Privacy Display Panel Using Segmented Wave Plates
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Solution Overview
Problem
Conventional privacy-preserving display panels suffer from a dark state and low grayscale brightness, leading to a severely reduced contrast ratio and display effect, making them unsuitable for protecting private information in public settings.
Innovation Solution
A display panel configuration comprising a display panel body, a first polarizer on the non-display side, and a (½N+¼) wave plate on the display side, paired with glasses containing a second polarizer and second wave plate, which converts circularly polarized light to linearly polarized light for image presentation, ensuring low brightness and high contrast ratio while preventing peeping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional privacy-preserving display panel is used, then privacy protection is achieved, but the dark state and low grayscale become very bright, severely reducing the contrast ratio and display effect
Solution Approach 1:
The patent divides the display system into two separate components: a display panel without privacy protection features and a pair of glasses with privacy protection features. This segmentation allows the display panel to maintain excellent display performance while the glasses provide the privacy protection function, avoiding the compromise inherent in integrated conventional privacy-preserving displays.
Solution Approach 2:
The pair of glasses acts as an intermediary device that adds privacy protection functionality to the display system. The glasses contain the second polarizer and second wave plate, which process the light from the display panel to achieve privacy protection without affecting the original display quality.
2Object-affected harmful factors
If a conventional privacy-preserving display panel is used, then privacy protection is achieved, but the contrast ratio is severely reduced
Solution Approach 1:
By separating the privacy protection function into the glasses, the display panel can maintain its native high contrast ratio performance. The segmentation ensures that the display panel's optical stack remains optimized for image quality while the glasses handle the privacy protection.
Solution Approach 2:
The patent uses a (1/2N+1/4) wave plate instead of conventional wave plates, which changes the optical parameters to achieve better performance. This parameter change in the wave plate design helps maintain the contrast ratio while achieving the desired privacy protection effect.
3Illumination intensity
If a (1/2N+1/4) wave plate is used in the display panel, then display quality is maintained, but the system complexity increases
Solution Approach 1:
The patent places the complex (1/2N+1/4) wave plate configuration in the glasses rather than the display panel. This intermediary approach allows the advanced optical design to be implemented in the wearable component, keeping the display panel simple and maintaining display quality while managing system 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 maintains low brightness and high contrast ratio, allowing only the user to view images clearly while protecting private information, even if the glasses are skewed or shifted, thus enhancing privacy protection.
Implementation Method 1
The first wave plate is a (1/2N+1/4) wave plate... a light emitted by the display panel is converted into a circularly polarized light after passing through the first wave plate
Implementation Method 2
the circularly polarized light is converted into a linearly polarized light by the second wave plate of the pair of glasses
Implementation Method 3
a first polarizer disposed on a non-display side of the display panel body... A light emitted by the display panel is converted into a circularly polarized light after passing through the first wave plate
Data Source
AI summary
A display system includes a display panel and a pair of glasses. The display panel includes a display panel body, a first polarizer disposed on a non-display side of the display panel body, and a first wave plate disposed on a display side of the display panel body. The display side is opposite to the non-display side. The pair of glasses includes a second polarizer and a second wave plate. The second polarizer includes a polarizing layer. The second wave plate is disposed on a side of the polarizing layer away from eyes. The pair of glasses is configured to present images displayed by the display panel.