Liquid Crystal Display Pixel Structure for Color Shift Reduction
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Solution Overview
Problem
Existing fringe field switching (FFS) liquid crystal displays experience color shift issues at large viewing angles, limiting their acceptable viewing range and resulting in inferior display quality due to single-domain pixel structures that align liquid crystal molecules in a single orientation.
Innovation Solution
A liquid crystal display panel with a pixel structure featuring stripe electrodes with gradually varied included angles along the direction, allowing for multi-domain alignment and reducing color shift by adjusting the chroma coordinates of sub-pixels, thereby eliminating color shift at large viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If single-domain pixel structures are used in FFS LCD, then the device complexity is reduced and manufacturing is simplified, but color shift occurs at large viewing angles resulting in inferior display quality
Solution Approach 1:
The pixel electrode is divided into multiple domains (first domain and second domain) with different alignment directions. Each domain has its own alignment direction that varies across different sub-pixel regions, allowing the liquid crystal molecules to be aligned in multiple orientations within a single pixel structure. This segmentation enables color compensation across different viewing angles without complicating the overall manufacturing process.
Solution Approach 2:
Different regions of the pixel structure are assigned different alignment characteristics. Specifically, the first and second alignment directions are configured based on the chroma coordinates of different sub-pixel regions (red, green, blue), with each region having optimized alignment angles to compensate for color shift at large viewing angles. This local optimization maintains manufacturing simplicity while improving display quality.
2Ease of operation
If single-domain alignment is used, then the liquid crystal molecule alignment is simplified, but the acceptable viewing angle range is restricted due to color shift
Solution Approach 1:
The liquid crystal alignment is segmented into multiple domains within each pixel structure. The first domain aligns liquid crystal molecules along a first alignment direction, while the second domain aligns them along a second alignment direction. This multi-domain approach maintains ease of operation through standardized alignment processes while expanding the acceptable viewing angle range by compensating for color shift through directional diversity.
Solution Approach 2:
The alignment directions are dynamically configured based on the specific sub-pixel region and its chroma coordinates. The first and second alignment directions vary across different red, green, and blue sub-pixel regions to optimize color compensation at large viewing angles, while maintaining a systematic and repeatable alignment process.
3Ease of manufacture
If stripe electrodes with fixed included angles are used, then the manufacturing process is simplified, but color shift cannot be eliminated at large viewing angles
Solution Approach 1:
The included angles of the stripe electrodes are locally optimized for different sub-pixel regions. The first and second included angles are specifically configured based on the chroma coordinates of red, green, and blue sub-pixel regions. This local optimization enables color shift compensation at large viewing angles while maintaining a systematic fabrication process that can be implemented through standard manufacturing techniques.
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 pixel structure effectively eliminates color shift in large viewing angles, enhancing display quality by compensating for color variations and maintaining accurate color representation across different viewing angles.
Implementation Method 1
the liquid crystal molecules of the pixel structures are aligned in a single orientation
Implementation Method 2
an electric field along a single direction is provided between a pixel electrode and a common electrode
Data Source
AI summary
A liquid crystal display panel including a first substrate, scan lines extending along a first direction, data lines, active devices, pixel electrodes, common electrodes, a second substrate and a liquid crystal layer is provided. The pixel electrodes are respectively disposed in sub-pixel regions and coupled to the corresponding active devices. The common electrodes are respectively disposed corresponding to the pixel electrodes. Each common electrode or each pixel electrode includes plural stripe electrodes arranged side by side. Each stripe electrode includes a first section and a second section respectively disposed on two opposite sides of a reference axis, wherein a major axis of the first section forms an included angle with a major axis of the second section. The included angles of the stripe electrodes in each sub-pixel region are gradually varied along the first direction. The liquid crystal layer is disposed between the first substrate and the second substrate.