PURPOSE: An apparatus and a method for forming galaxy patterns on a light guide plate using diamond are provided to improve brightness by increasing scattered reflection rate of light incident to a light guide plate. CONSTITUTION: An apparatus for forming galaxy patterns on a light guide plate comprises a feeder, a pattern former(100), and a driver(400). The pattern former comprises a pattern tool with galaxy pattern formers. The galaxy pattern formers attaches the diamond powder to the end thereof, thereby forming an irregular pattern surface on the light guide plate. The feeder transfers the light guide plate to the lower part of the pattern former. The pattern former transfers the pattern tool vertically.
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