LCD Pad Openings via Single-Step Etching
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Solution Overview
Problem
The manufacturing process of liquid crystal display (LCD) devices is complicated due to the need for multiple etching and patterning steps to form contact holes and pad open regions, which increases the number of processing steps and complexity.
Innovation Solution
The process is simplified by patterning the overcoat layer, passivation layer, and gate insulation layer in a single step, reducing the number of processing steps and improving manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple etching and patterning steps are used to form contact holes and pad open regions, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple etching and patterning steps into a single integrated process. The method forms contact holes and pad open regions simultaneously by using a unified patterning approach where the gate and data pads are defined in one step, eliminating the need for separate etching processes that would otherwise be required to create these features at different locations and orientations.
Solution Approach 2:
The patent employs a universal patterning process that serves multiple functions: it defines the gate pads, data pads, contact holes, and alignment features all in a single operation. This multi-functional approach replaces what would traditionally require multiple specialized steps, each optimized for a specific feature type, thereby reducing overall process complexity while maintaining precision.
2Manufacturing precision
If multiple masks are used for patterning, then the manufacturing precision is improved, but the productivity decreases
Solution Approach 1:
The patent merges multiple mask-based patterning operations into a single mask step. By designing the patterning process to simultaneously define all pad regions and contact hole locations in one exposure and development cycle, the method eliminates the sequential application of multiple masks, thereby maintaining patterning accuracy while significantly improving manufacturing throughput.
3Manufacturing precision
If multiple processing steps are used, then the manufacturing precision is improved, but the loss of time increases
Solution Approach 1:
The patent performs preliminary patterning of all pad regions and contact hole locations in a single initial step, before subsequent processing steps are applied. This preliminary action establishes the complete geometric framework for the device in one operation, eliminating the need for repeated patterning and etching steps that would otherwise be required to define these features at different stages of manufacturing.
Data Source
AI summary
An LCD device and a method for manufacturing the same is disclosed in which the manufacturing process is simplified by etching an overcoat layer and a lower insulating layer at the same time. Disclosed is a method for manufacturing the LCD device that includes forming a thin film transistor (TFT) on an active region of a substrate, forming a gate pad region and data pad region, and forming a passivation layer on the entire surface of the substrate. The manufacturing method further includes forming an overcoat layer and selectively etching the overcoat layer. Contact holes for the pixel electrode, the gate pad, and the data pad are formed by selectively etching the overcoat layer, the passivation layer, and the gate insulating layer though one process.