Switchable Sub-Pixel Display Layout for Privacy Viewing Control
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Solution Overview
Problem
Existing display devices face issues with information leakage to third parties and the inconvenience of using security films for controlling viewing angles, which also contribute to greenhouse gas emissions during manufacturing.
Innovation Solution
A display device with sub-pixels that can switch between wide and narrow viewing angles using first and second emitting elements controlled by transistors and mode selection signals, allowing selective viewing angle control without security films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If security films are attached to control viewing angles, then image information can be protected from third parties, but the user has inconvenience of having to carry and manage the security films separately
Solution Approach 1:
The patent extracts the viewing angle control function from external security films and integrates it directly into the display device's pixel structure. Each pixel includes multiple sub-pixels with different viewing angles that can be selectively activated through control transistors, eliminating the need for separate security film management while maintaining image information protection.
Solution Approach 2:
The patent replaces the mechanical security film system with an electronic control system. Instead of physically attaching and detaching security films, the display device uses control transistors and mode control lines to electronically switch between different viewing angle modes (e.g., wide viewing angle mode and narrow viewing angle mode), providing the same functionality through electrical control rather than mechanical manipulation.
2Reliability
If security films are used to prevent viewing by third parties, then image information can be protected, but it is difficult to partially obscure or provide image information to the third party
Solution Approach 1:
The patent segments each pixel into multiple sub-pixels (e.g., first sub-pixel and second sub-pixel) with different viewing angle characteristics. The first sub-pixel can be configured for wide viewing angle while the second sub-pixel is configured for narrow viewing angle. This segmentation allows independent control of different regions within the same pixel, enabling partial obscuration or selective information sharing with third parties without compromising the entire display.
Solution Approach 2:
The patent applies local quality by providing different viewing angle properties to different sub-pixels within the same pixel structure. The first sub-pixel and second sub-pixel have different optical characteristics (different viewing angles) that can be independently activated. This allows the display to have different functional properties in different locations, enabling selective disclosure of information to specific viewers based on their position.
3Manufacturing precision
If multiple mode control lines are used to control viewing angles in different display areas, then precise viewing angle control is achieved, but the device complexity increases
Solution Approach 1:
The patent implements multi-functionality by enabling a single mode control line to control viewing angle modes across multiple display areas through sequential or parallel activation. The same mode control line can be used to switch between wide viewing angle mode and narrow viewing angle mode in different display regions, eliminating the need for separate dedicated control lines for each area while maintaining precise viewing angle control.
Data Source
AI summary
A display device can include a first mode sub-pixel having a first viewing angle and including a first emitting element, a second mode sub-pixel having a second viewing angle and including a second emitting element, a driving transistor connected to the first emitting element or the second emitting element, a first control transistor configured to connect the first emitting element to the driving transistor by being controlled by a mode selecting signal, a second control transistor configured to connect the second emitting element to the driving transistor by being controlled by the mode selecting signal, and a mode control line configured to apply the mode selection signal to the first switching transistor and the second switching transistor. The first control transistor and the second control transistor are applied with the mode selection signal from the same mode control line.