ST7565 LCD Wiring question

[saturno]

Hello everyone,

I've just bought one of these ST7565 LCD to attach to an Arduino.
My unit have 11 holes instead of 9 (to solder wires) that are seen in the tutorial (http://www.ladyada.net/learn/lcd/st7565.html) and about anywhere in the internet where someone talk about these screens.

After this search, it seems to me that the 2 additional connections are RG (Red and Green) negative, that I think they can/should be soldered together.

Can anyone clarify this to me?

Thanks for any help.

[adafruit_support_bill]

Sounds like you have the RGB backlight version of the ST7565. These three wires can all be connected directly to 3.3v for full RGB backlight. They can also be individually controlled to produce any color backlight.

[saturno]

Ok, Let me see if my understanding is right:
these are the the pins I have:

B-
G-
A+
R-
GND
VDD
SD
SCLK
A0
/RST
/CS

the differences are on: B-, G-, A+, R-, the others are the same as the ones in the tutorial.
Reading this, I think that A+ should be the "common" anode for three colors and should be connected to +3.3v
B-, G- and R- are cathode of each RGB color, and should be connected to the negative.
Connecting all three negatives, will light up all colors equally and the back-light color can't be changed.
To be able to control the back-light color "mixture", I should connect R-, G- and B- separately. These are my assumptions, so please correct me if I am wrong.

So, to have this display connected to an Arduino-like and have full color support, what would be a recommended wiring?

I think that I saw anywhere a 9 wire connected display like this (also an ST7565) and it was able to change it's color by software. (example http://www.youtube.com/watch?v=RzdK7Tdi6c8 on youtube) Can you please clarify this?

Thanks for your support.

[adafruit_support_bill]

That is correct. The common anode should go to 3.3v. The cathodes can be individually controlled. If you connect them to PWM pins on the Arduino, you can blend the R, G & B to create a wide range of colors. Since they light the leds by pulling the cathode low, lower PWM values will result in brighter backlight.

[saturno]

In theory it make 100% sens to me.

I'll start using just one color (one wire) and try to evolve from here.
Lets see if I can put full RGB in practice.

Thank you for your support.

Best