7-segment LCD's question!

[brodin]

I have bought a 6 digits 7-segments LCD.
https://www.elfa.se/elfa/produkter/en/2011641.htm

How do these kind of displays work? I find just one pin that i don't know what it is. That's "B.P" What's that?

By the fact that i just find one pin that is unknown for me, i guess that that pin is ground, and when i connect +5V to someone of the other pins the representing "led" will turn on. Am i right?

I can't find a datasheet for it so i don't know what pins representing what "leds".
The pins are named:
1A
1B
1C
1D
1E
1F
1G

I suppose that these pins represents the first digit, but which ones represents which "led" of the first digit?

 

[crust]

Apply power and grounding the suspected ground pin is the right idea, but 5V will probably cook the LEDs, most run of 2-3 volts.

In any case, regarding the abc.... look at this page, it will tell you which letter goes to which segment:

**broken link removed**

 

[Sebi]

For LCD driving need AC voltage. The common called Back-plane (BP). When the segment voltage (AC) reverse-phase as BP the segment is active (black or white: depend from polar-filter position).

 

[brodin]

For LCD driving need AC voltage. The common called Back-plane (BP). When the segment voltage (AC) reverse-phase as BP the segment is active (black or white: depend from polar-filter position).

I don't really understand what you mean?

If i only have one pin, how can i connect an AC voltage then?

How can i make a 3-4 volt AC from a 9V battery? Is that possible?

 

[elec_lover]

read first part of this articles: **broken link removed**
http://www.liquidcrystaltechnologies.com/DrivingShutter.htm
**broken link removed**

DC will possible damage the LCD display !

 

[brodin]

elec_lover: Thanks for the good links!

I was planning to multiplex this LCD, but i suppose that wouldn't be possible.


I was thinking of connect all wires (A-G) of all digits parallel, and control with the ground on each of the digits which one to set, which would mean i just need (7 + 6=13) uC ports to control the display.
That would be possible with led displays, right?
But that wouldn't work here, would it? I mean i can't control what digit to write to. If i put all the lines parallel i will set the same number to all digits.

 

[Sebi]

The LCD with one backplane (BP) can't work in multiplex mode.
MUX method on LCD need staircase signal, this is more complicated.
Use shift registers (e.g.CD4094) for each digit:need only 3 wires from processor...