For mobile devices, permanent image displays are very attractive. We present one: the Binem« display which is close to appear on the market. A first demonstrator was shown at SID" 97. An important research and development work has been made in the Paris-Sud University and in Nemoptic to increase the temperature domain and define industrial processes to realise mean size displays. The Binem uses two equal lower energy states of a chiral nematic liquid crystal. The molecules are oriented almost parallel to the cell plates by monostable surface treatments. One state (U) is uniform, the other (T), is twisted by 180°.To switch, a high field pulse orients the molecules on one of the plate perpendicular to it: the anchoring is broken. After the pulse, this state is unstable, the molecules on the plate will relax to the anchoring orientation. If they fall in one direction the U state builds, if they fall in the opposite direction the T state is realized. The fall time of the pulse and the pretilts on the two plates control this process. We explain the mechanism of switching by surface anchoring breaking and the obtained display performances.© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.