Title: Liquid crystal display device

Abstract: A liquid crystal display device, especially, for use in a liquid crystal display watch is disclosed, which is provided with a liquid crystal display element and a reflector comprising a luminescent phosphor, and only in a limited partial area of the reflector corresponding to a specified display portion which should be visible in the dark or at night in the whole time display area of the liquid crystal display element, the luminescent phosphor includes a radioactive nuclide such as promethium (.sup.147 Pm) or tritium (.sup.3 H).

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Inventors: Takami, Katsumi (Tokyo, JP)

Application Number: 903162
Filing Date: 1978-05-05
Publication_date: 1980-06-03
Assignee: Hitachi, Ltd. (Tokyo, JP)
Primary Class(es): 368/84 349/71, 368/226, 368/242, 968/932, 968/DIG1
Other Classes:
US Patent Ref:

3841083	Oct, 1974	Bercet	58/50.
3950078	Apr, 1976	Zatsky	350/345.
4042294	Aug, 1977	Billing, Jr. et al.	350/345.
4126384	Nov, 1978	Goodman et al.	340/345.

Other Refs:
Primary Examiner: Miska, Vit W.
Assistant Examiner:
Attorney: Craig & Antonelli