Mr. Tatsuya Hasegawa Profile

Tatsuya Hasegawa

at Nagaoka Univ of Technology

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Proceedings Article | 17 March 2015 Paper

Reduce blurring and distortion in a projection type virtual image display using integrated small optics

Tatsuya Hasegawa, Tomohiro Yendo

Proceedings Volume 9392, 93920P (2015) https://doi.org/10.1117/12.2183173

KEYWORDS: Distortion, Heads up displays, Projection systems, Image compression, Image display, Integrated optics, Beam splitters, Cameras, Roads, Augmented reality

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Head Up Display (HUD) is being applied to automobile. HUD displays information as far virtual image on the windshield. Existing HUD usually displays planar information. If the image corresponding to scenery on the road like Augmented Reality (AR) is displayed on the HUD, driver can efficiently get the information. To actualize this, HUD covering large viewing field is needed. However existing HUD cannot cover large viewing field. Therefore we have proposed system consisting of projector and many small diameter convex lenses. However observed virtual image has blurring and distortion . In this paper, we propose two methods to reduce blurring and distortion of images. First, to reduce blurring of images, distance between each of screen and lens comprised in lens array is adjusted. We inferred from the more distant the lens from center of the array is more blurred that the cause of blurring is curvature of field of lens in the array. Second, to avoid distortion of images, each lens in the array is curved spherically. We inferred from the more distant the lens from center of the array is more distorted that the cause of distortion is incident angle of ray. We confirmed effectiveness of both methods.

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