Organic Insulating Film Holes for LCD Trace Reliability
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Solution Overview
Problem
In liquid crystal display devices, the proximity of gate driver circuits to the sealing member in a narrow frame configuration makes them susceptible to moisture, leading to ion migration and short circuits due to high trace density, which compromises operation reliability.
Innovation Solution
Incorporating an organic insulating film with holes over the crossing portions of traces in the circuit, which reduces the likelihood of ion migration by minimizing moisture exposure and absorption, thereby enhancing the reliability of the circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the circuit section is arranged in the non-display area closer to the sealing member to reduce frame size, then the frame width is reduced, but the circuit section becomes more susceptible to moisture leading to ion migration and short circuits
Solution Approach 1:
The patent applies local quality by forming holes in the organic insulating film specifically at crossing portions of traces where ion migration is most likely to occur. This localized modification allows the insulating film to maintain its moisture barrier function in most areas while providing enhanced protection at critical crossing points where electric fields are strongest and ion migration risk is highest.
Solution Approach 2:
The patent introduces a porous structure (holes) in the organic insulating film at specific locations. These holes are filled with inorganic insulating material to create a composite structure that provides both the flexibility and adhesion of organic materials and the moisture resistance and ion migration barrier properties of inorganic materials at critical crossing portions.
2Measurement precision
If the trace distribution density is increased to improve display definition, then the display quality is improved, but the likelihood of ion migration between crossing traces increases
Solution Approach 1:
The patent applies local quality by forming holes in the organic insulating film specifically at crossing portions of traces where ion migration is most likely to occur. This localized modification allows the insulating film to maintain its moisture barrier function in most areas while providing enhanced protection at critical crossing points where electric fields are strongest and ion migration risk is highest.
Solution Approach 2:
The patent creates a composite structure by combining organic insulating film with inorganic insulating material filled in holes. This composite approach leverages the advantages of both materials: the organic film provides flexibility and adhesion, while the inorganic material provides superior moisture resistance and ion migration barrier properties at trace crossing portions.
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 configuration effectively reduces ion migration and short circuits, improving the operational reliability of the liquid crystal display device, especially in narrow frame designs with high trace density.
Implementation Method 1
The organic insulating film is made of organic resin. The organic resin tends to absorb moisture.
Data Source
AI summary
A liquid crystal panel includes an array substrate, a row control circuit, a first trace, a second trace, a gate insulating film, and an organic insulating film. The array substrate 11b includes a display area and a non-display area. The row control circuit is arranged in the non-display area. The first trace is a component of the row control circuit. The second trace is a component of the row control circuit and arranged over the first trace so as to cross the first trace. The gate insulating film is arranged between the first trace and the second trace. The organic insulating film includes a hole formed in an area that overlaps at least crossing portions of the first trace and the second trace. The organic insulating film is made of organic resin.