Pedestrians have to repeatedly adjust their posture to avoid the light from the window when watching the store advertising screen;

The dimming or even illegibility of a screen after prolonged use in direct sunlight is essentially the result of the interaction between strong ambient light and the screen's physical properties. The core reasons can be summarized as follows:

1. Luminous efficiency degradation caused by high temperatures.

The brightness of screen pixels (especially LEDs) is positively correlated with the driving current, but high temperatures significantly reduce luminous efficiency. For every 10°C increase in LED chip temperature, brightness decreases by approximately 4% (red LEDs experience even greater degradation, up to 6%). Phosphor conversion efficiency decreases at high temperatures (white LEDs rely on blue chips to excite yellow phosphors). Consequently, the actual output brightness of the screen decreases at the same current.

When exposed to direct sunlight, the screen surface temperature can reach over 70°C (even higher in the black heat-absorbing area). The resulting heat buildup in the screen's internal electronic components (driver IC, power supply) creates a "heat accumulation effect."

2. The bright light washout effect. Midday sunlight can reach over 100,000 lux, while screen brightness is only 5,000-8,000 cd/m² (equivalent to approximately 50,000-80,000 lux). Ambient light competes with screen light.

Even with an anti-glare coating, screen glass still reflects 15%-30% of ambient light (such as the blue sky and buildings). Surface reflection reduces effective brightness.

3. Material Aging and Performance Degradation

Ultraviolet radiation accelerates aging, and thermal expansion stress damage occurs.

Simply put, direct sunlight carries high-density photon energy (especially in the infrared band). Absorbed by the screen, it converts into heat energy. When the temperature rises to a critical point, the high temperature distorts the LED display and causes irreversible photoelectric conversion failure. This damages the display.

How to solve this problem?

The most effective and direct solution is to properly shield the screen and dissipate heat. This is the lowest-maintenance option.

Many customers choose screens with photosensitive or IP68 ratings, but these are expensive. If the screen is not covered, it will still be damaged, but the screen will work slightly longer.

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