Earticle

본 논문은 금속에 72도 V형상의 광학 미세 패턴을 주어 광 산란 효과에 대한 연구이다. V형상의 각도를 72도로 주어 실제처럼 시각적 효과를 얻기 위해 다양한 시뮬레이션을 실시하였다. 3D CAD 랜더링 설계와 조명 프로그램을 이용한 시뮬레이션으로 광 산란에 대한 결과를 얻을 수 있었다. 72도 V패턴의 빛의 산란 정도를 통해 여러 디스플레이에 적용이 가능함을 알 수 있었고, 시각적인 특성도 있음을 분석을 통해 알 수 있었다. 미세광학패 턴의 광 산란 효과를 통한 편안함과 부드러움, 자연친화적 이미지를 제공으로 신뢰성 평가기술을 확보할 수가 있었다.

The This paper is a study on the light scattering effect by giving optical fine pattern of 72°V shape to metal. Various simulations were performed in order to obtain a visual effect as realistic given the angle of the V shape at 72 degrees. The result of light scattering was obtained by 3D CAD rendering design and simulation using lighting program. We can see that it can be applied to various displays through the scattering degree of light of 72°V-patterns. The light scattering effect of the micro optical pattern provides comfort, softness, and nature friendly image, thus ensuring reliability evaluation technology..

최근 휴대용 정보전자기기의 비약적인 사용의 증가는 충격에 보다 강한 디스플레이에 대한 연구를 발전시키는 계기가 되었다. 일부제 조회사에서 AMOLED를 사용한 디스플레이에서 유연한 특성을 가진 제품을 선보이고 있으나, 그 사용량에 있어서 압도적으로많은 부 분을 차지하고 있는 것은 LCD 이다. 특히 LCD는 구조적인 문제로 인하여 반드시 후면광원을 사용하여야 하는데, 면발광형식의 조광 장치를 얇은 두께로 구현하는데 사용되는 것이 아크릴 재질의 도광판이다. 본 연구에서는 유연하지 않은 메틸메타아크릴레이트에 부 틸 아크릴레이트 고무계열의 합성재료를 첨가하여 유연성을 유지하고, 투과율을 90%까지 상승시킨 KURARITY 라는재질을 사용한 패 턴의 설계 및 성형 결과를 통해서 유연한 후면광원의 가능성을 평가하는데 주력하였다. 평가 결과 기존의 광원과동일한 수준의 밝기 및 휘도 균일도를 얻을 수 있었다.

We have designed high performance flexible prism light-guide plate (LGP) in 5 inch TFT-LCD for mobile applications. We adopted novel material such as methacrylate and butyl acrylate mixture, as it called KURARITY. It has good flexibilityby addition of butyl acrylate. And it has also good transmissivity because methacrylate is a major compound. Then, weachieved good test result to embody high brightness and flexible BLU in case of LGP of base and upper surface with 5inch, thickness 1.5mm adding prism construct, it is superior brightness improvement than previous flexible LGP. It showssignificant improvement than previous printing form about some 5% and in this course to flexible embody actual materialit succeeded prism LGP production by 5 inch injection form process.

In this study, the change of optical characteristics was studied according to the micro optical pattern provided by photo lithography followed by thermal reflow process. The shape and luminance variation with micro pattern was evaluated by SEM and spectrometers. Also, we analyzed the luminance characteristics using the 3D-optical simulation (Optis works) program. As a result, we found that the radius of curvature(R) in micro pattern is decreased up to 77%($150^{\circ}C$) compared to the radius of curvature at the condition $100^{\circ}C$, which is caused by efficient reflow of organic material without chemical changes. The highest enhancement of brightness with optimum micro pattern was obtained at the condition of $120^{\circ}C$ reflow process. The brightness gain with optical micro patterns is more than 15% at the condition of R=16.95 um, ${\Theta}=77.14^{\circ}$ compared to original optical source. The results of light simulation with various radius of curvature and side angle of pattern shows the similar result of experiment evaluation of light behavior on optical micro patterns. It is regarded that the more effect on light enhancement was contributed by side angle which is effective factor on light reflection, rather than the curvature of micro-patterns.

It is well known that Morpho butterflies show distinctive, brilliant and iridescent colors and have micro-nano scale structures, instead of dyes and pigments, on their wings. This structural coloration is regarded as a novel technique to express color with a long lifetime, ease and precise tenability. Here, we studied optical multilayer thin films with thickness of several tens of nm ($TiO_2$ and $SiO_2$) and lens-shape micro-patterns. Fabrication and characterization of the multilayer stacking structure and the micro-pattern structure were performed and the films were analyzed via several optical measuring techniques. Finally, we discussed how the micro-pattern structure could enhance independence with color changes according to the viewing angle.

현재의 전자빔 묘화의 한계를 극복할 수 있는 마이크로 전자빔 시스템의 전자 광학 렌즈를 제작하였고 전자빔 묘화실험을 통하여 이를 검증하였다. 마이크로머시닝기술을 이용하여 실리콘 전극을 제작하고 이를 양극 접합을 통해 조립하여 다층 전극의 전자 광학 렌즈를 제작하였다. 완성된 전자 광학 소자를 초고진공 챔버에 장착하여, STM(Scanning Tunneling Microscope) 팁에서 방출된 전자빔의 focusing 특성을 관찰하였으며 전자를 집속하여 리소그라피를 수행하였다. E-beam 감광막은 PMMA(Poly-methylmethacrylate)를 사용하였고 0.13㎛의 패턴을 형성시킬 수 있었다.

We have fabricated electron-optical lens for micro E-beam system that can overcome the limitation of current E-beam lithography. Our electron-optical lens consists of multiple silicon electrodes which were fabricated by micromachining technology and assembled by anodic bonding. The assembled system was installed in UHV chamber to observe the emission characteristics of focused electrons by the electro-optical lens. We used STM(Scanning Tunneling Microscope) tip for electron source. By performing lithography with the focused electrons with PMMA(poly-methylmethacrylate) as E-beam resist. We could draw 0.13${\mu}{\textrm}{m}$ nano-scale lines.