1. A light curtain installation method for adjusting or checking an installation state of a light curtain for detecting an operation with respect to an image plane of a display apparatus, the method comprising: determining whether or not it is possible to detect an object that comes into contact with a target region on the image plane which corresponds to a reference pixel which is a pixel at a predetermined position; and setting a drive state of the reference pixel such that the drive state of the reference pixel is different depending on a result of the determining.