Pixel Light-Path Control for Switchable Privacy Displays
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Solution Overview
Problem
Existing display devices face challenges in limiting viewing angles to ensure privacy and compliance with safety regulations, particularly in environments where information protection is crucial.
Innovation Solution
A display device with a pixel structure that includes a pixel driving circuit, first- and second-type light-emitting elements, and a light path control layer to control light paths, allowing operation in multiple modes with adjustable viewing angles, including a privacy mode with reduced visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the viewing angle is limited to protect privacy and ensure compliance with safety regulations, then information protection is improved, but the display functionality and usability are worsened
Solution Approach 1:
The display device incorporates a switching mechanism that allows dynamic adjustment between normal mode and privacy mode. In normal mode, the display operates with standard viewing angles for full functionality. In privacy mode, a light-blocking layer is activated to restrict light paths, limiting the viewing angle to protect information. This dynamic switching resolves the contradiction by allowing the system to adapt its viewing characteristics based on operational requirements.
Solution Approach 2:
A light-path controlling layer is introduced as an intermediary component between the light-emitting elements and the external environment. This layer includes light-blocking structures (such as barrier ribs or polarizing films) that can be activated to restrict light paths. The intermediary layer enables selective light blocking without affecting the light-emitting elements themselves, allowing privacy protection while maintaining display functionality when not in privacy mode.
2Loss of information
If a light path control layer is added to restrict viewing angles, then privacy protection is improved, but device complexity is worsened
Solution Approach 1:
The light-path controlling layer is designed to serve multiple functions: it blocks light paths for privacy protection, maintains structural integrity of the display, and can be integrated with existing display layers. By making this component multi-functional, the patent reduces the need for separate dedicated privacy mechanisms, thereby limiting the increase in device complexity while achieving privacy protection.
Solution Approach 2:
The light-blocking structures are merged with existing display components such as the light-emitting elements and protective layers. For example, barrier ribs are integrated into the pixel structure, and polarizing films are combined with existing electrode layers. This merging approach allows privacy functionality to be incorporated without adding entirely separate complex subsystems, thus minimizing the impact on device complexity.
3Adaptability or versatility
If multiple light-emitting elements are used to provide different viewing angles, then adaptability is improved, but device complexity is worsened
Solution Approach 1:
The display is segmented into multiple pixel units, each containing first and second light-emitting elements with different emission characteristics. The first light-emitting elements emit light for normal viewing, while the second light-emitting elements are paired with light-blocking structures to provide privacy-mode viewing angles. This segmentation allows independent control of different viewing angles at the pixel level without requiring complex system-wide mechanisms.
Solution Approach 2:
Different regions within the display (specifically different pixel units) are assigned different local configurations: some pixels have only first light-emitting elements for normal viewing, while others have both first and second light-emitting elements with associated light-blocking structures for privacy mode. This local differentiation allows viewing angle control to be implemented selectively where needed, reducing overall device complexity by avoiding uniform complexity across the entire display.
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 enables the display device to switch between normal and privacy modes, maintaining image quality while restricting viewing angles to protect sensitive information, enhancing privacy and compliance with regulatory requirements.
Implementation Method 1
a light path control layer disposed to overlap the second-type light-emitting element, where the light path control layer controls a path of light provided from the second-type light-emitting element
Data Source
AI summary
A display device includes a pixel driving circuit, a first-type light-emitting element electrically connected to the pixel driving circuit, a second-type light-emitting element electrically connected to the pixel driving circuit, and a light path control layer disposed to overlap the second-type light-emitting element, where the light path control layer controls a path of light provided from the second-type light-emitting element.