Abstract
With the development of ultra-high screen-to-body ratio liquid crystal display (LCD) screen, extremely high requirements have placed on the cutting quality of LCD screen polarized film (POL). In this study, high-quality cut obtained using a 355 nm (ultraviolet light) nanosecond laser, and the cutting quality was analyzed with laser ablation process as the core. Firstly, by comprehensive experiments, narrowest heat-affected zone (HAZ) width of 12.07 ± 0.4 μm obtained when pulse repetition rate was 190 kHz, cutting speed was 40 mm/s and repeat times of laser cutting was 4, and the cross-section was smooth without obvious taper. Secondly, POL cutting mechanism with laser ablation as the core was summarized by analyzing the thermal decomposition process of POL. Finally, based on experimental results and laser ablation mechanism, effects of manufacturing parameters on cutting quality obtained. This work provides manufacturing technology reference and mechanism support for high-quality POL laser cutting.
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