Zhihuijun produces portable pocket monitor & power bank

This is a portable pocket monitor (& power bank) designed and produced by Zhihui Jun to solve personal pain points. There is no room for improvement in terms of appearance~ The final product has a relatively high degree of completion, so I will share it as an open source. The screen display part is based on another previously open source project HDMI-PI. The associated warehouse address is here: https://github.com/peng-zhihui/HDMI-PI. The video demonstration of the project: https://www.bilibili. com/video/BV17D4y1X7AT
Regarding screen selection
, as mentioned in the video introduction, MIPI is not a universal interface, and driver firmware needs to be customized for different screen modules. This is more complicated, so I recommend that you directly use the firmware I compiled. Burn.
The screen model is a 5.5-inch 1080P IPS screen. I bought it here (not for advertising). The 5.5-inch TFT screen IPS 1080*1920 brightness 300 MIPI
is not expensive at only 100 yuan. The display effect is still ideal.
Some explanations about the circuit:
The current of the power bank will be relatively large when fast charging, so the PCB has a window treatment. When welding, remember to add more solder to the window area to increase the thickness of the wire. 
The design of the HDMI to MIPI board uses a 0.5mm FPC cable, which can actually be replaced by PCB traces. The reason for my design here is to leave an interface for future expansion and debugging of other types of screens. Of course, if you don't have this need, you can change the circuit so that welding and materials will be easier. However, the MIPI wiring must comply with the signal integrity rules (equal length, impedance). 
The resistance of the LED can be adjusted by yourself. The current resistance in the schematic diagram is slightly brighter; the brightness of the screen's backlight is adjusted by the 10R potentiometer. 
The power bank has a function button. Press it once to check the battery level, and press it twice to force the output to turn off. If the PD protocol is turned on, an indicator light on the far left will light up. It will not light up for normal 5V charging. 
When buying power bank batteries, be careful to buy ones that do not require a protection module, because the board has already integrated a protection module, or you may not solder the protection module and use it with a protected battery core. 
The copper pillars and PCB are fixed by soldering. The assembly sequence must be considered, otherwise it will be more troublesome to disassemble.