Abstract
An optical design for a see-through head-mounted display with high visibility is described. This design, which is based on a light guide plate with triangular microstructures, can overcome the limitations of the balance in optical efficiency. The optical efficiency of the virtual image can be larger than the optical efficiency of the real image, which ensures high visibility. The visibility can be increased to 22 with this design, much higher than the visibility possible with previous designs for a see-through head-mounted display, making this suitable for daily application.
Highlights
In the past few years, head-mounted displays (HMDs) have undergone rapid development [1]
See-through HMD systems have the capability of superimposing the virtual image on the real world scene and allow the users see the virtual image of the digital information and real world scene simultaneously [3]
Hung et al [12] described a light guide plate with microstructures to extract virtual image rays by total internal reflection (TIR) in their see-through HMD design which can increase the optical efficiency of the virtual image
Summary
In the past few years, head-mounted displays (HMDs) have undergone rapid development [1]. A semi-reflective coating is usually applied in the see-through HMD to extract the image rays This increases the cost and results in large energy loss of the virtual image because of the low transmittance. Hung et al [12] described a light guide plate with microstructures to extract virtual image rays by TIR in their see-through HMD design which can increase the optical efficiency of the virtual image. In order to solve these problems, we present a new optical design for a see-through HMD This new design is based on a light guide plate with triangular microstructures. There are two materials in the image output region of the light guide plate This design allows for extraction of the rays by TIR and improves the manufacturability. The maximum visibility obtained in previous designs was 1 [12], but the visibility range can be raised to 22 with this optical design, offering higher visibility for daily applications
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