Wen-Tse Hsiao, Jui-Chang Lin, Keng-Shiang Huang, Chih-Hui Yang, Alexandru Mihai Grumezescu, Shih-Feng Tseng, Yung-Sheng Lin: A novel continuous extrusion process to fabricate wedge-shaped light guide plates. International Journal of Polymer Science, 2013, 610132, 2013.
Backlight modules are key components in thin-film transistor liquid crystal displays (TFT-LCD). Among the components of a backlight module, the light guide plate (LGP) plays the most important role controlling the light projected to the eyes of users. A wedge-shaped LGP, with its asymmetrical structure, is usually fabricated by an injection proces, but the fabrication time of this process is long. This study proposes a continuous extrusion process to fabricate wedge-shaped LGPs.This continuous process has advantages for mass production. Besides a T-die and rollers, this system also has an in situ monitor of the melt-bank that forms during the extrusion process, helping control the plate thickness. Results show that the melt bank has a close relationship with the plate thickness.Thetemperature of the bottomheater and rollerwas adjusted to reduce the surface deformation of thewedge-shaped plate. This continuous extrusion system can successfully manufacture wedge-shaped LGPs for mass production.