Abstract
A keyboard backlight control system is disclosed that improves energy efficiency and user experience by combining ambient-light gating with spectral slope detection. The system uses an ambient color sensor to measure illuminance and color temperature changes over time. When ambient illumination exceeds a predefined threshold, keyboard backlight activation is suppressed regardless of user input events. In low-light conditions, rapid changes in brightness or color temperature are used to infer impending user interaction, triggering a low-level pre-illumination state prior to keyboard use. The approach requires no additional hardware sensors and can be implemented using existing system components such as an ambient color sensor and embedded controller.
Creative Commons License
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Recommended Citation
INC, HP, "Energy-Saving Keyboard Backlight Control Using Ambient Light Gating and Spectral Slope Detection", Technical Disclosure Commons, (April 16, 2026)
https://www.tdcommons.org/dpubs_series/9798