SWITCHABLE TRANSPARENT DISPLAY

• US 20140132909A1
• Filed: 11/13/2012
• Published: 05/15/2014
• Est. Priority Date: 11/13/2012
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: WHEATLEY, JOHN A., CASNER, GLENN E., WARDHANA, JANE K., HITE, AMY J., ROBERTS, RALPH R., PELLERITE, MARK J., SANFORD, QUINN D., WEBER, BRIAN T.
• Application Number:
  US13/675,121
• Publication Number:
  US 20140132909A1
• Time in Patent Office: Days
• US Class Current: 349/155
• CPC Class Codes: G02F 1/1334 based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/13392 spacers dispersed on the cell substrate, e.g. spherical particles, microfibres
• CPC Class Codes: G02F 1/134327 Segmented, e.g. alpha numeric display
• CPC Class Codes: G02F 1/13476 in which at least one liquid crystal cell or layer assumes a scattering state
• CPC Class Codes: G03B 21/56 Projection screens
• CPC Class Codes: Y10T 156/1064 Partial cutting [e.g., grooving or incising]

Abstract

A transparent display is disclosed that includes a display screen. The display screen includes a first film that includes a first transparent conductor disposed upon a first transparent substrate and a second film that includes a second transparent conductor disposed upon a second transparent substrate. A first polymeric liquid crystal composition containing spacer beads is disposed between the first film and the second film. At least one of the first transparent conductor and the second transparent conductor is shaped, or at least one of the first transparent conductor and the second transparent conductor is patterned. Also, disclosed is a display system that includes the disclosed display screen and an illumination device for projecting light onto or through the display screen. Finally, a method of constructing a display screen is also disclosed.

Claims

1. A display screen comprising:

a first film comprising a first transparent conductor disposed upon a first transparent substrate; and

a second film comprising a second transparent conductor disposed upon a second transparent substrate,

wherein a first polymeric liquid crystal composition comprising first spacer beads is disposed between and in contact with the first film and the second film,

wherein at least one of the first transparent conductor and the second transparent conductor is shaped, or

wherein at least one of the first transparent conductor and the second transparent conductor is patterned.

2. A display screen according to claim 1, wherein the first transparent conductor comprises two or more electrically-isolated sections.

3. A display screen according to claim 2, wherein the electrically-isolated sections comprise a plurality of electrical leads, each electrical lead in electrical communication with one of the electrically-isolated regions.

4. A display screen according to claim 1, wherein the transparent conductor comprises indium-tin oxide, antimony-tin oxide, fluorine doped tin oxide, doped zinc oxide, graphene, polyacetylenes, polyanilines, polypyrroles, polythiophenes, poly(3,4-ethylenedioxythiphene) [PEDOT]:

poly(styrene sulfonate) PSS, nanowires, or doped poly(4,4-dioctylcyclopentadithiophene).

5. A display screen according to claim 4, wherein the transparent conductor comprises indium tin oxide.

6. A display screen according to claim 1, wherein the polymeric liquid crystal composition comprises a polymer-dispersed liquid crystal system or a polymer-stabilized liquid crystal system.

7. A display screen according to claim 1, further comprising a third film comprising a third transparent conductor,

wherein the third film comprises a third transparent conductor comprising a second polymeric liquid crystal composition that includes second spacer beads disposed between and in contact with the second film and the third film.

8. A display screen according to claim 7, wherein the second film comprises a fourth transparent conductor disposed upon the opposite side of the second film from the second transparent conductor.

9. A display screen according to claim 1, wherein the first transparent conductor is shaped and patterned.

10. A display screen according to claim 9, wherein the first transparent conductor has electrically-isolated sections that are in the form of an addressable array.

11. A display screen according to claim 1, wherein each electrically-isolated section of the first transparent conductor is switchable from a diffuse state to a transparent state.

26. The display screen according to claim 6, wherein the polymeric liquid crystal composition further comprises a dichroic dye.

12. A display system comprising:

an illumination device for projecting light onto or through a switchable display screen,

the display screen comprising;

a first film comprising a first transparent conductor disposed upon a first transparent substrate; and

a second film comprising a second transparent conductor disposed upon a second transparent substrate,

wherein a first polymeric liquid crystal composition comprising first spacer beads is disposed between and in contact with the first film and the second film, and

wherein at least one of the first transparent conductor and the second transparent conductor is shaped, or

wherein at least one of the first transparent conductor and the second transparent conductor is patterned.

13. A display system according to claim 12, wherein at least one of the first transparent conductor or the second transparent conductor comprises two or more electrically-isolated sections.

14. A display system according to claim 13, wherein the electrically-isolated sections of the first transparent conductor or the second transparent conductor comprise a plurality of electrical leads, each electrical lead in electrical communication with one of the electrically-isolated sections.

15. A display system according to claim 12, wherein the polymeric liquid crystal composition comprises a polymer-dispersed liquid crystal system or a polymer-stabilized liquid crystal system.

16. A display system according to claim 12, further comprising a third film comprising a third transparent conductor,

wherein the second film comprises a third transparent conductor comprising a second polymeric liquid crystal composition that includes second spacer beads disposed between and in contact with the second film and the third film.

17. A display system according to claim 16, wherein the second film comprises a fourth transparent conductor disposed upon the opposite side of the second film from the second transparent conductor.

18. A display system according to claim 13, further comprising a mask for projecting light having shaped content.

19. A display system according to claim 18, wherein the mask comprises a virtual mask.

20. A display system according to claim 13, wherein each shaped electrically-isolated section of the first transparent conductor is switchable from a transparent state to a diffuse state.

21. A display system according to claim 19, wherein the shaped content of the projected light is synchronized with the shape of the diffuse state of at least one electrically-isolated section of the first transparent conductor.

22. A display system according to claim 19, wherein the shaped content of the projected light substantially matches the shape of the at least one or more shaped electrically-isolated section of the first transparent conductor that is in a diffuse state.

23. A display system according to claim 22, wherein when the shaped content of the projected light changes, the shape of at least one or more electrically-isolated sections of the first transparent conductor changes from a transparent state to a diffuse state or from a diffuse state to a transparent state in synchronization.

24. A method of constructing a display screen comprising:

etching a pattern into a transparent conductive electrode having one edge, wherein the transparent conductive electrode is disposed upon a substrate to produce a patterned transparent conductive electrode;

affixing the edge of the patterned transparent conductive electrode to the edge of an unpatterned transparent conductive electrode;

applying a bead of a curable solution comprising a polymeric liquid crystal composition and spacer beads between the patterned transparent conductive electrode and the unpatterned transparent conductive electrode;

laminating the patterned transparent conductive electrode to the unpatterned transparent conductive electrode thereby spreading the solution substantially evenly between the patterned transparent conductive electrode and the unpatterned transparent conductive electrode; and

curing the curable solution to form a display screen.

25. A method of constructing a display screen according to claim 24, further comprising shaping the display screen.