Atomic-beam alignment of inorganic materials for liquid-crystal displays

P. Chaudhari, James Lacey, James Doyle, Eileen Galligan, Shui Chi Alan Lien, Alesandro Callegari, Gareth Hougham, Norton D. Lang, Paul S. Andry, Richard John, Kei Hsuing Yang, Minhua Lu, Chen Cai, James Speidell, Sampath Purushothaman, John Ritsko, Mahesh Samant, Joachim Stöhr, Yoshiki Nakagawa, Yoshimine KatohYukito Saitoh, Kazumi Sakai, Hiroyuki Satoh, Shuichi Odahara, Hiroki Nakano, Johji Nakagaki, Yasuhiko Shiota

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Abstract

The technique used to align liquid crystals - rubbing the surface of a substrate on which a liquid crystal is subsequently deposited - has been perfected by the multibillion-dollar liquid-crystal display industry. However, it is widely recognized that a non-contact alignment technique would be highly desirable for future generations of large, high-resolution liquid-crystal displays. A number of alternative alignment techniques have been reported, but none of these have so far been implemented in large-scale manufacturing. Here, we report a non-contact alignment process, which uses low-energy ion beams impinging at a glancing angle on amorphous inorganic films, such as diamond-like carbon. Using this approach, we have produced both laptop and desktop displays in pilot-line manufacturing, and found that displays of higher quality and reliability could be made at a lower cost than the rubbing technique. The mechanism of alignment is explained by adopting a random network model of atomic arrangement in the inorganic films. Order is induced by exposure to an ion beam because unfavourably oriented rings of atoms are selectively destroyed. The planes of the remaining rings are predominantly parallel to the direction of the ion beam.

Original languageEnglish
Pages (from-to)56-59
Number of pages4
JournalNature
Volume411
Issue number6833
DOIs
Publication statusPublished - May 3 2001
Externally publishedYes

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Cite this

Chaudhari, P., Lacey, J., Doyle, J., Galligan, E., Lien, S. C. A., Callegari, A., ... Shiota, Y. (2001). Atomic-beam alignment of inorganic materials for liquid-crystal displays. Nature, 411(6833), 56-59. https://doi.org/10.1038/35075021