Patent ID: 7527415

Claim:
A light guide plate applied to a backlight module, comprising: a light emitting surface; a light incident surface, adjacent to the light emitting surface; and a bottom surface, opposite to the light emitting surface and adjacent to the light incident surface, comprising: a plurality of first flat surfaces, wherein each of the first flat surfaces is at a first distance respectively from the light emitting surface, and the first distances gradually decrease along a direction away from the light incident surface; and a plurality of prism patterns, disposed alternately with the first flat surfaces, wherein each of the prism patterns has at least a groove and a first slanted surface and further comprises a fourth slanted surface located between the first slanted surface of the same prism pattern and one of the first flat surfaces, the groove has a second slanted surface and a third slanted surface, the second slanted surface is located between one of the first flat surfaces and the third slanted surface, the first slanted surface is located between the third slanted surface and another one of the first flat surfaces, the first slanted surface slants relative to the third slanted surface and the first flat surfaces, a first side of the first slanted surface adjacent to the light emitting surface is at a second distance from a second side of the first slanted surface far from the light emitting surface, a third side of the second slanted surface adjacent to the light emitting surface is at a third distance from a fourth side of the second slanted surface far from the light emitting surface, a first orthogonal projection of the second distance is formed on an axis perpendicular to the first flat surfaces, a second orthogonal projection of the third distance is formed on the axis, and the specific value of dividing the first orthogonal projection by the second orthogonal projection is greater than or equal to 0.5 and less than or equal to 1.5.