Device mounting substrate and method of repairing defective device

A method of producing an image display unit including light emitting devices arrayed on a substrate in a matrix and being electrically connected to wiring lines, each of the light emitting devices forming a pixel, the method comprising the steps of:

• transferring the light emitting devices from a first substrate to a temporary holding member such that the light emitting devices transferred on the temporary holding member are enlargedly spaced from each other with a pitch larger than a pitch of the light emitting devices arrayed on the first substrate, and holding the light emitting devices on the temporary holding member;
• transferring the light emitting devices held on the temporary holding member to a second substrate such that the light emitting devices transferred on the second substrate are more enlargedly spaced from each other with a pitch larger than the pitch of the light emitting devices held on the temporary holding member;
• electrically connecting the devices, which have been arrayed on the second substrate so as to be spaced from each other, to wiring lines connected to a drive circuit;
• detecting a defective device;
• and
• mounting a light emitting device for repair at a position corresponding to a position of the defective light emitting device.