Electroluminescent display apparatus

Patent metadata

Field	Value
Publication number	US-10896646-B2
Application number	US-201916436304-A
Country	US
Kind code	B2
Filing date	Jun 10, 2019
Priority date	Dec 27, 2018
Publication date	Jan 19, 2021
Grant date	Jan 19, 2021

Abstract

An electroluminescent display apparatus includes a plurality of unit circuits, each of the plurality of unit circuits including a connection electrode and a driving thin film transistor (TFT), the connection electrode of each of the plurality of unit circuits electrically connected to a gate electrode of the driving TFT included in the unit circuit, a plurality of anode electrodes, each of the plurality of anode electrodes connected to the driving TFT of a corresponding unit circuit, a bank covering an edge of each of the plurality of anode electrodes, the bank defining an emission area for each anode electrode, a light emitting layer on each of the plurality of anode electrodes, and a cathode electrode on the light emitting layer. Each of the plurality of anode electrodes overlaps the gate electrode of the driving TFT and the connection electrode of a corresponding one of the plurality of unit circuits.

First claim

What is claimed is:

1. An electroluminescent display apparatus comprising:
a plurality of unit circuits, each of the plurality of unit circuits including a connection electrode and a driving thin film transistor TFT, the connection electrode of each of the plurality of unit circuits electrically connected to a gate electrode of the driving TFT included in the unit circuit;
a plurality of anode electrodes, each of the plurality of anode electrodes connected to the driving TFT of a corresponding unit circuit of the plurality of unit circuits;
a bank covering an edge of each of the plurality of anode electrodes, the bank defining an emission area for each anode electrode;
a light emitting layer on each of the plurality of anode electrodes; and
a cathode electrode on the light emitting layer,
wherein each of the plurality of anode electrodes overlaps the gate electrode of the driving TFT and the connection electrode of a corresponding one of the plurality of unit circuits.

2. The electroluminescent display apparatus of claim 1 , wherein the connection electrode electrically connects the gate electrode of the driving TFT to a drain electrode of another TFT.

3. The electroluminescent display apparatus of claim 1 , wherein at least one anode electrode of the plurality of anode electrodes comprises a first portion and a second portion that protrudes from the first portion, the first portion having a shape corresponding to the emission area of the anode electrode, and
wherein the second portion of the at least one anode electrode extends past the emission area of the at least one anode electrode and overlaps the connection electrode.

4. The electroluminescent display apparatus of claim 3 , wherein the second portion overlaps the bank.

5. The electroluminescent display apparatus of claim 3 , wherein the at least one anode electrode overlaps a plurality of unit circuits.

6. The electroluminescent display apparatus of claim 3 , wherein
the at least one anode electrode further comprises a third portion protruding from the first portion, and
the third portion overlaps a gate electrode of another driving TFT that is not electrically connected to the at least one anode electrode, and a connection electrode that is connected to the gate electrode of the other driving TFT.

7. The electroluminescent display apparatus of claim 3 , wherein another anode electrode of the plurality of anode electrodes overlaps a gate electrode of another driving TFT, and a connection electrode that is connected to the gate electrode of the other driving TFT, the other driving TFT electrically connected to the other anode electrode.

8. The electroluminescent display apparatus of claim 7 , wherein
the other anode electrode comprises a first portion and a second portion that protrudes from the first portion, the first portion having a shape corresponding to the emission area of the other anode electrode, and
wherein the second portion of the other anode electrode extends past the emission area of the other anode electrode and overlaps the gate electrode of the other driving TFT and the connection electrode connected to the gate electrode of the other driving TFT, the other driving TFT electrically connected to the other anode electrode.

9. An electroluminescent display apparatus comprising:
a first unit circuit including a first driving thin film transistor (TFT) and a second unit circuit including) a second driving TFT;
a first anode electrode electrically connected to the first driving TFT of the first unit circuit;
a second anode electrode electrically connected to the second driving TFT of the second unit circuit;
a bank covering an edge of the first anode electrode and an edge of the second anode electrode, the bank defining a first emission area of the first anode electrode and a second emission area of the second anode electrode;
a light emitting layer on the first anode electrode and the second anode electrode; and
a cathode electrode on the light emitting layer,
wherein the first anode electrode and the first emission area overlap the first unit circuit and the second unit circuit, and the first anode electrode overlaps a gate electrode of the first driving TFT of the first unit circuit, but does not overlap a gate electrode of the second driving TFT of the second unit circuit.

10. The electroluminescent display apparatus of claim 9 , wherein the gate electrode of the first driving TFT of the first unit circuit is electrically connected to a drain electrode of an additional TFT through a connection electrode, and
wherein the first anode electrode overlaps the connection electrode.

11. The electroluminescent display apparatus of claim 9 , wherein
the first anode electrode comprises a first portion and a second portion that protrudes from the first portion, the first portion having a shape corresponding to the first emission area of the first anode electrode, and
wherein the second portion of the first anode electrode extends past the emission area of the first anode electrode and overlaps the gate electrode of the first driving TFT of the first unit circuit.

12. The electroluminescent display apparatus of claim 9 , wherein the second anode electrode does not overlap a gate electrode of the second driving TFT of the second unit circuit.

13. The electroluminescent display apparatus of claim 12 , wherein the first anode electrode overlaps the gate electrode of the second driving TFT of the second unit circuit.

14. An electroluminescent display apparatus comprising:
a first anode electrode provided in a first subpixel and a second anode electrode provided in a second subpixel;
a bank covering an edge of the first anode electrode and an edge of the second anode electrode, the bank defining a first emission area of the first anode electrode and a second emission area of the second anode electrode;
a light emitting layer on the first anode electrode and the second anode electrode; and
a cathode electrode on the light emitting layer,
wherein the first anode electrode has a shape corresponding to the first emission area, and the second anode electrode has a shape that does not correspond to the second emission area.

15. The electroluminescent display apparatus of claim 14 , wherein the second anode electrode comprises a first portion and a second portion that protrudes from the first portion, the first portion of the second anode electrode having a shape corresponding to the second emission area of the second anode electrode, and the second portion of the second anode electrode extends past the second emission area of the second anode electrode.

16. The electroluminescent display apparatus of claim 15 , further comprising a plurality of unit circuits provided under the first anode electrode and the second anode electrode, the plurality of unit circuits each including a connection electrode and a driving TFT, the connection electrode electrically connected to a gate electrode of the driving TFT,
wherein the second portion of the second anode electrode overlaps the gate electrode of the driving TFT and the connection electrode of a corresponding one of the plurality of unit circuits.

17. The electroluminescent display apparatus of claim 16 , wherein the second anode electrode overlaps the plurality of unit circuits.

18. An electroluminescent display apparatus comprising:
a substrate;
a driving thin film transistor (TFT) on the substrate, the driving TFT comprising a gate electrode;
a connection electrode electrically connected to the gate electrode of the driving TF

Assignees

• Lg Display Co Ltd

Inventors

• Kim Jiyun
• Lee Jung-Min

Classifications

• H10K59/35

  comprising red-green-blue [RGB] subpixels · CPC title

• H10K59/131

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

• G09G2300/0861

  with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes · CPC title

• G09G3/3233

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title