We applied common cathode for low pixel pitch LED car display. How about applied common cathode technology for the most popular model like 5mm,6mm,8mm and 10mm? What would be the benefits then ?
What is common cathode LED car display ?
The LED chipset has two terminals, an anode and a cathode, and each full color LEDs consists of three LED chipset. (red, green and blue).
In traditional Common Anode designs, the terminals of all 3 (red, green & blue) LEDs are wired together and an external ballast resistor is added in series with the red LED to maintain a constant voltage and equalize the voltage drop across all three LEDs. This subsequently reduces available space for the LEDs making fine pixel pitch harder to achieve, while it is also an additional heat source and accelerates the aging process and reduces the lifetime.
In Common Cathode technology, separate, dedicated power supply voltages are supplied to the red, green and blue LEDs enabling the power supplied to the red LED to be controlled separately and eliminating the requirement for a ballast resistor.
This article comes from leddisplay edit released