Conductive Sealant and Restraining Elements for LCD Panel
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Solution Overview
Problem
Conventional TFT-LCDs face issues with parasitic capacitance due to the thickness of organic passivation, require multiple dispensing processes for silver paste, and struggle with precise control of cell gaps, leading to reduced throughput and display mura.
Innovation Solution
An LCD panel design incorporating a conductive sealant and restraining elements, where the conductive sealant fills openings in a dielectric layer to connect common lines and electrodes, eliminating the need for silver paste and improving gap control with L-shaped or arc-shaped restraining elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver paste is dispensed to electrically connect transfer pads and common electrode, then electrical connectivity is achieved, but throughput is reduced and cell gap control precision deteriorates
Solution Approach 1:
The patent combines the electrical connection function and the sealing function into a single conductive sealant material. This sealant simultaneously provides electrical connectivity between transfer pads and common electrode, and seals the liquid crystal layer, eliminating the need for separate silver paste dispensing process and improving throughput
Solution Approach 2:
The conductive sealant serves multiple functions: electrical connection, sealing, and structural support. By making the sealant multi-functional, the patent eliminates the need for separate silver paste, thereby reducing process steps and improving productivity while maintaining reliability
2Reliability
If silver paste is dispensed for electrical connection, then connectivity is established, but cell gap control precision deteriorates causing display mura
Solution Approach 1:
By merging the sealing and electrical connection functions into one conductive sealant layer, the patent ensures uniform thickness and precise cell gap control. The sealant naturally conforms to the substrate surfaces, providing consistent gap control without the disruptions caused by separate silver paste dispensing
Solution Approach 2:
The patent changes the physical state and properties of the sealing material from a solid paste (silver paste) to a viscoelastic sealant that can flow and conform. This parameter change enables better adaptation to substrate surface variations, improving cell gap uniformity and eliminating display mura
3Reliability
If multiple dispensing processes are used for sealant and silver paste, then electrical connection and sealing are achieved, but manufacturing complexity increases
Solution Approach 1:
The patent merges two separate dispensing processes (sealant dispensing and silver paste dispensing) into a single conductive sealant dispensing process. This reduces manufacturing complexity by eliminating the need for multiple precision alignment and dispensing operations while achieving both electrical connection and sealing functions
Data Source
AI summary
A LCD panel including an active device array substrate, an opposite substrate, a liquid crystal layer, a conductive sealant and restraining elements is provided. The active device array substrate includes common lines, transfer pads and a dielectric layer. The dielectric layer has openings exposing the transfer pads. The opposite substrate has a common electrode. The liquid crystal layer and the conductive sealant are disposed between the active device array substrate and the opposite substrate. The conductive sealant surrounds the liquid crystal layer. The openings are corresponding to corners of the conductive sealant. The conductive sealant fills the openings and the common electrode is electrically connected to the transfer pads through the conductive sealant. Further, the restraining elements are between the active device array substrate and the opposite substrate and are distributed around the corners of the conductive sealant such that the conductive sealant is forced to fill into the openings.