As we all know, today's mobile phone screens are of very high quality and low price (after all, supported by the popularity of smartphones, they are very cheap to buy as maintenance accessories). Compared with most desktop monitors, they have very unrivaled resolution, pixel density, Viewing angles, color reproduction and even refresh rates.
As everyone knows, the author has a persistent pursuit of small and exquisite electronic products, but it is almost impossible to find a mini display made of a mobile phone screen on the market, so this project is to solve this need. As for the use of a mini HDMI display, development boards such as TV boxes, SLR cameras, and Raspberry Pi all have HDMI interfaces. Isn’t it great for plug-and-play high-resolution screens that you can carry around with you?
Hardware Principle
At present, most mobile phone screens and small high-resolution and high-refresh rate screens are basically MIPI interfaces. Compared with RGB, LVDS, SPI and other interfaces, MIPI is a very powerful high-speed interface. It is divided into CSI and DSI. Specifications (yes, the DSI reserved on the Raspberry Pi), the number of lanes can be freely configured according to bandwidth requirements, and the transmission rate of each lane exceeds 1Gbps.
HDMI is the most commonly used video interface, and almost all video output devices have an HDMI interface.
**So what we need is a HDMI to MIPI hardware module. **There are several solutions to achieve this goal, including FPGA or ASIC chip.
There is an open source solution using FPGA here: https://hackaday.io/project/364-mipi-dsi-display-shieldhdmi-adapter
He used Spartan-6 FPGA to successfully drive the iPhone 4 screen and receive HDMI signals. Enter, please refer to it if you are interested.
Because I am not very familiar with FPGA, I designed it using an ASIC-specific IC solution.
All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.
It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.
Supported by EEWorld Datasheet