Alignment Protrusion Optical Density for LCD Light Leakage
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Solution Overview
Problem
Conventional liquid crystal display panels with transparent alignment protrusions suffer from light leakage in dark conditions due to the phase difference caused by non-perpendicular liquid crystal molecules, which affects image quality and viewing angles.
Innovation Solution
The use of alignment protrusions with a specific optical density range of about 0.3/μm to 3/μm, made from materials like indium tin oxide, aluminum zinc oxide, or combinations thereof, which are designed to reduce light leakage by adjusting the tilt angles of liquid crystal molecules and improving aperture ratio, while allowing for various shapes and materials such as organic or inorganic materials, dyes, and pigments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transparent alignment protrusions are used, then the liquid crystal molecules can be aligned properly to achieve wide viewing angles, but light leakage occurs in dark conditions
Solution Approach 1:
The alignment protrusion changes its optical properties by introducing an optical density layer that absorbs light in dark conditions, preventing light leakage while maintaining the alignment function. The optical density value is specifically controlled to balance light leakage prevention with normal display performance.
Solution Approach 2:
The patent introduces a new parameter - optical density - to characterize and control the light leakage issue. By optimizing the optical density value of the alignment protrusion, the patent achieves a balance between preventing light leakage and maintaining proper liquid crystal alignment for wide viewing angles.
2Object-generated harmful factors
If the optical density of alignment protrusion is increased to reduce light leakage, then light leakage is minimized, but liquid crystal molecule alignment may be affected
Solution Approach 1:
The patent systematically optimizes the optical density parameter within a specific range (0.3 to 3.0) to achieve the best balance between light leakage prevention and alignment precision. This parameter optimization ensures that the alignment protrusion maintains its function while minimizing harmful light leakage.
Solution Approach 2:
The optical density layer is applied specifically to the alignment protrusion region rather than the entire substrate, allowing localized control of light leakage without affecting the overall alignment quality. This localized approach maintains alignment precision while reducing light leakage at the critical protrusion areas.
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
The solution effectively minimizes light leakage in dark conditions, providing a smoother light leakage curve and maintaining image quality across wide viewing angles, while avoiding misalignment issues with appropriate optical density and material selection.
Implementation Method 1
the alignment protrusion has an optical density of about 0.3/μm to about 3/μm
Data Source
AI summary
The disclosed is a liquid crystal display panel having alignment protrusions with an appropriate optical density (OD) of about 0.3/μm to 3/μm, and preferably of about 0.8/μm to 1.3/μm. The invention solves problems such as light leakage in dark conditions caused by transparent alignment protrusions and mismatch caused by black alignment protrusions overlapping the alignment marks.