When LED display screens are applied to special-shaped buildings such as curved curtain walls and spherical domes, traditional flat screens frequently have problems such as splicing gaps and pixel distortion due to insufficient bending precision. The bending precision control technology of curved screens provides a "millimeter-level adaptation solution" for special-shaped building displays through full-process parametric management. This technology is based on finite element analysis and combines the material properties of flexible substrates to control the bending error of the display screen within ±0.3mm, achieving precise fitting between the building surface and the display surface.

Preliminary surveys require the use of three-dimensional laser scanning to collect point cloud data of the building surface, generate a curved surface model with an accuracy of 0.1mm, and then use CAD software to convert the model into a display screen bending path diagram, marking the curvature radius and bending angle of key bending points. Taking cylindrical buildings as an example, when the radius of curvature is less than 5 meters, flexible modules below P2.5 are required, and the bending radius of the substrate can be as low as 300mm, while the minimum bending radius of traditional rigid modules is 800mm, which far exceeds the adaptation requirements of special-shaped buildings.

The bending process control includes "three-stage calibration": in the pre-bending stage, the module is placed on a CNC bending machine and slowly bent at a rate of 0.5°/second. At the same time, the substrate temperature is monitored by an infrared thermal imager to ensure that the flexible material is in the best bending range of 60-80℃; in the finalization stage, the module is fixed with a vacuum adsorption tooling and kept at room temperature for 48 hours to eliminate internal stress; in the splicing stage, a laser rangefinder is used to monitor the joint error of adjacent modules in real time, and the joint is made less than 0.5mm by fine-tuning the bending angle. In the spherical dome project of a city concert hall, after adopting this control technology, the curved screen composed of 1,200 flexible modules achieved a bending accuracy of ±0.25mm, and the pixel distortion rate was less than 1%, which is far lower than the industry standard of 3%.

In terms of material selection, different substrates need to be matched according to the complexity of the building surface: for single-curvature surfaces, polyimide (PI) flexible substrates can be selected, with a tensile strength of 150MPa; for complex double-curvature surfaces, metal grid flexible substrates are required, and the copper foil grid structure is used to increase the elongation rate to 20%. From the wavy facade of the commercial complex to the elliptical dome of the Science and Technology Museum, the precise bending accuracy control of the curved screen is allowing the LED display to break through the plane limitation, presenting a seamless visual spectacle on special-shaped buildings, and providing key support for the integration of architectural aesthetics and display technology.