Liquid Crystal Display Device with Anisotropic Organic Particles
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Solution Overview
Problem
Conventional liquid crystal display devices face issues with defects due to electrical short-circuiting and aggregation of organic nanoparticles with anisotropy in the uniaxial form, which affect display quality and response time.
Innovation Solution
Incorporating organic particles with anisotropy in the uniaxial form into the liquid crystal layer, ensuring their longitudinal axis is not longer than the thickness of the liquid crystal layer or the distance between electrodes, thereby preventing short-circuiting and aggregation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If organic nanoparticles with anisotropy in uniaxial form are added to liquid crystal to improve response time, then response speed is improved, but electrical short-circuiting and display defects occur
Solution Approach 1:
The patent changes the critical parameter of nanoparticle length, specifying that the length of the nanoparticle in the longitudinal axis direction should be 1 μm or less. This parameter change resolves the contradiction by maintaining the responsive benefits of anisotropic nanoparticles while preventing electrical short-circuiting and display defects caused by excessively long particles.
Solution Approach 2:
The patent applies local quality by controlling the spatial distribution and orientation of nanoparticles within the liquid crystal layer. By ensuring nanoparticles are uniformly dispersed and oriented with their longitudinal axes parallel to the substrate surfaces, the patent locally optimizes each nanoparticle's contribution to response speed while preventing localized aggregation that would cause short-circuiting.
2Speed
If organic nanoparticles with high crystallinity are added to liquid crystal, then response speed is improved, but aggregation occurs causing short-circuiting
Solution Approach 1:
The patent changes the concentration parameter of nanoparticles in the liquid crystal composition, specifying a range of 0.001 wt% to 0.1 wt%. This parameter change prevents aggregation by maintaining optimal spacing between high-crystallinity nanoparticles, allowing them to individually contribute to response speed without forming conductive aggregates that would cause short-circuiting.
Solution Approach 2:
The patent introduces surfactants or surface-modified nanoparticles as intermediaries between the high-crystallinity nanoparticles and the liquid crystal matrix. These intermediaries improve dispersion stability and prevent aggregation while preserving the anisotropic properties needed for fast response, thus mediating between the conflicting requirements of high crystallinity and anti-aggregation.
Data Source
AI summary
An object of the present invention is to reduce defects in display due to short-circuiting in liquid crystal display devices using a liquid crystal material containing organic particles having anisotropy in a uniaxial form. The present invention provides a liquid crystal display device with: a first substrate; a second substrate; and a liquid crystal layer, a pixel electrode and a common electrode placed between the above described first substrate and the above described second substrate, wherein the above described liquid crystal layer contains a number of organic particles having anisotropy in a uniaxial form, and the longitudinal axis of the particle having the longest longitudinal axis from among the above described particles is no greater than the thickness of the above described liquid crystal layer or the distance between the above described pixel electrode and the above described common electrode—whichever is shorter.