Liquid Crystal Display Overcoat Curing via Inorganic Insulating Layer Segmentation
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Solution Overview
Problem
Conventional liquid crystal displays face issues with non-cured regions during the curing process of the overcoat, leading to reliability concerns due to light absorption by the roof layer, which prevents sufficient curing of the overcoat boundary portions.
Innovation Solution
The design includes an inorganic insulating layer with a second portion that does not overlap the roof layer, allowing the overcoat boundary to be positioned inside the microcavity, ensuring that the UV light can effectively cure the overcoat without non-cured regions, and a supporting member is used to prevent sagging and alignment defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the roof layer is positioned to overlap the microcavities, then the liquid crystal display structure is compact and integrated, but the overcoat boundary portions cannot be sufficiently cured due to light absorption by the roof layer
Solution Approach 1:
The inorganic insulating layer is divided into two distinct portions: a first portion that overlaps with the roof layer and provides structural support, and a second portion that extends beyond the roof layer to enable effective UV light exposure and curing of the overcoat boundary portions. This segmentation allows each portion to fulfill its specific function without interference.
Solution Approach 2:
The inorganic insulating layer is extended in the horizontal dimension beyond the roof layer's boundary, creating a second portion that protrudes laterally. This dimensional extension ensures that the overcoat boundary portions are not obscured by the roof layer during UV curing, while the first portion maintains structural integration with the roof layer.
2Strength
If the overcoat boundary is positioned inside the microcavity, then the roof layer can provide structural support, but non-cured regions are generated due to light absorption
Solution Approach 1:
The inorganic insulating layer is segmented into a first portion positioned under the roof layer for structural support and a second portion extending beyond the roof layer for enabling uniform UV curing. This segmentation resolves the conflict between structural support and curing uniformity by spatially separating these two functions.
Solution Approach 2:
The second portion of the inorganic insulating layer acts as an intermediary element that extends beyond the roof layer to provide a UV-transparent pathway for curing the overcoat boundary portions, while the first portion maintains structural support under the roof layer.
3Stability of the object's composition
If the inorganic insulating layer completely overlaps the roof layer, then structural integrity is maintained, but UV light cannot effectively cure the overcoat boundary portions
Solution Approach 1:
The inorganic insulating layer is segmented into a first portion that overlaps the roof layer to maintain structural integrity and a second portion that extends beyond the roof layer to facilitate UV curing of the overcoat boundary portions during manufacturing.
Solution Approach 2:
Different portions of the inorganic insulating layer are assigned different spatial relationships with the roof layer: the first portion overlaps the roof layer for structural stability, while the second portion extends beyond it to enable effective UV light exposure and curing during manufacturing.
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 configuration ensures the overcoat is entirely cured, enhancing the reliability of the liquid crystal display by preventing light absorption by the roof layer and maintaining the integrity of the liquid crystal layer and overcoat interface.
Implementation Method 1
light absorption by the roof layer, which prevents sufficient curing of the overcoat boundary portions
Implementation Method 2
ensuring that the UV light can effectively cure the overcoat without non-cured regions
Data Source
AI summary
An exemplary embodiment of the present invention provides a liquid crystal display including: a substrate; a thin film transistor disposed on the substrate to be connected to a gate line extending in a first direction and a data line extending in a second direction; a pixel electrode connected to the thin film transistor; a roof layer positioned over the pixel electrode; a liquid crystal layer disposed in a plurality of microcavities formed between the pixel electrode and the roof layer; an inorganic insulating layer disposed to overlap the microcavities; and an overcoat disposed on the roof layer, wherein the inorganic insulating layer includes a first portion overlapping the roof layer and a second portion that does not overlap the roof layer, and a length of the second portion in the second direction is about 20 μm or more.