Matrix question

[Electronman]

Hi,

How to turn the center led of an matrix off in a matrix of leds while the other leds are lighten (whole must be lighten except of the center one)?

 

[Willbe]

Post the present schematic.

 

[Electronman]

Post the present schematic.

I have no scheme, just somebody asked me if a matrix made of an X positioned IC and a Y positioned IC is able to do so somehow?

 

[Electronman]

Please just tell me if doing so is possible or no? I just want to know about the possibility?

 

[House0Fwax]

If the display is multiplexed, then yes, it it possible.

 

[Electronman]

What to do you mean by that?
How to do so?

Thanks

 

[House0Fwax]

For example;
If you have a 5 x 7 matrix of LEDs then you'd have 5 rows and 7 columns.
Now then, to light a particular LED (I.E. top left) you'd need to apply power to row 1 and ground column 1.

OK, so if you wanted another LED lit on row 1 you ground the column that it is in. Next, you switch power from row 1 to row 2 and ground the columns that you want lit.

Do this for all rows one after the other really quick and you can have whatever you want on the display. You have to do it quick because then your eyes will see a complete image even though only one row is lit at any one time.