LCD Pixel Electrode Node Control for Light Leakage
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Solution Overview
Problem
Conventional multi-domain vertical alignment (MVA) liquid crystal display (LCD) panels face issues with light leakage and decreased contrast ratio due to random tilting of liquid crystal molecules when no voltage is applied, leading to image retention problems and poor display quality.
Innovation Solution
The LCD panel design incorporates a pixel electrode with a main electrode strip and sub electrode branches, featuring a node-controlling portion with a distinct width and strategically positioned sub electrode branches that shift along the main electrode strip, allowing controlled tilt directions of liquid crystal molecules to reduce random nodes and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If additional protrusions are added to the array substrate or color filter substrate to control liquid crystal molecule alignment, then the alignment stability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts the alignment control function from the substrate structure (protrusions) and transfers it to the pixel electrode pattern. The pixel electrode's geometric shape and position directly control liquid crystal molecule alignment through electric field distribution, eliminating the need for additional substrate protrusions and simplifying the overall device structure.
Solution Approach 2:
The pixel electrode serves multiple functions: it applies voltage to control liquid crystal switching and simultaneously controls liquid crystal alignment through its geometric pattern. This multi-functionality eliminates the need for separate alignment structures, reducing device complexity while maintaining alignment stability.
2Adaptability or versatility
If symmetric sub electrode branches are used to control liquid crystal tilt directions, then the viewing angle is improved, but random nodes appear on the main electrode strip causing image retention problems
Solution Approach 1:
The invention introduces asymmetric design elements by adding node-controlling portions at specific locations on the main electrode strip. These portions create localized electric field variations that guide liquid crystal molecule alignment in specific directions, preventing random node formation while maintaining the symmetric sub-electrode branch structure for wide viewing angle.
Solution Approach 2:
The node-controlling portions are strategically placed at specific locations on the main electrode strip where nodes tend to form. These localized modifications create targeted electric field enhancements that control liquid crystal alignment only in critical areas, maintaining overall symmetry for viewing angle while preventing random nodes locally.
3Ease of manufacture
If the main electrode strip has uniform width throughout, then the manufacturing process is simplified, but liquid crystal molecules tilt in random directions causing light leakage and reduced contrast ratio
Solution Approach 1:
The main electrode strip features localized width variations at specific positions where node-controlling portions are placed. These local width changes create targeted electric field modifications that control liquid crystal alignment in critical areas, while the majority of the electrode strip maintains uniform width for manufacturing simplicity. This selective modification prevents light leakage without significantly complicating the fabrication 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 design effectively stabilizes liquid crystal molecule alignment, minimizing image retention and light leakage, thereby enhancing the contrast ratio and display quality without the need for additional alignment protrusions.
Implementation Method 1
The liquid crystal molecules can slightly tilt by virtue of the fringe field effect of the pixel electrode and the geometrical shape of the protrusion
Implementation Method 2
When a voltage is applied to the pixel, the negative type liquid crystal molecules can tilt
Data Source
AI summary
In a liquid crystal display panel, a pixel electrode includes at least a main electrode strip and a plurality of sub electrode branches. The sub electrode branches extend outwardly from two opposite edges of the main electrode strip. The main electrode strip includes at least a node-controlling portion, the controlling width of the node-controlling portion are different from a trunk width of the main electrode strip. Otherwise, a plurality of first sub electrode branches and a plurality of second sub electrode branches are extend outwardly from two opposite edges of the main electrode strip respectively. Relating to the position of the first sub electrode branches, the second sub electrode branches has a position-shift amount along the extending direction of the main electrode strip. The position-shift amount is smaller than the branch width of the first or second sub electrode branch.