Transparent Display Filter Layout for Backside Light Leakage
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Solution Overview
Problem
Transparent display apparatuses face a backside light leakage issue due to image beams being reflected back into the display and passing out from the back, which affects the display's transparency and functionality.
Innovation Solution
A transparent display apparatus is designed with a first transparent substrate, light-emitting elements for emitting color lights, and a frequency band blocking filter. The filter has blocking bands corresponding to the color lights, with Full Width at Half Maximum (FWHM) ranges of 15 nm to 55 nm, to prevent light leakage from the backside.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent display apparatus uses light-emitting elements to emit image beams, then the display area can provide a display screen for users, but a portion of the image beam is reflected back into the transparent display apparatus and passes out from the back, causing backside light leakage
Solution Approach 1:
The patent introduces a frequency band blocking filter as an intermediary component positioned between the light-emitting elements and the external environment. This filter selectively blocks reflected image beams from passing through the transparent display apparatus backside while allowing other light to pass through, thereby resolving the backside light leakage issue without compromising the display function
Solution Approach 2:
The patent applies parameter changes by specifying that the frequency band blocking filter has blocking bands with Full Width at Half Maximum (FWHM) values ranging from 15 nm to 55 nm. This precise parameter control enables the filter to effectively block reflected light frequencies while maintaining high transmittance (at least 60%) for other wavelengths, thus eliminating backside light leakage while preserving display quality
2Object-generated harmful factors
If a frequency band blocking filter is added to suppress backside light leakage, then light leakage is reduced, but the device structure becomes more complex
Solution Approach 1:
The frequency band blocking filter is designed to perform multiple functions simultaneously: it blocks reflected image beams to prevent backside light leakage, maintains high transmittance for user viewing, and preserves the transparent display apparatus's overall transparency. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
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 effectively suppresses backside light leakage while maintaining a high transmittance of at least 60%, thereby enhancing the transparency and display quality of the apparatus.
Implementation Method 1
The first frequency band blocking filter has a first blocking band, a second blocking band, and a third blocking band respectively corresponding to the first color light, the second color light, and the third color light
Implementation Method 2
The first light-emitting element, the second light-emitting element, and the third light-emitting element are disposed at the first display area and respectively used for emitting a first color light, a second color light, and a third color light
Implementation Method 3
The first transparent substrate has a first display area and a first transparent area outside the first display area
Data Source
AI summary
A transparent display apparatus includes a first transparent substrate, first to third light-emitting elements, and a first frequency band blocking filter. The first transparent substrate has a first display area and a first transparent area outside the first display area. The first to third light-emitting elements are disposed at the first display area and respectively used for emitting first to third color lights. The first frequency band blocking filter is disposed on a transmission path of the first to third color lights. The first frequency band blocking filter has first to third blocking bands respectively corresponding to the first to third color lights. FWHM of the first to third blocking bands fall in a range of 15 nm to 55 nm.