DLP391TPFSB datasheet(30/46 Pages) TI2

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

(continued)

SCALE VALUE

LANDED DUTY

CYCLE

GREEN

BLUE

RED

100%

30/70

12%

6/94

35%

7/93

60%

18/82

100%

70/30

100%

50/50

100%

80/20

12%

35%

13/87

35%

60%

25/75

12%

60%

24/76

100%

100/0

The last factor to account for in estimating the landed duty cycle is any applied image processing. Within the

controller, the gamma function affects the landed duty cycle.

Gamma is a power function of the form Output_Level = A × Input_LevelGamma, where A is a scaling factor that is

typically set to 1.

In the controller, gamma is applied to the incoming image data on a pixel-by-pixel basis. A typical gamma factor

is 2.2, which transforms the incoming data as shown in Figure 6-4.

Input Level (%)

100

D002

Gamma = 2.2

Figure 6-4. Example of Gamma = 2.2

From Figure 6-4, if the grayscale value of a given input pixel is 40% (before gamma is applied), then the

grayscale value will be 13% after gamma is applied. Therefore, it can be seen that since gamma has a direct

impact on the displayed grayscale level of a pixel, it also has a direct impact on the landed duty cycle of a pixel.

Consideration must also be given to any image processing that occurs before the controller.

DLP391TP

DLPS289A – JUNE 2025 – REVISED SEPTEMBER 2025

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