Title: Displays

Abstract: A liquid crystal analogue display device has a pair of electrodes between which a nematic liquid crystal material is disposed, so that the liquid crystal is switched from a homogeneous to a homeotropic state when the voltage between the electrodes exceeds a given threshold. A potential gradient is established along one of the electrodes, and a variable potential, within this gradient, is applied to the other electrode, for example from a fuel tank contents gauge. The position at which a low voltage or null, below the threshold switching potential, is established between the two electrodes will be dependent upon the magnitude of the variable voltage, so that by suitable illumination of the cell a movable display such as a line is obtained which is a direct analogue of the quantity represented by the variable voltage.

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Inventors: Moore, William Thomas (London, EN)

Application Number: 551420
Filing Date: 1975-02-20
Publication_date: 1976-09-07
Assignee: The Rank Organisation Limited (London, EN)
Primary Class(es): 345/87 180/219, 324/96, 349/35
Other Classes:
US Patent Ref:

3667039	May, 1972	Garfein et al.	340/324.
3727527	Apr, 1973	Borowski et al.	350/160.
3774195	Nov, 1973	Schulthess et al.	340/324.
3820875	Jun, 1974	Bohmer	350/160.
3834794	Sep, 1974	Soref	350/160.
3846775	Nov, 1974	Epstein	350/160.
3857628	Dec, 1974	Strong	350/160.
3869196	Mar, 1975	Kubota	350/160.

Other Refs:
Primary Examiner: Trafton, David L.
Assistant Examiner:
Attorney: Brisebois & Kruger