We need a picture of the entire pcb. The ribbon cable (technically a flex pcb, not a ribbon cable) is totally custom and not something you can put a signal on. The little green pcb looks like the driver, so we would need pics of that and maybe figure out where you can input some kind of signal.
These kinds of displays can be really hard te re-use. Often their driver is just a simple blob (chip on board) which would be completely custom. This can be made cheaply to order with as few as 500 units. So mass produced readers often use completely custom stuff to get down to a really low price. Unfortunately this means it’s not possible te repurpose the screens later.
Spi is the norm for hobby displays because they are made to be driven easily. There is a driver chip that receives the spi signal and drives the display. With an actual product this often isn’t the case and the screen gets driven directly.
Dude your breath probably smells and people are too polite to tell you.
On your tongue there are a lot of anaerobic microbes (on everybody’s tongue, it isn’t a hygiene thing, they just live there). When you have your mouth closed for a long time, it creates a oxygen poor environment and these microbes thrive in that. They cause bad breath, so after people sleep or simply have their mouth closed for a while, the breath starts to stink. If you look in a mirror and your tongue has a kinda white or brownish tinge, this is because of the microbes. Everybody should brush their teeth and especially their tongue after sleeping. When looking in a mirror the tongue should be entirely pink and look healthy. Clean the tongue as far back as you can, to prevent bad breath.
If you smoke this isn’t true, your breath will stink no matter what.
So for your teeth it probably won’t matter much not brushing in the mornings, but for your breath it matters a lot.