Transparent Display Light-Shielding Layout for Backside Leakage
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Solution Overview
Problem
Transparent display devices suffer from backside light leakage due to image beams being reflected back into the device and passing through the rear surface, which affects the clarity and visibility of the display.
Innovation Solution
The transparent display device incorporates a driving backplane with a light-emitting element, a series of planarization and light-shielding layers, a molding substrate, and optical clear adhesion to manage light emission and minimize backside light leakage. The light-shielding layers have strategically designed openings to overlap with the light-emitting elements, controlling light beams and reducing reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent display device uses a display area with pixels to emit image beams, then the display screen can be provided for users to view, but part of the image beam will be reflected back into the transparent display device and pass through the rear surface, causing backside light leakage
Solution Approach 1:
The patent divides the display device into multiple functional layers including a driving backplane, light-emitting elements, planarization layers, light-shielding layers with openings, and a molding substrate. This segmentation allows the light-shielding layers to specifically block reflected light paths while preserving light emission through the openings, thereby solving the backside light leakage problem without compromising display functionality
Solution Approach 2:
The patent introduces light-shielding layers with strategically designed openings as intermediary elements between the light-emitting elements and the external environment. These light-shielding layers act as mediators that selectively block reflected image beams from reaching the rear surface while allowing forward-emitted light to pass through, thus eliminating backside light leakage without affecting the display screen's visibility
2Adaptability or versatility
If the transparent display device allows users to view the scene behind it through the transparent area, then transparency is maintained, but the reflected light from the display surface reduces the clarity of both the display and the transparent view
Solution Approach 1:
The patent applies local quality by making different layers have different optical properties. The light-shielding layers have openings positioned to allow light transmission in the transparent area while blocking reflected light paths. This localized differentiation in optical properties across different regions and layers enhances display clarity without compromising the transparent display state
Solution Approach 2:
The patent addresses the light reflection problem by introducing additional dimensional considerations through multiple stacked layers with specific opening patterns. The light-shielding layers are positioned at different heights and have openings arranged to control light paths in three-dimensional space, thereby blocking reflected light while maintaining transparency and clarity
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
This configuration effectively suppresses backside light leakage, enhances light extraction efficiency, and narrows the viewing angle, thereby improving the overall clarity and visibility of the transparent display device.
Implementation Method 1
The first light-shielding layer is disposed on the first planarization layer and has a first opening. The first opening at least partially overlaps the light-emitting element. The second light-shielding layer is disposed on the second planarization layer and has a second opening. The second opening at least partially overlaps the first opening.
Data Source
AI summary
A transparent display device includes a driving backplane, a light-emitting element, a first planarization layer, a first light-shielding layer, a second planarization layer and a second light-shielding layer. The light-emitting element is disposed on the driving backplane. The first planarization layer covers the light-emitting element. The first light-shielding layer is disposed on the first planarization layer and has a first opening. The first opening at least partially overlaps the light-emitting element. The second planarization layer covers the first light-shielding layer. The second light-shielding layer is disposed on the second planarization layer and has a second opening. The second opening at least partially overlaps the first opening.