remember when smartphones and stereoscopic dual screen systems like
the 3DS weren't the order of the day and portable gaming meant enjoying your
original game boy in all its monochrome Glory well that was only glorious until
the sun went down because it was impossible to see the screen without
shining a light on it because it was an LCD display with no backlighting you see
LCDs whether they're the simple ones and things like a game boy or a calculator
or the more complex ones in modern flat panel monitors and televisions cannot
actually produce their own light oleds
are different you can learn more about those here but conventional LCD screens
solve this problem by putting a light of some sort behind the panel which shines
through the LCD Illuminating the image so you can actually see what's going on
and even though older CRT monitors didn't have this issue because they used
phosphorescent materials that glowed on the screen LCDs quickly became more
popular due to their lower weight and power consumption not to mention their
smaller size and eventually higher image
quality so backlights became a fixture in modern displays earlier flat panel
monitors used backlights called cold cathode fluorescent lamps or ccfls these
were basically just tubular bulbs like the ones you'd find installed in an
office but smaller installed behind the
LCD and they're actually pretty similar as well to the cold cathode tubes that
modders use for case lighting ccfls were
cheap and easy to install in displays but had a number of limitations they
were heavy they consumed a lot of power and they couldn't regulate the
brightness of small areas of the screen with any Precision whatsoever since it
was only a few bulbs that would illuminate the entire screen resulting
in issues with black levels and image accuracy that left a lot to be desired
ccfls also had the issue of taking several minutes to achieve full
brightness after you turned them on much like a a light bulb can take some time
to warm up and even though some ccfls
were marketed as wide gamut meaning they
had different phosphors inside the bulbs that could produce more colors LED
displays quickly displaced ccfls when they hit the market due to their lighter
weight lower power consumption and greater black levels but even with these
advantages there were still some Kinks to work out a run-of-the-mill LED
monitor replaces those bulbs with LEDs which is cool but it uses blue LEDs with
yellow phosphor to create white light
which makes a nice enough looking picture but because the LEDs themselves
are blue the backlight still emits a lot
more blue energy than red or green making colors inherently a little
lopsided so for a while wide gamut ccfls
for all of their flaws still offer better color reproduction than LED
backlit panels until more recently when these wide gamut ccfls were dethroned by
either RG phosphor monitors which use
red and green phosphors combined with blue LEDs or the higher-end RGB LED
displays which have red green and blue
LEDs in the backlight both of these
Technologies enable the monitor to emit more pure red green and blue energy
making for more accurate color without the drawbacks of
ccfls but led backlights differ in more
ways than just color as some consist of a full array of LEDs behind the screen
While others are only EDG lit with LED bulbs around well the edges of the
display EDG lit displays use a special layer called a diffuser to spread the
light out over the entire screen area and are commonly found in smartphones
and less expensive desktop and television displays full array LED
backlights tend to give higher picture quality but are a little bulkier not to
mention more expensive than their EDG lit
counterparts some Led displays use their
full array to enable a feature called local dimming which means that they can
actually adjust the brightness of small portions of the screen on the Fly for
more accurate black levels and color saturation but regardless of exactly
what type of LED screen you end up buying try and find out whether it uses
pwm or DC for its backlight dimming
whether it's for local dimming or just for turning down the overall brightness
of the image coming out of the display now you might be familiar with these
terms if you've shopped for case fans for example but what they mean for
monitors is this a pwm display dims
Itself by making the backlight flicker a
certain number of times per second the light is always on at the same brightness it's just actually off some
of the time and so you'll perceive it as dimmer and while pwm is easy for
manufacturers to implement some people do find this super fast flickering
distracting and fatiguing on their eyes which is why some companies Market their
DC that is voltage control backlight monitors as flicker free but hold on a
second lonus come on backlights that's old technology OLED generates its own
light and is becoming increasingly popular well that's true but for now the
vast majority of displays out there use backlighting of some sort and they tend
to be cheaper than oleds without some of the longevity and burning concerns that
come along with OLED technology so while uh you know getting a fancy OLED screen
might seem kind of appealing to you you got to make sure that you monitor just
how much money you have in your bank account before you go for it and
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