Outdoor naked-eye 3D screens primarily use common LED display modules. The principle behind their naked-eye 3D effect can be found in relevant technical analysis articles. The following focuses on the core fundamentals of LED displays:
Pixel: The smallest light-emitting control unit in an LED display. Each pixel can independently adjust its brightness and color.
Pixel Pitch: The physical distance between the center points of adjacent pixels, usually measured in millimeters (mm). Smaller pixel pitch results in higher pixel density per unit area and a more detailed image.
Resolution:
Module Resolution: The total number of pixels contained in a single display module.
Cabinet Resolution: The total number of pixels in a cabinet unit composed of multiple modules.
Screen Resolution: The total number of pixels in the entire display screen, determining image clarity.
Viewing Angle:
Horizontal Viewing Angle: The angle range when brightness drops to 50% of its maximum value in the left-right direction.
Vertical Viewing Angle: The angle range when brightness drops to 50% of its maximum value in the up-down direction.
Total Viewing Angle: The sum of the horizontal and vertical viewing angles, affecting the viewing effect from multiple angles.
Viewing Distance:
Closest Viewing Distance: The minimum distance at which the human eye can clearly distinguish image details.
Optimal Viewing Distance: The most comfortable viewing distance for a clear, pixel-free viewing experience.
Maximum Viewing Distance: The furthest distance from which the image content remains discernible.
Brightness: Luminous intensity per unit area, measured in nits (cd/m²). High brightness is suitable for bright outdoor environments, but energy consumption and light pollution must be balanced.
Refresh Rate: The number of times the image updates per second, measured in Hertz (Hz). High refresh rates (e.g., 3840Hz) eliminate screen flicker and are suitable for dynamic video displays.
Moiré Pattern: A wavy interference pattern that occurs when the screen's pixel arrangement is close to the spatial frequency of the camera's sensor. This can be reduced by optimizing the pixel arrangement or adjusting the shooting angle.
Grayscale Level: The number of technical processing levels from darkest to brightest at the same brightness. High grayscale (e.g., 16-bit) provides more subtle color transitions and details.
Contrast Ratio: The ratio of brightness between the brightest white and the darkest black areas. High contrast ratio (e.g., 5000:1) enhances the image's depth and three-dimensionality.
Color Temperature:
Warm White: Color temperature below 6500K, leaning towards reddish-yellow tones.
Neutral White: Color temperature 6500K, neutral white.
Cool White: Color temperature above 6500K, leaning towards bluish tones.
Scanning Method:
Static Scan: The driver IC performs "point-to-point" independent control of each pixel, resulting in high image stability but higher cost.
Dynamic Scan: The driver IC performs "point-to-column" control of pixels, achieving display through rapid switching, lower cost but potentially causing flickering.
IP Rating:
Dustproof Rating (first digit):
0: No protection.
6: Completely dustproof.
Waterproof Rating (second digit):
0: No protection.
8: Can withstand prolonged immersion in water (e.g., underwater to 1 meter).
Selection Recommendations: The parameters of the LED display directly affect image quality, but the configuration should be selected based on the actual needs of the scenario:
Ambient Light: High brightness (≥5000cd/m2) and high contrast are required in strong outdoor light environments. Climate conditions: Rainy areas require IP65 or higher waterproof rating; dusty environments require IP6X dustproof rating.
Viewing angle: Wide-angle scenes require a wide viewing angle (e.g., 160° horizontal/140° vertical).
Budget balance: High configuration does not guarantee optimal performance; a balance between cost and performance requirements is necessary.
