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Blanking the screen is out of the question as the machine would appear to be out of service. 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.
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Screen-saver programs were designed to help avoid these effects by automatically changing the images on the screen during periods of user inactivity.įor 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. Cathode ray televisions, oscilloscopes and other devices that use CRTs are all susceptible to phosphor burn-in, as are plasma displays to some extent. When the same image is displayed on a CRT screen for long periods, the properties of the exposed areas of the phosphor coating on the inside of the screen gradually and permanently change, eventually leading to a darkened shadow or "ghost" image on the screen, called a screen burn-in. Purpose Screen protection īefore the advent of LCD screens, most computer screens were based on cathode ray tubes (CRTs). Some screensaver programs also use otherwise-idle computer resources to do useful work, such as processing for distributed computing projects.Īs well as computers, modern television operating systems, media players, and other digital entertainment systems may include optional screensavers.
KEYBOARD SHORTCUT TO MAKE MY SCREENSAVER START PASSWORD
Screensavers are often set up to offer a basic layer of security by requiring a password to re-access the device.
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Though most modern monitors are not susceptible to this issue (with the notable exception of OLED technology, which has individual pixels vulnerable to burnout), screensaver programs are still used for other purposes. The original purpose of screensavers was to prevent phosphor burn-in on CRT or plasma computer monitors (hence the name). To test it, press the key sequence you setup in Keyboard preferences.World Community Grid screensaver that uses idle system resources to help analyze proteins.Ī screensaver (or screen saver) is a computer program that blanks the display screen or fills it with moving images or patterns when the computer has been idle for a designated time. Then, press the button sequence you want to use to launch the service (I use CNTL + OPT + CMD + S).įinally, in Security & Privacy > General, ensure Require Password after sleep or screensaver beings is set to immediately or whatever delay you wish. To Assign a keyboard shortcut, highlight the right column (it is kind of hidden but if you click on the Start Screensaver line right above the Restore Defaults button, the field should open up for editing.
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In the left column, click on Services and scroll the right column down to the bottom to find the Service you just created. Next, open System Preferences > Keyboard and go to the Shortcuts tab. Save your workflow with the same name you want it to have in the Services menu (such as "Start Screensaver"). Set the "Service receives selected" option to "no input". Type "screen" in the search field to locate the "Start Screen Saver" action and drag it to the workflow. Open Automator and choose "Service" as the template. Create a new Service to start the screen saver and set a keyboard shortcut to turn it on.