Dual-element Off-axis Eyeglass-Based Display
نویسندگان
چکیده
Eyeglass-based displays are expected to become a primary visual display option for future wearable computing platforms. There has been several prototypes in the area of eyeglass-based displays. Example of previous designs include the work by Bettinger[1], Spitzer[2] and Kasai[3]. A comprehensive review of designs in the eyeglass formfactor is provided in [4]. In this paper, we explore the possibilities in terms of minimizing the optical element count, having an acceptable exit pupil size and field of view, while having the system operating throughout the photopic visible spectrum. We are focusing on alternatives to holographic optical elements or total internal reflection based waveguiding techniques which also have a potential to be adapted to eyeglass-based displays. A key to low element count is the exploitation of higher degrees of freedom surface shapes for both optical elements while keeping fabrication and design sensitivity limitations in mind. The design presented in this paper is based on a 12-th order aspheric lens with a diffractive optical element and an X-Y polynomial mirror to 4-th degree.
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