Telegraphy – Systems – Position coordinate determination for writing
Patent
1988-06-30
1989-10-10
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
350117, 340705, 340706, 340784, G08C 2100, G03B 2114
Patent
active
048733989
ABSTRACT:
A novel flat panel display is provided which allows for very precise and reliable detection of the location of the cursor with respect to the displayed image. Parallax problems are eliminated by focusing the displayed image on a panel by projecting the image through the panel. The location of the stylus is accurately determined, in one embodiment, utilizing prior art digitizing techniques together with the use of an erect, unity magnification imaging lens array for displaying the projected image. In another embodiment of this invention, accurate determination of the location of the stylus with respect to the displayed image is provided by causing the stylus to feed signals, for example optical signals, through a significant portion of the optical path used for displaying the image.
REFERENCES:
patent: 4679909 (1987-07-01), Hamada et al.
patent: 4760389 (1988-07-01), Aoki et al.
Scriptel SPD-Series Technical Report No. SPD-TR2, May 1985.
Photron Integrated Display Digitizer FIOS-6440 (data sheet).
Sony Transparent Tablet TNN-01 (data sheet).
A View Pad--Japanese Data Sheet.
"Handwriting Recognition on Transparent Tablet Over Flat Display", by Tappert et al., in SID 86 Digest, Article 17.3.
"Photolytic Technique for Producing Microlenses in Photosensitive Glass", by Borrelli et al., in Applied Optics, vol. 24, No. 16, Aug. 15, 1985.
"Close-up Imaging of Documents and Displays with Lens Arrays", by R. H. Anderson, in Applied Optics, vol. 18, No. 4, Feb. 15, 1979.
Hewlett--Packard Company
Howard William H. F.
Schreyer Stafford D.
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