Overview
As a software engineer, when debugging RUBIK Pi 3, I was troubled by the fact that RUBIK Pi 3 did not have a DSI interface. I had to carry an additional portable HDMI screen, HDMI cable, and screen power supply around, which was inconvenient.
So the idea of designing a compact, exquisite, high-resolution, high-color, touchable screen that can be integrated with RUBIK Pi comes to me, something like the example below:
Chip selection
At present, the vast majority of small, high-resolution, and high-refresh rate screens use the MIPI interface, while RUBIK Pi only provides an HDMI output. Therefore, the screen can only be driven by converting HDMI signals into DSI signals.
I select the LT6911 chip from a Chinese manufacturer Lontium to convert HDMI to DSI. The chip can convert HDMI signals into CSI or DSI signals. (RUBIK Pi 3 uses the LT9611 chip to convert the SoC’s DSI to HDMI, and here I use the LT6911 to convert it back to DSI. I’m still checking how well this will work.)
To be continued…
2025-06-30T16:00:00Z
Original post: HDMI 转 MIPI 模块，DIY 记录 - 硬件扩展 - RUBIK Pi by Hongyang Zhao