Can the LED backlight on a LCD be dimmable?

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designs
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Joined: Tue Feb 20, 2018 11:06 pm

Can the LED backlight on a LCD be dimmable?

Post by designs » Tue Mar 06, 2018 11:11 pm

Is it possible to adjust the brightness of a LED backlight on a LCD module?

LCD_Designs
Posts: 258
Joined: Thu Feb 22, 2018 9:49 pm

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

Post by LCD_Designs » Thu Mar 08, 2018 8:40 pm

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
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Joined: Thu Mar 22, 2018 4:26 pm

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

Post by BobsID » Thu Mar 22, 2018 5:20 pm

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
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Joined: Thu Jun 14, 2018 8:52 pm

Can the LED backlight on a LCD be dimmable

Post by MichaelErymn » Sat Jun 23, 2018 10:56 pm

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 » Sat Jul 14, 2018 7:11 am

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

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