Liquid crystal display device for colored display of information with a selective polarizer

• US 4,025,164 A
• Filed: 02/24/1976
• Issued: 05/24/1977
• Est. Priority Date: 03/17/1975
• Status: Expired due to Term

• Current Assignee: Asulab SA (The Swatch Group AG)
• Original Assignee: BBC Brown Boveri & Company Limited (ABB Limited)
• Inventors: Scheffer, Terry J., Doriguzzi, Rino
• Primary Examiner(s): Bauer, Edward S.
• Application Number:
  US05/660,986
• Time in Patent Office: 455 Days
• Field of Search: 350/148, 350/150, 350/154, 350/160 LC
• US Class Current: 349/97
• CPC Class Codes: C09K 19/0208 Twisted Nematic (T.N.); Super Twisted Nematic (S.T.N.); Optical Mode Interference (O.M.I.)
• CPC Class Codes: C09K 19/60 Pleochroic dyes
• CPC Class Codes: G02F 1/133533 Colour selective polarisers G02F1/1347 takes precedence
• CPC Class Codes: G02F 2203/02 reflective

Abstract

A liquid crystal display device for the colored display of information with a reflector and a twisted nematic liquid crystal cell placed between a linear and a selective polarizer is disclosed. The selective polarizer is disposed in front of the twisted nematic liquid crystal cell and the linear polarizer is disposed between the twisted nematic liquid crystal cell and the reflector.

Claims

1. A liquid crystal display device for the colored display of information with a reflector and a twisted nematic liquid crystal cell placed between a linear polarizer and a selective polarizer wherein the selective polarizer is disposed in front of the twisted nematic liquid crystal cell and the linear polarizer is disposed between the twisted nematic liquid crystal cell and the reflector.

2. A device as in claim 1 wherein the selective polarizer comprises at least two polarizing sheets, the preferred directions of which are turned at most 90°

to one another and each of which contains an embedded dichroic dye.

3. A device as in claim 2 wherein the dichroic dye is at least one of the following listed dyes:

Blue dyes;

benzo azurine G, direct brilliant blue C, trypan blue, Chicago blue RW, chlorantine deep blue 4 GL, Sirius super blue BL, Sirius super blue GL, solophenyl blue FGL, solophenyl brilliant blue BL, benzo copper deep blue F3GL, cuprophenyl blue GL, solophenyl marine blue ABL, benzo copper deep violet F3BL, indigo carmine, Levano light cyanine 5RN, Janus green B, renol black;

Red dyes;

Congo red, benzamine rubin FDG, Procion brilliant red M-2B, Maxilon brilliant red 4G, Biebrich scarlet;

Green dyes;

benzo brilliant green L3G, dianil green B, chlorantine deep green BLL, Sirius super green BB, Sirius super green BTL, azo dark green;

Yellow dyes;

benzo copper deep yellow GRL, durazol flavine F, diazol light yellow RS, solophenyl yellow A3GL, solophenyl yellow ARL, Maxilon yellow 3 GL, anthracene yellow C, solochrome orange GRS, Procion yellow M-4R;

Orange dyes;

stilbene orange, Sirius orange G, cuprophenyl orange 3GL, benzo rubin R, benzo copper deep red GGL, benzo orange brown GR, methyl orange;

Violet dyes;

trisulphon violet 2B, Congo violet;

Brown dye;

benzo deep brown NZ;

Black dye;

cuprophenyl gray GRL.

4. A device as in claim 3 wherein the polarizing sheet are of a polymer material, preferably polyvinyl alcohol which exhibits a preferred direction induced by stretching.

5. A device as in claim 1 wherein the selective polarizer has one polarizing sheet in which are embedded at least two different dyes, of which at least one is dichroic.

6. A device as in claim 5 wherein the dichroic dye is at least one of the following listed dyes:

Blue dyes;

benzo azurine G, direct brilliant blue C, trypan blue, Chicago blue RW, chlorantine deep blue 4 GL, Sirius super blue BL, Sirius super blue GL, solophenyl blue FGL, solophenyl brilliant blue BL, benzo copper deep blue F3GL, cuprophenyl blue GL, solophenyl marine blue ABL, benzo copper deep violet F3BL, indigo carmine, Levano light cyanine 5 RN, Janus green B, renol black;

Red dyes;

Congo red, benzamine rubin RDG, Procion billiant red M-2B, Maxilon brilliant red 4G, Biebrich scarlet;

Green dyes;

benzo brilliant green L3G, dianil green B, chlorantine deep green BLL, Sirius super green BB, Sirius super green BTL, azo dark green;

Yellow dyes;

benzo copper deep yellow GRL, durazol flavine F, diazol light yellow RS, solophenyl yellow A3GL, solophenyl yellow ARL, Maxilon yellow 3 GL, anthracene yellow C, solochrome orange GRS, Procion yellow M-4R;

Orange dyes;

stilbene orange, Sirius orange G, cuprophenyl orange 3GL, benzo rubin R, benzo copper deep red GGL, benzo orange brown GR, methyl orange;

Violet dyes;

trisulphon violet 2B, Congo violet;

Brown dye;

benzo deep brown NZ;

Black dye;

cuprophenyl gray GRL.

7. A device as in claim 6 wherein the polarizing sheets are of a polymer material, preferably polyvinyl alcohol which exhibits a preferred direction induced by stretching.

8. A device as in claim 1 wherein the selective polarizer has a polarizing sheet in which a dichroic dye is embedded.

9. A device as in claim 8 wherein the dichroic dye is at least one of the following listed dyes:

Blue dyes;

benzo azurine G, brilliant blue C, trypan blue, Chicago blue RW, chlorantine deep blue 4 GL, Sirius super blue BL, Sirius super blue GL, solophenyl blue FGL, solophenyl brilliant blue BL, benzo copper deep blue F3GL, cuprophenyl blue GL, solophenyl marine blue ABL, benzo copper deep violet F3BL, indigo carmine, Levano light cyanine 5 RN, Janus green B, renol black;

Red dyes;

Congo red, benzamine rubin RDG, Procion brilliant red M-2B, Maxilon brilliant red 4G, Biebrich scarlet;

Green dyes;

benzo brilliant green L3G, dianil green B, chlorantine deep green BLL, Sirius super green BB, Sirius super Green BTL, azo dark green;

Yellow dyes;

benzo copper deep yellow GRL, durazol flavine F, diazol light yellow RS, solophenyl yellow A3GL, solophenyl yellow ARL, Maxilon yellow 3 GL, anthracene yellow C, solochrome orange GRS, Procion yellow M-4R;

Orange dyes;

stilbene orange, Sirous orange G, cuprophenyl orange 3GL, benzo rubin R, benzo copper deep red GGL, benzo orange brown GR, methyl orange;

Violet dyes;

trisulphon violet 2B, Congo violet;

Brown dye;

benzo deep brown NZ;

Black dye;

cuprophenyl gray GRL.

10. A device as in claim 9 wherein the polarizing sheets are of a polymer material, preferably polyvinyl alcohol which exhibits a preferred direction induced by stretching.

11. A device as in claim 1 wherein the dichroic dye is at least one of the following listed dyes:

Blue dyes;

benzo azurine G, direct brilliant blue C, trypan blue, Chicago blue RW, chlorantine deep blue 4 GL, Sirius super blue BL, Sirius super blue GL, solophenyl blue FGL, solophenyl brilliant blue BL, benzo copper deep blue F3GL, cuprophenyl blue GL, solophenyl marine blue ABL, benzo copper deep violet F3BL, indigo carmine, Levano light cyanine 5RN, Janus green B, renol black;

Red dyes;

Congo red, benzamine rubin FDG, Procion brilliant red M-2B, Maxilon brilliant red 4G, Biebrich scarlet;

Green dyes;

benzo brilliant green L3G, dianil green B, chlorantine deep green BLL, Sirius super green BB, Sirius super green BTL, azo dark green;

Yellow dyes;

benzo copper deep yellow GRL, durazol flavine R, diazol light yellow RS, solophenyl yellow A3GL, solophenyl yellow ARL, Maxilon yellow 3 GL, anthracene yellow C, solochrome orange GRS, Procion yellow M-4R;

Orange dyes;

stilbene orange, Sirius orange G, cuprophenyl orange 3GL, benzo rubin R, benzo copper deep red GGL, benzo orange brown GR, methyl orange;

Violet dyes;

trisulphon violet 2B, Congo violet;

Brown dye;

benzo deep brown NZ;

Black dye;

cuprophenyl gray GRL.

12. A device as in claim 11 wherein the polarizing sheets are of a polymer material, preferably polyvinyl alcohol which exhibits a preferred direction induced by stretching.

13. A method of producing a liquid crystal display device for the colored display of information with a reflector and a twisted nematic liquid crystal cell placed between a linear polarizer and a selective polarizer wherein the selective polarizer is disposed in front of the twisted nematic liquid crystal cell and the linear polarizer is disposed between the twisted nematic liquid crystal cell and the reflector comprising:

making a polarizing sheet of the selective polarizer by stretching a polyvinyl alcohol film in a cold water bath,

embedding dichroic molecules in the polyvinyl alcohol film in a dye bath, and,

drying the dichroic molecule embedded polyvinyl alcohol film.

14. A method as in claim 13 further comprising

stretching the polyvinyl alcohol film up to seven times its original length over a period of about three hours in a device disposed in a cold water bath,

immersing the device holding the film for up to five minutes in at least one dye bath with up to one weight percent of dichroic dye,

rinsing the stretched film with distilled solvent, and

drying the film in air.