针对单反射面单波导板构型光栅设计与制造复杂的问题，提出一种L型单波导二维扩展构型。该构型由2个侧反射面和3块周期和条纹走向完全相同的全息光栅组成，用于降低光栅的设计制造难度。根据对构型光路的计算分析，该构型的转向光栅尺寸不超过40 mm×40 mm。仿真结果表明，该构型正确合理，且可以实现30°×30°的视场和30 mm的大出瞳显示，可用于增强现实显示或头戴式显示。

It is usually difficult to design and manufacture the gratings of single plate with single reflecting surface,thus we proposed a two-dimensional,L-shaped extended configuration with single plate.This configuration consists of two specular reflecting surfaces and three holographic gratings with the same period and groove orientation,which makes gratings design and fabrication easier.According to the calculation and analysis to the optical path of configuration,the size of the turning grating is no larger than 40 mm×40 mm.The simulation result demonstrates that the display configuration is reasonable and correct,and can realize the display effect with 30°×30° field of view and 30 mm large exit pupil.This configuration can be applied to an augmented reality display or a Head-Mounted Display (HMD).