[Touch HD Accessories] hi2alans:
I wasn't an LCD expert but certainly not a newbie.

How am I to know? I can only respond on what you write. I too am not specifically an expert in LCDs but work day in day out with Hi Tech electronics including miniature circuits and SMT devices and boards. I answered in the spirit of your request

Like I said earlier, I used the wrong word in liquid. I didn't even state it was the LCD liquid, just liquid.

Where would liquid come from. The only liquid is in the LCD. So the use of liquid is, as you say, not correct.

I only used liquid initially as that's what I remembered it look like weeks ago, a multi coloured liquid when you squeeze it. I've dealt with broken LCD's when replacing laptop/handset screens and seen the oily look when it is ruptured but that looks different.

Again, the original post is misleading to anyone reading, many do not have your level of experience with LCDs. A more considered description when you are asking for help will help with a more accurate response.

I think you've misinterpreted my last post, my point was that if it was an air bubble then it would have behaved differently. Pushing towards the 'air bubble' as I did would not make it simply vanish and it didn't go through any layers either. If it was an air bubble then I'd simply push it outwards just like you would on a screen protector for example

Clearly, as it was very open to misinterpretation.

You cannot completely discount my suggestion either and I would have been happy to enter into a constructive discussion with you on it.

Large very flat and fairly rigid surfaces stuck together can do surprising things. You cannot compare that situation very well to a screen protector as the screen protector is very thin and flexible and most are prone to stretching allowing bubbles. I have used the Zagg protector which is actually gas permeable like soft contact lenses are nowadays. So bubbles disappear on their own.

Certainly the permeability of the individual layers to air is also something that we can only guess at and so you again cannot say with certainty that air cannot leak in or out through the layers.

It's the fact that layers have been compressed together, even distorted slightly and sticking together, that creates the black spot. It's then the lack of whatever it is (most probably air) between the 2 affected layers (whichever ones they are, possibly something to do with digitizer layer pictured below) causing the problem. Hence squeezing towards it helped get rid of the pressure spot caused previously ;)

I do agree with this entirely, it is in very real sense, the exact opposite of a bubble, i.e a stuck spot with an air bubble around it (that air layer should probably be there).

Moving it around means that you are moving the air bubble around the stuck spot. Bearing in mind there is likely to be a small gap due to the use of an adhesive layer (I avoid the use of the words "double sided tape" although this is most likely) between the digitiser and the LCD.

So the possibility to create the dark spot by pressing on it removing the air and then those layers sticking is realistic.

It will then behave in a similar way to a bubble and will also need the opposite of a bubble, i.e. some air entering to fill up the gap (a partial vacuum) between the layers.

if you don't believe me, be brave and put the phone on a hard surface and then gently but firmly push on your screen with your finger (easier to see while screen is completely dark) and you will actually see the exact same kind of spot appear because you are compressing the layers. It flexes back OK as you are not putting enough pressure on to completely distort it, just enough to see the effect. I say this as I've just been testing what kinds of pressure applied does what and the pressure spots seem quite near to the outer screen. They seem to be around the same level as the dot matrix as you can then see them more clearly when you squeeze it in the right place.

it's certainly not an air bubble ;)

:eek: Please nobody even consider taking this stupid action as you may well cause expensive or irreparable damage... YOU HAVE BEEN WARNED :eek:

p.s. It's also nice to be in the situation of being able to be cavalier about ruining a £500 phone or spending £70+ to repair it on a pointless experiment.