A Novel Feasible Digital Laser-Blastering to Fabricate a Light-Guide-Plate of High Luminance and Efficiency for TV Application

In this paper, we propose a novel feasible method `digital laser-blastering´ (DLB) to fabricate a large-sized LED light guide plate (LGP) of high luminance and efficiency for TV application, which can be hardly achieved by other technologies. Both principle model and experimental measurement are demonstrated, and the comparisons between the experiment group and control group adopting other fabrication technology are also presented. We adopted CO₂ laser to engrave the surface of a bare PMMA plate with numbers of micro-concavities. Subsequently, we used Conoscope and BM7 to measure angular luminance and spatial luminance of the backlight unit with the DLB LGP, respectively. In the experimental results, the average spatial luminance of the experiment group with DLB LGPs increases 103-122% at most as compared to the control group, and the feasibility to be applied for the LCD TV of the size over 37 inches is demonstrated. In addition, the DLB LGP adopting an inverted-prism film (IPF) has a very narrow angular distribution in the vertical direction but a much wider in the horizontal, which is suitable especially for TV application.