Color, reflective liquid crystal displays

• US 5,493,430 A
• Filed: 08/03/1994
• Issued: 02/20/1996
• Est. Priority Date: 08/03/1994
• Status: Expired due to Term

• Current Assignee: Kent Displays Incorporated
• Original Assignee: Kent Display Systems Incorporated
• Inventors: Yaniv, Zvi, Lu, Minhua, Yuan, Haiji
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Dudek, James A.
• Application Number:
  US08/285,305
• Time in Patent Office: 566 Days
• Field of Search: 359/68, 359/65, 359/105, 359/67
• US Class Current: 349/106
• CPC Class Codes: G02F 1/13718 based on a change of the texture state of a cholesteric liquid crystal
• CPC Class Codes: G02F 2203/02 reflective

Abstract

A display device (10) having first and second substrates (12) and (30) and a layer of a liquid crystal material having a periodic modulated structure, such as a PSCT or PFCT liquid crystal material disposed therebetween. A layer of a color imparting material (18) is disposed atop one surface of one substrate. The liquid crystal material is tailored or tuned to complementarily provide color to said display in connection with said layer of color imparting material.

Claims

1. A full color liquid crystal display having a viewer proximal and a viewer distal side, said display comprising:

a first substrate having a first and second major surface, and having a color imparting layer disposed on one major surface thereof, and said second major surface defining said viewer distal side of said display;

a second substrate disposed opposite said first substrate; and

a layer of a liquid crystal material having periodic modulated optical structure that reflects light, disposed between said first and second substrates, said material having a first state in which said material is substantially transparent, and a second state which reflects light of a preselected wavelength, said preselected wavelength selected to complement the color imparted by said color imparting layer.

2. A display as in claim 1, wherein said liquid crystal material is a cholesteric texture liquid crystal material.

3. A display as in claim 2, wherein said liquid crystal material is polymer stabilized cholesteric texture liquid crystal material.

4. A display as in claim 2, wherein said liquid crystal material is polymer free cholesteric texture liquid crystal material.

5. A display as in claim 1, wherein said first and second substrates further include a layer of a transparent electrically conductive material.

6. A display as in claim 1, wherein said color imparting layer provides a plurality of colors.

7. A display as in claim 6, wherein said plurality of colors are arranged in a plurality of patterns.

8. A display as in claim 6, wherein said plurality of colors are arranged in a plurality of rows.

9. A display as in claim 6, wherein said plurality of colors are arranged in a plurality of rows and columns.

10. A display as in claim 1 wherein said color imparting layer is a colored paint.

11. A display as in claim 1 wherein said color imparting layer is a color reflector.

12. A display as in claim 1 wherein said color imparting layer is color dye.

13. A display as in claim 1 wherein said color imparting layer is an intrinsic color dielectric substrate.

14. A display as in claim 1 wherein said color imparting layer is a dynamic color imparting layer.

15. A display as in claim 1 wherein said color imparting layer is a dynamic color imparting layer.

16. A display as in claim 15, wherein said dynamic color imparting layer may be fabricated from an electrochromic device, an electrophoretic device, a photochromic device, a piezochromic device, a thermochromic device, and combinations thereof.

17. A display as in claim 1 wherein said color imparting layer is a light emitting material.

18. A display as in claim 1, further including a retroreflector disposed adjacent said first substrate.