Backlit Key Bottom Plate Protrusions Prevent Light Leakage
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Solution Overview
Problem
Light leakage from assembly gaps in keyboard modules with backlight systems affects light uniformity and user convenience, especially 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 keycap in a way that the protrusions shield the gap between them, ensuring uniform illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a backlight module is added to illuminate keys in low-light environments, then key visibility is improved, but light leakage from assembly gaps occurs affecting light uniformity
Solution Approach 1:
The bottom plate is segmented into multiple functional regions: a light-shielding portion that blocks light leakage from assembly gaps, and a light-transmitting portion that allows light to pass through to illuminate the keycap. This segmentation resolves the contradiction by directing light through controlled paths while blocking unwanted leakage.
Solution Approach 2:
Different portions of the bottom plate have different optical properties: the light-shielding portion has light-blocking characteristics to prevent leakage from gaps, while the light-transmitting portion has light-passing characteristics to provide illumination. This local differentiation of properties resolves the contradiction between preventing light leakage and maintaining uniform illumination.
2Ease of operation
If assembly gaps are reduced to prevent light leakage, then light uniformity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The bottom plate acts as an intermediary component between the backlight module and keycap. Its light-shielding portion specifically addresses light leakage from assembly gaps without requiring the gaps themselves to be minimized, thus improving light uniformity without imposing stringent manufacturing precision requirements.
3Ease of manufacture
If the bottom plate structure is simplified, then manufacturing cost is reduced, but light leakage prevention capability is weakened
Solution Approach 1:
The bottom plate serves multiple functions simultaneously: it provides structural support, defines the assembly interface between keycap and backlight module, and incorporates light-shielding and light-transmitting portions to control light distribution. This multi-functionality allows effective light leakage prevention without requiring additional specialized components, maintaining manufacturing simplicity.
Data Source
AI summary
A key structure including a keycap, a 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. 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.