Liquid Crystal Display Insulating Layer Segmentation for Visibility
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Solution Overview
Problem
Liquid crystal displays (LCDs) in In-Plane-Switching (IPS) mode face challenges in achieving wide-angle visibility due to degraded front visibility compared to side visibility, and existing methods do not effectively enhance interface characteristics to address this issue.
Innovation Solution
A method of forming a liquid crystal display that includes forming gate and common electrodes, a channel layer, an organic layer pattern exposing the channel layer, and an inorganic insulation layer, with the organic layer formed by spin coating and the inorganic layer by Chemical Vapor Deposition (CVD), to improve interface characteristics and reduce parasitic capacitance, thereby enhancing the display's aperture ratio and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional IPS mode LCD structure is used, then the display achieves wide-angle visibility, but front visibility is degraded compared to side visibility
Solution Approach 1:
The patent segments the insulating layer into two distinct parts: an organic insulating layer and an inorganic insulating layer. This segmentation allows each layer to perform its specific function optimally - the organic layer provides good interface characteristics with the channel layer, while the inorganic layer provides stable coverage and reduced parasitic capacitance, thereby resolving the visibility contradiction
Solution Approach 2:
The patent employs a composite insulating structure combining organic and inorganic materials. The organic insulating layer (first insulating layer) is formed to contact the channel layer, providing excellent interface characteristics. The inorganic insulating layer (second insulating layer) is formed over the organic layer to provide stable coverage. This composite approach enables both wide-angle and front visibility requirements to be met simultaneously
2Illumination intensity
If the aperture ratio is increased to improve display brightness, then more light can pass through, but parasitic capacitance increases affecting display performance
Solution Approach 1:
The composite insulating structure with the inorganic insulating layer provides stable electrical characteristics and reduced parasitic capacitance while maintaining high aperture ratio. The inorganic material's inherent stability compensates for the capacitance increase that would normally accompany larger aperture openings
Solution Approach 2:
The patent applies different insulating materials in different locations - the organic insulating layer is positioned where interface characteristics are critical (contacting the channel layer), while the inorganic insulating layer is positioned where stable coverage and capacitance control are needed (over the organic layer and in contact with the pixel electrode). This local differentiation resolves the aperture ratio versus parasitic capacitance contradiction
3Ease of manufacture
If a simpler single-layer insulating structure is used, then manufacturing is easier, but interface characteristics are degraded
Solution Approach 1:
The patent applies the organic insulating layer specifically where interface characteristics are most critical - directly contacting the channel layer. This localized application of organic material provides excellent interface properties without requiring the entire insulating structure to be complex, thus maintaining ease of manufacture while improving interface characteristics
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
The method improves the interface characteristics and aperture ratio of the liquid crystal display, reducing parasitic capacitance and stabilizing the thin film transistor, which enhances the display's ability to control liquid crystal molecule alignment and maintain wide-angle visibility.
Implementation Method 1
the organic layer may be formed by a spin coating process
Implementation Method 2
the inorganic insulation layer may be formed by a Chemical Vapor Deposition (CVD) process
Data Source
AI summary
A liquid crystal display and a method of forming the same are disclosed. The method of forming the liquid crystal display comprises: forming a gate electrode and a common electrode on a substrate; forming a gate dielectric, which covers the gate electrode and the common electrode, on the substrate; forming a channel layer, which covers the gate electrode, on the gate dielectric; forming a source electrode and a drain electrode which expose a portion of the channel layer; forming an organic layer, which contacts the exposed portion of the channel layer, on the source electrode and the drain electrode; patterning the organic layer contacting the channel layer so as to form an organic layer pattern comprising a first opening which exposes the channel layer; and forming an inorganic insulation layer which covers the channel layer exposed by the first opening.