```rust
trait Display {
	fn write_cmd(cmd: &[u8]);
	fn write_data(data: &[u8]);
}

trait DisplayRead: Display {
	fn read(cmd: &[u8], data: &mut [u8]);
}

struct SpiDeviceDisplay{
	device: impl SpiDevice,
	dc: impl OutputPin,
}
impl Display for SpiDeviceDisplay {..}

struct ExclusiveDisplay {
	bus: impl SpiBus,
	cs: impl OutputPin,
	dc: impl OutputPin,
}
impl Display for ExclusiveDisplay {..}
impl DisplayRead for ExclusiveDisplay {..}

struct RefCellDisplay {
	bus: &RefCell<impl SpiBus>,
	cs: impl OutputPin,
	dc: impl OutputPin,
}
impl Display for RefCellDisplay {..}
impl DisplayRead for RefCellDisplay {..}

struct CriticalSectionDisplay {
	bus: &critical_section::Mutex<RefCell<impl SpiBus>>,
	cs: impl OutputPin,
	dc: impl OutputPin,
}
impl Display for CriticalSectionDisplay {..}
impl DisplayRead for CriticalSectionDisplay {..}

struct MutexDisplay {
	bus: &std::sync::Mutex<impl SpiBus>,
	cs: impl OutputPin,
	dc: impl OutputPin,
}
impl Display for MutexDisplay {..}
impl DisplayRead for MutexDisplay {..}