Liquid Crystal Display Common Electrode Lateral Contact
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Solution Overview
Problem
The manufacturing process of liquid crystal display panels of the horizontal electric field type is complex and costly due to the requirement of multiple mask processes in forming the thin film transistor array substrate.
Innovation Solution
A method of forming a liquid crystal display device using a single mask process to create a thin film transistor, pixel electrode, and common electrode, with a conductive pattern in contact with the common electrode at its lateral side surface, simplifying the process and reducing costs by using three mask processes for the entire substrate formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple mask processes are used to form the thin film transistor array substrate, then the manufacturing precision and structural complexity are improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines multiple mask processes into a single mask process by integrating the formation of the common electrode and conductive patterns into the same photolithography step. This merging reduces the number of separate manufacturing steps while maintaining the required pattern precision, directly addressing the contradiction between manufacturing precision and process complexity
Solution Approach 2:
The single mask process serves multiple functions: it defines the common electrode pattern, creates the conductive pattern, and establishes the pixel electrode structure simultaneously. This multi-functionality allows one process step to achieve what previously required multiple separate steps, reducing overall device complexity while maintaining precision
2Stability of the object's composition
If multiple mask processes are used to form the thin film transistor array substrate, then the structural completeness is improved, but the productivity and manufacturing cost decrease
Solution Approach 1:
By merging the formation of multiple substrate components into a single mask process, the patent reduces the total number of manufacturing steps. This increases productivity by eliminating intermediate steps while maintaining complete substrate structure through the integrated pattern design
Solution Approach 2:
The single mask process is designed to pre-establish all necessary patterns for the common electrode, conductive patterns, and pixel electrodes in one step. This preliminary action ensures structural completeness is achieved early in the manufacturing process, allowing subsequent steps to focus on material deposition and processing rather than pattern formation
3Ease of manufacture
If the common electrode is formed without lateral side surface contact, then the manufacturing process is simplified, but the reliability and picture quality deteriorate due to crystallization of transparent electrode material
Solution Approach 1:
The patent applies local quality by creating a specific geometric configuration where the conductive pattern contacts the common electrode only at its lateral side surface. This localized contact arrangement prevents crystallization of the transparent electrode material at critical interfaces while maintaining overall process simplicity through the single mask formation method
Solution Approach 2:
The conductive pattern serves as an intermediary element that mediates between the common electrode and other substrate components. By positioning this intermediary to contact only at the lateral side surface, the patent prevents direct interaction that would cause crystallization while maintaining electrical connectivity where needed
Data Source
AI summary
A liquid crystal display device is provided. The liquid crystal display device includes a gate line and a data line formed on a substrate; a thin film transistor formed at an intersection of the gate line and the data line; a pixel electrode connected to the thin film transistor; a common electrode substantially parallel to the pixel electrode; and a conductive pattern in contact with the common electrode at a lateral side surface of the common electrode.