One of my earlier project ideas is now becoming very possible. I recall writing about my wish to design an LED backlight for one of my older laptop computers. The idea is the same, but the platform has changed. I will be targeting one of my Toshiba Portege 3490CT units for the upgrade.
The backlights I have are salvaged from LCD displays I recovered from the scrap box at the plant where I work. Since LCDs are basically worthless for recycling, rescuing them like this was a no-brainer.
I've measured the widths of the LCD panel and the backlight boards to find that five boards will fit if I trim the far edge of the backlight board to eliminate blank space. Also, the slim nature of the LEDs allows for the boards to be stacked with the LED sides placed together. With three LEDs on each board, this adds up to fifteen or thirty LEDs lighting up the panel. What I don't know is how bright each LED is. If I knew that, I could figure out what duty cycle I will need to drive the light bar with to get the same brightness as the original CCFL backlight.
After this operation, I will need to figure out the logic of the inverter control signals so I can design drive circuitry for the array.
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