Low emission high definition tv?

[[email protected]]

Dear folks:

My sister is very sensitive to electrical imput...loud noises, auditory
buzzes (like in some department stores, etc.), high voltage wires,
etc.. I would like
to help get her a high-definition tv but I don't know if they make any
with relatively low emissions. I am trying to do some research on this,
thus my question to you.

Do you know of any tv manufacturers who might make low-emission,
high-definition tvs? She has an old 19" analog tv set now (about 20
years old). I don't even know how standard high-def tv's compare with
these older analog tv sets regarding emissions. Do you know anywhere I
might do some searches on the internet for my research on this? Also, I
am not versed in electronics or electronic lingo, so the simpler the
explanations, the better for me!

thanks--!
Craig

 

[Dwayne]

Dear folks:

My sister is very sensitive to electrical imput...loud noises, auditory
buzzes (like in some department stores, etc.), high voltage wires,
etc.. I would like
to help get her a high-definition tv but I don't know if they make any
with relatively low emissions. I am trying to do some research on this,
thus my question to you.

Do you know of any tv manufacturers who might make low-emission,
high-definition tvs? She has an old 19" analog tv set now (about 20
years old). I don't even know how standard high-def tv's compare with
these older analog tv sets regarding emissions. Do you know anywhere I
might do some searches on the internet for my research on this? Also, I
am not versed in electronics or electronic lingo, so the simpler the
explanations, the better for me!

thanks--!
Craig

For this case stay away from Plasma TVs, they are basically as powerful as a
microwave oven. A high def that uses LCD or DLP (Digital Light Projection)
would be better. The DLP TVs use microelectromechanical (MEMS) mirrors to
switch light to the display (illuminated pixel) or away from the display
(dark pixel). LCD (Liquid Crystal Display) use liquid crystals to either
block light (off mode) or pass light (on mode). In the off mode the crystals
are disorganised and opaque (dark). When a bias (voltage) is applied the
crystals line up and the display in front of the pixel become transparent
(bright). Also since light is an electromagnetic wave, the size of the tv
should probably be kept small.

Dwayne

 

[SioL]

Also since light is an electromagnetic wave, the size of the tv should probably be kept small.

Dwayne

Huh? Than she needs to avoid the sun and light in general.

One warning regarding cheap LCD tv sets, look at the colour
transitions. The cheap ones have smaller number of colours
which can look really bad in certain scenes where large areas
of the display are of very similar colour (the sky, sea etc).
Have a good long look at the picture before you buy it.

 

[Dwayne]

Huh? Then she needs to avoid the sun and light in general.

I'm not a doctor and I don't pretend to understand the condition. I mearly
stated a fact.

Dwayne

[snip]

 

[Paul Hovnanian P.E.]

Most of the HD sets I've seen emit the same crappy programming that the
standard definition TVs do.

 

[Pooh Bear]

I'm not a doctor and I don't pretend to understand the condition. I mearly
stated a fact.

Dwayne

It sounds like your sister is reacting to the *sound* associated with certain
electrical circuits.

/quote

My sister is very sensitive to electrical imput

( your speculation )

....loud noises, auditory
buzzes (like in some department stores, etc.), high voltage wires,

( high voltage wires are often buzzy )

etc..

/endquote

In short there's nothing you need to worry about with modern TVs.

Old models often had line output transformers that 'whined' and was annoying -
but flat screen displays don't need them. Modern HDTVs work at frequencies
that are inaudible too ( same problem used to affect older computer displays
too sometimes )

My money is on your sister being sensitive to auditory distractions - not the
supposed electrical phenomena promoted by the 'tin foil hat' brigade. ;-)

Graham

 

[[email protected]]

Dear folks:

Thanks for your responses. Do any of you have any recommendations on
electronic companies-- online or brick and mortar-- which might be more
informed about lower emissions? Or any place on the web I might get
more info on this?
thanks again,
Craig

 

[Frithiof Andreas Jensen]

Do you know of any tv manufacturers who might make low-emission,
high-definition tvs?

No -

But, thinking rationally, I would go for an LCD-type screen because they use
low voltages and low currents, thus have less energy available to radiate
(Depending on construction there might be some electromagnetic output from
the internals, it should be very low, assuming the set meets EMI
requirements).

She has an old 19" analog tv set now (about 20
years old). I don't even know how standard high-def tv's compare with
these older analog tv sets regarding emissions.

I would *assume* the old 19" to be spewing EMI in abundance in all
directions, being built in a time where EMI regulation was to keep the noise
below the level where one disturbed the neighbours radio/tv set!

So, In Reality, it is hard to tell what will work for you - because it it
probably your sisters *perception* of EMI levels that matter to her and not
what is actually there/measureable!

Maybe a more practical approach is to rent/try a few different sets?

Repeat until you arrive at one she is comfortable with?

....Which may well be the old, noisy, 19". (or the obscenely expen$$ive set
;-)

I.M.O.:

It's a "Golden Ear" situation - just go with whatever *she* and not the
datasheet says!

 

[Pooh Bear]

Dear folks:

Thanks for your responses. Do any of you have any recommendations on
electronic companies-- online or brick and mortar-- which might be more
informed about lower emissions? Or any place on the web I might get
more info on this?

Well.... depends on what kind of lower emissions you're looking for.

In the UK - there are currently 2 specific types of electromagnetic
radiation that are considered by some to be troublesome. The evidence is
sketchy. Frankly no-one knows for sure.

#1 High voltage power distribution lines. ( if you live near /
underneath them )

#2 Cellphone base stations. ( if you live near them - esp if it's a
kid's school )

Note that *no-one* thinks TV sets are a problem.


Graham

 

[Michael Redmann]

Note that *no-one* thinks TV sets are a problem.

Neither are TV or radio broadcasting stations transmitting 100,000 Watts
;-)

Regards

 

[Frithiof Andreas Jensen]

[email protected] wrote:

#2 Cellphone base stations. ( if you live near them - esp if it's a
kid's school )

.... Ignoring Of Course the radiation level from the 2W transmitter in the
Handset while it is glued to the childrens head ... the basestation that
everyone moans about is typically 12 W at 100 meter distance (and "lobed" so
the power radiates outward, hitting the neighbours at around 400 meter with
a few uw/m2).

"Radiation" is a religious issue.

 

[Rich Grise]

Neither are TV or radio broadcasting stations transmitting 100,000 Watts
;-)

I've heard that guys who work on big radar antennas carry along a wad of
steel wool. Before they climb up on the structure, they toss the steel
wool up in front of the antenna. If it hits the ground, the antenna is
safe. ;-)

Cheers!
Rich