Light Guide Sheet Layout for Uniform Emission and Stray Light Shielding
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Solution Overview
Problem
Current light emitting modules suffer from uneven brightness and lateral stray light, which compromises the visual effects of electronic products.
Innovation Solution
A light emitting module design comprising a base, light guide sheet, circuit board, light emitting unit, and film, with features such as dams, zones of varying transmittance, and microstructures to homogenize light and shield stray light, ensuring uniform brightness and visual effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light emitting module structure is used, then the structure is simple, but the brightness is uneven and lateral stray light occurs
Solution Approach 1:
The light guide sheet is divided into distinct functional regions: a light mixing region with microstructures for light homogenization and a light exit region without microstructures for uniform light output. This segmentation allows each region to perform its specific function optimally, resolving the contradiction between brightness uniformity and structural simplicity.
Solution Approach 2:
Different regions of the light guide sheet are given different local properties: the light mixing region contains microstructures (pyramids, cones, or hemispheres) for light scattering and mixing, while the light exit region maintains a smooth surface for uniform light emission. This local differentiation enables the system to achieve overall brightness uniformity without complicating the entire structure.
2Object-affected harmful factors
If the light guide sheet has uniform structure, then the manufacturing is simple, but lateral stray light cannot be shielded
Solution Approach 1:
The light guide sheet is segmented into a light mixing region with microstructures that control light distribution and a light exit region without microstructures. This segmentation enables the light mixing region to prevent lateral stray light while keeping the light exit region simple for easy manufacturing.
Solution Approach 2:
The light mixing region acts as an intermediary between the light source and the light exit region. It receives light from the LED, mixes and homogenizes it through microstructures, and then directs uniform light to the exit region, thereby preventing lateral stray light while maintaining manufacturing simplicity.
3Illumination intensity
If the film has high transmittance, then the light output is bright, but the circuit board visibility increases
Solution Approach 1:
The film is divided into different transmittance zones: a first zone with high transmittance for bright light output and a second zone with low transmittance for circuit board obscuration. This local quality differentiation allows the film to simultaneously achieve high light output brightness and prevent circuit board visibility in different areas.
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 design achieves uniform light emission and effective shielding of stray light, enhancing the visual appeal of electronic products by minimizing bright spots and lateral light leakage.
Implementation Method 1
the light guide sheet comprises a light exit region and a light mixing region... A light emitted by the light emitting unit enters the light mixing region, and exits from the light exit region
Implementation Method 2
The film comprises a first zone and a second zone. A transmittance of the first zone is greater than a transmittance of the second zone... effective shielding of stray light
Data Source
AI summary
A light emitting module includes a base, a light guide sheet, a circuit board, a light emitting unit, and a film. The base includes a base plate and a first dam disposed on a side of the base plate. The light guide sheet is disposed on the base plate, and includes a light exit region and a light mixing region. The light exit region is adjacent to the first dam. At least a part of the circuit board is disposed on the light mixing region. The light emitting unit is disposed on a surface of the circuit board close to the light guide sheet. The film is disposed on the light guide sheet and the circuit board, and includes a first zone and a second zone. A transmittance of the first zone is greater than a transmittance of the second zone.