Display Device Barcode Alignment via Laser Ablation
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Solution Overview
Problem
Existing display devices face challenges in reducing defect rates during the formation of barcode patterns, which affects the reliability of both the devices and their manufacturing processes.
Innovation Solution
A display device design featuring an alignment pattern with a barcode pattern, where the alignment pattern provides a reference point for forming the barcode, using a base layer, circuit pattern, and cover layers with specific openings to expose the alignment pattern, allowing for accurate barcode pattern formation through laser irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a barcode pattern is formed on a circuit board without an alignment pattern, then the manufacturing process is simpler, but the defect rate of the barcode pattern increases
Solution Approach 1:
The alignment pattern is formed on the base layer before the barcode pattern formation process. This preliminary structure serves as a reference for subsequent barcode positioning, ensuring high precision without complicating the overall manufacturing flow. The alignment pattern includes specific geometric features (such as L-shaped patterns or circular patterns with notches) that enable accurate positioning of the barcode pattern during laser irradiation or printing processes.
Solution Approach 2:
The alignment pattern acts as an intermediary element between the base layer and the barcode pattern. It provides a stable reference framework that mediates the positioning process, allowing the barcode pattern to be accurately formed relative to the circuit board features without direct measurement complexities.
2Measurement precision
If the alignment pattern is exposed through openings in cover layers, then the barcode pattern can be accurately formed, but the manufacturing process becomes more complex
Solution Approach 1:
The cover layers are designed with specific openings (first opening and second opening) that segment the cover structure to expose the alignment pattern at precise locations. These openings are strategically positioned and shaped (such as rectangular or circular openings) to reveal only the necessary portions of the alignment pattern, enabling accurate measurement and barcode formation while maintaining the protective function of the cover layers.
Solution Approach 2:
The cover layers exhibit local quality variations through the openings, which are specifically positioned and sized to expose the alignment pattern only where needed. The openings are designed with specific dimensions and shapes (such as 100μm x 100μm square openings or circular openings with 50μm diameter) to provide optimal visibility of the alignment pattern features while minimizing unnecessary exposure and maintaining overall structural integrity.
3Reliability
If multiple cover layers are used to protect the circuit pattern, then the circuit board is better protected, but the alignment pattern accessibility is reduced
Solution Approach 1:
The circuit board employs a nested multi-layer structure where the base layer contains the alignment pattern, the first cover layer protects the circuit pattern while having a first opening to expose the alignment pattern, and the second cover layer provides additional protection with a second opening aligned with the first opening. This nested arrangement allows the alignment pattern to be detected through the openings in both cover layers, maintaining both protection and detectability.
Solution Approach 2:
The alignment pattern is designed to be detectable through the cover layers by utilizing optical properties and geometric configurations. The openings in the cover layers are positioned and sized to allow light or detection signals to reach the alignment pattern and return, enabling detection in the vertical dimension through the multi-layer structure without requiring removal of the protective cover layers.
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 approach reduces the defect rate of the barcode pattern and enhances the reliability of the display device and its manufacturing process by providing a precise reference point for barcode formation.
Implementation Method 1
The barcode pattern may be formed by irradiating a laser beam onto the second cover layer
Data Source
AI summary
A display device includes: a display panel and a circuit board. The circuit board includes a base layer, a circuit pattern disposed on the base layer and electrically connected to the display panel, an alignment pattern disposed on the base layer and including the same material as the circuit pattern, a first cover layer disposed on the base layer, covering the circuit pattern, and provided with a first opening defined therethrough to expose the alignment pattern, and a second cover layer disposed on the first cover layer, provided with a second opening defined therethrough and overlapping the first opening, and including a barcode pattern defined on a surface of the second cover layer opposite to the first cover layer. The first cover layer overlapping the second opening is exposed through the second opening without being covered by the second cover layer.