It is a User Interface product , which contains more than 50 LED's and it is matrix driven which contains 16 column and 3 rows.Currently we are using this LED part number LW QH8G-Q2S2-3K5L.
We have difficulty in lighting up the LED’s with the desired intensity.
We have three rows, when we handle single row through software we get the desired brightness, but if we handle 2 or 3 rows the brightness of leds comes down. Because we are selecting rows one by one, and hence each row gets 33% of the time slot.
Duty cycle is 0.33 and scan time of single row is 2ms , from the permissible pulse handling capacity graph we conclude to go for 22mA to increase the brightness,as per datasheet maximum forward current of the LED is 15mA but our value is 22mA
is that will affect the reliablity ,life time and junction temperture of LED?
whether we are going in the right way?
Whether the LED will handle that much current ?
Please guide us to proceed further in this analysis.
Regards
Vinoth G
We have difficulty in lighting up the LED’s with the desired intensity.
We have three rows, when we handle single row through software we get the desired brightness, but if we handle 2 or 3 rows the brightness of leds comes down. Because we are selecting rows one by one, and hence each row gets 33% of the time slot.
Duty cycle is 0.33 and scan time of single row is 2ms , from the permissible pulse handling capacity graph we conclude to go for 22mA to increase the brightness,as per datasheet maximum forward current of the LED is 15mA but our value is 22mA
is that will affect the reliablity ,life time and junction temperture of LED?
whether we are going in the right way?
Whether the LED will handle that much current ?
Please guide us to proceed further in this analysis.
Regards
Vinoth G