Liquid Crystal Layer Segmentation for Protrusion Interference
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Solution Overview
Problem
The interference of polymer protrusions on the alignment film surface with liquid crystal molecules' deflection under an electric field reduces light transmittance and image quality in LCD panels.
Innovation Solution
A display panel design featuring a first and second substrate with protrusions and a liquid crystal layer comprising three layers of negative type liquid crystal molecules with varying dielectric anisotropy parameters, where the first and second liquid crystal layers have higher dielectric anisotropy than the third, ensuring consistent deflection values under an electric field, reducing the influence of protrusions on light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polymer protrusions are formed on the alignment film surface to anchor liquid crystal molecules, then pre-tilt angle is formed, but the polymer protrusions interfere with liquid crystal molecule deflection under electric field, reducing light transmittance and display quality
Solution Approach 1:
The liquid crystal layer is divided into three distinct sub-layers with different dielectric anisotropy parameters. The first and second liquid crystal layers adjacent to the alignment films have higher dielectric anisotropy (|Δε1|≥4, |Δε2|≥4) to maintain strong anchoring to polymer protrusions, while the third intermediate layer has lower dielectric anisotropy (3≤|Δε3|<4) to reduce interference with deflection and improve light transmittance.
Solution Approach 2:
Different regions of the liquid crystal layer are assigned different dielectric anisotropy characteristics. The regions adjacent to the alignment films (first and second liquid crystal layers) have high dielectric anisotropy to ensure stable anchoring, while the intermediate region (third liquid crystal layer) has lower dielectric anisotropy to minimize interference with electric field-induced deflection and improve optical performance.
2Stability of the object's composition
If liquid crystal molecules are anchored to polymer protrusions to form pre-tilt angle, then alignment is achieved, but nearby liquid crystal molecules cannot deflect in predetermined direction under electric field
Solution Approach 1:
The liquid crystal layer is segmented into three functional zones with progressively different dielectric anisotropy values. The first and second layers provide strong anchoring (|Δε|≥4) for alignment stability, while the third intermediate layer provides a transition zone with lower dielectric anisotropy (3≤|Δε|<4) that facilitates smooth deflection and improves overall responsiveness to electric fields.
Solution Approach 2:
The dielectric anisotropy parameter is varied across different layers of the liquid crystal composition. By controlling the absolute value of dielectric anisotropy to be not less than 4 for the outer layers and not less than 3 but less than 4 for the intermediate layer, the patent optimizes both anchoring strength and deflection characteristics to resolve the contradiction between alignment stability and operational responsiveness.
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 design enhances image quality by minimizing the interference of polymer protrusions on liquid crystal molecule deflection, thereby improving light transmittance and display quality.
Implementation Method 1
an absolute value of a dielectric anisotropy parameter of the liquid crystal molecules in the first liquid crystal layer and an absolute value of a dielectric anisotropy parameter of the liquid crystal molecules in the second liquid crystal layer are both greater than an absolute value of a dielectric anisotropy parameter of the liquid crystal molecules in the third liquid crystal layer, so that under action of a same electric field, the first protrusion, and the second protrusion, a difference between a deflection value of the liquid crystal molecules in the first liquid crystal layer and a deflection value of the liquid crystal molecules in the third liquid crystal layer is within a preset range
Data Source
AI summary
A display panel and a method for fabricating the same are provided. The display panel includes a first substrate, a first protrusion, a first liquid crystal layer, a third liquid crystal layer, a second liquid crystal layer, a second protrusion, and a second substrate in order from top to bottom. The first liquid crystal layer, the second liquid crystal layer, and the third liquid crystal layer include negative type liquid crystal molecules. An absolute value of a dielectric anisotropy parameter of the liquid crystal molecules in the first liquid crystal layer and an absolute value of a dielectric anisotropy parameter of the liquid crystal molecules in the second liquid crystal layer are both greater than an absolute value of a dielectric anisotropy parameter of the liquid crystal molecules in the third liquid crystal layer.