Backlight Types As Fast As Possible

How do different types of display backlights work, and how do they affect image quality?

Thanks to Tyler Pruitt from SpectraCal for assisting us with this episode, and for the spectral measurement graphs.

[Alex-ydhj]

4:48 YOU HAD ONE JOB MR VIDEO EDITOR!!

[robert-bgpf]

For those that don't quite understand the relationship that Linus mentioned between the case fans and the back light, PWN is Pulse Width Modulation. On cooler fans the fan controler turns on and off the full voltage very very fast, resulting in the fan spinning at a constant speed that is dependent on the length of time between voltage "on" cycles. So with the backlights it's the same thing but instead the fan spinning, it makes the light appear to be a less bright as the time between "on" cycles increases.
The DC fan control is when the fan control simply reduces the voltage being put out to the fan which makes it spin slower the more the voltage is reduced. With the backlight it makes it dimmer the more voltage is reduced. The DC method is much better for people with Epilepsy or sensitivity to flashing lights or that get migraines easily as the on and off cycles of a PWM backlight may not appear visible to most people, even most that have any of the above conditions, but the eyeball and brain can still partly sense it causing the brain to freak out or get confused, witch can trigger a splitting migraine at the least.

[javy]

speaking of terrible jokes, our sponsor, audible.com lol

[DragonboltBlastter]

Please make a 2021/2022 version of this video? It is an interessting topic!

[ragepoweredgamer]

One day, all Linuses in all TechQuickie videos will all be the same color. Orange Linus is funny, green Linus is okay, but I prefer Linus Linus, with authentic Linus reproduction.

[HanBurritoz]

Educational, entertaining and fast. Great content!

[Neeraj-ewos]

Techquickie is the best tech learning channel

[JRobert]

Thank you for bringing up the PWM backlighting. I had to return a new laptop due to this as I didn't know why it was giving me horrible headaches whereas my old one didn't. I found a new laptop without PWM and I'm having no problems with it. Another technology for projectors is "single chip" DLP. They display multiple monochrome images every second, and depends on your brain to assemble the color image. I see the rainbows horribly (even on the newest ones) and if I look at one for more than 10 minutes, I have a full-on migraine that puts me down the rest of the day. 3-Chip DLP projectors in theatres obviously don't have this problem, just the single-chip spinning color crap does. I get disillusioned when I see DLP used in public venues such as presentations, etc. I look down at the floor the whole time. It is amazing how many people I hear complaining of eye strain and headaches. LCD technology should be mandatory in a public venue like this; but like some comments I see here; people are either not aware, ignorant, or are not affected by these flashing images; but should have respect to those who have debilitating side-effects from these.

[Phallanxdeusex]

Actually needed to pause my viewing so to commend this masterclass of a 'what to know' briefing for the ever increasing number of informed consuming customers. Impeccable.

[Brolylover]

I'm from the year 2030. I'll stick to my MicroLED 8K HDR 240hz 1ms display with no backlight, no screen burn-in and no issues with lifespan/longevity like OLED.

[CameronVerstraete]

Now I understand the reasoning behind the yellow phosphorous breaking down on my cheap 2 year old vizio now leaving me with a blue/purplish looking screen. I watched videos that explained it was the led's causing the issue, but didn't know about the led design. Thanks Linus

[Outfrost]

This is a surprisingly informative video. Nicely done!

[tnyank]

"LCD Display" Liquid Crystal Display display, common Linus!

[droy]

Linus, you're looking a little green in this vid mate.

[ilxbox]

6:18 I like how you LED us to believe you were calling Audible a joke

[omgimgfut]

if you want to know what kind of backlight your monitor uses, load up a white screen and wave your finger quickly in front of it, if the blur is smooth, your display is flicker free, if you see multiple copies of your finger in the blur, your screen flickers

[darkdancerman]

Techquickie as fast as possible please!

[ColtaineCrows]

I think you forgot to mention Plasma... Although I guess the days of the plasma screens are over.

[lilstalvi]

honestly, I wish you would have covered more display types as this was super interesting. kind of felt like it ended abruptly, but hey I guess it is techquickie.

[NOONE-iqzt]

"And speaking of terrible jokes, audible. com is NOT a terrible joke.." 😂 😂 😂 😂 😂 😂