The selection of LED display screen does need to be determined based on its environment and the distance between the observation position and the display screen. The following is a detailed interpretation and supplement of the information you have provided:

1、 The environment in which the display screen is located

Outdoor environment:
Outdoor display screens need to withstand various harsh weather conditions, such as rain, direct sunlight, high and low temperatures, etc.
The waterproof level requirement is high, generally above IP65, to ensure that the display screen can work normally even in rainy weather.
The brightness of the display screen needs to be considered, as outdoor lighting is strong and the brightness of the display screen needs to be high enough to be clearly visible.
Outdoor display screens usually choose full-color displays to provide rich colors and visual effects.
Semi outdoor environment:
A semi outdoor environment falls between indoor and outdoor environments, such as shaded areas or outdoor spaces with certain obstructions.
The waterproof level requirement is slightly lower than outdoor, but it still needs to have a certain degree of waterproof performance.
The brightness requirement is also lower than outdoor display screens, but still needs to be higher than indoor display screens.
Indoor environment:
Indoor display screens are mainly affected by environmental factors such as indoor lighting and temperature.
The waterproof level requirement is relatively low because the indoor environment is relatively dry.
Moderate brightness is required because indoor lighting is relatively weak.

2、 The distance between the observation position and the display screen position

Visual distance:
The visual distance determines the model and resolution of the display screen. The farther the distance, the lower the required resolution, as the human eye cannot distinguish excessively high resolutions at long distances.
In regular models, the number after P represents the distance between the light beads (in millimeters), which is roughly equivalent to the minimum visible distance.
Scientific calculation methods:
Calculate the visible distance using the density of light beads per square meter. This method is more accurate and can calculate the optimal observation distance based on the dot density of the display screen.
The calculation formula is: distance=1400/(square root of point density). For example, if the point density of P10 is 10000 points per square meter, the observation distance is 14 meters.

3、 Purchase suggestions

Clarify the environment and requirements:
Before making a purchase, it is necessary to first clarify the environment and specific requirements of the display screen, such as whether it needs waterproofing, brightness requirements, resolution requirements, etc.
Choose the appropriate model:
Select the appropriate display screen model and resolution based on visual distance and environmental requirements.
Consider cost-effectiveness:
On the premise of meeting basic needs, consider the cost-effectiveness of the display screen and choose products with reasonable prices and reliable quality.

Consulting professionals:

If you have any questions or uncertainties about the purchasing process, you can consult professional LED display sales or technical personnel for more accurate advice and assistance.

In summary, when choosing a full-color LED display screen, it is necessary to comprehensively consider the environment in which the display screen is located and the distance between the observation position and the display screen to ensure that the selected product matches the environment and needs.