What is this application about? A screensaver is a
computer program that blanks the screen or fills it with moving images
or patterns
when the computer is not in use. Initially designed to
prevent phosphor burn-in on CRT and plasma
computer monitors, screensavers
are now used primarily for entertainment, security or to
display system
status information.
|
You are just one click away from starting the download... |
- Step 1: Download Setup File
- Step 2: Click "Allow"
- Step 3: Click "Install"
- Step 4: Easy installation will now begin
- Free Full Version for Windows 7, Vista, XP
License: | Freeware |
---|---|
Size: | 3.60 MB |
Requirements: | No special requirements |
OS: | Windows 7,Vista, XP |
Last Updated: | April 21st, 2012 |
Purpose
Before the advent of LCD screens, most computer screens were based on cathode ray tubes (CRTs). When the same image is displayed on a CRT screen for long periods of time, the properties of the exposed areas of phosphor coating on the inside of the screen gradually and permanently change, eventually leading to a darkened shadow or "ghost" image on the screen. Cathode ray televisions, oscilloscopes and other devices that use CRTs are all susceptible to phosphor burn-in, as are plasma displays to some extent.Screen-saver programs were designed to help avoid these effects by automatically changing the images on the screen during periods of user inactivity.
For CRTs used in public, such as ATMs and railway ticketing machines, the risk of burn-in is especially high because a stand-by display is shown whenever the machine is not in use. Older machines designed without burn-in problems taken into consideration often display evidence of screen damage, with images or text such as "Please insert your card" (in the case of ATMs) visible even when the display changes while the machine is in use. Blanking the screen is out of the question as the machine would appear to be out of service. In these applications, burn-in can be prevented by shifting the position of the display contents every few seconds, or by having a number of different images that are changed regularly.
Modern CRTs are much less susceptible to burn-in than older models due to improvements in phosphor coatings, and because modern computer images are generally lower contrast than the stark green- or white-on-black text and graphics of earlier machines. LCD computer monitors, including the display panels used in laptop computers, are not susceptible to burn-in because the image is not directly produced by phosphors (although they can suffer from a less extreme and usually non-permanent form of ). For these reasons, screensavers today are primarily for decorative/entertainment purposes, or for password protection. They usually feature moving images or patterns and sometimes sound effects.
One increasingly popular application is for screensavers to activate a useful background task, such as a virus scan (for example, Avast comes with this feature, and it shows a screensaver [from your computer, you can choose it] with an overlaying blue window showing the progress. If a virus is detected, the window turns red and the scan is stopped, and the alert is shown once you exit the screensaver) or a distributed computing application. This allows applications to use resources only when the computer would be otherwise idle.
No comments:
Post a Comment