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Topic: Which cables to use with pwm backlight (Read 237 times) previous topic - next topic

idmaster

Hello,

I am making a portable laptop.
I am using a display that can connect to hdmi and various other devices.

I have everything working, but the back-light brightness is very bright.

The display does have options to set the brightness and contrast etc. But if i change this
this seems to only affect the colors and not the back-light it self.

Because i want to spare battery and be able to custom change the back-light. I looked for a way to modify this.

I have figured , when removing the cables shown in this picture :

http://apartment-san-roque.com/image-share/backlight.jpg

The display turns off. When i put a flashlight behind the LCD i can clearly see the colors and images on the screen. So these cables should only affect the back-light it self.

What i want is to put a PWM between these cables to control this display's brightness from the back-light.

My problem is that i have no experience with hardware in any way. So i have no clue which cables i should attach to the PWM, nor do i know what these cables/colors mean.

I think that the cables are default for a back-light. But i have to find an pro that knows what these cables mean.

Does someone here known which cables to use and what kind of voltage etc the PWM should be ?

There is a manual for the display which shows some information about it. I could not find which cables i need, but maybe i am reading it wrong.

This manual can be found here :

http://m5.img.dxcdn.com/CDDriver/CD/sku.275804.pdf

The display :

http://www.dx.com/p/10-1-digital-ips-screen-1280-x-800-drive-board-for-raspberry-pcduino-cubieboard-black-275804

I really appreciate help !!!





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