Film forming method and producing method for electron source substrate
In case of forming films in plural positions with an ink jet head having plural nozzles, to provide a method of efficiently correcting an aberration in the liquid droplet applying position resulting for example from a distortion of a substrate, thereby producing an electron source with a high production yield. Positions of device electrodes 2, 3 on the electron source substrate 1 are detected by fetching in advance a surface image of the substrate 1 , then a position of an electroconductive film 4 is calculated as a liquid droplet applying position, and an inclination angle θ of the ink jet head 11 is so regulated that a pitch of the nozzles 12 matches a pitch d of the obtained liquid droplet applying positions.
1. A film forming method for forming films in plural positions on a substrate by applying liquid including a film material locally to the plural liquid applying positions on the substrate from an ink jet head having plural nozzles arranged linearly at a desired interval, wherein the plural liquid applying positions are arranged in a matrix form and an average pitch of the plural liquid applying positions in one row is different from that in another row, the method comprising:
a step of detecting positional information of the plural liquid applying positions on the substrate;
a step of calculating an average pitch of the plural liquid applying positions in each row, based on the positional information detected in the detecting step;
a step of adjusting a rotation angle of the ink jet head so that a pitch of the nozzles in projection to a row direction substantially coincides with the average pitch of the plural liquid applying positions in each row, and
a step of applying liquid to the liquid applying positions by scanning the ink jet head in a column direction in combination with rotating the ink jet head about an axis normal to the substrate by the rotation angle adjusted in the adjusting step.
2. A method for producing an electron source substrate which includes plural electron-emitting devices, each having a pair of device electrodes and an electroconductive film having an electron-emitting area and extending over the device electrodes, and in which the electron-emitting devices are matrix wired:
wherein the electroconductive film is formed by a film forming method according to claim 1 .
3. A method for producing an image display apparatus comprising a substrate whereon a plurality of films are arranged, wherein said films are formed on the substrate by the forming method according to claim 1 .