In window displays, insufficient LED display transmittance can obscure product displays. However, a scientific transmittance selection formula can precisely match display requirements, ensuring the screen presents advertisements without obscuring product details. This formula uses the human eye's visual transparency threshold as a benchmark, combining ambient light parameters and product characteristics to construct a quantitative selection model.

Basic selection formula: T ≥ (Lc × K) / La

T is the transparent screen transmittance (%), La is the ambient light intensity (lux), Lc is the critical illuminance (lux) required for clear product display, and K is the ambient light reflection correction factor (0.6-0.8). Taking a luxury goods display window as an example, if the outdoor light intensity La = 5000 lux and the product requires Lc = 800 lux for clear display, and K = 0.7, then T ≥ (800 × 0.7) / 5000 = 11.2%, indicating that a transparent screen with a transmittance of ≥ 12% should be selected. Parameter Correction Factors

1. Product Reflectivity Correction: Highly reflective products (such as watch mirrors) require a 5-8% increase in transmittance to avoid overlapping reflections from the display. Matte products can have their transmittance reduced by 3%.

1. Viewing Distance Correction: When viewers are within 3 meters of the display window, transmittance must be increased by 10% to minimize visual interference from the pixel grid. Beyond 5 meters, this requirement can be reduced by 5%.

1. Screen Pixel Pitch Correction: Transparent screens larger than P4 require an additional 3% increase in transmittance to compensate for light obstruction caused by the pixel structure. This correction is negligible for fine-pitch screens smaller than P2.5.

Scenario-Based Selection Examples

 Jewelry Display Windows: Use P3 transparent screens (18% transmittance) with overhead spotlights (3000 lux). The formula calculates T ≥ (500 × 0.7) / 3000 = 11.6%. 18% transmittance allows the reflections from diamond facets to coexist with the on-screen advertising. This has been shown to increase customers' attention to product details by 40%.

 Clothing Display Windows: Use P5 transparent screens (25% transmittance). When outdoor light intensity La = 8000 lux, T ≥ (300 × 0.7) / 8000 = 2.6%. 25% transmittance allows the fabric texture on the models to be clearly visible, complementing the dynamic fashion shows on the screen with the actual product displays.

 Automotive 4S Store Windows: Extra-large transparent screens (area > 50 m2) must meet T ≥ 20%. Polarized film is used to eliminate sunlight reflection. A reflection correction for metallic paint (+7%) is incorporated into the calculation to ensure both the on-screen advertising and the actual vehicle's exterior are clearly visible. Screen selection also depends on the screen structure: Wire mesh transparent screens offer up to 40% transmittance but low pixel density, making them suitable for distant viewing. Film-type transparent screens offer 20-30% transmittance but high resolution, making them suitable for close-up display windows. By using this formula to scientifically select the right screen, transparent screens can achieve the dual benefits of "unobstructed advertising and full display of product details" in window displays, giving commercial display spaces a technological feel while retaining the appeal of the merchandise.