Patent ID: 8881671

Claim:
A rubbing system for an alignment of a liquid crystal display device, comprising: a rubbing table on which a substrate having an alignment layer thereon is positioned; a rubbing roll on which a rubbing material is wound, substantially positioned on the rubbing table to substantially contact said alignment layer, for rubbing said alignment layer by rotation of said rubbing roll; a first motor driven by a rubbing roll driving unit for rotating the rubbing roll; a second motor driven by the rubbing roll driving unit for lifting and lowering the rubbing roll; and a third motor driven by a rubbing table driving unit for lifting and lowering the rubbing table; and a controlling unit configured to calculate a uniform rubbing intensity applied to the alignment layer based on information relating to a liquid crystal panel and to control said alignment layer to be rubbed by substantially contacting said rubbing roll with said alignment layer by lifting and lowering said rubbing table and said rubbing roll according to the calculated uniform rubbing intensity and a critical rubbing intensity value, wherein the rubbing table driving unit drives the third motor to lift the rubbing table and a vertical position of the rubbing roll is fixed when the uniform rubbing intensity applied to the alignment layer is larger than the critical rubbing intensity value and the rubbing roll driving unit drives the second motor to lower the rubbing roll and the vertical position of the rubbing table is fixed when the uniform rubbing intensity applied to the alignment layer is smaller than the critical rubbing intensity value.