Anti-glare screen with electromagnetic interference rejection

• US 4,246,613 A
• Filed: 01/10/1979
• Issued: 01/20/1981
• Est. Priority Date: 01/10/1979
• Status: Expired due to Term

• Current Assignee: Delta Tau Data Systems, Inc. (Omron Corporation)
• Original Assignee: Delta Tau Data Systems, Inc. (Omron Corporation)
• Inventors: Pote, Robert H., Choder, Jerome, Becker, Philip F., Gewalt, Ryerson J.
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US06/002,269
• Time in Patent Office: 741 Days
• Field of Search: 358/245, 358/252, 358/253, 358/255
• US Class Current: 348/819
• CPC Class Codes: G06F 1/1609 to support filters or lenses
• CPC Class Codes: H01J 2229/8633 Meshes and patterns
• CPC Class Codes: H01J 29/185 measures against halo-phenomena
• CPC Class Codes: H01J 29/868 Screens covering the input or output face of the vessel, e.g. transparent anti-static coatings, X-ray absorbing layers

Abstract

A non-glare, electromagnetic interference rejecting screen for a video display terminal. The screen comprises a front panel, formed of a transparent material, a rear panel, formed of a transparent material and a woven mesh screen interposed therebetween. A gasket is disposed about the front panel, with peripheral edge portions of the screen extending over the gasket. The screen is mounted on the display terminal so that the wire mesh is interposed between the gasket and the screen retaining frame, e.g., bezel, to form a good electrical interface therebetween. The strands of the screen are disposed at right angles to one another, with none of said strands being disposed horizontally or vertically. The strands are formed of electrically conductive material and are coated with silver. The silver surface is in the form of silver sulfide to give a darkened appearance.

Claims

1. A screen for a video display terminal, said terminal comprising alpha-numeric display means, a case therefor and electrically conductive retaining means for engaging and retaining said screen, said screen being arranged to reduce glare on said display means and to attenuate electromagnetic interference emanating from said display means, said screen comprising a transparent front panel, a transparent rear panel, gasket means encircling the periphery of said front panel and a mesh of electrically conductive strands interposed between said panels and including peripheral portions extending beyond the periphery of said front panel to overly the gasket and directly engage said retaining means to form an electrically conductive interface therebetween.

2. The screen of claim 1 wherein said strands of said mesh are woven.

3. The screen of claim 2 wherein said strands are coated with silver, said coating being darkened.

4. The screen of claim 3 wherein said darkened coating comprises silver sulfide.

5. The screen of claim 4 wherein said woven strands comprise two groups which intersect at generally right angles to one another, said mesh being oriented so that none of the strands of either group are disposed horizontally or vertically.

6. The screen of claim 5 wherein one of said groups of strands is disposed at approximately 15 degrees to the horizontal and the other group of said strands is disposed at approximately 15 degrees to the vertical.

7. The screen of claim 5 wherein said gasket means is resilient.

8. The screen of claim 5 wherein said rear panel includes a front peripheral surface on which said gasket is disposed and a rear surface, the peripheral portions of said mesh extending fully over said gasket, with the edge portions of said mesh being secured to the rear surface of said rear panel.

9. The screen of claim 8 wherein the edge of said mesh is secured to the rear surface of said rear panel by metallic tape.

10. The screen of claim 9 wherein said gasket means is resilient.