Organic light emitting diode display

• US 8,169,386 B2
• Filed: 07/23/2009
• Issued: 05/01/2012
• Est. Priority Date: 08/19/2008
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Soon-Ryong, Jeong, Hee-Seong, Jung, Woo-Suk, Jeon, Hee-Chul, Kwak, Noh-Min, Kim, Eun-Ah, Lee, Joo-Hwa, Jeong, Chul-Woo, Kim, Jae-Yong
• Primary Examiner(s): Lao, Lun-Yi
• Assistant Examiner(s): SHENG, TOM V
• Application Number:
  US12/508,438
• Publication Number:
  US 20100045576A1
• Time in Patent Office: 1,013 Days
• Field of Search: 345/76, 345/77, 345/80, 345/82, 345/83, 345/204, 345/205, 345/206, 313/503, 313/504, 313/505, 313/506, 313/113, 257/40, 257/59, 257/72, 257/642, 257/643, 257/759, 257E51001-E51052, 257E25008-E25009, 362/19, 362/800
• US Class Current: 345/76
• CPC Class Codes: H10K 50/854 comprising scattering means
• 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 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An organic light emitting diode display is disclosed. In one embodiment, the display includes 1) an organic light emitting diode comprising i) a pixel electrode, ii) an organic emission layer formed on the pixel electrode, and iii) a common electrode formed on the organic emission layer, 2) a dual brightness enhancement film formed over the common electrode of the organic light emitting diode, 3) a first phase delaying plate formed on the dual brightness enhancement film, 4) a corner cube film formed on the first phase delaying plate, 5) a second phase delaying plate formed on the corner cube film and a 6) polarizing plate formed on the second phase delaying plate, wherein at least one of the elements 2)-5) is configured to reduce reflection of external light incident onto the polarizing plate and/or reduce the loss of light emitted from the organic emission layer before outputting the emitted light through the polarizing plate.

Claims

1. An organic light emitting diode display, comprising:

an organic light emitting diode comprising i) a pixel electrode, ii) an organic emission layer formed on the pixel electrode, and iii) a common electrode formed on the organic emission layer;

a dual brightness enhancement film formed over the common electrode of the organic light emitting diode;

a first phase delaying plate formed on the dual brightness enhancement film;

a corner cube film formed on the first phase delaying plate;

a second phase delaying plate formed on the corner cube film; and

a polarizing plate formed on the second phase delaying plate, wherein at least one of i) the dual brightness enhancement film, ii) the first phase delaying plate, iii) the second phase delaying plate and iv) the corner cube film is configured to reduce reflection of external light incident onto the polarizing plate and/or reduce the loss of light emitted from the organic emission layer before outputting the emitted light through the polarizing plate.

2. The organic light emitting diode display of claim 1, wherein the corner cube film comprises a corner cube layer on which a plurality of corner cubes are formed, and a cover layer covering one surface of the corner cube layer on which the corner cubes are formed.

3. The organic light emitting diode display of claim 2, wherein the corner cubes of the corner cube layer protrude toward the first phase delaying plate.

4. The organic light emitting diode display of claim 3, wherein the corner cube layer has a larger refractive index than the cover layer.

5. The organic light emitting diode display of claim 2, wherein the cover layer has adherence.

6. The organic light emitting diode display of claim 5, wherein the cover layer is disposed between the corner cube plate and the first phase delay layer to adhere the corner cube layer to the first phase delaying plate.

7. The organic light emitting diode display of claim 1, wherein at least two of the dual brightness enhancement film, the first phase delaying plate, the corner cube film, the second phase delaying plate, and the polarizing plate are integrally formed.

8. The organic light emitting diode display of claim 1, wherein the polarizing plate and the dual brightness enhancement film have the same polarizing axis.

9. The organic light emitting diode display of claim 8, wherein the first phase delaying plate and the second phase delaying plate have the same optical axis and are ¼

wavelength plates.

10. The organic light emitting diode display of claim 9, wherein an intersecting angle between the optical axis of the first phase delaying plate and the second phase delaying plate and the polarizing axis of the polarizing plate and the dual brightness enhancement film is 45°

.

11. The organic light emitting diode display of claim 1, further comprising:

a first substrate;

a driving circuit interposed between the first substrate and the organic light emitting diode, wherein the driving circuit is configured to drive the organic light emitting diode; and

a second substrate formed on the polarizing plate and configured to display images based on the linearly polarized light transmitted from the polarizing plate.

12. An organic light emitting diode display, comprising:

an organic light emitting diode configured to emit first circularly polarized light;

a dual brightness enhancement film formed over the organic light emitting diode, wherein the dual brightness enhancement film is configured to input the first circularly polarized light and output first linearly polarized light;

a first phase delaying plate formed on the dual brightness enhancement film, wherein the first phase delaying plate is configured to input the first linearly polarized light and output second circularly polarized light;

a corner cube film formed on the first phase delaying plate and configured to transmit the second circularly polarized light;

a second phase delaying plate formed on the corner cube film, wherein the second phase delaying plate is configured to input the second circularly polarized light and output second linearly polarized light; and

a polarizing plate formed on the second phase delaying plate and configured to transmit the second linearly polarized light.

13. The organic light emitting diode display of claim 12, wherein the dual brightness enhancement film is further configured to partially reflect circularly polarized light toward the organic light emitting diode.

14. The organic light emitting diode display of claim 12, wherein the corner cube film comprises i) a corner cube layer facing the second phase delaying plate and ii) a cover layer contacting the corner cube layer and facing the first phase delaying plate, and wherein the corner cube layer has a larger refractive index than the cover layer.

15. The organic light emitting diode display of claim 12, wherein the polarizing plate and the dual brightness enhancement film have the same polarizing axis.

16. The organic light emitting diode display of claim 12, wherein the first phase delaying plate and the second phase delaying plate have the same optical axis and are ¼

wavelength plates.

17. An organic light emitting diode display, comprising:

a polarizing plate configured to input external light and output first linearly polarized light;

a first phase delaying plate configured to input the first linearly polarized light and output first circularly polarized light;

a corner cube film configured to partially reflect and partially transmit the first circularly polarized light so as to output second circularly polarized light;

a second phase delaying plate configured to input the second circularly polarized light and output second linearly polarized light;

a dual brightness enhancement film configured to transmit the second linearly polarized light; and

an organic light emitting diode comprising i) first and second electrodes and ii) an organic emission layer interposed between the first and second electrodes, wherein the second electrode faces the dual brightness enhancement film, and wherein the second electrode is configured to reflect the second linearly polarized light toward the dual brightness enhancement film.

18. The organic light emitting diode display of claim 17, wherein the first phase delaying plate is further configured to output the first circularly polarized light toward the corner cube film in a first direction, and wherein the corner cube film is further configured to partially reflect the first circularly polarized light toward the first phase delaying plate in a second direction substantially parallel with the first direction.

19. The organic light emitting diode display of claim 17, wherein at least one of the polarizing plate and first phase delaying plate is further configured to absorb a substantial portion of the light partially reflected from the corner cube film.

20. The organic light emitting diode display of claim 17, wherein the first phase delaying plate, the corner cube film, the second phase delaying plate and the dual brightness enhancement film are sequentially formed.