Transparent heating device with graphene film

Patent metadata

Field	Value
Publication number	US-10660159-B2
Application number	US-201515521888-A
Country	US
Kind code	B2
Filing date	Oct 23, 2015
Priority date	Oct 24, 2014
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

The invention concerns a transparent heating device comprising: a graphene film fixed to a transparent substrate; a first electrode ( 205 ) connected to a first edge of the graphene film; and a second electrode ( 206 ) connected to a second edge of the graphene film, wherein there is a resistance gradient across the graphene film from the first electrode ( 205 ) to the second electrode ( 206 ).

First claim

The invention claimed is:

1. A transparent heating device comprising:
a graphene film fixed to a transparent substrate;
a first electrode connected to a first edge of the graphene film; and
a second electrode connected to a second edge of the graphene film, wherein there is a resistance gradient across the graphene film from the first electrode to the second electrode, the graphene film comprising a first region adjacent to the first electrode and at least one further region, the first region being adapted to have a lower resistance per square than each of the at least one further regions, the graphene film comprising areas of reduced thickness and/or absence of graphene, the lower resistance per square in the first region with respect to the at least one further region resulting from the surface area and/or thickness of said areas of reduced thickness and/or absence of graphene.

2. The transparent heating device of claim 1 , wherein the areas of reduced thickness and/or absence of graphene comprise openings formed in one or more graphene mono-layers of the graphene film in the at least one further region.

3. The transparent heating device of claim 2 , wherein the first region comprises openings formed in one or more graphene mono-layers of the graphene film, and wherein the density of openings and/or the surface area of the openings is greater in the at least one further region than in the first region.

4. The transparent heating device of claim 3 , wherein the first region comprises a plurality of graphene mono-layers, and wherein the at least one further region comprises fewer graphene mono-layers than the first region.

5. The transparent heating device of claim 2 , wherein the first region comprises a plurality of graphene mono-layers, and wherein the at least one further region comprises fewer graphene mono-layers than the first region.

6. The transparent heating device of claim 1 , wherein the first region comprises a plurality of graphene mono-layers, and wherein the at least one further region comprises fewer graphene mono-layers than the first region.

7. The transparent heating device of claim 1 , further comprising a display comprising one or more light emitting elements each having a pair of electrodes, wherein the graphene film forms one of the pair of electrodes of each light emitting element.

8. A transparent heating device comprising:
a graphene film fixed to a transparent substrate;
a first electrode connected to a first edge of the graphene film;
a second electrode connected to a second edge of the graphene film, wherein there is a resistance gradient across the graphene film from the first electrode to the second electrode, the graphene film comprising a first region adjacent to the first electrode and at least one further region, the first region being adapted to have a lower resistance per square than each of the at least one further regions; and
one or more gate electrodes positioned in the at least one further regions and isolated from the graphene film by an insulating layer, a voltage applied to the one or more gate electrodes increasing the resistance per square of the graphene film in the at least one further regions.

9. The transparent heating device of claim 8 , wherein each of the one or more gate electrodes has a surface area of at least 1 cm 2 .

10. The transparent heating device of claim 8 , comprising a plurality of said further regions, a first of said gate electrodes being positioned in a first of said further regions and a second of said gate electrodes being positioned in a second of said further regions.

11. The transparent heating device of claim 10 , further comprising a control circuit adapted to apply a first voltage to the first gate electrode and a second voltage different from the first voltage to the second gate electrode.

12. The transparent heating device of claim 8 , further comprising a display comprising one or more light emitting elements each having a pair of electrodes, wherein the graphene film forms one of the pair of electrodes of each light emitting element.

13. A transparent heating and display device comprising:
a transparent heating element formed of a graphene film fixed to a transparent substrate;
a plurality of light-emitting elements each comprising a pair of electrodes, wherein said graphene film forms one of the pair of electrodes of each of the light emitting elements;
a first electrode connected to a first edge of the graphene film; and
a second electrode connected to a second edge of the graphene film,
wherein there is a resistance gradient across the graphene film from the first electrode to the second electrode, the graphene film comprising a first region adjacent to the first electrode and at least one further region, the first region being adapted to have a lower resistance per square than each of the at least one further regions, and wherein,
the graphene film comprising areas of reduced thickness and/or absence of graphene, the lower resistance per square in the first region with respect to the at least one further region resulting from the surface area and/or thickness of said areas of reduced thickness and/or absence of graphene, or
one or more gate electrodes are positioned in the at least one further regions and isolated from the graphene film by an insulating layer, a voltage applied to the one or more gate electrodes increasing the resistance per square of the graphene film in the at least one further regions.

14. The transparent heating and display device of claim 13 , wherein the plurality of light-emitting elements are organic light-emitting diodes, and wherein the graphene film directly contacts an organic layer of each of the organic light-emitting diodes.

15. The transparent heating and display device of claim 14 , further comprising:
a first electrode connected to a first edge of the graphene film; and
a second electrode connected to a second edge of the graphene film, wherein there is a resistance gradient across the graphene film from the first electrode to the second electrode.

16. The transparent heating and display device of claim 13 , wherein the other of the pair of electrodes of each light-emitting element is coupled via a corresponding conducting track to a control circuit.

17. The transparent heating and display device of claim 16 , further comprising:
a first electrode connected to a first edge of the graphene film;
a second electrode connected to a second edge of the graphene film,
wherein a first of the plurality of light-emitting elements is positioned at a first distance from the first electrode and a second of the plurality of light-emitting elements is positioned at a second distance from the first electrode, wherein the control circuit is adapted to generate a first voltage signal (VA) for activating the first light-emitting element and a second voltage signal (VB) for activating the second light-emitting element (B), the levels of the first and second voltage signals being selected based on the first and second distances.

18. The transparent heating and display device of claim 13 , wherein at least one of the light-emitting elements is an organic light-emitting diode.

19. A method comprising:
forming a transparent heating device comprising a graphene film;
forming a plurality of light-emitting elements, each light-emitting element having a pair of electrodes, wherein the graphene film forms one of the pair of electrodes of each light-emitting element; and
forming a first electrode connected to a first edge of the

Assignees

• Centre Nat Rech Scient
• Univ Grenoble Alpes

Inventors

• Bouchiat Vincent
• Marty Laetitia
• Bendiab Nedjma

Classifications

• H05B3/145 Primary

  Carbon only, e.g. carbon black, graphite · CPC title

• H05B2203/011

  Heaters using laterally extending conductive material as connecting means · CPC title

• H05B2203/017

  Manufacturing methods or apparatus for heaters · CPC title

• H05B2214/04

  Heating means manufactured by using nanotechnology · CPC title

• H05B3/84 Primary

  Heating arrangements specially adapted for transparent or reflecting areas, e.g. for demisting or de-icing windows, mirrors or vehicle windshields · CPC title