Expanding the color gamut of thermochromic materials

Patent metadata

Field	Value
Publication number	US-11207907-B2
Application number	US-202017087368-A
Country	US
Kind code	B2
Filing date	Nov 2, 2020
Priority date	Dec 6, 2018
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

Formation of a multi-colored image in thermochromic material involves controlling operation of first, second, and third heat sources. The first heat source heats pixels of the thermochromic material to activate the pixels. The second and third heat sources are selectively controlled to heat different sets of pixels using neither, one, or both of the second and third heat sources.

First claim

The invention claimed is:

1. An article, comprising:
a substrate; and
a layer of thermochromic material disposed in or on the substrate, a color of one or more regions of the thermochromic material falling within a region of a standard CIE color chart above about 0.25 and below about 0.4 on the y-axis and above 0.2 and below about 0.5 on the x-axis.

2. The article of claim 1 , wherein the thermochromic material comprises a material capable of producing at least two colors.

3. The article of claim 1 , wherein the thermochromic material comprises a material capable of producing at least red and blue.

4. The article of claim 1 , wherein the thermochromic material comprises diacetylene.

5. The article of claim 1 , wherein the thermochromic material comprises one or more additives configured to one or both of control and assist in one or both of heat absorption and heat retention.

6. The article of claim 1 , wherein the thermochromic material comprises one or both of infrared (IR) radiation absorbers and near infrared (NIR) radiation absorbers configured to adjust a response of the thermochromic material to the radiation.

7. The article of claim 1 , wherein the layer of thermochromic material comprises:
one or more first regions that are substantially clear such that the substrate is visible through the thermochromic material at the one or more first regions; and
one or more second regions that include the color.

8. An article, comprising:
a substrate; and
a layer of thermochromic material disposed in or on the substrate, a color of one or more regions of the thermochromic material falling within a region of a standard CIE color chart bounded by a line expressed by the equation y>0.47x+0.08 and a line expressed by the equation y<0.47x+0.2.

9. The article of claim 8 , wherein the thermochromic material comprises a material capable of producing at least two colors.

10. The article of claim 8 , wherein the thermochromic material comprises a material capable of producing at least red and blue.

11. The article of claim 8 , wherein the thermochromic material comprises diacetylene.

12. The article of claim 8 , wherein the thermochromic material comprises one or more additives configured to one or both of control and assist in one or both of heat absorption and heat retention.

13. The article of claim 8 , wherein the thermochromic material comprises one or both of infrared (IR) radiation absorbers and near infrared (NIR) radiation absorbers configured to adjust a response of the thermochromic material to the radiation.

14. The article of claim 8 , wherein the layer of thermochromic material comprises:
one or more first regions that are substantially clear such that the substrate is visible through the thermochromic material at the one or more first regions; and
one or more second regions that include the color.

15. An article, comprising:
a substrate; and
a layer of thermochromic material disposed in or on the substrate, a color of one or more regions of the thermochromic material falling within:
a region of a standard CIE color chart above about 0.25 and below about 0.4 on the y-axis and above 0.2 and below about 0.5 on the x-axis; and
a region of a standard CIE color chart bounded by a line expressed by the equation y>0.47x+0.08 and a line expressed by the equation y<0.47x+0.2.

16. The article of claim 15 , wherein the thermochromic material comprises a material capable of producing at least two colors.

17. The article of claim 15 , wherein the thermochromic material comprises a material capable of producing at least red and blue.

18. The article of claim 15 , wherein the thermochromic material comprises diacetylene.

19. The article of claim 15 , wherein the thermochromic material comprises one or more additives configured to one or both of control and assist in one or both of heat absorption and heat retention.

20. The article of claim 15 , wherein the thermochromic material comprises one or both of infrared (IR) radiation absorbers and near infrared (NIR) radiation absorbers configured to adjust a response of the thermochromic material to the radiation.

21. The article of claim 15 , wherein the layer of thermochromic material comprises:
one or more first regions that are substantially clear such that the substrate is visible through the thermochromic material at the one or more first regions; and
one or more second regions that include the color.

Assignees

• Palo Alto Res Ct Inc

Inventors

• Pirmoradi Fatemeh Nazly
• Chua Christopher L
• Arakaki Kyle
• Chamoun Jacob N

Classifications

• B41M5/34 Primary

  Multicolour thermography · CPC title

• B41M5/282 Primary

  using thermochromic compounds · CPC title

• B41M7/0081

  using electromagnetic radiation or waves, e.g. ultraviolet radiation, electron beams · CPC title

• B41J2/32

  using thermal heads · CPC title