Picking the right TFT display controller is key to system performance, power consumption and long-term product stability. ILI9341, ST7789 and ST7735 are three controllers that are used a lot in embedded display applications, and each one is designed to meet different needs.

This comparison shows the main differences to help you make an informed choice.

Controller Overview

ILI9341 Display
A mature and highly stable TFT controller, typically used with 240×320 QVGA panels (2.4"–3.2"). It supports multiple interfaces and is common in industrial and HMI products.

ST7789 Display
A newer controller designed for compact and square displays such as 240×240 and 240×280. It is widely used in modern UI and portable devices.

ST7735 Display
A cost-focused solution for small TFT screens, usually 128×160 resolution, suitable for simple graphics and entry-level projects.

Resolution and Size

Interface and Performance

ILI9341: SPI and parallel interfaces, higher refresh capability 

ST7789: Mainly SPI, optimized for faster updates

ST7735: SPI only, suitable for static or simple UI

If interface flexibility or refresh speed matters, ILI9341 is the stronger option.

Power Consumption

ST7735: Lowest power usage

ST7789: Optimized for battery-powered devices

ILI9341: Higher consumption, but stable for industrial systems

Software Support

ILI9341: Most mature libraries and long-term support

ST7789: Good modern framework support, some panel variations

ST7735: Simple and easy to drive 

Application Recommendations

Choose ILI9341 Display for industrial HMIs, instruments, and long-life products.
Choose ST7789 Display for compact devices and modern UI layouts.
Choose ST7735 Display for low-cost, small-size, simple display needs.

Conclusion

There is no single best controller for all projects. The ILI9341 display offers proven stability and flexibility, while ST7789 and ST7735 better suit compact and cost-sensitive designs. Selecting the right controller depends on resolution, interface, power budget, and product lifecycle.