Answer: C. 3.0:5.9:1.1.
Answer analysis:
In LED display screens, white balance is adjusted by adjusting the brightness ratio of red (R), green (G), and blue (B). In order to get the white color closest to natural light, the brightness ratio of these three colors needs to be accurately controlled.
First, let's look at the various ratios in the options:
A. 5:3:1: In this ratio, the brightness of red (R) is relatively high, while the brightness of blue (B) is relatively low, and white balance may not be achieved accurately.
B. 6:3:1: Similarly, the brightness of red (R) is relatively high and the brightness of blue (B) is low in this ratio, which may not be the most accurate white balance ratio.
C. 3.0:5.9:1.1: In this ratio, the brightness of green (G) is relatively high, but the brightness of red (R) and blue (B) also has an appropriate ratio, which is closer to the color ratio in natural light perceived by the human eye. In LED displays, green LEDs usually have higher luminous efficiency, so it is reasonable for green to be slightly brighter.
D. 3:6:1: The brightness of green (G) in this ratio is too high, while the brightness of blue (B) is still low, which may not be the most accurate white balance.
To verify this, we can refer to some professional color management knowledge or calibration standards for LED displays. In actual applications, in order to obtain the best white balance effect, fine-tuning is usually performed according to the specific characteristics of the LED display and the use environment. But generally speaking, the brightness of green (G) will be slightly higher than red (R) and blue (B), because green LEDs have higher luminous efficiency and green occupies an important position in human vision.
In summary, the 3.0:5.9:1.1 ratio in option C is closest to the accurate ratio of white balance of LED displays in actual applications.
So the answer is: C. 3.0:5.9:1.1.