Electric-field exposure method for LCD pre-tilt angle control
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Solution Overview
Problem
Existing electric-field exposure methods for LCD panels face challenges in consistently forming pre-tilt angles for liquid crystal molecules, which affects the arrangement and display quality, particularly due to issues with uncured sealants and varying electric fields.
Innovation Solution
The method involves a display cell structure with a guard-ring line, a common electrode, and a resistance division part using transistors to create distinct electric fields between the guard-ring line and the common electrode, and between pixel electrodes and the common electrode, allowing for the formation of a curing layer with controlled pre-tilt angles through the application of specific voltage levels and light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional electric-field exposure method is used, then the process is simple, but the pre-tilt angle formation is inconsistent and affected by uncured sealants
Solution Approach 1:
The patent divides the electric field exposure into multiple independent electric fields: a first electric field between the guard-ring line and common electrode to prevent sealant flow, and a second electric field between pixel electrodes and common electrode for LC molecule alignment. This segmentation allows each electric field to serve its specific function without interference, achieving consistent pre-tilt angle formation while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The patent applies different electric field strengths and configurations to different regions of the display panel. The guard-ring line receives a stronger first electric field specifically to prevent uncured sealant flow at the periphery, while pixel electrodes receive a second electric field for LC molecule alignment in the display area. This local differentiation ensures optimal conditions for each region's specific requirements, improving overall manufacturing precision.
2Reliability
If multiple electric fields are applied to prevent sealant flow and align LC molecules, then display quality improves, but the process complexity increases
Solution Approach 1:
The patent segments the electric field exposure into distinct temporal and spatial phases: first applying the first electric field between guard-ring line and common electrode to prevent sealant flow, then applying the second electric field between pixel electrodes and common electrode for LC alignment. This segmentation allows sequential execution of multiple functions without requiring complex simultaneous control systems, improving reliability while managing process complexity.
Solution Approach 2:
The common electrode serves multiple functions: it acts as an electrode for the first electric field to prevent sealant flow and as an electrode for the second electric field to align LC molecules. This multi-functionality reduces the need for additional components, improving display quality consistency without proportionally increasing device complexity.
3Manufacturing precision
If the first electric field is made stronger to prevent sealant flow, then sealant curing is improved, but the overall electric field distribution becomes more complex
Solution Approach 1:
The patent applies a stronger first electric field specifically in the guard-ring line region where sealant curing is needed, while using a different (second) electric field strength in the pixel electrode region for LC alignment. This local quality differentiation ensures uniform sealant curing at the periphery without requiring excessive field strength throughout the entire panel, achieving manufacturing precision while managing electric field distribution complexity through spatial selectivity.
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 approach ensures precise arrangement of liquid crystal molecules, prevents uncured sealant flow, and maintains consistent pre-tilt angles, enhancing display quality and reliability by forming multiple electric fields that cure the sealant and align LC molecules effectively.
Implementation Method 1
A resistance division part is connected to a node which is connected to a data pad and a gate pad. The resistance division part may include a transistor. The resistance division part is configured to output a third level voltage by dividing the first level voltage and the second level voltage.
Implementation Method 2
Light is radiated to the display cell when a first electric field is formed between the guard-ring line and the common electrode, and a second electric field is formed between the pixel electrode and the common electrode.
Implementation Method 3
An electric-field exposure process is used for allowing liquid crystal molecules in an LCD panel to have pre-tilt angles. By the electric-field exposure process, a curing layer is formed on the array substrate and the opposing substrate of the LCD panel.
Implementation Method 4
Light is radiated to the display cell when a first electric field is formed between the guard-ring line and the common electrode, and a second electric field is formed between the pixel electrode and the common electrode.
Data Source
AI summary
An electric-field exposure method includes forming a display cell. The display cell comprises a pixel electrode electrically connected to a data line and a gate line. A guard-ring line surrounds a display area on which the pixel electrode is disposed. A common electrode overlaps the guard-ring line. A resistance division part is connected to a node which is connected to a data pad and a gate pad. A first electrode and a second electrode are provided with first and second electronic signals, respectively. The first electrode is connected to the guard-ring line. The second electrode is electrically connected to the common electrode. The node is provided with a divided signal obtained by dividing the first and second signals through the resistance division part.