The Technology Vent and Rant Thread

[JSWolf]

Originally Posted by Quoth

Sony had a small $10,000 real LED TV / Video monitor for broadcasters some years ago. They called it Crystal LED because TV makers had already called LED backlit LCD TV, "LED TVs". But crystal might mean something different now. QLED is misleading.

It's HATEFUL the misleading adverts.

I wanted a BT mouse to save a USB port and visited town today. Loads of wireless mouse brands. However EVERY SINGLE ONE used a USB "dongle" and none used BT. So pointless.

Maybe I'll get a real BT mouse online.

The Logitech M240 is a really nice BT mouse. I have two of them.

https://www.amazon.co.uk/Logitech-Bl.../dp/B07W6HCFYX

[JSWolf]

Originally Posted by Quoth

That's interesting, but given the average "lounge" size and income here, plus likely €37K (Europe pricing and local VAT) it sounds more Corporate than domestic.

I suppose there is a USA domestic market for it if it's 4K. Dynamic range & response time should be good.

It's said by one of the top TV reviewers to possibly be one of the best TVs. We'll know more when it can get an even better review.

[jbjb]

Originally Posted by Quoth

You can't buy them, and they can't be decent colour rendition without a layer on top of the LED.

So, no there are currently no actual LEDs that are natively white, and if what ever that is ever leaves the lab to production it will turn out to be not actually an LED.

I'm afraid that's simply not the case. Monolithic LEDs with multiple quantum wells can produce polychromatic light, including white, to perfectly acceptable CRIs.

Here are some papers and articles on the subject - interesting reading.

Polarized monolithic white semipolar (20–21) InGaN light-emitting diodes grown on high quality (20–21) GaN/sapphire templates and its application to visible light communication

Design, growth, fabrication and characterization of white LEDs by monolithic on-chip epitaxial integration on (11-22) semi-polar GaN

Optics and Photonics News: A Phosphor-Free White LED

Design analysis of phosphor-free monolithic white light-emitting-diodes with InGaN/ InGaN multiple quantum wells on ternary InGaN substrates

[Quoth]

They are only lab research.
They are also not conventional LEDs.

Also I don't see a claim of good CIR, in fact the spectrum looks terrible. They are not true white but multiple colours on one chip. It's experimental.

Maybe one day they may or may not be commercial. Plenty of hyped tech failures.

Right now the so-called White LEDs for illumination that you can buy are using phosphors. The R G B LED are not for illumination as they have 3 narrow spectral peaks, they are for indicators and backlights. These lab specimens don't look promising for general illumination and have no commercial timeline. See Optane memory, holographic disks and fusion power.

[Quoth]

Originally Posted by JSWolf

It's said by one of the top TV reviewers to possibly be one of the best TVs. We'll know more when it can get an even better review.

Actual LEDs do make LCD, OLED and DLP look poor. It should be fabulous if done properly.

[jbjb]

Originally Posted by Quoth

They are only lab research.

But they do exist.

They are also not conventional LEDs.

No true Scotsman ...

[jbjb]

Originally Posted by Quoth

Also I don't see a claim of good CIR

The Optics and Photonics News article quotes a CRI of 88.

They are not true white but multiple colours on one chip. It's experimental.

Hard to do white light without multiple colours, by definition!

The spectrum of conventional phosphor-coated white LEDs is hardly flat either - typically a sharp blue peak from the LED and a wider yellow peak from the phosphor, though different combinations are available.