Display Device Protrusion Meniscus Control
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Solution Overview
Problem
Liquid crystal display devices experience light leakage near the liquid crystal injection hole, which degrades the quality of displayed images.
Innovation Solution
A display device design featuring a substrate with a pixel area, a thin-film transistor, a pixel electrode, a common electrode, and a roof layer made of organic material with protrusions at the edges of the pixel area, creating a space for the liquid crystal injection hole that extends beyond the pixel area to position the meniscus outside, thereby reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the liquid crystal injection hole is formed within the pixel area, then the liquid crystal layer can be injected properly, but light leakage occurs near the injection hole which degrades image quality
Solution Approach 1:
The patent extends the liquid crystal injection hole from a two-dimensional planar feature to a three-dimensional structure by forming protrusions on the common electrode and roof layer that extend beyond the pixel area boundaries. This dimensional extension allows the injection hole to reach into adjacent pixel regions, enabling proper liquid crystal injection while the protrusions guide the liquid crystal meniscus away from the pixel area to prevent light leakage.
Solution Approach 2:
The protrusions on the common electrode and roof layer act as intermediary structures that mediate between the injection hole and the liquid crystal layer. These protrusions create a physical guide that directs the liquid crystal meniscus formation, allowing the injection hole to function properly while preventing the meniscus from entering the pixel area where it would cause light leakage.
2Stability of the object's composition
If the meniscus of the liquid crystal layer is positioned inside the pixel area, then the liquid crystal layer fills the space properly, but light leakage occurs at the edges of the pixel area
Solution Approach 1:
The patent applies local quality by creating protrusions only at specific locations on the common electrode and roof layer where they extend beyond the pixel area boundaries. These localized protrusions provide directional guidance for the liquid crystal meniscus formation, ensuring that the meniscus is drawn outside the pixel area rather than filling the space uniformly, thereby preventing edge light leakage while maintaining proper liquid crystal layer composition.
3Object-affected harmful factors
If protrusions are added to the common electrode and roof layer to extend beyond the pixel area, then light leakage is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent merges the protrusion structures into existing components (the common electrode and roof layer) rather than adding them as separate elements. The protrusions are formed as integral parts of the common electrode pattern and the roof layer structure, combining the light leakage prevention function with the existing structural elements. This merging approach reduces overall device complexity compared to adding independent protrusion components.
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 design effectively reduces or prevents light leakage by positioning the meniscus of the liquid crystal layer outside the pixel area, enhancing image quality by minimizing light leakage at the edges.
Implementation Method 1
a meniscus of the liquid crystal layer is disposed outside of the pixel area
Data Source
AI summary
A display device includes a substrate including a pixel area, a thin-film transistor formed on the substrate, a pixel electrode connected to the thin-film transistor, a common electrode formed on the pixel electrode, a space formed between the pixel electrode and the common electrode, and a roof layer formed on the common electrode. The common electrode and the roof layer include a protrusion protruding from at least one of an upper edge and a lower edge of the pixel area.