Transparent display for mobile device

摘要

A projection-type display device is connectively coupled to a mobile device (such as a smartphone) where the light generated by a small projection device is directed at a relatively transparent holographic optical element (HOE) to provide a display to an operator of the mobile device or a viewer. The projector and HOE may be configured to produce and magnify a virtual image that is perceived as being displayed at a large distance from the operator who views the image through the HOE. The HOE may comprise a volume grating effective at only the narrow wavelengths of the projection device to maximize transparency while also maximizing the light reflected from the display projector to the eyes of the operator.

主权项

1. A mobile device comprising:
a mobile base comprising a processor and a memory to produce an image; a projection device operatively coupled to the mobile base for displaying the image; and a transparent display surface comprising a holographic optical element and operatively coupled to the mobile base for directing the displayed image projected by the projection device, wherein the projection device is oriented to project the display image in a direction away from an operator of the mobile device, wherein the transparent display surface is oriented to reflect the display image toward the operator of the mobile device, wherein the holographic element refracts a first set of wavelengths of light from the projection device while allowing a second set of wavelengths of light from a background feature to pass through the holographic optical element and the transparent display surface towards the operator, and wherein the background feature is located behind the transparent display surface and the projection device is located in front of the transparent display surface.