DISPLAY DEVICE AND METHOD OF PRODUCING THE SAME

• US 20090102372A1
• Filed: 05/09/2007
• Published: 04/23/2009
• Est. Priority Date: 05/10/2006
• Status: Abandoned Application

• Current Assignee: Showa Denko KK
• Original Assignee: Showa Denko KK
• Inventors: Sako, Kanjiro, Kondo, Kunio, Watanabe, Takeo
• Application Number:
  US12/300,293
• Publication Number:
  US 20090102372A1
• Time in Patent Office: Days
• US Class Current: 313/504
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1007 Non-condensed systems
• CPC Class Codes: C09K 2211/1011 Condensed systems
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/1033 with oxygen
• CPC Class Codes: C09K 2211/1037 with sulfur
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/1092 containing sulfur as the only heteroatom
• CPC Class Codes: C09K 2211/185 of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 59/221 Static displays, e.g. displaying permanent logos

Abstract

Disclosed is a display device displaying a predetermined pattern comprising an organic electroluminescence element comprising a transparent anode, an organic electroluminescent compound layer, a cathode buffer layer patterned predetermined pattern and a cathode insulating substrate. The display device can display a predetermined pattern with high electrical power efficiency by a simple structure.

Claims

1. A display device displaying a predetermined pattern comprising an organic electroluminescence element comprising a transparent anode, an organic electroluminescent compound layer, a cathode buffer layer patterned in an almost similar form to the predetermined pattern and a cathode laminated in this order on a transparent insulating substrate.

2. The display device according to claim 1, wherein the organic electroluminescent compound layer comprises a phosphorescent compound.

3. The display device according to claim 2, wherein the phosphorescent compound is an iridium complex.

4. The display device according to claim 2, wherein the phosphorescent compound is a phosphorescent polymer compound.

5. The display device according to claim 4, wherein the phosphorescent polymer compound is a phosphorescent non-conjugated polymer compound.

6. The display device according to claim 5, wherein the phosphorescent non-conjugated polymer compound is a polymer compound having a structural unit derived from an iridium complex compound that is obtained by substituting a polymerizable substituent for one or more hydrogen atoms contained in a compound represented by the following formula (X-1),

in the formula (X-1), R¹ to R⁸ each represent independently an atom or a substituent selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, an alkyl group having from 1 to 10 carbon atoms, an aryl group having from 6 to 10 carbon atoms, an amino group optionally substituted with an alkyl group having from 1 to 10 carbon atoms, an alkoxy group having from 1 to 10 carbon atoms, and a silyl group;

R¹ and R², R² and R³, R³ and R⁴, R⁴ and R⁵, R⁵ and R⁶, R⁶ and R⁷, or R⁷ and R⁸ may be bonded together to form a condensed ring; and

L is a bidentate ligand selected from the group consisting of the following formulae (X-2) to (X-4),

in the formula (X-2), R¹¹ to R¹⁸ are the same as R¹ to R⁸ in the formula (X-1),

in the formula (X-3), R²¹ to R²³ each represent independently an atom or a substituent selected from the group consisting of a hydrogen atom, a cyano group, an alkyl group having from 1 to 10 carbon atoms, an aryl group having from 6 to 10 carbon atoms, an amino group optionally substituted with an alkyl group having from 1 to 10 carbon atoms, an alkoxy group having from 1 to 10 carbon atoms, and a silyl group; and

R²¹ and R²², or R²² and R²³ may be bonded together to form a condensed ring,

in the formula (X-4), R³¹ to R³⁴ each represent independently an atom or a substituent selected from the group consisting of a hydrogen atom, a cyano group, an alkyl group having from 1 to 10 carbon atoms, an aryl group having from 6 to 10 carbon atoms, an amino group optionally substituted with an alkyl group having from 1 to 10 carbon atoms, an alkoxy group having from 1 to 10 carbon atoms, and a silyl group; and

R³¹ and R³², R³² and R³³, or R³³ and R³⁴ may be bonded together and form a condensed ring.

7. The display device according to claim 5, wherein the phosphorescent non-conjugated polymer compound is a polymer compound having a structural unit derived from an iridium complex compound that is obtained by substituting a polymerizable substituent for one or more hydrogen atoms contained in at least one kind of compound selected from the group consisting of compounds represented by the following formulae (E-2), (E-17), (E-32), and (E-33),

10. A cellular phone display screen comprising the display device according to claim 1.

11. A portable music player display screen comprising the display device according to claim 1.

12. An in-vehicle rearview mirror comprising the display device according to claim 1.

13. A mirror comprising the display device according to claim 1.

14. A display device for theaters comprising the display device according to claim 1.

8. A method of producing a display device displaying a predetermined pattern comprising steps of:

forming a cathode buffer layer patterned in an almost similar form to the predetermined pattern on the surface of an organic electroluminescent compound layer; and

forming a cathode on the surface of the cathode buffer layer.

9. The method of producing a display device according to claim 8, comprising,

in the step of forming the cathode buffer layer, depositing a material for forming the cathode buffer layer on the organic electroluminescent compound layer through a mask having an opening that is patterned in an almost similar form to the predetermined pattern, and

in the step of forming the cathode, subsequently forming the cathode after removing the mask.