Manufacturing method of flexible OLED display panel

Patent metadata

Field	Value
Publication number	US-10153462-B2
Application number	US-201615505100-A
Country	US
Kind code	B2
Filing date	Dec 28, 2016
Priority date	Dec 20, 2016
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

The present invention provides a manufacturing method of a flexible OLED display panel, in which multiple loops of inorganic barrier walls are first formed on a rigid base plate such that the multiple loops of inorganic barrier walls respectively and circumferentially encloses a plurality of panel areas on the rigid base plate so that when an organic material film is then coated on the rigid base plate and the multiple loops of inorganic barrier walls in a manner of covering the entirety of surface thereof, the multiple loops of inorganic barrier walls provide an effect of division to allow a plurality of flexible backings to be respectively formed on the plurality of panel areas of the rigid base plate. Afterwards, a laser lift off technique is applied to remove the plurality of flexible backings from the rigid base plate to thus obtain a plurality of flexible OLED display panels. Compared to the prior art, the present invention saves a process of using a laser cutting machine to simultaneously cut the organic material film and the rigid base plate and thus saves the cost of purchasing the laser cutting machine and also save one round of laser cutting operation to thereby reduce the manufacturing cost of a flexible OLED display panel.

First claim

What is claimed is:

1. A manufacturing method of a flexible organic light emitting display (OLED) display panel, comprising the following steps:
Step 1 : providing a rigid base plate and forming multiple loops of inorganic barrier walls, which are spaced from each other, on the rigid base plate such that the multiple loops of inorganic barrier walls respectively and circumferentially enclose a plurality of panel areas on the rigid base plate;
Step 2 : coating an organic material film on the rigid base plate and the multiple loops of inorganic barrier walls, in a manner of covering the entirety of surface thereof, such that as being separated by the multiple loops of inorganic barrier walls, portions of the organic material film that are located on the plurality of panel areas of the rigid base plate respectively form a plurality of flexible backings;
Step 3 : forming a plurality of water/oxygen barrier layers respectively on the plurality of flexible backings, forming, in sequence from bottom to top, thin-film transistor layers and OLED device layers respectively on the plurality of water/oxygen barrier layers, and applying packaging to the thin-film transistor layers and the OLED device layers to form a plurality of thin-film packaging layers respectively on the OLED device layers and the water/oxygen barrier layers such that each of the thin-film packaging layers encloses the OLED device layer and the thin-film transistor layer located thereunder to thereby form a plurality of flexible OLED display panels, which are respectively located in the multiple loops of inorganic barrier walls, on the rigid base plate; and
Step 4 : applying laser lift off (LLO) technology to remove the plurality of flexible backings from the rigid base plate so as to obtain a plurality of flexible OLED display panels.

2. The manufacturing method of the flexible OLED display panel as claimed in claim 1 , wherein the rigid base plate comprises a glass plate.

3. The manufacturing method of the flexible OLED display panel as claimed in claim 1 , wherein the multiple loops of inorganic barrier walls are formed of a material comprising at least one of silicon oxide, silicon nitride, and silicon oxynitride.

4. The manufacturing method of the flexible OLED display panel as claimed in claim 3 , wherein the material of the multiple loops of inorganic barrier walls is silicon oxide, and the multiple loops of inorganic barrier walls are formed with a process including: providing frit, wherein the frit comprises silicon oxide and a solvent, and applying screen printing to coat multiple loops of frit on the rigid base plate, followed by heating and curing to form the multiple loops of inorganic barrier walls.

5. The manufacturing method of the flexible OLED display panel as claimed in claim 1 , wherein in Step 2 , the organic material film comprises a polyimide film.

6. The manufacturing method of the flexible OLED display panel as claimed in claim 1 , wherein the flexible backings have a thickness that is less than a height of the inorganic barrier walls.

7. The manufacturing method of the flexible OLED display panel as claimed in claim 1 , wherein the water/oxygen barrier layers each have a surface area that is smaller than or substantially equal to a surface area of the flexible backings and also greater than a surface area of the OLED device layers and the thin-film transistor layers.

8. The manufacturing method of the flexible OLED display panel as claimed in claim 1 , wherein the water/oxygen barrier layers and the thin-film packaging layers each comprise a plurality of inorganic material layers and organic material layers arranged to stack on and alternate with each other.

9. The manufacturing method of the flexible OLED display panel as claimed in claim 8 , wherein the inorganic material layers are formed of a material comprising at least one of silicon oxide, silicon nitride, and silicon oxynitride; and the organic material layers are formed of a material comprising one or multiple ones of acrylic, hexamethyldisiloxane, polyacrylate, polycarbonate, and polystyrene.

10. The manufacturing method of the flexible OLED display panel as claimed in claim 1 , wherein the flexible OLED display panels each comprise: the flexible backing; the water/oxygen barrier layer, the thin-film transistor layer, and the OLED device layer that are stacked, in sequence from bottom to top, on the flexible backing; and a thin-film packaging layer arranged on the OLED device layer and the water/oxygen barrier layer, wherein the thin-film packaging layer encloses the OLED device layer and the thin-film transistor layer located thereunder.

11. A manufacturing method of a flexible organic light emitting display (OLED) panel, comprising the following steps:
Step 1 : providing a rigid base plate and forming multiple loops of inorganic barrier walls, which are spaced from each other, on the rigid base plate such that the multiple loops of inorganic barrier walls respectively and circumferentially enclose a plurality of panel areas on the rigid base plate;
Step 2 : coating an organic material film on the rigid base plate and the multiple loops of inorganic barrier walls, in a manner of covering the entirety of surface thereof, such that as being separated by the multiple loops of inorganic barrier walls, portions of the organic material film that are located on the plurality of panel areas of the rigid base plate respectively form a plurality of flexible backings;
Step 3 : forming a plurality of water/oxygen barrier layers respectively on the plurality of flexible backings, forming, in sequence from bottom to top, thin-film transistor layers and OLED device layers respectively on the plurality of water/oxygen barrier layers, and applying packaging to the thin-film transistor layers and the OLED device layers to form a plurality of thin-film packaging layers respectively on the OLED device layers and the water/oxygen barrier layers such that each of the thin-film packaging layers encloses the OLED device layer and the thin-film transistor layer located thereunder to thereby form a plurality of flexible OLED display panels, which are respectively located in the multiple loops of inorganic barrier walls, on the rigid base plate; and
Step 4 : applying laser lift off (LLO) technology to remove the plurality of flexible backings from the rigid base plate so as to obtain a plurality of flexible OLED display panels;
wherein the rigid base plate comprises a glass plate; and
wherein in Step 2 , the organic material film comprises a polyimide film.

12. The manufacturing method of the flexible OLED display panel as claimed in claim 11 , wherein the multiple loops of inorganic barrier walls are formed of a material comprising at least one of silicon oxide, silicon nitride, and silicon oxynitride.

13. The manufacturing method of the flexible OLED display panel as claimed in claim 12 , wherein the material of the multiple loops of inorganic barrier walls is silicon oxide, and the multiple loops of inorganic barrier walls are formed with a process including: providing frit, wherein the frit comprises silicon oxide and a solvent, and applying screen printing to coat multiple loops of frit on the rigid base plate, followed by heating and curing to form the multiple loops of inorganic barrier walls.

14. The manufacturing method of the flexible OLED display panel as claimed in claim 11 , wherein the flexible backings have a thickness that is less than a height of the inorganic barrier walls.

15. The manufacturing method of the flexible OLED display panel as claimed in claim 11 , wherein the water/

Assignees

• Wuhan China Star Optoelectronics Technology Co Ltd

Inventors

• Yu Wei

Classifications

• H01L51/5256

  Electricity · mapped topic

• H01L51/004

  Electricity · mapped topic

• H01L2251/566

  Electricity · mapped topic

• H01L51/0035

  Electricity · mapped topic

• H01L51/0097

  Electricity · mapped topic