Puppy Linux Discussion Forum Forum Index Puppy Linux Discussion Forum
Puppy HOME page : puppylinux.com
"THE" alternative forum : puppylinux.info
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

The time now is Sat 19 Apr 2014, 08:41
All times are UTC - 4
 Forum index » Advanced Topics » Hardware » Video
problems :LED matrix for video display
Post new topic   Reply to topic View previous topic :: View next topic
Page 1 of 1 [1 Post]  
Author Message
AlyssaLucy

Joined: 10 Feb 2014
Posts: 1

PostPosted: Mon 10 Feb 2014, 23:07    Post subject:  problems :LED matrix for video display  

my name is lucy and I'm a engineer. I'm trying to develop rgb led matrix (3535 diode series) which will allow me to display video signals.

The schematic of my panel is quite simple: a common anode RGB led matrix (8x16), a demultiplexor to select the lines attacking the gate of DUAL P-MOSFETs and the cathodes of the RGB LED connected to the drivers TLC59283 for each color.

I have tested the design and it works but I have some issues and questions:

1- MOSFETs (source connected to Vcc and drain to the common anode lines) provide current for RGB LEDs. As the tracks are some centimeters of length they suffer drop voltage so sometimes the LEDs in the same line do not bright the same. I think that I just should use wider tracks or more copper. Is this right?

2- For each color (drivers) I use a different external resistors to make the white balance. Is there an IC that will allow me to control this white balance electronically?

3.- Calibration. As different matrixs of LED (8x16) get older, when putting them together they have differents hues and you can appreciate the differences in their white color display. Do you know a solution to keep them all or to make an automatic adjusment of this devices?

Thanks in advance
Back to top
View user's profile Send private message 
Display posts from previous:   Sort by:   
Page 1 of 1 [1 Post]  
Post new topic   Reply to topic View previous topic :: View next topic
 Forum index » Advanced Topics » Hardware » Video
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group
[ Time: 0.0314s ][ Queries: 12 (0.0037s) ][ GZIP on ]