Microcavity Liquid Crystal Display Injection Hole and Transmission Layer
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Solution Overview
Problem
Liquid crystal contamination in microcavities of liquid crystal displays during the injection process, leading to reduced display quality and increased complexity in material selection and liquid crystal quantification.
Innovation Solution
A liquid crystal display design featuring a substrate with a thin film transistor, a pixel electrode, a microcavity with an injection hole, a roof layer, and a liquid crystal transmission layer with nanoparticles, which prevents contamination by ensuring the capping layer does not contact the liquid crystal and allows for a wider material selection, and a manufacturing method that includes forming a sacrificial layer, removing it to create a microcavity, and injecting liquid crystal through a vacuum filling process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capping layer is formed to cover the injection hole formation region, then the structure is sealed and protected, but liquid crystal contamination occurs and material selection becomes complex
Solution Approach 1:
A liquid crystal transmission layer is introduced as an intermediary component between the injection hole formation region and the liquid crystal. This layer allows liquid crystal to pass through during injection while preventing contamination, and subsequently blocks the capping layer from contacting the liquid crystal, thus resolving the contradiction between sealing and contamination prevention
Solution Approach 2:
The liquid crystal transmission layer is designed with a porous structure having a gap ratio of 26% to 48%, which enables the layer to be permeable to liquid crystal during the injection process while providing filtration and protection functions, preventing contamination without blocking the injection flow
2Object-affected harmful factors
If the capping layer material is restricted to liquid crystal-compatible materials, then contamination is prevented, but material selection becomes limited and complex
Solution Approach 1:
The liquid crystal transmission layer serves as a mediator that isolates the capping layer from direct contact with liquid crystal. This allows the capping layer to be formed from a wide range of materials without contamination concerns, while the transmission layer itself controls the interaction with liquid crystal, thus expanding material selection versatility
3Quantity of substance
If liquid crystal is injected through the injection hole, then the microcavity is filled, but residual liquid crystal remains and requires additional removal processes
Solution Approach 1:
The liquid crystal transmission layer is designed to be removed after liquid crystal injection. This extraction of the temporary transmission layer structure allows for complete liquid crystal filling while eliminating the need for complex residual removal processes, as the layer itself can be selectively removed without damaging the liquid crystal or requiring additional cleaning steps
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
Reduces liquid crystal contamination, simplifies the material selection for the capping layer, and minimizes the need for removing residual liquid crystal, thereby improving display quality and process efficiency.
Implementation Method 1
a liquid crystal transmission layer positioned at the injection hole formation region
Implementation Method 2
The injection of the liquid crystal may be performed using a vacuum filling process
Data Source
AI summary
A liquid crystal display includes a substrate, a thin film transistor disposed on the substrate, a pixel electrode disposed on and connected to the thin film transistor, and a liquid crystal layer disposed in a first microcavity. The first microcavity is disposed on the pixel electrode and includes an injection hole. The liquid crystal display further includes a roof layer disposed on the first microcavity, an injection hole formation region disposed between the first microcavity and a second microcavity adjacent to the first microcavity, and a liquid crystal transmission layer disposed in the injection hole formation region.