![]() ![]() This inbox percentage to nits mapping uses human vision and color science research to provide a perceptually linear brightness slider. On nits-based brightness systems, since the each nit level is expected to be calibrated, an inbox percentage to nits mapping is provided. The mapping of backlight percentages to luminance values should follow an exponential pattern. On percentage systems, a mapping between the backlight percentages and luminance values is necessary. Systems that don't support nits brightness control must support percentage values. Controlling brightness using percentage values Per-device calibration during production of each device gives the best end results. Therefore, calibration on nits-based brightness systems should be done at least once with the final form factor design as opposed to doing calibration on development form factors and applying the result to the final form factor. Placement of the components, glass transparency, and similar factors can greatly influence the lux and nits. Windows 10, version 1809 tolerates small inaccuracies that may occur during the manufacturing process of these systems. ![]() There is no need for any ALR curve on these devices.įor these systems, it is critical that light sensors and display are accurately calibrated. When a device bears a properly calibrated display and properly calibrated sensor, brightness control should work out of the box. The nit (candela per square meter) is an International System of Units (SI) unit of luminance. Starting with Windows 10, version 1809, the system will control brightness using nits on devices which display driver exposes the DXGK_BRIGHTNESS_INTERFACE_3 interface. Sufficient display brightness levels should be exposed to ensure smooth dimming.Ensure that display is capable of dimming smoothly across all the accessible brightness levels.The display implementation must be carefully optimized. Tools to measure display brightness are called luminance meters or brightness meters, and are available for purchase from electronic equipment vendors and online retailers. Calibration should be performed at various intensities by measuring nits values with a high-quality nits meter at different locations of the display while displaying a white background. If the system supports setting brightness in nits by having the display drive expose the DXGK_BRIGHTNESS_INTERFACE_3 interface, the display should be properly calibrated. Down-level Windows versions will control brightness using percentage values. If both DXGK_BRIGHTNESS_INTERFACE_2 and DXGK_BRIGHTNESS_INTERFACE_3 interfaces are exposed by the display driver, Windows 10, version 1809 and later will control brightness using nits values. The DXGK_BRIGHTNESS_INTERFACE_3 interface is ignored on down-level Windows versions. If a display driver exposes the DXGK_BRIGHTNESS_INTERFACE_3 interface, Windows 10, version 1809 and later controls brightness using nits values. If a display driver only exposes the DXGK_BRIGHTNESS_INTERFACE_2 interface, the system will control brightness using percentage values. ![]() Windows detects the type of brightness interface exposed by the display driver and selects the most appropriate one. And therefore, enables very smooth and accurate brightness transitions.
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