Acta Optica Sinica, Volume. 32, Issue 10, 1005001(2012)
Design of Double-Layer Coupling Gratings for Full-Color Helmet Mounted Display
In the design of full-color waveguide holographic head-up display, the color is always uneven or the structure is over-complex. A novel double coupling grating structure is designed and optimized with embedded layers of different refractive indexes and thicknesses. Based on rigorous coupled-wave analysis (RCWA), the calculations show that the structure can achieve a more uniform color imaging in the primary field of view. It′s simplified and reliable for mass production. The double-grating is designed with central wavelength of 470 nm and 632 nm, respectively, to compensate the diffraction energy. After optimization, when the incident angle changes during the range from -11° to 11°, the diffraction efficiency (DE) of the RGB wavelengths is greater than 85% in the primary field of view and the maximum efficiency differs by less than 5%.
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You Meng, Huang Zhanhua, Cai Huaiyu. Design of Double-Layer Coupling Gratings for Full-Color Helmet Mounted Display[J]. Acta Optica Sinica, 2012, 32(10): 1005001
Category: Diffraction and Gratings
Received: Apr. 19, 2012
Accepted: --
Published Online: Sep. 17, 2012
The Author Email: Meng You (ymeng@tju.edu.cn)