The present invention provides a light guide plate comprising an input surface for receiving light from a light source, an output surface for emitting light, and a bottom surface opposing to the output surface, wherein at least one of the output surface and the bottom surface has a micro-pattern, the micro-pattern comprising a plurality of micro-lenses. The light guide plate further comprises micro-lens having a width w, a length l, a depth d, an orientation angle, a first base angle α1, a second base angle α2, a first entry angle β1, and a second entry angle β2 such that when depth change Δd is 0.1 μm, area change ratio, defined as ( l + Δ ⁢ ⁢ l ) · ( w + Δ ⁢ ⁢ w ) - l · w l · w , is less than or equal to 0.95% and the beginning number density of the micro-lenses is greater than or equal to 8 per mm2, Δw being width change and Δl being length change corresponding to depth change Δd.