Conductive Nanowire Antistatic Layer for LCD Passivation
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Solution Overview
Problem
Plane-to-line switching mode LCD devices face issues with static electricity due to electrode formation on one substrate, leading to increased manufacturing costs and defects from exposed antistatic layers without passivation, especially when using indium-tin-oxide (ITO) for antistatic layers which differ from pixel and common electrodes.
Innovation Solution
An antistatic layer using conductive nanowires is introduced, protected by an overcoat layer and passivation film, reducing manufacturing costs and preventing scratches, with the nanowires formed from materials like gold, silver, or copper, and polymer materials like poly(3,4-etylenedioxythiophene) for improved conductivity and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ITO antistatic layer is deposited on the back side of the opposite substrate, then antistatic properties are improved, but manufacturing costs increase due to additional manufacturing processes
Solution Approach 1:
The patent combines the antistatic function with the passivation layer by incorporating conductive particles into the passivation layer material. This merging eliminates the need for a separate ITO antistatic layer, reducing manufacturing steps and costs while maintaining both passivation and antistatic properties in a single layer.
Solution Approach 2:
The passivation layer is given multiple functions: it provides both electrical insulation (passivation) and antistatic properties through the inclusion of conductive particles. This multi-functionality reduces the total number of layers needed and simplifies the manufacturing process.
2Ease of manufacture
If an ITO antistatic layer is deposited without a passivation layer, then manufacturing costs are reduced, but the surface is exposed and susceptible to scratches and defects
Solution Approach 1:
The patent merges the protection function (passivation) with the antistatic function in a single layer. The passivation layer containing conductive particles provides both scratch protection and antistatic properties, eliminating the need for separate layers and ensuring surface durability.
Solution Approach 2:
The passivation layer is formulated as a composite material combining insulating polymer matrix with conductive particles dispersed throughout. This composite structure provides both the protective characteristics of the polymer and the electrical conductivity needed for antistatic properties.
3Device complexity
If electrodes are formed on only one substrate in PLS mode, then device structure is simplified, but static electricity occurs due to electric field generation
Solution Approach 1:
The patent extracts the antistatic function from the traditional electrode structure and incorporates it into the passivation layer. By placing conductive particles in the passivation layer on the opposite substrate, it dissipates static electricity without requiring additional electrodes or complicating the PLS mode electrode structure.
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
The conductive nanowire antistatic layer enhances electrical conductivity, reduces surface resistivity, and protects against scratches, thereby lowering manufacturing costs and defect rates while maintaining effective antistatic properties.
Implementation Method 1
the antistatic layer includes conductive nanowire
Implementation Method 2
protected by an overcoat layer and passivation film, reducing manufacturing costs and preventing scratches
Data Source
AI summary
Disclosed is a liquid crystal display panel which includes a first substrate, a thin film transistor array comprising at least one thin film transistor formed on a first surface of the first substrate, and a second substrate having a first surface facing the first substrate, the second substrate including an antistatic layer on a surface opposite the first surface of the second substrate. Liquid crystal molecules are positioned between the first surface of the first substrate and the first surface of the second substrate, wherein the antistatic layer includes conductive nanowire.