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BT81x

EVE3 displays use BT815 or BT816 controllers to handle GUI, touch and audio directly on the display, while the host MCU communicates over SPI or QSPI instead of rendering pixels. This makes it possible to add a touch interface without modifying the existing control system.

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Overview of EVE3 series display

EVE3 is an intelligent display architecture combining a TFT panel, a touch interface and the BT81x Embedded Video Engine. The MCU does not handle rendering or touch processing – it only sends commands, while the controller takes care of the interface and interaction locally.

An external host MCU is still required, which distinguishes EVE3 from STM32 Embedded Displays, where the application runs directly on the module. Unlike HDMI, there is no video stream, but the GUI is generated on the display itself. Compared to standard TFT modules such as HB IPS, both graphics and touch are already integrated.

EVE4 is the next generation, offering higher resolution (up to 1280×800) and features like 2x Pixel Mode. EVE3 remains a good choice for WVGA designs, cost-sensitive projects and upgrades where the existing system should stay unchanged. If requirements grow over time, moving to EVE4 can be done without rethinking the entire architecture. If you’re interested, see our guide.

 

BT81x display features

Display modules use Bridgetek BT815 (capacitive touch) or BT816 (resistive touch), with the choice typically depending on the operating environment and interaction requirements. Capacitive variants support aTouch.

Displays are available in 3.5″, 4.3″, 5.0″ and 7.0″, with resolutions from 320×240 to 800×480 px. Brightness ranges from 320 to 600 cd/m². TFT panels are used, with IPS available in selected variants. 

The interface is SPI or QSPI. A dedicated flash host port improves transfer efficiency. External flash (typically 64 Mb) stores images and UI assets on the display side. ASTC compression reduces memory usage. The controller supports 24-bit RGB888 color and integrated audio output. 

Operating range is -20°C to +70°C, with low power consumption. 

EVE3 is supported by Zerynthfor BT81x controllers (Zerynth r2.2.0), alongside Bridgetek and Riverdi libraries. 

Uses of EVE3 series displays

This display is usually selected when a GUI is needed, but a full system redesign is not. Existing systems can move from buttons or simple displays to a touch interface without changing the core electronics. Kamil Kozłowski, Board Member & Technical Advisor at Riverdi, gives the example of an old coffee machine – buttons can be replaced with a screen while keeping the same simple microcontroller. He sums it up: “Keep your work very simple. Time to market is extremely fast.” 

Industrial control panels use 5″ and 7″ modules where a simple MCU must handle both control and interface. Measurement equipment uses 4.3″ and 5″ displays for compact layouts with clear visualization.

IoT and smart home devices use 3.5″ to 5″ modules where power and space are limited. POS and medical devices use capacitive variants for multi-touch interfaces and clearer user interaction.

Riverdi EVE3 series display manufacturer

Riverdi develops EVE3 displays in cooperation with Bridgetek, the BT81x controller manufacturer. This ensures compatibility at the hardware and integration level. Production is based in Europe, and components are selected for long-term availability. EVE3 remains in active production, which matters in long lifecycle products and upgrade projects.

Standard modules are available without minimum order quantity. Riverdi supports prototyping, low-volume deployment, provides technical support and >custom solutions.