Backlight for NHD-C0220BIZ-FSW-FBW-3V3M

eric steimle

• November 28, 2022 18:33

I'm confused about how to do the backlight for this display (I did read the datasheet and search the forum). I get that it wants 30mA but what's on the other side?  A single LED, a series of LEDs, or a just a resistor like I saw in the previous post?

I'm going for an always own backlight so if it's just a resistor I'd guess I need about 3.3V ->10 Ohms->A, and then K to GND for full brightness?

Thank you

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  Engineering Support

  Community moderator

  • November 29, 2022 18:00

  Hi Eric,

  This is the backlight circuit, it has 2 LEDs.

  

  The LED of the backlight is driven by current drain; drive voltage is for reference only. Drive voltage must be selected to ensure backlight current drain does not exceed 35mA as stated on our spec. The circuit does not have a resistor. If you want full brightness, then you have maximize the current to 35mA (K goes to GND).

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  eric steimle

  • November 29, 2022 18:04

  Can you share the datasheet of those LEDs or at least the Vfw at 30mA so I can pick a resistor or other circuit here?

  Thank you.  

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  Engineering Support

  Community moderator

  • November 30, 2022 22:46

  Hi Eric,

  This was answered via email.

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