Answer: D. LED display screen has the characteristics of long life and low power consumption.
When discussing the claims about LED displays, we need to consider the basic principles, characteristics, and common application scenarios of LED displays. Now, let's review each option one by one to determine which one is correct.
A. The brightness of LED displays cannot be adjusted:
- This statement is incorrect. The brightness of LED displays can be controlled by adjusting the driving current of the LED lamp. In actual applications, LED displays usually have brightness adjustment functions to adapt to different ambient light conditions, such as indoors and outdoors, daytime and nighttime.
B. LED displays can only display monochrome images:
- This statement is also inaccurate. Early LED displays may be limited by technology and can only display monochrome (such as red, green, or blue), but modern LED displays, especially full-color LED displays, are already able to display images and videos containing millions of colors, which are rich and realistic.
C. The resolution of LED displays is lower than that of LCD displays:
- This statement is not absolute. The resolution of LED displays depends on the density and layout of its pixels. Although the resolution may be relatively low on some low-end or large outdoor LED screens, modern high-resolution LED screens, especially in indoor applications or high-end outdoor advertising, can fully match or even exceed the resolution of high-end LCD screens.
D. LED screens have the characteristics of long life and low power consumption:
- This statement is correct. LED (light-emitting diode) as a semiconductor light source has a long service life, usually up to tens of thousands of hours to more than 100,000 hours. At the same time, LED has a high luminous efficiency, so when providing the same brightness, the power consumption of LED screens is usually lower than that of traditional display technologies such as LCD screens.
In summary, the correct statement about LED screens is D: LED screens have the characteristics of long life and low power consumption. This feature makes LED screens widely used in many fields such as advertising, information release, and stage performances.