LCD Sheet Voltage Regions for Polymer Alignment
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Solution Overview
Problem
Conventional polymer-stabilized alignment (PSA) technology for LCD panels faces challenges such as high manufacturing costs, variability due to wire load deformation, and discharge issues in non-panel regions, with a lengthy process that cannot apply alignment to multiple panels simultaneously.
Innovation Solution
An LCD sheet design with multiple voltage-applying regions, input circuits, and wires allows for simultaneous alignment processing during sealant hardening, reducing manufacturing time and variability, and includes a repair structure for backup voltage application to prevent short-circuits and ensure consistent polymer alignment across multiple panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PSA technology processes LCD panels individually after dividing the sheet, then each panel can be processed separately, but manufacturing time increases and manufacturing costs increase
Solution Approach 1:
The LCD sheet is divided into multiple voltage-applying regions, each capable of independent voltage application. This segmentation allows simultaneous processing of multiple panels while maintaining individual control, resolving the contradiction between processing consistency and manufacturing efficiency
Solution Approach 2:
Multiple LCD panels are merged into a single sheet structure with shared substrates and sealants. The patent combines individual panel processing into a unified simultaneous process, reducing manufacturing time and costs while maintaining quality through the voltage-applying region design
2Manufacturing precision
If voltage is increased during PSA manufacturing to improve alignment, then polymer alignment improves, but wire deformation increases causing large variance among LCD panels
Solution Approach 1:
The voltage application system is segmented into multiple independent voltage-applying regions. Each region can be controlled separately, allowing optimized voltage application that improves alignment precision without causing excessive wire deformation that would lead to variance among panels
Solution Approach 2:
Different regions of the LCD sheet have different voltage application characteristics. The patent applies local quality control by providing separate voltage-applying regions with appropriate voltage levels for each area, improving overall alignment precision while maintaining wire stability
3Area of moving object
If gap between substrates is reduced to improve display quality, then aperture ratio improves, but discharge occurs in non-panel regions during voltage application
Solution Approach 1:
The LCD sheet is segmented into panel regions and non-panel regions with distinct voltage application characteristics. The voltage-applying regions are positioned to avoid discharge issues in non-panel areas while maintaining the reduced gap for improved aperture ratio
Solution Approach 2:
The patent introduces voltage-applying regions as intermediary structures that mediate between the substrate gap reduction and discharge prevention. These regions provide controlled voltage application paths that enable small gaps without causing harmful discharge in non-panel areas
4Productivity
If alignment processing is applied to LCD sheet directly instead of individual panels, then manufacturing time shortens, but processing complexity increases
Solution Approach 1:
The complex simultaneous processing is made manageable through segmentation into multiple voltage-applying regions. Each region can be independently controlled and processed, reducing the overall processing complexity while enabling direct sheet processing for faster manufacturing
Solution Approach 2:
The voltage-applying regions serve multiple functions: they provide voltage for alignment, act as processing guides, and enable simultaneous multi-panel treatment. This multi-functionality simplifies the processing system while achieving high-speed 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 design reduces manufacturing costs, minimizes variability in LCD panels, and enables efficient, simultaneous PSA processing across multiple panels, ensuring consistent alignment and reducing the risk of short-circuits, thereby improving the manufacturing efficiency and reliability of the LCD sheets.
Implementation Method 1
when voltage and ultra-velvet (UV) light are applied onto the first substrate and the second substrate, the reactive monomers are separated from the liquid crystal molecules to form polymers on the surface of the first substrate and the second substrate
Implementation Method 2
the polymers are stacked along the direction of the liquid crystal molecules direction due to the interaction between the polymers and the liquid crystal molecules. Thus, the liquid crystal molecules must have a pre-tilt angle in a particular direction
Data Source
AI summary
A liquid crystal display (LCD) sheet comprising a first and a second substrates, and a liquid crystal (LC) layer is provided. The second substrate comprises several voltage-applying regions, a first input circuit, a first and a second wires, a first and a second panel input pads. Each voltage-applying region has several panel regions. The first input circuit is disposed in each voltage-applying region, and comprises a first and a second sheet input pads. The first and the second wires are both disposed in each of the voltage-applying regions, and are electrically connected to the first and the second sheet input pads, respectively. The first and the second panel input pads are disposed in each of the panel regions, and are electrically connected to the first and the second wires, respectively. The LC layer is disposed between the first and the second substrates, and is positioned in the panel region.