The diffraction efficiency was analyzed in reflection type Hologram by use of Kogelnik's two coupled wave theory. The relationship among the diffraction efficiency, objective and reference light angles was investigated in consideration of the influence of the surrounding medium of hologram. As the result, it turns out that the surrounding medium and reference light angle have an effect on the diffraction efficiency. For example, we prepare the hologram sample that attached to glass substrate. Reference light is incident toward hologram through glass. Although the diffraction efficiency of hologram (n= 1.63) with 8 micron thickness is less than 40% on the reference light incident condition from perpendicular direction, the diffraction efficiency become more than 80% on the reference light incident condition from glass edge. This means that we can realize hologram having high diffraction efficiency even if the hologram film is thin. This suggests that edge illumination is effective in using reflective hologram and have merit on manufacturing process, even if the hologram film is thin.
Auto-stereoscopic 21-inch display with eye tracking having wide viewing zone and bright image was fabricated. The image of display is projected to retinal through several optical components. We calculated optical system for wider viewing zone by using Inverse-Ray Trace Method. The viewing zone of first model is 155mm (theoretical value: 161mm). We could widen viewing zone by controlling paraxial radius of curvature of spherical mirror, the distance between lenses and so on. The viewing zone of second model is 208mm. We used two spherical mirrors to obtain twice brightness. We applied eye-tracking system to the display system. Eye recognition is based on neural network card based on ZICS technology. We fabricated Auto-stereoscopic 21-inch display with eye tracking. We measured viewing zone based on illumination area. The viewing zone was 206mm, which was close to theoretical value. We could get twice brightness also. We could see 3D image according to position without headgear.
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