What This Project Does

This project lets you turn a phone screen into a portable high-resolution monitor that works with any device that has an HDMI port. Imagine plugging a tiny, super-sharp display into your action camera, Raspberry Pi, or streaming device — that's the goal. Phone screens have become incredibly cheap as spare parts, offer stunning pixel density and color accuracy, yet nobody sells standalone monitors using them. This hardware module bridges that gap.

How It Works

The core problem is simple: phone screens use a connector standard called MIPI (which is also what Raspberry Pi cameras use), while most devices output video through HDMI. This project is a hardware converter that takes an HDMI signal and translates it into the MIPI format that phone screens understand. The creator explored two different chip approaches. The first uses a Toshiba IC (TC358870) that's already used in AR glasses — powerful but hard to find documentation for. The second uses a Chinese chip (LT6911) that's cheaper and simpler but even less documented. Both designs are shared in the repository along with schematics and firmware code.

Who Would Use This

Anyone who wants a compact, high-quality display for portable devices or development boards. Video creators could attach one to a camera for on-set monitoring. Maker projects and single-board computer hobbyists could use it as a development display. The 5.5-inch example shown in the README achieves display quality that would be hard to match in traditional small monitors at similar cost.

What Makes It Interesting

This is a reverse-engineering and design project. The original creator spent significant effort obtaining manufacturer datasheets and technical documentation that companies rarely release publicly, then open-sourced the designs so others could build or improve upon them. The firmware work is ongoing — one developer has already implemented the Toshiba version, and the creator is actively seeking community contributions to complete the Chinese chip variant.