FFS Liquid Crystal Display Electrode Structure Optimization
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Solution Overview
Problem
FFS mode liquid crystal display devices face challenges in achieving optimal display quality due to differences in electrode structure and opening configurations compared to IPS mode devices, leading to variations in transmittance ratio and driving voltage, which affect manufacturing yield and display uniformity.
Innovation Solution
The FFS mode liquid crystal display device is optimized by adjusting the width of the minor axis of openings and the electrode width, where the sum of these dimensions is equal to or below 10 μm, with the electrode width being 2.5 μm or more and the minor axis width being 4.0 μm or more, to stabilize the voltage-transmittance curve and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the width of the minor axis of openings and electrode width are adjusted to optimize transmittance ratio, then display quality improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by optimizing specific dimensional parameters (electrode width L ≥ 2.5 μm, minor axis width S ≥ 4.0 μm, sum L+S ≤ 10 μm) to achieve the desired balance between manufacturing feasibility and display quality consistency. This resolves the contradiction by establishing concrete parameter ranges that satisfy both manufacturing capabilities and reliability requirements.
2Use of energy by moving object
If the electrode structure is optimized for FFS mode display quality, then transmittance ratio improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by optimizing the electrode structure locally within the FFS mode display device. Specifically, it configures the upper electrode layer with openings having specific dimensional characteristics (L and S parameters) to achieve improved transmittance ratio, while maintaining the overall simplicity of the FFS structure. This resolves the contradiction by making targeted local optimizations rather than requiring complex overall restructuring.
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 maintaining a consistent voltage-transmittance ratio, reducing variations in luminance and chrominance, and increasing manufacturing process margins, thereby improving yield and display uniformity.
Implementation Method 1
voltage is applied between the pixel electrode and the common electrode to thereby generate an electric field that is substantially parallel to the substrate
Implementation Method 2
liquid crystal molecules are driven mainly within a plane parallel to the surface of the substrate
Data Source
AI summary
A liquid crystal display device includes a substrate, an insulating layer, an upper electrode layer, and a lower electrode layer. The upper electrode layer and the lower electrode layer are formed on the same the substrate via the insulating layer. A plurality of openings are formed in the upper electrode layer and arranged parallel to each other so that an electric field is passed therethrough. Liquid crystal molecules are driven by applying voltage between the upper electrode layer and the lower electrode layer. A minor axis of each of the openings has a width in a range in which a V-T curve, which represents a relationship between voltage and transmittance ratio, does not shift with variation in the width of the minor axis.