| 1. |
- Hegde, Gurumurthy, 1979, et al.
(författare)
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Electrically Controlled Birefringence Colors in Deformed Ferroelectric Liquid Crystals
- 2008
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Ingår i: Liquid Crystals. - 0267-8292. ; 35:9
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Tidskriftsartikel (refereegranskat)abstract
- A short helix pitch (p050.45 mm) ferroelectric liquid crystal (FLC) mixture was found to provide four electrically switched birefringence colours: blue, green, yellow and red. The contrast ratios of the birefringence colours were measured as functions of both driving voltage amplitude and frequency. The FLC mixture, which had a relatively high birefringence, Dn>0.2, was controlled by a voltage less than 5V. A simple model is proposed, which was confirmed by experiments. A possible application is discussed in field-sequential colour displays, where fast switching times are required.
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| 2. |
- Hegde, Gurumurthy, 1979, et al.
(författare)
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Electrically controlled birefringent colors of Smectic C* Deformed Helix Ferroelectric Liquid
- 2008
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Ingår i: Ferroelectrics. - : Informa UK Limited. - 0015-0193 .- 1563-5112. ; 365
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Konferensbidrag (refereegranskat)abstract
- Short helix pitch (p0 = 0.45 μm) ferroelectric liquid crystal (FLC) mixture possessing high birefringenc under the action of applied voltage not more than 5 V provides four electrically switched birefringent colors: blue, green, yellow and red, while before only two [1] or three [2] colors were switched. Contrast ratio of birefringence colors were measured dependently on the driving voltage frequency. A possible application in field sequential color display where fast switching time is required has been proposed.
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| 3. |
- Hegde, Gurumurthy, 1979, et al.
(författare)
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“Inherent Continuous, Hysteretic Free and Memorized Gray Scale of FLC Display Cells Based
- 2008
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Ingår i: Ferroelectrics. - : Informa UK Limited. - 0015-0193 .- 1563-5112. ; 364
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Konferensbidrag (refereegranskat)abstract
- Ferroelectric liquid crystal (FLC) mixtures with high spontaneous polarization (Ps > 50 nC/cm2) possessing ferroelectric domains [1] exhibit a multistability effect which has been known for more than 10 years [2, 3]. Any light transmission level can be memorized in the effect after the driving voltage is switched off. The multistability effect is responsible for three new electrooptical modes with continuous, memorized and reversible gray scale. Depending on the asymmetry in boundary conditions and crystallooptical parameters of the cell, these modes differ among themselves under the shape of the gray scale curve that can be either S (double or single) or V-shaped. Origin of the phenomenon is under consideration here.
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| 4. |
- Hegde, Gurumurthy, 1979, et al.
(författare)
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Plasma Beam Alignment Technique for Ferroelectric Liquid Crystals
- 2008
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Ingår i: Journal of the Society for Information Display. - 1071-0922. ; 16:10
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Tidskriftsartikel (refereegranskat)abstract
- The plasma-beam alignment procedure earlier developed for the alignment of nematic liquid crystals is successfully extended to ferroelectric liquid crystals (FLC). The highly uniform alignment of the “chevron” structure (before electrical treatment of FLC cells) and “quasi bookshelf” structure (after the electrical treatment) are realized. The contrast of bistable switching larger than 350:1 is achieved. This makes the non-contact plasma-beam alignment procedure especially attractive for high-contrast bistable LCDs on an LCOS base, particularly used in PDA and e-books. Fast switching and realization of gray scale in the plasma-beam aligned FLC cellsmakes this technique also promising for full-color displays including color LCD TV.
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| 5. |
- Valyukh, Sergiy, et al.
(författare)
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A Liquid Crystal Lens with Non-uniform Anchoring Energy
- 2008
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Ingår i: SID Digest, 2008. ; , s. 659-662
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Konferensbidrag (refereegranskat)abstract
- The study of a tunable liquid crystal lens having a uniform cell gap, uniform applied voltage and non-uniform anchoring energy was done. Optimal parameters of such a lens were found and discussed. We demonstrated that producing a desired director gradient profile with non-uniform spatial distribution of the anchoring energy is a good alternative for other known methods applied for liquid crystal lenses.
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