Dry box and control method thereof, and preparation method of organic electroluminescent device

Patent metadata

Field	Value
Publication number	US-11530874-B2
Application number	US-201916651567-A
Country	US
Kind code	B2
Filing date	Apr 3, 2019
Priority date	Jun 14, 2018
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

A dry box and a control method therefor, and a preparation method for an organic electroluminescent device are provided. The dry box includes a cavity and a hot plate arranged in the cavity. The hot plate includes a plurality of heating spots, the plurality of heating spots being arranged towards the hot plate to support a surface of a device to be dried, and some of the temperature of the plurality of heating spots being different and the heating spots being insulated from each other.

First claim

What is claimed is:

1. A dry box, comprising a cavity and a hot plate provided in the cavity,
wherein the hot plate comprises a plurality of heating spots, the plurality of heating spots being arranged towards the hot plate to support a surface of a device to be dried, and some of temperatures of the plurality of heating spots being different from each other and the heating spots being insulated from each other;
wherein the hot plate comprises a substrate and a plurality of independent heating sources arranged in array on the substrate, the substrate being made of a heat insulating material; and
the heating spots are respectively top portions of the heating sources on the hot plate, or points or regions respectively corresponding to orthographic projections of the heating sources on the hot plate.

2. The dry box according to claim 1 , wherein some of shapes of the orthographic projections of the plurality of heating sources on the substrate are different.

3. The dry box according to claim 1 , further comprising temperature controllers configured to adjust temperatures of the heating sources,
each of the temperature controllers being coupled to a corresponding heating source,
or,
the heating sources having a same shape of orthographic projections on the substrate being coupled to a same temperature controller.

4. The dry box according to claim 1 , wherein the dry box is configured to dry an organic electroluminescent device to be dried, and the plurality of heating sources on the substrate are divided into a plurality of groups, a cross-sectional shape of the plurality of the heating sources in each group perpendicular to a thickness direction of the substrate is same as a shape of a pattern to be dried in a plurality of subpixels in each pixel unit of the organic electroluminescent device to be dried respectively.

5. The dry box according to claim 4 , further comprising temperature controllers configured to adjust a temperature of the heating sources, the heating sources configured to heat subpixels emitting light of a same color being coupled to the same temperature controller.

6. The dry box according to claim 1 , wherein grooves are provided on the substrate, the heating sources are provided in the grooves, respectively, and the dry box further comprises a control member configured to control the heating sources to move up and down in a thickness direction of the substrate.

7. The dry box according to claim 3 , wherein each temperature controller is an electric heating structure provided with a thermocouple, each electric heating structures adjust outputting currents in real time according to a temperature fed back by a corresponding thermocouples.

8. A method of controlling a dry box, the dry box comprising a cavity and a hot plate provided in the cavity, wherein the hot plate comprising a plurality of heating spots, the plurality of heating spots being arranged towards the hot plate to support a surface of the device to be dried, and the plurality of heating spots having different temperatures from each other and are insulated from each other, the hot plate comprises a substrate and a plurality of independent heating sources arranged in array on the substrate, the substrate being made of a heat insulating material, and the heating spots are respectively top portions of the heating sources on the hot plate, or points or regions respectively corresponding to orthographic projections of the heating sources on the hot plate; the control method comprising:
controlling a heating temperature of each of the plurality of heating spots, such that each pattern to be dried in the device to be dried has a same evaporation rate in the dry box; and
controlling the movement of the heating sources, such that the heating sources moves in a direction away from the substrate.

9. A method of preparing an organic electroluminescent device by using a dry box, wherein the dry box comprises a cavity and a hot plate provided in the cavity, wherein the hot plate comprises a plurality of heating spots, the plurality of heating spots being arranged towards the hot plate to support a surface of a device to be dried, and some of the temperatures of the plurality of heating spots being different from each other and the heating spots being insulated from each other; the hot plate comprises a substrate and a plurality of independent heating sources arranged in array on the substrate, the substrate being made of a heat insulating material; and the heating spots are respectively top portions of the heating sources on the hot plate, or points or regions respectively corresponding to orthographic projections of the heating sources on the hot plate; wherein the method comprises:
providing a substrate;
forming a pattern to be dried of the organic electroluminescent device on the substrate; and
placing the substrate on which the pattern to be dried is formed on the hot plate of the dry box in an alignment manner for drying.

10. The method according to claim 9 , wherein the forming the pattern to be dried of the organic electroluminescent device on the substrate comprises:
forming a hole injection layer to be dried, a hole transport layer to be dried, and an electroluminescent layer to be dried on the substrate using a solution process.

11. The dry box according to claim 1 , further comprising temperature controllers configured to adjust temperatures of the heating sources,
each of the temperature controllers being coupled to a corresponding heating source,
or,
the heating sources having a same shape of orthographic projections on the substrate being coupled to a same temperature controller.

12. The dry box according to claim 11 , wherein the dry box is configured to dry an organic electroluminescent device to be dried, and the plurality of heating sources on the substrate are divided into a plurality of groups, a cross-sectional shape of the plurality of the heating sources in each group perpendicular to a thickness direction of the substrate is same as a shape of a pattern to be dried in a plurality of subpixels in each pixel unit of the organic electroluminescent device to be dried respectively.

13. The dry box according to claim 12 , further comprising temperature controllers configured to adjust a temperature of the heating sources, the heating sources configured to heat subpixels emitting light of a same color being coupled to a same temperature controller.

14. The dry box according to claim 13 , wherein grooves are provided on the substrate, the heating sources are provided in the grooves, respectively, and the dry box further comprises a control member configured to control the heating sources to move up and down in a thickness direction of the substrate.

15. The dry box according to claim 14 , wherein each temperature controller is an electric heating structure provided with a thermocouple, each electric heating structures adjust outputting currents in real time according to a temperature fed back by a corresponding thermocouple.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Hu Chunjing
• Hou Wenjun

Classifications

• F26B3/28

  by radiation, e.g. from the sun · CPC title

• F26B9/06 Primary

  in stationary drums or chambers · CPC title

• F26B3/18

  by conduction, i.e. the heat is conveyed from the heat source, e.g. gas flame, to the materials or objects to be dried by direct contact · CPC title

• F26B23/04 Primary

  using electric heating (F26B23/10 takes precedence) · CPC title

• H01L51/56

  Electricity · mapped topic