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 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 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.

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.

Improved Thin Film Transistor (TFT) performance using fractionated Poly-3-hexylthiophene (P3HT)

2001 ◽  
Vol 708 ◽  
Author(s):  
Munira Raja ◽  
Giles Lloyd ◽  
Naser Sedghi ◽  
Rafaella di Lucrezia ◽  
Simon J. Higgins ◽  
...  
Keyword(s):  
Thin Film ◽  
Field Effect ◽  
Schottky Diodes ◽  
Thin Film Transistor ◽  
Drift Mobility ◽  
Process Conditions ◽  
Field Effect Mobility ◽  
Lower Field ◽  
The Third ◽  
Residual Catalyst

ABSTRACTBy using the Trznadel method, it has been possible to increase molecular weight, the regio-regularity, and probably to decrease the residual catalyst of poly-3-hexylthiophene thin films. The drift mobility of holes, normal to the surface of cast films, in air, has been found using Schottky diodes, and field-effect mobility has been measured with Thin-Film Transistors. Three types of film have been studied using the two methods of assessing mobility. The as-synthesised films are compared with those that have been fractionated. The third set of films involves doping with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ). The doped films show a field effect mobility of 0.2 cm2V-1s-1: all others being lower. Field effect mobility is approximately two orders of magnitude greater than that in the bulk normal to the plane of the film. Doping levels in the films are found to be similar, probably because of the process conditions.

Via hole technology for thin-film transistor circuits

1997 ◽  
Vol 18 (11) ◽  
pp. 523-525 ◽  
Author(s):  
H. Gleskova ◽  
S. Wagner ◽  
Q. Zhang ◽  
D.S. Shen
Keyword(s):  
Thin Film ◽  
Thin Film Transistor ◽  
Transistor Circuits ◽  
Via Hole

A Study of LED C-Like Linear Tube by Micromachining Technique for LCD Backlight Applications

2009 ◽  
Vol 419-420 ◽  
pp. 189-192
Author(s):  
Chao Heng Chien ◽  
Zhi Peng Chen
Keyword(s):  
Thin Film ◽  
Liquid Crystal ◽  
Thermal Management ◽  
Liquid Crystal Display ◽  
Thin Film Transistor ◽  
Light Sources ◽  
Cold Cathode ◽  
Optical Efficiency ◽  
Light Emitting ◽  
Fabrication Cost

In order to make the liquid crystal display (LCD) panel thinner, brighter and no-Hg containing, the light emitting diodes (LEDs) are generally beginning to replace conventional cold cathode florescent lamp (CCFL) as light sources for LCD backlight unit (BLU). The thermal management and cost are consideration caused by more LEDs used for larger size BLU. For saving the fabrication cost and considering the luminous uniformity of most commercial BLU, a novel C-like linear tube is fabricated by precision and micromachining technique. The LED C-like linear tube is not only decreasing LEDs for BLU but also increasing the optical efficiency for emitting the light into the BLU. The C-like linear tube is proposed to replace CCFL tube for thin film transistor (TFT) LCD applications.

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