what FET is suitable for LED matrix display?

[karthi_keyan]

hai all ,


presently am design led matrix display system.i tried with 16*16 with ULN .its look brighter when a single row is powered while powering the 16 rows the current is not enough and LED lost its brightness .so i referred some topics they suggest to put a FET . i need a part number which is suitable for my application?


NOTE:i will extend my 16*16 up to 16*128.

regards,
karthikeyan

 

[pranam77]

I personally do not recomend the use of FET in a matrix. I have seen the life of LEd's drastically decreasing when done. may be it is because, the FET's are forms of direct swicth in between without any drop. I have used MJE3055 for NPN or MJE2955 for PNP with best results and longer life of LED's. Cheers

 

[FvM]

FETs are promising slightly higher efficieny and cicuit simplification, because you don't need to provide a base current. Assuming
suitable current limiting, I don't see a particular problem of LED lifetime with FET multiplex drivers.