FFS LCD Pixel Slit Orientation for Color Shift Reduction
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Solution Overview
Problem
Conventional fringe field switching (FFS) LCD panels experience color shift and disclination lines at large viewing angles, degrading display quality.
Innovation Solution
The design includes a display panel with pixel units having pixel electrodes and common electrodes with slit patterns oriented in different directions, and a color filter layer with distinct color patterns for each pixel unit, eliminating the need for two domains and reducing color shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If red, blue, and green pixels are designed to have two domains to resolve color shift issue, then color shift is reduced, but disclination lines are generated in the middle of pixels, deteriorating display quality
Solution Approach 1:
The pixel electrode or common electrode is divided into multiple slit patterns with different extension directions. Specifically, first and second pixel electrodes have slit patterns extending in a first direction, while third and fourth pixel electrodes have slit patterns extending in a second direction different from the first. This segmentation allows different regions of the pixel to have optimized electric field distributions that reduce color shift without requiring two-domain configurations that generate disclination lines.
Solution Approach 2:
The invention introduces asymmetric slit pattern orientations across different pixel types within the same pixel unit. The first and second pixels use slit patterns with one extension direction, while the third and fourth pixels use slit patterns with a different extension direction. This asymmetric design creates tailored electric field distributions for different pixel locations, effectively compensating for viewing angle-dependent color shift without the need for symmetric two-domain structures that produce disclination lines.
2Device complexity
If FFS LCD uses single domain pixel structure, then device complexity is reduced, but color shift occurs at large viewing angles
Solution Approach 1:
Different pixel electrodes or common electrodes within the same pixel unit are assigned different slit pattern orientations according to their specific locations and functions. The first and second pixel electrodes have slit patterns extending in one direction, while the third and fourth pixel electrodes have slit patterns extending in another direction. This local quality differentiation optimizes the electric field distribution for each pixel type, reducing color shift at large viewing angles while maintaining overall structural simplicity compared to two-domain designs.
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 minimizing color shift and disclination lines at large viewing angles, maintaining image accuracy and clarity.
Implementation Method 1
fringe field switching (FFS) liquid crystal display (LCD) panel
Implementation Method 2
display medium is located between the first substrate and the second substrate
Data Source
AI summary
A display panel includes a first substrate, scan lines, data lines, pixel units, a second substrate, a display medium, and a color filter layer. The scan lines and the data lines are disposed on the first substrate. The pixel units are electrically connected to the scan lines and the data lines. Each pixel unit includes first, second, third, and fourth pixels. An extension direction of slit patterns of the first and second pixels is different from an extension direction of slit patterns of the third and fourth pixels. The color filter layer includes a first color filter pattern, a second color filter pattern, a third color filter pattern, and a fourth color filter pattern respectively corresponding to the first, second, third, and fourth pixel. The color of the fourth color filter pattern is different from the colors of the first, second, and third color filter patterns.