Vertical Alignment Liquid Crystal Panel Chiral Agent Elastic Energy
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Solution Overview
Problem
In liquid crystal displays, image sticking occurs due to incomplete polymerization of photo- or heat-polymerizable components in the liquid crystal layer, leading to insufficient hardness and weakened restoration power of liquid crystal molecules, causing inconsistent luminance and prolonged manufacturing cycles.
Innovation Solution
A vertical alignment liquid crystal panel is designed with a liquid crystal layer comprising negative liquid crystal, a chiral agent, and a photo- or heat-polymerizable polymer, where the chiral agent increases the elastic energy between liquid crystal molecules, allowing for improved alignment and response speed, even with incomplete polymerization, and a driving voltage of 0-6V is applied to ensure proper rotation and prevent image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photo- or heat-polymerizable components are added to the liquid crystal layer to constrain tilt direction, then alignment consistency is improved, but incomplete polymerization causes image sticking phenomenon
Solution Approach 1:
The patent changes the chemical composition parameters of the liquid crystal layer by adding chiral agents and specific polymerizable monomers with controlled concentrations (0.1-10% chiral agent, 1-20% polymerizable monomer). These parameter changes enable the liquid crystal molecules to maintain consistent tilt angles while the polymer network provides sufficient restoration force to prevent image sticking, even with incomplete polymerization.
Solution Approach 2:
The patent creates a composite liquid crystal system combining liquid crystal molecules, chiral agents, and polymerizable monomers. This composite structure allows the chiral agent to induce uniform tilt orientation while the polymerizable monomer forms a cross-linked network that constrains molecular reorientation, solving both alignment consistency and image sticking issues simultaneously.
2Reliability
If light irradiation is intensified or heating time extended to ensure complete polymerization, then polymerization completeness is improved, but manufacturing cycle time increases
Solution Approach 1:
The patent modifies the polymerization parameters by selecting monomers with appropriate polymerization rates and using controlled irradiation intensity (1-100 mW/cm²) for short durations (1-60 minutes). This parameter optimization achieves sufficient polymerization without requiring extended processing times, maintaining productivity while ensuring adequate cross-linking to prevent image sticking.
3Strength
If polymerizable monomers form sufficient cross-linked structure, then restoration power is improved, but polymerization time and complexity increase
Solution Approach 1:
The patent optimizes the concentration of polymerizable monomers (1-20% by weight) and controls polymerization conditions to achieve sufficient cross-linking density for restoring liquid crystal molecules to their original state. This parameter control ensures adequate restoration power while avoiding excessive cross-linking that would require complex multi-step processes.
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 addition of a chiral agent enhances the elastic energy of liquid crystal molecules, preventing image sticking during long-term image display and improving response speed by increasing the driving voltage, thus ensuring consistent performance and reducing manufacturing time.
Implementation Method 1
the chiral agent increases the elastic energy between liquid crystal molecules
Implementation Method 2
a photo- or heat-polymerizable component is added in the liquid crystal layer, whereby electrical voltage or light irradiation may be applied to cause polymerization of the polymerizable component
Implementation Method 3
The displaying device effects light switching by applying electrical excitation and optical anisotropy of the liquid crystal
Implementation Method 4
the liquid crystal molecules to tilt in a predetermined direction set by multiple bumps and slits formed a vertical alignment film
Data Source
AI summary
The invention provides a vertical alignment liquid crystal panel, which includes a first glass substrate, a second glass substrate, and a liquid crystal layer that includes negative liquid crystal containing liquid crystal molecules having a pre-tilt angle of 0°-7°, chiral agent, and a photo- or heat-polymerizable polymer. The first glass substrate includes a liquid crystal panel driving circuit, which includes a gate driver, a source driver, a plurality of gate lines, and a plurality of data lines. The gate lines and the data lines define a plurality of pixel units, each of which includes a thin-film transistor, a common electrode, and a pixel electrode. The source driver applies a driving voltage of 0-6V via the thin-film transistor to the pixel electrode. The present invention improves elastic energy between the liquid crystal molecules and thus avoids image sticking caused by long term displaying of the same image at the same location.