🚀 go-pugleaf

On Sat, 06 Apr 2002 18:39:00 +0100, mike-barred@philomel.demon.co.uk
(Mike) wrote:

>marula31@hootmail.com (---) wrote:
>
>>On Wed, 3 Apr 2002 08:14:31 +0100, John Chapple <jc@ch-w.demon.co.uk>
>>wrote:
>>
>>>How can an Liquid Crystal Display type be low radation, or even high
>>>radiation? Radiation applies only to Cathode Ray Tube types
>>
>>They can still radiate nasties. If not electromagnetic radiation,
>>then some sort of ionisation.
>>
>>Apple is having problems in this respect, or so I'm told.
>>
>>The last one I bought has a 'TCO 99' sticker, which is
>>supposed to guarantee the thing against throwing out nasties.
>
>Firstly, it's worth pointing out that visible light *IS*
>electromagnetic radiation.
>
>Secondly, LCD displays get their brightness by means of illumination
>with miniature cold cathode fluorescent light tubes placed at the
>sides of the LCD panel.  The fluorescent light is diffused across the
>screen by inclusion of a diffusion screen behind the LCD panel.  The
>LCD panel itself emits nothing, although some LCD technologies use a
>very small magnetic field within the panel.  It's just a mechanism for
>filtering the transmission of light.
>
>The stories about "nasties" with LCD's seems to relate to the fact
>that some people don't seem to get on too well with fluorescent light.
>This problem isn't specific to LCD displays; some people claim to get
>headaches when working under fluorescent lights.  The reason why isn't
>clear although there has been some surmise that it might be due to the
>fact that fluorescent lights flicker at a rate of 100 hertz.  However,
>the problem may be more to do with bad workplace design rather than
>with the type of lighting.
>
>I wouldn't mind betting that the story about Apple displays is just
>marketing FUD created by one of Apple's competitors.  It's also very
>easy to get TCO 99 certification for a device which doesn't emit any
>radiation at wavelengths that are usually considered harmful (eg
>X-rays, UVC and microwaves).  I rather suspect that you would be very
>hard pressed to find an LCD PC display which hasn't been certified to
>TCO 99.

I hear what you say, and the 'radiation' doesn't worry me.

My other LCD monitor, by AOC, much better than the PC-World one,
doesn't have TCO99 certification.

-- 
J+