OPTICAL MEMBER AND OLED DISPLAY DEVICE

• US 20160181573A1
• Filed: 05/26/2015
• Published: 06/23/2016
• Est. Priority Date: 12/23/2014
• Status: Active Grant

• Current Assignee: Tianma Microelectronics Company Limited, Wuhan Tianma Micro-Electronics Company Limited (Wuhan Donghu New Technology Development Zone Production Promotion Centre), Wuhan Tianma Microelectronics Company Limited Shanghai Branch
• Original Assignee: Shanghai Tianma AM-OLED Co. Ltd (Tianma Microelectronics Company Limited), Tianma Microelectronics Company Limited
• Inventors: XIA, Wanwan, HAN, Lijing, LUO, Liyuan
• Granted Patent: US 9,887,391 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 27/0018 with means for preventing ghost images anti-reflection coatings G02B1/11
• CPC Class Codes: G02B 27/281 used for attenuating light intensity, e.g. comprising rotatable polarising elements
• CPC Class Codes: G02B 5/3016 involving passive liquid crystal elements optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528
• CPC Class Codes: G02B 5/3025 Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state G02B5/3008, G02B5/3016 take precedence
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 50/868 Arrangements for polarized light emission H10K50/86 takes precedence
• CPC Class Codes: H10K 59/50 OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements

Abstract

The invention discloses an optical member and an OLED display including an optical member. The optical member includes: a metal electrode, a λ/4 phase-difference plate and a linear polarization plate sequentially arranged in this order. A λ/2 phase-difference plate and a brightness enhancement film are arranged between the λ/4 phase-difference plate and the linear polarization plate; there is an angle between an absorption axis of the linear polarization plate and a polarization axis of the brightness enhancement film; and there is an angle between the polarization axis of the brightness enhancement film and a slow axis of the λ/2 phase-difference plate. This arrangement can address the problem in the related art that faces the difficulty to improve the transmittivity of light in an optical member in an OLED display.

Claims

1. An optical member, comprising:

a metal electrode, a λ

/4 phase-difference plate and a linear polarization plate sequentially arranged in this order;

a λ

/2 phase-difference plate and a brightness enhancement film arranged between the λ

/4 phase-difference plate and the linear polarization plate;

wherein;

there is an angle between an absorption axis of the linear polarization plate and a polarization axis of the brightness enhancement film; and

there is an angle between the polarization axis of the brightness enhancement film and a slow axis of the λ

/2 phase-difference plate.

2. The optical member according to claim 1, wherein the λ

/2 phase-difference plate is arranged between the λ

/4 phase-difference plate and the brightness enhancement film.

3. The optical member according to claim 1, wherein the λ

/2 phase-difference plate is arranged between the brightness enhancement film and the linear polarization plate.

4. The optical member according to claim 1, wherein an OLED light-emitting layer is arranged below the metal electrode.

5. The optical member according to claim 1, wherein the λ

/2 phase-difference plate has an optical absorptivity of 5%, and the λ

/4 phase-difference plate has an optical absorptivity of 2%.

6. The optical member according to claim 1, wherein the brightness enhancement film has an optical absorptivity of 4%, a transmittivity of 48%, and a reflectivity of 48%.

7. The optical member according to claim 1, wherein a surface of the metal electrode has a reflectivity of 40% to 50%.

8. The optical member according to claim 1, wherein an angle between the absorption axis of the linear polarization plate and the slow axis of the λ

/2 phase-difference plate is in a range from 30°

to 45°

.

9. The optical member according to claim 2, wherein an angle between the absorption axis of the linear polarization plate and the slow axis of the λ

/2 phase-difference plate is in a range from 30°

to 45°

.

10. The optical member according to claim 3, wherein an angle between the absorption axis of the linear polarization plate and the slow axis of the λ

/2 phase-difference plate is in a range from 30°

to 45°

.

11. The optical member according to claim 4, wherein an angle between the absorption axis of the linear polarization plate and the slow axis of the λ

/2 phase-difference plate is in a range from 30°

to 45°

.

12. The optical member according to claim 1, wherein the angle between the slow axis of the λ

/2 phase-difference plate and the polarization axis of the brightness enhancement film is in a range from 30°

to 45°

.

13. The optical member according to claim 2, wherein the angle between the slow axis of the λ

/2 phase-difference plate and the polarization axis of the brightness enhancement film is in a range from 30°

to 45°

.

14. The optical member according to claim 3, wherein the angle between the slow axis of the λ

/2 phase-difference plate and the polarization axis of the brightness enhancement film is in a range from 30°

to 45°

.

15. The optical member according to claim 4, wherein the angle between the slow axis of the λ

/2 phase-difference plate and the polarization axis of the brightness enhancement film is in a range from 30°

to 45°

.

16. The optical member according to claim 1, wherein the slow axis of the λ

/2 phase-difference plate is parallel to a slow axis of the λ

/4 phase-difference plate.

17. The optical member according to claim 2, wherein the slow axis of the λ

/2 phase-difference plate is parallel to a slow axis of the λ

/4 phase-difference plate.

18. The optical member according to claim 3, wherein the slow axis of the λ

/2 phase-difference plate is parallel to a slow axis of the λ

/4 phase-difference plate.

19. The optical member according to claim 1, wherein the brightness enhancement film is a dual brightness enhancement film.

20. An OLED display device comprising an optical member, the optical member comprising:

a metal electrode, a λ

/4 phase-difference plate and a linear polarization plate sequentially arranged in this order;

a λ

/2 phase-difference plate and a brightness enhancement film arranged between the λ

/4 phase-difference plate and the linear polarization plate;

wherein;

there is an angle between an absorption axis of the linear polarization plate and a polarization axis of the brightness enhancement film; and

there is an angle between the polarization axis of the brightness enhancement film and a slow axis of the λ

/2 phase-difference plate.