NHD-24064WG-AYYH-V Backlight current

sergef

• May 18, 2016 03:07

I've been looking at the datasheet of the NHD-24064WG-AYYH-V display and the backlight current (660mA) seems to be very high compared with other similar displays (about 100mA).

I want to use a voltage regulator to supply 4.2V but I can't find one who can handle 660mA that needs the display.

It's correct the data of 660mA shown at the NHD-24064WG-AYYH-V datasheet?

If yes, It's possible to connect the backlight display directly to a 5V Power supply?

Sorry for my poor english. I hope you can understand my doubt.

Thanks in advance for your help.

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  Saurabh_B

  • May 18, 2016 08:07

  Hi,
  
  If you were to use a current limiting resistor in series with the backlight pins you can apply 5V directly to the backlight.
  I would recommend using a ~1.2Ω resistor for this.

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  sergef

  • May 19, 2016 08:07

  I guess you want to say 1K2 ohm resistor (brown - red - red - gold/silver)
  
  I'll try it if you confirm me that issue.
  
  Thank you very much for your answer.

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  Saurabh_B

  • May 19, 2016 09:07

  No, you would want to use a 1.2Ω resistor. A 1.2KΩ resistor would result in a very dim backlight.
  For a current limiting resistor you would want to do the following = (Vin - VLED)/(ILED)
  (5-4.2)V
  0.660 A
  
  Which would leave you with ~1.21Ω

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  sergef

  • May 19, 2016 11:07

  OMG!!! Basic Ohm's Law    
  
  How I didn't think it before? I feel like a fool  
  
  Thank you very very much  

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