknesses, which also belongs to the scope of this creation. According to the created backlight module of the liquid crystal display device, the thickness of the diffuser plate of the backlight module is changed according to the brightness of the light source, and has different transmittance at different positions, thereby reducing the difference in brightness between the unplaced light source and the place where the light source is placed. 'Provide more uniform light to the LCD panel. [Embodiment] Figure 2 is a side view of a moonlight module with a liquid crystal display according to the first preferred embodiment of the present invention. The backlight module 20 of the liquid crystal display device according to the first preferred embodiment of the present invention includes a reflection cavity 22, a light source 24, and a diffusion plate 26. The reflection cavity 22 is used to reflect the light generated by the light source 24, and is composed of a side wall 22A and a bottom plate 22B. A reflective coating may be applied to the surfaces of the side wall 22A and the bottom plate 22B to increase the reflectivity of the light. The light sources 24 may be, for example, cold cathode lamp tubes, which are regularly arranged in the reflection cavity 22. The light emitted from the light source 24 and reflected by the reflection cavity 22 is provided to the liquid crystal panel through a diffusion plate 26 located in the opening of the reflection cavity 22 of the M255419. The diffuser plate 26 is used to uniformize the light emitted by the light source 24 and reflected by the reflection cavity 22. The diffuser plate 26 is substantially rectangular and has a first region 26A and a second region 26B. The second region dove is located around the diffuser plate and surrounds the first region 26A, and the thickness of the first region 26A is greater than the thickness of the second region i or 26B. The thickness of the first region 26A is a certain value T, and the thickness of the second region 26B is gradually decreased from the thickness τ of the first region 26A to the thickness t. Decrement methods such as 彳 decrease linearly, $ | parabola decrease. By reducing the thickness of the second area 26B, that is, around the diffuser plate 26, the light transmittance around the diffuser plate 26 can be made larger, thereby compensating the brightness generated from the first area 26A due to the inability to place the light source. difference. The material of the diffusion plate 26 may be, for example, acrylic, polycarbonate, polymethyl acrylic acid or glass. The diffusion plate 26 can be manufactured by injection molding, or other suitable methods. FIG. 3 is a side view of a backlight module of a liquid display device according to a second preferred embodiment of the present invention. The liquid crystal display device backlight module 3G according to the second preferred embodiment of the present invention includes a reflection cavity 32, a light source M, and a diffusion plate 36. In this preferred embodiment, the first region 36A having a larger thickness is located at the position corresponding to the light source 34, so as to reduce the light transmittance of the light source μ, and the second region of the thickness is located at the diffuser plate. The% surroundings can also achieve the purpose of uniformizing the brightness of the middle area and the surrounding area of the diffuser plate in this way. Alternatively, the first region 36B may form a decreasing thickness like the second region 6B in FIG. 2, and further compensate for the difference in brightness between the first region 36B and the second region 36B of the body M255419. Of course, according to the characteristics of this creation, the diffuser plate has more than three regions 4 'of different thicknesses 4 or with the distance from the light source, there are more continuous areas with different thicknesses on the diffuser plate, which also belong to this creation Scope: As can be seen from the above-mentioned preferred embodiments of the present invention, the backlight module 'applying this creation can provide a more uniform amount of light to the LCD panel, and can improve the problem of brightness reduction due to the inability to place a light source around the LCD panel. . Although this creation has been disclosed as above with a preferred embodiment, it is not intended to limit this creation. 'Any person skilled in this art can deviate from the spirit and scope of this creation β, and can make various changes and retouches. Therefore, The scope of protection of this creation shall be determined by the scope of the attached patents. [Brief description of the drawings] From the detailed description of the preferred embodiments in the above creation, you can have a better understanding of the viewpoints and advantages of this # 丨 # > Η. Also refer to the following drawings for illustration: / t 1 is a side view of the backlight module of a liquid crystal display device, which is a conventional technique
A 圖係、9示依照本創作第一較佳具體實施例之背j 杈組側視圖。 M 二較佳具體實施例之背光 第3圖係繪示依照本創作第 模组側視圖。 背光模組 元件代表符號簡單說明】 W ， 20 ， 30 M255419 12 ， 22 ， 32 反射腔 14 ， 24 ， 34 光源 16 ， 26 ， 36 擴散板 22A 邊牆 22B 底板 26A ， 36A 第一區域 26B ， 36B 第二區域Figure A, Figure 9 shows a side view of the back frame set according to the first preferred embodiment of the present invention. The backlight of the second preferred embodiment of M. Fig. 3 is a side view of the module according to this creation. Brief description of representative symbols of backlight module components] W, 20, 30 M255419 12, 22, 32 Reflecting cavity 14, 24, 34 Light source 16, 26, 36 Diffuse plate 22A Side wall 22B Base plate 26A, 36A First area 26B, 36B Two area