Organic light emitting diode display

• US 20100176382A1
• Filed: 12/18/2009
• Published: 07/15/2010
• Est. Priority Date: 01/09/2009
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Jae-Yong, Park, Soon-Ryong, Jeong, Hee-Seong, Jung, Woo-Suk, Jeong, Chul-Woo, Lee, Joo-Hwa, Kim, Eun-Ah, Jeon, Hee-Chul, Kwak, Noh-Min
• Granted Patent: US 8,981,349 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 50/86 Arrangements for improving contrast, e.g. preventing reflection of ambient light
• CPC Class Codes: H10K 59/50 OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
• CPC Class Codes: H10K 59/878 comprising reflective means
• CPC Class Codes: H10K 59/8791 Arrangements for improving contrast, e.g. preventing reflection of ambient light

Abstract

An organic light emitting diode display device constructed with an organic light emitting element including a first electrode, an organic emission layer, and a second electrode sequentially laminated together, a transmittance control layer formed on the organic light emitting element, a selective reflective layer formed on the transmittance control layer, a polarizing plate formed on the selective reflective layer, and a phase retardation plate disposed between the organic light emitting element and the polarizing plate.

Claims

1. An organic light emitting diode (OLED) display device, comprising:

an organic light emitting element comprising a first electrode, an organic emission layer, and a second electrode sequentially laminated together;

a transmittance control layer formed on the organic light emitting element;

a selective reflective layer formed on the transmittance control layer;

a polarizing plate formed on the selective reflective layer; and

a phase retardation plate disposed between the organic light emitting element and the polarizing plate.

2. The organic light emitting diode display device of claim 1, wherein

the selective reflective layer is a cholesteric liquid crystal layer, and

the phase retardation plate is disposed between the polarizing plate and the cholesteric liquid crystal layer.

3. The organic light emitting diode display device of claim 2, wherein

the cholesteric liquid crystal layer passes one of left circular polarized light and right circular polarized light and reflects the other one of the left circular polarized light and the right circular polarized light.

4. The organic light emitting diode display device of claim 3, wherein

light that is linearly polarized through the polarizing plate is converted into circular polarized light while passing through the phase retardation plate.

5. The organic light emitting diode display device of claim 4, wherein

the phase retardation plate is a ¼

wavelength plate, and

an intersection angle between an optical axis of the phase retardation plate and a polarization axis of the polarizing plate is 45 degrees.

6. The organic light emitting diode display device of claim 1, wherein

the selective reflective layer is a dual brightness enhancement film, and

the phase retardation plate is disposed between the organic light emitting element and the transmittance control layer or between the transmittance control layer and the dual brightness enhancement film.

7. The organic light emitting diode display device of claim 6, wherein

the polarizing plate has the same polarization axis as the polarization axis of the dual brightness enhancement film.

8. The organic light emitting diode display device of claim 7, wherein

light that is linearly polarized through the dual brightness enhancement film is converted into the circular polarized light while passing through the phase retardation plate.

9. The organic light emitting diode display device of claim 8, wherein

the phase retardation plate is the ¼

wavelength plate, and

the intersection angle between the optical axis of the phase retardation plate and the polarization axis of the polarizing plate is 45 degrees.

10. The organic light emitting diode display device of claim 1, wherein

the transmittance control layer is made of a resin containing a light absorption material.

11. The organic light emitting diode display device of claim 10, wherein

transmittance of light of the transmittance control layer is controlled depending on the kind and content of the light absorption material.

12. The organic light emitting diode display device of claim 10, wherein

the transmittance control layer has a selective transmittance for each wavelength band of light.

13. The organic light emitting diode display device of claim 10, wherein

the resin includes at least one of polycarbonate, polymethyl methacrylate (PMMA), polyether sulfone (PES), polyethylene terephthalate (PET), and triacetate cellulose (TAC).

14. The organic light emitting diode display device of claim 10, wherein

the light absorption material includes at least one of carbon black, a polyene-based pigment, an azo-based pigment, an azomethine-based pigment, a diimmonium-based pigment, a phthalocyanine-based pigment, a quinine-based pigment, an indigo-based pigment, a thioindigo-based pigment, a dioxadin-based pigment, a quinacridone-based pigment, an isoindolinone-based pigment, a metal oxide, a metal complex, and other aromatic hydrocarbons.

15. The organic light emitting diode display device of claim 14, wherein

the polyene-based pigment includes at least one of compounds of the following Chemical Formulas 1 and 2:

16. The organic light emitting diode display device of claim 14, wherein

the azo-based pigment includes a compound of the following Chemical Formula 3:

17. The organic light emitting diode display device of claim 14, wherein

the quinacridone-based pigment includes at least one of compounds of the following Chemical Formulas 4 and 5:

18. The organic light emitting diode display device of claim 14, wherein

the quinine-based pigment includes at least one of compounds of the following Chemical Formulas 6 to 8:

19. The organic light emitting diode display device of claim 14, wherein

the indigo-based pigment includes at least one of compounds of the following Chemical Formulas 9 to 11:

20. The organic light emitting diode display device of claim 14, wherein

the aromatic hydrocarbons include at least one of compounds of Chemical Formulas 12 to 18: