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Brightness control for HDSP 2133 dot matrix displays

Discussion in 'General Electronics Discussion' started by Naveed ishtiaq, Jan 21, 2017.

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  1. Naveed ishtiaq

    Naveed ishtiaq

    Jan 21, 2017
    I need technical help regarding the Brightness control for these displays . I don't want to use internal brightness levels (8 levels) that is its built in feature.

    I want to change the brightness levels using 10 KOhm Variable Resistor with PWM (Pulse width Modulation) technique to have a smooth effect of brightness changing levels.

    I am not interested in Night Vision circuitry that is recommended circuit of PWM for Night vision applicability by Avago Technologies and is written in Application Note 1039.

    I need intensity control for HDSP 2133 Alpha numeric dot matrix displays so that it can change Brightness levels 0% to 100% smoothly with sunlight readability. Earlier I tried with PWM (modified night vision circuit recommend by application note 1039 by avago technology) but couldnot 100% duty cycle.

    The attached circuit highlighted in red is the one that I have modified for sunlight readiblity

    May be some one can guide me some good techniques to do so.

    Your urgent technical solution will highly be appreciated.

    Attached Files:

    Last edited by a moderator: Jan 21, 2017
  2. davenn

    davenn Moderator

    Sep 5, 2009
    Your urgent supply of more technical information of this product will highly be appreciated.
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