CFL vs LED Backlight

Hi guys


How big is the difference between CFL and LED backlight in T400?

and, how easy would it be to upgrade the memory? I bet it is nothing complicated. Just wanna make sure on this.

Thanks alot

 

http://www.youtube.com/watch?v=RVPt6RODSW4

At 3:30 you can see how the memory upgrade works.

As for the display: It's a matter of taste. Try to find a LED display in real life.

 

No, there is no trouble to upgrade memory other than in the picking.
Renee

 

Unfortunately the difference between CCFL and LED is a matter of battery saving and lifetime more than a taste thing.
LED is known to be more power efficient than CCFL, and the lifetime is longer. It is also brighter (higher nit)

 

Thank you guys.

If there is any picture of CCFL and LED side by side, it would be great!


Thanks for the youtube link QualitySeeker
I figure that I will just let them add for me. Since, if I buy it on my own, it will only save a few bucks.

 

Go here and navigate to your particular model for step-by-step instructions on upgrading the memory and pretty much anything else on your ThinkPad...

http://www.lenovoservicetraining.com/ion/

 

So you'd rather use an efficient display than one you like?

I don't think one should choose the most important interface by efficiency.

 

There has been no published article regarding the relation between color reproduction and the type of LCD (CCFL or LED). So for the mean time, the two types of LCD are roughly the same, except extra advantages for the LED screen.
I have an X200, and my relative has an X200s, and there is absolutely no difference in color reproduction that I can detect. The X200s's screen is only brighter and more power efficient.
There are a few people who are allergic to LED screen, but there are also people who are allergic to CCFL screen, so it's a moot point. And by allergic I mean strain eyes and headache.

 

It's not about types of LCD, it's about what's actually used in the notebook in question. Vendor A produces displays different from vendor B, they may or may not mature over time, etc. You can find a lot of comparisons between different LED displays on these forums - they vary a lot.

Best option is to see them in person.

 

Aren't the LED screens wider gamut than the CCFL? That could be a factor for many people as very few apps are properly colour managed (and even then, you need a £100-£300 calibration device).

 

That really depends on the exact model. The T400, x200s, and x200 Tablet are NOT wide gamut LED displays.

Conversely, the w700 (CCFL) is wide gamut. I believe Dell and HP offer an even higher gamut (LED or dual CCFL) display.

The primary difference is brightness and efficiency. LED displays tend to be brighter and use less energy than a comparable CCFL display.

Other benefits. LED displays can be thinner than CCFL options (this really depends on the manufacturer's choice [e.g. the T400 is the same size whether CCFL or LED]. LED screens tend to have a more uniform backlight. LED screens tend to have a superior contrast ratio because LED supports turning off pixels and producing true blacks; all CCFL can ever create is a really dark gray.

Downsides. Some people find LEDs to cause eyestrain (especially related to the way in which they dim). Backlight bleeding (especially in the bright green range) is relatively common.

On the whole, I think LED is superior, but the difference is hardly night and day (conversely TN vs. AFFS+ is night and day).

 

Wanted to clarify a couple things. The nice screen option on the W700, for note is not wide gamut in the sense of the way the rest of the industry uses the term. If I remember right, the premium panel in the W700 is somewhere around 72% NTSC gamut which is considered standard gamut and what most good desktop LCD's always used to be. The wide gamut ones out today are usually at least 90% of NTSC or sometimes higher (eg, some are 102% or a bit higher). A typical standard notebook LCD is somewhere in the range of 43% NTSC give or take a little.

Also, about the backlight. LED isn't inherently any more even than CCFL because the simple reason of why one LCD has no bleed and another has a ton has very little to do with the backlight itself. How much bleed you do or don't see is mainly due to the quality of the backlight polarizer/filter that the manufacture choose to use. There's also a little bit of variance among panels of the same model due to some filters being installed properly and some being installed a little "off".

LED also doesn't inherently have better contrast, that's basically up to how the panel was designed, as all LCD's do to show black or dark colors is shift pixels in that particular area to block a constant light coming from the backlight, thus creating a "black" pixel. How well this is accomplished depends on the ability of the pixel to block light. An LED backlight *can* however turn individual LED's in a given section of the backlight off to lets say, make one section of the panel look darker if that's according to what's being displayed(eg, a scene where the the right side of the frame is outside at night while the left is in inside a well-lit house.

Plasma panels can do exactly what you described though, they can effectively "turn off" individual pixels and makes it so there's more or less no light coming from that pixel. LCD's however can not due to the way the technology works; it's basically up to how well the pixel can block the light emitted from the backlight.

 

Thank you for the replies guy.

I still cant decide which on to get yet.

So, LED is only more bright and long lasting right?

Can you tell much of the difference if you are in a room?

Most of the time, I am in front of it would be in a room with very little lighting /or none. Would it be too bright then?

 

You can always reduce the brightness level on the display.

 

Thats true. haha.

Well, I will update the thread once I have decided.
Still making up my mind.

 

at this point i get the LED screen whenever convinient and possible.

LED consumes less power.
brighter.
instant brightness (CCFL needs 'warm up' time before it reach full brightness)
last longer.

the benefits are clear.