Posted: 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?
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