JAJSFX3F august 2012 – april 2023 DLP9500
PRODUCTION DATA
During a given period of time, the landed duty cycle of a given pixel follows from the image content being displayed by that pixel.
For example, in the simplest case, when displaying pure-white on a given pixel for a given time period, that pixel will experience a 100/0 landed duty cycle during that time period. Likewise, when displaying pure-black, the pixel will experience a 0/100 landed duty cycle.
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 gray scale value, as shown in Table 7-5.
GRAYSCALE VALUE | LANDED DUTY CYCLE |
---|---|
0% | 0/100 |
10% | 10/90 |
20% | 20/80 |
30% | 30/70 |
40% | 40/60 |
50% | 50/50 |
60% | 60/40 |
70% | 70/30 |
80% | 80/20 |
90% | 90/10 |
100% | 100/0 |
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/or 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 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.
For example, assume that the red, green and blue color cycle times are 50%, 20%, and 30% respectively (to achieve the desired white point), then the landed duty for various combinations of red, green, blue color intensities would be as shown in Table 7-6.
RED CYCLE PERCENTAGE 50% | GREEN CYCLE PERCENTAGE 20% | BLUE CYCLE PERCENTAGE 30% | LANDED DUTY CYCLE |
---|---|---|---|
RED SCALE VALUE | GREEN SCALE VALUE | BLUE SCALE VALUE | |
0% | 0% | 0% | 0/100 |
100% | 0% | 0% | 50/50 |
0% | 100% | 0% | 20/80 |
0% | 0% | 100% | 30/70 |
12% | 0% | 0% | 6/94 |
0% | 35% | 0% | 7/93 |
0% | 0% | 60% | 18/82 |
100% | 100% | 0% | 70/30 |
0% | 100% | 100% | 50/50 |
100% | 0% | 100% | 80/20 |
12% | 35% | 0% | 13/87 |
0% | 35% | 60% | 25/75 |
12% | 0% | 60% | 24/76 |
100% | 100% | 100% | 100/0 |