LED Display PCB Filling Structure for Light Reflection Suppression
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Solution Overview
Problem
Conductive patterns on printed circuit boards in LED displays are exposed, leading to light reflection and interference, affecting image quality.
Innovation Solution
A display module design featuring a printed circuit board with a protruding structure and a filling layer of opaque non-conductive material to cover the conductive patterns, ensuring they are not exposed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive patterns are left exposed on the printed circuit board, then electrical connection is maintained, but light reflection and interference occur affecting image quality
Solution Approach 1:
A black matrix layer is introduced as an intermediary substance between the conductive patterns and the external environment. This layer selectively absorbs light to prevent reflection and interference while allowing electrical signals to pass through to the light emitting elements, thus resolving the contradiction between maintaining electrical connection and eliminating optical interference
Solution Approach 2:
The conductive patterns are coated with a black matrix layer that changes the optical properties of the exposed conductive areas. The black color absorbs light and prevents reflection, transforming the harmful reflective property of the conductive patterns into a non-reflective surface while preserving electrical conductivity
2Object-affected harmful factors
If a filling layer is added to cover conductive patterns, then light reflection is prevented, but manufacturing complexity increases
Solution Approach 1:
The black matrix layer is merged with the existing printed circuit board structure and conductive patterns into a single integrated assembly. By combining the coverage function with the existing electrical connection structure, the solution prevents light reflection without requiring a completely separate and complex filling system
Solution Approach 2:
The material properties of the black matrix layer are optimized to achieve the desired optical absorption characteristics while maintaining ease of application. By carefully selecting materials and parameters such as opacity, adhesion, and thickness, the manufacturing process remains relatively simple while effectively preventing light reflection
Data Source
AI summary
A display module includes a printed circuit board having a conductive pattern formed thereon, a plurality of light emitting elements arranged on the printed circuit board, and electrically connected to the conductive pattern, and a filling layer including an opaque non-conductive material, wherein the printed circuit board comprises a protruding structure disposed in an outer region of the printed circuit board between outermost ones of the light emitting elements and an edge of the printed circuit board, wherein the height of the protruding structure is greater than the height of the conductive pattern, wherein the filling layer is disposed between the plurality of light emitting elements and between the outermost light emitting elements and the protruding structure to cover the conductive pattern.