Looking at the circuit diagram for the touch screen interface board:
there is an LED backlight that is intended for PWM (pulse width modulation) control using the LCD_BKL line (connected to PB2/PWM0 of the Allwinner A10). This is pin 36 of the LCD connector for the Olimex LIME.
My IR module was designed for use with an embedded Linux system. I chose the Olimex A10-OLinuXino-LIME as it looked powerful and a good starting point for an Internet Radio project that I wanted to do.
The goal was to make a compact IR decoder that processes the signals from a TV-remote and gives a Linux based embedded computer the codes.
Pre-built version of the module.