I wanted to make a 7x10 led dot matrix using two 5x7 led dot matrix from lite-on (LTP757KR). I first thought of using shift registers, then I found a 12 x 8 dot matrix led driver with a bunch of additional functions. I checked the datasheet for schematics on how to use the driver and found that the leds are connected without a resistor on them.
It got me thinking how the voltage on the leds were controlled. The datasheet specifies how the current per led can be controlled by PWM register value and the GCC(global current control) Value.
Does this mean that I can control the leds with only the current, not caring about the voltage? How does the driver know what voltage V the led would be at some amount of current I? Or am I doing something wrong?