I have a project in mind which I would like to try. A square array of 16x16 leds(yeah that's 256 leds), powered by a PIC microcontroller, so that images can be displayed on it. One way of doing it would involve "setting" each LED one at a time, so each LED that was on would get a pulse at a 1/256 duty cycle. At this duty cycle, to get the equivalent of 10ma output, I would have to power the LED at 2.56amps for that short pulse, or 5amps for 20ma equivalent.
So do you experts think this possible to do without killing the LED?
Also, I would be retracing the display at 60hz, so the pulsewidth would be (1/256)/60 = 65microseconds. Would this be an issue at all? I don't know if LED's have any sort of delay between power applied and when the actual light output begins.
What sort of powering circuit would be recommended to handle these pulses? I would basically be trying to use 2 16bit shift registers to select the row and column.
So do you experts think this possible to do without killing the LED?
Also, I would be retracing the display at 60hz, so the pulsewidth would be (1/256)/60 = 65microseconds. Would this be an issue at all? I don't know if LED's have any sort of delay between power applied and when the actual light output begins.
What sort of powering circuit would be recommended to handle these pulses? I would basically be trying to use 2 16bit shift registers to select the row and column.