See-through computer display systems

A head mounted display with improved high transmission see-through view of the surrounding environment with an overlaid high contrast displayed image comprising:

• a. upper optics with a first optical axis including:
• i. an emissive image source that provides image light comprised of one or more narrow spectral bands of light;
• ii. one or more lenses;
• iii. a stray light trap;
• and
• b. non-polarized lower optics with a second optical axis including:
• i. a planar beam splitter angled relative to the first and second optical axes;
• and
• ii. a curved partially reflective mirror;
• wherein one or more of the reflective surfaces are treated to reflect a majority of incident light within the one or more narrow spectral bands and transmit a majority of incident visible light from the surrounding environment.