Patent ID: 7723135

Claim:
A manufacturing method of a display device for obtaining an active matrix substrate for the display device by scanning and irradiating a plurality of regions in an amorphous semiconductor film or a granular poly-crystalline semiconductor film on an insulating substrate with a laser beam shaped linearly in a scanning direction which crosses a long axis direction of said laser beam to carry out annealing to reform said amorphous semiconductor film or said granular poly-crystalline semiconductor film into a strip-shaped poly-crystalline semiconductor film on the insulating substrate extending in said scanning direction, the method comprising: moving an area detector type CCD camera or a linear array sensor stepwise in said long axis direction or a short axis direction of said laser beam to thereby detect an energy distribution of said laser beam; accumulating detected signals of said energy distribution in a direction parallel to said short axis direction of said laser beam; calculating an accumulated intensity in said long axis direction of said laser beam; dividing a calculated intensity by a square root of a width of said short axis direction of said laser beam in each position of said laser beam along said long axis direction to thereby obtain an intensity distribution; and feeding a maximum value and a minimum value of said intensity distribution in a region which controls a profile of said laser beam back to an oscillation source of said laser beam or an optical system of the display device to thereby control the profile of said laser beam.