Multi-Layer Light Guide Plate Backlight Module for Keyboard Illumination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional direct-lit backlight modules suffer from uneven illumination in keyboards due to attenuated light intensity with increasing distance, which existing solutions cannot fully compensate for due to manufacturing limitations.
Innovation Solution
The use of multiple light guide plates with varying hole diameters and spatial volumes, allowing light to enter and be redirected through each plate to maintain consistent illumination across key caps, with each plate optimized to handle light at different angles and distances from the light emitting component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If dots are disposed at higher densities on the light guide plate to compensate for distance attenuation, then illumination uniformity is improved, but manufacturing complexity increases and density cannot exceed certain limits
Solution Approach 1:
The light guide plate is divided into multiple light guide plates with different optical properties. Each light guide plate has holes with different diameters at different positions, creating segmented regions that selectively transmit light at different angles. This segmentation allows the system to achieve illumination uniformity without requiring excessive dot density on a single plate, thus reducing manufacturing complexity.
Solution Approach 2:
Different regions of the light guide plates are designed with different hole diameters to create local optical characteristics. The first light guide plate has smaller holes while the second light guide plate has larger holes, allowing each region to optimize light transmission for its specific distance from the light emitting component. This local quality approach replaces the need for uniformly high dot density across the entire plate.
2Device complexity
If a single light emitting component is used to reduce manufacturing cost, then device complexity is reduced, but illumination uniformity deteriorates due to light intensity attenuation with distance
Solution Approach 1:
The solution moves from a single-plane light guide structure to a multi-layer stacked structure. By adding the vertical dimension with multiple light guide plates, the system can distribute light transmission functions across different layers. The first and second light guide plates work together to address illumination at different distances from the light emitting component, achieving uniformity without adding more light emitting components.
Solution Approach 2:
The light guide system uses composite structure with multiple light guide plates having different optical characteristics. The combination of first light guide plate (with smaller holes) and second light guide plate (with larger holes) creates a composite optical system that compensates for the limitations of a single light emitting component, achieving illumination uniformity through material/structure composition rather than component multiplication.
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
This design effectively reduces energy loss and ensures uniform illumination by utilizing each light guide plate to compensate for distance-related intensity variations, enhancing the overall luminance and consistency of keyboard lighting.
Implementation Method 1
a first light guide plate (30) and a second light guide plate (40), wherein the first light guide plate (30) is disposed above the light emitting component (20)... enabling light emitted from the light emitting component (20) to enter the first light guide plate (30)... and to enter the second light guide plate (40)
Data Source
AI summary
A backlight module is disclosed. The backlight module includes a light emitting component, a first light guide plate and a second light guide plate. The first light guide plate is disposed above the light emitting component and includes a first hole located correspondingly to the light emitting component. The second light guide plate is disposed between the light emitting component and the first light guide plate and includes a second hole. The second hole is located corresponding to the light emitting component and communicates with the first hole. The diameter of the second hole is greater than the diameter of the first hole.