ORGANIC LIGHT EMITTING DIODE DISPLAY

• US 20160218164A1
• Filed: 04/01/2016
• Published: 07/28/2016
• Est. Priority Date: 09/19/2012
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Il-Jeong, Im, Choong-Youl, Kwon, Do-Hyun, Yoon, Ju-Won, Ko, Moo-Soon, Woo, Min-Woo
• Granted Patent: US 9,941,342 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01L 28/40 Capacitors
• CPC Class Codes: H01L 28/60 Electrodes
• CPC Class Codes: H01L 29/4908 for thin film semiconductor, e.g. gate of TFT
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H10K 50/80 Constructional details
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]

Abstract

An organic light emitting diode display includes: a substrate; a substrate insulating layer on the substrate; a capacitor on the substrate insulating layer; a driving thin film transistor including a driving gate electrode connected to the capacitor; and an organic light emitting element connected to the driving thin film transistor, where the capacitor includes: a first capacitor electrode on the substrate insulating layer; a second capacitor electrode on the first capacitor electrode; a capacitor insulating layer between the first capacitor electrode and the second capacitor electrode and contacting the first capacitor electrode and the second capacitor electrode, the capacitor insulating layer having a higher dielectric constant than the substrate insulating layer; and an auxiliary electrode contacting at least one of the first capacitor electrode or the second capacitor electrode.

Claims

1. An organic light emitting diode display comprising:

a substrate;

a substrate insulating layer on the substrate;

a capacitor on the substrate insulating layer;

a driving thin film transistor including a driving gate electrode connected to the capacitor; and

an organic light emitting element connected to the driving thin film transistor,

wherein the capacitor comprises;

a first capacitor electrode on the substrate insulating layer;

a second capacitor electrode on the first capacitor electrode;

a capacitor insulating layer between the first capacitor electrode and the second capacitor electrode and contacting the first capacitor electrode and the second capacitor electrode, the capacitor insulating layer having a higher dielectric constant than the substrate insulating layer; and

an auxiliary electrode contacting at least one of the first capacitor electrode or the second capacitor electrode.

2. The organic light emitting diode display of claim 1, wherein the auxiliary electrode comprises a different material than the first capacitor electrode and the second capacitor electrode.

3. The organic light emitting diode display of claim 2, wherein at least one of the first capacitor electrode or the second capacitor electrode comprises a molybdenum (Mo) alloy including nickel (Ni), and wherein the auxiliary electrode comprises molybdenum (Mo) or titanium (Ti)

4. The organic light emitting diode display of claim 1, wherein the auxiliary electrode comprises:

a first auxiliary electrode contacting the first capacitor electrode; and

a second auxiliary electrode contacting the second capacitor electrode.

5. The organic light emitting diode display of claim 4, wherein the auxiliary electrode further comprises a third auxiliary electrode on the second auxiliary electrode and contacting the second auxiliary electrode, and wherein the third auxiliary electrode comprises the same material as the second capacitor electrode.

6. The organic light emitting diode display of claim 1, wherein the auxiliary electrode comprises a fourth auxiliary electrode contacting the second capacitor electrode.

7. The organic light emitting diode display of claim 6, wherein the auxiliary electrode further comprises a fifth auxiliary electrode on the fourth auxiliary electrode and contacting the fourth auxiliary electrode, and wherein the fifth auxiliary electrode comprises the same material as the second capacitor electrode.

8. The organic light emitting diode display of claim 1, wherein at least one of the first capacitor electrode and the second capacitor electrode comprises the same material as the driving gate electrode.

9. The organic light emitting diode display of claim 1, wherein:

the capacitor insulating layer comprises at least one of zirconium (Zr) oxide, hafnium (Hf) oxide, titanium(Ti) oxide, tantalum (Ta) oxide, lanthanum (La) oxide, yttrium (Y) oxide, barium (Ba) oxide, strontium (Sr) oxide, calcium (Ca) oxide, or magnesium (Mg) oxide.