LCD Electrode Etching Preventing Undercut Formation
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Solution Overview
Problem
Liquid crystal displays face challenges in preventing undercut formation below the common electrode during the etching process of the common and auxiliary electrodes, which affects the manufacturing process and the display's performance.
Innovation Solution
A method for manufacturing a liquid crystal display that involves forming a conductive metal pattern with varying thickness regions using photosensitive film patterns as masks, allowing for independent etching of the common and auxiliary electrodes while preventing undercut formation by using different etchants and carefully structuring the electrode layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If independent etching of common electrode and auxiliary electrode is performed, then manufacturing precision is improved, but undercut formation occurs below the common electrode
Solution Approach 1:
The patent introduces a conductive metal layer as an intermediary between the conductive material layer and the photosensitive film pattern. This conductive metal layer acts as a protective mask during the etching process, preventing the etchant from directly attacking the conductive material layer and causing undercut formation, while still allowing precise pattern transfer for independent electrode etching.
Solution Approach 2:
The conductive metal layer is formed in advance before the etching process, creating a protective barrier that prevents undercut formation during subsequent etching operations. This preliminary protective layer ensures that the etchant only removes material where intended, maintaining manufacturing precision without causing harmful undercut effects.
2Manufacturing precision
If thicker photosensitive film pattern is used for masking, then etching precision is improved, but aperture ratio is reduced
Solution Approach 1:
The patent segments the masking function into two separate layers: the photosensitive film pattern provides the initial pattern definition, while the conductive metal layer provides the thick protective mask for etching. This segmentation allows the photosensitive film to be thin (preserving aperture ratio) while the conductive metal layer provides the necessary thickness for precise etching control.
Solution Approach 2:
The solution moves from relying solely on the vertical thickness of a single photosensitive film layer to a two-layer structure where the conductive metal layer adds another dimensional layer for masking. This dimensional change allows precise etching protection without requiring the photosensitive film to be excessively thick, thus maintaining aperture ratio.
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 method effectively prevents undercut formation, enhancing the manufacturing process and improving the display's performance by reducing the time required to stabilize the common voltage and maintaining the aperture ratio.
Implementation Method 1
forming a first photosensitive film pattern on the conductive metal layer, the first photosensitive film pattern comprising a first region having a first thickness and a second region having a second thickness greater than the first thickness
Implementation Method 2
forming a conductive metal pattern through a wet etching by using the first photosensitive film pattern as a mask
Data Source
AI summary
A method for manufacturing a liquid crystal display, including: preparing a substrate on which a switching element, laminating a conductive material layer and a conductive metal layer, forming a first photosensitive film pattern on the conductive metal layer, the first photosensitive film pattern comprising a first region having a first thickness and a second region having a second thickness greater than the first thickness, forming a conductive metal pattern by etching the conductive metal layer using the first photosensitive film pattern as a mask, forming a second photosensitive film pattern that exposes a part of the conductive metal pattern by removing the first region of the first photosensitive film pattern, forming a common electrode by etching the conductive material layer by using the conductive metal pattern as a mask and forming an auxiliary electrode by etching the exposed conductive metal pattern using the second photosensitive film pattern as a mask.