Electrophoretic Privacy Layer for Low-Reflection Display Panels
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Solution Overview
Problem
OLED display panels suffer from high ambient light reflection and susceptibility to screen peeping, with existing solutions like polarizers and black matrices either diminishing brightness or increasing thickness and weight, and failing to adequately adjust anti-peeping viewing angles.
Innovation Solution
An electrophoretic element with a transparent cell body and reflective structures that utilize electrophoretic particles to reflect light under an electric field, providing privacy protection by altering the viewing angle and eliminating the need for additional light-shielding layers, while maintaining brightness and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polarizers are added to reduce ambient light reflection, then privacy protection is improved, but screen brightness is diminished
Solution Approach 1:
The patent employs electrophoretic particles that can dynamically change their orientation and aggregation state in response to electric fields. In the privacy protection state, particles aggregate to scatter and reflect ambient light. In the display state, particles disperse to allow light transmission, thus dynamically adjusting optical properties without permanently reducing brightness.
Solution Approach 2:
The patent changes the optical parameters of the electrophoretic particle layer by controlling particle aggregation and orientation through electric field application. By adjusting the aggregation degree and orientation of particles, the layer can switch between high reflectivity (privacy mode) and high transmittivity (display mode), resolving the contradiction between privacy protection and brightness maintenance.
2Object-affected harmful factors
If black matrices are added to prevent screen peeping, then privacy protection is improved, but device thickness and weight increase
Solution Approach 1:
The patent replaces the mechanical approach of adding physical black matrix layers with an electrophoretic system that uses electric field-controlled particle behavior. The electrophoretic particles provide privacy protection through optical scattering and reflection when aggregated, eliminating the need for additional mechanical light-shielding layers and reducing overall device weight.
Solution Approach 2:
The electrophoretic particle layer serves multiple functions: it provides privacy protection when particles aggregate, allows light transmission when particles disperse, and can be controlled by electric fields. This multi-functionality replaces the need for separate black matrix layers and other optical components, reducing device complexity and weight.
3Object-affected harmful factors
If additional light-shielding layers are added to improve privacy, then anti-peeping performance is improved, but device complexity increases
Solution Approach 1:
The patent merges the privacy protection function with the existing electrophoretic display structure. The electrophoretic particles themselves provide both display functionality and privacy protection through their aggregation and orientation behavior, eliminating the need for separate light-shielding layers and reducing structural complexity.
Solution Approach 2:
The electrophoretic particle layer serves as a multi-functional component that provides both display operation and privacy protection. By controlling particle aggregation and orientation through electric fields, the same layer performs multiple functions that would otherwise require separate components, simplifying the overall device structure.
4Object-affected harmful factors
If electrophoretic particle layer is used to reflect light, then privacy protection is improved, but light transmission is reduced
Solution Approach 1:
The electrophoretic particle layer dynamically adjusts its optical properties by changing particle aggregation and orientation in response to electric fields. When privacy protection is needed, particles aggregate to reflect ambient light. When display visibility is needed, particles disperse to maximize light transmission, thus dynamically balancing privacy protection and light transmission requirements.
Solution Approach 2:
The patent changes the optical parameters of the electrophoretic particle layer by controlling particle aggregation degree and orientation through electric field application. This allows the system to switch between high reflectivity state (for privacy) and high transmittivity state (for display), resolving the contradiction between privacy protection and light transmission.
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
Enhances privacy protection by adjusting viewing angles, improves light efficiency, and reduces power consumption by utilizing both ambient and pixel light, without the need for additional light-shielding layers, thus improving display performance and aperture ratio.
Implementation Method 1
The electrophoretic particle layer is configured to move between the first surface and the second surface under an electric field applied to the electrophoretic element
Implementation Method 2
The electrophoretic particle layer is configured to move between the first surface and the second surface, and to reflect light, under an electric field applied to the electrophoretic element
Data Source
AI summary
An electrophoretic element, a display panel, and a display device are provided. The electrophoretic element is for the display panel and includes an electrophoretic cell, a first reflective structure, and a second reflective structure. The electrophoretic cell includes a cell body and an electrophoretic particle layer. The electrophoretic particle layer is disposed within the cell body, the cell body has a first surface and a second surface opposite the first surface, and the cell body is transparent. The first reflective structure is disposed on the first surface. The first reflective structure has a first reflective surface facing the electrophoretic cell. The second reflective structure is disposed on the second surface. The second reflective structure has a second reflective surface facing the electrophoretic cell. The electrophoretic particle layer is configured to move between the first surface and the second surface under an electric field.