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Conference Paper
Black Dye Doped LCD without Polarizers
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- Authors
- Gi Heon Kim, Won-Jae Lee, Yong Hae Kim
- Issue Date
- 2015-08
- Citation
- International Meeting on Information Display (IMID) 2015, pp.1-1
- Language
- English
- Type
- Conference Paper
- Abstract
- Guest-host liquid crystal display (Gh-LCD) for transprent display that anisotropc dyes dissolved in LC phase, has been extrnsively investigated since its invention in the 1960s because of optical (wide viewing angle, high brightness and outdoor redability) and physical (thinner thickness, light weight) properties. The tranraprent LCD without polarizers can reduce the light leakage and power consumption, however, the contrast ratio is low because it cannot obtain a perfect dark phase. In this study, polarizer-free LCDs were prepared by doping black dye into nematic LC (B-LC). Black dyes induces selective light absoprtion by mean of an electric field. An alignment layer for hometropic orientation of black dye doped LC mixtures (vertical alignment mode) was used. We developed a 3.5-inch active matirx TFT transprarent LCD and a 3-inch passive matrix LCD by using B-LC technology. The black dye doped LC cell is composed of samdwiched glass substrates with ITO electrode and B-LC layer. The unrubbed PI film (thickness, 110 nm) was used as an alignemnt layer. The gap of the cells was controlled by using a ball spacer. The B-LC mixture was introduced into sandwitched substrates by mean of modified ODF (one drop fill) method ar room temperature. The obtained black dye doped LCD exhibits good optical performance, fast response time (Tr, 30ms; Tf, 44ms) of on/off operation and low driving voltage (< 2.5V). Electro-optic behavior of the cell was dependent on cell gap, chemical structure and content of black dye and PI film thickness.
- KSP Keywords
- Alignment layer, Cell gap, Dye-doped, Electric Field, Film thickness, Glass substrate, Guest-host, High brightness, ITO electrode, Light-weight, Liquid crystals(LCs)