Wide-Gamut monitor with 5050 RGB LED mod.

It keep failed at chip so another one in chain get ruined until you change out LED to fix it.

Maybe cause from thermal different when it's in operation and when completely off.

I don't have any solution right now to solve it. So I kept it lower brightness but always on to not make it fail.

At Last log I made was the 5050RGB LED which post serious problems on Temperature from reduction of voltage by using passive circuit in means of used of resistors.

I have made new one accommodate with HP LP2475W which is Backlit CCFL IPS Display.

BTW, Bulb life go as long as 7700hrs which tend to give yellowish white and less color purity.

RGB LED known to be the best of color display known to me. So I bought WS2812b RGB LED Strip for 20M.

This is how it get working perfectly, Color different was gone!!!!

BUT Heat issue still remain. 5V need very very huge current to drive. nearly ~1000 LEDs lit all RGB at portion. Controlled with Arduino Micro.

I cooled it with some Notebook CPU Fan. Fits in display's enclosure snuggled.

Sometime huge array of LED that has been assembled by hand, sure that it will have fault by heat or loose connections sometime. So I maintaining it after being use as Mastering monitor for 5 months.

Left : Dell Ultrasharp 2408WFP with WCG-CCFL Backlight

Right : Dell Ultrasharp 2408WFP with RGB-LED Backlight

I purchased 7 rolls of RGB 5050 24v 5m per roll.

Seller managed to send me same batch but the problem remained. It's mixed new and old LED chip in line of ribbon. So I have to cut and connect with same batch. About 10% of all 4 rolls that I used have different colour.

After manage it to almost same batch. The colour uniformity is absolutely amazing as in the picture.

Last time I got badly differrent batch of LEDs. And so I alternated between 4 rolls of them.

After assembled the backlight unit. I stuck with the color problems. Because this monitor used so much of 5050 strip. I used all 4 rolls of 5m RGB LEDs 5050 and found that last roll has differ color compare to Roll 1-3 which led me to do some passive corrections.

I found that problematic roll have sightly lower in blue output so I bypass the resistor of blue channel in every strip on 4th roll and bypass green and blue channel on Roll 1-3. So the color will be nearly match. This is not perfect solution but it help me do better than nothing. Absolutely time consuming and frustration.

In the photo you may see some banding because I just test drive it with cheap RGB IR remote. PWM driven.

Real assembly will be use with Arduino drive at 5000Hz+ to produce Flicker-Free BLU.

It may seem to have no problem at all with color after corrections, If I bring down exposure it should be easier for you to spot. But I just shot this exposure right away to get rid of PWM banding. Easy for your eyes folk!

I suggest to double check the batch of these kind of LED before begin to assemble the strip on BLU panel.

For who don't to be hassle with this kind of problem. I think WS2812b Digital LED which drive at pixel level of each LED will do much better job but with more budget to spend on strip. 5050 WS2812b RGB with 144LEDs per meter will do great job on brightness level and uniformity, But It's to much to be something to dream of, that cost much as buying a good sRGB monitor. Nevertheless, in the future I may doing it. It will be fantastic to imagine with each pixel being control individually. Yes, Local dimming RGB backlit display. That's my wish for next project.

Absolutely hard to QC this backlight. This shows me completely of why the RGB-LED backlit monitor is so expensive.

I have assembled another 2408WFP backlight unit with 10m+ of 5050 RGB LEDs. Very dense array.

Total LEDs : 1026 LED

Used checkerboard pattern and vertical layout to spread the light from LED chip even more to improve Uniformity.

24v will use less current than 12v. So, less energy wasted in copper conductor underneath pcb.

Stay tunes.

Try to make denser array to fix uniformity problem.