Led illuminating device with prism sheet

An LED illuminating device comprising:

• a housing comprising a base plate;
• a prism sheet mounted in the housing and comprising a plurality of V-shaped micro-grooves formed thereon along at least two directions intersecting with each other;
• and
• a circuit board fixed on the base plate, wherein a plurality of LED illuminating arrays are arranged on the circuit board to form a matrix, each LED illuminating array comprises two LED units, at least four virtual light sources are formed by reflection of the prism sheet to the circuit board after the light is emitted by a particular LED unit on circuit board;
• the rows of the matrix are spaced apart a first preset distance, and the columns of the matrix are spaced apart a second preset distance, and each two LED units in one LED illuminating array are spaced apart a third preset distance.