joeggeli
Posts: 1
Joined: Mon Nov 20, 2017 1:45 pm

Portable Raspberry Display Power Supply

Mon Nov 20, 2017 2:04 pm

Hello.

I want to build a portable gaming console with the Raspberry Pi 3. The power source will be a LiPo battery.

Now I've been looking at some display on Digi-Key and I'm not really sure what to look for.

First, what type of connector? HDMI or parallel?

Second, the power supply of the display. For example on one display on Digi-Key it says this.

TFT Supply Voltage
min. 3.0 V
typ. 3.3 V
max. 3.6 V

Backlight Supply Voltage
min. 17.4 V
typ. 19.2 V
max. 19.8 V

And then there is this note: The LED of the backlight is driven by current drain; drive voltage is for reference only. Drive voltage must be selected to ensure backlight current drain is below MAX level stated.

I don't really understand what this means. My first guess was that the display requires a separate power supply with 17.4 -19.8 V which wouldn't really make much sense for such a small display? And then I read the above note and now I'm totally lost.

Link to the said display:
https://www.digikey.ch/product-detail/e ... ND/6650305

User avatar
fruitoftheloom
Posts: 15096
Joined: Tue Mar 25, 2014 12:40 pm
Location: Bognor Regis UK

Re: Portable Raspberry Display Power Supply

Mon Nov 20, 2017 2:25 pm

joeggeli wrote:
Mon Nov 20, 2017 2:04 pm
Hello.

I want to build a portable gaming console with the Raspberry Pi 3. The power source will be a LiPo battery.

Now I've been looking at some display on Digi-Key and I'm not really sure what to look for.

First, what type of connector? HDMI or parallel?

Second, the power supply of the display. For example on one display on Digi-Key it says this.

TFT Supply Voltage
min. 3.0 V
typ. 3.3 V
max. 3.6 V

Backlight Supply Voltage
min. 17.4 V
typ. 19.2 V
max. 19.8 V

And then there is this note: The LED of the backlight is driven by current drain; drive voltage is for reference only. Drive voltage must be selected to ensure backlight current drain is below MAX level stated.

I don't really understand what this means. My first guess was that the display requires a separate power supply with 17.4 -19.8 V which wouldn't really make much sense for such a small display? And then I read the above note and now I'm totally lost.

Link to the said display:
https://www.digikey.ch/product-detail/e ... ND/6650305

It is probably best to look for a display from a vendor who offers support, like:

http://www.neosecsolutions.com/
My only "PC" is an Asus ChromeBit running ChromeOS, cloudcentric at its best !
Rockchip Quad-Core RK3288C SoC as used in ASUS Chromebook C201 & Chromebook Flip C100PA as well as the Tinker SBC.
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User avatar
rpiMike
Posts: 355
Joined: Fri Aug 10, 2012 12:38 pm
Location: Cumbria, UK

Re: Portable Raspberry Display Power Supply

Mon Nov 20, 2017 2:47 pm

https://www.amazon.co.uk/Elecrow-Monito ... y+pi&psc=1

5 Volt power - same as Pi, mounts directly onto Pi, hdmi so no drivers for the display, also touch screen (although not the most accurate in my experience)

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Imperf3kt
Posts: 360
Joined: Tue Jun 20, 2017 12:16 am
Location: Australia

Re: Portable Raspberry Display Power Supply

Mon Nov 20, 2017 9:19 pm

rpiMike wrote:
Mon Nov 20, 2017 2:47 pm
https://www.amazon.co.uk/Elecrow-Monito ... y+pi&psc=1

5 Volt power - same as Pi, mounts directly onto Pi, hdmi so no drivers for the display, also touch screen (although not the most accurate in my experience)
Looks like another Waveshare clone.
Pi3b - 'normal use' temperature (25% CPU load) 76℃, ambient 21℃

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HawaiianPi
Posts: 1407
Joined: Mon Apr 08, 2013 4:53 am
Location: Aloha, Oregon USA

Re: Portable Raspberry Display Power Supply

Tue Nov 21, 2017 7:23 am

Imperf3kt wrote:
Mon Nov 20, 2017 9:19 pm
Looks like another Waveshare clone.
Yup, and for my fellow American Raspberry Pi users, this looks like yet another clone on Amazon USA for much less.
Stutu 5 Inch Touch Display for Raspberry pi 3 ($25.88! That's less than 20 British Pounds).
My password is the last 8 digits of Pi.

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