Holographic retinal projection near-eye display with enhanced depth cues
Holographic retinal projection display(RPD)is one of the near eye displays that can alleviate vergence accommodation conflict(VAC)due to its large depth of field.However,an excessive depth of field(DOF)will cause a loss of depth cues whose image clarity does not vary with depth.To solve this problem,a band-limited random phase based holographic RPD is proposed by using the band-limited random phase to control the light beam width into the viewer's pupil.And the depth of field will be limited by the controlled beam width.Thus,the depth cue of defocus can be enhanced.The process of the band-limited random phase based RPD can be divided into three steps:Firstly,the band-limited random phase is calculated by the light beam width into the pupil and the depth of the target image.Secondly,the target image is multiplied by the spherical wave phase and the band-limited random phase.The hologram is obtained by a one-step Fresnel diffraction from the processed complex amplitude distribution in the target image plane.Lastly,the spatial light modulator loaded with the hologram is illuminated by the collimated laser light source.And the reconstructed object light converges on the pupil which achieves the depth cue enhanced RPD.The experiment verifies that the band-limited random phase based holographic RPD has the advantages of low scattering and high reproduction quality.And it can flexibly control the DOF of the target image and provide the observer with depth cues of focus blur.
3D displayholographic displayretinal projection displayband-limited random phase
国家科技期刊平台
NSTL
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