During a given period of time, the Landed Duty Cycle of a given pixel follows from the input image content being displayed by that specific pixel regardless if the illumination is turned on or off.

For example, in the simplest case, when displaying pure-white on a given pixel for a given time period, that pixel experiences a 100/0 Landed Duty Cycle during that time period. Likewise, when displaying pure-black, the pixel experiences a 0/100 Landed Duty Cycle.

If the use case involves inputting grayscale (8-bit) input images, between the two extremes (ignoring for the moment color and any image processing that may be applied to an incoming image), the Landed Duty Cycle tracks one-to-one with the grayscale value, as shown in Table 7-1.

Accounting for color rendition (but still ignoring image processing) requires knowing both the color intensity (from 0% to 100%) for each constituent primary color (red, green, and blue) for the given pixel as well as the color cycle time for each primary color, where “color cycle time” is the total percentage of the frame time that a given primary must be displayed in order to achieve the desired white point.

During a given period of time, the landed duty cycle of a given pixel can be calculated as follows:

• Landed Duty Cycle = (Red_Cycle_% × Red_Scale_Value) + (Green_Cycle_% × Green_Scale_Value) + (Blue_Cycle_% × Blue_Scale_Value)

Where

• Red_Cycle_%, Green_Cycle_%, and Blue_Cycle_%, represent the percentage of the frame time that Red, Green, and Blue are displayed (respectively) to achieve the desired white point. (1)

For example, assume that the red, green, and blue color cycle times are 50%, 20%, and 30% respectively (in order to achieve the desired white point), then the Landed Duty Cycle for various combinations of red, green, blue color intensities are as shown in Table 7-2 and Table 7-3.