Transparent Display Privacy via Subpixel Segmentation
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Solution Overview
Problem
Transparent display devices lack privacy protection, as images displayed on them can be viewed by individuals behind the device, potentially revealing sensitive information.
Innovation Solution
A transparent display device design featuring a substrate with subpixels, electrodes, a light emitting layer, and color filters, where a lower conversion layer shields light from the substrate, preventing viewers behind the device from seeing the image while allowing those in front to view both objects and images displayed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transparent display device is used to display images, then information display function is achieved, but privacy is compromised as images can be viewed from behind the device
Solution Approach 1:
The display device is divided into multiple subpixels (red, green, blue) arranged in a matrix, with each subpixel independently controllable. This segmentation allows precise control of light emission at the pixel level, enabling the display to show images to front viewers while blocking light transmission to rear viewers through coordinated subpixel control
Solution Approach 2:
Different regions of the display have different optical properties. The color conversion layer and color filter are positioned at specific locations to create directional light transmission characteristics. The lower color conversion layer is placed between the substrate and first electrode to selectively convert light wavelengths, creating different transparency characteristics for front and rear viewers
2Object-affected harmful factors
If a lower color conversion layer is added to block light from reaching the substrate, then privacy protection is improved, but device complexity increases
Solution Approach 1:
Multiple functional layers are combined into a single integrated structure. The lower color conversion layer is integrated between the substrate and first electrode, merging light conversion functionality with the existing display structure. The color filter is positioned at the upper portion, combining color selection with the light emission path, thereby achieving privacy protection without significantly increasing overall device complexity
Solution Approach 2:
The display employs composite material structures including the lower color conversion layer made of light-converting materials and the upper color filter made of wavelength-selective materials. These composite layers work together to achieve directional light transmission, blocking rear viewing while maintaining front viewing clarity, thus providing privacy protection through material composition rather than complex mechanical 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
Ensures that only the intended viewer in front can see the image displayed, maintaining privacy by blocking the view of individuals behind the device, thus preventing information leakage.
Implementation Method 1
a lower color conversion layer provided between the substrate and the first electrode, wherein the lower conversion layer is provided between the substrate and the first electrode, whereby light emitted from the light emitting layer is shielded from progressing to the substrate
Implementation Method 2
an upper color filter provided on the second electrode, and a lower color filter provided between the substrate and the lower color conversion layer
Data Source
AI summary
A transparent display device for providing only a viewer located at the front with an image is disclosed. The transparent display device comprises a substrate provided with a first subpixel, a second subpixel and a third subpixel, a first electrode provided in each of the first subpixel, the second subpixel and the third subpixel on the substrate, a light emitting layer provided on the first electrode, a second electrode provided on the light emitting layer, an upper color filter provided over the second electrode, a lower color conversion layer provided between the substrate and the first electrode, and a lower color filter provided between the substrate and the lower color conversion layer.