When designing outdoor LCD screens for applications such as digital signage, public information displays, or industrial monitoring systems, selecting the correct display ratio is critical—not just for visual clarity, but also for compatibility with legacy systems and optimal space utilization. Among the most commonly used ratios in outdoor environments, the 4:3 aspect ratio remains a preferred choice for 15", 17", and 19" screen sizes, especially in regions where older video standards (like VGA or analog broadcast) are still in use.

The 4:3 ratio offers a balanced rectangular shape that provides more vertical space than modern 16:9 widescreen formats—making it ideal for displaying text-heavy content, data dashboards, or multi-line information such as weather updates, train schedules, or emergency alerts. For example, a 17" outdoor LCD screen with a 4:3 ratio delivers approximately 1280 x 1024 pixels resolution (SXGA), which ensures sharp readability even under direct sunlight when paired with high-brightness panels (typically 5000–7000 nits). This resolution aligns well with many embedded systems and legacy software platforms still deployed in transportation hubs, retail kiosks, and municipal installations.

Industry standards such as IEC 62368-1 and EN 62368-1 emphasize mechanical and electrical safety for outdoor displays, particularly regarding thermal management and ingress protection (IP65 or higher). The compact footprint of 15", 17", and 19" 4:3 screens allows for easier mounting on poles, walls, or vehicle-mounted enclosures without compromising structural integrity or heat dissipation. Moreover, these sizes are cost-effective for small-scale deployments compared to larger 24" or 32" models, making them a popular choice among municipalities and small businesses seeking scalable solutions.

From an engineering perspective, the 4:3 format reduces pixel density requirements per inch while maintaining high visibility—critical for outdoor conditions where glare and ambient light can reduce perceived contrast. According to a 2023 study by the Society for Information Display (SID), 4:3 displays outperform 16:9 in readability under low-light conditions due to better vertical line spacing and font rendering.

In summary, the 4:3 aspect ratio for 15", 17", and 19" outdoor LCD screens continues to be a trusted standard in global markets due to its proven performance, compatibility, and ergonomic design. Whether deploying in harsh climates or urban environments, choosing the right display ratio ensures long-term reliability, user satisfaction, and efficient integration into existing infrastructure.