Does a TVS diode provide adequate protection for an LCD screen powered from a car 12V outlet?
The backlight says it has a maximum rating of 21V, the LCD says 3.3V. It appears that the module has some kind of regulator to step down the voltage to 3.3V.
The diode will protect against events above ~17V as it starts to conduct at this point, however these TVS diodes work best against short transient events. The diode can take 60A of current, but only for a short duration. If the diode starts conducting during a long duration event, it can handle about 2W before it heats up enough to exceed it's max temp. Above 17V it would only take 100-200mA to cause a problem with heating the diode to exceed its max temp if it's heatsink is air. If you think the surge will exceed this then use more diodes or add a diode that can handle more current in parallel