Rockchip RK628D Video Bridge IC for Embedded Display Applications

Product Overview

The Rockchip RK628D is a video interface bridge chip designed to support flexible connectivity between embedded application processors and display or video devices.

According to Rockchip's published product information, the RK628D supports HDMI, parallel RGB and BT.1120 video inputs, together with multiple output interface options, including V-by-One HS, dual LVDS, dual MIPI DSI, MIPI CSI, HDMI 1.4, RGB and BT.1120.

The chip integrates video scaling and interface conversion capabilities for embedded display systems. The available conversion paths, output timing and maximum resolution depend on the selected interface combination and applicable hardware configuration.

Key Features

Multiple Video Interface Options

The RK628D supports a range of video input and output interfaces for embedded display and video connectivity applications.

Available interfaces should be evaluated according to the target system's signal format, timing requirements, physical connections and software implementation.

High-Resolution Video Input

Rockchip's published specifications list HDMI input support up to 4K at 60 frames per second under specified conditions, including YUV420 input.

Maximum resolution and frame rate depend on the interface, color format and supported conversion path. The input specification should not be interpreted as a guarantee that every output interface supports the same resolution and frame rate.

Video Scaling and Conversion

The RK628D provides integrated video scaling and interface conversion functions. Rockchip's published product information describes scaling from one-quarter to four times.

Confirm the supported scaling range, output timing and format limitations for the intended application using the relevant documentation.

Multi-Display Connectivity

The device provides multiple output interface options, including dual LVDS and dual MIPI DSI.

The suitability of a specific dual-display configuration depends on the input signal, output combination, resolution, timing and system implementation. Confirm the intended signal path before hardware design.

Typical Applications

Multi-screen commercial displays & advertising machines: HDMI IN → Dual MIPI/LVDS OUT for dual-screen expansion

4K large-screen conversion: 4K HDMI IN → 4K GVI OUT for TV GVI panels and commercial strip screens

Smart projectors: HDMI IN → MIPI_CSI OUT, with cascading for multiple CSI channels

Wireless screen casting / docking stations: HDMI IN → MIPI/LVDS OUT for dongle display expansion

Video capture & conversion: HDMI IN → MIPI_CSI OUT, up to 4K, for gimbal/drone video transmission and live capture cards

Automotive displays & industrial HMI: Wide-temperature capability for infotainment and medical monitors

FAQ:

Q:What is the Rockchip RK628D?

A:The RK628D is a video interface bridge chip designed to support conversion between supported video input and output interfaces in embedded display systems.

Q:Does the RK628D support 4K video?

A:Rockchip's published specifications list HDMI input support up to 4K@60fps under specified conditions. Maximum output resolution and frame rate depend on the output interface and selected conversion path.

Q: What exactly does “24-in-1” mean?
A: It refers to the chip supporting 3 input interfaces (HDMI, RGB, BT.1120) and multiple output interfaces (dual MIPI, dual LVDS, GVI, HDMI, RGB, BT.1120, etc.) in flexible combinations, forming 24 video conversion paths covering mainstream interface standards from consumer electronics to industrial displays.

Q: What are the practical benefits of the built-in MCU?
A: Traditional bridge chips typically require an external host SoC for configuration and control. The RK628D's built-in MCU enables standalone operation, eliminating the need for an additional host in applications requiring only display interface expansion or protocol conversion, reducing BOM cost and shortening development time.

Q: Can this chip drive two displays simultaneously?
A: Yes. The RK628D supports simultaneous output on two interfaces at the same resolution, typically HDMI IN → dual MIPI/LVDS OUT, suitable for advertising machines, POS systems, and dual-screen expansion scenarios.

Q: What about the software ecosystem and replacement convenience?
A: The chip is based on the DRM and FB display frameworks, offering good software compatibility and relatively straightforward driver integration or replacement under Linux/Android. Rockchip provides RK628D HDMIRX2GVI DemoBoards and development guides for rapid validation.

Q: What does the -40℃ to +125℃ operating range mean?
A: This range covers industrial and automotive-grade requirements, allowing the RK628D to be used in automotive infotainment, outdoor advertising machines, and industrial control panels with significant ambient temperature fluctuations, without additional thermal control or derating.

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