See-through Display Light Guide Scratch Protection
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Solution Overview
Problem
Existing see-through displays face issues with reduced visibility due to bright spots caused by scratches and stains on exposed light guiding plates, and increased production costs associated with reflective polarizers in existing solutions.
Innovation Solution
An image display device with a transparent medium, such as glass, on the rear side, equipped with a protective coating or film to prevent scratches and stains, and an anti-reflective or reflective polarizing layer to manage light transmission and reflection, thereby maintaining visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light guiding plate is exposed to the outside, then the device structure is simplified, but the light guiding plate becomes susceptible to scratches and stains causing bright spots that reduce visibility
Solution Approach 1:
A transparent medium is introduced as an intermediary component between the external environment and the light guiding plate. This mediator protects the light guiding plate from scratches and stains while maintaining optical transparency, thus preventing bright spots without significantly complicating the device structure
Solution Approach 2:
The patent uses a composite structure combining the transparent medium with the light guiding plate. The transparent medium (such as glass or transparent resin) is combined with the light guiding plate to create a protected composite structure that maintains both simplicity and reliability
2Reliability
If the light guiding plate is not exposed to the outside, then visibility is maintained, but the device structure becomes more complex and production cost increases due to the need for reflective polarizer
Solution Approach 1:
The invention extracts and removes the reflective polarizer from the device structure while maintaining visibility through the transparent medium. This simplifies the device structure and reduces production cost while still preventing bright spots through the transparent medium protection approach
3Duration of action of stationary object
If transparent medium is added to protect light guiding plate, then durability is enhanced, but device structure becomes more complex
Solution Approach 1:
The transparent medium is implemented as a thin film or plate structure that provides protection without adding significant structural complexity. The thin film approach maintains simplicity while enhancing durability against scratches and stains
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 prevents bright spots from occurring and reduces production costs by enhancing the durability and transparency of the display, while minimizing glare and unnecessary light transmission.
Implementation Method 1
a light guide configured to emit the source light received from the light source from a predetermined surface; an image display portion capable of displaying an image by transmitting the source light emitted by the light guide
Implementation Method 2
a protective portion provided on a surface of the transparent medium that is located on the rear side; the protective portion is a hard coating film affixed to the surface of the transparent medium or a hard coating layer formed on the surface
Implementation Method 3
an anti-reflective portion provided on a surface of the transparent medium, either on the rear side or the front side, or both surfaces of the transparent medium
Implementation Method 4
a reflective polarizing portion provided on a surface of the transparent medium, either on the rear side or the front side, or both surfaces of the transparent medium
Data Source
AI summary
Provided is an image display device with a see-through type display capable of inhibiting the reduction of the visibility of a background seen through a screen due to light emission from bright spots resulting from scratches and stains on a light guiding plate. In this image display device, a liquid crystal panel 30, a light guiding plate 45 with a light source 40 attached thereto, and a transparent plate 20 are disposed, from the display surface (front) side to the rear side, so as to be parallel to one another, and therefore, the surface of the light guiding plate 45 is inhibited from being scratched or stained by the transparent plate 20. Thus, the visibility of the image display device 100 is prevented from being reduced by bright spots.