In short, you couldn't use a 'screen' since they don't have the ability to perceive colors, and so the information displayed on a computer screen would be completely useless to them. You need to invent a different kind of display.
Depending on the granularity of their echolocation, what sort of display they need is very different.
If they have standard Earth-animal echolocation and use a 'ping' in order to echolocate, then they will have very basic echolocative acuity that can tell how far and in what direction something is from them. In this case, you need a completely different way of communicating information from a machine. You could use sound to 'tell' what is happening, or possible a tactile display (information rendered by altering the texture and shape of something they are touching).
If they emit a drawn out burst of sound, then they may have a finer degree of acuity in what the 'see' with echolocation (think Daredevil-like 'sound vision') If that's the case, then the texture/shape design I mentioned for something they are touching could be expanded for their echolocation to view.
That said, the amount of information that could be transmitted that way would be vastly inferior to the information acquired by sight.
So, yes...I feel this would impair their society's ability to build computers. In fact, it would impair a lot of things for the society. A sightless race would have no real way of comprehending outer space as any echolocating signals they sent 'up' would simply vanish.
That said...an echolocating race would not focus on 'seeing' things as their means of communication. They would likely focus on hearing things. Given that the amount of information that can be communicated by sound is much denser than the amount of information that can be communicated by scanning the texture of your surrounding area...it makes sense that all of their means of communication would be focused towards that. The information density of texture is very low until you start getting into microtextures...which would be hard for echolocation to reliably read.
EDIT: Here is another option if you still want something 'visual'. Use a dense array of speakers that are timed to project sound to the viewer in such a way that their echolocation perceives the sound as being something physical...basically allowing for sound-based holograms. Again, you are limited by the granularity of their echolocation, but it's an idea.