DLP391TPFSB datasheet(29/46 Pages) TI2

29 / 46 page

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 6-1.

Table 6-1. Grayscale Value and Landed Duty Cycle

GRAYSCALE VALUE

LANDED DUTY CYCLE

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 in order to achieve the desired white point.

Use Equation 13 to calculate the landed duty cycle of a given pixel during a given time period.

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

(Blue_Cycle_% × Blue_Scale_Value)

(13)

where

• Red_Cycle_%, represents the percentage of the frame time that red is displayed to achieve the desired white

point.

• Green_Cycle_% represents the percentage of the frame time that green is displayed to achieve the desired

white point.

• Blue_Cycle_%, represents the percentage of the frame time that blue is displayed to achieve the desired

white point.

For example, assume that the red, green, and blue color cycle times are 30%, 50%, and 20%, respectively (in

order to achieve the desired white point), then the landed duty cycle for various combinations of red, green, blue

color intensities would be as shown in Table 6-2 and Table 6-3.

Table 6-2. Example Landed Duty Cycle for Full-

Color, Color Percentage

CYCLE PERCENTAGE

GREEN

BLUE

RED

50%

20%

30%

Table 6-3. Example Landed Duty Cycle for Full-Color

SCALE VALUE

LANDED DUTY

CYCLE

GREEN

BLUE

RED

0/100

100%

50/50

100%

20/80

www.ti.com

DLP391TP

DLPS289A – JUNE 2025 – REVISED SEPTEMBER 2025

Submit Document Feedback

Product Folder Links: DLP391TP

DLP391TPFSB Scheda tecnica(PDF) 29 Page - Texas Instruments

DLP391TPFSB Scheda tecnica(HTML) 29 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

Scheda tecnica Scarica

Link URL