73395cb5-5b32-460b-abc6-4e687ca2fbb7
prompter
Is there any material available that can quickly change its colour depending on some current applied to it? I want to build a display that does not emit light itself.
191ad2e9-e9a7-4f25-893e-cb918cc6d06f
73395cb5-5b32-460b-abc6-4e687ca2fbb7
assistant
Yes, there are plenty of materials that change their colour when a current is applied to them, they are known as 'Electrochromic Materials'. Commonly, electrochromic materials are metal oxides, and have the ability to change, remove or heighten their colour when a current passes through them. 

This technology is already used in cars, mirrors and windows, and should work well with your display idea.
b7db777a-ec56-431b-a7b4-8819eda7e221
191ad2e9-e9a7-4f25-893e-cb918cc6d06f
prompter
thanks for the info! do you know what is the general price range of these materials?
c952f067-43d6-4ee5-b47d-8af399fe2afe
b7db777a-ec56-431b-a7b4-8819eda7e221
assistant
The cost can differ alot, but you could calculate with about 60USD per square meter.