Light Source Module Microstructure Reflection Angle Optimization
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Solution Overview
Problem
Conventional light source modules experience significant energy attenuation due to repeated reflections between the prism sheet and the reflection sheet, leading to reduced illumination, and existing solutions like increasing the number of light sources or microstructure density on the light guide plate are costly and offer limited improvements.
Innovation Solution
A light source module design featuring a light guide plate with a reflection sheet having microstructures that adjust the reflection angle of the light beam, allowing it to bypass the first prism sheet and exit the light guide plate effectively, thereby reducing reflections and enhancing illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the number of light sources or microstructure density on the light guide plate is increased to improve illumination, then the illumination is improved, but the cost increases
Solution Approach 1:
The patent changes the geometric parameters of the microstructures on the reflection sheet, specifically the inclination angle of the reflective surfaces, to optimize light reflection efficiency. By adjusting these parameters, the system achieves improved illumination without increasing the number of light sources or microstructure density, thereby avoiding increased manufacturing costs
Solution Approach 2:
The patent applies microstructures with specific reflective properties at particular locations on the reflection sheet, creating non-uniform local characteristics. The microstructures are strategically positioned and designed with varying inclination angles to optimize light extraction at different regions, achieving overall improved illumination without uniformly increasing microstructure density across the entire system
2Illumination intensity
If the number of light sources is increased to improve illumination, then the illumination is improved, but the device complexity increases
Solution Approach 1:
The patent extracts and utilizes the unused reflected light that would otherwise be lost through repeated reflections between the prism sheet and reflection sheet. By introducing microstructures on the reflection sheet, the system captures and redirects this wasted light toward the light exit surface, effectively converting a harmful factor into a useful resource and improving illumination without adding more light sources or increasing device complexity
3Illumination intensity
If microstructures with different density or shapes are disposed on the light guide plate to improve illumination, then the illumination is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the geometric parameters of the microstructures, particularly the inclination angle of the reflective surfaces within a specific range (15-45 degrees), to achieve effective light extraction. This parameter optimization allows for improved illumination while maintaining manufacturability, as the specified angle range balances optical performance with manufacturing feasibility, reducing the stringency of precision requirements
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 increases light extraction and illumination while adjusting the vertical viewing angle, reducing energy attenuation and costs by optimizing the reflection angle with microstructures on the reflection sheet.
Implementation Method 1
the reflection light beam reflected by the reflection sheet is transmitted back to the light guide plate and emitted to the lower prism sheet through the light exit surface of the light guide plate
Implementation Method 2
when the light beam emitted from the light sources enters into the light guide plate, the light beam is guided to transmit to another end of the light guide plate by the principle of total reflection
Data Source
AI summary
A light source module includes a light guide plate, a light source, a first prism sheet and a reflection sheet. The light guide plate includes a light exit surface, a bottom surface opposite to the light exit surface, and a light entrance surface connected to the light exit surface and the bottom surface. The light source is disposed beside the light entrance surface and adapted to emit a light beam to the light entrance surface. The first prism sheet is disposed on the light exit surface and includes first prism units. A surface of the first prism units faces away from the light exit surface. The reflection sheet is disposed on the bottom surface. The light guide plate is located between the reflection sheet and the first prism sheet. The reflection sheet includes microstructures. A surface of the microstructures faces the bottom surface of the light guide plate.