Device for making illuminated markings

A method for manufacturing a pressure-sensitive light-extracting device for making illuminating markings, the method comprising:

• fabricating a light guide plate having a first surface and an opposing second surface sufficient to establish total internal reflection within the light guide plate;
• optically coupling a light source with the light guide plate for illuminating the light guide plate with light at an angle of incidence relative to the first surface and the second surface, the angle of incidence being within a critical range of angles of incidence sufficient to promote total internal reflection of the light within the light guide plate;
• and
• mounting a film to the first surface of the light guide plate wherein the film and the light guide plate are separated by a layer of air, such that an application of pressure causes the film to bond with the light guide plate at a light-extracting point on the first surface of the light guide plate, wherein the bond between the film and the light guide plate alters the critical range of angles of incidence at the light-extracting point sufficient to extract total internally reflected light from the light guide plate and into the film at the light-extracting point.