The invention discloses a planar 
waveguide imaging device and method. The device comprises a lighting source, an optical 
grating film, an image source, an 
optical alignment system, an optical 
wave coupling input surface, a planar 
waveguide substrate and optical 
wave coupling output surfaces, wherein the lighting source is used for emitting optical 
waves distributed in the exponential order, the optical 
grating film is used for reflecting the optical 
waves emitted by the lighting source, the image source is used for modulating the optical 
waves reflected by the optical 
grating film, the modulated optical waves can be transmitted through the optical grating film, the 
optical alignment system is used for alignment of the optical waves transmitted by the optical grating film, the optical 
wave coupling input surface is used for 
coupling the aligned optical waves into a planar 
waveguide, the planar waveguide substrate is used for conducting reflection propagation on the input coupled optical waves to form total reflection optical waves, and the optical wave 
coupling output surfaces are used for expanding the view field and outputting the coupled optical waves out of the planar waveguide substrate. The device and method can improve the luminance uniformity of output images of a wearable waveguide, and designing and 
machining difficulty is reduced.