==== Resistor in end line for vertical sgement ====
if the segment is alone, the end line resistance resistor is of :
<math>R_{1Seg} = \frac{Vcc - U_{seg}}{I_{LED}} = \frac{12V - 10V}{20mA}</math>
= '''100 Ω'''
Power dissipated by the resistor Rseg: <math>\fracP_{1R_{1Seg}} = R_{21Seg}\cdot I_{Led}^2 = 100 \cdot (20mA)^2 </math>= '''40 mW'''
= Layout =