Why does the LCD have black spots?

Thanks for your response, Dan!

While replacing the HDD with my new SSD I took the opportunity to thoroughly clean the insides if my iMac to get it to look brand new now as compared to the picture above - the back of the LCD panel visible in the picture which is black got back to the aluminium colour it was supposed to be and I blew a ton of dust out of the system so that is all “done and dusted”.

As you’re saying the display panel has nothing but dirt inside it causing the black spots, is there a way to fix it by opening the panel and cleaning it instead of replacing the whole display itself?

Its a lot of work! And its a less than 50% chance to be working in the end ;-{

Heres the first part iMac Intel 20" EMC 2133 and 2210 LCD Backlights (CCFL) Replacement and then you need to lift out the panel to get to the back side to clean it and clean the defuser sheets without damaging anything in the process! Four to five hours work.

Oh, okay!

So if I do plan to replace the whole display then is it possible to upgrade the display with a different/better panel or will only this display be compatible with this iMac?

Also, if I do need to get this exact display then I may have to find alternative stores from where I can buy it since on the website above, shipping charge to India is more than the price of the product itself. :(

Sorry there just isn't any better display. You need to stick with what Apple used.

Oh okay! Thanks for you help, Dan. Appreciate it. :)