Encapsulation of components of electronic device using halftoning to control thickness

Patent metadata

Field	Value
Publication number	US-9496519-B2
Application number	US-201514627186-A
Country	US
Kind code	B2
Filing date	Feb 20, 2015
Priority date	Dec 12, 2013
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

An ink jet process is used to deposit a material layer to a desired thickness. Layout data is converted to per-cell grayscale values, each representing ink volume to be locally delivered. The grayscale values are used to generate a halftone pattern to deliver variable ink volume (and thickness) to the substrate. The halftoning provides for a relatively continuous layer (e.g., without unintended gaps or holes) while providing for variable volume and, thus, contributes to variable ink/material buildup to achieve desired thickness. The ink is jetted as liquid or aerosol that suspends material used to form the material layer, for example, an organic material used to form an encapsulation layer for a flat panel device. The deposited layer is then cured or otherwise finished to complete the process.

First claim

What is claimed is:

1. A method of fabricating an electronic device, the method comprising:
receiving a substrate supporting components of the electronic device;
receiving electronic data identifying a desired thickness of a layer to encapsulate the components relative to the substrate;
using an ink-jet printing mechanism to deposit a material onto the components and substrate; and
employing a process to harden the deposited material to form the layer;
wherein the method further comprises converting the electronic data identifying the desired thickness to a halftone pattern, the halftone pattern selected according to a process in which a baseline droplets density in which adjacent droplets combine to provide gapless coverage is scaled to produce the desired thickness of the layer, and wherein using the ink-jet printing mechanism to deposit the material comprises jetting the material onto the components and substrate using the selected halftone pattern.

2. The method of claim 1 , wherein the electronic data includes at least one thickness value, wherein converting the electronic data includes converting the at least one thickness value to a grayscale value for each one of plural print cells, and wherein the halftone pattern is selected dependent on the grayscale values for the plural print cells.

3. The method of claim 2 , wherein using the selected halftone pattern further comprises selectively adjusting the grayscale value for at least one of the plural print cells.

4. The method of claim 3 , wherein selectively adjusting the grayscale value for at least one of the plural print cells includes doing so dependent on proximity to an edge of the encapsulation layer.

5. The method of claim 1 , wherein converting includes dividing a substrate deposition area into plural deposition regions and selecting a halftone pattern for each of the plural deposition regions, and wherein the halftone patterns for adjacent ones of the plural deposition regions are selected to have complementary droplet patterns.

6. The method of claim 1 , wherein using the ink-jet printing mechanism includes jetting substantially like-sized droplets of a liquid at variable spatial frequency selected to influence the desired thickness.

7. The method of claim 1 , wherein the material includes at least one of a liquid monomer, a liquid polymer or a solvent having an organic material suspended therein.

8. The method of claim 7 , wherein employing the process includes using an ultraviolet cure process to harden the at least one of the monomer, liquid polymer or solvent having an organic material suspended therein.

9. The method of claim 1 , embodied as a method of fabricating a flat panel television.

10. The method of claim 1 , embodied as a method of fabricating a solar panel.

11. A method of fabricating an electronic device, the method comprising:
receiving a substrate supporting components of the electronic device;
receiving electronic data identifying a desired thickness of a layer to encapsulate the components relative to the substrate;
using an ink-jet printing mechanism to deposit, within a controlled atmosphere, a material over the components and substrate; and
employing a process to harden the deposited material to form the layer;
wherein the method further comprises converting the electronic data identifying the desired thickness to a halftone pattern, the halftone pattern selected according to a process in which a baseline droplets density in which adjacent droplets combine to provide gapless coverage is scaled to produce the desired thickness of the layer, and wherein using the ink-jet printing mechanism to deposit the material comprises jetting the material onto the components and substrate using the selected halftone pattern.

12. The method of claim 11 , wherein:
wherein the material includes at least one of a liquid monomer, a liquid polymer or a solvent having an organic material suspended therein;
employing the process includes using an ultraviolet cure process to harden the at least one of a liquid monomer, a liquid polymer or a solvent having an organic material suspended therein;
using the ink-jet printing mechanism and using the ultraviolet cure process are each performed in respective chambers, each of the respective chambers having a controlled atmosphere;
the controlled atmosphere for at least one of the respective chambers includes one of an atmosphere that is primarily composed of nitrogen and an atmosphere that is primarily composed of a noble gas; and
the method further comprises transporting the substrate between the respective chambers in a manner uninterrupted by exposure to an uncontrolled atmosphere.

13. The method of claim 12 , embodied as a method of fabricating a flat panel television.

14. The method of claim 12 , wherein the electronic data includes at least one thickness value, wherein converting the electronic data includes converting the at least one thickness value to a grayscale value for each one of plural print cells, and wherein the halftone pattern is selected dependent on the grayscale values for the plural print cells.

15. A method of fabricating an electronic device, the method comprising:
receiving a substrate supporting components of the electronic device;
receiving electronic data identifying a desired thickness of a layer to encapsulate the components relative to the substrate;
generating a grayscale value for each of plural print cells based on the received electronic data, each print cell corresponding to a different region of the substrate;
using an ink-jet printing mechanism to deposit a material over the components and substrate to form the layer; and
employing a process to harden the deposited material to form the encapsulation layer;
wherein the method further comprises converting the grayscale values to at least one halftone pattern, each halftone pattern selected to produce desired thickness of the layer for a corresponding portion of the substrate, and wherein using the ink-jet printing mechanism to deposit the material comprises jetting the material onto the components and substrate using the at least one selected halftone pattern.

16. The method of claim 15 , wherein using the selected halftone pattern further comprises selectively adjusting the grayscale value for one of the print cells in dependence on height of a corresponding one of the components.

17. The method of claim 15 , wherein using the selected halftone pattern further comprises selectively adjusting the grayscale value for one of the print cells in dependence on proximity to an edge of the encapsulation layer.

18. The method of claim 15 , wherein using the ink-jet printing mechanism includes jetting substantially like-sized droplets of a liquid at variable spatial frequency selected to influence the desired thickness.

19. The method of claim 15 , wherein the material includes at least one of a liquid monomer, a liquid polymer or a solvent having an organic material suspended therein, and wherein employing the process includes using an ultraviolet cure process to harden the deposited one of the monomer, liquid polymer or solvent having an organic material suspended there.

20. The method of claim 19 , wherein:
using the ink-jet printing mechanism and using the ultraviolet cure process are each performed in respective chambers, each of the respective chambers having a controlled atmosphere; and
the controlled atmosphere for at least one of the respective chambers includes one of an atmosphere that is primarily co

Assignees

• Kateeva Inc

Inventors

• Vronsky Eliyahu
• Harjee Nahid

Classifications

• H10P74/238

  comprising acting in response to an ongoing measurement without interruption of processing, e.g. endpoint detection or in-situ thickness measurement · CPC title

• H10P74/203

  Structural properties, e.g. testing or measuring thicknesses, line widths, warpage, bond strengths or physical defects · CPC title

• H10P72/0441

  Apparatus for sealing, encapsulating, glassing, decapsulating or the like · CPC title

• H10P14/6346

  using printing, e.g. ink-jet printing · CPC title

• B41J2/21

  for multi-colour printing · CPC title