Browse Prior Art Database

PHOSPHOR SAVER SCREENS

IP.com Disclosure Number: IPCOM000026022D
Original Publication Date: 1989-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 90K

Publishing Venue

Xerox Disclosure Journal

Abstract

In order to prevent or delay the phenomena of image "burn-in" on a CRT type user interactive display, it is desirable to reduce or balance over time the "lighted" screen phosphors during non-interactive periods. The most apparent method of implementin this requirement is to blank or blacken the

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CEROX DISCLOSURE JOURNAL

PHOSPHOR SAVER SCREENS Proposed Classification Murray 0. Meetze U.S. C1.355/3R

Int. C1. G03g 15/00

In order to prevent or delay the phenomena of image "burn-in" on a CRT type user interactive display, it is desirable to reduce or balance over time the "lighted" screen phosphors during non-interactive periods. The most apparent method of implementin this requirement is to blank or blacken the

undesirable because it may mislead the user into believing that the system has been turned off. Normally, this situation is dealt with through the use of a graphic or message that moves or bounces around on the screen. Implementation of this type of bouncing prompt however can sometimes be prohibitively expensive to implement, requiring additional system memory. Also, the bouncing prompt may not lend itself to communicating complex messages to uninformed users.

screen after a specified period o f inactivity. This approach is occasionally

The phenomena of CRT image "burn-in'' can be minimized through the use of an algorithm to balance the amount of time that individual phosphor elements of the CRT are in a "1ighted"or on condition. This scenario will minimize the effects of screen "burn-in" discussed above.

Implementation of this approach is accomplished via pixel-for-pixel inversion of the image in the case of a monochrome display, generating two screens that are the exact negative of one another. During "idle" periods, the two screens will alternate....