1. A method of testing functionality of an image display device that comprises a matrix of image elements that are individually
energisable in a graphical display, the method comprising capturing data corresponding to first and second images of the display
provided by the device under different test conditions thereof, and utilising the image data for the first and second images
to identify a malfunction of the device,
wherein the utilising of the image data includes comparing the image data for the first and second images to derive resultant
data corresponding to the functionality of the elements individually, and
wherein the elements are configured in an array of rows and columns, and including combining the resultant data for at least
a part of an individual one of the rows or columns, and comparing the combined data with a threshold to provide an indication
of a malfunction in the device.
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