Preprint Article Version 1 This version is not peer-reviewed

Effectiveness of Light Source on Detecting Thin Film Transistor

Version 1 : Received: 9 September 2018 / Approved: 10 September 2018 / Online: 10 September 2018 (14:20:19 CEST)

A peer-reviewed article of this Preprint also exists.

Tzu, F.-M.; Chou, J.-H. Effectiveness of Light Source on Detecting Thin Film Transistor. Crystals 2018, 8, 394. Tzu, F.-M.; Chou, J.-H. Effectiveness of Light Source on Detecting Thin Film Transistor. Crystals 2018, 8, 394.

Journal reference: Crystals 2018, 8, 394
DOI: 10.3390/cryst8100394

Abstract

Light sources tend to affect images captured in any automatic optical inspection (AOI) system. In this study, the effectiveness of metal-halide lamps, quartz-halogen lamps, and LEDs as the light sources in AOI systems for the detection of the 3rd and 4th layers electrodes of thin-film-transistor liquid crystal displays (TFT-LCDs) is examined experimentally. The results show that the performance of LEDs is generally comparable or better than that of metal-halide and quartz-halogen lamps. The best optical performance is by the blue LED due to its spectrum compatibility with the time-delay-integration charged-coupled device (TDI CCD) sensor and its better spatial resolution. The images revealed by the blue LED are sharper and more distinctive. Since current LEDs are more energy efficient and environmentally friendly, using LEDs as the light source for AOI is very beneficial. As the blue LED performs the best, it should be adopted for AOI using TDI CCD sensors.

Subject Areas

Metal-halide lamp, quartz-halogen lamp, blue LED, TFT-LCD, spectrum

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