Line On Glass LCD Parallel OLB and LOG Structure
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Solution Overview
Problem
The Line On Glass (LOG) type liquid crystal display devices face challenges in reducing the resistance of driving unit lines and preventing corrosion and external scratches, which can lead to broken faults in the driving unit lines.
Innovation Solution
The implementation of a dual-line structure for Outer Lead Bonding (OLB) lines and Line On Glasses (LOGs) with a molybdenum-based data conductive layer deposited on an aluminum-based gate conductive layer, along with a parallel structure and specific contact hole arrangements in Flexible Printed Circuit (FPC) pads and input bumpers, enhances the connection between conductive layers and improves durability against corrosion and scratches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single conductive layer is used for driving unit lines, then the structure is simple and fabrication is easier, but the resistance is high and the line is vulnerable to corrosion and scratches
Solution Approach 1:
The patent applies composite materials by forming a dual-layer conductive structure where a first conductive layer (e.g., aluminum-based) and a second conductive layer (e.g., molybdenum-based) are deposited sequentially. The first layer provides low resistance for signal transmission, while the second layer provides corrosion resistance and scratch protection. This composite structure resolves the contradiction by combining materials with complementary properties to simultaneously improve reliability and maintain structural simplicity.
Solution Approach 2:
The patent segments the single conductive layer into two distinct functional layers. The first conductive layer is optimized for electrical conductivity (low resistance), while the second conductive layer is optimized for protection (corrosion and scratch resistance). This segmentation allows each layer to perform its specific function efficiently, resolving the contradiction between simplicity and reliability by distributing functions across multiple layers.
2Ease of operation
If the driving unit line is exposed to external environment, then the connection to external circuits is enabled, but the line becomes vulnerable to corrosion and external scratches
Solution Approach 1:
The patent implements beforehand cushioning by depositing the second conductive layer (e.g., molybdenum-based) over the first conductive layer (e.g., aluminum-based) that is exposed to the external environment. This second layer acts as a protective barrier that cushions the exposed line against corrosion and scratches while maintaining electrical connectivity. The protective layer is applied in advance before the line is subjected to environmental stress, preventing harmful effects rather than remedying them later.
3Reliability
If a dual-line structure with two conductive layers is used, then the resistance decreases and protection against corrosion and scratches is improved, but the fabrication process becomes more complex
Solution Approach 1:
The patent merges multiple functions into a unified dual-layer structure that is formed through a single integrated fabrication process. Both conductive layers are deposited sequentially in one manufacturing run, and the pattern formation for both layers is combined in the photolithography and etching steps. This merging approach reduces the overall fabrication complexity compared to forming separate layers in distinct processes, while still achieving the benefits of reduced resistance and improved protection.
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 configuration decreases the resistance of the driving unit lines and maintains signal functionality even if one conductive layer is broken due to corrosion or external scratches, improving the overall quality and reliability of the LCD device.
Implementation Method 1
a molybdenum-based data conductive layer deposited on an aluminum-based gate conductive layer
Data Source
AI summary
In a Line On Glass (LOG) type Liquid Crystal Display (LCD) device and a method of fabricating the same, LOGs and Outer Lead Bonding (OLB) lines are designed in a parallel structure, and a structure of contact holes within Flexible Printed Circuit (FPC) pads and bumpers of Integrated Circuits (ICs) changes, so as to prevent a broken fault due to corrosion and scratch, resulting in improvement of quality of an image displayed on the LCD device.