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Touch displays without the use of rare earth elements

06.01.2014

3M plans to start manufacturing touch screens based on silver nanowires in 2014.

The technology for the production of silver nanowires was developed by Cambrios Technologies. In the production of touch panels from nanowires, a thin electrically conductive layer will be formed. Previously, such a layer was made from a mixture of oxides of tin (10%) and indium (90% by weight). Compared to a mixture of indium and tin oxides, silver has better characteristics, and, in addition, is a more affordable material. To date, as the press service of 3M emphasizes, several designs of touch displays have already been patented for various devices, from full-size monitors to mobile phones.

One of the main advantages of silver nanowires is their flexibility. In addition, displays made with this material have shown high transparency (89%), which the company claims will enable higher contrast screens. The flexibility of the silver substrate will also allow the creation of curved displays. Moreover, there may be displays that can be rolled up. Next year, it is planned to increase the production volume to 600 thousand square meters. meters of touch screens per month.

Indium is a rare earth metal that is produced in the amount of about 700 tons per year, more than half of which is mined in China. At the same time, almost 30 times more silver is mined in the world every year, and its reserves in the earth's crust are estimated to be higher.

According to forecasts made at the beginning of 2010, indium should actually run out by the end of the decade: existing deposits will run out, and technologists will have to look for an alternative to this element, or develop new sources of it. In addition to silver, carbon nanotubes are also called an alternative to indium.

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The Bloomberg NEF forecast states that the pace of sales of electric models will grow rapidly and by the mid-2030s, electric vehicles will surpass ICE models in sales, and by 2040 they will occupy about 57% of the sales market.

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