OLED DISPLAY STRUCTURE AND OLED DISPLAY DEVICE

• US 20140203248A1
• Filed: 01/25/2013
• Published: 07/24/2014
• Est. Priority Date: 05/10/2012
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Zhou, Xiaodong, You, Jaegeon
• Granted Patent: US 9,437,841 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: G02B 27/283 used for beam splitting or combining
• 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 50/00 Organic light-emitting devices integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36
• 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 50/868 Arrangements for polarized light emission H10K50/86 takes precedence
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• 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
• CPC Class Codes: H10K 59/8793 Arrangements for polarized light emission H10K59/8791 takes precedence

Abstract

Disclosed are an OLED display structure and an OLED display device having the OLED display structure. The OLED display structure comprises: a substrate (10), and an OLED pixel layer (20), a beam splitting layer (5) and a circular polarizer layer (6) which are formed on the substrate (10) in sequence; the beam splitting layer (5) is adapted to divide a light beam into o-light and e-light, and to convert the o-light and the e-light into circularly polarized light which has the same polarization state as the circular polarizer layer (6); the circular polarizer layer (6) is adapted to allow passage of the circularly polarized light which has the same polarization state as it. With the display structure, the light transmittance is improved, and the pixel current of the OLED pixel layer (20) is reduced, and thereby energy is saved.

Claims

1. An Organic Light Emitting Diode (OLED) display structure, comprising:

a substrate and an OLED pixel layer, a beam splitting layer and a circular polarizer layer which are formed on the substrate in sequence, wherein

the beam splitting layer is adapted to divide a light beam into o-light and e-light, and to convert the o-light and the e-light into circularly polarized light which has the same polarization state as the circular polarizer layer; and

the circular polarizer layer is adapted to allow passage of the circularly polarized light which has the same polarization state as it.

2. The OLED display structure claimed as claim 1, wherein the beam splitting layer comprises a birefringent crystal layer, and an o-light quarter-wave plate layer and an e-light quarter-wave plate layer which are formed on the birefringent crystal layer, wherein,

the o-light quarter-wave plate layer is adapted to convert the o-light into circularly polarized light which has the same polarization state as the circular polarizer layer;

and

the e-light quarter-wave plate layer is adapted to convert the e-light into circularly polarized light which has the same polarization state as the circular polarizer layer.

3. The OLED display structure claimed as claim 2, wherein directions of optical axes of the o-light quarter-wave plate layer and the e-light quarter-wave plate layer are perpendicular to each other, and the optical axes of the o-light quarter-wave plate layer and the e-light quarter-wave plate layer form an angle of 45°

with respect to polarization directions of the corresponding o-light and e-light, respectively.

4. The OLED display structure claimed as claim 2, wherein the birefringent crystal layer is made from calcite crystal, quartz or ruby.

5. The OLED display structure claimed claim 1, wherein the circular polarizer layer comprises a quarter-wave plate layer and a linear polarizer formed on the quarter-wave plate layer, wherein

the quarter-wave plate layer is adapted to convert circularly polarized light into linearly polarized light;

and

the linear polarizer is adapted to allow passage of linearly polarized light which has the same polarization direction as its.

6. The OLED display structure claimed claim 1, further comprising a lens layer, which is located between the OLED pixel layer and the beam splitting layer, and adapted to converge light beams which are emitted from the OLED pixel layer to be parallel light beams to enter the beam splitting layer.

7. The OLED display structure claimed as claim 6, wherein the lens layer comprises a transparent substrate, and a first convex lens and a second convex lens which are formed on two sides of the transparent substrate, respectively, wherein

focal points or focal planes of the first convex lens and the second convex lens coincide with each other.

8. The OLED display structure claimed as claim 6, wherein the lens layer comprises a transparent substrate, and a first convex lens and a concave lens microstructure layer which are formed on two sides of the transparent substrate, respectively, wherein

the first convex lens and the concave lens microstructure layer cooperate to converge light beams into parallel light beams.

9. The OLED display structure claimed as claim 7, wherein the transparent substrate further comprises a reflective layer, by which ambient light is reflected to the circular polarizer layer for absorption.

10. An Organic Light Emitting Diode (OLED) display device, comprising the OLED display structure claimed as claim 1.

11. The OLED display structure claimed as claim 3, wherein the birefringent crystal layer is made from calcite crystal, quartz or ruby.

12. The OLED display structure claimed as claim 2, wherein the circular polarizer layer comprises a quarter-wave plate layer and a linear polarizer formed on the quarter-wave plate layer, wherein

the quarter-wave plate layer is adapted to convert circularly polarized light into linearly polarized light;

and

the linear polarizer is adapted to allow passage of linearly polarized light which has the same polarization direction as its.

13. The OLED display structure claimed as claim 3, wherein the circular polarizer layer comprises a quarter-wave plate layer and a linear polarizer formed on the quarter-wave plate layer, wherein

the quarter-wave plate layer is adapted to convert circularly polarized light into linearly polarized light;

and

the linear polarizer is adapted to allow passage of linearly polarized light which has the same polarization direction as its.

14. The OLED display structure claimed as claim 2, further comprising a lens layer, which is located between the OLED pixel layer and the beam splitting layer, and adapted to converge light beams which are emitted from the OLED pixel layer to be parallel light beams to enter the beam splitting layer.

15. The OLED display structure claimed as claim 3, further comprising a lens layer, which is located between the OLED pixel layer and the beam splitting layer, and adapted to converge light beams which are emitted from the OLED pixel layer to be parallel light beams to enter the beam splitting layer.

16. The OLED display structure claimed as claim 8, wherein the transparent substrate further comprises a reflective layer, by which ambient light is reflected to the circular polarizer layer for absorption.