Backlit Key Bottom Plate Protrusions Block Light Leakage
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Solution Overview
Problem
The existing key structures with backlight modules in portable electronic devices face issues with light leakage due to assembly gaps, affecting light uniformity and user convenience in low-light environments.
Innovation Solution
A key structure design featuring a bottom plate with protrusions that prevent light leakage by positioning the backlight module and thin film circuit board in a way that the protrusions shield the gap between the keycap and the bottom plate, ensuring light is directed uniformly onto the keycap without escaping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a backlight module is added to illuminate key labels in low-light environments, then visibility of key labels is improved, but light leakage occurs from assembly gaps causing non-uniform light distribution
Solution Approach 1:
The patent applies local quality by creating protrusions with different heights at specific locations around the openings on the bottom plate. These varying height protrusions are strategically positioned to block light leakage paths while allowing light to pass through designated areas, thus achieving both illumination and uniformity without requiring complete sealing of all gaps.
2Ease of operation
If protrusions are added to the bottom plate to block light leakage, then light uniformity is improved, but the structure complexity increases
Solution Approach 1:
The patent merges the light-blocking function with the existing bottom plate structure by integrating protrusions directly into the bottom plate body. This combination eliminates the need for separate light-blocking components or additional assembly steps, achieving light uniformity while minimizing increases in overall structural complexity.
3Object-generated harmful factors
If the protrusions are made taller to better block light, then light leakage prevention is improved, but the risk of contact with supporting elements increases
Solution Approach 1:
The patent applies local quality by creating protrusions with different heights at specific locations around the openings on the bottom plate. These varying height protrusions are strategically positioned to block light leakage paths while allowing light to pass through designated areas, thus achieving both illumination and uniformity without requiring complete sealing of all gaps.
Solution Approach 2:
The patent applies preliminary action by designing the protrusions to extend only to the necessary height to block light leakage before contacting supporting elements. This pre-calculated height ensures adequate light blocking while preventing interference with other components during assembly, maintaining assembly reliability.
Data Source
AI summary
A key structure including a keycap, a bottom plate, a supporting element disposed on the bottom plate a backlight module, and a thin film circuit board is provided. The bottom plate includes a body and a plurality of protrusions, wherein the body has a plurality of openings, and the protrusions protrude from a first surface of the body and are disposed around the openings. At least two of the protrusions have different heights. The backlight module is disposed on a second surface of the body, wherein the first surface and the second surface are opposite surfaces. The thin film circuit board and the keycap are disposed on the first surface of the body, and the thin film circuit board is located between the keycap and the bottom plate, and the protrusions are located within an orthographic projection range of the keycap and do not contact the supporting element.