DLP4710LCFQL datasheet(30/45 Pages) TI2

30 / 45 page

Table 7-1. Grayscale

Value and Landed Duty

Cycle (continued)

Grayscale

Value

Nominal

Landed Duty

Cycle

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

To account for color rendition (and continuing to ignore image processing for this example) 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 describes 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 nominal landed duty cycle of a given pixel can be calculated as shown in

Equation 1:

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

Blue_Scale_Value)

(1)

where

• Red_Cycle_% represents the percentage of the frame time that red displays to achieve the desired white

point

• Green_Cycle_% represents the percentage of the frame time that green displays to achieve the desired white

point

• Blue_Cycle_% represents the percentage of the frame time that blue displays to achieve the desired white

point

For example, assume that the ratio of red, green and blue color cycle times are as listed in Table 7-2 (in order

to achieve the desired white point) then the resulting nominal landed duty cycle for various combinations of red,

green, blue color intensities are as shown in Table 7-3.

Table 7-2. Example Landed Duty Cycle for Full-Color

Pixels

Red Cycle

Percentage

Green Cycle

Percentage

Blue Cycle

Percentage

50%

20%

30%

Table 7-3. Color Intensity Combinations

Red Scale

Value

Green Scale

Value

Blue Scale

Value

Nominal

Landed Duty

Cycle

0/100

100%

50/50

100%

20/80

100%

30/70

DLP4710LC

DLPS178C – MAY 2020 – REVISED JULY 2023

www.ti.com

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