1282463 九、發明說明：1282463 IX. Description of invention:
It 【發明所屬之技術領域】 · 本發明係關於一種擴散板及背光模組，尤指一種大尺 寸之擴散板及採用該擴散板之背光模組。 【先前技術】 由於液晶顯示器面板中之液晶本身不發光，因而，為 達到顯示效果，須給液晶顯示器面板提供一面光源裝置， 如背光模組’其功能在於向液晶顯示器面板提供輝度充分 且分佈均勻之平面光，使其能正常顯示影像，因而成爲液 晶顯示器之關鍵組件之一。 隨著液晶顯示器應用領域之不斷拓展，特別是大尺寸 之應用，如筆記型電腦及液晶電視等，對於液晶顯示器之 背光模組之出光輝度進一步提高，需要使用複數光源以提 高整個背光模組之出光輝度，傳統之側光式背光模組已不 能滿足其出光輝度之要求’因此直下式背光模組成爲大尺 寸背光模組之主流。 先前技術之直下式背光模組主要由光源、擴散板及稜 鏡板等組成。其巾擴散板是重要元件之―，該擴散板將光 源發出之光線進-步散射擴散，可使得$射光線分佈更爲 均勻，從而提高背光模組之出光均勻度。 一種先前技術之背光模組如第一圖所示，該背光模組 1包括四線性光源11、一擴散板12及一稜鏡板13，該光源 11、擴散板12及稜鏡板13依次放置。 該光源11發出之光線向上出射至該擴散板12,並於該 1282463 擴散板12發生折射。因該擴散板12材質一般為透明有機 树月曰’如聚甲基丙烯酸甲酯邮⑽此巧心， PMMA)或聚碳酸酯(p〇iyCarb〇nate，pc)，且該擴散板12内 摻入有光散射粒子(圖未示），該光散射粒子可以將進入該擴 散板12之光線進一步散射，使得光線更爲均勻地射出。 請一併參閲第二圖，其中M為該背光模組i之出光區 域，N為該區域對應之出光輝度，惟，因上述之背光模組工 之光源11主要為冷陰極射線管(c〇ld Cath〇de Flu〇rescentTECHNICAL FIELD OF THE INVENTION The present invention relates to a diffusing plate and a backlight module, and more particularly to a large-sized diffusing plate and a backlight module using the same. [Prior Art] Since the liquid crystal in the liquid crystal display panel itself does not emit light, in order to achieve the display effect, the liquid crystal display panel must be provided with a light source device, such as a backlight module, whose function is to provide sufficient brightness and uniform distribution to the liquid crystal display panel. The planar light makes it display images properly, and thus becomes one of the key components of the liquid crystal display. With the continuous expansion of the application field of liquid crystal displays, especially for large-sized applications, such as notebook computers and LCD TVs, the brightness of the backlight module of the liquid crystal display is further improved, and a plurality of light sources are needed to improve the entire backlight module. The brightness of the traditional side-lit backlight module can not meet the requirements of its light-emitting brightness. Therefore, the direct-lit backlight module has become the mainstream of large-size backlight modules. The direct-type backlight module of the prior art is mainly composed of a light source, a diffusion plate, and a prism plate. The towel diffuser is an important component, and the diffuser diffuses and diffuses the light emitted by the light source to make the light distribution more uniform, thereby improving the uniformity of the light output of the backlight module. A backlight module of the prior art is shown in the first figure. The backlight module 1 includes a four-linear light source 11, a diffusion plate 12, and a sill plate 13. The light source 11, the diffusion plate 12, and the sill plate 13 are sequentially placed. The light emitted from the light source 11 is emitted upward to the diffusion plate 12, and is refracted by the diffusion plate 12 of the 1282463. Because the material of the diffusion plate 12 is generally transparent organic tree moon 曰 ' such as polymethyl methacrylate mail (10) this coincidence, PMMA) or polycarbonate (p〇iyCarb〇nate, pc), and the diffusion plate 12 is incorporated Light scattering particles (not shown) are introduced, and the light scattering particles can further scatter light entering the diffusion plate 12 to cause the light to be emitted more uniformly. Please refer to the second figure, where M is the light exit area of the backlight module i, and N is the light intensity corresponding to the area. However, the light source 11 of the backlight module is mainly a cold cathode ray tube (c). 〇ld Cath〇de Flu〇rescent
Lamp ’ CCFL)，且該光源U位於該擴散板12正下方，使 得該光源11正上方之出光區域之光線較多，出光輝度較 高，而該背光模組1其他出光區域之光線較少，出光輝度 較低，造成整個背光模組1之出光不均勻，僅通過於該擴 散板12内摻入光散射粒子，無法滿足大尺寸背光模組之出 光均勻度高之要求。 有鑑於此，提供一種出光輝度均勻之大尺寸背光模組 實為必要。 【發明内容】 本發明之目的在於提供一種出光輝度均勻之擴散板。 本發明之另一目的在於提供採用上述擴散板之背光模 組。 一本發明之擴散板包括一入光面及一與該入光面相對之 出光面，其中該入光面設置有v型槽結構，該擴散板内摻 入有光散射粒子。 本發明之背光模組包括··上述之擴散板、至少一光源 1282463 及一稜鏡板，該光源、擴散板及棱鏡板依次放置。 ， 與先前技術相比，因本發明背光模組之擴散板靠近光 源一側設置有V型槽結構，可以改變光線之傳輪方向並將 光線散射，使得該光源正上方之出光區域與該背 他出光區域均有足夠之光線出射，提高整個背光模詛之/出 光均勻度。 ^ 【實施方式】 請參閱第三圖至第四圖，本發明之背光模組2包括 四個光源21、一擴散板22及一稜鏡板23，該光源21、擴 散板22及棱鏡板23依次放置。 該擴散板22材質一般為透明之有機樹脂，如聚甲基 丙烯酸甲酯或聚碳酸酯。該擴散板22包括一入光面 及一與該入光面223相對之出光面224，該入光面223設 置有v型槽結構η，該v型槽結構221為連續分佈。該 擴散板22 -體射出成縣成，亦可以通過機械加工或者 光微影法等製成，該光源21為冷陰極射線管(c〇ldCath〇deThe light source U is located directly under the diffusing plate 12, so that the light emitting region directly above the light source 11 has more light, and the light emitting brightness is higher, and the other light emitting regions of the backlight module 1 have less light. The light emission is low, resulting in uneven light emission of the entire backlight module 1. Only by incorporating light scattering particles into the diffusion plate 12, the requirement for high uniformity of light emission of the large-sized backlight module cannot be met. In view of this, it is necessary to provide a large-sized backlight module with uniform brightness. SUMMARY OF THE INVENTION An object of the present invention is to provide a diffusing plate having uniform light luminance. Another object of the present invention is to provide a backlight module using the above diffusing plate. A diffusing plate of the present invention comprises a light incident surface and a light exiting surface opposite to the light incident surface, wherein the light incident surface is provided with a v-groove structure in which light scattering particles are incorporated. The backlight module of the present invention comprises: the above diffusing plate, at least one light source 1282463 and a slab, wherein the light source, the diffusing plate and the prism plate are sequentially placed. Compared with the prior art, the diffusing plate of the backlight module of the present invention is provided with a V-shaped groove structure near the light source side, which can change the direction of the light passing wheel and scatter the light, so that the light emitting area directly above the light source and the back There is enough light in his light-emitting area to improve the uniformity of the entire backlight module. [Embodiment] Referring to the third to fourth figures, the backlight module 2 of the present invention comprises four light sources 21, a diffusing plate 22 and a slab 23, and the light source 21, the diffusing plate 22 and the prism plate 23 are in turn Place. The diffuser 22 is generally made of a transparent organic resin such as polymethyl methacrylate or polycarbonate. The diffusing plate 22 includes a light incident surface and a light emitting surface 224 opposite to the light incident surface 223. The light incident surface 223 is provided with a v-shaped groove structure η, and the v-shaped groove structure 221 is continuously distributed. The diffusion plate 22 is formed into a county, and can also be formed by machining or photolithography, and the light source 21 is a cold cathode ray tube (c〇ldCath〇de).
Fluorescent Lamp，CCKL)。 請一併參閱第五圖，該背光模組2之光源21發出之 光線射向該擴散板22之入光面223,由於該擴散板。之 入光面223 &置有v顯結構221，光線射至該v型槽結 構221並發生折射’最終由該出光面224。該v型槽結構 =1可改變光線之傳輪方向，將光線散射，擴大出光角度， k而保也該光源21之正上方出光區域與該背光模組2之 其他出光區域均有足夠之光線射出。 1282463 請一併參閱第六圖，圖中222為該擴散板22未設置 V型槽結構221之假想底面，光線a、b、c分別為垂直於 該底面222、垂直於該V型槽結構221、以任意角度入射 之光線，由圖中可以看出，經由該V型槽結構221折射之 光線為al、bl、cl，其出射角度明顯大於經由該底面222 折射之光線a2、b2、c2 ’使得出射光線之範圍變大，從而 保證整個背光模組2之出光均勻度。且因該擴散板22内 摻入光散射粒子(圖未示），進一步將光線散射，提高整個 該背光模組2之出光均勻度。 本發明月光模組之擴散板之入光面設置有V型槽結 構該V型槽結構可以將光線折射並改變光線之傳輸方 向一使得光線散射，從而使得該光源正上方出光區域與該 =光模組之其他出光區域均有足夠之光線出射，提高整個 背光模組之出光均勻度。 曰綜上所述，本發明確已符合發明專利要件，爰依法 提出專利巾請。惟，以上所述者僅為本發明之較佳實施方 式々’、舉凡祕本紐藝之人士，在援依本案發明精神所作 之等效修贼變化，皆應包含独下之_料利範圍内。 【圖式簡單說明】 第圖係一種先前技術背光模組之平面示意圖。 第一圖係該先前技術背光模組之出光輝度示意圖。 第三圖係本發明之背光模組之平面示意圖。 第四圖係本發明之背光模組擴散板底面示意圖。 第五圖係本發明之背光模組之光路示意圖。 1282463 第六圖係本發明之背光模組與先前技術之背光模組光 路比較示意圖。 【主要組件符號說明】 光源 21 出光面 202 擴散板 22 稜鏡板 23 背光模組 2 V型槽結構 221 入光面 223 出光面 224Fluorescent Lamp, CCKL). Referring to FIG. 5 together, the light emitted by the light source 21 of the backlight module 2 is directed to the light incident surface 223 of the diffusion plate 22 due to the diffusion plate. The light incident surface 223 & is provided with a v-display structure 221, and light is incident on the v-groove structure 221 and is refracted' ultimately by the light exit surface 224. The v-groove structure=1 can change the direction of the light transmission wheel, scatter the light, and expand the light angle, and the light source area of the light source 21 and the other light-emitting areas of the backlight module 2 have sufficient light. Shoot out. 1282463 Please refer to the sixth figure. In the figure, 222 is an imaginary bottom surface of the diffuser plate 22 without the V-shaped groove structure 221, and the light rays a, b, and c are perpendicular to the bottom surface 222 and perpendicular to the V-shaped groove structure 221, respectively. The light incident at an arbitrary angle can be seen from the figure, the light refracted through the V-groove structure 221 is a1, bl, and cl, and the exit angle thereof is significantly larger than the light rays a2, b2, and c2 refracted through the bottom surface 222. The range of the emitted light is made larger, thereby ensuring the uniformity of the light output of the entire backlight module 2. Moreover, light diffusing particles (not shown) are incorporated in the diffusing plate 22 to further scatter light to improve the uniformity of light emitted from the backlight module 2. The light-incident surface of the diffusing plate of the moonlight module of the present invention is provided with a V-shaped groove structure. The V-shaped groove structure can refract light and change the direction of light transmission, so that the light is scattered, so that the light-emitting area directly above the light source and the light are The other light-emitting areas of the module have sufficient light to emit light to improve the uniformity of the light output of the entire backlight module. In summary, the present invention has indeed met the requirements of the invention patent, and the patent towel is requested in accordance with the law. However, the above-mentioned ones are only preferred embodiments of the present invention, and those who use the secrets of the New Art, the equivalent of the thief changes in the spirit of the invention, should include the scope of the exclusive Inside. BRIEF DESCRIPTION OF THE DRAWINGS The figure is a schematic plan view of a prior art backlight module. The first figure is a schematic diagram of the luminance of the prior art backlight module. The third figure is a schematic plan view of the backlight module of the present invention. The fourth figure is a schematic diagram of the bottom surface of the diffusing plate of the backlight module of the present invention. The fifth figure is a schematic diagram of the optical path of the backlight module of the present invention. 1282463 The sixth figure is a schematic diagram of the comparison of the backlight module of the present invention with the backlight circuit of the prior art backlight module. [Main component symbol description] Light source 21 Light-emitting surface 202 Diffuser plate 22 稜鏡 plate 23 Backlight module 2 V-groove structure 221 Light-in surface 223 Light-emitting surface 224
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