M4400 RGB-LED Backlight Comparison

RGB LED is actually the most power hungry of all the screens, 2CCFl is second and WLED is 3rd. Not sure if LED backlights are lighter than CCFL tubes but it does allow a thinner screen. If this is actuall the case i'm still not sure of. The RGB LED does need a different back cover than the 2CCFL but this is also because of the connector being placed on the other side of the panel and cover.

 

the 2ccfl and rgbled have same back cover ,JAL22,WLED is JAL20

 

Well, a user that upgraded his to the RGB LED needed a different cover actually because he couldn't connect it. If you have a look at the service manual you'll see that the 2 covers are different.

 

Very interesting post.

Could anyone upload any pics comparing RGBLED vs 2CCFL screens?

 

Sorry, but I don't understand... Which is more thinner, 2CCFL or RGBLED?

 

Since last posting I exchanged one of my M4400s (the one shipped two months ago); it had stability issues and the backlight bleed was distracting.

The replacement (the unit on the left in all the photos below) has been with me for a few days and, at first, seemed to be OK. For one, the backlight is much more even.



But after using it these few days, I began to experience vision fatigue, a sensation I don't experience with my other M4400 nor the one I exchanged. I decided to put my M4400s side-by-side to see what it is about the display on the replacement that causes my vision fatigue. Both M4400s are equipped with the SEC5443 panel, both are set at 100% brightness, both were shipped in June, both are on the same OS, and display driver. Again, the replacement is on the left in all photos.

After looking at it for some time, it seems the replacement is even more saturated than my other M4400. Red especially is amplified; light backgrounds have a "dirty" pinkish/reddish hue to them. It looks very warm and very saturated whereas the other M4400 tends to look cooler and less saturated.



Take note of the sun and the reflection it casts in the water, the replacement seems overexposed.



These show the warmer and pinkish/reddish nature of the replacement.



Colors with RGB-LED are nice but saturated, the replacement seems to up the saturation a few notches however.



And lastly, a few shots of my M4400s next to my XPS M1530 with a LED display. Center M4400 is the replacement.



I don't have a calibrator to take this experiment any further and from what I understand, calibrators that work effectively with RGB-LED displays, such as the Spyder3, are on the pricey side. But without any calibration, my out-of-box preference is definitely the M4400 with cooler color temperatures. I can use it for extended periods without experiencing vision fatigue.

Interested to get some thoughts from other members around here.

 

Thanks for the post Hardway,

Could you please post some comparisons of the RGB LED and the XPS LED screen?

 

Interesting post Hardway. Your new screen seems to be much better than the previous one.

Calibrating high gamut displays has proven to be tricky, especially since there is no unified way different color profiles are handled in Windows. In my opinion, a high gamut display is perfect for specific tasks but it cannot comfortably be used as an all-purpose screen.

 

I'd have to agree. The RGBLED display, while beautiful, has proven to be uncomfortable to my eyes after prolonged use. It's a combination of the higher resolution (even after adjusting the font DPI) and the extremely vivid colors. I'm considering swapping it out for the CCFL or LED display.

Also, there's a noticeable amount of banding in gradients on my RGBLED - at first I thought it was an isolated incident but in viewing a half-dozen M4400's, all with RGBLED's, I believe it's definitely the display that's causing it. My XPS M1530 with its LED display doesn't exhibit the banding.

 

Hello Hardway,

HP offers an RGB-LED color profile that is pretty well suited for being used with RGB-LED screens in general. It should lessen your oversaturation of reds (and greens).

Getting the HP RGB-LED color profile:

1. Go to http://h20000.www2.hp.com/bizsuppor...swLang=18&mode=2&taskId=135&swItem=vc-61798-1 and download the executable file.
2. Execute the file, make sure the UAC dialog says "Hewlett Packard":
   
3. Read the license agreement.
4. When being prompted for a location to install to, enter the name of a folder (doesn't have to exist yet, will be created automatically) that will be temporarily used to store the installation files (and the color profile):
   
5. As soon as the extraction routine finished the process of extracting and presents the following screen, click "Cancel":
   

​

Setting up the screen to use the HP RGB-LED color profile:

1. Open the folder you specified during the extraction process of the color profile.
2. Within that folder, navigate into the "32bit" subfolder and double-click "HP_LP2480zx Full Color Preset.icm". This will install the color profile, no confirmation will appear.
3. In Control Panel, double-click the "Color Management" icon:
   
4. Select the screen of your M4400 from the drop-down menu and check the box below the drop-down menu. After that, click the "Add" button at the bottom of the window. A new window with a list will appear, select "Full Color Preset" from it and click "OK".
   
5. Click "Close" in the Color Management window.
6. Restart your machine.

​

For more information about this, visit:http://de.babelfish.yahoo.com/trans...-/artikel/135881&lp=de_en&btnTrUrl=Übersetzen (automatically translated).



Please tell me if this helped.

Christoph