Viewing Angle Limiting Device with Anisotropic Dye Molecules
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Solution Overview
Problem
Existing display devices with wide viewing angles pose a risk of confidential information leakage, as they lack convenient and effective anti-peep functionality, requiring manual adjustment of light control films which is operationally inconvenient.
Innovation Solution
A viewing angle limiting device with a polymer substrate and dispersed dye molecules, where the dye molecules have distinct absorption coefficients in different directions, enhancing filtering effects and light transmittance, integrated with an electronically controlled switch for adjustable anti-peep performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light control film is placed in front of the display panel to filter large-angle light beams, then anti-peep effect is improved, but operation convenience deteriorates due to manual adjustment requirement
Solution Approach 1:
The liquid crystal molecules automatically adjust the light control film's orientation in response to external stimuli (magnetic field or voltage), enabling the system to self-regulate between wide viewing angle mode and anti-peep mode without manual intervention. The material performs the adjustment function autonomously based on environmental conditions.
Solution Approach 2:
The light control film transitions from a static structure requiring manual movement to a dynamic system that can automatically change its optical properties. The liquid crystal molecules reorient themselves under external control, dynamically adjusting the filtering characteristics of the film to switch between different viewing modes.
2Object-affected harmful factors
If dye molecules are arranged to enhance viewing angle filtering effect, then anti-peep performance is improved, but light transmittance in viewing angle direction deteriorates
Solution Approach 1:
The dye molecules exhibit direction-dependent absorption properties, with high absorption coefficients for oblique incident light (providing strong filtering effect) and low absorption coefficients for normal incident light (maintaining high transmittance). This anisotropic local quality allows the same material to simultaneously achieve both filtering and transmittance requirements in different spatial directions.
Solution Approach 2:
The optical properties of the dye molecules are asymmetric with respect to the incident angle of light. The absorption coefficient varies significantly between different directions: high for large-angle incident light and low for small-angle incident light. This asymmetric response enables the material to differentiate between viewing angles and selectively filter light based on direction.
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 provides enhanced anti-peep performance and improved light transmittance, allowing for convenient switching between viewing modes while maintaining high brightness across various angles, thus addressing the leakage risk and operational inconvenience of existing systems.
Implementation Method 1
The dye molecules have a first absorption coefficient in a thickness direction of the polymer substrate. The dye molecules have a second absorption coefficient in a direction perpendicular to the thickness direction, and a ratio of the first absorption coefficient to the second absorption coefficient is between 10 and 1000.
Implementation Method 2
The dye molecules have distinct absorption coefficients in different directions, enhancing filtering effects and light transmittance
Implementation Method 3
The liquid crystal mixed material layer is cured to cause a polymerization reaction of a plurality of reactive monomers to form a polymer substrate
Data Source
AI summary
A viewing angle limiting device, including a polymer substrate and a plurality of dye molecules, is provided. The dye molecules are dispersedly arranged in the polymer substrate. The dye molecules have a first absorption coefficient in a thickness direction of the polymer substrate. The dye molecules have a second absorption coefficient in a direction perpendicular to the thickness direction. A ratio of the first absorption coefficient to the second absorption coefficient is between 10 and 1000. A manufacturing method of the viewing angle limiting device and a display device including the viewing angle limiting device are also provided. The display device, the viewing angle limiting device, and the manufacturing method thereof provided by the invention have a large viewing angle filtering effect and have higher light transmittance in a viewing angle direction.