Hi,
Am 26.10.2015 um 20:57 schrieb wonderph...@posteo.de:
> Hi Nikolaus,
>
> What would it take if someone wanted to use a GTA04 replacement board not
> with a GTA02 case and display but with a different display?
Yes, it is possible. For example the Letux 3704 and Letux 7004 devices use a
GTA04 mainboard with different display.
What it needs:
* connector
- the GTA04 custom board would have two board to board connectors
- or you can use a 39 pin "jumper cable"
* interface PCB
- using matching connectors
- may need level shifter (GTA04 output signals are 1.8V logic levels
and some panels need 3.3V)
- (different) backlight dc/dc converter
- connection for touch screen
- depending on the panel type: LVDS or MIPI converter
>
> The design and the 3D printing of the case might not be that difficult but
> what would need to be done to attach for example the display of an old
> (sp)iPhone?
Well, AFAIK the iPhone displays use DSI (MIPI Display Serial Interface) but the
GTA02/04 panel is 24 bit RGB parallel. So you need a data and signal converter
chip. Toshiba makes some but these are difficult to get and understand and
program.
>
> Would I need another driver or just make some adjustments in the existing
> one? Would it be possible to connect it at all? Do standards exist in display
> connectors or are they all proprietary?
You need a different driver. Although there are informal (e.g. RGB-TTL) and
formal standards (e.g. MIPI-DSI) they only define a framework and each panel is
still different and needs a different control sequence.
So in summary: yes, it is possible and has been done. But you should search for
a matching panel instead of choosing one and trying to interface it.
http://www.panelook.com may help.
>
> Thanks for you insights,
>
> Oliver
BR,
Nikolaus
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