Single-Substrate Microcavity Display with Insulated Overlapping Data Lines
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Solution Overview
Problem
Conventional liquid crystal displays require two substrates, leading to increased weight, thickness, cost, and manufacturing time, while also facing issues with horizontal crosstalk and the risk of short circuits between pixel and common electrodes.
Innovation Solution
A display device is designed using a single substrate with microcavities and a roof layer, where the data line overlaps the pixel electrode, and a light block passivation layer is formed with inorganic insulating materials to prevent short circuits and improve aperture ratio, utilizing different data voltages for the data lines and incorporating a spacer to enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two substrates are used in conventional liquid crystal displays, then the structural integrity and electrode separation are improved, but the weight, thickness, cost, and manufacturing time increase
Solution Approach 1:
The patent merges the pixel electrode and common electrode onto a single substrate, eliminating the need for two separate substrates. This integration reduces the overall weight and thickness of the display device while maintaining functional separation through insulation layers and spatial arrangement. The single substrate approach consolidates multiple components that were previously distributed across two substrates.
Solution Approach 2:
The patent introduces an insulation layer as an intermediary between the pixel electrode and common electrode on the same substrate. This mediator prevents direct contact and potential short circuits between the electrodes, ensuring proper electrical isolation without requiring a second substrate. The insulation layer acts as a barrier that maintains electrode separation functionality.
2Area of stationary object
If data line overlaps pixel electrode to improve aperture ratio, then the manufacturing complexity and short circuit risk increase
Solution Approach 1:
The patent uses an insulation layer as an intermediary between the overlapping data line and pixel electrode. This mediator allows the data line to pass over the pixel electrode region without creating a direct electrical connection, preventing short circuits while maintaining the overlapping configuration for improved aperture ratio.
Solution Approach 2:
The patent applies local quality by providing insulation specifically in the regions where data lines overlap with pixel electrodes, rather than uniformly insulating the entire substrate. This targeted approach prevents short circuits at critical overlap points while minimizing the impact on aperture ratio and maintaining manufacturing efficiency.
3Reliability
If microcavities are introduced to prevent short circuits, then the manufacturing process complexity increases
Solution Approach 1:
The patent combines the short circuit prevention function with the existing electrode and insulation layer structure. Rather than adding microcavities as separate complex features, the design integrates insulation layers and spatial arrangement within the existing manufacturing framework, achieving short circuit prevention through conventional lithography and deposition processes.
Solution Approach 2:
The patent extracts the essential function of short circuit prevention from the complex microcavity concept and implements it through simpler insulation layers and electrode positioning. This extraction maintains the protective function while eliminating the need for complex three-dimensional cavity structures, simplifying the manufacturing process.
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 reduces weight, thickness, and manufacturing time while improving horizontal crosstalk and aperture ratio, and effectively prevents short circuits between the pixel and common electrodes.
Implementation Method 1
displays an image by applying a voltage to the field generating electrodes to generate an electric field on the liquid crystal layer, determining alignment of liquid crystal molecules of the liquid crystal layer through the generated electric field
Implementation Method 2
controlling polarization of incident light
Implementation Method 3
The light block is configured to block light from passing through it
Implementation Method 4
an encapsulation layer formed on the roof layer covering the injection hole to seal the microcavity
Data Source
AI summary
A display device improves horizontal crosstalk and an aperture ratio, and includes: a substrate; a gate line and a data line formed on the substrate; a thin film transistor connected to the gate line and the data line; a pixel electrode connected to the thin film transistor; a light block overlapping the thin film transistor on the pixel electrode; a light block passivation layer overlapping the thin film transistor and the data line on the light block; a common electrode formed on the pixel electrode, spaced apart from the pixel electrode with a plurality of microcavities interposed therebetween; a roof layer formed on the common electrode; an injection hole exposing a part of each of the plurality of microcavities; a liquid crystal layer filling the plurality of microcavities; and an encapsulation layer formed on the roof layer covering the injection hole to seal the microcavity.