A Novel Continuous Extrusion Process to Fabricate Wedge-Shaped Light Guide Plates

Abstract EN

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.

The temperature of the bottom heater and roller was adjusted to reduce the surface deformation of the wedge-shaped plate.

This continuous extrusion system can successfully manufacture wedge-shaped LGPs for mass production.