Passive matrix SSFLC display with analogue grey levels using PTFE alignment films

Campoli, F.; Beccherelli, Romeo; d’Alessandro, Antonio; Ferrara, Vincenzo; Maltese, Paolo

doi:10.1016/s0141-9382(99)00020-7

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Characterisation Of Photoalignment Materials For Photonic Ap1

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2005

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Cited by 3 publications

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“…Moreover unwanted electrostatic charges are produced as a side effect of the rubbing action on the dielectric film. Effects of contamination introduced by the velvet cloth could be reduced by depositing PTFE [5,6] by hot friction directly from a PTFE roll. Particles generated by the rubbing process are a general problem in the manufacturing of structures on the micrometer scale.…”

Section: Characterisation Of Photoalignment Materials For Photonic Apmentioning

confidence: 99%

Characterisation of Photoalignment Materials for Photonic Applications at Visible and Infrared Wavelengths

Beccherelli

Manolis

d’Alessandro

2005

Molecular Crystals and Liquid Crystals

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Section: Characterisation Of Photoalignment Materials For Photonic Apmentioning

confidence: 99%

Characterisation of Photoalignment Materials for Photonic Applications at Visible and Infrared Wavelengths

Beccherelli

Manolis

d’Alessandro

2005

Molecular Crystals and Liquid Crystals

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Versatile driving system for non-root-mean-square responding liquid crystal displays

Beccherelli

Giacomo

Martino

et al. 2003

IEE Proc., Circuits Devices Syst.

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PTFE alignment for rapid prototyping of LCDs

Lester

Coles

2002

XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications

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Films of Poly-Tetra-Fluoro-Ethylene (PTFE) have been shown to be very effective alignment agents for liquid crystal materials. Such films may be deposited in a one step dry process offering advantages in terms of both time and simplicity over deposition of polyimide or Si02 aligmnent layers. This is most appropriate for applications where a test device is required as part of a rapid prototype for ergonomic and similar testing. Earlier work has identified suitable deposition parameters (temperature, surface pressure, velocity) for production of PTFE films but with single films there is still typically some variation in the alignment due to the machined surface of the PTFE bar itself. In this work multiple film deposition using a 'step and repeat' has been investigated as a means ofachieving improved alignment uniformity and has been found effective in test devices of several cm2. Electro-Optic measurements on a multiple pixel test device show little spatial variation in the threshold voltage illustrating the possibility of matrix addressing a PTFE aligned prototype device.In conclusion PTFE films offer a very rapid method of producing alignment layers for devices having reproducible and uniform electro-optic characteristics.

show abstract

Passive matrix SSFLC display with analogue grey levels using PTFE alignment films

Cited by 3 publications

References 13 publications

Characterisation of Photoalignment Materials for Photonic Applications at Visible and Infrared Wavelengths

Characterisation of Photoalignment Materials for Photonic Applications at Visible and Infrared Wavelengths

Versatile driving system for non-root-mean-square responding liquid crystal displays

PTFE alignment for rapid prototyping of LCDs

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