Keyboard Backlight Module Structure for Uniform Keycap Illumination

The patent applies local quality by creating different optical structures at different locations on the lighting board. Micro-structure regions are formed at specific positions to recycle and redirect light, while a protruding structure is created at the LED position to enhance light extraction. This localized structural differentiation ensures that low luminous LEDs can provide uniform illumination across the entire keyswitch area, including corner symbols, without increasing power consumption.

The patent introduces intermediary optical structures between the LED and the keyswitch to improve light distribution. The protruding structure acts as an intermediate element that enhances light extraction from the LED, while micro-structure regions serve as intermediate elements that recycle and redistribute light across the lighting board. These intermediary structures enable uniform light distribution without requiring higher LED luminous output, thus maintaining low heat generation.

The patent applies beforehand cushioning by designing a protruding structure on the lighting board that creates a physical constraint and alignment feature for the illuminant unit. This protruding structure is formed beforehand during PCB manufacturing, providing a built-in positioning mechanism that compensates for potential mounting offsets. The structure ensures stable electrical and mechanical connection without complicating the manufacturing process, as it is integrated into the PCB fabrication steps.