Changing Touch Panel Brightness

# 100% Brightness
sudo echo 0 > /sys/class/pwm/pwmchip3/export
sudo echo 50000 > /sys/class/pwm/pwmchip3/pwm0/period
sudo echo 50000 > /sys/class/pwm/pwmchip3/pwm0/duty_cycle
sudo echo 1 > /sys/class/pwm/pwmchip3/pwm0/enable

# 50% Brightness
sudo echo 0 > /sys/class/pwm/pwmchip3/export
sudo echo 50000 > /sys/class/pwm/pwmchip3/pwm0/period
sudo echo 25000 > /sys/class/pwm/pwmchip3/pwm0/duty_cycle
sudo echo 1 > /sys/class/pwm/pwmchip3/pwm0/enable

# 10% Brightness
sudo echo 0 > /sys/class/pwm/pwmchip3/export
sudo echo 50000 > /sys/class/pwm/pwmchip3/pwm0/period
sudo echo 5000 > /sys/class/pwm/pwmchip3/pwm0/duty_cycle
sudo echo 1 > /sys/class/pwm/pwmchip3/pwm0/enable