Can we PWM an LED backlight on LCD module

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  1. - 13th August 2024, 02:29 #13
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    Default Re: Can we PWM an LED backlight on LCD module

    LCD model 2004A V1.3

    White text on blue background

    Contrast:

    - 2N2222A NPN with 1K on base
    - 0.20mA with PWM @ 1953 frequency (recommended)
    - 0.46mA with PWM @ 1953 frequency (maximum with 5K pot)


    Backlight:

    - 34mA direct 5V

    - 2N2907 PNP with 1K on base
    - 5mA with PWM @ 1953 frequency (recommended for night)
    - 15mA with PWM @ 1953 frequency (recommended for day)
    - 34mA with PWM @ 1953 frequency (maximum)


    CURRENT ON BASE:

    Contrast:

    - 1.5mA with PWM @ 1953 frequency (recommended)
    - 3.8mA with PWM @ 1953 frequency (maximum)


    Backlight:

    - 0.5mA with PWM @ 1953 frequency (recommended)
    - 4.0mA with PWM @ 1953 frequency (maximum)
    Last edited by Demon; - 13th August 2024 at 02:39.
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