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III. Scenario and Technical Solution Analysis (Full Outdoor / Semi-Outdoor / Indoor)

(I) Full Outdoor Displays (Plazas, Outdoor Large Screens, Building Facades, Transportation Hubs)

Core Challenges: Large fluctuations in ambient light intensity (10,000-12,000 lux at noon on sunny days, 5,000-8,000 lux on cloudy days, ≤500 lux at night), requiring a balance between high brightness for strong light resistance, low brightness for light pollution prevention, and high stability for anti-aging performance.

1. Cloudy/Rainy Conditions

• Environmental Characteristics: Soft light, no direct sunlight, ambient light 5,000-8,000 lux, high air humidity.
• Brightness Requirement: 3,000-4,500 cd/m² to ensure clear and vivid pictures, avoiding brightness attenuation due to humidity.
• Technical Solutions:
• Adopt standard outdoor high-brightness lamp beads (R≥200 mcd, G≥600 mcd, B≥150 mcd+).
• Equip black high-contrast masks to enhance picture layering.
• Control system with humidity-linked dimming: slightly increase brightness to compensate for attenuation when humidity rises.
• IP65 protection rating for moisture and dust resistance, preventing lamp bead light attenuation due to moisture.

2. Daytime/Direct Sunlight Conditions

• Environmental Characteristics: Direct sunlight at noon on sunny days, ambient light 10,000-12,000 lux, strong light causing washed-out and unreadable pictures, high-temperature environment.
• Brightness Requirement: 4,500-10,000 cd/m² (maximum brightness range for outdoor displays) to counter direct sunlight and ensure visibility.
• Technical Solutions:
• Select outdoor ultra-high-brightness lamp beads (large-size chips, high-voltage specifications: R≥300 mcd, G≥800 mcd, B≥200 mcd+).
• Equip high-reflectivity PCBs + high-transmittance anti-glare masks to reduce light refraction loss.
• Adopt static scanning (1/1S) or 1/2 scanning to extend lamp bead luminous duration per unit time.
• Enhanced heat dissipation design (aluminum heat sink housing + intelligent temperature-controlled fans) to avoid accelerated light attenuation under high temperatures.
• High-refresh driver IC (≥3,840 Hz) for stable, flicker-free pictures under strong light.

3. Nighttime Conditions

• Environmental Characteristics: Ambient light ≤500 lux, dim light; high brightness causes light pollution and glare.
• Brightness Requirement: ≤1,000 cd/m² (compliance limit); ≤800 cd/m² in first-tier cities for nighttime brightness control.
• Technical Solutions:
• Equip light-sensing intelligent dimming system to monitor ambient light in real time and automatically switch to low-brightness mode.
• Adopt low-brightness high-grayscale drivers (16bit+ grayscale) for non-grainy, artifact-free and color-accurate pictures at low brightness.
• Lock maximum brightness limit in night mode to avoid excessive brightness from misoperation.
• Anti-glare coating on masks to reduce light scattering and minimize impact on surrounding residents and traffic.
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(II) Semi-Outdoor Displays (Indoor-Outdoor Transition Scenarios)

Core Challenges: Situated between indoor and outdoor environments, with direct sunlight/reflection and viewing angles spanning indoor and outdoor areas, requiring higher brightness than indoor displays and lower brightness than full outdoor displays.

1. Display Indoors, No Direct Sunlight, Viewed Outdoors

• Environmental Characteristics: Installed indoors (shopping mall windows, store entrances), no direct sunlight, strong outdoor reflected light, viewing distance 3-10 meters.
• Brightness Requirement: 1,500-2,500 cd/m² to balance indoor installation and outdoor visibility.
• Technical Solutions: Indoor high-brightness lamp beads + dark/high-contrast masks, high-refresh drivers, IP54 protection (dust and splash resistance).

2. Display Indoors, Direct Sunlight, Viewed Outdoors

• Environmental Characteristics: Close to floor-to-ceiling windows or glass curtain walls, direct sunlight on the screen, strong glare, easily washed-out pictures.
• Brightness Requirement: 2,500-3,500 cd/m² (maximum range for semi-outdoor displays) to resist direct sunlight.
• Technical Solutions: Specialized semi-outdoor high-brightness lamp beads, anti-glare anti-reflective masks, wide-temperature driver ICs, enhanced heat dissipation (to counter temperature rise from direct sunlight).

3. Display in Sheltered Outdoor Areas (Eaves, Outdoor Corridors), Viewed Outdoors

• Environmental Characteristics: Installed under eaves, in corridors or under sunshades, no direct rain, strong scattered light.
• Brightness Requirement: 2,500-3,500 cd/m² to balance outdoor lighting and shelter protection.
• Technical Solutions: Semi-outdoor lamp beads, standard outdoor masks, IP65 waterproofing, low scan ratio design for stable brightness.

(III) Indoor Displays (Conference Rooms, Exhibition Halls, Retail Stores, Studios)

Core Challenges: Weak ambient light, short viewing distance, long viewing duration, requiring a balance between brightness, eye protection and color reproduction.

1. Standard Indoor Scenarios (Conference Rooms, Ordinary Exhibition Halls, Offices)

• Environmental Characteristics: Ambient light 50-300 lux, no strong direct light, viewing distance 2-5 meters.
• Brightness Requirement: 500-800 cd/m² for eye-friendly, glare-free and clear pictures.
• Technical Solutions: Standard indoor lamp beads, low-power drivers, standard matte masks, brightness uniformity ≥97%.

2. High-Brightness Indoor Scenarios (Shopping Mall Windows, Windowed Exhibition Halls, Backlit Viewing)

• Environmental Characteristics: Close to windows/glass doors, sunlight reflection/weak direct light, backlit viewing.
• Brightness Requirement: 800-1,200 cd/m² to resist ambient light interference.
• Technical Solutions: Indoor high-brightness lamp beads, high-contrast black masks, high-refresh drivers for enhanced picture clarity in backlit conditions.

3. Low-Brightness Indoor Scenarios (Studios, Control Rooms, Nighttime Conference Rooms, Close Long-Term Viewing)

• Environmental Characteristics: Ambient light ≤50 lux, dim light, viewing distance 1-3 meters, prone to fatigue with long viewing.
• Brightness Requirement: ≈400 cd/m² for eye-friendly low glare.
• Technical Solutions:
• Specialized low-brightness high-grayscale drivers (18bit grayscale) for pure color and noise-free pictures at low brightness.
• Low-glare soft masks to reduce direct light to the eyes.
• Color temperature stabilization technology to avoid color shift at low brightness.

IV. Conclusion

1. Core Brightness Logic: Adaptation is Key. Higher brightness is not better—brightness must be precisely matched to ambient light based on scenarios. Outdoor displays require high brightness to counter strong light during the day and low brightness to prevent pollution at night; indoor displays need low brightness for eye protection and high-brightness models for backlight resistance. Adaptation is the optimal solution.
2. Brightness Calculation: Parameters Determine the Upper Limit. The brightness of outdoor displays is jointly determined by four key parameters: lamp bead specifications, pixel density, scan mode and light attenuation rate. Precise calculation via formulas during selection avoids deviations between theoretical and actual brightness.
3. Scenario Classification: Precise Technical Adaptation. Full outdoor displays adopt graded designs for sunny/cloudy/nighttime conditions; semi-outdoor displays focus on resisting direct sunlight and glare; indoor displays prioritize eye protection and color reproduction. Graded selection balances display performance, power consumption, lifespan and compliance.
4. Long-Term Value: Balancing Performance and Cost. Reasonable brightness configuration reduces power consumption, minimizes lamp bead light attenuation, extends device lifespan, and mitigates compliance and safety risks such as light pollution and glare, maximizing the full-lifecycle value of LED displays.