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DT070BTFT Dimming Backlight

Hello,

I am using DT070BTFT-HB-PTS1 and I would llike to be able to adjust the brightness of the backlight.

Would you suggest using a Led driver? The problem I face is that all leds are connected in parallel and I can only adjust the

Is an NPN transistor with a pwm pulse enough?

Thank you

Replies

engineering_seacomp's picture
engineering_seacomp
October 5, 2018

Hi,

There is a backlight voltage and current spec included on each of our display specs along with the typical Brightness. The display brightness can be controlled via the following two methods: 

  • Setting a resistor value on their board (Cannot be changed or altered)
  • Through PWM – (Controlled by IC or Transistor)

Have a look at the following circuit using the OnSemi CAT4139

https://www.screencast.com/t/SUXgZYhu8

Thanks,