Keyboard Backlight Module Structure for Halo-Free Symbol Illumination
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Solution Overview
Problem
Conventional lighting keyboards suffer from non-uniform illumination, with symbols on keycaps appearing either too bright or too dim due to the placement of hydrogel light guiding components, leading to inconsistent lighting intensity and halo formation.
Innovation Solution
A back light module comprising a lighting unit, a light guide plate, a light penetrating membrane, a light calibration layer, and an adhering component with specific contours and coverage areas, where the adhering component's light guiding properties act as an auxiliary illumination source to achieve uniform illumination across keyswitch symbols, using a light calibration layer to adjust and stabilize the illumination intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the adhering component is used as auxiliary illumination source, then illumination uniformity is improved, but device complexity increases
Solution Approach 1:
The adhering component serves dual functions: it provides adhesion to bond the light guide plate and light penetrating membrane, and simultaneously acts as an auxiliary illumination source due to its light guiding properties. This multi-functionality improves illumination uniformity without requiring additional dedicated components, thereby avoiding increased device complexity.
2Illumination intensity
If the light calibration layer adjusts illumination intensity, then illumination uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The adhering component is divided into distinct regions: a front region that is fully covered by the light calibration layer, and a rear region that is partially or not covered. This segmentation provides clear manufacturing guidelines for the light calibration layer deposition process, making it easier to achieve precise coverage control and reducing manufacturing precision requirements.
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 ensures preferred illumination intensity and uniformity on both sides of the keycap, regardless of the lighting unit's position, while minimizing halo formation, thereby enhancing the overall lighting experience in keyboards.
Implementation Method 1
The adhering component has a light guiding property, and the symbol on the keycap 104 of the keyswitch is too bright if the keyswitch is disposed right above a contour of the hydrogel 113
Implementation Method 2
The black ink layer 114 weakens the illumination beam transmitted from the hydrogel 113 toward the keycap 104
Data Source
AI summary
A back light module is applied to a lighting keyboard with a plurality of keyswitches and includes a lighting unit, a light guide plate, a light penetrating membrane, a light calibration layer and an adhering component. The light guide plate has an opening used to accommodate the lighting unit. The light penetrating membrane is disposed on the light guide plate. The light calibration layer is disposed on the light penetrating membrane and has a second contour. The adhering component is disposed between the light guide plate and the light penetrating membrane, and has a first contour greater than the second contour. The adhering component includes a front region, a rear region and a hollow region. The front region is covered by the light calibration layer. The rear region is partly covered or not covered by the light calibration layer. The hollow region corresponds to and is larger than the opening.