Multi-colored liquid crystal display device

• US 4,448,823 A
• Filed: 09/29/1982
• Issued: 05/15/1984
• Est. Priority Date: 09/29/1982
• Status: Expired due to Fees

• Current Assignee: Brad W. Clifford
• Original Assignee: Brad W. Clifford
• Inventors: Clifford, Brad W.
• Primary Examiner(s): MCCAMISH, MARION E
• Application Number:
  US06/427,233
• Time in Patent Office: 594 Days
• Field of Search: 428/1, 350/335, 350/337, 350/341
• US Class Current: 428/1.31
• CPC Class Codes: C09K 2323/031 Polarizer or dye
• CPC Class Codes: G02F 1/13473 for wavelength filtering or for colour display without the use of colour mosaic filters
• CPC Class Codes: G02F 1/13475 in which at least one liquid crystal cell or layer is doped with a pleochroic dye, e.g. GH-LC cell G02F1/13476 takes precedence

Abstract

A multi-colored liquid crystal display device for selectively providing different colored segment displays against a contrasting background. The device includes layered color units. Each color unit includes either a standard liquid crystal display unit and a colored polarized filter, or a dichroic liquid crystal display unit.

Claims

1. A multi-colored liquid crystal display device comprising at least three color units, said color units comprising:

(a) first liquid crystal display and filter means comprising a first liquid crystal display unit operably connected to a first colored filter for providing a first color unit;

(b) second liquid crystal display and filter means comprising a second liquid crystal display unit operably connected to a second colored filter for providing a second color unit; and

(c) third liquid crystal display and filter means comprising a third liquid crystal display unit operably connected to a third color filter for providing a third color unit and being disposed between said first and second liquid crystal display and filter means;

said color units being operably disposed proximal to one another and aligned with one another such that at least some of any light that passes through one of said color units will also pass through all remaining said color units;

whereby different colored displays may be selectively displayed by selectively energizing one or more of said first, second and third liquid crystal display units.

2. The device of claim 1 and further including a reflective surface disposed proximal said second color unit such that at least some of any light that passes through said first colored filter and said first liquid crystal display and filter means and through said second and third color units will be reflected back through said third, second and first color unit.

3. The device of claim 1 and further including a transflective surface disposed proximal said second color unit such that at least some of any light that passes through said first, second and third color unit will be reflected back through said third, second and first color unit, and such that at least some of any light that enters said third color unit through said transflective surface will also pass through said second and first color units.

4. The device of claim 1 wherein said first, second and third colored filters are polarized.

5. The device of claim 1 or claim 5 wherein said first, second and third colored filters are each of a color different from the other two filters.

6. The device of claim 1 wherein each said color unit is formed of a dichroic liquid crystal display unit, whereby different colored displays may be selectively displayed by selectively energizing one or more of said dichroic liquid crystal display units.

7. The device of claim 1 wherein at least one of said color units is comprised of a dichroic liquid crystal display unit, and at least one of said color units is comprised of a combined non-dichroic liquid crystal display unit and filter unit.