FFS Liquid Crystal Display Symmetrical Layer Design

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Solution Overview

Problem

FFS-mode liquid crystal displays experience a shift in the center of the common potential during continuous operation, leading to image sticking and deterioration in display quality, due to differences in charge accumulation at various interfaces, which existing solutions have not adequately addressed.

Innovation Solution

The implementation of a liquid crystal display design where the correlation between layers over the linear and slit portions of the electrodes is made symmetrical, using inorganic and organic layers to ensure equal charge accumulation at interfaces, preventing unnecessary direct current components and maintaining the center of the common potential.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the common electrode includes linear portions and slit portions alternately arranged to generate electric fields for liquid crystal control, then the display achieves high contrast and wide viewing angles, but different charge amounts accumulate at interfaces above linear portions versus under slit portions, causing the center of common potential to shift and image sticking to occur

Engineering Contradiction:

Improvedisplay qualityVSAvoidcenter of common potential

Core Design Contradiction:

Illumination intensityVSStability of the object's composition

Solution Approach 1:

An inorganic layer is selectively formed only above the linear portions of the common electrode, creating local structural differentiation. This local modification changes the charge accumulation characteristics at specific interfaces, balancing the charge distribution between regions above linear portions and regions under slit portions, thereby preventing potential center shift while maintaining the FFS display mode's high contrast and wide viewing angle advantages

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention introduces asymmetry into the otherwise symmetric alternating pattern of linear and slit portions by adding the inorganic layer only above linear portions. This asymmetric modification creates deliberate structural differences that compensate for the inherent charge accumulation imbalance, achieving equal charge amounts at all liquid crystal interfaces and stabilizing the common potential center

Inventive Principle:

Principle #4Asymmetry

2Productivity

If continuous operation is performed to maintain display function, then the liquid crystal display operates continuously, but charge accumulation differences cause the center of common potential to shift over time, leading to image sticking

Engineering Contradiction:

Improvecontinuous operation capabilityVSAvoiddisplay quality stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The inorganic layer is formed in advance during the manufacturing process, before the liquid crystal display begins continuous operation. This preliminary structural modification pre-balances the charge accumulation characteristics at all interfaces, ensuring that even during extended continuous operation, the charge distribution remains equal and the common potential center does not shift, thereby preventing image sticking and maintaining display quality stability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The inorganic layer acts as a preventive measure against charge accumulation imbalance. By being present before continuous operation begins, it cushions or mitigates the potential for charge differentiation that would otherwise occur during prolonged use, ensuring reliable and stable display quality throughout the device's operational lifetime

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 preventing the shift of the common potential and image sticking, while maintaining symmetry in charge accumulation, thus improving the performance of FFS-mode liquid crystal displays.

Implementation Method 1

a liquid crystal disposed between a first transparent substrate and a second transparent substrate, a first electrode and second electrode which overlie the first transparent substrate and which are used to drive the liquid crystal

Methodology Applied

Scientific EffectElectric field: Electric Field

Implementation Method 2

Liquid crystal displays operating in a fringe-field switching (FFS) mode, an in-plane switching (IPS) mode, or another mode

Methodology Applied

Scientific EffectLiquid crystal: Liquid Crystals

Data Source

PatentUS8059241B2Liquid crystal display and method of manufacturing the same

Publication Date: 2011.11.15 MAGNOLIA WHITE CORP

AI summary

A liquid crystal display includes a liquid crystal disposed between a first transparent substrate and a second transparent substrate, a first electrode and second electrode which overlie the first transparent substrate and which are used to drive the liquid crystal, one or more layers overlying the first electrode, and one or more layers overlying the second electrode. The correlation between layers disposed between the first electrode and the liquid crystal agrees with the correlation between layers disposed between the second electrode and the liquid crystal.