Light Guide Plate Lateral Leakage Prevention
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Solution Overview
Problem
Conventional luminous keyboard devices suffer from lateral light leakage due to thin lateral edges, which affects uniform illumination and slimness requirements.
Innovation Solution
Incorporating elongated slots and light-absorbing parts on the light guide plate to redirect and absorb light beams, preventing leakage and enhancing illumination uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the lateral edge of the light guide plate is made thin to achieve device slimness, then the overall device thickness is reduced, but lateral light leakage occurs affecting illumination uniformity
Solution Approach 1:
The patent applies local quality by making the lateral edge of the light guide plate have a different structure from the main body. Specifically, the lateral edge is designed with a light-absorbing layer or light-trapping structure that has different optical properties than the transparent main body, allowing the thin edge to absorb leaked light rather than transmit it, thus maintaining both slimness and illumination uniformity
Solution Approach 2:
The patent converts the harmful effect of light leakage from the thin lateral edge into a beneficial effect by introducing light-absorbing materials or light-trapping structures at the lateral edge. These structures deliberately absorb or trap the light that would otherwise leak out, converting the potential defect (light leakage) into a feature that maintains illumination uniformity while preserving the slim device profile
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 effectively reduces lateral light leakage and ensures uniform key illumination, maintaining device slimness while improving light utilization efficiency.
Implementation Method 1
The light guide plate is disposed on the base and located at a side of the at least one light-emitting element for guiding the at least one light beam to the plural light-outputting zones of the plural keys
Implementation Method 2
The at least one light-absorbing part is located at the lateral edge of the light guide plate. When the light beam is incident into the lateral edge of the light guide plate, the light beam is absorbed by the light-absorbing part
Data Source
AI summary
A luminous keyboard device includes plural keys, a light-emitting element, and a light guide plate. By the light guide plate, a light beam emitted by the light-emitting element is guided to the plural keys. The light guide plate includes plural elongated slots and a light-absorbing part. The plural elongated slots are located near a lateral edge of the light guide plate. After the light beam transferred within the light guide plate is transmitted through the elongated slots and departed from the light guide plate, the fraction of the light beam introduced into the lateral edge of the light guide plate is reduced. The light-absorbing part is located at the lateral edge of the light guide plate for absorbing the portion of the light beam which is introduced into the lateral edge of the light guide plate. Consequently, the lateral light leakage of the light guide plate can be avoided.