| abstract |
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. |