Display Panel Conductive Protrusion Cell Gap Uniformity
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Solution Overview
Problem
The aggregation of conductive particles in liquid crystal display panels leads to non-uniformity in the cell gap between substrates, affecting the quality and performance of the display panel, especially when larger amounts of conductive material are used.
Innovation Solution
A display panel design that incorporates conductive protrusions to reduce the amount of conductive composite material required for electrical connection between substrates, using a first and second conductive protrusion made of different materials, which are stacked to bridge the gap and are in contact with the conductive layers, thereby minimizing the aggregation of conductive particles and maintaining a uniform cell gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive particles are added to adhesive to form conductive material between substrates, then electrical connection between substrates is achieved, but the particles aggregate causing non-uniformity in cell gap
Solution Approach 1:
The conductive material is divided into multiple discrete conductive particles dispersed within the adhesive matrix, rather than using a continuous conductive layer. This segmentation prevents aggregation while maintaining electrical connectivity through percolation pathways between particles.
Solution Approach 2:
The conductive particles are selectively concentrated at specific locations where electrical connection is needed (at the edges and corners of the display panel), while the center regions use less conductive material. This local concentration achieves electrical connectivity without excessive particle aggregation that would cause cell gap non-uniformity.
2Reliability
If greater amounts of conductive material are used to bridge cell gap, then electrical connection is improved, but particle aggregation increases causing more non-uniformity
Solution Approach 1:
The adhesive composition is tailored locally: edges and corners contain adhesive with higher conductive particle concentration for reliable electrical connection, while the center region uses adhesive with lower particle concentration to minimize aggregation and maintain cell gap uniformity.
Solution Approach 2:
Instead of uniformly distributing conductive particles throughout the entire adhesive layer, the invention applies conductive particles only where necessary (partial action) at the edges and corners, avoiding excessive particle usage that would cause aggregation and cell gap non-uniformity in the center region.
Data Source
AI summary
A display panel includes a first substrate, a second substrate, a display medium layer, a sealant and a conductor. The first and second substrates are assembled via the sealant that surrounds the display medium layer disposed between the first and second substrates. The second substrate includes a second conductive layer and a passivation layer disposed on the second conductive layer. The passivation layer reveals a portion of the second conductive layer. The conductor electrically connects a first conductive layer of the first substrate to the revealed portion of the second conductive layer and is disposed between the sealant and an edge of the display panel. A first conductive protrusion and a second conductive protrusion are sequentially disposed on one of the first and second substrates to form the conductor. A material of the second conductive protrusion may be formed from a conductive composite material, that may include a curable material.