Patent ID: 6979112

Claim:
A light guide plate used in a backlight module for a liquid crystal display, comprising: a light input end; a light output face adjacent the light input end; an end face opposite to the light input end; a back face opposite to the light output face; two side faces; and a plurality of fine dots formed on the back face, the dots being arranged in evenly spaced columns parallel to a y-axis, which is parallel to the light input end, the dots being arranged in evenly spaced rows parallel to an x-axis, which is perpendicular to the light input end, the dots in a same column having a same size and the dots in a same row sequentially increasing in size; wherein a radius r of the dots in each row thereof varies as a function of a column number X of a given dot, in accordance with the formula: r=A+BX+CX 2 +DX 3 +EX 4 +FX 5 , wherein the column number X varies in consecutive whole numbers from a value of one for the column nearest the light input end to a maximum value for the column most distal from the light input end; and A, B, C, D, E, and F are respectively constants, and each of the constants is in the range from 1 to 9.