We propose a waveguide-based near-eye display featuring a dual-channel exit pupil expander, which is composed of an in-coupler, relay gratings, and an out-coupler. Unlike the conventional waveguide-based near-eye displays, whose field of views are usually non-split or partially split, our dual-channel exit pupil expander is able to evenly split the field of view into two halves. The greatest benefit of doing so is that the upper limit of field of view could be significantly increased. The design rules for all components, including the microdisplay, collimating lens, waveguide and gratings, have been studied. The refractive index and dimension of waveguide are identified as two factors that limit the field of view. In what follows, its key specifications are recapitulated. Field of view is 70° (diagonal), eye relief is 15 mm, exit pupil is 20 × 9 mm², modulation transfer function is above 0.591 at 30 cycle/degree, contrast ratio is 13, and distortion is 1.38%.

我们提出了一种基于波导的近眼显示器，该显示器具有双通道出射光瞳扩展器，该扩展器由输入耦合器，中继光栅和输出耦合器组成。与传统的基于波导的近眼显示器不同，后者的视场通常是不分裂的或部分分裂的，我们的双通道出射光瞳扩展器能够将视场均匀地分为两半。这样做的最大好处是可以大大提高视野的上限。研究了所有组件的设计规则，包括微显示器，准直透镜，波导和光栅。波导的折射率和尺寸被认为是限制视野的两个因素。接下来，概述其主要规格。视场角为70°（对角线），视线为15毫米，出瞳为20×9毫米^{如图2所示}，在30个循环/度下，调制传递函数大于0.591，对比率为13，并且畸变为1.38％。