Led or lcd

Reason I ask is I've tried a new led screen and the image was very dîm could just make it out.
I'm not to hot on pc's so I thought I might need an LCD screen.

If the correct screen is an led what could make the image dîm.

Thanks for your reply
 
Ok, I've got it, an led and LCD screen are the same, they are both LCD but lit up by an led.

So a new question, say for instance I have fitted the correct screen but it's dim, is there an invertor to start up the led backlight??
 
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