scholarly journals Effectiveness of Light Source on Detecting Thin Film Transistor

Crystals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 394 ◽  
Author(s):  
Fu-Ming Tzu ◽  
Jung-Hua Chou
Keyword(s):  
Thin Film ◽  
Light Source ◽  
Thin Film Transistor ◽  
Metal Halide ◽  
Light Sources ◽  
Blue Led ◽  
Optical Inspection ◽  
Metal Halide Lamps ◽  
Better Than ◽  
Halogen Lamps

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.

scholarly journals Effectiveness of Light Source on Detecting Thin Film Transistor

2018 ◽  
Author(s):  
Fuming Tzu ◽  
Jung-Hua Chou
Keyword(s):  
Thin Film ◽  
Light Source ◽  
Thin Film Transistor ◽  
Metal Halide ◽  
Light Sources ◽  
Blue Led ◽  
Optical Inspection ◽  
Metal Halide Lamps ◽  
Better Than ◽  
Halogen Lamps

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.

scholarly journals Light Emitted Diode on Detecting Thin-Film Transistor through Line-Scan Photosensor

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 434
Author(s):  
Fu-Ming Tzu ◽  
Jung-Shun Chen ◽  
Shih-Hsien Hsu
Keyword(s):  
Thin Film ◽  
Light Source ◽  
High Spatial Resolution ◽  
Thin Film Transistor ◽  
Light Sources ◽  
Charge Coupled Device ◽  
Blue Led ◽  
The Third ◽  
Optical Inspection ◽  
Via Hole

This paper explores the effectiveness of the white, red, green, and blue light emitted diodes (LEDs) light sources to detect the third layer of the electrode pixel and the fourth layer of the via-hole passivation on thin-film transistors. The time-delay-integration charge-coupled device and a reflective spectrometer were implemented in this experiment. The optical conditions are the same, as each light source and the digital image’s binary method also recognize the sharpness and contrast in the task. Consequently, the white and the blue LED light sources can be candidates for the light source for the optical inspection, especially for monochromic blue LED’s outperformance among the light sources. The blue LED demonstrates the high spatial resolution and short wavelength’s greater energy to trigger the photosensor. Additionally, the metal material has shown a tremendous responsibility in the photosensor with 150 Dn/nj/cm2 over the sensibility. The mercury 198Hg-pencil discharge lamp emits the stable spectral wavelength to significantly calibrate the spectrometer’s measurement.

scholarly journals Photobiocatalytic alcohol oxidation using LED light sources

2017 ◽  
Vol 19 (2) ◽  
pp. 376-379 ◽  
Author(s):  
M. Rauch ◽  
S. Schmidt ◽  
I. W. C. E. Arends ◽  
K. Oppelt ◽  
S. Kara ◽  
...  
Keyword(s):  
Light Source ◽  
Photocatalytic Oxidation ◽  
Alcohol Oxidation ◽  
Light Sources ◽  
Blue Led ◽  
Led Light

The photocatalytic oxidation of NADH using a flavin photocatalyst and a simple blue LED light source is reported.

Metal halide lamps: Gravitational influence on color separation

2006 ◽  
Vol 78 (6) ◽  
pp. 1239-1252 ◽  
Author(s):  
W. W. Stoffels ◽  
A. J. Flikweert ◽  
T. Nimalasuriya ◽  
J. J. A. M. van der Mullen ◽  
G. M. W. Kroesen ◽  
...  
Keyword(s):  
Large Scale ◽  
High Efficiency ◽  
Numerical Models ◽  
Metal Halide ◽  
Light Sources ◽  
Color Separation ◽  
Gravitational Influence ◽  
Metal Halide Lamps ◽  
And Diffusion ◽  
Diffusion Flows

Metal halide lamps are very efficient light sources based on a Hg plasma arc with metal halide salt additions. In spite of their high efficiency, the lamps suffer from several problems, such as color separation and instabilities, which currently hinder large-scale use. These phenomena are caused by a complex interaction of convection and diffusion flows in the plasma. In order to unravel the various contributions, experiments under microgravity have been performed where convection is absent. The experiments confirm the previously held qualitative views, but also provide absolute data on densities and temperatures that will be used to validate numerical models of these lamps.

scholarly journals Detection of Electrical Circuit in a Thin-Film-Transistor Liquid-Crystal Display Using a Hybrid Optoelectronic Apparatus: An Array Tester and Automatic Optical Inspection

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 964
Author(s):  
Fu-Ming Tzu ◽  
Jung-Shun Chen ◽  
Shih-Hsien Hsu
Keyword(s):  
Thin Film ◽  
Liquid Crystal ◽  
Liquid Crystal Display ◽  
Thin Film Transistor ◽  
Electrical Circuit ◽  
Charge Coupled Device ◽  
Automatic Optical Inspection ◽  
Multiple Line ◽  
Optical Inspection ◽  
A Charge

In this study, we developed a high-resolution, more accurate, non-destructive apparatus for refining the detection of electrode pixels in a thin-film-transistor liquid-crystal display (TFT-LCD). The hybrid optoelectronic apparatus simultaneously uses an array tester linked with the automatic optical inspection of panel defects. Unfortunately, due to a tiny air gap in the electro-optical inspector, the situation repeatedly causes numerous scratches and damages to the modulator; therefore, developing alternative equipment is necessary. Typically, in TFT-LCDs, there are open, short, and cross short electrical defects. The experiment utilized a multiple-line scan with the time delay integration (TDI) of a charge-coupled device (CCD) to capture a sharp image, even under low light, various speeds, or extreme conditions. In addition, we explored the experimental efficacy of detecting the electrode pixel of the samples and evaluated the effectiveness of a 7-inch opaque quartz mask. The results show that an array tester and AOI can detect a TFT-LCD electrode pixel sufficiently; therefore, we recommend adopting the hybrid apparatus in the TFT-LCD industry.

Application of LED in Marine Fishery

2013 ◽  
Vol 765-767 ◽  
pp. 213-216
Author(s):  
Wen Qing Shi ◽  
Zheng Ye Xiong ◽  
Yong Qiang Li ◽  
Cun You Huang
Keyword(s):  
High Energy ◽  
Economic Benefits ◽  
Metal Halide ◽  
Light Sources ◽  
Market Demand ◽  
Led Light ◽  
Marine Fishery ◽  
Incandescent Lamps ◽  
Metal Halide Lamps ◽  
Chinese Marine

Aiming at the high energy-consuming characteristics of Chinese marine fishery, the application of LED in Chinese marine fishery is analyzed. It has remarkable energy-saving effect if the fishing style of trawling is replaced by light-seine fishing, and the gathering-fish lamps of metal halide lamps or incandescent lamps are replaced by LED light sources. The conversion of the trawlers to light-seine vessel and widespread use of LED light sources will lead to cut down energy consumption and increase the economic benefits. Based on rough calculation, it can make Chinese fisherfolk increase income about hundreds of millions of dollars and reduce more than millions of tons CO2 emission if the conversion of the trawlers to light-seine vessel and the replacement of metal halide lamps or incandescent lamps to LED light sources can reach 20% of all. Moreover, LED light source can use for general lighting purpose in marine fishery. All of these will cause the development of the correlative industries. For instance, the market demand of LED is very vast.

Light sources selection for solar simulators: A review

2020 ◽  
pp. 28-46
Author(s):  
Deepak ◽  
Shubham Srivastava ◽  
C. S. Malvi
Keyword(s):  
Light Source ◽  
Solar Spectrum ◽  
Energy Utilization ◽  
Light Sources ◽  
Halogen Lamp ◽  
Solar Thermal Energy ◽  
Solar Simulator ◽  
Cloudy Weather ◽  
Carbon Arc ◽  
Metal Halide Lamps

Solar energy has certain limitations such as seasonal variations, cloudy weather etc. Because of these limitations, it is very difficult to perform the experiments in Rainy and winters seasons. To tackle this problem, we have to use solar simulators. It is source of artificial lights, very much similar to concentrated sunlight. It can be analyzed that increased demand in manufacturing and development of solar simulators for testing and simulation of solar photovoltaic and solar thermal energy utilization. This paper reviews the solar simulator light sources for testing photovoltaic panels as well as for thermal applications. Light intensity, cost, durability and stability were included as a criterion for comparing solar spectrum with lamp wavelength spectrum. The classification of solar simulator depend on the light source application and their technological innovations were considered according to the literature. Also, carbon arc lamp, argon lamp, high pressure sodium lamps, quartz tungsten halogen lamp, mercury xenon lamps, xenon arc lamps, metal halide lamps, LEDs and super continuum laser are discussed in details. Also, multi light source solar simulator discussed as a separate topic.

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