Transparent Display Screen with Dynamic Light Scattering Control
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Solution Overview
Problem
Large-scale liquid crystal display devices face challenges in achieving a balance between transparency and light scattering, making them unsuitable for outdoor use in direct sunlight and limiting their installation in public spaces, as existing solutions either obscure the background or fail to provide clear visibility of projected images.
Innovation Solution
A display system comprising a transparent screen with a polymer-dispersed liquid crystal layer that can switch between transparent and scattering states, controlled by a controller to adjust the light scattering degree of specific areas, allowing for clear image projection while maintaining background visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-scattering substance is mixed with a transparent base material to create a transparent display screen, then the screen achieves a certain degree of transparency, but the light scattering degree decreases making the projected video difficult to see
Solution Approach 1:
The patent applies a liquid crystal layer that can dynamically change its light scattering properties based on applied voltage. When voltage is applied, the liquid crystal molecules align and the screen becomes transparent; when voltage is removed, the molecules return to a disordered state and the screen scatters light. This dynamic switching capability allows the screen to adapt between transparency and light scattering modes, resolving the contradiction between these two opposing requirements.
Solution Approach 2:
The patent changes the physical state and optical parameters of the liquid crystal material through voltage control. By adjusting the electrical parameter (voltage), the optical parameters (light scattering degree, transparency) of the screen are changed. This allows the same material to exhibit different optical properties as needed, enabling both high transparency and high light scattering performance at different times.
2Reliability
If the light scattering degree is increased to make the projected image clearly visible, then the transparency of the screen decreases, making it unsuitable for outdoor use in direct sunlight
Solution Approach 1:
The liquid crystal layer provides dynamic control over light scattering, allowing the screen to switch between transparent and light-scattering states. This enables the screen to maintain high transparency during daytime outdoor use while providing sufficient light scattering for clear image visibility when needed, such as during nighttime or indoor presentations.
Solution Approach 2:
By changing the electrical parameter (voltage) applied to the liquid crystal layer, the optical parameters of the screen are adjusted. This allows optimization of both transparency and light scattering performance depending on the operating conditions, enabling outdoor use in direct sunlight while maintaining image visibility.
3Reliability
If a large-scale liquid crystal display device is installed to provide clear display in direct sunlight, then the display quality improves, but the display surface occupies a very large area giving a feeling of oppression
Solution Approach 1:
The patent uses a thin-film liquid crystal layer that can be applied to existing glass surfaces or screens. This thin film technology allows large-area displays to be created without the bulk and structural complexity of traditional large-scale liquid crystal display devices, reducing the perceived occupation of space while maintaining display quality.
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
Enables clear image projection and background visibility, even in bright outdoor conditions, by dynamically controlling the light scattering degree of the screen, thus improving display quality and flexibility in installation locations.
Implementation Method 1
a polymer-dispersed liquid crystal layer that can switch between transparent and scattering states
Implementation Method 2
switch between transparent and scattering states, controlled by a controller to adjust the light scattering degree
Implementation Method 3
controlled by a controller to adjust the light scattering degree of specific areas
Data Source
AI summary
According to one embodiment, a display system includes a transparent screen that is capable of switching a light scattering degree, a projector, and a controller that controls interlocking driving of the projector and the screen. The controller drives the screen and controls a light scattering degree of at least part of an area, of the screen, in which the image is projected during a period in which the projector is driven and an image is projected on the screen.