what your trying to do can be done but is more technical then you may think
if your just using an old laptop screen you stip it down to just the lcd and its control boards, go to fleebay or what ever electronic site of your liking and look for an adapter for your lcd(look up the ribbon type it uses, the flex cable that connects the control board to the lcd circuit board) to dvi,order a hdmi (male)to dvi(male) cable, conect it all together and your in business,
or find a pc lcd like an acer p191w pc lcd(the one i use)for around $40 and git the hdmi to dvi cable off amazon for around $3-8,
then use the ps1/2/3 av cable for audio out or the digital out line for it
ive had this lcd sense new in early 2007, and the only issue ive had is the caps in the power board died last week, i had it fixed the next day as radio shack actually carries the capacitors in stock at stores for $1.49 for the 2!! and i take it every were with me on trips along with the ps3, plus it is a 1080P lcd, it is also a rare lcd that supports a wider array of input signals(you can run it from a dvd player and other devices that most pc lcd's don't normally support connection with)
here is the speaker set i use, if the power brick dies just bypass the surge protection fuse in it and it will work fine
http://www.amazon.com/Boston-Acoustics- ... 0+speakers
ive used these speakers sense 2001 when i got them and fixed the brick for free
here is my audio adapter, mine has 2 a/v splitters adapters as i run both ps3 and 360 though them(ps3 is much louder)
http://www.amazon.com/Manhattan-inches- ... o+3.5+jack
i built my first audio adapter out of old vcr and pc parts and a airisal can lid lol
here is the hdmi to dvi cable i use
http://www.amazon.com/AmazonBasics-HDMI ... dmi+to+dvi
if your going down the laptop lcd route it will be tough but this is the type of part your looking for
http://www.ebay.com/itm/like/370796204469?lpid=82
though you will have to find the one for your lcd type and plug set
there used to be a vid on YouTube that demonstrated one of these boards with a laptop lcd and a ps3 playing black ops zombie edition but i cant find it now
if your just wanting movies and ps1/ small psn games, use the non-vaio remote-play hack, you can use google for how to set up that one
and eating thrifty maid noodles because of it......seriously!?! off brand noodles.....ouch i got burned by tech support.....ouch........