Identifying pixel errors

Screens are essential components in digital cameras. The technology has been in use since the earliest days of digital photography, although these days the organic light-emitting diode (OLED) screen has largely replaced the liquid crystal display (LCD) in camera electronic viewfinders (EVFs).

Both display screens and digital camera image sensors have one thing in common: they are arrays containing millions of photodiodes arranged in a grid. These photodiodes produce the picture elements (pixels) that make up the image you see on the screen or, in the case of the sensor output, the data that is recorded as an image file.

When everything is working properly, the average photographer gives little thought to those pixel arrays. But