Patterned Intervening Layer Reduces Light Leakage in LCD Panels
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Solution Overview
Problem
Conventional LCD panels suffer from dark-state light leakage issues, which degrade contrast due to the structure of the pixel electrode and alignment of liquid crystal molecules, leading to inefficiencies in light control and display performance.
Innovation Solution
The introduction of a patterned intervening layer with a '*'-shaped structure between the second insulation layer and the pixel electrode layer, featuring trunks and jags that reduce the perimeter of the sub-pixel, enhancing the electric field intensity and optimizing the tilt angle of liquid crystals, thereby minimizing dark-state light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional pixel electrode structure with trunk and branch portions is used, then the alignment direction of liquid crystal molecules can be controlled, but dark-state light leakage occurs and contrast is degraded
Solution Approach 1:
The pixel electrode is divided into multiple independent conductive posts (first, second, third, and fourth conductive posts) arranged in a specific pattern. This segmentation allows precise control of electric field distribution in different regions, enabling independent alignment control of liquid crystal molecules in each quadrant of the pixel, thereby reducing light leakage while maintaining alignment precision.
Solution Approach 2:
The conductive posts are positioned asymmetrically within the pixel structure, with specific spacing relationships (e.g., distance between adjacent posts is 1-5 μm, while distance between opposite posts is 2-10 μm). This asymmetric arrangement creates non-uniform electric field patterns that effectively control liquid crystal alignment in different directions, preventing the formation of uniform tilt patterns that cause light leakage.
2Object-affected harmful factors
If the perimeter of the intervening layer is reduced, then dark-state light leakage is minimized and contrast is enhanced, but the electric field intensity and liquid crystal tilt control are affected
Solution Approach 1:
The patent transitions from controlling alignment primarily in the planar dimension to utilizing the vertical dimension by forming conductive posts with specific heights (5-20 μm) that extend into the liquid crystal layer. This three-dimensional structure creates vertical electric field components that enhance control over liquid crystal tilt angle while maintaining a compact perimeter footprint, thus reducing light leakage without sacrificing field intensity.
Solution Approach 2:
The patent optimizes multiple parameters including the height of conductive posts (5-20 μm), spacing between posts (1-5 μm), and the perimeter of the intervening layer (500-30000 μm). By carefully adjusting these parameters, the electric field intensity is maintained at optimal levels while the perimeter is minimized to reduce light leakage, achieving a balance between both requirements.
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 the perimeter of the intervening layer by approximately 80% compared to conventional designs, significantly minimizing dark-state light leakage and enhancing contrast in LCD panels.
Implementation Method 1
the manufacturer of the display apparatus has utilized the photo-alignment technology to control the alignment direction of the liquid crystal molecules
Implementation Method 2
the liquid crystal molecules within the pixel will tilt to, for example, four different directions
Implementation Method 3
The orientation of the tilt of the liquid crystal molecules can be controlled by properly designing the jag portions and the intervals therebetween
Data Source
AI summary
A display panel includes a first substrate, a second substrate, a display medium layer disposed between the first substrate and the second substrate, a first metal layer, a first insulation layer disposed on the first metal layer, a second metal layer, a second insulation layer disposed on the second metal layer, a pixel electrode layer and an intervening layer. The first metal layer is disposed on the first substrate to form a signal wiring and a gate. The second metal layer is disposed on the first insulation layer to form a data wiring, a source and a drain. The intervening layer is a patterned layer and disposed between the second insulation layer and the pixel electrode layer. The pixel electrode layer covers the intervening layer and the second insulation layer, and the perimeter of the intervening layer of a sub-pixel ranges between 500 μm and 30000 μm.