Light Emitting Module Inclined Reflection Unit Uniformity
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Solution Overview
Problem
Direct-type backlight units in large-sized display apparatuses suffer from reduced light uniformity due to differences in brightness at the edge and center of the diffusion plate, caused by the angle of inclination of the reflection plate differing from the beam angle of the light emitting diodes, leading to the Mura phenomenon and increased bezel size.
Innovation Solution
Incorporating a reflection unit with specific patterns, such as blind holes or through holes, between the board and the optical member, where the patterns are inclined to match the beam angle of the light source units, ensuring uniform light distribution and reducing the thickness of the module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a reflection plate is positioned to reflect light exiting from the lateral side of the light emitting device, then light can be redirected to the upper side, but light uniformity deteriorates due to mismatch between beam angle and reflection plate angle
Solution Approach 1:
The reflection plate is divided into multiple regions (first reflection region, second reflection region, third reflection region) with different reflectivity characteristics. Each region is positioned to receive light at specific angles and reflect it appropriately, creating local variations in optical properties that collectively achieve uniform light distribution across the diffusion plate.
Solution Approach 2:
The reflection plate is segmented into distinct functional zones with different orientations and reflectivities. The first reflection region has a first angle of inclination, the second has a second angle, and the third has a third angle, allowing each segment to handle specific light paths independently and collectively achieve uniform illumination.
2Ease of operation
If the beam angle of light emitted from the light emitting device is different from the angle of inclination of the reflection plate, then light can be reflected, but brightness uniformity at edge and center deteriorates
Solution Approach 1:
Different regions of the reflection plate have different local properties (angles of inclination and reflectivity) matched to the specific light paths they receive. The first reflection region is optimized for light from the first light emitting device, the second region for the second light emitting device, and so on, ensuring each region redirects light uniformly without creating brightness variations.
3Ease of manufacture
If patterns are formed on the reflection unit by punching, then manufacturing is simplified and cost is reduced, but structural complexity may increase
Solution Approach 1:
The reflectivity parameter of the reflection plate is varied across different regions to achieve the desired optical performance. By controlling the reflectivity of each region (first reflection region, second reflection region, third reflection region) differently, the patent achieves uniform light distribution while maintaining a relatively simple overall structure that can be manufactured by punching.
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 improves light uniformity, reduces the Mura phenomenon, allows for a thinner module, and simplifies manufacturing by punching patterns, while maintaining or reducing power consumption and potentially eliminating the bezel, thus enhancing the efficiency and cost-effectiveness of the light emitting module.
Implementation Method 1
a reflection unit located between the board and the optical member in an inclined state beside at least one light source unit
Data Source
AI summary
A light emitting module may include a board, at least one light source unit provided on the board, an optical member provided on the at least one light source unit, and a reflection unit provided between the board and the optical member in an inclined state beside at least one light source unit. The reflection unit may be provided closer to the optical member than to the board and may include a pattern having lower reflectance than other constructions of the light emitting module.