• Science of Emotion and Sensibility
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• v.18 no.4
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• pp.119-128
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• 2015

The demand of reflective display devices are increasing by widespread of electronic books. In this study, the emotional and reading state for reading material of paper books, reflective display, and LCD display were compared to each other. In order to determine the consumers' sensibility of E-ink e-book the emotional assessment of three different types of books was evaluated following with readability assessment and preference experiment. These experiments controlled contents on the screen by using masks to hide hardware aspects of contents. The results of the sensibility reactions by emotional-vocabulary-experiment using semantic scale show that E-ink is closer to paper than LCD. The readability and preference questionnaire for the experimental results show that e-ink is preferred than LCD and paper was preferred or seem similar to E-ink. The conclusions shows that E-ink and paper has similar sensibility and E-ink e-book is expected to replace paper books.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.272-272
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• 2010

We have fabricated alumina thick films by inkjet printing technology. Two different types of ink system were formulated in order to understand their evaporation behaviors and their evaporation effects on the powder distribution on, the surface during inkjet-printed alumina thick films. Single solvent system was formulated with N,N-dimethylformamide(DMF), which led to coffee ring effects which non-uniformly distributed alumina particles on the substrate during the ink evaporation. However, Co-solvent system which consists of both Water and DMF produced relatively uniform distribution of the particles on the substrate. We believe that these two different distributions of alumina particles are attributed to the ink fluid flow directions in the ink droplets ejected from the different ceramic ink system. We have modulated inkjet parameters such as dot-to-dot distance, line-to-line distance, jetting velocity and jetting drop size in order to find out the optimum condition for the printing of alumina thick films from two different ink systems. The surface roughness, microstructures and dielectric properties of these inkjet-printed alumina thick films were investigated.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.74-79
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• 2003

한글위주의 스크립트를 전자 잉크 데이터(electronic ink data)형태로 Pocket PC에서 사용하기 위한 한글 매칭 알고리즘을 적용하여 시스템을 구현하였다. 적용된 한글 매칭 알고리즘은 전자잉크데이터(electronic ink data)를 스크립트 형태로 변화한 후 이를 다이나믹 프로그래밍 기법을 사용하여 시스템을 구현한다. Pocket PC의 하드웨적 제약을 고려하여 효율적인 속도를 보장하면서 인식률을 높이기 위해 기본 획을 인식한 후, 획 정보와 획간의 위치관계를 이용하여 자소로 분리된 데이터의 값으로 변환하여 이를 CF메모리상에 있는 통계적 수치 데이터로 저장된 한글 데이터의 값과 비교하여 한글을 인식할 수 있는 시스템 구현에 목적이 있다.

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.1118-1121
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• 2009

We have fabricated inverted staggered pentacene Thin Film Transistor (TFT) with 1-${\mu}m$ channel length by micro contact printing (${\mu}$-CP) method. Patterning of micro-scale source/drain electrodes without etching was successfully achieved using silver nano particle ink, Polydimethylsiloxane (PDMS) stamp and FC-150 flip chip aligner-bonder. Sheet resistance of the printed Ag nano particle films were effectively reduced by two step annealing at $180^{\circ}C$.

• Electrical & Electronic Materials
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• v.11 no.4
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• pp.350-354
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• 1998

• Proceedings of the Materials Research Society of Korea Conference
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• 2010.05a
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• pp.19.1-19.1
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• 2010

The process of manufacturing printed electronics using printing technology is attracting attention because its process cost is lower than that of the conventional semiconductor process. This technology, which offers both a lower cost and higher productivity, can be applied in the production of organic TFT (thin film transistor), solar cell, RFID(radio frequency identification) tag, printed battery, E-paper, touch screen panel, black matrix for LCD(liquid crystal display), flexible display, and so forth. In general, in order to implement printed electronics, narrow width and gap printing, registration of multi-layer printing by several printing units, and printing accuracy of under $20\;{\mu}m$ are all required. These electronic products require high precision to the degree of tens of microns - in a large area with flexible material, and mass productivity at low cost. As such, the roll-to-roll printing process is attracting attention as a mass production system for these printed electronic devices. For the commercialization of this process, two basic electronic ink technologies, such as conductive ink and polymers, and printing equipment have to be developed. Therefore, this paper addressed basis design and test to develop fine patterning equipment employing the roll-to-roll printing equipment and electronic ink.

• 한국정보디스플레이학회:학술대회논문집
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• 2004.08a
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• pp.188-190
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• 2004

As an effort to reduce cost and lead-time and to increase flexibility and responsiveness, manufacturers are using digital printing in numerous process steps. Typically, these processes require the precise dispensing of various fluids. Piezo ink jet printheads are proving to be reliable tools for depositing active materials such as light emitting polymers (LEP) for mobile phone displays and color filter inks for liquid crystal displays. Ink jets are also being used to provide uniform coatings of polyimide alignment layers and spacers for LCDs. Success with legend printing on PCBs using ink jets has encouraged the design of equipment for directly printing both etch resist and solder mask for PCBs. Development of printers for passive components such as capacitors and resistors is underway. This paper will present the attributes of an ink jet printhead designed to a precision deposition tool and discuss how it is being used to digitally print electronic and flat panel display components. Status of commercialization of digital printing will be discussed along with issues to be resolved before wide adoption takes place.

• 한국정보디스플레이학회:학술대회논문집
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• 2003.07a
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• pp.157-162
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• 2003

Piezoelectric ink jet offers a promising combination of productivity, reliability and uniformity that are appropriate for jetting organic electronic materials. Spectra is manufacturing a printhead specifically for display manufacturing. This printhead contains a robust material set and is intended to allow calibration of individual nozzles to meet uniformity requirements of+/-2% for display manufacture.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.673-675
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• 2005

Ink jet printheads are now widely used in manufacturing processes that require precise dispensing of materials. Today, Dimatix manufactures a variety of drop-on-demand ink jet printheads for the industrial printing market, but emerging opportunities present fresh challenges to our technology. In response to requirements for digitally printing on flexible substrates and dispensing novel electronic fluids, we are developing next generation jetting technology based on our three-dimensional silicon MEMS technology with a piezo-driven pumping chamber integrated into the chip structure. This presentation will address the functional and physical design features and properties of Dimatix's MEMS process, its characteristics, reliability and usability. Examples of opportunities and applications for digitally printing electronic fluids on flexible substrates with MEMS-based ink jet technology will be presented.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.66-66
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• 2010

잉크젯용 저온 Cu ink의 소성 특성을 향상 시키기 위해 소성 분위기롤 조절 하였다. 일반적으로 Cu는 산화가 잘되는 물질로 환원 분위기에서 소성이 이루어져야만 하기 때문에 acid, alcohol, aldehyde, ether와 같은 환원제를 소성시 사용하였다. 또한 1종의 환원제가 아닌 2종의 환원제롤 일정 비율로 섞음으로써 환원력를 조절하여 소성 품질을 향상 시킬 수 있었으며, 이러한 환원 분위기 조절을 통하여 300도 이하 저온에서 소성이 가능하였다. 또한 optical microscopy와 field emission scanning electron microscopy를 통해 막 품질과 미세조직의 치밀도를 확인하였고 배선 재료로써의 적용을 위해 resistance를 측정 비교하였다.