Faceplate for an interactive display terminal

• US 5,398,046 A
• Filed: 10/01/1993
• Issued: 03/14/1995
• Est. Priority Date: 10/01/1993
• Status: Expired due to Fees

• Current Assignee: Litton Systems Incorporated
• Original Assignee: Litton Systems Incorporated
• Inventors: Szegedi, Nicholas J., Eustis, Eric R.
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): LAO, LUN YI
• Application Number:
  US08/130,241
• Time in Patent Office: 529 Days
• Field of Search: 348/818, 348/819, 348/820, 174/35 R, 174/35 MS, 174/35 C, 361/816, 361/818, 340/815.42, 340/815.5, 340/815.59, 345/173, 345/32, 345/174, 345/175, 345/179, 178/18, 178/19
• US Class Current: 345/174
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: H01H 13/702 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
• CPC Class Codes: H01H 2219/012 programmable
• CPC Class Codes: H01H 2219/016 programmable
• CPC Class Codes: H01H 2219/058 Optical grid, collimator or microlouver
• CPC Class Codes: H01H 2239/004 High frequency adaptation or shielding

Abstract

A faceplate assembly has an electrically conductive grid, which is electrically connected to a suitable ground potential, positioned on or above a display screen of an interactive display terminal (IDT) where the grid has a plurality of optical pipes with metal walls, which provide electromagnetic interference (EMI) protection, and with optical cores, which enhance visibility, that optically pipe information originally displayed on the IDT screen which is piped to a viewing plane developed by the grid. A continuous, serpentine electrical conductor is carried by and positioned over the optical pipe walls by a flexible, transparent overlay sheet that can be flexed to bring a selected portion of the electrical conductor into an electrical switch closed position with an adjacent optical pipe wall(s). This selected grid position is electrically measurable and thereby determined.

Claims

1. In an interactive display terminal having an alphanumeric and graphic display surface which is generally planar, a faceplate for the display surface comprising:

a) an electrically conductive metal grid having a plurality of grid openings positioned on the display surface permitting a substantially unobstructed planar view of alphanumeric and/or graphic indicia which may be visible at the display surface where each of said openings has a grid outer casing or wall having its longitudinal axis on a geometric center of said grid opening oriented generally perpendicular to the plane of the display surface,

b) an electrical ground means connected to said electrically conductive metal grid placing said metal grid and its grid opening walls at a common electrical potential,

c) respective ones of a plurality of optically transparent pipes individually positioned within associated ones of said grid opening walls permitting the planar view at a generally longitudinally extending plane spaced apart from the display surface,

d) a continuous serpentine electrical conductor aligned off said geometric centers over said grid opening walls spaced apart from said generally longitudinally extending plane and selectively movable into electrical contact with an adjacent portion of said grid wall, and

e) electrical resistance measurement means responsive to said electrical contact generating an output signal representative of the position of said contact relative to the display surface.

2. The faceplate of claim 1 in which said grid openings define an outwardly extending honeycomb layer positioned on the display surface,

3. The faceplate of claim 1 in which said grid provides radio frequency (rf) attenuation.

4. The faceplate of claim 3 in which each of said electrically conductive grid walls is an electromagnetic radiation waveguide.

5. The faceplate of claim 2 in which said grid openings have a substantially circular cross section in a plane parallel with the display surface.

6. The faceplate of claim 2 in which said grid openings have a noncircular cross section in a plane parallel with the display surface.

7. The faceplate of claim 1 in which said grid walls have an outer edge with an electrically conductive anti-glare surface finish.

8. The faceplate of claim 1 in which said serpentine electrical conductor is carried by a flexible and optically transparent overlay sheet spaced apart from said grid.

9. The faceplate of claim 8 in which said overlay sheet is an interactive surface for the terminal.

10. The faceplate of claim 1 in which said resistance measurement means is a voltage-divider circuit.

11. In an interactive display terminal having an alphanumeric and graphic display surface which is generally planar, a faceplate for the display surface comprising:

a) a honeycomb electrically conductive grid positioned on the display surface having outwardly extending grid walls that divide the display surface into a plurality of discrete elements,

b) an electrical ground means connected to said grid placing said grid at a common electrical potential,

c) optically transparent means positioned at each one of said plurality of discrete elements and bounded by at least said grid wall, said transparent means permitting a view of indicia visible at the display surface along a generally longitudinally extending plane spaced apart from the planar display surface,

d) a single electrical conductor spaced apart from and superimposed above selected grid walls of said plane, said conductor selectively movable into electrical contact with an adjacent and associated grid wall which connects said conductor to said common electrical potential, and

e) electrical resistance measurement means responsive to each electrical contact and generating a corresponding output signal representative of the position coordinates of said contact relative to the display surface.

12. The faceplate of claim 11 in which said honeycomb grid provides an electromagnetic screen for each of said discrete elements of the display surface.

13. The faceplate of claim 12 in which said electromagnetic screen provides radio frequency (rf) attenuation.

14. The faceplate of claim 11 in which said optical transparent means provides an optical pipe for enhanced viewing of any display surface indicia at said longitudinally extending plane.

15. The faceplate of claim 11 in which said single electrical conductor is serpentine.