SimVimCockpit has direct support (since v.0.9.17) of commonly used character LCDs with 4-bit parallel interface, such as 1602/1604/4002 (+ 20x2, 20x4 can be supported). No libraries are used, SimVim firmaware controls the LCD directly.
All standard ASCII Characters and a some of custom symbols can be used to display information on LCDs. Using online SimVim configurator you can easily assign any data to be displayed:
You need to use only 5 signal lines and GND connected to the data bus and one signal line connected to the output pin assigned for this particular display. Four address/data lines S0,S1,S2,S3 should be connected to 4 data inputs of every LCD - D4,D5,D6,D7. The "D" signal of the bus is connected to the "RS" (register select) input of the LCD.
These displays consume very little power from the power source, so you can use +5v from the same SimVim bus. To be able to see something on the screen, you need to add contrast control to the input (V0) using a small potentiometer / trimpot (resistance can be from 1K to 10K Ohm) connected between +5V and GND:
On the other side of the LCD there are two inputs for the backlight LED ( +A - anode, -K - cathode). The "K" input connected to the common GND, and "A" - to the "+" of the power source, which can also be an additional power supply.
Although the backlight LEDs can consume quite much power, you can still connect the A input to the bus +5V instead of an external source. This is especially viable if you use a powerful source for +5v line in your system bus, not taken from the controller board +5 output. Use an additional resistor (50 - 100 Ohm) on the A input in this case.