Answer: A. Indoor and outdoor, semi-outdoor screen.
Answer analysis: When discussing how LED screens are classified according to the use environment, we need to analyze them according to the design, purpose and environmental conditions that the screen can adapt to. Now, let's examine the given options one by one:
A. Indoor and outdoor, semi-outdoor screen: This option clearly distinguishes the three use environments of LED screens. Indoor screens usually have lower brightness, lighter weight and finer pixel pitch to adapt to the characteristics of close viewing distance and dim ambient light indoors. Outdoor screens require higher brightness, stronger waterproof and dustproof capabilities and more stable installation structures to cope with complex and changeable outdoor environmental conditions. Semi-outdoor screens are between the two and may be used in some semi-open or protected environments.
B. Full color and single and double color: This option actually describes the display color type of LED screens, not the use environment. Full-color screens can display full color images and videos, while single and double color screens can only display a limited number of colors (such as red, green, yellow or a combination of them).
C. Semi-outdoor monochrome: This option attempts to combine the use environment and display color type, but this classification method is not accurate. First of all, "semi-outdoor" can be regarded as a description of the use environment, but "monochrome" belongs to the category of display color type. Therefore, this option confuses two different classification standards.
D. Full-color outdoor display: Although this option specifically describes the full-color display in the outdoor environment, it only covers the two specific conditions of full color and outdoor, and does not cover the full range of the use environment of LED display.
In summary, when classifying LED display screens according to the use environment, the most comprehensive and accurate classification method is option A: indoor and outdoor, semi-outdoor screen. This classification method takes into account the physical installation location of the display screen and also implies different requirements for the performance of the display screen in different environments.
Therefore, the correct answer is A, indoor and outdoor, semi-outdoor screen.