Transmittable Lighting Device Using Twisted Liquid Crystal Polarization
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Solution Overview
Problem
Conventional transmittable lighting devices suffer from low transparency, interference from ambient light affecting image quality, and increased manufacturing complexity due to integrated polarizers and light guides.
Innovation Solution
A transmittable lighting device comprising two substrates with a 90-degree twisted liquid crystal layer and polarizers, allowing switching between transmittable and lighting states by adjusting the electric field, thereby eliminating the need for additional optical components and enhancing light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizer and light guiding plate are integrated into the liquid crystal panel to generate linearly polarized light, then the panel can display images, but the transparency of the panel decreases and the light intensity gradually decreases
Solution Approach 1:
The invention separates the polarizer from the liquid crystal panel structure, placing it externally rather than integrating it into the panel. This segmentation allows the panel to maintain its original transparency while still achieving polarization functionality through the external polarizer, thus resolving the contradiction between light intensity and device complexity.
Solution Approach 2:
The invention changes the dimensional arrangement by positioning the polarizer in a different spatial dimension relative to the panel - specifically, placing it at an angle to the panel surface rather than integrating it within the panel layers. This dimensional repositioning enables light polarization without compromising panel transparency or increasing structural complexity.
2Ease of manufacture
If ambient light passes through the panel to allow visibility of rear objects, then the panel maintains transparency, but the image quality deteriorates due to interference from penetrating ambient light
Solution Approach 1:
The invention introduces an external polarizer as an intermediary component between the ambient light and the liquid crystal panel. This intermediary selectively filters polarized components of ambient light, reducing interference with displayed images while maintaining the panel's transparency and visibility functions, thus resolving the contradiction between manufacturing simplicity and image quality.
3Ease of operation
If the polarizer and light guide are integrated into the liquid crystal panel, then the lighting function is achieved, but the manufacturing difficulty and cost increase
Solution Approach 1:
The invention segments the polarization function from the panel assembly, using an external polarizer that can be independently manufactured and positioned. This separation simplifies the manufacturing process by allowing each component to be produced separately using standard techniques, avoiding the complex integration required by conventional approaches while maintaining operational effectiveness.
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 device effectively reduces ambient light interference, improves light utilization, and simplifies the structure by allowing easy switching between states, enhancing image quality and display functionality.
Implementation Method 1
Each of the plurality of liquid crystal molecule is arranged along the alignment direction of the substrate nearby, and the plurality of liquid crystal molecules is arranged in a 90-degree twisted arrangement
Implementation Method 2
An ambient light passes through one of the polarizers and the plurality of liquid crystal molecules in a 90-degree twisted arrangement so as to be polarized by 90 degrees
Implementation Method 3
When the electric field is provided between the two substrates, the plurality of liquid crystal molecules is chaotically arranged, and the lateral light is scattered by the plurality of liquid crystal molecules
Data Source
AI summary
A transmittable lighting device is provided. The transmittable lighting device includes two substrates, a transmittable layer, two polarizers and a light source. The two substrates are respectively electrically connected to a voltage supply. A switchable electric field is provided between the two substrates, and two alignment directions of the two substrates are orthogonal to each other. The transmittable layer is located between the two substrates and has a plurality of liquid crystal molecules. Each of the plurality of liquid crystal molecule is arranged along the alignment direction of the substrate nearby, and the plurality of liquid crystal molecules is arranged in a 90-degree twisted arrangement. The two polarizers are located at two outer surfaces of the two substrates, respectively. Each polarizer has a polarization direction parallel to the alignment direction of the substrate on the same outer surface. The light source emits a lateral light entering the transmittable layer laterally.