Micro LED Light-Emitting Module With Diffuser for Brightness Uniformity
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Solution Overview
Problem
Conventional micro LED displays experience brightness differences between regions due to variations in light emitting modules, leading to inconsistent image quality.
Innovation Solution
A light emitting module design featuring a circuit board with unit pixels covered by a molding member and an anti-glare layer, where the molding member includes a diffuser and a black molding member, and an anti-glare layer with a base, hard coating, and adhesive, ensuring uniform thickness and brightness across the module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple light emitting modules are used to cover the display area, then the display area can be adequately covered, but brightness differences occur between regions and modules
Solution Approach 1:
The display is divided into multiple light emitting modules, each containing multiple unit pixels. This segmentation allows for manageable assembly and replacement while maintaining overall display functionality. The circuit board is divided into multiple regions, each corresponding to a light emitting module, enabling modular construction.
Solution Approach 2:
A diffuser is selectively applied to the molding member at specific locations (corners and/or edges) of the circuit board to address local brightness variations. The diffuser is positioned in regions where light distribution needs improvement, creating non-uniform local modification to achieve global uniformity. The molding member itself may have varying thickness or composition in different regions to control light extraction locally.
2Area of stationary object
If micro LEDs are transferred to a small circuit board, then the module size is reduced for easier mounting, but brightness uniformity across the module becomes difficult to control
Solution Approach 1:
The solution moves from controlling brightness uniformity in the planar dimension (across the small circuit board) to the vertical dimension (thickness of the molding member). By varying the thickness of the molding member or the position of the diffuser in the vertical direction, light distribution is controlled through optical path length differences, achieving uniformity without increasing board size.
Solution Approach 2:
The diffuser acts as an intermediary element between the micro LEDs and the external environment. It mediates the light output from the LEDs, scattering and redistributing the light to achieve uniform brightness. The molding member serves as another intermediary, providing structural support and additional optical control through its thickness and material 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
The solution reduces brightness differences between regions and modules, resulting in consistent image quality and uniform brightness across the display screen.
Implementation Method 1
the molding member includes a diffuser containing molding member
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A light-emitting module according to one embodiment of the present disclosure comprises a circuit board, a plurality of unit pixels arranged on the circuit board, a molding unit for covering the plurality of unit pixels, and an anti-glare layer arranged on the molding unit, wherein the molding unit includes a molding unit containing a dispersing-agent.