Patent ID: 8172444
Filing Date: 2012-05-08
Classification: H01H

Abstract:
1. A light guide display comprising: a printed overlay layer comprising an input region, wherein the input region comprises a symbol that is at least partially translucent through a thickness of the printed overlay layer; a first light guide layer disposed on a back side of the printed overlay layer, the first light guide layer to receive light and to distribute the light at least partially according to total internal reflection (TIR) to an illumination region aligned with the symbol of the printed overlay layer, wherein the first light guide layer is configured to illuminate the symbol of the printed overlay layer in response to illumination of the first light guide layer; a second light guide layer disposed on a front side of the printed overlay layer, opposite the first light guide layer, the second light guide layer comprising a separate symbol that is distinct from the symbol of the printed overlay layer, wherein the second light guide layer is configured to illuminate the separate symbol of the second light guide layer in response to illumination of the second light guide layer; and a first light curtain layer disposed between the printed overlay layer and the second light guide layer, around a perimeter of the printed overlay layer, wherein the first light curtain layer is configured to at least partially block light leakage from the first light guide layer and the printed overlay layer to the second light guide layer.