LCD Pixel Electrode Node Patterns for Dark Line Elimination
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Solution Overview
Problem
Conventional liquid crystal display (LCD) technologies suffer from the formation of disclination lines or dark lines around pixel electrodes due to non-orthogonality between the pattern of convex portions and pixel electrodes, which deteriorate display quality by extending into the display zone.
Innovation Solution
The LCD panel design includes a passivation layer with convex portions and pixel electrodes with node patterns that protrude from the periphery, where the node patterns can cover, position between, or be outside the convex portions, and are sheltered by a black matrix, allowing liquid crystal molecules to align outside the display zone, thereby improving transmittance and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If convex portions are used to control liquid crystal alignment, then viewing angle is improved, but dark lines form around pixel electrodes due to non-orthogonality between convex portions and pixel electrodes
Solution Approach 1:
The pixel electrode is segmented into a central region and peripheral nodal regions. The nodal patterns at the periphery are specifically designed to cover or align with the convex portions, separating the function of the central region (display) from the peripheral region (alignment control). This segmentation allows the convex portions to control liquid crystal alignment without causing dark lines in the display zone.
Solution Approach 2:
Different regions of the pixel electrode are given different qualities: the central region maintains a flat surface for uniform display, while the peripheral nodal regions incorporate patterns that align with the convex portions. This local differentiation ensures that the convex portions control alignment at the boundaries without creating dark lines in the central display area.
2Object-affected harmful factors
If node patterns are added to pixel electrodes, then dark lines are positioned outside display zone, but device complexity increases
Solution Approach 1:
The nodal patterns are merged with the pixel electrode structure as an integrated component rather than a separate element. The node patterns are formed as part of the pixel electrode material layer, combining the functions of pixel definition and liquid crystal alignment control into a single unified structure.
Solution Approach 2:
The nodal patterns serve as an intermediary element between the pixel electrode and the convex portions of the passivation layer. They mediate the interaction by providing a transition zone that aligns with the convex portions, directing liquid crystal molecules away from the display zone while maintaining the integrity of the pixel electrode structure.
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 enhances display quality by positioning dark lines or disclination lines outside the display zone or sheltering them with a black matrix, improving transmittance and overall image quality.
Implementation Method 1
The convex portions of the passivation layer can control a vertical alignment of liquid crystal molecules, so as to enlarge a viewing angle of the LCD
Implementation Method 2
the node patterns are positioned between the convex portions... the liquid crystal molecules which are arranged at non-45 degrees are allowed to extend outside a display zone of the pixel electrodes, hence improving the transmittance thereof and enhancing the display quality
Data Source
AI summary
The present invention provides a liquid crystal display panel and a display apparatus using the same. The liquid crystal display panel comprises a first substrate, a second substrate and a liquid crystal layer. The liquid crystal layer is formed between the first substrate and the second substrate. The second substrate includes a passivation layer and a plurality of pixel electrodes. The passivation layer includes a plurality of convex portions, and the pixel electrodes are formed on the passivation layer. Each of the pixel electrodes has a plurality of node patterns protruding from the periphery of the pixel electrode. The present invention can improve a dark line problem in the conventional technology.