John Bowen Synth Design

Hello,
I am just checking the manual of the Solaris and I have a question related to the control displays.
Is there actually a function in the Solaris to adjust the displays in contrast and brightness ?
thanks in advance

No, the only display that you can adjust contrast would be the central LCD unit, and you have to open up the synth to access it.

For the 2x40 text displays, I recommend the OLED versions, as they are directly replaceable, and give a better contrast. I use the following part from Sunlike Display: AL4002AWWB-UA-WB-U
Their website: http://www.lcd-modules.com.tw/