MicrobeHunter.com Microscopy Forum

Hello, I would like to ask you one question.

We have reflective microscope where we can see LCD TFT structure without problem. But there are some TVs where we have problems to see it. Just after iris open is minimum and it is not very good visible. We know that it is not problem of ccd sensor. It must be problem between lamp and objective.

I think there is absorb layer as in "ultra black" technology in samsung. Do you have some experiences with this problem?

Or do you have some suggestions how to solve it?

Thank you

I don't know much about the topic, but it would be helpful if you could provide the model numbers of the panels you are comparing, and some information on your microscope settings / how you are observing the panels. That might help point us in the right direction.

Just a thought, but one thing to consider is that some TV panels use polarising films (sometimes multiple layers of it) which could inhibit the view. If you have a polariser/ND filter in your microscope you can try removing it or rotating the subject to see if it makes any difference.

Sorry for poor details.

We have very poor microscope for this purpose. There is possible to set up just iris and dim light.

Here are some details:

1. We know that it is not problem with polarizer, bcz if we have some models with another polarization it is enough to change direction of LCD cell from X to Y axis.
2. One difference against other models is that it contains something like this https://www.samsung.com/global/tv/news/ ... echnology/
3. We have another reflective microscope were we can see structure very well, but parts of microscope cannot be changed between each other.

But we cannot find where can be problem, in which part.

So I would like to ask you what can be the problem?

a. light source = lamp? can it be caused by another wavelenght of light. Angle of light coming to cell is the same 90 degrees.
b. some special filter?
c. objective?

Thanks

Please give some more specific details about the one that works and the one that doesn't.
This is an interesting problem. I would like to know more.

From the linked article:
. .

I’m sure this is the essence of the problem
... Photographing through that surface, using an external light-source, should [ by design] be almost impossible.

MichaelG.

Ok, I am sharing some settings with you.

Images 12, 16, 22 are for microscope with more settings,there is possible to see structure.

And images 66, 84, 87 are for microscope with setting just for iris and dim light.

Rest images.

My guess is that, to see through that surface, you will need to use true axial illumination and the shortest available wavelength of light.

MichaelG.

Thank you for reply. Light source we will try to change and I will share result. But how to make true axial illumination?

trala wrote: ↑

Wed Jul 01, 2020 12:55 pm

Thank you for reply. Light source we will try to change and I will share result. But how to make true axial illumination?

.

The ideal solution would probably be a different microscope stand, but it is also possible to insert a conversion at the objective mount.

I will try to find a diagram of this arrangement for you.

MichaelG.

.

FOUND ONE here: http://www.microscope-antiques.com/watsonvertill.html
... scroll down the page.

I am sending you more detailed info about objectives:

worse objective: https://microscopecentral.com/products/ ... -378-825-5

better objective (clear visible): https://www.olympus-ims.com/en/microsco ... ntent11429

Wow !
... I never expected to see a Mitutoyo objective described as worse.

There is obviously something interesting going-on.

I think the clue may be in the Olympus product description:

Olympus' LCPLFLN-LCD lenses are optimal for observing specimens through glass substrates such as LCD panels. The adoption of optical correction rings allows aberration correction according to glass thickness.

... Which would be a specialist version of this:
https://www.olympus-lifescience.com/en/ ... orrection/

MichaelG.

I already tried it, it has no influence on it.

But width of aperture is very diffrent as you can see in dimensions. One have around 12 mm and another 24mm.

It seems that angle of light is the biggest problem. Is there some another way how to change it?

Thanks