![Why exactly does the point where this tangent line cuts the x-axis gives us the threshold voltage? Isn't the threshold voltage the minimum voltage needed to light up the LED? Why do Why exactly does the point where this tangent line cuts the x-axis gives us the threshold voltage? Isn't the threshold voltage the minimum voltage needed to light up the LED? Why do](https://i.redd.it/9fvt4nvp2uh81.jpg)
Why exactly does the point where this tangent line cuts the x-axis gives us the threshold voltage? Isn't the threshold voltage the minimum voltage needed to light up the LED? Why do
![First LED driver to control total power dissipation in a lighting system and to eliminate the need for an external microcontroller or switch-mode converter — LED professional - LED Lighting Technology, Application First LED driver to control total power dissipation in a lighting system and to eliminate the need for an external microcontroller or switch-mode converter — LED professional - LED Lighting Technology, Application](https://www.led-professional.com/products/led-driver-ics-modules/first-led-driver-to-control-total-power-dissipation-in-a-lighting-system-and-to-eliminate-the-need-for-an-external-microcontroller-or-switch-mode-converter/@@images/7cf0c19b-bc49-4ec8-b8e6-380fa26c0b3b.png)
First LED driver to control total power dissipation in a lighting system and to eliminate the need for an external microcontroller or switch-mode converter — LED professional - LED Lighting Technology, Application
Threshold Voltage Modulation in a Transistor with a Two-Dimensional Electron Gas Channel at the Interface between Al2O3 and Sub-5 nm ZnO Films | ACS Applied Electronic Materials
![visible light - Is there any relation between turn on voltage of LED and the colour emitted? - Physics Stack Exchange visible light - Is there any relation between turn on voltage of LED and the colour emitted? - Physics Stack Exchange](https://i.stack.imgur.com/HJcxo.jpg)