Organic light emitting diode display having high luminescence

Patent metadata

Field	Value
Publication number	US-10236332-B2
Application number	US-201314103232-A
Country	US
Kind code	B2
Filing date	Dec 11, 2013
Priority date	Dec 12, 2012
Publication date	Mar 19, 2019
Grant date	Mar 19, 2019

Abstract

The present disclosure relates to an organic light emitting diode display having high luminescence. The present disclosure suggests an organic light emitting diode display comprising: a data line, a scan line and a driving current line defining a pixel area on a substrate; an anode electrode formed within the pixel area; an additional capacitance formed by overlapping expanded portions of the anode electrode with some portions of the driving current line; a bank defining a light emitting area in the anode electrode; an organic emission layer formed on the anode electrode; and a cathode electrode formed on the organic emission layer. The present disclosure suggests high luminescence organic light emitting diode display by including an additional capacitance for increasing the anode capacitance.

First claim

What is claimed is:

1. An organic light emitting diode display comprising:
a data line and a plurality of scan lines on a substrate;
a driving current line allocated to a pixel column including a first pixel area and a second pixel area on the substrate;
wherein the first pixel area and the second pixel area included in the pixel column each include:
an anode electrode including an expanded portion that covers two edges of the driving current line, the expanded portion of the anode electrode overlaps an entire width of the driving current line;
a capacitance formed between the expanded portion of the anode electrode that overlaps the entire width of the driving current line;
an organic emission layer disposed on the anode electrode;
a cathode electrode disposed on the organic emission layer;
a bank defining a light emitting area in the anode electrode as an anode of an organic light emitting diode, the anode of the organic light emitting diode overlapping the cathode and the organic emission layer;
a color filter disposed under the anode electrode; and
a driving thin film transistor electrically connected to the anode electrode, the driving thin film transistor at a first side of the color filter;
wherein the driving current line is at a second side of the color filter that is opposite the first side of the color filter, and the driving current line non-overlapping with the driving thin film transistor;
wherein the capacitance is formed outside of the light emitting area and wherein the bank is over substantially an entire area of the capacitance and the bank is not overlapped with the anode of the organic light emitting diode.

2. The device according to the claim 1 , wherein at least one of the first pixel area and the second pixel area further comprises:
an over coat layer covering the color filter, and disposed under the anode electrode.

3. The device according to the claim 1 , wherein each of the first pixel area and the second pixel area each further comprises:
a switching thin film transistor connected to the data line and the scan line; and
wherein the driving thin film transistor is connected to the switching thin film transistor and the driving current line.

4. The device according to the claim 3 , wherein one of a drain electrode and a source electrode of the switching thin film transistor is connected to a gate electrode of the driving thin film transistor, and
one of a drain electrode and a source electrode of the driving thin film transistor is connected to the anode electrode.

5. The device according to the claim 4 , further comprising:
a storage capacitance formed between a gate electrode of the driving thin film transistor and the anode electrode.

6. An organic light emitting diode display comprising:
data lines and scan lines defining pixel areas on a substrate;
a driving current line commonly allocated between a first pixel column and a second pixel column, the first pixel column and the second pixel column neighboring each other among the pixel areas;
a first anode electrode disposed at the first pixel column, and a second anode electrode disposed at the second pixel column, the first anode electrode including an expanded portion that overlaps a first portion of the driving current line, and the second anode electrode including an expanded portion that overlaps a second portion of the driving current line, wherein an amount of overlap between the expanded portion of the first anode electrode and the first portion of the driving current line is substantially the same as an amount of overlap between the expanded portion of the second anode electrode and the second portion of the driving current line;
a first capacitance formed between the expanded portion of the first anode electrode that overlaps the first portion of the driving current line, and a second capacitance formed between the expanded portion of the second anode electrode that overlaps the second portion of the driving current line;
an organic emission layer disposed on the first anode electrode and the second anode electrode;
a cathode electrode disposed on the organic emission layer and an electron transport layer, and
a bank defining a first light emitting area in the first anode electrode as an anode of a first organic light emitting diode and the bank defining a second light emitting area in the second anode electrode as an anode of the second organic light emitting diode, wherein the anode of the first organic light emitting diode overlaps a first portion of the cathode and a first portion of the organic emission layer, and wherein the anode of the second organic light emitting diode overlaps a second portion of the cathode and a second portion of the organic emission layer;
a color filter disposed under the first and the second anode electrodes within the pixel areas; and
an over coat layer covering the color filter, and disposed under the first and the second anode electrodes;
a driving thin film transistor electrically connected to the first anode electrode, the driving thin film transistor at a first side of the color filter;
wherein the driving current line is at a second side of the color filter that is opposite the first side of the color filter, and the driving current line non-overlapping with the driving thin film transistor;
wherein the first capacitance and the second capacitance are formed outside of the first light emitting area and the second light emitting area, and the first capacitance and the second capacitance are formed at the space filled with the over coat layer inserted between the first and the second anode electrodes and the driving current line.

7. The device according to the claim 6 , wherein the first anode electrode and the second electrode are disposed with a predetermined distance on the driving current line.

8. The device according to the claim 6 , further comprising:
a switching thin film transistor connected to the data line and the scan line in the each pixel area; and
wherein the driving thin film transistor is connected to the switching thin film transistor and the driving current line.

9. The device according to the claim 8 , wherein one of a drain electrode and a source electrode of the switching thin film transistor is connected to a gate electrode of the driving thin film transistor, and
one of a drain electrode and a source electrode of the driving thin film transistor is connected to at least one of the first and the second anode electrodes.

10. The device according to the claim 9 , further comprising;
a storage capacitance formed between a gate electrode of the driving thin film transistor and at least one of the first and the second anode electrodes.

11. An organic light emitting diode display comprising:
a data line and a plurality of scan lines on a substrate;
a driving current line allocated to a pixel column including a first pixel area and a second pixel area on the substrate;
wherein the first pixel area and the second pixel area included in the pixel column each include:
an anode electrode including an expanded portion that overlaps the driving current line for forming an additional anode capacitance between the expanded portion of the anode electrode and the driving current line;
an organic emission layer disposed on the anode electrode;
a cathode electrode disposed on the organic emission layer overlapping the anode electrode for forming an anode capacitance between the anode electrode and the cathode electrode; and
a bank defining a light emitting area in the anode electrode;
a color filter disposed under the anode electrode; and
a driving thin film transistor electrically connected to the anode electr

Assignees

• Lg Display Co Ltd

Inventors

• Jung Kimoon
• Hwang Soonjae
• Shim Jongsik

Classifications

• H01L27/3265 Primary

  Electricity · mapped topic

• H10D86/481

  integrated with passive devices, e.g. auxiliary capacitors · CPC title

• H10K59/1216 Primary

  the pixel elements being capacitors · CPC title

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10K59/121 Primary

  characterised by the geometry or disposition of pixel elements · CPC title