Method and system for evaluating polysilicon, and method and system for fabricating thin film transistor
First Claim
Patent Images
1. A polysilicon evaluating method of evaluating a polysilicon film formed by annealing an amorphous silicon film, comprising the steps of:
- picking up an image of a surface of the polysilicon film;
dividing the picked-up image into a plurality of regions and calculating a contrast in each of the regions divided from the picked-up image;
detecting a high contrast region and a low contrast region and comparing the contrasts in the high contrast and low contrast regions with each other; and
evaluating a state of the polysilicon film on the basis of the comparison result.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of evaluating a state of a polysilicon film objectively, accurately, automatically, and in a non-contact manner is provided. The method includes the steps of picking up a surface of a polysilicon film formed by excimer laser annealing, dividing the picked-up image into meshes each having a specific size, calculating a contrast in each of the meshes, extracting a highest contrast value and a lowest contrast value in the picked-up image, calculating a contrast ratio therebetween, and judging an average grain size of the polysilicon film on the basis of the contrast ratio.
24 Citations
24 Claims
-
1. A polysilicon evaluating method of evaluating a polysilicon film formed by annealing an amorphous silicon film, comprising the steps of:
-
picking up an image of a surface of the polysilicon film;
dividing the picked-up image into a plurality of regions and calculating a contrast in each of the regions divided from the picked-up image;
detecting a high contrast region and a low contrast region and comparing the contrasts in the high contrast and low contrast regions with each other; and
evaluating a state of the polysilicon film on the basis of the comparison result. - View Dependent Claims (2, 3, 4, 5)
the state of the polysilicon film is evaluated on the basis of the contrast ratio.
-
-
3. A polysilicon evaluating method according to claim 1, wherein a polysilicon film, which is formed by subjecting an amorphous silicon film to laser annealing, is evaluated.
-
4. A polysilicon evaluating method according to claim 3, wherein a polysilicon film, which is formed by subjecting an amorphous silicon film to laser annealing using a linear laser beam with which a linear portion of the amorphous silicon film is irradiated, is evaluated.
-
5. A polysilicon evaluating method according to claim 4, wherein a polysilicon film, which is formed by subjecting an amorphous silicon film to excimer laser annealing, is evaluated.
-
6. A polysilicon evaluating system for evaluating a polysilicon film formed by annealing an amorphous silicon film, comprising:
-
pick-up means of picking up an image of a surface of the polysilicon film; and
evaluation means of dividing the picked-up image into a plurality of regions, calculating a contrast in each of the regions divided from the picked-up image, detecting a high contrast region and a low contrast region, comparing the contrasts in the high contrast and low contrast regions with each other, and evaluating the state of the polysilicon film on the basis of the comparison result. - View Dependent Claims (7, 8, 9, 10)
-
-
11. A thin film transistor fabricating method of fabricating a thin film transistor, comprising:
-
amorphous silicon forming step of forming an amorphous silicon film;
polysilicon film forming step of forming a polysilicon film by annealing the amorphous silicon film; and
evaluating step of picking up an image of a surface of the polysilicon film, dividing the picked-up image into a plurality of regions, calculating a contrast in each of the regions divided from the picked-up image, detecting a high contrast region and a low contrast region, comparing the contrasts in the high contrast and low contrast regions, and evaluating the state of the polysilicon film on the basis of the comparison result. - View Dependent Claims (12, 13, 14, 15, 16, 17)
-
-
18. A thin film transistor fabricating system for fabricating a thin film transistor, comprising:
-
an amorphous silicon forming device for forming an amorphous silicon film;
a polysilicon film forming device for forming a polysilicon film by annealing the amorphous silicon film; and
an evaluating device for picking up an image of a surface of the polysilicon film, dividing the picked-up image into a plurality of regions, calculating a contrast in each of the regions divided from the picked-up image, detecting a high contrast region and a low contrast region, comparing the contrasts in the high contrast and low contrast regions, and evaluating the state of the polysilicon film on the basis of the comparison result. - View Dependent Claims (19, 20, 21, 22, 23, 24)
-
Specification