Backlight | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Backlight


00:01:29 1 Light source types
00:02:26 2 Usage
00:03:33 2.1 CCFL backlights
00:04:24 2.2 LED backlights
00:12:12 2.2.1 Backlight dimming
00:13:53 3 Diffusers
00:14:41 4 Reflective polarizers
00:16:13 5 Power consumption



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Speaking Rate: 0.9389984350058718
Voice name: en-US-Wavenet-A


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SUMMARY
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A backlight is a form of illumination used in liquid crystal displays (LCDs). As LCDs do not produce light by themselves—unlike, for example, cathode ray tube (CRT) displays—they need illumination (ambient light or a special light source) to produce a visible image. Backlights illuminate the LCD from the side or back of the display panel, unlike frontlights, which are placed in front of the LCD. Backlights are used in small displays to increase readability in low light conditions such as in wristwatches, and are used in smart phones, computer displays and LCD televisions to produce light in a manner similar to a CRT display. A review of some early backlighting schemes for LCDs is given in a report Engineering and Technology History by Peter J. Wild.Simple types of LCDs such as in pocket calculators are built without an internal light source, requiring external light sources to convey the display image to the user.  Most LCD screens, however, are built with an internal light source.  Such screens consist of several layers.  The backlight is usually the first layer from the back.  Light valves then vary the amount of light reaching the eye, by blocking its passage in some way.   Most use a fixed polarizing filter  and a switching one, to block the undesired light.