VEHICLE LAMP WITH LIQUID CRYSTAL LAYER

摘要

A vehicle lamp includes a laser diode, a reflector, a diffraction element, a liquid crystal layer, a phosphor layer and a lens. The liquid crystal layer includes a first polarized sheet, a second polarized sheet and a plurality of pixels sandwiched between the first polarized sheet and the second polarized sheet. The pixels are selectively powered to obtain different light transmittable areas of the liquid crystal layer. Laser emitted from the laser diode is reflected by the reflector and diffracted by the diffraction element to form a rectangular pattern. The diffracted light partially passes through the liquid crystal layer to form a low beam when the light transmittable area is small, and the diffracted light totally passes through the liquid crystal layer to form a high beam when the light transmittable area is large.

主权项

1. A vehicle lamp comprising:
a light source emitting light; a diffraction element diffracting the light to form a pattern; and a liquid crystal layer switchable between a first state and a second state having a light transmittable area larger than that of the first state; wherein when the liquid crystal layer is switched to the first state, a part of the diffracted light transmits through the liquid crystal layer and another part of the diffracted light is blocked by the liquid crystal layer, thereby forming a low beam; and wherein when the liquid crystal layer is switched to the second state, the diffracted light passes through the liquid crystal layer, thereby forming a high beam.