So I have a 669GL Lilliput touch screen that uses a LED back light. I'm going to use it as a home automation/home theater computer interface.
What I am trying to figure out is how to get the back light to brighten/dim depending on the amount of light in the room. It has a manual dimming feature, but that dims through the LCD, not the backlight, and, well, it's manual.
What I am hoping to build is a simple PWM circuit small enough to fit inside the monitor's case (there should be a little room; I'll know more once it's delivered).
I'm wondering if there would be a way to use a typical 555 pwm circuit and add a photo resistor to brighten it when the room lights are on, and dim it when they're off. I got the idea from various smart phones.
I'd imagine since the back light is simply "on" when the monitor is on, the PR/PWM could simply go in-line with the ~9.4 volt DC power.
Think this is doable?
What I am trying to figure out is how to get the back light to brighten/dim depending on the amount of light in the room. It has a manual dimming feature, but that dims through the LCD, not the backlight, and, well, it's manual.
What I am hoping to build is a simple PWM circuit small enough to fit inside the monitor's case (there should be a little room; I'll know more once it's delivered).
I'm wondering if there would be a way to use a typical 555 pwm circuit and add a photo resistor to brighten it when the room lights are on, and dim it when they're off. I got the idea from various smart phones.
I'd imagine since the back light is simply "on" when the monitor is on, the PR/PWM could simply go in-line with the ~9.4 volt DC power.
Think this is doable?