Liquid crystal display with polymeric substrate

• US 5,399,390 A
• Filed: 01/27/1994
• Issued: 03/21/1995
• Est. Priority Date: 01/27/1994
• Status: Expired due to Term

• Current Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Akins, Robert B.
• Primary Examiner(s): Thomas, Alexander S.
• Application Number:
  US08/186,952
• Time in Patent Office: 418 Days
• Field of Search: 428/1, 359/82, 359/81, 359/53, 359/101, 359/99, 359/96
• US Class Current: 428/1.62
• CPC Class Codes: C09K 2323/06 Substrate layer characterised by chemical composition
• CPC Class Codes: C09K 2323/061 Inorganic, e.g. ceramic, metallic or glass
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: G02F 1/133377 Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/13473 for wavelength filtering or for colour display without the use of colour mosaic filters

Abstract

A liquid crystal display device (60) having first and second polymeric substrates (30) and (62) and a layer of cholesteric liquid crystal material disposed therebetween. The cholesteric liquid crystal material is disposed in a plurality of channels (36), (38), and (40) formed in one surface (32) of one of said substrates. The liquid crystal material may be further adapted to reflect light of specific wavelengths, so as to affect a color liquid crystal display.

Claims

1. A liquid crystal display device comprising:

a first substrate fabricated of an optically anisotropic polymeric material, said substrate having a layer of transparent conductive material disposed on at least part of one surface thereof;

a second substrate fabricated of an optically anisotropic polymeric material, said second substrate having a plurality of channels formed on one surface thereof, said channels having a layer of transparent conductive material disposed therein, said second substrate being operatively positioned relative to said first substrate so that said channeled surface of said second substrate is in substantially parallel, facing relationship with said coated surface of said first substrate; and

a layer of cholesteric liquid crystal material disposed in each of said channels.

2. A display device as in claim 1, wherein said first and second substrates are bonded to one another.

3. A display device as in claim 2, wherein said substrates are bonded in the regions between said channels.

4. A display device as in claim 1, wherein said substrates are fabricated from an extruded thermoplastic material selected from the group of materials consisting of polyester, polyethyleneterephalate, polyetheretherketone, polyetherimide, polyvinylidene fluoride, and combinations thereof.

5. A display device as in claim 1, wherein said transparent conductive material is a transparent conductive oxide.

6. A display device as in claim 5, wherein said transparent conductive oxide is indium tin oxide.

7. A display device as in claim 1, where said cholesteric liquid crystal material is admixed with other liquid crystal materials so as to reflect different wavelengths of light.

8. A display device as in claim 7, wherein said admixtures of cholesteric liquid crystal material are adapted to reflect red, green, and blue light.

9. A display device as in claim 8, wherein different admixtures of cholesteric liquid crystal material are disposed in each said channel.

10. A liquid crystal display device comprising:

at least two liquid crystal display sub-assemblies, each said subassembly comprising;

a first substrate fabricated of an optically anisotropic polymeric material, said substrate having a layer of transparent conductive material disposed on at least part of one surface thereof;

a second substrate fabricated of an optically anisotropic polymeric material, said second substrate having a plurality of channels formed on one surface thereof, said channels having a layer of transparent conductive material disposed therein, said second substrate being operatively positioned relative to said first substrate so that said channeled surface of said second substrate is in substantially parallel, facing relationship with said coated surface of said first substrate; and

a layer of cholesteric liquid crystal material disposed in each of said channels; and

said at least two subassemblies being arranged in a stacked configuration.

11. A display device as in claim 10, wherein said sub-assemblies are stacked so that the channels of one sub-assembly are parallel to and overlap the channels of said other sub-assembly.

12. A display device as in claim 10, wherein said sub-assemblies are stacked so that the channels of one sub-assembly are stacked orthagonally to the channels of said other sub-assemblies.

13. A display device as in claim 10, wherein each said sub-assembly is adapted to reflect different wavelengths of light.

14. A display device as in claim 13, comprising at least three sub-assemblies, one sub-assembly adapted to reflect red light, one sub-assembly adapted to reflect blue light, and one sub-assembly adapted to reflect green light.