| 单词 | screen saver | |||
| 释义 | screen saverscreen saverscreen′ sav`ern.
screen saverscreen saver[′skrēn ‚sāv·ər]screen saver(tool)Approximately pre-1990, many cathode ray tubes, in TVs,computer monitors or elsewhere, were prone to "burn-in";that is, if the same pattern (e.g., the WordPerfect statusline; the Pong score readout; or a TV channel-numberdisplay) were shown at the same position on the screen forvery long periods of time, the phosphor on the screen would"fatigue" and that part of the screen would seem greyed out,even when the CRT was off. Eventually CRTs were developed which were resistant to burn-in(and which sometimes went into sleep mode after a period ofinactivity); but in the meantime, solutions were developed:home video game systems of the era (e.g., Atari 2600s) would,when not being played, change the screen every few seconds, toavoid burn-in; and computer screen saver programs weredeveloped. The first screen savers were simple screen blankers - theyjust set the screen to all black, but, in the best case ofcreeping featurism ever recorded, these tiny (often under 1Klong) programs grew without regard to efficiency or even basicusefulness. At first, small, innocuous display hacks(generally on an almost-black screen) were added. Later, morecomplex effects appeared, including animations (often withsound effects!) of arbitrary length and complexity. Along the way, avoiding repetitive patterns and burn-in wascompletely forgotten and "screen savers" such as Pointcastwere developed, which make no claim to save your monitor, butare simply bloated browsers for push media whichself-start after the machine has been inactive for a fewminutes. screen saverA utility that was originally created to prevent a CRT from being etched by an unchanging image. After a specified duration of time without keyboard or mouse input, it blanks the screen or displays moving objects. Pressing a key or moving the mouse restores the screen. Screen savers can be password enabled so that no one else can gain access to the computer when users leave them running.More Now for Fun and Security With the vast improvements made to CRTs over the years, it would actually take many hours to burn an image onto a late model CRT. In addition, LCD flat panel monitors do not use phosphors and are not subject to burn-in. However, the security aspect as well as the entertainment they offer (swimming fish, flying toasters, etc.) makes them a popular and worthwhile utility. See screen burn. See SS screen saver
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screen saver - (computer science) a moving design that appears on a computer screen when there has been no input for a specified period of time; "screen savers prevent the damage that occurs when the same areas of light and dark are displayed too long"