Humidity sensor, wireless device including the same, and methods of making and using the same

Patent metadata

Field	Value
Publication number	US-10115051-B2
Application number	US-201615226671-A
Country	US
Kind code	B2
Filing date	Aug 2, 2016
Priority date	Aug 6, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A tag or smart label including a humidity sensor, and methods of manufacturing and using the same, are disclosed. The tag or smart label includes a substrate or backplane with a battery or antenna, a humidity sensor, and an integrated circuit thereon. The integrated circuit is in electrical communication with the humidity sensor and the antenna or battery, and is configured to process a signal from the humidity sensor corresponding to the humidity level or value in the environment to be monitored, and provide or generate a signal that represents the humidity level/value. The humidity sensor includes first and second electrodes that are a predetermined distance apart, a humidity-sensitive material having one or more electrical, mechanical or chemical properties that vary as a function of the humidity level/value, and a water- and/or humidity-permeable membrane covering the humidity-sensitive material.

First claim

What is claimed is:

1. A tag or smart label, comprising:
a) a substrate or backplane with a battery or antenna thereon, said battery or antenna providing power to other components of said tag or smart label;
b) a humidity sensor directly or indirectly on said substrate or backplane, said humidity sensor comprising (i) first and second electrodes that are a predetermined distance apart, (ii) a humidity-sensitive material having one or more electrical, mechanical or chemical properties that vary as a function of said humidity level or value in an environment of said tag or smart label, and (iii) a water- and/or humidity-permeable membrane covering said humidity-sensitive material; and
c) an integrated circuit directly or indirectly on said substrate or backplane and in electrical communication with said humidity sensor and said antenna or battery, said integrated circuit configured to (i) process a first signal from said humidity sensor including data and/or information corresponding to an analog value of said humidity level or value in said environment, and (ii) provide or generate a second, digital signal that represents said analog value of said humidity level or value in said environment.

2. The tag or smart label of claim 1 , further comprising a plurality of traces electrically connecting said battery or antenna to said integrated circuit at a first set of terminals, and said humidity sensor to at least one terminal of a second set of terminals of said integrated circuit different from said first set of terminals.

3. The tag or smart label of claim 2 , comprising said battery, and further comprising a display electrically connected to said integrated circuit at a third set of terminals, and an on/off switch electrically connected to said integrated circuit at one or more fourth terminals of said integrated circuit.

4. The tag or smart label of claim 1 , further comprising a pouch that sealingly encloses said backplane and said integrated circuit, wherein said pouch further includes a first window or opening exposing said humidity sensor to said environment.

5. The tag or smart label of claim 4 , further comprising an adhesive that seals said pouch around said first window or opening to said backplane and/or a peripheral region of and/or around said humidity sensor.

6. The tag or smart label of claim 4 , wherein said pouch comprises or consists of a food-, drug- or tobacco-compatible material.

7. The tag or smart label of claim 1 , wherein said humidity-sensitive material has a conductance or resistivity that increases or decreases as said humidity level or value in said environment increases or decreases.

8. The tag or smart label of claim 1 , wherein said humidity sensor further comprises a second substrate supporting said first and second electrodes and said humidity-sensitive material, and said second substrate is affixed or adhered to said substrate or backplane.

9. The tag or smart label of claim 8 , wherein said humidity sensor further comprises (i) first and second base electrodes respectively electrically connected to said first and second electrodes, and (ii) first and second connection terminals respectively electrically connected to said first and second base electrodes, wherein said first and second connection terminals are electrically connected to traces to said integrated circuit.

10. The tag or smart label of claim 1 , wherein said integrated circuit further comprises a second sensor selected from the group consisting of a temperature sensor, one or more continuity sensors, one or more electromagnetic field sensors, one or more current sensors, one or more voltage sensors, one or more power sensors, one or more light sensors, one or more time sensors, and one or more other chemical sensors.

11. The tag or smart label of claim 1 , wherein said integrated circuit further comprises a memory configured to store a value corresponding to said humidity level and/or a unique identification code for said container or package.

12. The tag or smart label of claim 1 , wherein said substrate or backplane (i) comprises or functions as a gas barrier and (ii) comprises or consists of a food-, drug- or tobacco-compatible polymer.

13. A method of manufacturing a tag or smart label, comprising:
a) forming at least one of a battery and an antenna on a substrate or backplane, said at least one of said battery and said antenna providing power to other components of said tag or smart label;
b) forming a humidity sensor directly or indirectly on said substrate or backplane, said humidity sensor comprising (i) first and second electrodes that are a predetermined distance apart, (ii) a humidity-sensitive material having one or more electrical, mechanical or chemical properties that vary as a function of said humidity level or value in an environment of said tag or smart label, and (iii) a water- and/or humidity-permeable membrane covering said humidity-sensitive material; and
c) forming an integrated circuit directly or indirectly on said substrate or backplane and in electrical communication with said humidity sensor and said at least one of said antenna and said battery, said integrated circuit configured to (i) process a first signal from said humidity sensor including data and/or information corresponding to an analog value of said humidity level or value in said environment, and (ii) provide or generate a second, digital signal that represents said analog value of said humidity level or value in said environment.

14. The method of claim 13 , further comprising forming a plurality of traces on said substrate or backplane, said traces electrically connecting said integrated circuit to said humidity sensor and to said at least one of said antenna and said battery.

15. The method of claim 13 , wherein forming said humidity sensor comprises (i) forming said first and second electrodes on a second substrate, (ii) printing said humidity-sensitive material over and between said first and second electrodes, and (iii) forming said water- and/or humidity-permeable membrane on or over said humidity-sensitive material.

16. The method of claim 13 , wherein forming said humidity sensor comprises (i) forming said first electrode on a second substrate, (ii) printing said humidity-sensitive material on or over said first electrode, (iii) forming said second electrode on or over said humidity-sensitive material, and (iv) forming said water- and/or humidity-permeable membrane on or over said humidity-sensitive material.

17. The method of claim 13 , further comprising placing or inserting said tag or smart label into a pouch, then sealing or enclosing said pouch, said pouch including a first window or opening exposing said humidity sensor to said environment.

18. A method of determining a humidity level in an environment inside or outside a package or container, comprising:
a) placing a tag or smart label on an inner or outer surface of said package or container or of packaging around said package or container, said tag or smart label comprising:
i) a substrate or backplane with a battery or antenna thereon, said battery or antenna providing power to other components of said tag or smart label;
ii) a humidity sensor directly or indirectly on said substrate or backplane, said humidity sensor comprising (i) first and second electrodes that are a predetermined distance apart, (ii) a humidity-sensitive material having one or more electrical, mechanical or chemical properties that vary as a function of said humidity level or value in an environment of said tag or smart label, and (iii) a water-

Assignees

• Takashima Mao
• Chandra Aditi
• Thin Film Electronics Asa

Inventors

• Takashima Mao
• Chandra Aditi

Classifications

• G06K19/0702

  the arrangement including a battery · CPC title

• G06K19/07779 Primary

  the inductive antenna being a coil · CPC title

• G06K19/0717

  the sensor being capable of sensing environmental conditions such as temperature history or pressure · CPC title