Developer builds software keyboard light using monitor glow, optimized for OLED displays

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A developer created LightBar For Keyboard, a lightweight Windows app that projects a bright bar at the bottom of the screen to illuminate a physical keyboard without any extra hardware. Built using C# and WPF with assistance from Google's Gemini AI, the app uses the Windows AppBar API to dock the light bar so maximized windows are pushed upward rather than obscured. A single-instance Mutex prevents UI conflicts from multiple launches. The app includes color profiles — pure green, red, and yellow — that target specific OLED subpixels, cutting power consumption by up to 85% compared to a full white bar. The tool is packaged as a self-contained single-file executable on .NET 10.0, making it easy to deploy without installation.

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ProgrammingDEV Community ·

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