T42 SXGA+ display material optical transmittance

[irus]

this question is useful for those who value the health of their eyes as UVA/UVB can cause photokeratitis i.e. corneal damage and inflammationhttp://www.jkllamps.com/apnotes/TB-1005C.pdf. Good news is it can be easily cured by avoiding the source of injury but for that we need to know the wavelength and magnitude of UV rays reaching the eyes.

So i'm curious if someone knows or has performed some optical transmittance tests to see how much UV the panel is emitting. From what i've researched CCFL starts emitting at 253 nm which is uvb range which is then filtered by acryclic pipes (or such) to about 320 nm and beyond that some say upto 380 nm is blocked, i'm not sure.. http://www.sciencedirect.com/science?_o ... archtype=a

can we get a definite answer what the exposure is from the panel. Is all UVA being blocked upto 400nm or do we need viewguard http://www.viewguard.com/en-us/? I would hope my beloved t42 blocks it all upto 400nm.

Second what is the display material which has the matte surface? is it PMMA or polycarbonate or something else? Is there a spec sheet of the display panel and its components somewhere?


Thanks.

[irus]

update: TCO standards don't talk about UVR either. So is the UVR non existent or has no standards governing it because the amount of uvr is negligible whatever be the backlight? can't be either.

ANSI z.87+ defines uv-a as 315-400 nm while screen protection manufacturers define uva as 315-380 nm, so they claim 99.9% uv protection leaving out 380-400 nm playing on the definition. 3M comes out clean and claims 96% uv block, i'm guessing that is blocking 380 nm out of 400 nm.

I guess even a regular clear polycarbonate sheet would meet 3M standards.

Any inputs welcome.

[T400plus]

have you tried pasting a screen filter on top of the LCD screen supplied by the vendor.
I had a bad T41 LCD which used to burn my eyes till i pasted that plastic(?) sheet on the lcd.
That sheet was purchased from a store (way back in 2005) for something like Indian Rs.800/-
and I was very obliged to the seller.
PS: I should mention that I am sometimes unexplainably photo sensitive to the light from large tubelights.The problem disappears after some weeks of avoiding the light from the tubes.

[irus]

have you tried pasting a screen filter on top of the LCD screen supplied by the vendor.
I had a bad T41 LCD which used to burn my eyes till i pasted that plastic(?) sheet on the lcd.
That sheet was purchased from a store (way back in 2005) for something like Indian Rs.800/-
and I was very obliged to the seller.
PS: I should mention that I am sometimes unexplainably photo sensitive to the light from large tubelights.The problem disappears after some weeks of avoiding the light from the tubes.

i know what you mean.. i'm surprised this problem is not more common.. i guess people are happier to wear specs

yes i saw that PET material plastic sheet, i got it for INR 50 (usd 1) last week. Viewguards sells it for $16+ shipping. I found this tech pretty cool http://www.pixelqi.com/blog1/ the reflective mode is exactly what i want.

otherwise i saw some projects online where fluoroscent light is replaced with sunlight/incadescent.. that is a worthy project

[lead_org]

use HWinfo32 find out the panel manufacturer, then search for the panel spec or email the manufacturer for more information, Lenovo don't disclose such information, and most people wouldn't bother or have the necessary tool to do the experiment.

If you are worried get a pair of glasses with UV filter on it, which is what i currently do. Alternatively get a new laptop with LED panel.

[T400plus]

LED backlit displays emit rays in what range?
They are definately brighter but I was wondering if they are any better other than that.

[irus]

use HWinfo32 find out the panel manufacturer, then search for the panel spec or email the manufacturer for more information, Lenovo don't disclose such information, and most people wouldn't bother or have the necessary tool to do the experiment.

If you are worried get a pair of glasses with UV filter on it, which is what i currently do. Alternatively get a new laptop with LED panel.

i have got the pair! thanks for the tip on hwinfo32.

[irus]

LED backlit displays emit rays in what range?
They are definately brighter but I was wondering if they are any better other than that.

365 nm you have to run them at the brightest setting otherwise there could be issues with the pulsing by the PWM