Using a 4K ultra HD TV as a PC monitor

LG 43UK6950 PLB (4K Ultra HD TV)

Over the last couple of months I’ve been considering buying a TV to also use as a PC monitor. I’ve been surprised to find relatively very little information online about it so here’s what I’ve discovered and my experiences so far.

My experience has been great, so far.

You don’t have a telly?!

I’ve often been amazed by people’s reactions whenever I’ve told them that I don’t own a TV.

“You don’t have a telly?!”

Until recently I’ve not felt that I’ve really need one. I do have a TV licence as you still need one to watch shows on the BBC iPlayer but I watch those on my PC or Android tablet.

This is fine on my own, but watching films with my boys has been tricky. Most often we’ve been lying down, scrunched up, watching my laptop at the foot of the bed.

Moving out of hall into my own wee house added new dynamics, so I finally gave in and decided to buy a TV.

As I don’t have much space in my house and wouldn’t have anywhere to put it other than on my desk, I knew that it would have to double as a PC monitor.

So I knew my research had to cover two areas:

  • Graphics cards
  • 4K Ultra HD televisions

Graphics card

Put simply, a graphics card is the technology inside a computer that creates the images to output to a screen. Generally speaking, the better the card, the better quality the images and the higher resolution it can handle. This is especially true if you play computer games. The better the graphics card, the more detail you see and the smoother the games appear to play.

I had quite an old graphics card, an NVIDIA GeForce GTX 660 (2 GB) which at the time I bought it was only a few notches down from the top-level gaming cards available. It used a PCI Express 3.0 slot, had two GB of RAM and supported a maximum digital resolution of 4K (4096 × 2160) which was fine for my dual-HD monitors setup (3840 × 1080). It served me well for four or five years and was exactly what I needed then.

But it was beginning to struggle with a few of the more modern games. Forza Horizons 3, for example, we were running on the lowest specs available within the game and even then it was complaining that the graphics card wasn’t coping.

This article from PC Gamer was very helpful in helping me identify the kind of graphics card to upgrade to:

You can use any TV with HDMI inputs in place of a computer display. If you’re looking at 4K TVs, you’ll want a graphics card with at least an HDMI 2.0 port (HDMI 2.0a or later for HDR10 displays). That allows for 4K at 60Hz, with 24-bit color. For GPUs, all the Nvidia 10-series parts and the GTX 950/960 can do this, and AMD’s RX Vega 56/64 and 500-series cards also support HDMI 2.0 or later.

Should I use a 4K TV as a computer monitor?

After a little research, I upgraded to an NVIDIA GeForce GTX 1060 with 6 GB of RAM. Another PCI Express 3.0 card but this time with an overclocked processor (so that it runs faster), three times as much memory, and support for 8K resolution (7680 × 4320 pixels). It also had the outputs that I needed (DVI and HDMI), giving me plenty of options.

That should do the job.

Top tip: I used PC Part Picker to identify graphics cards that would be compatible with my motherboard.

Asus NVIDIA GeForce GTX 1060 OC Edition 6 GB graphics card

It took me about 10 minutes to remove the old card and install the new. I then downloaded and installed the latest drivers.

What a difference it made. On my 24″ HD monitor, I was able to run Forza Horizons with everything cranked up to high or ultra!

Time to choose a television.

4K Ultra HD TVs

While researching whether you could feasibly use a 4K TV as a monitor, besides the advice about using HDMI 2.0a, I discovered two further considerations:

  1. Signal lag
  2. Chroma subsampling 4:4:4

Signal lag

One of the biggest differences between traditional PC monitors and televisions is input lag. This makes sense as the only input a TV generally needs to consider most of the time is from the remote control, and most of us will happily wait for a second or two while the channel changes.

The only other time that most TVs need to consider input lag is when you plug a games console into it. When you tap left on your gamepad stick you want your character to move left immediately.

As a lot of modern TVs process the video signal to make the action in films look smoother, you need to switch this off when plugging in a games console or computer. To enable this, most TV manufacturers now include a ‘game’ mode.

This is important when connecting a PC to a TV because without game mode enabled even simple things like dragging your mouse across the screen shows a noticeable lag: you move the mouse—there is a slight delay—the pointer eases itself across the screen. It doesn’t take too long for this to get annoying.

4:4:4 chroma subsampling

Because TVs are designed for watching fast-action images they are not so good at displaying the sharp text that you might want to manipulate while using a computer.

So if you want to use a 4K TV as a monitor, we need to make sure it is capable of displaying sharp text. TVs manage this using something called ‘chroma subsampling’, although most of the documentation and specifications of TVs—disappointingly—won’t call it this. You may have to do some digging around in user manuals.

This article “chroma subsampling 4:4:4 vs 4:2:2 vs 4:2:0” explains the importance of 4:4:4 chroma subsampling better than I ever could, but the thing to remember if you want to use a 4K (ultra HD) TV as a monitor is that it must support 4:4:4 chroma subsampling.

For moving images such as TV shows and movies this isn’t critical, 4:2:2 and 4:2:0 do just fine, but for displaying crisp text—which most of us use our PCs for manipulating—it is essential that you have a screen that supports 4:4:4.

I had to do a lot of detective work to figure this out for most of the TV models that I looked at. It is rarely included in the at-a-glance specifications for each TV. I often had to find the model on the manufacturers’ websites, download the manual and search through it.

It turns out that most modern television sets will support 4:4:4. After a lot of reading, I discovered that each manufacturer has a particular way of describing it.

  • Sony TVs call it “HDMI enhanced format” and require you to set the picture mode to “graphics”.
  • Samsung TVs call it “HDMI UHD color” and require you to select “PC” mode.
  • LG TVs called it “HDMI ULTRA HD deep color” and require you to set the picture mode to “game”.

My experience so far…

LG 43UK6950PLB—43″ Ultra HD TV

In the end I bought an LG 43UK6950PLB, a 43″ ultra HD TV with four HDMI inputs (including one ARC) and built-in Freeview and Freesat tuners.

I have plugged into it:

So far, my experience with the TV as a monitor has been great. 

Picture mode is set to “Game” and “HDMI ULTRA HD deep color” is set to on for the input to ensure 4:4:4 chroma subsampling.

Within Windows’ display settings, I also have the HDR (high dynamic range) and WCG (wide colour gamut) setting set to on.

HDR and WCG settings screen
HDR and WCG set to on

Forty-three inches is a good size for my desk. If anything, it is a little large and a curved model may have been better (though I can’t see any smaller than 49″).

Picture quality has been superb. For writing and reading text documents and browsing I have no issues.

There is no discernible input lag on any of the games we’ve played (mostly LEGO, Call of Duty Black Ops, Fortnite, Overwatch and Forza).

As indicated above, with game mode enabled there is little noticeable lag when moving the mouse. Until the recent WebOS update on the TV (v4.10.04), sticking the TV into any other mode (eco, sports, vivid, etc.) made it look like the mouse was slowly gliding through water; the latest update seems to have reduced the latency on other picture modes.

And with the NVIDIA GeForce GTX 1060 pushing the graphics the quality has been wonderful, with every game on high and/or ultra settings.

I would definitely recommend making the switch from HD monitors to a 4K ultra HD TV.

Update after 11 months

TL;DR Sometimes I get no signal when I switch on, so I cycle the power on the TV.

After almost a year, things are still going great with this setup. The only weird thing I’ve come across is that sometimes when I switch the PC on and power-up the TV from the remote control, I get no video signal. Or at least, the TV complains that it doesn’t have one.

My workaround is to simply switch off the TV, wait a few seconds and switch it back on again.

I have no idea what’s going on. This issue could, of course, be isolated to my combination of TV and PC graphics card but the workaround resolves the issue. Which is a relief as I always feel a little skip of my heartbeat when it happens.

Published by

Gareth Saunders

I’m Gareth J M Saunders, 52 years old, 6′ 4″, father of 3 boys (including twins). Enneagram type FOUR and introvert (INFP), I am a non-stipendiary priest in the Scottish Episcopal Church, I sing with the NYCGB alumni choir, play guitar, play mahjong, write, draw and laugh… Scrum master at Safeguard Global; latterly at Sky and Vision/Cegedim. Former web architect and agile project manager at the University of St Andrews and previously warden at Agnes Blackadder Hall.

17 thoughts on “Using a 4K ultra HD TV as a PC monitor”

  1. Wow, how awesome it is to see an article in my inbox for which I had been searching myself.

    The Input LAG that you talk about, is it a game-only noticeable thing, or lets say when you move your mouse too while just reading a document? That should not be the case, right?

    “This makes sense as the only input a TV generally needs to consider most of the time is from the remote control, and most of us will happily wait for a second or two while the channel changes.” Well nope… A reason enough for me to dump the set-top boxes and Tellys and rely on Internet, Youtube and Amazon Prime. We have skipped buying/watching TV for over 10 years so as to avoid advertisements elongating a nice 1.5 hour movie to 3 hours and wasting lot of time. On PC we can binge better 😉

    Thanks for info on 4:4:4 it can be one of the most important factors for using 4K television as a PC monitor. The sales people in the malls don’t even bother going through the specs with me.

    And, is the housing really uber expensive in your part of the world? Although its not cheaper anywhere but just inquisitive.

  2. Thanks Kzzircuit, and good point about the mouse lag. I’ve updated my post to include this. As I now say in the article, “with game mode enabled there is little noticeable lag when moving the mouse. Until the recent WebOS update on the TV (v4.10.04), sticking the TV into any other mode (eco, sports, vivid, etc.) made it look like the mouse was slowly gliding through water; the latest update seems to have reduced the latency on other picture modes.”

    I hope that helps.

  3. A very useful article. I’ll be checking my display modes and options when I next use he tv for work or gaming. I’ve been using a tv as a monitor for several years, initially a 720p cheap Cello from Sainsbury’s and now a 4K Samsung. The 720p tv made the text a bit fuzzy but the 4K tv displays it crisply, for both my 2014 Mac mini and similarly aged Lenovo Thinkpad – neither of which have the greatest graphics chips.

    I really can’t understand why anyone would pick a monitor over a 4K tv these days. TVs are much cheaper…and you can watch TV on them!

  4. Hi. Does you LG 6950 have what looks like slightly recessed panel? When you look at it straight from front as on PC monitor and look towards the edges, do you also see curving and distortion there? I have Samsung 4k telly too and that does not suffer from what looks like a recessed panel behind front transparent layer…

      1. My LG 43UK6950 looks like that the LCD is not aligned with the front transparent layer but it looks like there is a gap – like on cheap tablet without laminated screen. And then, it looks like the edges are curving in and the very borders and are distorted when looking at it from centre towards edges. The elements like the scrolling bar at the edge of the internet browser, edge of the screen, are distorted because of this gap and what appears like the display is curving in at the edges. I will try to photograph it…

        1. Vit, the gap you are talking about is between the LED (back light) and the LCD layer (the display itself). on TVs, it seems a bit too large about 0.5cm and true it is annoying and gives you the false impression you described around the edges.

          To resolve this issue, what you need to do is just reduce the resolution of your TV through your graphics card to switch off the display in the smallest area around the edges (1cm would suffice). Go to your graphics card properties config/resolution and create a new personalised resolution for example 3760×2160 or 3760×2080). The problem will then disappear completely as the area around the edges will be switched off and the LED and LCD layers appear overlapping like on ordinary computer monitors.

  5. Thanks for your review Gareth. I have a few questions if possible.
    Your LG TV display panel includes what is known as RGBW subpixel structure instead of the more common RGB like the one used by Samsung or Sony. Doing my research, it is reported that the RGBW introduces some fuzziness and loose some sharpness in the text (please see linked image If you zoom into the image, you can see that the straight lines are not really straight but wiggly. Have you noticed such a thing in your experience? What is the windows text size you are using? is it 100% or greater like 125% or 150%.
    Many thanks in advance for your feedback.

    1. Hi Abdel, thanks for your questions. I’m running it at 150% — recommended is 300% and I have not noticed any such fuzziness. Out of interest, I just bumped it up to 300% and, again, the text looks clear and crisp. At 100% my poor eyes struggle a little to see text. I’m trialling it at 125%.

      I’ve been really happy with this screen. Highly recommended still.

      1. Hi Gareth,
        Thanks for your swift reply. I did not get a notification for your reply until I checked your article again myself.
        300% is too much for me, I would loose the real estate of the 43” screen which is what interests me in the first place. Ideally for me 100% mode (4 x 21.5″ FHD monitors) if I can manage the size of the text. If not, then 125% which would be equivalent to about 2.5 x 27” FHD monitors (about 82~83ppi resolution). I worked with 27″ FHD monitors in the past and the size of the text was ideal.
        How do you find 125% so far, is it as good as 150%?

        1. Hi Abdel, you should have the option to “notify me of follow-up comments by email”.

          To be honest, I had forgotten that I’d set the scale to 125%. My eyesight is not the best but I’ve found this scale to be very usable.

  6. Hi Gareth,

    How has your experience been sitting before the screen for hours at a strech? Do you experience eye and neck strain in comparison to a regular pc monitor?

  7. Hi Gareth, I have only just stumbled across your article (great read BTW) and wondered if you’ve managed to locate a proper Windows 10 driver for the TV?
    I have the same TV and run it as a second monitor from my R9390X over HDMI. The thing that bugs me is that Windows 10 recognises it as a LG TV but the driver is only picking up “generic PnP monitor”. I’m sure that’s not making the most of this great display as the refresh rate is limited between 24 and 30Hz.
    There’s nothing obvious on the LG site or forums.

    1. Device Manager

      Hi Mick, thank you for your comments and compliments. Do you know, I haven’t thought about this since I first set up my TV. As you can see, I’m running an NVIDIA GeForce GTX 1060 and like you, Windows 10 recognises it as an LG TV and also simply lists this as “Generic PnP Monitor”.

      I run the TV in Game Mode and HDMI Ultra HD Deep Colour for the HDMI port connected to my PC. That’s been fine for my requirements. Sorry I can’t be any more help.

  8. Found this article yesterday and found it most useful!!
    I had been using a Sonia Bravia 1080P TV as a monitor for my Mac mini and wanted to go 4K
    Mounted a 55″ LG 4K TV yesterday afternoon using the suggested settings and it works a charm – beautiful – no lag>
    I actually think the Mac prefers a 4K screen.

    Thank you

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