A method of power control of a display system, wherein the display system contains an OLED display having a plurality of emitters, or contains a liquid crystal having a subset of individual emitters for the backlight, the method comprising: receiving, prior to display of a beginning of a first scene of video signal/input image data, wherein a scene is defined as a sequence of consecutive image frames, a first dynamic metadata corresponding to all input image data from the first scene, the first dynamic metadata being transmitted with the video signal/input image data and the first metadata comprising: the duration of the first scene expressed as the number of consecutive image frames, the identification of the frames constituting the first scene, and the peak image brightness of the first scene, wherein the method is characterized by: determining, at the beginning of the first scene, the peak panel load level of the first scene, for the complete first scene, of the display system based on the first dynamic metadata; precomputing a first net power control function for the first scene, based on the peak panel load level of the first scene plus a buffer value, such that a global gain value of the display system using the first NPC function is selected such that a first constant NPC level of the first NPC function is chosen to reduce the total system load compared to the original image by using the global gain; and applying the first NPC function having the first constant level to the display system during the first scene based on the peak panel load level of the first scene, wherein the first NPC function is applied for all image frames of the first scene during an entirety of the first scene, wherein the net power control function determines the global gain as a function of total emitter load. receiving, prior to display of a beginning of a first scene of video signal/input image data, wherein a scene is defined as a sequence of consecutive image frames, a first dynamic metadata corresponding to all input image data from the first scene, the first dynamic metadata being transmitted with the video signal/input image data and the first metadata comprising: the duration of the first scene expressed as the number of consecutive image frames, the identification of the frames constituting the first scene, and the peak image brightness of the first scene, wherein the method is characterized by: determining, at the beginning of the first scene, the peak panel load level of the first scene, for the complete first scene, of the display system based on the first dynamic metadata; precomputing a first net power control function for the first scene, based on the peak panel load level of the first scene plus a buffer value, such that a global gain value of the display system using the first NPC function is selected such that a first constant NPC level of the first NPC function is chosen to reduce the total system load compared to the original image by using the global gain; and applying the first NPC function having the first constant level to the display system during the first scene based on the peak panel load level of the first scene, wherein the first NPC function is applied for all image frames of the first scene during an entirety of the first scene, wherein the net power control function determines the global gain as a function of total emitter load. determining, at the beginning of the first scene, the peak panel load level of the first scene, for the complete first scene, of the display system based on the first dynamic metadata; precomputing a first net power control function for the first scene, based on the peak panel load level of the first scene plus a buffer value, such that a global gain value of the display system using the first NPC function is selected such that a first constant NPC level of the first NPC function is chosen to reduce the total system load compared to the original image by using the global gain; and applying the first NPC function having the first constant level to the display system during the first scene based on the peak panel load level of the first scene, wherein the first NPC function is applied for all image frames of the first scene during an entirety of the first scene, wherein the net power control function determines the global gain as a function of total emitter load.