In the product name "P3.9/7.8 transparent glass window wall LED screen," the values "3.9" and "7.8" represent the pixel pitch of the LED screen, but they specify different values for the horizontal and vertical distances between the individual lamp beads (LED pixels).

1. P3.9 Pixel Pitch: The value "3.9" refers to the horizontal distance between the centers of two adjacent lamp beads (pixels) on the LED screen. In this case, it is approximately 3.9 millimeters. Smaller pixel pitches, such as P3.9, indicate higher pixel density, resulting in higher resolution and sharper image quality, especially for viewers who are in close proximity to the display.

2. P7.8 Pixel Pitch: The value "7.8" refers to the vertical distance between the centers of two adjacent lamp beads (pixels) on the LED screen. In this case, it is approximately 7.8 millimeters. The vertical pixel pitch may be slightly larger than the horizontal pixel pitch, which can be an intentional design choice for certain applications or to achieve a specific aspect ratio for the display.

3. Transparent Glass Window Wall: As mentioned earlier, the LED screen is designed for transparent installations on glass surfaces, such as glass windows or glass walls. Its high transparency allows people to see through the glass even when the display is in operation, making it suitable for applications where visual content needs to be displayed without obstructing the view.

4. High Brightness and Contrast: Despite its transparency, the P3.9/7.8 transparent LED screen maintains high brightness levels and contrast, ensuring that the displayed content remains visible and vibrant even in well-lit environments.

5. Lightweight and Thin: The LED screen is designed to be lightweight and thin, making it easier to handle, transport, and install.