Projection Screen Ultraviolet Activation for High-Contrast Glass Display
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current projection technologies face challenges in displaying clear and high-contrast images on glass doors and windows due to the light-transmitting nature of these materials, with existing solutions like diffusion films, hologram films, transparent liquid crystal displays, and liquid crystal dimming glass having limitations such as altering the original light transmission characteristics, limited angle of view, low light transmission, and high costs.
Innovation Solution
A projection system that includes a first illumination system for emitting an illumination beam, a second illumination system for emitting an ultraviolet beam, a first light valve for converting the illumination beam into a visible image beam, and a lens for projecting both beams onto a projection screen, where the ultraviolet beam changes the screen's ultraviolet absorption layer from transparent to opaque, allowing for a clear and high-contrast image frame to be displayed on a black opaque area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diffusion film is provided on light-transmitting material to enable projection, then projection capability is improved, but original light-transmitting characteristics are destroyed and rear environmental image is shielded
Solution Approach 1:
The projection system is divided into two independent subsystems: a visible light projection system for displaying images and an ultraviolet activation system for controlling screen transparency. This segmentation allows each subsystem to function independently without interfering with the other, preserving the light-transmitting characteristics when projection is not needed while enabling projection capability when required.
Solution Approach 2:
An ultraviolet-absorbing material is introduced as an intermediary layer on the projection screen. This layer acts as a mediator that responds to ultraviolet light by changing from transparent to opaque state, thereby enabling projection on light-transmitting surfaces without permanently altering their light-transmitting properties. The intermediary layer can be switched between transparent and opaque states as needed.
2Reliability
If hologram film is used for projection on light-transmitting material, then projection capability is improved, but angle of view is limited to specific angle
Solution Approach 1:
The invention changes the optical parameter of the projection screen dynamically by using ultraviolet-absorbing material that transitions between transparent and opaque states. This parameter change enables the screen to adapt to different viewing conditions and angles, overcoming the fixed angle of view limitation of hologram films while maintaining projection capability.
3Reliability
If transparent liquid crystal display architecture is used, then projection capability is improved, but light transmission is reduced
Solution Approach 1:
The ultraviolet-absorbing material on the projection screen undergoes periodic state changes between transparent and opaque in response to ultraviolet light activation. During projection, the material becomes opaque to block ambient light and enhance image contrast. When projection is not needed, the material returns to transparent state to allow full light transmission, thus avoiding the continuous light transmission reduction caused by transparent liquid crystal displays.
4Reliability
If liquid crystal dimming glass architecture is used, then projection capability is improved, but cost increases significantly
Solution Approach 1:
The invention replaces expensive liquid crystal dimming glass with a more cost-effective solution using ultraviolet-absorbing material that can be applied as a coating or layer on the projection screen. This material can be activated temporarily with ultraviolet light to enable projection, then returns to transparent state, providing the same functionality at a lower cost without requiring complex liquid crystal structures.
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 the projection of clear and high-contrast image frames on glass surfaces by converting the projection screen from transparent to opaque, enhancing image clarity and contrast while maintaining the original light transmission characteristics and avoiding the limitations of existing solutions.
Implementation Method 1
a first light valve located on a transmission path of the illumination beam and for converting the illumination beam into a visible image beam
Implementation Method 2
the ultraviolet absorption layer of the projection screen receives the ultraviolet beam and is changed from the transparent state to the opaque state
Implementation Method 3
a lens located on a transmission path of the visible image beam and the ultraviolet beam. The lens is for projecting the visible image beam onto the projection screen to form an image frame area
Data Source
AI summary
A projection device for forming an image frame on a projection screen includes a first illumination system for emitting an illumination beam, a second illumination system for emitting an ultraviolet beam, a first light valve located on a transmission path of the illumination beam and for converting the illumination beam into a visible image beam, a lens located on a transmission path of the visible image beam and the ultraviolet beam and for projecting the visible image beam onto the projection screen to form an image frame area and projecting the ultraviolet beam onto the projection screen to form an opaque area, and a processor electrically connected to the first illumination system and the second illumination system and for controlling the first illumination system to emit the illumination beam and controlling the second illumination system to emit the ultraviolet beam. The image frame area partially overlaps the opaque area.