FFS LCD Interlayer Resin Film Covers TFT Channels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fringe field switching (FFS) mode liquid crystal display devices face issues with misalignment of liquid crystal molecules due to potential differences between signal lines and pixel electrodes, leading to reduced aperture ratio and display quality, along with increased manufacturing costs and variability in thin film transistor (TFT) characteristics due to complex layered structures and exposure to chemical solutions.
Innovation Solution
A simplified structure for FFS mode liquid crystal display devices is implemented, where the channel regions of TFTs are directly covered with an interlayer resin film and a second insulating film, eliminating the need for a passivation film and reducing exposure to chemical solutions, thereby ensuring moisture resistance and stable operation while maintaining high aperture ratio and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a passivation film is formed to cover TFT channel regions, then moisture resistance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the passivation film function with the interlayer resin film by having the interlayer resin film directly cover the TFT channel regions. This merging eliminates the need for a separate passivation film layer, reducing device complexity while maintaining moisture resistance through the interlayer resin film's protective coverage.
Solution Approach 2:
The interlayer resin film is given multiple functions: it serves as both the structural interlayer component and the protective passivation layer for TFT channel regions. This multi-functionality reduces the total number of layers needed while ensuring moisture resistance is maintained.
2Reliability
If multiple insulating films and passivation films are layered, then moisture resistance is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent merges the passivation function into the interlayer resin film structure, eliminating the need for separate passivation film deposition processes. This reduces manufacturing steps and associated costs while maintaining the protective function against moisture.
Solution Approach 2:
The patent extracts the passivation function from the traditional multi-layer structure and integrates it into the interlayer resin film, simplifying the manufacturing process by reducing the number of separate film deposition steps required.
3Area of moving object
If channel regions are exposed to chemical solutions during manufacturing, then aperture ratio is improved, but TFT characteristic variation increases
Solution Approach 1:
The patent applies the interlayer resin film to cover the TFT channel regions before subsequent manufacturing steps that involve chemical solutions. This preliminary protective action prevents chemical exposure to the channel regions, reducing TFT characteristic variation while allowing aperture optimization.
Solution Approach 2:
The interlayer resin film serves as a protective cushioning layer that shields the TFT channel regions from harmful chemical solutions during manufacturing processes. This beforehand protection ensures stable TFT characteristics by preventing chemical contamination and damage.
4Device complexity
If interlayer resin film directly covers TFT channel regions, then device complexity is reduced, but moisture resistance may be compromised
Solution Approach 1:
The patent merges the protective passivation function with the interlayer resin film, allowing the single interlayer resin film structure to provide both structural support and moisture protection for TFT channel regions, eliminating the need for additional passivation layers.
Solution Approach 2:
The patent modifies the parameters of the interlayer resin film (such as thickness, material composition, or deposition conditions) to ensure it provides adequate moisture resistance while directly covering the TFT channel regions, eliminating the need for separate passivation layers.
Data Source
AI summary
A liquid crystal display includes an interlayer resin film covering a surface of the display area including thin film transistors, first electrodes formed of transparent conductive material on the surface of the interlayer resin film in regions defined by scan and signal lines and electrically connected to the thin film transistors. A second insulating film formed on the surface of the interlayer resin film includes the first electrodes and second electrodes formed of transparent conductive material on the second insulating film, the second electrodes having slits defined at the scan lines and signal lines. A circuit including thin film transistors with exposed channel regions is on the display area's periphery. The interlayer resin film directly covers the thin film transistors' channel regions in the display area and the peripheral area; and the surface of the display area's and peripheral circuit's interlayer resin films are covered with the second insulating film.