In recent years, head-mounted display systems tend to develop into planar see-through display which is much smaller and lighter. Considering ghost images in planar display based on transparent film array with 45° inclination, a novel improved structure is proposed. By reducing inclination of films, the inclinations of different Field of View (FOV) in the waveguide increase, which means exit-pupil can be extended. In such case, beams that may cause ghost images also change their propagating paths. At the same time, dual-layer waveguide which has a filmed layer and a non-filmed layer can constrain conditions of ghost images when its size is limited. According to analysis and calculation, a design with 24° film inclination is presented, which can realize horizontal and vertical expansion. The system can also achieve 20° horizontal FOV and 13.4° vertical FOV.