iPad display is a bastard screen size - Picture courtesy Mad Mike Mageek

We know that Apple is using its own PA Semi processor in the iPad that drowned out all other news yesterday, but now we're beginning to see the other elements involved in the Apple pie.

We don't know which semiconductor company is fabbing out the PA Semi in Mr Jobs' machine, but it's probably, probably TSMC. Maybe Paddy Power should open a book on which fab is making the chip. We wonder what the yields are like. We note that two ex-CTOs of ATI - one of them pictured here, works for Apple now but when we took the snap worked for "someone else". Wonder what the yields are like? Raj ain't gonna say.

They'd have some clue what's going on, but Apple has inserted a device next to their heart that would fibrillate like hell if they opened their mouths or even tried a bit of semaphore, never mind talk to their old chums. So feel safe Apple, feel safe.

Now DisplaySearch, the market research firm that knows about these things, has come up with its ideas on the display used in St. Jobs' glory and wonder.

It has a 9.7-inch 1024x768 LED backlit in plane switching (IPS) TFT LCD display. Apple chose it because it uses IPS and has a wide viewing angle.

Apple has also claimed, says DisplaySearch, that it has the largest capacitive multitouch displays with thousands of sensors.

But the display is not a wide aspect ratio screen - it's unique in having an aspect ratio of 4:3. Ninety nine percent of notebook PCs use wide displays and it's hard to find an LCD TV with anything other than a 16:9 display.

DisplaySearch believes that Apple chose a middle ground between the need for books, magazines, newspapers, video and gaming.

In old fashioned British printing terms, it is a "bastard size".

Oh, it's arsenic and mercury free - one of the benefits of LED backlights. Wonder who is fabbing out the screen for Apple.

Doubtless, iSuppli will sooner or later get its mitts on one of the posh e-readers Apple is flogging and rip it to bits - revealing the component cost isn't very much at all. The DisplaySearch bog is here.