Virtual input element image projection apparatus
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United States of America Patent
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Jun 9, 2009
Grant Date -
Jun 16, 2005
app pub date -
Jun 17, 2004
filing date -
Dec 16, 2003
priority date (Note) -
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Abstract
A virtual input element image projection apparatus couples a suitable lens and an optical element to increase the diverging angle of a virtual input element image or generate a plurality of portions of the virtual input element image that are coupled to form the complete virtual input element image without reducing diffraction efficiency. The projection distance for generating the virtual input element image may also be shortened.
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