US Patent 7543940 Virtual input element image projection apparatus
Patent 7543940 was granted and assigned to Industrial Technology Research Institute on June, 2009 by the United States Patent and Trademark Office.
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Patent Inventor Names
Ching-Chin Wu0
Ying-Tsung Lu0
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Patent 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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US Patent 07543940 Virtual input element image projection apparatus US Patent 7543940 Virtual input element image projection apparatus
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Patent Number
075439400
Patent Number
75439400
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Current Assignee
Patent Jurisdiction
Patent Number
075439400
Date of Patent
June 9, 2009
0Patent Application Number
108687870
Date Filed
June 17, 2004
0Official Website
Patent Primary Examiner
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US Patent 07543940 Virtual input element image projection apparatus
Infobox
Is a
Current assignee
Patent jurisdiction
Patent number
07543940
Date of patent
June 9, 2009
Patent application number
10868787
Date Filed
June 17, 2004
Patent primary examiner
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