Display Apparatus with Polarization Converter for Anti-Peeping
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Solution Overview
Problem
Existing display apparatuses face challenges in conveniently switching between anti-peeping modes and sharing modes with full viewing angles, as they often require manual removal and reinstallation of light control films, which is inconvenient and not user-friendly.
Innovation Solution
A display apparatus incorporating a light polarization converter with alternating regions and a viewing angle limiting device containing light-absorbing molecules with different absorption coefficients in various directions, allowing for automatic switching between anti-peeping modes and sharing modes by controlling the polarization direction of light beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light control film is placed in front of the display panel to achieve anti-peeping, then privacy protection is improved, but operational convenience deteriorates due to manual removal and reinstallation requirements
Solution Approach 1:
The patent replaces the mechanical system of manually placing and removing light control films with an optical system using a light polarization converter and viewing angle limiting device. The converter changes light polarization directions based on incident angle, and the limiting device selectively absorbs light based on polarization direction, achieving automatic anti-peeping without manual intervention.
Solution Approach 2:
The display apparatus achieves self-service anti-peeping functionality where the system automatically filters oblique light without user intervention. The light polarization converter and viewing angle limiting device work together to automatically identify and block peeping angles while maintaining normal viewing angles, eliminating the need for users to manually adjust or remove films.
2Object-affected harmful factors
If a light control film is used for anti-peeping, then privacy protection is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent merges the anti-peeping function with the display panel structure by integrating the light polarization converter and viewing angle limiting device directly onto the display panel. This integration combines multiple functions into a unified structure, reducing the need for separate external components and simplifying the overall device architecture.
Solution Approach 2:
The patent uses composite optical structures where the light polarization converter and viewing angle limiting device work together as an integrated optical system. The converter uses polarization-selective materials while the limiting device uses polarization-sensitive absorbing materials, creating a composite optical architecture that achieves anti-peeping through material properties rather than complex mechanical assemblies.
3Object-affected harmful factors
If the viewing angle limiting device has high absorption coefficient in thickness direction, then anti-peeping performance is improved, but light transmission for normal viewing is reduced
Solution Approach 1:
The patent applies local quality by making the light absorption property directional rather than uniform. The viewing angle limiting device is designed with anisotropic absorption characteristics where the absorption coefficient is high in the thickness direction for oblique light paths, but low in the lateral direction for normal viewing light paths. This allows selective filtering based on light incident angle while preserving normal viewing transmission.
Solution Approach 2:
The patent changes the optical parameters of the viewing angle limiting device by using materials with anisotropic absorption coefficients. The absorption coefficient ratio between the thickness direction and lateral direction is optimized to achieve the desired balance: high enough in the thickness direction to block oblique peeping light, but low enough in the lateral direction to maintain adequate light transmission for normal viewing angles.
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
Enables convenient and effective anti-peeping in different directions while allowing full viewing angles, enhancing user experience and operational convenience by automatically adjusting the display settings based on the polarization direction of light beams.
Implementation Method 1
Light beams passing through the first regions and the second regions respectively have a first light polarization direction and a second light polarization direction
Implementation Method 2
The light-absorbing molecules have a first absorption coefficient in a thickness direction of the viewing angle limiting device and a second absorption coefficient in a direction perpendicular to the thickness direction
Implementation Method 3
A ratio of the first absorption coefficient to the second absorption coefficient is greater than 1
Data Source
AI summary
A display apparatus is provided, including at least one viewing angle limiting device, a display panel, and a light polarization converter disposed between the at least one viewing angle limiting device and the display panel. The light polarization converter includes first regions and second regions alternately arranged. Light beams passing through the first regions and the second regions respectively have a first light polarization direction and a second light polarization direction. The light polarization converter is overlapped with the at least one viewing angle limiting device and the display panel. The viewing angle limiting device includes light-absorbing molecules. The light-absorbing molecules have a first absorption coefficient in a thickness direction of the viewing angle limiting device and a second absorption coefficient in a direction perpendicular to the thickness direction. A ratio of the first absorption coefficient to the second absorption coefficient is greater than 1.