Liquid Crystal Display Viewing Angle Control Sub-Pixel Light Leakage
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Solution Overview
Problem
Existing liquid crystal display panels with viewing angle control sub-pixels in FFS mode suffer from light leakage along the direct viewing direction, which compromises the viewing angle control function and image contrast.
Innovation Solution
The liquid crystal display panel incorporates a first polarizer on one substrate and a second polarizer on the other with perpendicular optical axes, featuring slit apertures in the upper electrode with alignment films subjected to rubbing treatments inclined to the perpendicular line of the slit aperture's extending direction, reducing disclination and light leakage along the direct viewing direction while maintaining effective viewing angle control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a viewing angle control sub-pixel is added to control viewing angle characteristics, then viewing angle control capability is improved, but light leakage along the direct viewing direction occurs and image contrast deteriorates
Solution Approach 1:
The patent applies different rubbing treatment directions to different regions: the alignment film in the display area receives rubbing treatment in a first direction, while the alignment film in the viewing angle control sub-pixel area receives rubbing treatment in a second direction that is inclined relative to the first direction. This local differentiation of alignment conditions allows the viewing angle control sub-pixel to function properly while preventing light leakage in the display area, thus resolving the contradiction between viewing angle control capability and light leakage prevention.
2Adaptability or versatility
If the rubbing treatment direction is aligned perpendicular to the slit aperture extending direction, then viewing angle control function is enhanced, but disclination occurs and light leakage increases
Solution Approach 1:
The patent introduces asymmetry in the rubbing treatment configuration by setting the rubbing direction in the viewing angle control sub-pixel area to be inclined at a specific angle (e.g., 5-15 degrees) relative to the perpendicular direction of the slit aperture extending direction. This asymmetric rubbing treatment prevents the formation of disclination by creating a more uniform liquid crystal alignment, thereby maintaining alignment stability while preserving viewing angle control function.
3Adaptability or versatility
If a viewing angle control sub-pixel is incorporated in FFS mode, then wide viewing angle characteristics are achieved, but the panel thickness increases due to additional layers
Solution Approach 1:
The patent merges the viewing angle control function with the existing FFS mode display structure by integrating the viewing angle control sub-pixel within the same panel architecture. The viewing angle control sub-pixel shares the common electrode and inter-electrode insulating film with the display area, and both regions use the same FFS mode operating principle. This merging approach enables viewing angle control functionality without adding significant thickness to the panel.
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 effectively suppresses light leakage along the direct viewing direction, maintaining favorable contrast and viewing angle control while allowing intentional narrowing of the viewing angle for confidentiality, with the viewing angle control sub-pixel operating in the normally black mode.
Implementation Method 1
a first alignment film that is formed on a surface of the upper electrode and in the slit apertures and is subjected to rubbing treatment parallel or perpendicular to the optical axis of the first polarizer
Implementation Method 2
The liquid crystal display panel is to display an image by changing the orientation of liquid crystal molecules aligned along a predetermined direction by an electric field to thereby change the amount of light passing through the liquid crystal layer
Implementation Method 3
a first polarizer configured to be provided on the outer surface side of the first substrate, and a second polarizer configured to be provided on the outer surface side of the second substrate and have the optical axis perpendicular to the optical axis of the first polarizer
Data Source
AI summary
Disclosed herein is a liquid crystal display panel including: first substrate and second substrate configured to sandwich a liquid crystal layer and be disposed opposed to each other, a display sub-pixel and a viewing angle control sub-pixel being formed in the first substrate and the second substrate; a first polarizer configured to be provided on an outer surface side of the first substrate; and a second polarizer configured to be provided on an outer surface side of the second substrate and have an optical axis perpendicular to an optical axis of the first polarizer.