Patent ID: 7193693
Filing Date: 2007-03-20
Classification: B23K,H01L

Abstract:
1. An apparatus for manufacturing flat panel display devices including thin film transistors formed in such a manner that a silicon film formed on an insulating substrate is irradiated with a laser beam to improve the quality of said silicon film, which comprises: laser beam intensity distribution shaping element by which the intensity distribution of said laser beam applied on said silicon film is adjusted to a desired intensity distribution; intensity distribution holding system by which the intensity distribution of the laser beam incident on said laser beam intensity distribution shaping element is kept in a predetermined intensity distribution; laser beam spatial intensity distribution detector for detecting the spatial intensity distribution of the laser beam incident on said laser beam intensity distribution shaping element; processing unit for processing an acquired spatial intensity distribution signal to extract information concerning the shape and beam diameter of the laser beam; beam diameter controller for controlling the beam diameter to a predetermined numerical value on the basis of said information acquired by said processing unit; optical axis displacement detector for detecting displacement of an optical axis of the laser beam incident on said laser beam intensity distribution shaping element; and optical axis controller by which the optical axis of the laser beam incident on said laser beam intensity distribution shaping element is controlled to a predetermined optical axis.