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What is a Display Driver?
A display driver is usually an IC (integrated circuit) which provides an interface between a microprocessor, microcontroller, or other peripheral interface and a particular type of display device, such as an LCD, LED, etc.
Display drivers aren’t always an IC though and alternatively could comprise a state machine made of discrete logic and other components.
The display driver will typically accept commands and data using a serial or parallel interface, such as TTL, CMOS, RS232, SPI, I2C, and generate signals with suitable voltage, current, timing, and demultiplexing to make the display show the desired numbers, text or images.