IP Library › Granted Patent US 7,876,042
Granted Patent B2
US 7,876,042 · App. 12/349,793 · Granted Jan 25, 2011

Double-sided light emitting device

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Quick Facts
Patent No.
US 7,876,042
App. No.
12/349,793
Granted
Jan 25, 2011
Kind
B2
Abstract

A double-sided light emitting device including lower and upper substrates, an emission element formed between an inner surface of the upper substrate and an inner surface of the lower substrate and emitting predetermined light, an upper layer of polarizing material disposed on at least one of inner and outer surfaces of the upper substrate, and a lower layer of polarizing material disposed on at least one of inner and outer surfaces of the lower substrate.

Claims (62)

1. A double-sided light emitting device comprising:

lower and upper substrates;

an emission element formed between an inner surface of the upper substrate and an inner surface of the lower substrate and emitting predetermined light;

an upper polarizing element disposed on any one of inner and outer surfaces of the upper substrate;

a lower polarizing element disposed on any one of inner and outer surfaces of the lower substrate;

an upper compensating plate disposed between the upper polarizing element and the emission element; and

an lower compensating plate disposed between the lower polarizing element and the emission element,

wherein when a phase difference retardation value of each of the compensating plates is denoted by x, the phase difference retardation value, x, satisfies the following expression:

nλ/ 2≦ x ≦( n+ 1)λ/2,

where n is an integer number.

2. The double-sided light emitting device as claimed in claim 1 , wherein a crossing angle between a phase difference retardation axis of the lower compensating plate disposed between the lower polarizing element and the emission element and a polarization axis of the lower polarizing element is opposite to a crossing angle between a phase difference retardation axis of the upper compensating plate disposed between the upper polarizing element and the emission element and a polarization axis of the upper polarizing element.

3. The double-sided light emitting device as claimed in claim 1 , wherein the lower polarizing element is disposed on the outer surface of the lower substrate, and the lower compensating plate is disposed between the lower polarizing element and the outer surface of the lower substrate, and

the upper polarizing element is disposed on the outer surface of the upper substrate, and the upper compensating plate is disposed between the upper polarizing element and the outer surface of the upper substrate.

4. The double-sided light emitting device as claimed in claim 1 , wherein the lower polarizing element is disposed on the outer surface of the lower substrate, and the lower compensating plate is disposed between the lower polarizing element and the outer surface of the lower substrate, and

the upper polarizing element is disposed on the inner surface of the upper substrate, and the upper compensating plate is disposed between the upper polarizing element and the inner surface of the upper substrate.

5. The double-sided light emitting device as claimed in claim 1 , wherein the lower polarizing element is disposed on the inner surface of the lower substrate, and the lower compensating plate is disposed between the lower polarizing element and the inner surface of the lower substrate, and

the upper polarizing element is disposed on the inner surface of the upper substrate, and the upper compensating plate is disposed between the upper polarizing element and the inner surface of the upper substrate.

6. The double-sided light emitting device as claimed in claim 1 , wherein the lower polarizing element is disposed on the inner surface of the lower substrate, and the lower compensating plate is disposed between the lower polarizing element and the inner surface of the lower substrate, and

the upper polarizing element is disposed on the outer surface of the upper substrate, and the upper compensating plate is disposed between the upper polarizing element and the outer surface of the upper substrate.

7. The double-sided light emitting device as claimed in claim 3 , wherein the lower and upper compensating plates include at least one compensating film having a predetermined phase difference retardation axis.

8. The double-sided light emitting device as claimed in claim 1 , wherein, when the lower and upper compensating plates have phase difference retardation axes equal to each other, the lower and upper polarizing elements have polarization axes parallel to each other.

9. The double-sided light emitting device as claimed in claim 1 , wherein, when the lower and upper compensating plates have phase difference retardation axes opposite to each other, the lower and upper polarizing elements have polarization axes perpendicular to each other.

10. A double-sided light emitting device comprising:

lower and upper substrates;

an emission element formed between an inner surface of the upper substrate and an inner surface of the lower substrate and emitting predetermined light;

an upper polarizing element disposed on any one of inner and outer surfaces of the upper substrate;

a lower polarizing element disposed on any one of inner and outer surfaces of the lower substrate; and

a compensating plate disposed at least one of between the upper polarizing element and the emission element and between the lower polarizing element and the emission element,

wherein the emission element emits light toward both the lower and upper substrates.

11. The double-sided light emitting device as claimed in claim 10 , wherein a rotational angle between a lower compensating plate, disposed between the lower polarizing element and the emission element, and the lower polarizing element is opposite to a rotational angle between an upper compensating plate, disposed between the upper polarizing element and the emission element, and the upper polarizing element.

12. The double-sided light emitting device as claimed in claim 10 , wherein a phase difference between a lower compensating plate, disposed between the lower polarizing element and the emission element, and the lower polarizing element, and a phase difference between an upper compensating plate, disposed between the upper polarizing element and the emission element, and the upper polarizing element, are summed to be nλ/2, where n is an integer number except for zero (0).

13. The double-sided light emitting device as claimed in claim 10 , wherein when a phase difference retardation value of each of the compensating plates is denoted by x, the phase difference retardation value, x, satisfies the following expression:

nλ/ 2≦ x ≦( n+ 1)λ/2,

where n is an integer number.

14. The double-sided light emitting device as claimed in claim 10 , wherein the compensating plate includes at least one compensating film.

15. The double-sided light emitting device as claimed in claim 14 , wherein the compensating plate includes a compensating film having a same retardation axis.

16. The double-sided light emitting device as claimed in claim 14 , wherein the compensating plate includes compensating films having a different phase difference retardation axis.

17. The double-sided light emitting device as claimed in claim 10 , wherein the compensating plate includes an upper compensating plate disposed between the upper polarizing element and the emission element.

18. The double-sided light emitting device as claimed in claim 17 , wherein the upper polarizing element is disposed on the inner surface of the upper substrate, and the upper compensating plate is disposed between the upper polarizing element and the inner surface of the upper substrate.

19. The double-sided light emitting device as claimed in claim 17 , wherein the upper polarizing element is disposed on the outer surface of the upper substrate, and the upper compensating plate is disposed between the upper polarizing element and the outer surface of the upper substrate.

20. The double-sided light emitting device as claimed in claim 17 , wherein the upper compensating plate includes at least one compensating film having a predetermined phase difference retardation axis.

21. The double-sided light emitting device as claimed in claim 10 , wherein the compensating plate includes a lower compensating plate disposed between the lower polarizing element and the emission element.

22. The double-sided light emitting device as claimed in claim 21 , wherein the lower polarizing element is disposed on the outer surface of the lower substrate, and the lower compensating plate is disposed between the lower polarizing element and the outer surface of the lower substrate.

23. The double-sided light emitting device as claimed in claim 21 , wherein the lower polarizing element is disposed on the inner surface of the lower substrate, and the lower compensating plate is disposed between the lower polarizing element and the inner surface of the lower substrate.

24. The double-sided light emitting device as claimed in claim 21 , wherein the upper compensating plate includes at least one compensating film having a predetermined phase difference retardation axis.

25. The double-sided light emitting device as claimed in claim 10 , wherein the compensating plate includes:

an upper compensating plate disposed between the upper polarizing element and the emission element; and

a lower compensating plate disposed between the lower polarizing element and the emission element.

26. The double-sided light emitting device as claimed in claim 25 , wherein, when the lower and upper compensating plates have phase difference retardation axes equal to each other, the lower and upper polarizing elements have polarization axes parallel to each other.

27. The double-sided light emitting device as claimed in claim 25 , wherein, when the lower and upper compensating plates have phase difference retardation axes opposite to each other, the lower and upper polarizing elements have polarization axes perpendicular to each other.

28. The double-sided light emitting device as claimed in claim 25 , wherein the lower polarizing element is disposed on the outer surface of the lower substrate, and the lower compensating plate is disposed between the lower polarizing element and the outer surface of the lower substrate, and

the upper polarizing element is disposed on the outer surface of the upper substrate, and the upper compensating plate is disposed between the upper polarizing element and the outer surface of the upper substrate.

29. The double-sided light emitting device as claimed in claim 25 , wherein the lower polarizing element is disposed on the outer surface of the lower substrate, and the lower compensating plate is disposed between the lower polarizing element and the outer surface of the lower substrate, and

the upper polarizing element is disposed on the inner surface of the upper substrate, and the upper compensating plate is disposed between the upper polarizing element and the inner surface of the upper substrate.

30. The double-sided light emitting device as claimed in claim 25 , wherein the lower polarizing element is disposed on the inner surface of the lower substrate, and the lower compensating plate is disposed between the lower polarizing element and the inner surface of the lower substrate, and

the upper polarizing element is disposed on the inner surface of the upper substrate, and the upper compensating plate is disposed between the upper polarizing element and the outer surface of the upper substrate.

31. The double-sided light emitting device as claimed in claim 25 , wherein the lower polarizing element is disposed on the inner surface of the lower substrate, and the lower compensating plate is disposed between the lower polarizing element and the inner surface of the lower substrate, and

the upper polarizing element is disposed on the outer surface of the upper substrate, and the upper compensating plate is disposed between the upper polarizing element and the outer surface of the upper substrate.

32. The double-sided light emitting device as claimed in claim 25 , wherein each of the lower and upper compensating plates includes at least one compensating film having a predetermined phase difference retardation axis.

33. The double-sided light emitting device as claimed in claim 32 , wherein when a phase difference retardation value of each of the lower and upper compensating plates is denoted by x, the phase difference retardation value, x, satisfies the following expression:

nλ/ 2≦ x ≦( n+ 1)λ/2,

where n is an integer number.

Assignments (1)
MERGER Recorded Oct 16, 2012
From: SAMSUNG MOBILE DISPLAY CO., LTD.
To: SAMSUNG DISPLAY CO., LTD.
Reel/Frame 029227/0419 →