Browse Prior Art Database

Reduction of Reflections on CRT Displays

IP.com Disclosure Number: IPCOM000043432D
Original Publication Date: 1984-Aug-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Beeteson, JS: AUTHOR

Abstract

A measurement method is described to select the best orientation of an anti-reflective panel with respect to a CRT screen before bonding. Reflection measurements are made at the center and at each corner. Anti-reflective panels are sorted to select those where specular reflections are minimized at the center and top half, and to reject unsuitable panels. The same measurement technique may be employed with CRT screens having anti-reflective layers applied directly to the screen by selecting the best orientation before gun and neck hardware are fixed. This article discloses how specular reflections can be minimized over the most important part of a CRT screen, when using a multilayer thin-film type of anti-reflective (A/R) coating.

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Reduction of Reflections on CRT Displays

A measurement method is described to select the best orientation of an anti- reflective panel with respect to a CRT screen before bonding. Reflection measurements are made at the center and at each corner. Anti-reflective panels are sorted to select those where specular reflections are minimized at the center and top half, and to reject unsuitable panels. The same measurement technique may be employed with CRT screens having anti-reflective layers applied directly to the screen by selecting the best orientation before gun and neck hardware are fixed. This article discloses how specular reflections can be minimized over the most important part of a CRT screen, when using a multilayer thin-film type of anti-reflective (A/R) coating. An analysis has shown that the center and top half of the screen are the areas which suffer most from specular reflections. Therefore, it is most important to minimize reflections in these areas. An analysis of the production spread of reflectance from various parts of A/R- coated panels, has indicated that appropriate selection can force the largest reflection to the bottom of the panel, and so minimize the reflection in the center and top half of the panel. An analysis of the spectral scans of A/R coatings led to a fast and easy way of measuring panels in a production environment described herein, so allowing the minimum reflection point to be identified as the top of the panel. The figure illu...