Answer: B. 2880Hz.
Answer analysis: When discussing the refresh rate of LED displays, we need to understand that the refresh rate refers to the number of times the screen updates the picture per second. This indicator has an important impact on the display effect of the display, especially on the performance of dynamic pictures. Now, let's analyze the given options one by one:
A. 1920Hz: Although a refresh rate of 1920Hz may exist on certain types of displays, this refresh rate is not particularly common in common LED displays. The refresh rate of LED displays is usually higher than this value to provide better dynamic picture display effects.
B. 2880Hz: This refresh rate is more common in LED displays. It provides a high enough picture update speed to ensure smooth and smooth pictures when displaying dynamic content.
C. 3840Hz: Although LED displays can technically achieve this or higher refresh rates, 3840Hz is not one of the most common or standard refresh rates on the market. However, such a high refresh rate may be used in high-end applications that pursue extreme display effects.
D. 9600Hz: This refresh rate is much higher than the standard of general LED display. Although technically feasible, in practical applications, such a high refresh rate is not common due to factors such as cost, power consumption, and the need to display content. It may appear more in specific fields or experimental products.
In summary, considering the commonality and practicality of refresh rates, 2880Hz is a more common refresh rate in LED displays. Of course, different application scenarios and needs may choose different refresh rates, but 2880Hz is undoubtedly one of the widely accepted and used standards.
Therefore, the correct answer is B: 2880Hz.