1. Diffraction optics, micro-nano structure is changeable; The degree of freedom of grating combination is high (HL2)
2. Double-axis pupil dilation, which can realize large viewing angle, exit pupil size and appropriate eye distance;
3. High transparency and lightweight structure
It's tempting for everyone to see it, isn't it? Then let's talk about their difficulties.
1. The first is patent authorization, including Nokia, Magic Leap and Displex Oy.
2. The technical threshold is high, the structure is complex, and the processing is extremely difficult (it is difficult to achieve in China)
3. Lithography technology keeps the cost high (HL1&; 2)
Patent holder of array optical waveguide: Lumus, Israel
Advantages:
1. Geometric optics, simple principle.
2. Single chip color realization
Disadvantages:
1. Uniaxial pupil expansion with small exit pupil.
2. The form is fixed, the degree of freedom of optimization is low, and the angle of view is difficult to increase.
3. The yield is low, the investment is large, the cost is high, and it is difficult to enter the consumer electronics market.