Emissive display with hybrid polarizer

• US 9,761,843 B2
• Filed: 11/21/2013
• Issued: 09/12/2017
• Est. Priority Date: 11/30/2012
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Haag, Adam D., Arefe, Ghidewon, Epstein, Kenneth A., Naismith, Nathaniel K., Lee, Seong Taek, Lamansky, Sergey, Tolbert, William A.
• Primary Examiner(s): Lee, Kyoung
• Assistant Examiner(s): Mehta, Ratisha
• Application Number:
  US14/648,518
• Publication Number:
  US 20150325813A1
• Time in Patent Office: 1,391 Days
• CPC Class Codes: G02B 27/281 used for attenuating light intensity, e.g. comprising rotatable polarising elements
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/877 comprising scattering means
• CPC Class Codes: H10K 59/878 comprising reflective means
• CPC Class Codes: H10K 59/879 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light

Abstract

An emissive display comprising an OLED, a first birefringent reflective polarizer, a second birefringent reflective polarizer optically between the OLED and the first birefringent reflective polarizer, a first linear absorbing polarizer having a contrast ratio of less than 100:1 optically between the first birefringent reflective polarizer and the second birefringent reflective polarizer, a second linear absorbing polarizer having a contrast ratio of less than 100:1, where the first birefringent reflective polarizer is optically between the second linear absorbing polarizer and the first linear absorbing polarizer, and a structured optical film optically between the OLED and the second birefringent reflective polarizer.

Claims

1. An emissive display comprising:

an OLED;

a first birefringent reflective polarizer;

a second birefringent reflective polarizer optically between the OLED and the first birefringent reflective polarizer;

a first linear absorbing polarizer having a contrast ratio of less than 100;

1 optically between the first birefringent reflective polarizer and the second birefringent reflective polarizer;

a second linear absorbing polarizer having a contrast ratio of less than 100;

1, where the first birefringent reflective polarizer is optically between the second linear absorbing polarizer and the first linear absorbing polarizer; and

a structured optical film optically between the OLED and the second birefringent reflective polarizer.

2. The emissive display of claim 1, wherein the first linear absorbing polarizer has a contrast ratio of less than 10:

1 and the second linear absorbing polarizer has a contrast ratio of less than 10;

1.

3. The emissive display of claim 1, wherein a pass axis of each of the first birefringent reflective polarizer, second birefringent reflective polarizer, first linear absorbing polarizer and second linear absorbing polarizer are substantially aligned.

4. The emissive display of claim 1, wherein the structured optical film comprises nanostructures.

5. The emissive display of claim 4, wherein the structured optical film comprises one dimensional nanostructures.

6. The emissive display of claim 4, wherein the structured optical film comprises two dimensional nanostructures.

7. The emissive display of claim 1, further comprising a quarter wave element optically between the structured optical film and the second birefringent reflective polarizer.

8. The emissive display of claim 1, wherein the first birefringent reflective polarizer, second birefringent reflective polarizer, first linear absorbing polarizer, second linear absorbing polarizer and structured optical film form a composite film.

9. The emissive display of claim 7, wherein the first birefringent reflective polarizer, second birefringent reflective polarizer, first linear absorbing polarizer, second linear absorbing polarizer and quarter wave element form a composite film.

10. The emissive display of claim 7, wherein the first birefringent reflective polarizer, second birefringent reflective polarizer, first linear absorbing polarizer, second linear absorbing polarizer, quarter wave element and structured optical film form a composite film.

11. An emissive display comprising:

an OLED;

a first birefringent reflective polarizer;

a second birefringent reflective polarizer optically between the OLED and the first birefringent reflective polarizer;

a first linear absorbing polarizer having a contrast ratio of less than 10;

1 optically between the first birefringent reflective polarizer and the second birefringent reflective polarizer;

a second linear absorbing polarizer having a contrast ratio of less than 10;

1, where the first birefringent reflective polarizer is optically between the second linear absorbing polarizer and the first linear absorbing polarizer;

a structured optical film optically between the OLED and the second birefringent reflective polarizer; and

a quarter wave element optically between the structured optical film and the second birefringent reflective polarizer.

12. The emissive display of claim 11, wherein a pass axis of each of the first birefringent reflective polarizer, second birefringent reflective polarizer, first linear absorbing polarizer and second linear absorbing polarizer are substantially aligned.

13. The emissive display of claim 11, wherein the first birefringent reflective polarizer, second birefringent reflective polarizer, first linear absorbing polarizer, second linear absorbing polarizer and quarter wave element form a composite film.

14. The emissive display of claim 11, wherein the first birefringent reflective polarizer, second birefringent reflective polarizer, first linear absorbing polarizer, second linear absorbing polarizer, quarter wave element and structured optical film form a composite film.

15. The emissive display of claim 11, wherein the structured optical film comprises nanostructures.

16. The emissive display of claim 15, wherein the structured optical film comprises one dimensional nanostructures.

17. The emissive display of claim 15, wherein the structured optical film comprises two dimensional nanostructures.

18. An emissive display comprising:

an OLED;

a first birefringent reflective polarizer;

a second birefringent reflective polarizer optically between the OLED and the first birefringent reflective polarizer;

a first linear absorbing polarizer having a contrast ratio of less than 100;

1 optically between the first birefringent reflective polarizer and the second birefringent reflective polarizer;

a second linear absorbing polarizer having a contrast ratio of less than 100;

1, wherein the first birefringent reflective polarizer is optically between the second linear absorbing polarizer and the first linear absorbing polarizer; and

a non-polarization preserving element optically between the OLED and the second birefringent reflective polarizer.

19. The emissive display of claim 18, wherein the first linear absorbing polarizer has a contrast ratio of less than 10:

1 and the second linear absorbing polarizer has a contrast ratio of less than 10;

1.

20. The emissive display of claim 18, wherein a pass axis of each of the first birefringent reflective polarizer, second birefringent reflective polarizer, first linear absorbing polarizer and second linear absorbing polarizer are substantially aligned.