[[alternative]]The Studies of Optical Optimization for Large Size and Thin Thickness LED NB BLU

碩士機電工程學系[[abstract]]TFT LCD產業在被政府列為兩兆雙星重點扶植產業後，這幾年來蓬勃發展，因具有厚度薄、重量輕、高亮度、無輻射的特性，其產品應用從一開始的中小尺寸產品如手機、數位相機、PDA等，到後來的行動視訊、車用顯示器、筆記型電腦顯示器等，隨著技術的成熟，成本的降低，逐漸普及到PC監視器產業，大約在三年前TFT LCD業者更進一步將產品擴大應用在TV產品，在可預見的未來，週遭生活環境將隨處可見TFT LCD的相關產品應用。因為TFT LCD不會自發光，需要有一穩定、均勻、高亮度的背光源模組，而背光源模組的亮度、厚度、壽命也直接影響了最終的產品規格，此外背光源模組對提升色飽和度、對比及視野角也佔有關鍵因素，簡言之背光源組的發展與TFT LCD產業的發展息息相關。 筆記型電腦產品訴求主要是輕、薄、省電，為了達到上述目的，相對的背光源組只能使用厚度在3mm以下的導光板，且只能使用單邊光源入光以達到低耗電目的，在光能量有限，又要搭配導光效率較差的薄型導光板的前提下，如何提升光的利用效率，對光學設計人員絕對是一大挑戰，由於LED光源有厚度小、在一定數量下與CCFL相比相對省電、指向性光源特性，為了挑戰筆記型電腦輕、薄、省電極限，陸續有越來越多的筆記型電腦業者推出使用LED光源的高階筆記型電腦，搶攻金字塔上層的顧客需求，也引起了競相研究開發LED NB的熱潮。 本論文主要重點在研究大尺寸薄型LED NB BLU的光學可行性，如導光板的表面結構對光傳遞、出光角度及出光效益的研究，及搭配不同光學膜片的光效益研究，還有導光板端面粗糙度、結構對入光效益的研究，及LED光源與導光板作耦合對提升入光效益的研究等，以驗證使用厚度在0.6mm以下的導光板及LED光源，在大尺寸LED NB BLU的光學可行性，及光學效益最佳化產品設計方向。[[abstract]]Recently TFT LCD industry got a lot of attentions from public, due to its characteristics such as slim, light weight, no radiations. Originally it was used on the mobile phones, the digital still camera and PDA and now expands to mobile TV, car AV terminals, notebook computers and the any appliance which needs to 「display」. Thanks to the TFT LCD firms continually work to overcome the patent limitations and go through the technology bottlenecks. Besides the TFT makers, the backlight module manufactures also do their works to improve the LCD quality. Since the TFT LCD could not emit light by itself, it needs a uniform, robust and bright backlight source to light it on. A backlight module is the second high cost unit and consumes to a LCD appliance consumes the highest electrical power in a LCD appliance. Also its shape, optical characteristics and duty life determine the LCDs』. Meanwhile, it could help the LCD appliance to improve its gamut, brightness, contrast and view angle. Backlight modules are the key components of LCD appliances. The notebook computers』 backlight modules are the most challenge area in this industry, due to its requirements are slim, light weight and low power consumption. To comply these requirements, the engineers can only use slim LGPs, thickness < 3 mm, and less number of light sources. Since the new solid light source, LED, shows its advantages such as slimmer, light weight, lower power consumption and higher directivity compared to the traditional one, CCFL, there are more and more engineers adopt these new light sources as their backlight modules』 sources to achieve a new level that can not be done by CCFL. Sony and ASUS have already provided their LED notebooks to public and lead the vogue which the others chase. This thesis mainly studies the feasibility of the large size, thin thickness notebook BLU which adopts the LED as its light source. The included topics are how the surface microstructure of LGPs does influence the propagation and the exit angle of light and its extraction efficiency. Also the various film configurations, entrance surface textures and the new ways to put the LED sources are considered