Electrooptical displays

Liquid crystal polymers are also used in electrooptic displays. Side-chain polymers are quite suitable for this purpose, but usually involve much larger elastic and viscous constants, which slow the response of the device (33). The chiral smectic C phase is perhaps best suited for a polymer field effect device. The abiHty to attach dichroic or fluorescent dyes as a proportion of the side groups opens the door to appHcations not easily achieved with low molecular weight Hquid crystals. Polymers with smectic phases have also been used to create laser writable devices (30). The laser can address areas a few micrometers wide, changing a clear state to a strong scattering state or vice versa. Future uses of Hquid crystal polymers may include data storage devices. Polymers with nonlinear optical properties may also become important for device appHcations. 

Electrooptic displays, liquid crystal polymers in, 75 110 Electrooptic effect, 74 675 Electrooptic modulation, second-order nonlinear optical materials for, 77 444... 

Correlations between molecular structure and the LC state have been fruitfully employed to design 4-alkyl and 4-alkoxy-4 -cyanobiphenyls, which form the basis for electrooptic display devices. The reasoning behind the design of these nematogens is as follows. In a family of nematogens of the general formula... 

A. R. Kmetz and F.K. Von Willisen (Eds.), Non-Emissive Electrooptic Displays, Plenum Press, New York, 1976. 

Kmetz AR, Willisen FK (1976) Non-emissive electrooptic displays. Plenum, New York Inganas O, Lundstrom I (1987) Synth Mel 21 13... 

Certain aryl amines are endowed with unusual electronic properties. Schiff s bases such as 4-methoxybenzylidene-4-n-butylaniline were the original experimental chemicals used in the early development of electrical and electrooptical displays. Liquid crystal display (LCD) technology relies on twisted nematic or supertwisted nematic effects. Later nematogen development was based on cyanobiphenyls103. 

Sage, I. Materials Requirements for Nematic and Chiral Nematic Electrooptical Displays. In Thermotropic Liquid Crystals-, Gray, G. W., Ed. Wiley Chichester, 1987 Chapter 3, pp 64-98. 

Figure 24. Biomesogenic structures a) (Bio)meso-gens displaying order-disorder distributions in CPK-presentation (left to right and top to bottom) hexa-n-alkanoyl-oxybenzene discoid - Chandrasekar s first non-rodlike liquid crystal [28 a, 51c] enantiomeric cholesteric estradiol- and estrone-derivatives [ 17 a, c, d, 26 f, 51 a, s, u] Reinitzer s cholesterolbenzoate [21, 22] - together with the acetate the foundation stones of liquid crystal history [21, 22] Kelker s MBBA -first liquid crystal fluid at ambient temperature [ 13 f, g] Gray s cyanobiphenyl nematics for electrooptic displays [25 a, 51 e] lyotropic lecithin membrane component [7 a, 14, 27 d, 52 a] and valinomycin-K -membrane carrier [7 a, 35] thermotropic cholesteryl-side-chain-modifiedpolysiloxanes with the combination of flexible main-chain and side-chain spacers [51 a, h] thermotropic azoxybenzene polymers with flexible main-chain spacers [51a] thermotropic cya-...

A. R. Kmetz, Matrix addressing of non-emissive displays, in Nonemissive electrooptical displays, ed. 

As well as providing the basis for electrooptic displays, the Frdedericksz transitions... 

A.R. Kmetz, Matrix addressing of non-emissive display, in Nonemissive Electrooptic Display, ed. by A.R. Kmetz, F.K. von Willisen (Plenum, 1976)... 

In addition, it has been demonstrated that such molecularly designed polymers with narrow polydispersities can be used for further functionalization or crosslinking reactions and exploited for fabricating optical data storage, electrooptic displays and nonlinear optical systems (Percec and Tomazos 1992). 

Industrial Applications Characterizing inverted micelles electrooptical displays electronic systems for optical information processing (organic photoconductors) " Langmuir-Blodgett films self-assembled monolayer films nano-stmctured silica films vacuum-deposited films Safety/Toxicity No data available... 

Hirai, Y. Haruta, M. Nishimura, Y Matsuda, H. Nakagiri, T. Electrooptical displays containing organic unimolecular films. Jpn. Kokai Tokkyo Kobo JP 60241273,1985. 

---