Display device and manufacturing method of the same
View Patent ↗Conventionally, when a protective/insulation film is present above a film to be corrected, only a defect of the film to be corrected below such an upper-layer film is corrected without damaging the upper-layer film. A display region of a display device has an insulation film, a semiconductor film and a conductive film formed in a given pattern and stacked on a substrate. When at least one of a correction portion out of a correction portion which separates a short-circuit defect, a correction portion which connects an opening defect, a correction portion which removes a standard deviation defect, and a correction portion which separates a standard deviation defect of the pattern is corrected, at least one upper-layer film is present above a film to be corrected at the correction portion and the correction is applied to the film to be corrected while leaving the upper-layer film intact.
1. A manufacturing method of a display device comprising:
a film forming step in which a plurality of films including an insulation film, a semiconductor film and a conductive film are stacked onto a substrate; and
a defect portion correcting step in which at least one correction out of a short-circuit defect portion separation correction which separates a short-circuit defect, an open defect portion connection correction which performs a connection of an open defect, a standard deviation defect portion removal correction which performs a removal of a standard deviation defect, and a standard deviation defect portion separation correction which performs a separation of a standard deviation defect portion generated in the formed film is performed, wherein
at a point of correction time of the defect portion correction step, at least one upper-layer film is present above a film to be corrected at the correction portion and the correction is applied to the film to be corrected while leaving the upper-layer film as it is,
the correction is performed by irradiating laser beams,
an output of the laser beams is set to 0.02 W/cm 2 or less,
the laser beams are irradiated from above the substrate through the upper-layer film to the correction portion, and
a wavelength of the laser beams is set to a wavelength that allows the laser beams to be more easily absorbed in the film to be corrected than in the upper-layer film.
2. A manufacturing method of a display device according to claim 1 , wherein the laser beams are irradiated to the same portion by dividing the laser beams plural times.
3. A manufacturing method of a display device according to claim 2 , wherein the laser beams are irradiated to the same portion by dividing the laser beams at least 10 times.
4. A manufacturing method of a display device according to claim 2 , wherein an irradiation interval of the laser beams is equal to or more than 0.3 seconds.
5. A manufacturing method of a display device according to claim 1 , wherein when the film to be corrected is an amorphous silicon semiconductor film, a wavelength of the laser beams is set to 250 nm to 360 nm.
6. A manufacturing method of a display device according to claim 1 , wherein the laser beams to be irradiated to the same portion are irradiated by dividing the laser beams 10 or more times.
7. A manufacturing method of a display device according to claim 1 , wherein the upper-layer film includes at least either one of an insulation film and a transparent conductive film.
8. A manufacturing method of a display device according to claim 1 , wherein the semiconductor film is an amorphous semiconductor film and the amorphous semiconductor film is subjected to the separation correction or the removal correction.
9. A manufacturing method of a display device according to claim 1 , wherein an activated layer of a thin film transistor which has a source electrode and a drain electrode is constituted by the semiconductor film, the semiconductor film includes an intrinsic semiconductor film and a contact film formed over the intrinsic semiconductor film, wherein the separation correction of a defect which short-circuits the source electrode and the drain electrode through the contact film is performed by removing the contact film present between the source electrode and the drain electrode together with a portion of the intrinsic semiconductor film.
10. A manufacturing method of a display device according to claim 1 , wherein the conductive film is at least one of a scanning signal line, a video signal line and a pixel electrode, and the separation correction is at least one of corrections of a short-circuit defect between the scanning signal lines, a short-circuit defect between the video signal lines and a short-circuit defect between the pixel electrodes.
11. A manufacturing method of a display device according to claim 10 , wherein the pixel electrode is a transparent conductive film.
12. A manufacturing method of a display device according to claim 1 , wherein a normal display is performed by the correction.