WEBVTT

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remember when smartphones and stereoscopic dual screen systems like

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the 3DS weren't the order of the day and portable gaming meant enjoying your

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original game boy in all its monochrome Glory well that was only glorious until

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the sun went down because it was impossible to see the screen without

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shining a light on it because it was an LCD display with no backlighting you see

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LCDs whether they're the simple ones and things like a game boy or a calculator

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or the more complex ones in modern flat panel monitors and televisions cannot

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actually produce their own light oleds

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are different you can learn more about those here but conventional LCD screens

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solve this problem by putting a light of some sort behind the panel which shines

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through the LCD Illuminating the image so you can actually see what's going on

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and even though older CRT monitors didn't have this issue because they used

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phosphorescent materials that glowed on the screen LCDs quickly became more

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popular due to their lower weight and power consumption not to mention their

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smaller size and eventually higher image

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quality so backlights became a fixture in modern displays earlier flat panel

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monitors used backlights called cold cathode fluorescent lamps or ccfls these

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were basically just tubular bulbs like the ones you'd find installed in an

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office but smaller installed behind the

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LCD and they're actually pretty similar as well to the cold cathode tubes that

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modders use for case lighting ccfls were

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cheap and easy to install in displays but had a number of limitations they

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were heavy they consumed a lot of power and they couldn't regulate the

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brightness of small areas of the screen with any Precision whatsoever since it

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was only a few bulbs that would illuminate the entire screen resulting

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in issues with black levels and image accuracy that left a lot to be desired

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ccfls also had the issue of taking several minutes to achieve full

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brightness after you turned them on much like a a light bulb can take some time

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to warm up and even though some ccfls

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were marketed as wide gamut meaning they

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had different phosphors inside the bulbs that could produce more colors LED

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displays quickly displaced ccfls when they hit the market due to their lighter

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weight lower power consumption and greater black levels but even with these

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advantages there were still some Kinks to work out a run-of-the-mill LED

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monitor replaces those bulbs with LEDs which is cool but it uses blue LEDs with

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yellow phosphor to create white light

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which makes a nice enough looking picture but because the LEDs themselves

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are blue the backlight still emits a lot

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more blue energy than red or green making colors inherently a little

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lopsided so for a while wide gamut ccfls

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for all of their flaws still offer better color reproduction than LED

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backlit panels until more recently when these wide gamut ccfls were dethroned by

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either RG phosphor monitors which use

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red and green phosphors combined with blue LEDs or the higher-end RGB LED

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displays which have red green and blue

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LEDs in the backlight both of these

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Technologies enable the monitor to emit more pure red green and blue energy

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making for more accurate color without the drawbacks of

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ccfls but led backlights differ in more

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ways than just color as some consist of a full array of LEDs behind the screen

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While others are only EDG lit with LED bulbs around well the edges of the

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display EDG lit displays use a special layer called a diffuser to spread the

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light out over the entire screen area and are commonly found in smartphones

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and less expensive desktop and television displays full array LED

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backlights tend to give higher picture quality but are a little bulkier not to

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mention more expensive than their EDG lit

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counterparts some Led displays use their

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full array to enable a feature called local dimming which means that they can

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actually adjust the brightness of small portions of the screen on the Fly for

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more accurate black levels and color saturation but regardless of exactly

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what type of LED screen you end up buying try and find out whether it uses

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pwm or DC for its backlight dimming

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whether it's for local dimming or just for turning down the overall brightness

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of the image coming out of the display now you might be familiar with these

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terms if you've shopped for case fans for example but what they mean for

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monitors is this a pwm display dims

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Itself by making the backlight flicker a

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certain number of times per second the light is always on at the same brightness it's just actually off some

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of the time and so you'll perceive it as dimmer and while pwm is easy for

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manufacturers to implement some people do find this super fast flickering

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distracting and fatiguing on their eyes which is why some companies Market their

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DC that is voltage control backlight monitors as flicker free but hold on a

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second lonus come on backlights that's old technology OLED generates its own

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light and is becoming increasingly popular well that's true but for now the

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vast majority of displays out there use backlighting of some sort and they tend

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to be cheaper than oleds without some of the longevity and burning concerns that

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come along with OLED technology so while uh you know getting a fancy OLED screen

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might seem kind of appealing to you you got to make sure that you monitor just

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how much money you have in your bank account before you go for it and

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speaking of terrible jokes audible.com

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audible.com Tech Quicky thanks for watching guys if you like this video

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