Answer: Dear a 14 month old will have a short attention span - letting him watch the TV might seem like a pain free solution, but it generally is considered to actually make things worse.
What you should do is plan for a lot of engaging activities - almost simultaneously.
For example sitting with him on the floor surrounded by a range of different toys which do different things (eg some squeak, some are crushable, some rattle, some come to pieces, some fit inside others) and as he discards one, grab another. You can revisit ones already discarded etc.
The most important factor is that you are a part of this - talking, playing with your son, and engaging with him throughout. If you have some soft, coloured balls, throw them to him - they may not be caught, but at that age many kids like to try, even if they end up having most of them bounce off their nose/hands etc.
When he does get too bored of that, try flying him round the room in your arms, sitting him on your shoulders...this is a high effort part of parenting, which does get easier, but right now you steer everything they do so you should plan for being the entertainment as much as possible.