This is the current display on the P3ST QRP SSB Transceiver which shows a lot of info on a 128X160 small sized screen. It is of the ST7735 form of Display.
What is presented are two VFOs (A &B) that have VFO memory, but also a much smaller display of the VFO frequencies with a thought of split operation. The simulated Green LED's signal what is "hot".
The initial theory was that you could receive on the A VFO but actually transmit on the B VFO. While the logic exists in the sketch, it was never actually implemented. Albeit you can switch the VFOs with a panel switch but not split operation.
We also have the Step Tuning rate and the S Meter which by the way is implemented using an audio sample. I included my call sign just in case I forget and the title under the A VFO directs me to the Arduino sketch in the Arduino directory. Lest I forget we show which sideband is selected with a simulated RED LED.
Needless to say, it took many hours of programming to get this display to work and it was more than a One and Done! [Referring to G3RJV (SK) who classed his projects as one evening of work on a project and you are finished.]
So, OK, there is nothing wrong with the display other than there is so much going on in a small screen that you either are squinting to see everything or just ignoring most of it.
Thus, the shift to the ILI9341 is to up the size of the information so it is easier to read and streamline the display so you can have the same information with less clutter.
Here is an example since we have VFO memory. Suppose we only show one frequency with an added small piece of information that states VFO A or VFO B using the A or B as we have now. We would also eliminate the smaller print frequencies since we are not including split operation.
Oh, and double Oh, with the uncluttered space resist -- now what can I add in to the display. There is that Stockton Bridge "thingie" to give you SWR and then there is measuring the battery level since you are doing POTA operation and on and on. That was not the purpose of the change to the ILI9341 -- it was to improve visibility and to do the Marie Kondo thing of uncluttering my life!
TYGNYBNT. Don't eat your pet and be sure to vote.
73's
Pete N6QW