1. An ergonomic sensor module configured for use with a display device, the sensor module comprising: an image sensing device; a processing element; and an input/output interface, wherein the processing element is configured to obtain image data from the image sensing device and analyze the image data to determine, based on predefined data defining an ergonomic use range of the display device, whether the image data indicates that a user of the display device is using the display device within the ergonomic use range, and wherein analyzing the image data to determine whether the image data indicates that the user of the display device is using the display device within the ergonomic use range comprises: determining a first image portion from the image data based at least on identifying an area proximate to a face of the user, the first image portion comprising at least the area proximate to the face of the user; analyzing the first image portion to measure intensity values across the first image portion; and determining whether a lighting condition is outside the ergonomic use range by comparing a function of the intensity values of the first image portion, but not of a second image portion, with the ergonomic use range.