Liquid crystal-type nonglare mirror

• US 4,729,638 A
• Filed: 07/29/1985
• Issued: 03/08/1988
• Est. Priority Date: 08/01/1984
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Shirai, Yoshihiro
• Primary Examiner(s): Arnold, Bruce Y.
• Assistant Examiner(s): Lerner, Martin
• Application Number:
  US06/759,824
• Time in Patent Office: 953 Days
• Field of Search: 350/346, 350/339 R, 350/341, 350/340, 350/347 E, 350/336, 350/347 R
• US Class Current: 349/195
• CPC Class Codes: B60R 1/088 using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
• CPC Class Codes: G02B 5/0858 the reflecting layers comprising a single metallic layer with one or more dielectric layers
• CPC Class Codes: G02B 5/0866 incorporating one or more organic, e.g. polymeric layers
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133565 inside the LC elements, i.e. between the cell substrates
• CPC Class Codes: G02F 1/13725 based on guest-host interaction G02F1/13762, G02F1/13737, take precedence

Abstract

A liquid crystal-type nonglare mirror suitable for room mirrors or for vehicles, which effectively prevents the formation of interference fringes under light sources, such as sodium lamps, halogen lamps and the like. The mirror is composed of a transparent electrode base, a liquid crystal and a reflective electrode base, in which the liquid crystal is placed between the above electrode bases. The technical effects may be provided by the limitation that rubbing directions of both electrodes are nonparallel and that the twist angle of the liquid crystal is about 360°. The technical effects may also be obtained from the insertion of a silicon nitride layer in the construction of the mirror.

Claims

1. A liquid crystal nonglare mirror comprising a guest-host liquid crystal between a transparent electrode base and a reflective electrode base, in which both bases of which rubbing directions are nonparallel are subjected to a treatment for homogeneous alignment and a twist angle of the liquid crystal is about 360°

in order to prevent interference fringes.

2. The mirror of claim 1 in which a front substrate is provided for said transparent electrode, said front substrate having a microscopically rough surface and a bottom substrate is provided for the reflective electrode base, said bottom substrate being generally flat.

3. A liquid crystal nonglare mirror for preventing interference fringes comprising a guest-host liquid crystal between a transparent electrode substrate and a reflective electrode substrate, in which at least one of the transparent electrode base and the reflective electrode base is composed of a transparent electrode, a silicon nitride insulation layer and a polyimide orientation layer in this order.

4. The nonglare mirror of claim 3 in which the front substrate of the transparent electrode base has a microscopically rough surface and the bottom substrate of the reflective electrode base is generally flat.