LCD Panel Negative Liquid Crystal Composition for Low Residual Images
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Solution Overview
Problem
Large-sized LCD display products face challenges in simultaneously improving transmittance and reducing residual images due to limitations in technology and materials, particularly when using negative liquid crystals in alignment processes.
Innovation Solution
A liquid crystal display panel utilizing a negative liquid crystal composition with limited dibenzothiophene and dibenzofuran monomers, combined with a specific alignment layer structure and additives like antioxidants and light stabilizers, to enhance transmittance and reduce residual images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If negative liquid crystals are used to improve transmittance, then transmittance increases, but residual images worsen
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid crystal material by strictly limiting dibenzothiophene and dibenzofuran structures to ≤2% total mass content. This parameter adjustment resolves the contradiction by maintaining the negative liquid crystal properties needed for high transmittance while eliminating the specific chemical structures that cause residual image formation through ion adsorption.
Solution Approach 2:
The patent applies local quality by creating a multi-layer alignment structure with different sub-film layers having distinct properties (different resistivities, thicknesses, and materials). This localized differentiation in the alignment layer allows the system to maintain stable liquid crystal alignment (reducing residual images) while preserving the overall high transmittance benefit of negative liquid crystals.
2Reliability
If alignment process is optimized to reduce residual images, then residual images improve, but transmittance deteriorates
Solution Approach 1:
The patent employs composite materials by combining multiple alignment sub-film layers with different characteristics (organic alignment layer, inorganic alignment layer, polymer alignment layer) and adding specific functional additives (antioxidants, light stabilizers) to the liquid crystal composition. This composite approach achieves both goals: the multi-layer structure provides stable alignment to reduce residual images, while the composite liquid crystal formulation maintains high transmittance properties.
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 improves transmittance by 4.6% to 6.5% and reduces residual images, enhancing overall display quality by maintaining stable alignment and minimizing ion adsorption.
Implementation Method 1
the liquid crystal layer includes a negative liquid crystal composition
Implementation Method 2
a specific alignment layer structure
Data Source
AI summary
The provided is a liquid crystal display panel and a liquid crystal display device. The liquid crystal display panel comprises an array substrate (ARR) and a color film substrate (CF) which are cell-assembled, and a liquid crystal layer (LC) disposed between the array substrate (ARR) and the color film (CF) substrate. Wherein the liquid crystal layer (LC) comprises a negative liquid crystal composition; the total mass content of monomers containing dibenzothiophene structure and monomers containing dibenzofuran structure in the negative liquid crystal composition is not more than 2%.