• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.388-389
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• 2007

A transflective liquid crystal displays driven by fringe field switching mode of new concept is being suggested. The FFS mode is known to have the different twist angle distribution at the position when an operating voltage is applied. We make the cell design by using the different twist angle which has some region decided on transmissive region and other region used to reflective region. By optimizing simulation condition in the concept, we proposed new tansflective LCDs using FFS mode with single gap and single gamma characteristics.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2004.11a
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• pp.567-570
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• 2004

We have designed a single gap transflective liquid crystal display (LCD) driven by a fringe electric field, in which the LCs are homogeneously aligned in the initial state. In the reflective and transmissive areas, the degrees of the rotation of the LC director are $22.5^{\circ}$ and $45^{\circ}$, respectively. Utilizing this mechanism and an in-cell retarder with a quarter-wave plate that is used below the LC layer, the transflective LCD using fringe-field switching (FFS) mode is realized.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.394-395
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• 2007

In order to make full color cholesteric displays, color filter-less R, G, B sub-pixel structured cholesteric LC cells have been studied. To make R, G, B colors, UV induced pitch variant chiral dopant was added to cholesteric LC mixtures. The concentration of the photo-sensitive chiral dopant was adjusted so that the initial state showed blue color and the color was changed from blue to green and red with increase of UV irradiation to the cholesteric cells. To prevent the mixing of R, G, B reflective sub-pixel liquid crystals, separation walls were formed using negative photo resister in boundary area between sub-pixels. Through the optimization of the material concentrations and UV irradiation condition, vivid R, G, B colors were achieved.

• Transactions on Electrical and Electronic Materials
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• v.11 no.3
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• pp.134-137
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• 2010

We have proposed a transflective liquid crystal display (LCD) driven by the fringe field using a liquid crystal (LC) with a negative dielectric anisotropy. The device used different twist angles of the liquid crystals (LC) in the transmissive (T) and the reflective (R) regions when voltage is applied. With the optimization of the pixel electrode width and the distance between them, the LC directors in the R- and T-regions can be rotated by about $22.5^{\circ}$ and $45^{\circ}$ on an average, respectively. As a result, a high image quality transflective LCD with a single gap, a single gamma, and a wide viewing angle characteristics in both the R- and T- regions can be realized.

• Korean Journal of Optics and Photonics
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• v.12 no.3
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• pp.235-239
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• 2001

In this paper, we propose an optical configuration of a reflective AFLC display mode using a half-wave AFLC cell in which inplane tilt angle is $22.5^{\circ}C$. To check the validity of our design, we fabricate a reflective half-wave AFLC cell of which the in-plane tilt angle is $24.9^{\circ}C$, and measure viewing angle and visible spectra characteristics. In the results, the half-wave AFLC cell in the reflective configuration exhibits wide viewing-angle as well as high brightness and contrast. trast.

• Proceedings of the Optical Society of Korea Conference
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• 2002.07a
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• pp.216-217
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• 2002

액정표시소자(Liquid Crystal Device)가 흑백의 문자표시소자로 개발된 이래로, 설계 기술 및 제조기술의 발전으로 그 응용분야도 현저히 확대퇴고 있다. 그 응용분야 가운데 노트북 컴퓨터, 휴대전화, IMT-2000, 전자책(e-book)등 최근 현저한 진보를 보이고 있는 정보통신기기들은 그 휴대성 때문에 좀더 가볍고, 얇으며, 소비전력이 적은 디스플레이 소자를 요구하고 있다. 이러한 조건을 만족시키기 위해 무겁고 전력소모가 많은 배면조명을 사용하지 않는 반사형 액정표시소자 연구가 활발하다. (중략)

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.780-783
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• 2008

Low-loss optical films can be used in LCD backlights to improve the display efficiency. Improvements can be used to enhance display performance, increase functionality and reduce energy costs.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.167-170
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• 2008

$Reflex^{TM}$ display technology based on bistable, reflective, and flexible Cholesteric Liquid Crystal Displays is being developed and mass produced for new and non-traditional applications. These applications allow for personalization of mobile devices, very low cost display systems, and more. This display technology, its status, and new applications are discussed in this paper.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.556-559
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• 2002

We designed a low cost optical structure of transflective LCD that uses only a half number of retardation films compared to general active matrix transflective LCD. The prototype embodied by this design shows reasonable reflective and transmissive performance. This design would provide us thinner, lighter and cheaper product due to its reduced retardation film structure.

• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.114-115
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• 2003

LCD(Liquid Crystal Display)는 현재 정보 디스플레이 소자들 중 부피가 작고, 소비전력이 작으며, 비발광체로서 눈의 부담을 줄일 수 있는 장점을 가지고 있으나, 화면 표시 속도가 느려 잔상이 남는 단점이 있다. 이러한 단점을 개선하기 위해서는 응답속도가 빠른 액정이 요구된다. 반사형 LCD는 배면조명이 없어 가볍고, 주변 광원을 이용하여 저 소비전력의 장점을 가지고 있어 휴대성이 강조되고 있는 최근 정보통신기기들의 추세에 적합하다. (중략)