DLP4710LCFQL.B datasheet(31/45 Pages) TI2

31 / 45 page

Table 7-3. Color Intensity Combinations (continued)

Red Scale

Value

Green Scale

Value

Blue Scale

Value

Nominal

Landed Duty

Cycle

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 consider when estimating the landed duty cycle is any applied image processing. In the

DLPC34xx controller family, the two functions which influence the actual landed duty cycle are Gamma and

IntelliBright™, and bitplane sequencing rules.

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 DLPC34xx controller family, 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 7-2.

Figure 7-2. Example of Gamma = 2.2

As shown in Figure 7-2, when the gray scale value of a given input pixel is 40% (before gamma is applied),

then gray scale value is 13% after gamma is applied. Because gamma has a direct impact on the displayed gray

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

The IntelliBright algorithms content adaptive illumination control (CAIC) and local area brightness boost (LABB)

also apply transform functions on the gray scale level of each pixel.

But while amount of gamma applied to every pixel (of every frame) is constant (the exponent, gamma, is

constant), CAIC and LABB are both adaptive functions that can apply a different amounts of either boost or

compression to every pixel of every frame.

Be sure to account for any image processing which occurs before the controller.

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DLP4710LC

DLPS178C – MAY 2020 – REVISED JULY 2023

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