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Why USB to HDMI adapter less cuality than actual laptop built-in HDMI connector

jana
jana asked
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Last Modified: 2017-05-03
We have a couple computers laptop that has no HDMI connectors and needed to connect them to their external 55" monitors.  We purchased 2 'Insignia - SuperSpeed USB 3.0 to HDMI External Video Adapter' NS-PU37H-BK USB-HDMI adapter in  order to have them connected to their respected external monitor.  It works fine but we noticed that if we connect said monitor to a laptop that DOES have HDMI connector built in, the monitor resolution permit to make the character smaller and more define.

Why the diference in resolution?

Also, do we have to purchased another type of USB-HDMI adapter in order to get  the external monitor true resolution?
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Commented:
What resolution have you set in each case?

Author

Commented:
We  didn't set any resolution, just connected the cable.  Strangely enough we notice  that the resolution in both laptop, when connected to the 55" external monitor, is 1920x1080.  

Is it within Windows configuration?
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Commented:
"the resolution in both laptop"
This is the resolution set for the laptop screen or for the external monitor?

Author

Commented:
external monitor.

When we said that we notice  that the resolution in both laptop, we meant that when going inside the laptops display settings while having the external monitor connected it display the same resolution.  we are not referencing to the laptop actual screen resolution.
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Commented:
"it display the same resolution"
When you have two monitors attached, there should be TWO (possibly different) resolution settings: one for the laptop display and one for the external display.  Please report on what setting you find on each of them.

Author

Commented:
Maybe we are not explaining correctly, will try again:

- we have users whose notebooks also are used connected to a external monitor 55"
- the connection are via a HDMI cable and both computers have HDMI ports
- these external monitors are exactly the same model
- when these monitors are connected to their respective laptops, we look at the Display Settings and the resolution is 1920x1080
- all is working well up to this point

Now,
- these users were given new notebook  but none pf the new computers have HDMI connector
- we purchased 2 'Insignia - SuperSpeed USB 3.0 to HDMI External Video Adapter' (No. NS-PU37H-BK USB-HDMI)
- when we connect the external monitor to the new computers, the image seems low resolution
- however, in their respective laptops, we look at the Display Settings and the resolution is 1920x1080

Questions:

Why the difference in resolution?

Also, do we have to purchased another type of USB-HDMI adapter in order to get  the external monitor true resolution?
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Commented:
"we look at the Display Settings and the resolution is 1920x1080"
This is where I'm not being clear.  There shouldn't be "the" resolution.  There should be two resolutions, not one.

"the image seems low resolution "
If the resolution being sent is truly 1920x1080, then I'd be concerned as to whether or not the timing is correct.  This is not something you deal with on digital interfaces such as these, but I could imagine that there is some issue there.  If the "pixels" being sent out on the HDMI connector don't line up (timing errors) with the pixels on the physical display, the screen will look blurry.  "Lower resolution" may not be the correct term, but it will look very similar.

Are these 55" monitors or TVs used as monitors?  I've seen many issues with TVs where it is difficult to get rid of over- or under-scanning.   That will cause the misalignment to which I'm referring.  There may be settings on the TVs to adjust for this or for the alignment.

What is the make and model of the display you are using?

Author

Commented:
"we look at the Display Settings and the resolution is 1920x1080"

- we mean the resolution that appears when external monitor is connected.  We are not referring to the resolution of the actual laptop display.  This question is only related to the external display.

The resolution refer is Display Settings.

display
The monitors are TV and also used as monitors with picture in picture.  Remember, in the notebooks prior the same monitors were used and no problem.

really we are expressing our problem (nevertheless, we are still searching for a solution)
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Commented:
Thank you for answering the question about resolution.

What is the make and model of the monitor?
Commented:
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To be clear, the image on the screen wasn't just blurry, it was significantly larger than on the other large screens?

Author

Commented:
Never said it was blurry, but yes, it was significantly larger data on screen.

Author

Commented:
Chose our solution since it solved the  problem.
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Commented:
Your solution seems to be the appropriate one.

What threw me off (and made me think "blurry") was the title that implied there was less "cuality" (quality) in the image.  I assumed (incorrectly, I now realize) that this was incorrect.

Author

Commented:
Yes, just reread the title and it was misspelled also hahaha... "cuality" its quality.
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