Hi. I'm trying to make a DPI display to work with my Raspberry Pi.
First, I searched around and found out that the 555 timer IC is a good way to control the brightness of the display. And since the background LEDs needs around 23V to function, I've included a step up converter.
It's for a LCD like this one: https://www.adafruit.com/product/1680

But then someone recommended me to use a LED controller instead. Is it a better choice? And if so, what IC would fit this project? That has both dimming and boosting function.

I'm a beginner and this is my first schematic design. So I'm open to any kind of feedback you might have.
Thank you.

 

Where is the LED data sheet?

I see a solution to an undefined problem.

 

but the backlight requires a constant-current mode boost converter that can go as high as 24V

I do not have a dats sheet for the display. We need to know how much current!
Replace U1 & Q1 with this. It will hold the LED current constant. You have 5V power on the Pi. The 555 will do the same dim thing it was doing.

 

I do not have a dats sheet for the display. We need to know how much current!
Replace U1 & Q1 with this. It will hold the LED current constant. You have 5V power on the Pi. The 555 will do the same dim thing it was doing.
View attachment 225050

Thank you! I couldn't find the data sheet. But the display draws around 50mA at 23V.