LCD Question B+ and B- are for Backlight Power?

Parts Questions
1

Below is the 2x16 LCD Pinout Diagram for an LCD I have… The only issue is that I do not have a B+ and B- on the pin headers.

Unlike some LCD’s, this has a 2row by 7 (14 total) female socket connector. All the items you’d expect are there except B+ and B-; I am wondering what these inputs do (are they backlight power, for instance?)

NO.  Symbol        Function

1      VCC          Power supply for Logic circuit

2      VSS          Ground (0V)

3      V0            Power Supply for Driving the LCD

4      RS            Data / Instruction select

5      R/W          Read / Write select

6      E              Enable signal

7-14  DB0-DB7    Data Bus line

On the right of the LCD, there are two connectors, labeled A and K, for the LED backlight. I just don’t want to fry the LCD, as money is a bit tight. This panel was $6.95, which for a local buy seemed pretty good. for new, bagged equipment. If anyone else wants one, I can buy them and ship them in the US for price plus materials and shipping (maybe around $10-11).

Full Specs here:

http://www.compel.ru/pdf/lcd/DataVision/DV-16230.pdf

2

B+ and B- are for the backlight - so just connect them to A and K.

A stands for Anode and K for Kathode of the LED backlight.

You cannot fry the backlight (if you use the B+ and B- from the core!). Just change A and K if it doesn’t light up :wink:

3

Thanks so much, Raph. I figured that was it, but wanted confirmation from a second source. 1 more bit of knowledge added to the brain bank.

EDIT: Yes, tested and the A and K are the BL. Need to get a connector for the socket today so I can wire it up.

4

This is odd. I don’t seem to need the AK leads at all. I wired it up last night, and the moment you apply power to the logic circuit on the LCD (pins 1 and 2), the device lights up. In fact, it cannot be made to NOT light up, it seems.