PDP Front Electrode Fine Line Formation via Layered Paste
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Solution Overview
Problem
Conventional methods for forming fine lines in plasma display panel (PDP) front electrodes often result in undercut during light exposure, leading to pattern inversion and potential peeling off from the substrate due to insufficient light energy reaching the base of the photosensitive paste.
Innovation Solution
A method involving the application of a black paste with specific inorganic powders and a white paste, both containing photopolymerizable monomers, is used to form a front electrode. The black paste includes glass powder, black pigment, and optionally conductive metal powder, while the white paste contains glass powder and conductive metal powder, with controlled surface areas and ratios to ensure proper light distribution and polymerization, thereby minimizing undercut and achieving fine line formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photosensitive conductive paste is used to form fine lines, then fine electrode lines can be formed, but undercut occurs during light exposure causing pattern inversion and potential peeling
Solution Approach 1:
The photosensitive paste is divided into multiple layers: a lower paste layer containing inorganic powder and photopolymerizable monomer, and an upper paste layer containing the same components but with different thickness and properties. This segmentation allows the lower layer to provide strong adhesion to the substrate while the upper layer forms the fine pattern, resolving the contradiction between fine line formation and pattern adhesion.
Solution Approach 2:
Different regions of the paste structure are given different properties: the lower paste layer has higher inorganic powder content and thickness for adhesion, while the upper paste layer has optimized composition for light exposure and fine pattern formation. This local differentiation enables simultaneous achievement of fine line precision and pattern stability.
2Manufacturing precision
If conventional photosensitive paste composition is used, then fine lines can be formed, but light energy is insufficient to reach the base of the paste causing undercut
Solution Approach 1:
The paste is segmented into upper and lower layers with different thicknesses and compositions. The lower layer is thinner and has optimized light transmission properties to allow light energy to reach deep into the structure, while the upper layer provides the fine pattern definition. This resolves the contradiction between line width control and light energy penetration.
Solution Approach 2:
The composition parameters of the paste are changed: the lower paste layer contains photopolymerizable monomer and inorganic powder in specific ratios, and the upper paste layer has different composition. These parameter changes optimize light penetration depth while maintaining fine line formation capability.
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 allows for the formation of a fine PDP electrode with reduced undercut, ensuring the pattern adheres well to the substrate and maintains excellent appearance and conductivity, effectively addressing the issue of pattern inversion and peeling.
Implementation Method 1
both containing photopolymerizable monomers, is used to form a front electrode... exposing and developing the dried black paste and the dried white paste
Data Source
AI summary
A method is disclosed for forming a PDP front electrode by applying a particular type of photopolymerizable black paste, drying the black paste, and applying a particular type of photopolymerizable white paste on top of the dried black paste.