Using a 4k TV set as a computer monitor
TL;DR Answer: Yes, a 4K TV set works as a computer monitor
with some caveats, of course.
Who is this focused on?
This article is targeted to home and office professional computer users,
doing things like word processing, programming, spreadsheets, database,
and other business related uses. I'm assuming your monitor is on your
desk, no more than three feet (one meter for my metric readers) from your
It is NOT targeted at gamers or people wanting to share a large
screen monitor with their computer from across the room (these
people will probably not want to run the monitor at 4k resolution).
I'm also not targeting those that might want a big screen monitor
due to vision issues (hey, it will work, but I'm not an expert on this
It is also not about ultra-high resolution monitors of modest size.
While a printed page has commonly had 300 dot per inch resolution now
for well over 30 years, the monitor has historically been limited to the
70-90 dot per inch resolution. There are new monitors on some laptops
that have blown through the 100DPI resolution and are approaching the
resolution found on good laser-printed pages. This is a highly noble
goal, but again, it isn't what I'm talking about here.
Short version: because multiple monitors are great, but they really
boil down to being a "big monitor" scattered over a few screens.
Why not just have a big monitor? A single 4k monitor is 3840x2160
dots, which is exactly the same as four common 1920x1080 monitors
arranged in two across and two vertically. And a 42" TV is about the
same screen space as those four monitors, arranged 2x2.
So...using a "4k TV" as a computer monitor seemed to be a logical step
Modern TVs are "smart" TVs
You may have noticed, it is often cheaper, or at least not much more
expensive, to get a big TV screen than it is to get a much smaller
computer monitor. Yes, something is going on. Smart TVs aare
by selling information about you to advertising companies. By using it as
a computer monitor, you are not broadcasting information about yourself to
the makers, so don't expect them to make your life easy to use the TV as a
monitor. I'm not saying it is terribly difficult to use a TV as a monitor,
but be aware there are some issues.
One of the big issues is they really want to be attached to the Internet.
I've yet to meet one that absolutely insisted on that, but often in the
initial setup, it will moan and whine about please hook it up and "register"
it. UNLESS you want to also use it as a "smart TV", don't.
Power Switch and Remote
Modern TVs are run by remote control. Most "smart TVs" live off their
remote. Many don't even have a power button on the TV itself, lose that
remote, you have a dark black monolith. This is annoying. IF you have
a choice, try to get a TV with at least a power button...but you
may not have a choice. I have three 4k TVs, one has NO power button,
one has a push button that, by holding it for various amounts of time
can do various things, one has a "wobble" button that can be used to
select menu functions...clumsily. The one with the wobble button
runs very nicely without the remote -- push the button, it turns on.
Push it again, it turns off. PERFECT. I hardly ever touch the remote.
The one with the simple button
turns on easily, but turning it off involves pressing and holding the
one button for the right amount of time (guided by what is on the screen),
so it usually gets turned on by button and off by the remote.
Unfortunately, it is hard to know what you will be getting. When I
bought my first 4k monitor, I was in a time crunch, so I ran to Walmart,
looked at their choices, found the ONE model they had that actually had
a power button, bought that model ... and found it had changed, that model
no longer had a power button.
The two I have with buttons, one it is smack in the
middle of the bottom of the set, behind a distinct logo. Great.
The other is off-center, with absolutely nothing indicating where the
button is, at least until I put a sticker in front of the button to help
me find it.
I have not seen this yet myself, but I suspect soon, we will be seeing
"smart TVs" without remotes, that use your phone to control the TV.
Avoid these. This will probably require that the TV be attached to the
Internet. This will cause problems for a computer monitor.
For the last 30 years, many of us have got used to not actually hitting
the power button on our monitors. We turn them on, then when the computer
sends a signal, they light up. When the computer stops sending a signal,
they go into a very low power mode, 99% "off", but will quickly become
active again when the compuer sends a signal.
Apparently, "smart TVs" don't work this way. I have seen signs that
some smart TVs will turn on when presented with a video signal, but none
of mine do that. Mine will turn off after many minutes of no video
signal, but the time is five to fifteen minutes, not "near instant" that
I'd like. And in my TVs' cases, "off" means OFF. They will NOT fire up
when the computer is attached or is powered up...it must be done by me
(either button or remote).
This also leads to problems when you aren't using your computer for a
while and the computer goes to "sleep" or blanks the screen, your TV may
turn off...and STAY OFF when you hit the keyboard or jiggle the mouse to
get its attention. So you may find yourself manually turning the
monitor back on when you come back to your desk. This can be a bit of a
problem if you have other monitors than JUST the big 4k monitor, as
Windows will detect the monitor being off as a monitor unplugged, and
will reconfigure the displays to a config without your big (and probably
most used) monitor, which means all your carefully organized windows
will be everywhere but where you left them.
An easy fix for this is to disable the screen blanking on your computer.
One down-side of a big, 4k monitor over multiple conventional sized
monitors (and this is not a "TV vs Monitor" thing) is organizing your
work. Even though you can move the mouse and applications between
screens on a multple-screen computer, the OS typically applies a little
bit of logic, and will generally default to keeping an application on
one screen unless you manually enlarge it beyone the one screen.
I'm not the most organized person, and I very often find myself looking for
an app that has got burried under five other applications. On the other
hand, I know people that keep a big monitor very well organized.
The "Seems Right To me" size for a 4k monitor-as-TV seems
to be 42-43inch. I also have a 50 inch TV, but it just seems a little big
to see all the screen easily.
42-43 inch is almost exactly the screen space of four 23" 1920x1080 monitors,
almost exactly the same dot size.
50" just seems a little too big for me.
BUT you may disagree. IF your eyes focus best a little further away than a
normal monitor, you may want a 50" or even bigger set, and place it further back on your desk.
My 50" TV is over a foot away from the wall behind it, so the screen is about
the same distance as most of my other screens. If I slid it back, I'd probably
appreciate the 50" more (but then, that's not where my vision is optimal).
Your mileage WILL vary here. I'm just offering a guideline.
Will it work with my computer?
IN MY EXPERIENCE, most computers made in the last four or five years
work just fine with 4k monitors or 4k TVs used as monitors. I have
some much older ones that do as well -- I have tested a nine year old
netbook that had an HDMI port on it, and it drove the 4k monitor just fine,
though a somewhat newer and much better laptop did not. But so far, everything
I've tested within "office refresh" age (3-5 years) has worked great with a
4k TV or monitor. You do need either an HDMI or Display Port output. Your TV
will almost certainly have an HDMI input. HDMI to HDMI cables are dirt cheap,
DisplayPort to HDMI cables are a little more expensive, but not bad at all.
Will it work with my operating system?
Windows 10 defaults to a 300% magnification with a 4k monitor, I'm
guessing this is due to wanting to make sure you can read it if your
monitor turns out to be "normal" sized. Fine, but you will probably
want to knock it down to 100% so that you get the benefit of four
monitors screen space and dot count.
I've used it on OpenBSD, which also Just Works. If your primary/only
monitor is a 4k display and your hardware supports it, it should just
take off and run. If your monitor is attached at boot as a secondary
monitor, it should also take off and work, but you might need to use
xrandr to position the
monitor as you desire.
Do I need an expensive cable?
HDMI and DisplayPort are digital signals. They either get throught the
wire or they don't. Yes you can get a garbage cable that won't work, but
spending crazy amounts of money for gold plated stuff is cheating
yourself. Not only will you not see the difference, there's no
difference to be seen.
Yes there are garbage cables out there. Unfortunately, I'm not sure of
a good way to identify a cheap cable that is just fine vs. an expensive
cable that is junk.
Get a stand
One problem with using a TV as a computer monitor is the stand that
comes with the TV is generally designed to stand on top of a surface
with little clearance between the surface it sits on and the bottom of
the screen. I find this too low -- I like having my nose at
approximately the center of the screen. On my first 4k TV-as-monitor
setup, I put the TV up on some books to raise it up. I found a much
better solution with something like
These give you some flexibility about how high the monitor is above your
desk AND give it more stability. They also give you the ability to use
the space on your desk immediately under the monitor. Something like
this is highly recommended. (I do NOT get any kind of compensation
if you buy one of those. I have a couple of the pedestal stands,
and am quite happy with them. Have not tried the two-leg stand).
Selecting your TV
Typically, a TV is viewed from many feet away, if not across a room. A
computer monitor is viewed from a very short distance. One thing I have
found that is different between monitors is viewing angle. LCDs are
somewhat directional by nature, so if you are sitting towards the left
side of the monitor, when you look at the right side, you may see some
color and intensity differences. So when you pick your monitor, put
yourself at viewing distance on one side, then turn your head and look
at the other side. One of the TVs I have has a minor issue with this;
$180 for a 42" 4k TV, I am not complaining, it is 100% usable, just
something I notice, and I kinda wish I had looked harder at the $20 more
expensive one -- if it had a better viewing angle, it would have been well
spent (and if it didn't, would have been wasted).
What TVs do you have, Nick?
I have three. I'm not going to provide model numbers, because even when
the model numbers are the same, I've found differences, and my most recent
purchase was a closeout anyway. The others are all a couple years old at
this point. Anything I tell you about mine may or may not apply to the same
brand and same marketing model number...and most likely, you can't find
the same model at this point anyway.
I heard TVs make horrible computer monitors!
Until the modern digital TV, yes, that was true. The technology of
broadcast TV was developed in the 1940s, and it showed when you tried
to attach a high resolution computer to them.
This is not true of modern digital TVs. There are some purposes for
which a very high end computer monitor will do better for you than a
TV used as a computer monitor, but in terms of sharpness of image, the
modern TV set will be sharper than even the best CRT computer monitor
Don't I need a faster refresh rate than a TV will provide?
For games and maybe some action videos, perhaps. But for office use,
a 30Hz refresh rate is fine.
Again, if you have been in a computer user since the 1990s, you might
cringe at the idea of a 30Hz refresh. But remember, LCD monitors and
old CRTs are different beasts. A CRT monitor that is running at a 30Hz
refresh means the beam draws out the entire picture 30 times per second.
Only one spot on the screen is lit at any instant, so the screen is
fickering and quite annoyingly, unless that rate is 60Hz or better. LCD
screens do not flicker as part of drawing the image. When you see a
computer driving an LCD and refreshing only 30 times per second, the
entire image is being updated 30 times per second. It isn't flickering,
it's a steady image from one refresh to the next.
So for eye strain and such, refresh rate doesn't matter. For games and
action stuff, it may...but as I said at the beginning, that's not my
use case here.
I did find in one of my environments, the only one that supported a 60Hz
refresh on the 4k monitor, the image looked sharper at 30hz than 60hz.
I'm not sure if that was my dock station, the monitor, the cable, or the
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