Large-viewing-angle integral imaging 3D display device based on secondary light field modulation

A large-viewing-angle integral imaging 3D display device based on secondary light field modulation, wherein the device comprises a 2D display screen, a light field guiding layer and a light field reconstruction layer, the 2D display screen is located at a bottom layer of the device, and the light field guiding layer and the light field reconstruction layer are located above sequentially;

• the 2D display screen is configured to display an interleaved coded elemental image array and provide an interleaved light field with different viewing area information for an upper structure of the device;
• the light field guiding layer is a micro-lens array and configured to modulate light emitted from the 2D display screen and guide and separate the interleaved light field with different viewing area information in space;
• the light field reconstruction layer is a large lens array, and is formed by arranging a plurality of large lenses with the same parameters, which is configured to receive separated light beams modulated by the light field guiding layer and perform the secondary light field modulation on the light emitted from the 2D display screen;
• the separated light beams in the n directions generated by the light field guiding layer are respectively irradiated to n adjacent large lenses, and at the same time, each large lens is irradiated by the separated light beams refracted by
• m
• n
• adjacent micro-lenses;
• it is ensured that a parameter
• m
• n
• is designed to be an integer;
• each large lens refracts and converges the separated light beams to form n adjacent separated viewing areas, and the n separated viewing areas can be merged into a complete viewing area by adjusting 3D content of the n separated viewing areas;
• a visual angle θ of the complete viewing area can be calculated based on the formula
• θ
• =
• 2
• ⁢
• arctan
• ⁢
• (
• mnp
• d
• 2
• ⁢
• d
• )
• ,
• wherein pd is a sub-pixel width of the 2D display screen, and d is a distance between the light field guiding layer and the light field reconstruction layer;
• the light field guiding layer reconstructs the separated light beams from different directions into separated viewing areas respectively, and merge the separated viewing areas simultaneously to achieve expansion of a 3D viewing angle;
• in order to ensure that the light field information of different separated viewing areas can be accurately separated and reconstructed, parameters of the sub-pixels, the light field guiding layer and the light field reconstruction layer need to meet the requirements of the formulas
• d
• d
• +
• f
• l
• =
• np
• d
• p
• l
• ⁢
• and
• ⁢
• Q
• L
• d
• =
• p
• d
• f
• l
• ,
• wherein fl and pl are a focal length and pitch of the light field guiding layer, and QL isa pitch of the light field reconstruction layer;
• and the distance d between the light field guiding layer and the light field reconstruction layer is not less than
• f
• l
• ⁢
• p
• l
• p
• d
• ,
• to ensure that the separated light beams irradiating the same large lens can completely overlap.