Liquid Crystal Cell Viewing Angle Control via Polymer Network
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Solution Overview
Problem
Current display technologies lack effective solutions for dynamically controlling viewing angles and light transmittance in mobile devices and tablet PCs, which are essential for privacy protection and optimal image display.
Innovation Solution
A liquid crystal cell comprising a polymer network with a liquid crystal region containing a liquid crystal compound and a dichroic dye, which can be aligned to control viewing angles and light transmittance by switching between homogeneous and homeotropic alignment states in response to applied voltage, allowing for wide or narrow viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a narrow viewing angle film is used for privacy protection, then privacy protection is improved, but viewing angle flexibility is worsened
Solution Approach 1:
The patent applies a liquid crystal layer that can dynamically change its optical properties between different viewing angle states (wide and narrow) in response to applied voltage, enabling the display to switch between privacy protection mode and normal viewing mode, thus resolving the contradiction between fixed privacy protection and viewing angle flexibility
Solution Approach 2:
The liquid crystal layer changes its refractive index and molecular orientation parameters when voltage is applied, transitioning between homogeneous alignment (wide viewing angle) and homeotropic alignment (narrow viewing angle) states, allowing dynamic adjustment of viewing angle characteristics while maintaining privacy protection capabilities
2Adaptability or versatility
If viewing angle control is implemented using conventional liquid crystal cells, then viewing angle adjustment is improved, but transparency and contrast ratio are worsened
Solution Approach 1:
The patent uses a composite liquid crystal composition containing liquid crystal compounds and dichroic dyes together, where the dichroic dye enhances light absorption in specific orientations, improving contrast ratio and transparency in both wide and narrow viewing angle modes while maintaining effective viewing angle control through liquid crystal alignment changes
3Adaptability or versatility
If liquid crystal alignment is changed to control viewing angle, then viewing angle control is improved, but drive voltage requirements are worsened
Solution Approach 1:
The patent modifies the dielectric anisotropy and molecular structure parameters of the liquid crystal compounds to reduce the threshold voltage required for alignment transitions, enabling viewing angle switching at lower drive voltages while maintaining effective control over liquid crystal orientation states
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 liquid crystal cell enables flexible control of viewing angles and light transmittance, ensuring excellent transparency and contrast ratio, even when a voltage is not applied, and maintaining excellent drive voltage properties.
Implementation Method 1
alignment of the liquid crystal compound and/or the dichroic dye in the liquid crystal region is/are controlled according to a kind of the display panel
Implementation Method 2
the liquid crystal compound and/or the dichroic dye in the liquid crystal region of the liquid crystal cell may be convertable between a homogeneous alignment state and a homeotropic alignment state
Implementation Method 3
the liquid crystal compound and/or the dichroic dye in the liquid crystal region of the liquid crystal cell may be convertable between a homogeneous alignment state and a homeotropic alignment state
Implementation Method 4
The liquid crystal cell may, for example, control a viewing angle or light transmittance when a display element displays an image
Data Source
AI summary
The present application relates to a liquid crystal cell, a method for preparing a liquid crystal cell and a display device. An exemplary liquid crystal cell may be applied to various types of display devices so as to control a viewing angle or light transmittance of the display device.