Diff between 15.6HDF TLF LCD and WLED

Well, you said:

That sounds like you think the B+RGLED panels are RGBLED panels.

Anyway, it doesn't really matter. If I had to guess, I'd guess that the B+RGLED panels use the same principle as "typical WLEDs" in which a short wavelength LED illuminates a phosphor which then downconverts some of the photons to longer wavelengths. AU Optronics (or their LED supplier) has probably come up with a different set of phosphor that allow better wavelength coverage. If this is the case, I don't even mind Dell using a different name. The name is slightly unfortunate in that it might lead one to conclude that there's a blue LED and a red/green LED. While multiwavelength LEDs are theoretically possible, red & green are pretty far apart and the material systems are typically different as well, with InGaN/GaN for green and AlGaAs/GaAs for red.

If it turns out the difference is in the LCD portion of the panel, then the name choice is a bit more disingenuous.

 

There was a thread somewhere in this xps forum called something like "diff between B+RGLED and WLED(or RGBLED)" (or something) that had alot of good info in it, but can't seem to be able to find it

 

This one, maybe? If you know of a different/better one, let me know, and I'll dig around to see if I can find it.

 

Haha, yea that one, I just came to post it but you beat me to it, grrr

check posts #54 and #55

Quote from AUO

"If the red, green, and blue LEDs are mixed appropriately or the monochromatic LED is put together with phosphor such as blue LED with red and green phosphor or blue LED with yellow phosphor, one can obtain uniform white light which can be used as the backlight source of LCD TV."

red, green, and blue LEDs = RGBLED
blue LED with red and green phosphor = B+RGLED
blue LED with yellow phosphor = WLED


This is the B+RGLED tech

 

Good find! I actually thought I read the other thread pretty carefully, but somehow I totally missed the article!

 

Quickly made a diagram:



How's that?

At lest the "B+RG" part makes sense this way.

 

If your diagram is correct, then it makes understanding this technology much easier for any layman. Thanks.

 

Makes sense. I had thought that yellow phosphor was already a mix of red and green phosphors, but I guess there could be a single yellow phosphor, and the B+RG uses two different phosphors mixed together to make a more accurate 'yellow', resulting in a more complete color gamut.

 

I think you guys are right, but I am still chasing down an engineer who can confirm.

 

I digged this off wikipedia:
Phosphor - Wikipedia, the free encyclopedia

and....

Sharp to Employ White LED Using Sialon -- Tech-On!



Makes alot of sense right now.

 

You think it wouldn't be so bloody hard to get a straight answer, eh?? I had my 1080 screen installed last week to replace the 720 screen that the machine came with - and for some reason, the color was WAY off. I spent a couple of hours with my color calibrator trying to fix the colors, but my reds are still out of control a bit. I think I got a bum panel... but not sure if it's possibly a software problem instead. The colors on the 720 panel were ok. Just for an example, in the intel graphics CP (every system will be different), I had to change:

all colors blue red green
Brightness -2 -2 5 3
Contrast 41 41 47 49
Gamma 1 1 1 1
Hue 0
Saturation 0 0 0 0

It's still off a bit on the reds, but I only know how to calibrate my plasma tv and the controls are not the same on the cp!

 

FYI, (what appears to be) the matte version of the Dell XPS15 screen is now available from Mythlogic as a custom upgrade on the new Clevo/Sager laptops.

 

Ok guys, I actually registered to answer this question I'm involved in LED R&D so I can probably answer this. Here we go:

As pointed out before, LEDs can create white light in 2 different ways: combining multiple monochromatic (single colour) LEDs or a combination of a short wavelength pump and phosphor(s). To create white light we need at least 2 monochromatic an complementary light sources light sources. A good example would be blue + yellow LEDs. Looking at the CIE x, y chromaticity diagram File:Chromaticity diagram full.pdf - Wikimedia Commons you can see that white light is right at the intersection between yellow and blue. What if we want to make more colours than just gradations between yellow and blue? The RGB systems comes to the rescue: by combining a red, green and blue light source we can create every possible colour withing that triangle. So where does the gamut comes from? The place of our light source in the x,y diagram depends on it's spectral purity. The narrower the spectrum, the more saturated the colour appears and the more towards the edge of the diagram its place will be. In other words: spectrally pure light sources create a large colour gamut. The combination of red, green and blue LEDs as backlight source is a good example of this. Problem: its difficult to keep the white balance correct with all these separate coloured LED emitters.

I'm sure you've all seen single white LEDs. These are made by combining a blue LED and broadband phosphor which emits all the way from green to orange-red. When used as backlight, so called WLED backlights, the primary colours are obtained by filtering portions of the light through the regular LCD colour filters. These filters are relatively broadbanded which results in unsaturated colours and a small gamut. However, you can combine a blue LED with green and red emitting phosphors. This is exactly whats done in the B+RG screens. It´s quite cheap and gives very good gamut properties. The gamut is still smaller than the gamut of a dedicated RGB backlit screen though as the phosphor have a broader spectrum which results in less saturated colours. My humble opinion: this is a very good solution.

So, hopefully this solves the mystery

 

Sounds like the best explanation I've heard so far. Much appreciated!

 

I ordered a Vostro 3500 from dell's outlet with this screen:

15.6 inch FHD Wide View Anti-Glare LED Display

less than $500 total for what appears to be a full high def screen, awesome

but I got this:

Module,Liquid Crystal Display,15.6HDF,White Light Emitted Diode,AG,Lg Display

The usual 1366 x 768 screen, damn, probably gonna have to get an XPS to get FHD screen

 

If you have documented proof that you ordered/paid for the "FHD" (1080p) screen, and not the "HD" (anything 720p and higher) one, then you should call Dell and have them send a tech out there to replace the screen. They have to give you what you paid for.