Let's Talk About Televisions

Miracle wrote:
> So here I am, feeling up my laptop monitor
> and asking for opinions on why LCD and plasma screens are warm
> to the touch. At least those hugemungous TV screens, because my
> laptop screen is cool to the touch.

I just felt my 22" wide lcd that's been on for over an hour. Warm, but
definitely not hot.

What you are noticing is the heat mostly given off from the backlight.
TV screens only have the beam hitting the phosphor. Now you could
compare the backs and tops of the two and you should see another
difference there.

BZB

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Posted via a free Usenet account from http://www.teranews.com
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Bill <billzbubb RemoveThis @netscape.fishing.net> wrote in news:462388d1$0$12034
$88260bb3@free.teranews.com:

> What you are noticing is the heat mostly given off from the backlight.
> TV screens only have the beam hitting the phosphor. Now you could
> compare the backs and tops of the two and you should see another
> difference there.

Interesting point. But do plasma systems use a backlight? I thought they
provided their own light. LCD's are more like color filter wheels,
filtering light from some other source to appropriate shades and colors, so
have no light of their own, and hence they need a backlight.

The heat from a tube should be mostly from the power supplies, which crank
the voltage up from a measly 110 to a few thousand volts, enough to drive
an electron a foot across vacuum to impact the phosphors on the front face.
Plus the "steering" supplies which power the magnetic coils to steer the
electron to the right place on the face.

In my youth I helped design some monitors that never made it to market, and
got to swap a lot of big tubes between the test rigs. If you find yourself
needing to move a naked tube, be sure to take a ground strap and touch it
all over the tube, especially that hole in the side where the high voltage
connects. You want to drain any residual static. I've done that to a tube
and then come back 10 minutes later and still got zapped, so do it just
before you move the tube. (And dropping a tube can kill you if it implodes,
so I got good at taking a zap without flinching. )
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Check the specifications of TVs. You'll almost end up with this rule:
- LCD eat twice the power of a CRT.
- Plasma eat 3 times the power of a CRT.

The plasma dissipate a lot of heat... a LOT. If you live in an area where
you are on the verge of getting an air conditioning system. You'll have to
invest in some cooling if you wish to watch TV late spring to early autumn.

The thing you want to be sure 100% (read don't rely on the sale person
check the specs) is that there is a HDCP chip inside the TV. With it you'll
be sure to be able to enjoy HD protected content. (HD-DVD or Blue-Ray)

http://en.wikipedia.org/wiki/HDCP

If you don't when the studios will use the protection token you'll end up
with an image quality just a tad better than usual DVD.

As the monkey with crabs stated, most of the heat from the LCD come from
the backlights. While on the plasma it's the technology that basically
throwing energy out of the window.

The LCDs are getting closer to Plasma in color/black quality and response
time. But the main domain where LCD kicks Plasma is the gonads... is
resolution. If you want to go Full HD 1920x1080 you'll end up selling a
kidney to get a 50" Plasma. While LCD reach this resolution with much
smaller screens. I have a PC monitor (Samsung 244T) that is 1920x1200. My
laptop 17" screen also runs in 1920x1200.

This last case is small for not perfect eyes... you'll feel like a
masturbating bat with glaucoma.

http://en.wikipedia.org/wiki/Large-Screen_Television_Technology

To your question... Which one do you own? The answer is none. I still enjoy
my 7 years old 28" Sony CRTs. (one standard and one widescreen) In France
I'm able to get very little HD content. Less than 10 channels on the
satellite DVB-S, a couple of channels on digital antenna DVB-T, some events
in HD on DSL (french tennis open, major soccer games,...) most of the HD
content is fetched thru my DSL set top box with it's on demand services.

So I'll probably switch late this year or in 2008. I'll get a Full HD LCD
screen that suits my highly critical eyes.

--
Fabrice Roux aka [RS]Faramir_agst
PaintShop Pro and Tribes scripts
http://www.fabriceroux.com
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Mr K wrote:
> On Sunday 15 Apr 2007 21:31, Miracle wrote:
>> Eventually he said "Touch the newer screens! The LC-whatevers
>> and those other ones!"
>
> Er... what?

I'm sure you kept reading, Beloved Resident Curmudgeon.

>> Got home, fired up the TV, and waited for a half hour or so
>> before touching it.
>
> I've heard that valve radio sets took ages to warm up as well.

?!?!? Valve?!?!? Is that similar to the old tube sets?

--
>^,,^< Miracle
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*Top* *Posting*

Yup yup- I gotta get some more sleep and come back.
I gotta make sure we don't end up with some huge monster
of a TV that throws off a lot of heat: air conditioning costs
plenty without adding another heat source that might be
unecessary. (<- Spelling?)
Ross wants to get a really large TV this coming winter,
so it's time to start researching options.

[RS]Faramir_agst wrote:
> Check the specifications of TVs. You'll almost end up with this rule:
> - LCD eat twice the power of a CRT.
> - Plasma eat 3 times the power of a CRT.
>
> The plasma dissipate a lot of heat... a LOT. If you live in an area
> where you are on the verge of getting an air conditioning system.
> You'll have to invest in some cooling if you wish to watch TV late
> spring to early autumn.
>
> The thing you want to be sure 100% (read don't rely on the sale person
> check the specs) is that there is a HDCP chip inside the TV. With it
> you'll be sure to be able to enjoy HD protected content. (HD-DVD or
> Blue-Ray)
>
> http://en.wikipedia.org/wiki/HDCP
>
> If you don't when the studios will use the protection token you'll
> end up with an image quality just a tad better than usual DVD.
>
> As the monkey with crabs stated, most of the heat from the LCD come
> from the backlights. While on the plasma it's the technology that
> basically throwing energy out of the window.
>
> The LCDs are getting closer to Plasma in color/black quality and
> response time. But the main domain where LCD kicks Plasma is the
> gonads... is resolution. If you want to go Full HD 1920x1080 you'll
> end up selling a kidney to get a 50" Plasma. While LCD reach this
> resolution with much smaller screens. I have a PC monitor (Samsung
> 244T) that is 1920x1200. My laptop 17" screen also runs in 1920x1200.
>
> This last case is small for not perfect eyes... you'll feel like a
> masturbating bat with glaucoma.
>
> http://en.wikipedia.org/wiki/Large-Screen_Television_Technology
>
> To your question... Which one do you own? The answer is none. I still
> enjoy my 7 years old 28" Sony CRTs. (one standard and one widescreen)
> In France I'm able to get very little HD content. Less than 10
> channels on the satellite DVB-S, a couple of channels on digital
> antenna DVB-T, some events in HD on DSL (french tennis open, major
> soccer games,...) most of the HD content is fetched thru my DSL set
> top box with it's on demand services.
>
> So I'll probably switch late this year or in 2008. I'll get a Full HD
> LCD screen that suits my highly critical eyes.
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[RS]Faramir_agst wrote:
> Check the specifications of TVs. You'll almost end up with this rule:
> - LCD eat twice the power of a CRT.
> - Plasma eat 3 times the power of a CRT.


Sorry, I don't believe you are correct:

My 22" LCD Dell at work is 45 watts when active, 2 watts in standby.
A random Dell 17" CRT is 75 watts active, 7-10 in standby.

Plasma, I don't know a thing about other than they tend to lose their
beauty after a couple of years.

BZB

--
Posted via a free Usenet account from http://www.teranews.com
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"Miracle" <GetLost DeleteThis @yourexpense.com> wrote in
news:1329qlklslu5r9e@news.supernews.com:

>> I've heard that valve radio sets took ages to warm up as well.
>
> ?!?!? Valve?!?!? Is that similar to the old tube sets?

The British called tubes "valves". They've got a queer language over there,
don't they?

(And they pronounce aluminum oddly, too!)
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In article <462508f2$0$16265$88260bb3@free.teranews.com>,
billzbubb.RemoveThis@netscape.fishing.net says...
> My 22" LCD Dell at work is 45 watts when active, 2 watts in standby.
> A random Dell 17" CRT is 75 watts active, 7-10 in standby.

Compare TVs... not computer monitors.

Reading the specs of the 42" Plasma and LCDs:
- LCDs are around 250W.
- Plasmas are around 330W.

While widescreen 100Hz 32" TV range from 120 to 150W. Of course it's not
the same screen size... but it's not the same usage or resolution either.

--
Fabrice Roux aka [RS]Faramir_agst
PaintShop Pro and Tribes scripts
http://www.fabriceroux.com
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