NHD-2.4-240320CF-BSXV-F Backlight

adnan.ashraf

Hi,

I can see from the datasheet that there are four cathode pins for the backlight, however the LEDs are five. I am planning to use a backlight display controller which will keep the current consistent through each channel. But, I am not sure about K1 pin which has two LEDs. For example, if I chose 25 mA to pass through each cathode pin, then the two LEDs connected to K1 pin will be biased at around 12.5 mA resulting in uneven brightness. Besides, what is the typical and maximum current allowed through each LED? Is it 20 mA and 25 mA, or 25 mA and 31.25 mA?

I also read through the forum that there is a dimming control in the controller. Does this mean that controlling the brightness through a dedicated controller is not needed and all the cathode pins should be joined together and all the LEDs should be biased at 3.1 V and 100 mA?

Please suggest, how to proceed with the backlight control.

Thanks!

Adnan

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1 comment

Date Votes
  • Engineering Support
    Community moderator
    • Edited

    Hi Adnan,

     

    All the backlight LEDs are shorted internally. You would need to provide power to the backlight pin 20.

    The input power to this pin would have to the range listed in electrical characteristics table.

    Unfortunately, the backlight is not controlled by the IC.

     

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