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Topic starter
So, I want to make a project very similar to the "Turning a broken smartphone into a laptop" one. But I have one key question. The display board has 3 ports on the bottom (4 on the one I found, but the 4th one isn't relevant here) two USB-Cs (one for power and one for video) and a mini HDMI port. My question is, can the mini HDMI port work as video out from the laptop (much like commercial laptops can output to an external screen through an HDMI port) or not? Thanks!
Posted : 15/06/2025 3:33 am
Do you have the spec for the board to hand? Mini HDMI is just HDMI but with a smaller receptacle as I recall. It's primarily for space issues as the full-size one is quite large (compared to a SBC for example).
Take everything I say with a pinch of salt, I might be wrong and it's a very *expensive* way to learn!
Posted : 15/06/2025 6:29 pm
Topic starter
These are the specs that are listed:
14 inch 1366X768 EDP panel:
size: 14 inch
Resolution :1366(RGB)×768
Display Area 309.31× 173.99 mm (H×V)
Brightness 220cd/m² (Typ.)
Contrast Ratio 500:1 (Typ.) (TM)
Viewing Angle:45/45/20/40 (Typ.)(CR≥10) [Left / Right / Up / Down]
Frame Rate :60HZ
Interface Type :eDP (1 Lanes) , eDP1.2 ,30 pins Connector
Power Supply:3.3V
EDP Type C Controller Board :
Mini HDMI Type-C EDP Board Work for EDP panel
Input Power Adapter:5V-3A Power by Micro USB or the Type C port
Come In Standby Model When Not Input Signal
Standby Model <1W
Video Input: mini HDMI Type-C
Audio Input: mini HDMI TYPE-C
OSD: Brightness Contrast Auto Language And So On
Board Size:82mm x 59mm x 4mm
What I'm not sure of is if the mini HDMI port is only for input or if it can also output to another screen (It'd be kinda weird since the phone would output to both the "laptop's" display and the external display, but yeahh)
Posted : 16/06/2025 1:37 am
Chaining HDMI specifically isn't supported officially, but it can be done with the right hardware in the monitor or (more usaully) with MST over USB-C/Thunderbolt.
That one is, I believe, HDMI in only. Generally monitors that support chaining come with multiple HDMI inputs. I grabbed a couple from a local Aldi a few months back that had mini-HDMI and USB-C but I don't think they can be chained.
Multi display technology is usually provided by the host device which would be your phone in this case so that's unlikely to be the case. Never say never though...
Take everything I say with a pinch of salt, I might be wrong and it's a very *expensive* way to learn!
Posted : 16/06/2025 10:32 am
Topic starter
@marcdraco Ah, got it. Thanks then! I'll probably have to figure out some other way to implement it
Posted : 16/06/2025 1:09 pm
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