sentence: Most display screens have hundreds of thousands of pixels.
sentences_after: To make a clear picture, the screen might need to make millions of calculations. Any group of pixels that change to the same colour can be changed with one calculation, making the calculations much smaller. For example, if the picture to display was just a white screen, the screens processor would only calculate the colour once and use the same calculation for the whole screen. Changing one pixel at a time would take many more calculations. If the same picture was shown many times on the screen, the processor would calculate the picture once and then repeat it in whatever position and in different sizes, if needed.
concept_name: display screen
headings: Thin film transistor liquid crystal display Resolution Rendering
categories: Display technology Television technology Computer science Electronics