Panasonic LED Dot Matrix Display

[Andrew M]

Hi all,
Does anyone have a datasheet for a :-
Panasonic LNP175011 LED Display Panel ?

Its a 32 by 16 dot matrix display of 5mm tri-color LEDs. Used in scrolling
LED signs etc.

On the PCB are 2x 32-bit shift registers, 2x 3to8 decoders, a timing IC, and
lots of transistors for driving the rows and columns. There are adjustments
for (presumably) red and green brightness.
I think the shift registers drive 32 red columns and 32 green columns, then
I guess the decoders select the row. Not sure about the timing though.
Data gets in via a small IDC connector, and further displays can be
daisy-chain connected (Each board has an IN and an OUT connector, plus
power)

The only data sheet I can find on the web is a 1 page description of power
supply details (5v) and dimensions. No data format, pinout, timing spec
etc. Can anyone else shed more light on it?

Many Thanks,
Andrew

 

[James Sweet]

Hi all,
Does anyone have a datasheet for a :-
Panasonic LNP175011 LED Display Panel ?

Its a 32 by 16 dot matrix display of 5mm tri-color LEDs. Used in scrolling
LED signs etc.

On the PCB are 2x 32-bit shift registers, 2x 3to8 decoders, a timing IC, and
lots of transistors for driving the rows and columns. There are adjustments
for (presumably) red and green brightness.
I think the shift registers drive 32 red columns and 32 green columns, then
I guess the decoders select the row. Not sure about the timing though.
Data gets in via a small IDC connector, and further displays can be
daisy-chain connected (Each board has an IN and an OUT connector, plus
power)

The only data sheet I can find on the web is a 1 page description of power
supply details (5v) and dimensions. No data format, pinout, timing spec
etc. Can anyone else shed more light on it?

Many Thanks,
Andrew

Look up the datasheets for the devices used. Data rate is not fixed, you can
send it as fast as the shift registers can accept it. The multiplexing
control is done in software in the microcontroller driving the display
panel.

 

[Andrew M]

Look up the datasheets for the devices used. Data rate is not fixed, you
can
send it as fast as the shift registers can accept it. The multiplexing
control is done in software in the microcontroller driving the display
panel.

Yeah, thats how I got where I am. What's with the timing IC (think it's a
74series dual monostable multivibrator IIRC, don't have the board with me.)
What about pinouts and row selection?

Can't take a board apart very easily to trace it, as there's 512 3wire LEDs
soldered to the other side.

I know my microcontroller (not sure which yet) will have to pump out the
data to do 1/16 multiplexing. Shouldn't be too difficult.

Andrew