FAQ - Frequently Asked Questions - Display interface selection: SPI, RGB, LVDS, MIPI or HDMI?

Intro

The display interface determines bandwidth, PCB complexity, cable length, EMI behaviour, processor compatibility and software effort.

Selecting the wrong interface can limit display performance or make integration unnecessarily complex.

Key technical selection criteria

Evaluate:

display resolution
refresh rate
colour depth
cable length
processor interface support
PCB layer count
EMI sensitivity
software driver support
power budget
mechanical layout

SPI

Use SPI for:

small displays
low data rates
simple wiring
low pin count

Limitations:

limited bandwidth
not ideal for high-resolution video
slower refresh for larger displays

RGB parallel

Use RGB for:

embedded TFT displays
moderate resolutions
direct processor connection

Limitations:

high pin count
layout complexity
limited cable length

LVDS

Use LVDS for:

higher resolution displays
longer internal cables
better noise immunity

Limitations:

requires compatible transmitter/receiver
more design planning

MIPI DSI

Use MIPI DSI for:

compact high-resolution displays
modern processors
high-speed display links

Limitations:

strict layout requirements
software support must be checked

HDMI

Use HDMI for:

external displays
standard monitor output
development or industrial panels

Limitations:

less ideal for deeply embedded compact HMI
connector and licensing considerations may apply

Common mistakes

selecting a display before checking processor support
using SPI for a display that needs fast refresh
ignoring cable length
underestimating EMI
forgetting software driver availability
not reviewing connector and mechanical constraints

Decision checklist

Before selecting an interface, define:

display resolution
refresh rate
processor support
cable distance
EMI requirements
available PCB space
software driver availability
production lifetime

Need help matching a display with your processor or embedded platform? Contact TOP-electronics.

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