Laptop display extremely dim?

Recently my laptop screen went dim - so dim that I could not see the image until it was in the sunlight, and even then I could just make it out. I left it for a couple of days and it returned to full brightness, so I thought it was working. Then it turned dull again and I wiggled it about and it returned to full... show more Recently my laptop screen went dim - so dim that I could not see the image until it was in the sunlight, and even then I could just make it out. I left it for a couple of days and it returned to full brightness, so I thought it was working. Then it turned dull again and I wiggled it about and it returned to full brightness again. I keep going round in circles with it, does anyone know what it could be and how I would repair it?
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