DLP4710LCFQL datasheet(29/44 Pages) TI1

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Input Level (%)

100

D002

Gamma = 2.2

DLP4710LC

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DLPS178 – MAY 2020

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For example, assume that the ratio of red, green and blue color cycle times are as listed in Table 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 3.

Table 2. Example Landed Duty Cycle for Full-Color

Pixels

Red Cycle

Percentage

Green Cycle

Percentage

Blue Cycle

Percentage

50%

20%

30%

Table 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

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 20.

Figure 20. Example of Gamma = 2.2

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