Transparent LCD with Dichroic Dye for Visibility and Clarity
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Solution Overview
Problem
Current transparent liquid crystal display devices face challenges in improving visibility of objects behind them and clarity of displayed images, while also maintaining high brightness and reliability.
Innovation Solution
A transparent liquid crystal display device is designed with first and second substrates spaced apart, featuring a polarizing plate on one substrate, electrodes and a passivation layer on the inner surface of the first substrate, a third electrode on the second substrate, and a liquid crystal layer containing black dichroic dye material, allowing for a guest-host mode operation that adjusts electric fields to achieve transparent, color, and dark states, enhancing visibility and image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent liquid crystal display device is designed to transmit object images from the opposite side, then visibility of the opposite object is improved, but the clarity of the displayed image deteriorates
Solution Approach 1:
The patent employs dichroic dye materials that change their optical properties based on the alignment state of liquid crystal molecules. In the transparent state, the dichroic dye allows transmission of object images from the opposite side. When voltage is applied and liquid crystal molecules align, the dichroic dye absorbs light to display clear images with high contrast, thus achieving both transparency and image clarity through color/optical property changes
Solution Approach 2:
The patent utilizes changes in the alignment direction parameter of liquid crystal molecules to switch between transparent and display states. By controlling the electric field strength and duration, the liquid crystal molecules can be aligned or randomised, which changes the optical transmission parameter of the dichroic dye material, enabling the device to switch between high visibility and high image clarity modes
2Illumination intensity
If the liquid crystal layer uses conventional materials, then the device structure is simple, but brightness and color reproducibility are insufficient
Solution Approach 1:
The patent creates a composite liquid crystal layer by combining conventional liquid crystal materials with dichroic dye materials. This composite structure enhances brightness and color reproducibility by leveraging the light-absorbing properties of the dichroic dye while maintaining the switching capability of the liquid crystal molecules, achieving superior display performance without excessive structural complexity
3Reliability
If the liquid crystal layer uses conventional materials, then the device structure is simple, but reliability deteriorates due to insufficient light absorption
Solution Approach 1:
The dichroic dye material in the liquid crystal layer provides strong light absorption when liquid crystal molecules are aligned, ensuring reliable image display with high contrast. The dye's selective light absorption properties maintain consistent performance across different operating conditions, enhancing reliability while adding minimal complexity to the liquid crystal layer structure
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 improves visibility of objects behind the display and clarity of images by optimizing light transmission and absorption, reducing light loss, and increasing brightness and color reproducibility, while maintaining a thin profile and durable color filters.
Implementation Method 1
the liquid crystal layer including a liquid crystal material and a black dichroic dye material
Implementation Method 2
a liquid crystal layer between the first and second substrate, the liquid crystal layer including a liquid crystal material and a black dichroic dye material
Implementation Method 3
a polarizing plate over an outer surface of the first substrate
Implementation Method 4
first and second electrodes and a passivation layer between the first and second electrodes over an inner surface of the first substrate
Data Source
AI summary
A transparent liquid crystal display device includes: first and second substrates facing and spaced apart from each other; a polarizing plate over an outer surface of the first substrate; first and second electrodes and a passivation layer between the first and second electrodes over an inner surface of the first substrate, the first electrode having a plate shape, the second electrode having a shape of bars; a third electrode over an inner surface of the second substrate; at least one color filter over an outer surface of the second substrate, the at least one color filter including a colored dichroic dye material; and a liquid crystal layer between the first and second substrate, the liquid crystal layer including a liquid crystal material and a black dichroic dye material.