ELECTROLUMINESCENT DISPLAY DEVICE

• US 20200135829A1
• Filed: 08/21/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, Gyungmin, Eom, HyeSeon, Yoon, DooHyun
• Granted Patent: US 11,024,691 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G06F 1/163 Wearable computers, e.g. on a belt
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• 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 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

Discussed is an electroluminescent display device, wherein a first electrode of a first sub pixel includes a first lower electrode and a first upper electrode, a first electrode of a second sub pixel includes a second lower electrode and a second upper electrode, a first electrode of a third sub pixel includes a third lower electrode and a third upper electrode, a distance between the first lower electrode and the first upper electrode, a distance between the second lower electrode and the second upper electrode, and a distance between the third lower electrode and the third upper electrode are different from one another, the third upper electrode includes a third lower layer and a third upper layer, and the third lower layer is formed in the same pattern as that of the third lower electrode in an upper surface of the third lower electrode.

Claims

1. An electroluminescent display device comprising:

a substrate including a first sub pixel and a second sub pixel which are adjacent to each other;

a driving thin film transistor provided in each of the first sub pixel and the second sub pixel, and configured to include a gate electrode, a source electrode, and a drain electrode;

a first capacitor electrically connected with gate and source electrodes of the driving thin film transistor provided in the first sub pixel; and

a second capacitor electrically connected with gate and source electrodes of the driving thin film transistor provided in the second sub pixel,

wherein the first capacitor extends from the first sub pixel to the second sub pixel, and the second capacitor extends from the second sub pixel to the first sub pixel.

2. The electroluminescent display device according to claim 1,

wherein the first capacitor includes a first capacitor lower electrode which is electrically connected with any one of the gate and source electrodes of the driving thin film transistor provided in the first sub pixel, and a first capacitor upper electrode which is electrically connected with the other one of the gate and source electrodes of the driving thin film transistor provided in the first sub pixel, and

wherein the first capacitor lower electrode is overlapped with the first sub pixel and the second sub pixel, and the first capacitor upper electrode is overlapped with the first sub pixel and the second sub pixel.

3. The electroluminescent display device according to claim 2, wherein the first capacitor upper electrode includes a first lower layer and a first upper layer which are electrically connected with each other.

4. The electroluminescent display device according to claim 3, wherein an area of the first lower layer is larger than an area of the first upper layer.

5. The electroluminescent display device according to claim 3, wherein a distance between the first lower layer and the first capacitor lower electrode is shorter than a distance between the first lower layer and the first upper layer.

6. The electroluminescent display device according to claim 2, wherein the source electrode of the driving thin film transistor provided in the first sub pixel is electrically connected with an anode electrode provided in the first sub pixel.

7. The electroluminescent display device according to claim 6, wherein the first capacitor upper electrode is connected with the anode electrode via two connection electrodes provided in different layers.

8. The electroluminescent display device according to claim 2, wherein the source electrode of the driving thin film transistor provided in the first sub pixel is electrically connected with a high power source line arranged in a first direction.

9. The electroluminescent display device according to claim 8, wherein the first capacitor upper electrode is connected with the high power source line via one connection electrode.

10. The electroluminescent display device according to claim 2,

wherein the second capacitor includes a second capacitor lower electrode which is electrically connected with any one of the gate and source electrodes of the driving thin film transistor provided in the second sub pixel, and a second capacitor upper electrode which is electrically connected with the other one of the gate and source electrodes of the driving thin film transistor provided in the second sub pixel, and

wherein the second capacitor lower electrode is overlapped with the first sub pixel and the second sub pixel, and the second capacitor upper electrode is overlapped with the first, sub pixel and the second sub pixel.

11. The electroluminescent display device according to claim 10,

wherein the second capacitor lower electrode is overlapped with the first capacitor lower electrode and the first capacitor upper electrode, and

the second capacitor upper electrode is overlapped with the first capacitor lower electrode and the first capacitor upper electrode.

12. The electroluminescent display device according to claim 10,

wherein the source electrode of the driving thin film transistor provided in the second sub pixel is electrically connected with an anode electrode provided in the second sub pixel, and

the second capacitor upper electrode is connected with the anode electrode through a via penetrating through an insulating layer.

13. The electroluminescent display device according to claim 10,

wherein the source electrode of the driving thin film transistor provided in the second sub pixel is electrically connected with a high power source line arranged in a first direction, and

the second capacitor upper electrode is connected with the high power source line through a via penetrating through an insulating layer.

14. The electroluminescent display device according to claim 10,

wherein an area of the second capacitor lower electrode is larger than an area of the first capacitor lower electrode, and the first capacitor lower electrode is provided with a cut-off area formed in an area where the second capacitor lower electrode is electrically connected with the gate electrode of the driving thin film transistor provided in the second sub pixel.

15. An electroluminescent display device comprising:

a substrate including a first sub pixel and a second sub pixel which are adjacent to each other;

a driving thin film transistor provided in each of the first sub pixel and the second sub pixel, and configured to include a gate electrode, a source electrode, and a drain electrode;

a first capacitor electrically connected with gate and source electrodes of the driving thin film transistor provided in the first sub pixel; and

a second capacitor electrically connected with gate and source electrodes of the driving thin film transistor provided in the second sub pixel,

wherein the first capacitor is overlapped with the second capacitor in the first sub pixel, and the first capacitor is overlapped with the second capacitor in the second sub pixel.

16. The electroluminescent display device according to claim 15, wherein the first capacitor and the second capacitor are provided in different layers on the substrate.

17. The electroluminescent display device according to claim 16,

wherein the first capacitor includes a first capacitor lower electrode and a first capacitor upper electrode,

the second capacitor includes a second capacitor lower electrode and a second capacitor upper electrode, and

the second capacitor lower electrode is provided above the first capacitor upper electrode.

18. The electroluminescent display device according to claim 17,

wherein the first capacitor lower electrode, the first capacitor upper electrode, the second capacitor lower electrode, and the second capacitor upper electrode are overlapped with one another in each of the first sub pixel and the second sub pixel.

19. The electroluminescent display device according to claim 15, further comprising a hank provided in a boundary between the first sub pixel and the second sub pixel, and an emission layer provided on the bank,

wherein a trench is provided inside the bank, and some portions of the emission layer are disconnectedly provided in the trench.

20. The electroluminescent display device according to claim 15, further comprising:

a lens array which is apart from the substrate; and

a receiving case configured to receive the substrate and the lens array therein.