Smooth Scrolling in moving message problem

[microcon555]

Hi everyone

On my moving message display (7x96), while moving the text slowly, i can see the font become thick (i.e. a ghost image of the font) which cant be seen while moving fast.

To avoid this what are the things that should be noted on?

 

[engshahrul]

You need turn-off all LED Matrix before load new next display.

 

[madhan7710]

Hello All,

Am also facing a situation similar to this thread. My problem is the static display works very nice with good brightness. when i scroll a message that to works very nicely with slightly slanting character which scrolls in very high speed. here also the display brightness is good. Now if try to control the speed by simply repeating the frame for times the message is scrolling slowly but a doubling effect (ghosting) comes and the character scrolls in a straight condition (previously it was scrolling slantingly). What could be the problem? Kindly give some ideas to overcome this issue. Given below are my display details.

Display : 7 x 96
Scanning : Row
Row Drivers : Mosfet
Column Drivers : 16Ch Constant Current Led Drivers
Frame Rate : 65 - 120 hz (i tried to change the frame rate inbetween these limits to overcome my problem but result are same)

for speed control i tried the following 2 methods...

 for(i=0;i<=speed;i++)
{
for(row=0;row<=7;row++)
{
load column data;
select particular row;

}   
}

for(row=0;row<=7;row++)
{
for(i=0;i<=speed;i++)
{
load column data;
select particular row;
}   
}

in the first method am getting ghosting effect... in the second method am not getting ghosting effect but led flicking a lot...

If there is no speed control the display works very nicely but very fastly...

Looking for a solution. Thanks in advance.