Then you use an app to display your script on the device's screen. This is reflected in the glass. You lie your phone or tablet flat, in a tray in front of the glass. However, a new generation of cheaper, smaller and lighter devices have recently emerged to serve the YouTube generation. Teleprompters have been used in broadcast television since the Fifties, but have traditionally been very expensive. So while you can see the words, they're invisible to your camera and so don't appear on the recording. This clever trick means you can read the text while looking straight at the lens. The glass is constructed in a way that splits the light in two (known as a beam splitter). The words are reflected on a special sheet of glass in front of your camera. So how does it work? Essentailly these devices display your script as scrolling text (like in the opening of a Star Wars film).
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