adafruit_support wrote:LCD displays have notoriously slow response times. What you are seeing is known as "ghosting" and is a property of the display.
adafruit_support wrote:OLEDs and VFDs are definitely faster.
A word of caution regarding OLEDs though: The 16x2 OLEDs use a controller that is almost compatible with the common HD44780 LCD controllers. However, the timing and initialization are different and the spec-sheet is largely a work of fiction. Be prepared to do a bit of experimentation when programming it.
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