1. A direct type backlight unit disposed under a liquid crystal panel, comprising:a backlight module comprising:
a printed circuit board comprising blocks arranged in an M×N matrix, M and N being natural numbers of 2 or greater;
light emitting devices disposed on the printed circuit board such that at least one light emitting device is disposed in each of the blocks, each of the light emitting devices comprising light emitting cells disposed on a single substrate; and
optical members disposed on the light emitting devices, each of the optical members being configured to change a light beam distribution of a corresponding light emitting device; and
a backlight control module configured to control dimming levels of the light emitting devices and to independently control the light emitting devices disposed in different blocks,
wherein the light emitting devices in the blocks are not electrically connected to each other in series or in parallel.