Patent ID: 9676335
Date: 2017-06-13
CPC Classifications: B60R,G02B

Claim:
1. A backlight unit for an outside mirror of a vehicle, the apparatus comprising: a glass including an etched portion at a front side of the glass and a mirror surface at a rear side of the glass, wherein the etched portion is etched with an indicator icon and configured to notice that an obstacle approaches to a driver; a bottom case attached to the rear side of the glass; a light source seated on an inner lower side of the bottom case and emitting light; a light guide plate positioned on an inner upper side of the bottom case and uniformly diffusing light emitted from the light source and transferring the light to a prism plate; the prism plate directly disposed in front of the light guide plate at the inner upper side of the bottom case and refracting and focusing light from the light guide plate to increase surface brightness; a diffuser sheet disposed in front of the prism plate; and a top case coupled to a front end of the bottom case, wherein the prism plate includes: a base layer; and a prism layer laminated on the base layer, wherein the base layer faces the light guide plate in the bottom case and the prism layer faces the diffuser sheet to increase the surface brightness of the backlight unit, wherein the emitted light is transferred to the rear side of the glass and emitted toward the mirror surface of the glass through the etched portion of the glass.