Looking for ultra bright backlight

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Joined: 10 Apr 2019, 15:35

Looking for ultra bright backlight

Post by GUNNM » 10 Apr 2019, 15:43

First of all, thanks to blurbusters for its quality articles.
In a holographic display project, when I render 9 differents views, the brightness of the screen is divided by 9.
So I have to change the backlight of my screen by a much more powerful one.
I thought I'd ask for advices here before I start.

The monitor used is an Asus ROG Strix XG258Q @ 240 hz.

I saw on blurbusters.com that Chief Blur Buster realized a backlight with strobbing. Was there an Arduino code released?
Or is there on the net some codes to drive a LED backlight?
I have never used Arduino, that's why I'm looking for some existing code, it will prevent me from having to learn with tests/errors.

How to manage the light boost electronically: is a mosfet/resistance couple enough?

As seen on the page/arduino-scanning-backlight/, I think I will use LED ribbons driven by one or more Arduino compatible MOSFET high power switch, if there is one going up to 240hz.
To get 10 times more light, I guess I'll have to fill the back of the LCD with white LEDs, tightening them to the maximum.
So I need a ribbon LED tight and powerful.
Can you advise me on LED ribbon to choose? and on an adequate driver card?

Thank you in advance for your advice.

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Re: Looking for ultra bright backlight

Post by Chief Blur Buster » 15 Apr 2019, 10:44


Firstly, if you do not need motion blur reduction, you do not need microcontroller control such as an Arduino. You have to understand that the Arduino's original purpose was to do motion blur reduction via precise synchronized flashes per refresh cycle.

Next, most edgelights and backlights are steady-state, and thus don't require code. Getting much brighter than factory edgelight may require heatsinking or watercooling, which will be your more complicated consideration.

Also, XG258Q uses an edgelight, not a backlight. Its edgelight is integrated into the inside of the panel's metal casing so you will need to be an expert in disassembly and be very careful about damaging the LVDS cable. It's probably more than 10x more difficult to disassemble than you'd expect if you've never handled electronics. Do you have at least 2 or 3 units (costs $$$) since you will probably break the panel on your first attempt. Alternatively, get a cheaper panel and practice on them first.

The other (much easier) possibility is to overclock/boost the existing edgelight that's built into the LCD metal casing. This raises risk of burning out the edgelight but with a little bit of extra cooling added, you may be able to boost it to approximately 1000 nits (for an effective ~100 nits when divided by 9) with some very careful voltage-boosting adjustments. You may not want to run it at that level for a long time, however.

The fact you asked about an Arduino suggests you are probably not prepared to do this project; have you considered simply using the panel as-is? Do you have any electronics helpers?
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