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Article

Effectiveness of Light Source on Detecting Thin Film Transistor

by 1,* and 2
1
Department of Marine Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 80543, Taiwan
2
Department of Engineering Science, National Cheng Kung University, Tainan 70101, Taiwan
*
Author to whom correspondence should be addressed.
Crystals 2018, 8(10), 394; https://doi.org/10.3390/cryst8100394
Received: 9 September 2018 / Revised: 17 October 2018 / Accepted: 19 October 2018 / Published: 21 October 2018
(This article belongs to the Special Issue Thin Film Transistor)
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 third and fourth 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. View Full-Text
Keywords: metal-halide lamp; quartz-halogen lamp; blue LED; TFT-LCD; spectrum metal-halide lamp; quartz-halogen lamp; blue LED; TFT-LCD; spectrum
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MDPI and ACS Style

Tzu, F.-M.; Chou, J.-H. Effectiveness of Light Source on Detecting Thin Film Transistor. Crystals 2018, 8, 394. https://doi.org/10.3390/cryst8100394

AMA Style

Tzu F-M, Chou J-H. Effectiveness of Light Source on Detecting Thin Film Transistor. Crystals. 2018; 8(10):394. https://doi.org/10.3390/cryst8100394

Chicago/Turabian Style

Tzu, Fu-Ming, and Jung-Hua Chou. 2018. "Effectiveness of Light Source on Detecting Thin Film Transistor" Crystals 8, no. 10: 394. https://doi.org/10.3390/cryst8100394

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