Luminance in nits: what it is, how it works and what it does
Luminance in nits is a measure of the light intensity emitted by a screen, expressed in candela per square meter (cd/m²). It is used to quantify the maximum brightness of devices such as mobile phones.
Definition and principles
Luminance is a photometric quantity that describes the intensity of light emitted or reflected by a surface in a specific direction. In the context of electronic device screens, this quantity is commonly measured in nits. One nit is equivalent to one candela per square meter (cd/m²). This unit allows for the standardization of brightness comparisons between different display technologies, such as OLED or LCD.
Applications and scope
The luminance value in nits is a key technical parameter in screen specifications. It indicates the maximum brightness the panel can achieve under optimal conditions. This data is relevant for evaluating screen visibility in high-ambient-light environments, such as outdoors under direct sunlight.
- Performance measurement: Allows comparison of the light emission capacity of different panels.
- Usage context: Higher values are generally associated with better readability in high-light conditions.
Interpretation in products
In device technical sheets, luminance is often presented as a theoretical maximum value. For example, a specification indicating a maximum luminance of 2100 nits (2100 cd/m²) defines the upper brightness limit of the panel. This value should be interpreted alongside other metrics, such as resolution, refresh rate, and contrast ratio, to get a complete picture of the device's visual performance.
Note: Maximum luminance does not guarantee that the device will maintain that brightness level sustainably in all scenes, as it may vary depending on the displayed content and the manufacturer's power management policies.