USH716H — Parallax induced pointing error avoidance method …

Claim 1

Independent Claim 171 words

The process of compensating for parallax-induced errors associated with use of an electronically generated visual display which is viewed through a medium that is prone to causing apparent image displacement from parallax distortion and wherein touching by the user of one or more discrete areas causes actuation of a touch responsive means, comprising the steps of: determining the amount of offset distance of visually apparent shift caused by parallax from viewing said medium at a preselected maximum angle relative to the display surface; assigning a guard band around at least a portion of the perimeter of each area of the electronically-generated visual display which is to receive selected touch actuation with said guard band having a width for extending the perimeter of said touch selected area by an amount correlated to said determined offset distance caused by said parallax distortion; and responding to touching within said guard band by generating a signal for indicating to the touch responsive means that the said discrete area adjacent to said guard band was touched.

Claim 2

Dependent Claim 171 words

The process of compensating for parallax-induced errors associated with use of an electronically generated visual display which is viewed through a medium that is prone to causing apparent image displacement from parallax distortion and wherein touching by the user of one or more discrete areas causes actuation of a touch responsive means, comprising the steps of: determining the amount of offset distance of visually apparent shift caused by parallax from viewing said medium at a preselected maximum angle relative to the display surface; assigning a guard band around at least a portion of the perimeter of each area of the electronically-generated visual display which is to receive selected touch actuation with said guard band having a width for extending the perimeter of said touch selected area by an amount correlated to said determined offset distance caused by said parallax distortion; and responding to touching within said guard band by generating a signal for indicating to the touch responsive means that the said discrete area adjacent to said guard band was touched.

Claim 3

Dependent Claim 57 words

The process in accordance with claim 1 for use with a display composed of a cathode ray tube having a transparent touch sensitive screen overlay, said determining step including the step of determining the parallax shift at the said preselected maximum angle relative to the display surface through the combined media of said tube and said screen.

Claim 4

Dependent Claim 126 words

The process of avoiding parallax-induced errors in an electronically-generated display visible at a surface through a plate of a thickness T of transparent media having a refraction index R where the display is to function as an input device to a data processing system, or the like, by touching of areas associated with the display comprising the steps of: determining the maximum angle A1 from perpendicular from the said display surface for which touch selection is allowed free from parallax-induced errors; and providing a guard band along at least a portion of the perimeter of each touch-selective area of the display where the width P of the guard band is the product of T times tan A2 where A2 is equal to SIN -1 [(SIN A1)/R].

Claim 5

Dependent Claim 126 words

The process of avoiding parallax-induced errors in an electronically-generated display visible at a surface through a plate of a thickness T of transparent media having a refraction index R where the display is to function as an input device to a data processing system, or the like, by touching of areas associated with the display comprising the steps of: determining the maximum angle A1 from perpendicular from the said display surface for which touch selection is allowed free from parallax-induced errors; and providing a guard band along at least a portion of the perimeter of each touch-selective area of the display where the width P of the guard band is the product of T times tan A2 where A2 is equal to SIN -1 [(SIN A1)/R].

Claim 6

Dependent Claim 27 words

The process in accordance with claim 3 wherein said guard band is invisible and the spacing between the edges of any neighboring touch-selective display areas is 2P.

Claim 7

Dependent Claim 171 words

The process of avoiding parallax-induced errors in an electronically-generated display visible at the inner surface of a cathode ray tube having a face plate of a thickness Tg of transparent media having a refraction index Rg with a touch-sensitive panel overlaying said display face where the panel has a thickness Tp and a refraction index Rg, and where the display is to function as an input device to a data processing system, or the like, by detecting the touching of said panel in areas associated with the display at the cathode ray tube inner surface comprising the steps of: determining the maximum angle Al for the viewer's line of sight from a line perpendicular to the plane of the display inner surface for which touch selection is allowed free from parallax-induced errors; and providing a guard band around each area of the cathode ray tube display which is touch selectable at the touch panel where the width P of said guard band is defined by P=(Tg+Tp)tan A2 wherein A2=SIN.sup.-1 /[(SIN A1)/Rg].

Claim 8

Dependent Claim 171 words

The process of avoiding parallax-induced errors in an electronically-generated display visible at the inner surface of a cathode ray tube having a face plate of a thickness Tg of transparent media having a refraction index Rg with a touch-sensitive panel overlaying said display face where the panel has a thickness Tp and a refraction index Rg, and where the display is to function as an input device to a data processing system, or the like, by detecting the touching of said panel in areas associated with the display at the cathode ray tube inner surface comprising the steps of: determining the maximum angle Al for the viewer's line of sight from a line perpendicular to the plane of the display inner surface for which touch selection is allowed free from parallax-induced errors; and providing a guard band around each area of the cathode ray tube display which is touch selectable at the touch panel where the width P of said guard band is defined by P=(Tg+Tp)tan A2 wherein A2=SIN.sup.-1 /[(SIN A1)/Rg].

Claim 9

Dependent Claim 32 words

The process in accordance with claim 5 wherein said providing step establishes an invisible said guard band with at least 2P separation between visible boundaries of touch-selectable areas on the tube display.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1992-12-04	1993-06-05	1993-12-05	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1996-12-04	1997-06-05	1997-12-05	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2000-12-04	2001-06-05	2001-12-05	$7700.00	Window Closed / Lapsed

Parallax induced pointing error avoidance method and means for systems using touch screen overlays

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