Display
The Lumia 640 features a 5.0-inch IPS LCD display with a resolution of 720 x 1280 pixels, which results in a pixel density of about 294 ppi. The display is protected by Corning Gorilla Glass 3, adding a layer of durability against scratches and minor impacts. Furthermore, the inclusion of ClearBlack technology enhances the contrast by improving the depth of blacks, which is particularly beneficial for outdoor visibility. The screen-to-body ratio of approximately 67.6% contributes to the device's compact form.