Compact compound magnified virtual image display with a reflective/transmissive optic

• Main Authors: KINTZ; GREGORY J, HILDEBRAND; ALFRED P
• Format: Patent
• Language: English
• Published: 23.11.1999
• Edition: 6
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

A compact virtual image display system is provided which includes a microdisplay; a first magnification optic consisting of three surfaces: a display input surface; a reflective/transmissive surface, and a reflective first magnification element surface; and a second magnification optic. Light forming the source object enters the first magnification optic at the display input surface. The light travels within the first magnification optic such that it is projected to an area on the reflective+544 transmissive surface that is at least partially within the full field of view provided by the second magnification optic. The light is directed to the reflective/transmissive surface at a first angle of incidence theta SO relative to the reflective/transmissive surface such that the light is internally reflected by the reflective/transmissive surface and directed to the reflective first magnification element surface. The first magnification element surface internally reflects the light corresponding to the source object as a magnified virtual image. The magnified virtual image is then is conveyed within the first magnification optic back to the reflective/transmissive surface at a second angle of incidence theta MVI relative to the reflective/transmissive surface such that the light is transmitted by the reflective/transmissive surface out of the first magnification optic. The second magnification optic is positioned to receive the magnified virtual image transmitted from the first magnification optic and transmit a compound magnified virtual image of the magnified virtual image of the source object to the observer.