Liquid Crystal Display Transparent Charge Dispersion Layer
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Solution Overview
Problem
Liquid crystal display devices suffer from image sticking, where an image remains faintly on the screen after switching, due to asymmetric electrode structures and high resistivity alignment films, leading to issues with image persistence and display quality.
Innovation Solution
Incorporating a transparent layer with lower volume resistivity than the alignment films, made from polysiloxane or organic resin materials like polyisothianaphthene, poly-3,4-ethylenedioxythiophene, or polypyrrole, which is in contact with the alignment films and disperses DC charges, reducing image sticking by improving charge dispersion and alignment film flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a high resistivity alignment film is used to maintain good alignment properties, then alignment quality is improved, but DC charge dispersion is hindered leading to image sticking
Solution Approach 1:
A transparent charge dispersion layer with lower resistivity than the alignment film is introduced as an intermediary between the alignment film and the liquid crystal layer. This layer mediates between the need for high alignment quality (maintained by the alignment film) and the need for DC charge dispersion (enabled by the transparent layer), allowing both functions to coexist without compromise.
2Stability of the object's composition
If the alignment film resistivity is increased to improve alignment stability, then alignment stability is improved, but charge accumulation occurs leading to image persistence
Solution Approach 1:
The transparent charge dispersion layer serves as a mediator that allows the alignment film to maintain high resistivity for stability while the transparent layer provides a lower resistivity path for charge dispersion, preventing image persistence.
3Manufacturing precision
If a symmetric electrode structure is used to improve display uniformity, then display uniformity is improved, but image sticking resistance is reduced
Solution Approach 1:
The transparent charge dispersion layer acts as a mediator that compensates for the reduced image sticking resistance caused by symmetric electrode structures, maintaining both display uniformity and image sticking resistance.
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 solution effectively inhibits image sticking by efficiently dispersing DC charges and maintaining high transmittance, ensuring better display quality and reduced image persistence, with image sticking fading times significantly improved compared to conventional devices.
Implementation Method 1
a transparent layer that is in contact with an opposite side of the first alignment film from the liquid crystal layer and that is lower in volume resistivity than the first alignment film
Data Source
AI summary
Provided is a liquid crystal display device includes: a first substrate (6); a second substrate (7); a liquid crystal layer (LC); a first alignment film (606) placed on the first substrate; a second alignment film (705) placed on the second substrate; and at least one of: a transparent layer (610) contacting the first alignment film on the other side of the liquid crystal layer and being lower in volume resistivity than the first alignment film; and a transparent layer (710) contacting the second alignment film on the other side of the liquid crystal layer and being lower in volume resistivity than the second alignment film, wherein the transparent layer contains polysiloxane expressed by Chemical Formula 1:where R1 and R2 each represent an alkyl group or alkoxy group having 1 to 3 carbon atoms, or a hydroxyl group, and at least 30% of hydroxyl groups are contained.