A driving voltage control method and apparatus, an array substrate, and a display device, wherein a plurality of predetermined areas (11a) are preset within a display area (11), and corresponding to any of the predetermined areas, the apparatus comprises an acquisition module (21) configured to acquire a luminance value of a pixel cell with the maximum luminance within the predetermined area (11a) in any frame, a search module (22) configured to search a preset table for a corresponding driving voltage value according to the luminance value acquired by the acquisition module and a control module (23) configured to control a driving voltage outputted to all the pixel cells within the predetermined area (11a) in a next frame according to the driving voltage value obtained by the search module. The driving voltage for the display device in any image can be reduced without affecting the display effect of the image.