Screensaver for computer

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A screensaver is a type of computer program initially designed to prevent "Phosphor burn-in" on CRT and plasma computer monitors by blanking the screen or filling it with moving images or patterns when the computer is not in use. Today, screensavers are also used for entertainment or security purposes. For example :

Fairy Christmas Day 3D Screensaver is a unique combination of a 3D Christmas screensaver and game. It will beautify your desktop with fairy views of a snowy forest with Santa's workshop in the middle. You'll hear joyful holiday music, see colorful fireworks and a mysterious forest with a beautiful Christmas tree, and play a fun little game where you can help Santa save his gifts from evil gnomes. This screensaver certainly will bring a bit of the Christmas spirit into your home. Merry Christmas!

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Purpose

Before the advent of LCD screens, most computer screens depended 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. Televisions, oscilloscopes and other devices that use CRTs are all susceptible to phosphor burn-in , as are plasma displays to some extent.

Screensaver 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 is 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 image persistence). For these reasons, screensavers today are primarily decorative or for entertainment, and 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 or a distributed computing application (such as the SETI@home project). This is convenient because these applications only use resources when the computer would be otherwise idle.

fr: wikipedia

Here some sample :

1. Mystify Flashing ScreenSaver Download Download

Mystify Flashing Screensaver - Enjoy infinite light show on your screen. The movements of the shine balls that flash and grow from the center create lovely chaos on your screen that can mystify your mind.
The spiral rotation in the background just contributes.
This simple 3D animation makes great cyber look and feel of Mystify Flashing ScreenSaver.

2. Renoir Fine Art ScreenSaver Download Download

Renoir Fine Art ScreenSaver is slide show screensaver with animated intro. It covers 15 paintings by Pierre Auguste Renoir. The screensaver supports dual monitor and background sound. It is highly customizable. You can customize/select from 120 transition effects and make/edit your music playlist

3. Transitions ScreenSaver Download DownloadBuy

Transitions ScreenSaver shows endless transitions between random colorings of your screen. Occasionally, it displays messages like: 'Do not touch my computer', 'Someone Else owns this computer', etc. The screensaver supports background sound. You can create/edit your music playlist or disable the sound. Dual monitor supported, too.

4. Vincent van Gogh Paintings ScreenSaver Download Download

Vincent van Gogh Paintings ScreenSaver is slide show screensaver that covers 15 paintings by Vincent van Gogh.
The screensaver supports dual monitor and background sound. It is highly customizable...

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