FFS LCD Pixel Electrode Spacing for Transmittance Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
LCD panels face optical transmittance loss and uniformity issues due to process variations in electrode alignment and width during the lithography-etching process, affecting the display quality and yield of fringe-field switching (FFS) mode liquid crystal display panels.
Innovation Solution
The FFS mode LCD panel design includes specific electrode spacing parameters, such as d1 and d2, and the use of positive dielectric anisotropy liquid crystal materials with controlled birefringence, to maintain optical transmittance and uniformity even with process variations, improving the yield by optimizing the electrode spacing and liquid crystal layer properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the electrode alignment and width are controlled during lithography-etching process, then the manufacturing precision is improved, but the process complexity and cost increase
Solution Approach 1:
The patent changes the geometric parameters of the common electrode (width, position, shape) to create an optimized electrode structure. By adjusting these parameters, the design achieves tolerance to alignment variations without requiring ultra-precise manufacturing processes, thus resolving the contradiction between manufacturing precision and process complexity
Solution Approach 2:
The patent designs the common electrode structure in advance to compensate for potential alignment errors. The electrode geometry is specifically configured to create a margin of tolerance that cushions against the effects of manufacturing variations, ensuring consistent optical performance even when alignment is not perfect
2Manufacturing precision
If the electrode spacing parameters d1 and d2 are optimized, then the optical transmittance uniformity is improved, but the design complexity increases
Solution Approach 1:
The patent optimizes specific geometric parameters (d1, d2, electrode width, electrode position) of the common electrode structure. By carefully selecting these parameters, the design achieves uniform optical transmittance across the pixel area while maintaining a relatively simple electrode configuration that does not excessively increase design complexity
3Productivity
If the common electrode structure is optimized to tolerate process variations, then the yield is improved, but the electrode design complexity increases
Solution Approach 1:
The patent optimizes the geometric parameters of the common electrode to create a design that is inherently tolerant of process variations. This parameter optimization allows the electrode structure to maintain consistent performance across manufacturing variations, improving yield without requiring overly complex multi-layer or multi-component electrode designs
Solution Approach 2:
The patent applies different geometric characteristics to different regions of the common electrode. The electrode structure is locally optimized in areas most sensitive to alignment variations, while maintaining simpler geometry in less critical areas, thus improving yield without uniformly increasing complexity across the entire electrode structure
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 optimized design significantly reduces optical transmittance loss and improves uniformity within the pixel area, enhancing the display quality and manufacturing yield of FFS mode LCD panels by tolerating process variations.
Implementation Method 1
By applying an external voltage to the electrodes on both substrates to form an electric field across the liquid crystal layer, the alignment of liquid crystal molecules is affected and thus rearranged
Implementation Method 2
the liquid crystal layer has a predetermined thickness (D) and a liquid crystal materials, wherein and the product of the predetermined thickness (D) of the liquid crystal layer and the birefringence (Δn) of the liquid crystal materials of the liquid crystal layer (Δn*D). The Liquid crystal material of the liquid crystal layer has positive dielectric anisotropy (Δ∈)
Implementation Method 3
The Liquid crystal material of the liquid crystal layer has positive dielectric anisotropy (Δ∈)
Data Source
AI summary
A Fringe-Field Switching (FFS) mode liquid crystal display (LCD) panel with optimized designs of pixel areas and/or liquid crystal materials is provided. The FFS mode LCD panel includes an active-element array substrate with a plurality of pixel areas, an opposite substrate, and a liquid crystal layer. Each pixel area comprises a plurality of first common electrodes, a second common electrode between the pixel area and another horizontally adjacent pixel area, and a pixel electrode. The optical transmittance and homogeneity of the pixel area of the display panel are modified by manipulating the relative position of the electrodes in the pixel areas on the active-element array substrate and/or adopting specific parameters of liquid crystal materials in the liquid crystal layer of the display panel.