Front Light Module Light Guide Assembly Thickness Reduction
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Solution Overview
Problem
The thickness of the light guide plate in front light modules is limited by the service life and size of miniaturized light-emitting elements, restricting the reduction of plate thickness and thus limiting selectable assemblies.
Innovation Solution
A front light module with a light-guide assembly comprising a light guide plate and a light guide element, where the light guide element covers at least 80% of the light guide plate's surface area, allowing for a reduced thickness of the light guide plate while maintaining effective light guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If the light guide plate is thinned to improve light use efficiency, then the weight and thickness are reduced, but the service life and size of the light-emitting element are restricted
Solution Approach 1:
The patent introduces a light guide element with specific refractive index that is disposed on the light guide plate, creating a multi-layer optical structure. This dimensional addition allows the system to achieve effective light guidance with a thinner light guide plate while maintaining reliability through the complementary optical properties of the light guide element
2Length of stationary object
If the light guide plate is thinned to reduce thickness, then the overall size is reduced, but the selectable assemblies are restricted
Solution Approach 1:
The patent specifies that the light guide element has a refractive index between 1.3 and 1.6, which is different from the light guide plate's refractive index of 1.6. This parameter differentiation enables the thin light guide plate to work effectively with the light guide element, expanding the range of selectable assemblies while maintaining reduced thickness
3Use of energy by moving object
If the light guide plate is thinned to improve light use efficiency, then the optical path is optimized, but the light guidance effectiveness is compromised
Solution Approach 1:
The patent creates a composite optical structure by combining the light guide plate (refractive index 1.6) with the light guide element (refractive index 1.3-1.6) that has a different refractive index range. This composite structure optimizes light use efficiency through the light guide plate while the light guide element maintains light guidance effectiveness through its complementary optical properties
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 configuration reduces the weight of the front light module and allows for flexible selection of component specifications, improving light use efficiency and optical features.
Implementation Method 1
a light guide element and a light guide plate, wherein the light guide plate has a first side surface and a first surface respectively connected to each other, the first side surface facing the light-emitting element
Data Source
AI summary
A front light module includes a light-emitting element and a light-guide assembly. The light-guide assembly includes a light guide plate and a light guide element. The light guide plate has a first side surface and a first surface connected to the first side surface. The first side surface faces the light-emitting element. A ratio of a projection area of the light guide element on the first surface to an area of the first surface is greater than 0.8. The light guide plate has a first thickness, and the light guide element has a second thickness. The light-emitting element has a height in the direction. A sum of the first thickness and the second thickness is greater than or equal to the height, and a ratio of the first thickness to the height is less than or equal to 0.75 and greater than or equal to 0.5.