The invention relates to a display device comprising LC panels arranged next to each other. The shell is an elongated open ended member that is tapered in length and is formed with a U shaped cross section, sized to receive the wedge in sliding engagement. Sensors are associated with each one of the keys of the screen plate through the opening in the tub wall and concealed from a visible surface of the tub, the sensors being triggered by electromagnetic radiations of a user across a respective one of the keys.