Patent ID: 7537865

Claim:
A method of adjusting the size of a contact window photomask pattern of a photomask, comprising: providing a first contact window pattern comprising four corner coordinates including (x 1 , y 1 ), (x 2 , y 1 ), (x 1 , y 2 ) and (x 2 , y 2 ) respectively, the first contact window pattern having a first length L and a first width W, wherein the first length L is a difference between y 2 and y 1 , and the first width W is a difference between x 2 and x 1 ; and adjusting a size of the first contact window pattern, wherein the adjusted size of the first contact window pattern is A, wherein the step of adjusting the size of the first contact window pattern comprises: multiplying x 1 , x 2 , y 1 , and y 2 by A respectively and rounding off all decimal places to obtain x 1 ′, x 2 ′, y 1 ′, y 2 ′, and a second contact window pattern comprising four corner coordinates including (x 1 ′, y 1 ′), (x 2 ′, y 1 ′), (x 1 ′, y 2 ′) and (x 2 ′, y 2 ′), and having a second length L′ and a second width W′, wherein the second length L′ is a difference between y 2 ′ and y 1 ′, and the second width is a difference between x 2 ′ and x 1 ′; multiplying the first length L and the first width W by A respectively and rounding off all decimal places to obtain a third length L″ and a third width W″; and adjusting the second length L′ and the second width W′ based on the third length L″ and the third width W″.