A direct-type backlight module and a lamp holder thereof are disclosed. More particularly, the present disclosure relates to a centerless grinding machine comprising a damping device. The rotational movement of the shaft of the motor is converted into a longitudinal movement of the valve block by means of a coupling. Further process variants may include doping the titanium oxide, pedestal heating during the ALD process to 275-300 degrees Celsius, use of platinum or ruthenium for the BEL, and plural reagent pulses of ozone for each ALD process cycle.