Do you have any sources on that? The only thing I could find was that some parties want to ban digital billboard in the city of Zurich (not the whole canton).
In Geneva, the debate has been going on for some time. There, I think since 2021, digital billboards should be banned, but in the latest votes there is the counter-movement to keep the billboards [1].
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[0]: https://www.stadt-zuerich.ch/hbd/de/index/bewilligungen_und_...
[1]: https://www.swissinfo.ch/eng/politics/geneva-throws-out-ban-...