Patent ID: 7876308

Claim:
A display device, a surface of the device being rendered touch-sensitive, the device comprising: a first dedicated part having two insulating plates; a layer of material exhibiting electro-optical properties suitable for rendering all or part of a surface of the layer of material visible under the effect of an electrical control signal, the layer being disposed between inner faces of the two insulating plates; at least one first electrode having a shape of a pictogram, the at least one first electrode being disposed on the inner face of one of the insulating plates; a touch sensor comprising a second electrode disposed on the inner face of the other insulating plate opposite the at least one first electrode, wherein the electrical control signal is applied between the at least one first electrode and the second electrode, and a touch sensor signal distinct from the electrical control signal is also applied to the second electrode, the touch sensor signal is configured to enable proximity detection of a finger by capacitive effect; a surface area of the second electrode is at least 9 mm 2 , and the surface area of the second electrode is greater than or equal to the surface area or the sum of the surface areas of the at least one first electrode.