科研之友
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摘要
In near-eye displays (NEDs), retinal projection display (RPD) is one kind of promising technology to alleviate the vergence-accommodation conflict (VAC) issue due to its always-in-focus feature. Viewpoint replication is widely used to enlarge the limited eyebox. However, the mismatch between viewpoint interval and eye pupil diameter will cause the inter-viewpoint cross talk when multiple viewpoints enter the pupil simultaneously. In this Letter, a holographic complementary viewpoint method is proposed to solve this cross talk problem. Instead of avoiding observing multiple viewpoint images simultaneously, it is designed that multi-ple complementary viewpoints jointly project the complete image on the retina without cross talk. To do this, the target image is segmented into multiple sub-images, each multiplied with a corresponding partial spherical phase to converge to a specific complementary viewpoint. A group of complementary viewpoint enter the eye pupil simultane-ously, and each viewpoint project a corresponding sub-image on a specific area of the retina and splice to a complete image. All of the complementary viewpoints are duplicated to an interlaced two-dimensional array to extend the eyebox in both horizontal and vertical directions. Optical experiment verifies that the proposed method could present smooth tran-sition between viewpoints to avoid both inter-viewpoint cross talk and blank image issues.
