Can the LED backlight on a LCD be dimmable?

Post Reply
designs
Posts: 32
Joined: Tue Feb 20, 2018 11:06 pm

Can the LED backlight on a LCD be dimmable?

Post by designs »

Is it possible to adjust the brightness of a LED backlight on a LCD module?
LCD_Designs
Posts: 262
Joined: Thu Feb 22, 2018 9:49 pm

Re: Can the LED backlight on a LCD be dimmable?

Post by LCD_Designs »

Yes, that is the great thing about LEDs is that they are DC (Direct Current) driven and are adjustable without any complex circuitry like what is required for a AC driven backlight such as an EL or CCFL.
BobsID
Posts: 2
Joined: Thu Mar 22, 2018 4:26 pm

Re: Can the LED backlight on a LCD be dimmable?

Post by BobsID »

Yes. A resistor inline with BL+ or BL- will give a fixed intensity; a trim pot will provide manual control; a computer with a PWM port to a transistor switch will provide program control (use a large capacitor and a resistor as a low-pass filter to avoid rapid switching of the LED.) The transistor will introduce some voltage drop, hence the maximum brightness is reduced somewhat.
MichaelErymn
Posts: 3
Joined: Thu Jun 14, 2018 8:52 pm

Can the LED backlight on a LCD be dimmable

Post by MichaelErymn »

LCD is lit by a tube light in the rear and LED is lit with light emitting diodes as the name suggests.
MichaelErymn
Posts: 3
Joined: Thu Jun 14, 2018 8:52 pm

Can the LED backlight on a LCD be dimmable

Post by MichaelErymn »

LCD is lit by a tube light in the rear and LED is lit with light emitting diodes as the name suggests.
Post Reply