Keyboard Backlight Board Structure for Low-Power Uniform Illumination
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Solution Overview
Problem
Existing lighting keyboards face issues with inconsistent illuminating consistency due to over-illumination of main symbols, under-illumination of corner symbols, and uneven lighting around keycaps, particularly with low luminous LEDs which struggle to maintain uniformity across single and multiple keyswitches.
Innovation Solution
A backlight module comprising a lighting board with a reflective layer, micro-structure regions, and a light guide plate that incorporates a light emitting unit with color dies, where the reflective layer and micro-structure regions enhance light reflection and lateral transmission to achieve consistent color mixing and uniform illumination across keycaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a low luminous LED is used to illuminate each keyswitch, then power consumption is reduced, but illuminating consistency deteriorates
Solution Approach 1:
The backlight module segments the illumination function by separating the light emitting unit from the light guide plate. Multiple color dies are arranged in an array within the light guide hole, allowing independent control and optimization of light emission patterns for different keyswitch areas, thereby maintaining consistency with low power consumption.
Solution Approach 2:
Different regions of the keyswitch receive differentiated light treatment through the light guide plate design. The plate creates localized light paths that ensure corner symbols and main symbols receive appropriate illumination levels, achieving uniform visual effect across different areas while using low luminous LEDs.
2Device complexity
If a low luminous LED is used, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The light emitting unit integrates multiple color dies, bonding pads, and connection structures into a single modular component that is pre-assembled and tested. This merged unit is then easily installed into the light guide hole, reducing overall device complexity while ensuring precise alignment through the integrated design.
Solution Approach 2:
The light guide plate serves as an intermediary component that mediates between the light emitting unit and the keyswitch illumination areas. It contains the light guide hole that precisely positions the light emitting unit and distributes light uniformly, simplifying the assembly process while maintaining high precision requirements for the interface between components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly improves the overall illuminating consistency and uniformity of lighting keyboards by optimizing light distribution and recycling, ensuring better light output and connection stability, even with low power LEDs.
Implementation Method 1
at least one of the first reflective layer, the lighting circuit and the plurality of conductive pads are partially exposed within the light guide hole to reflect different color lights directly or indirectly from the plurality of color dies
Implementation Method 2
enter the light guide plate for lateral transmission and color-mixing
Data Source
AI summary
A backlight module configured to illuminate at least one key cap of a lighting keyboard. The backlight module includes a lighting board, a light emitting unit and a light guide plate. The lighting board has a first reflective layer, a lighting circuit and two aligned micro-structure regions, all three at least partially being layered in parallel with each other. The two micro-structure regions reflect lights and are separated by the lighting circuit. The light emitting unit includes plural color dies connecting electrically with the lighting circuit. The light guide plate has a light guide hole for accommodating the light emitting unit. The color dies of the light emitting unit are aligned linearly, while the two micro-structure regions of the lighting board are aligned in perpendicular to the linearly-aligned color dies, with the micro-structure regions disposed at opposite sides the light emitting unit.