Printing process and characterization of fully pad printed electroluminescent panels on curved surfaces

Bodenstein, Christina; Sauer, Hans Martin; Hirmer, Katrin; Dörsam, Edgar

doi:10.1007/s11998-019-00243-0

Cited by 12 publications

(10 citation statements)

References 10 publications

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“…First, the plate-making process allows for fabricating the gravure printing roll or printing plate with much finer resolution down to several micrometers 6 , 7 , unlike other conventional printing techniques, such as widespread screen printing, which has at least one order of magnitude lower resolution. Second, as gravure offset printing evolved from the so-called pad printing suitable for printing electronics onto nonplanar surfaces, such as electroluminescent displays (ELDs) 8 , 9 and radio-frequency identification (RFID) antennas 10 , it inherited its main feature: the pad-like blanket made of silicone polymer and wrapped around a cylinder. This blanket cylinder allows for printing on rigid substrates and improves ink transfer and printing quality.…”

Section: Introductionmentioning

confidence: 99%

AI-assisted reliability assessment for gravure offset printing system

Gafurov

Phung

Kim

et al. 2022

Sci Rep

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In printed electronics, flawless printing quality is crucial for electronic device fabrication. While printing defects may reduce the performance or even cause a failure in the electronic device, there is a challenge in quality evaluation using conventional computer vision tools for printing defect recognition. This study proposed the computer vision approach based on artificial intelligence (AI) and deep convolutional neural networks. First, the data set with printed line images was collected and labeled. Second, the overall printing quality classification model was trained and evaluated using the Grad-CAM visualization technique. Third and last, the pretrained object detection model YOLOv3 was fine-tuned for local printing defect detection. Before fine-tuning, ground truth bounding boxes were analyzed, and anchor box sizes were chosen using the k-means clustering algorithm. The overall printing quality and local defect detection AI models were integrated with the roll-based gravure offset system. This AI approach is also expected to complement more accurate printing reliability analysis firmly.

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Section: Introductionmentioning

confidence: 99%

AI-assisted reliability assessment for gravure offset printing system

Gafurov

Phung

Kim

et al. 2022

Sci Rep

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“…This characteristic gives them an original application and in the last decades, they have been used in the decorative and packaging industry for highlighting markers, in document security applications, and the tagging of postage stamps, etc. [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Properties and Colorimetric Performance of Screen-Printed Thermochromic/UV-Visible Fluorescent Hybrid Ink Systems

et al. 2021

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In the present research, properties and performance of special effect printing inks were observed with the aim of obtaining a printed product with dual functional properties. Thermochromic liquid crystal-based printing ink (TLC) and UV-visible (daylight invisible) fluorescent inks (UVF), pure and as hybrid ink systems, were printed using a screen-printing technique on two types of uncoated paper substrates. Characterization of the paper substrates was performed, as well as detailed analysis of printed layers. Thickness, surface roughness, surface free energy, and adhesion parameters of printed layers were analysed. Spectral reflectance of pure UVF and TLC printing inks, as well as the spectral reflectance of the proposed hybrid ink systems were measured. The thermochromic effect of the TLC ink and hybrid systems was analysed. Microscopy was used to display the visual colour play effect and the effect of the fluorescence. Results of the measurements showed high compatibility of used materials in the proposed hybrid ink systems. Since the effect of luminescence and the colour play effect in the hybrid systems were preserved, it can be concluded that TLC/UVF hybrid ink systems can find their application in the development of functional packaging and in all other applications with special requirements for temperature monitoring and hidden information for different products.

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“…An Electro-Luminescence (EL) display device has been printed on a curved surface using the pad-printing method, developed in [ 17 ]. The influence of the printing parameters was evaluated to produce EL panels [ 18 ]. The printing process of the latter EL device was presented in [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…The influence of the printing parameters was evaluated to produce EL panels [ 18 ]. The printing process of the latter EL device was presented in [ 19 ]. Pad-printed disposable electrode systems have been evaluated in [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Pad-Printing as a Fabrication Process for Flexible and Compact Multilayer Circuits

Jaafar

Schoinas

Passeraub

2021

Sensors

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The purpose of this paper is to present a newly developed process for the fabrication of multilayer circuits based on the pad-printing technique. Even though the maturity level, in terms of accuracy, substrate type and print size of several printing industrial processes is relatively high, the fabrication complexity of multilayer printed electronics remains relatively high. Due to its versatility, the pad-printing technique allows the superposition of printed conductive and insulating layers. Compared to other printing processes, its main advantage is the ability to print on various substrates even on flexible, curved or irregular surfaces. Silver-based inks were used for the formulation of conductive layers while UV inks were employed to fulfil the functionality of the insulating layers. To demonstrate the functionality of the pad-printing results, a multilayer test pattern has been designed and printed on Kapton®. Furthermore, to demonstrate the efficacy of this approach, a multilayer circuit composed of three stacked layers has been designed and printed on various substrates including Kapton®, paper and wood. This electronic circuit controls an array of LEDs through the manipulation of a two-key capacitive touch sensor. This study, allowed us to define recommendations for the different parameters leading to high printing quality. We expect a long-term beneficial impact of this study towards a low-cost, fast, and environmental-friendly production of printed electronics.

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Printing process and characterization of fully pad printed electroluminescent panels on curved surfaces

Cited by 12 publications

References 10 publications

AI-assisted reliability assessment for gravure offset printing system

AI-assisted reliability assessment for gravure offset printing system

Properties and Colorimetric Performance of Screen-Printed Thermochromic/UV-Visible Fluorescent Hybrid Ink Systems

Pad-Printing as a Fabrication Process for Flexible and Compact Multilayer Circuits

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