“On the control panel, if a large number (0-100 or above) of LEDs are required for instruction, the LEDs and the circuit will occupy too much space of the PCB. How to solve this problem ?”
The IJ SmartOverlay Matrix solutions will help solve this problem. By utilizing the matrix circuit design, a large number of LEDs can be trans- ferred from the PCB to the SmartOverlay, reducing the amount of space needed.