Browse Prior Art Database

Oriented Display for Graphics Tablet

IP.com Disclosure Number: IPCOM000041867D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Kirkman, DH: AUTHOR

Abstract

A recent article [*] describes a graphics tablet in which a portion of the action tablet surface serves as a screen for a back-lit display. In order to reduce power requirements for the illumination, the screen is of the high gain type and produces a narrow viewing angle centered on the axial ray from the projection lens. This is normal to the tablet surface which is at an angle of 20Πor less to the horizontal. It can be shown that this is not ideal for viewing by a normally seated operator, and that the axial ray should be tilted towards the operator by about 26-27Πrelative to the normal for optimum viewing. Referring to the figure this is achieved by placing a 45Πlinear fresnel plate beneath the active tablet surface in the area of the back-lit display.

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Oriented Display for Graphics Tablet

A recent article [*] describes a graphics tablet in which a portion of the action tablet surface serves as a screen for a back-lit display. In order to reduce power requirements for the illumination, the screen is of the high gain type and produces a narrow viewing angle centered on the axial ray from the projection lens. This is normal to the tablet surface which is at an angle of 20OE or less to the horizontal. It can be shown that this is not ideal for viewing by a normally seated operator, and that the axial ray should be tilted towards the operator by about 26-27OE relative to the normal for optimum viewing. Referring to the figure this is achieved by placing a 45OE linear fresnel plate beneath the active tablet surface in the area of the back-lit display. In cross-section the individual serrations constitute right-angled isosceles triangles and have the effect of refracting the axial ray by about 26OE towards the operator. Reference * M. I. Davis, M. J. Garrett, D. H. Kirkman and J. A. Wiseman, "Interactive Display Tablet," IBM Technical Disclosure Bulletin 25, 11B 5905-5906 (April 1983).

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