Multi-color LED pixel unit and micro-LED display panel

1. A multi-color light emitting pixel unit, comprising:

a substrate;

a bottom conductive layer formed on the substrate and a top conductive layer formed over the bottom conductive layer; and

a light emitting layer formed between the top conductive layer and the bottom conductive layer,

wherein the light emitting layer includes a plurality of micro-gap structures, and

each one of the micro-gap structures is an air gap.

2. The multi-color light emitting pixel unit of claim 1 , wherein each one of the micro-gap structures extends along a direction perpendicular to the substrate and penetrates the light emitting layer.

3. The multi-color light emitting pixel unit of claim 1 , wherein a cross-sectional dimension of each one of the air gaps is not more than 2 nm.

4. The multi-color light emitting pixel unit of claim 1 , wherein each one of the micro-gap structures is sealed between the top conductive layer and the bottom conductive layer.

5. The multi-color light emitting pixel unit of claim 1 , wherein the light emitting layer is a first light emitting layer,

the multi-color light emitting pixel unit further including:

a second light emitting layer formed between the first light emitting layer and the bottom conductive layer.

6. The multi-color light emitting pixel unit of claim 5 , wherein the plurality of micro-gap structures included in the first light emitting layer are a first plurality of micro-gap structures,

the second light emitting layer including a second plurality of micro-gap structures.

7. The multi-color light emitting pixel unit of claim 6 , wherein the first plurality of micro-gap structures are not vertically aligned with the second plurality of micro-gap structures.

8. The multi-color light emitting pixel unit of claim 6 , further comprising:

a metal layer formed between the first light emitting layer and the second light emitting layer, and

a top isolation layer formed between the first light emitting layer and the top conductive layer.

9. The multi-color light emitting pixel unit of claim 8 , wherein

the first plurality of micro-gap structures are sealed between the top isolation layer and the metal layer, and

the second plurality of micro-gap structures are sealed between the metal layer and the bottom conductive layer.

10. The multi-color light emitting pixel unit of claim 5 , wherein the multi-color light emitting pixel unit further includes:

a third light emitting layer formed between the second light emitting layer and the bottom conductive layer.

11. The multi-color light emitting pixel unit of claim 10 , wherein the plurality of micro-gap structures included in the first light emitting layer are a first plurality of micro-gap structures and at least one of the second light emitting layer and the third light emitting layer includes a plurality of second micro-gap structures.

12. The multi-color light emitting pixel unit of claim 10 , wherein the plurality of micro-gap structures included in the first light emitting layer are a first plurality of micro-gap structures,

the second light emitting layer including a second plurality of micro-gap structures, and

the third light emitting layer including a third plurality of micro-gap structures.

13. The multi-color light emitting pixel unit of claim 12 , wherein

the first plurality of micro-gap structures are not vertically aligned with the second plurality of micro-gap structures, and

the second plurality of micro-gap structures are not vertically aligned with the third plurality of micro-gap structures.

14. The multi-color light emitting pixel unit of claim 12 , further comprising:

a first metal layer formed between the first light emitting layer and the second light emitting layer;

a second metal layer formed between the second light emitting layer and the third light emitting layer; and

a top isolation layer formed between the first light emitting layer and the top conductive layer.

15. The multi-color light emitting pixel unit of claim 14 , wherein

the first plurality of micro-gap structures are sealed between the top isolation layer and the first metal layer,

the second plurality of micro-gap structures are sealed between the first metal layer and the second metal layer, and

the third plurality of micro-gap structures are sealed between the second metal layer and the bottom conductive layer.

16. A micro display panel comprising the multi-color light emitting pixel unit of claim 1 .