| 摘要 |
<p>A flexible-touch keypad (100) is backlit by an electroluminescent layer (118) that overlies an actuator layer (108) and a circuitry layer (102). The actuator layer (108) includes posts (112A) protruding through apertures (120) in the electroluminescent layer (118) and extending upward toward a translucent flexible surface layer (124). The flexible surface layer (124) is coated with an opaque layer (206), which is etched to form indicia (130). The protruding post (112A) is translucent and functions as a light pipe, directing light upward from the electroluminescent layer (118) and through the translucent surface layer (124) with a substantially uniform light intensity, the light being visible through the etched indicia (130). When a key (128A) on the surface layer (124) is depressed, a corresponding post (112A) is urged downward toward the circuitry layer (102). A conductive pill (116A) attached to the post (112A) contacts a switch area (104) on the circuitry layer (102), thereby completing a circuit. The actuator layer (108) provides tactile feedback when a key (128A) is depressed.</p> |
