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What exactly is an LED TV set in the UK?

Following up our previous discussion, in light of the recent (yesterday?) Pringles decision, what exactly can and can not be sold as an LED TV in the UK?

For those not following the case, Pringles were excempted from VAT (sales tax is the closest thing in the US) because while snacks such as potato crisps (potato chips in the US) are taxed, Pringles are less than 50% potato and therefore for tax purposes are cakes, which were not taxable.

The judge decided that if it looked like a potato chip and was sold as a potato chip, it was for tax purposes a potato chip, no matter what it contanined.

So based on that decsision, which now establishes a legal precedent, what role does an LED have to play in the operation and display of a television set in order for it to be an "LED Television"?

Geoff.

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Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com  N3OWJ/4X1GM
Reply to
Geoffrey S. Mendelson
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tax

It will be easier when OLED comes in proper. Then like traditional CRT displays, light source and info source are intimately combined together.

Anyone happen to know, diagonal for diagonal, how much better, if any, OLED set total unit power consumption will be over CRT set ?

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

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Reply to
N_Cook

The OLEDs will have much lower power consumption as they function without a backlight of any type. I don't know if there's been any progress in the lifetime issue, the blue LEDs have a very short lifetime compared to the red & green LEDs. You can get some SMALL OLEDs to mess with from 4D systems or sparkfun, depending on where you live.

Reply to
att2

When I was first specing out OLED displays for a handheld device, they were rated at about 10k hours before loosing half their brightness for red and green, and 2k for blue. Last I checked, they were up to about 20k for red and green and 10k for blue.

The lifetime issue depends upon the level you drive them at. If you run them at full brightness, you will begin to notice a shift away from blue (to yellow) quickly. If you run them at half brightness and slowly crank up the blue to balance, they will last a lot longer.

I guess one of the ways to make them last longer would be to use a pattern that has more blue, such as red-green-blue-blue, or red-blue-green-blue, or something similar. Then you could run the blue at half level and still have it white and a resonable combined life time.

In the end, I'm not sure it matters. Once the newness fades and development costs are paid off the cost will be so low that you will be able to buy a "raw" screen in a roll, unroll it and slide it into your TV set or computer monitor frame.

Geoff.

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Geoffrey S. Mendelson, Jerusalem, Israel gsm@mendelson.com  N3OWJ/4X1GM
Reply to
Geoffrey S. Mendelson

Just out of curiosity, what causes LEDs to reduce in brightness over time? I can understand why florescent lamps and white LEDs fade, but not pure color LEDs. Anyone know?

Reply to
greenpjs

Heat causes impurity's to diffuse in semiconductors. More heat:more diffusion. To much diffusion: A broken semicunductor.

Reply to
Sjouke Burry

;-) In the same way as it's so easy to buy cheap replacement parts for modern TVs?

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*How come you never hear about gruntled employees? *

    Dave Plowman        dave@davenoise.co.uk           London SW
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Reply to
Dave Plowman (News)

Which was exactly the point I was making when I started that original thread. It's an interesting one. Personally, I don't think that Pringles are in any way similar to a potato crisp (U.S. chip). They have neither the texture nor taste, but clearly, when P&G invented them, that was what they were aiming at when they decided on the shape. They are actually 45% 'potato', I believe, which the judge decided was enough to make it classifiable as a 'potato snack'. In my view, whilst what it is made from might come from a potato, it is a stretch of the imagination to call something that has been formed from potato starch or whatever it is that they extract, a potato snack in the same way that a potato crisp, which is made from deep fried unprocessed raw potato slices, is. For this reason, I believe that the judicial decision was wrong. Similarly, just because one of these 'LED' TV sets contains a large number of LEDs in a matrix behind the screen, I believe it is wrong to classify it as a "LED TV" because the primary display medium, is an LCD matrix, not the LED matrix behind it, whose only purpose is to provide the light source for the LCD panel.

Arfa

Reply to
Arfa Daily

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