Sub-Pixel Viewing Angle Switching for Secure Display Panels
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Solution Overview
Problem
Existing display devices face issues with information leakage to third parties and require security films that need separate management, increasing bezel width and contributing to greenhouse gas emissions during manufacturing.
Innovation Solution
A display device with sub-pixels that can switch between wide and narrow viewing angles using dual emitting elements and control signals, eliminating the need for security films and reducing bezel width while minimizing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a security film is attached to the display device to prevent information leakage, then viewing angle control is improved, but the bezel width increases and device complexity increases
Solution Approach 1:
The patent extracts the security function from the separate physical security film and integrates it directly into the display panel structure. The viewing angle control is achieved through the optical properties of the display panel itself (using elements like circular polarizers and beam splitting films) rather than an attached film, thereby eliminating the need for additional bezel space for film management.
Solution Approach 2:
The patent combines the security function with the display function by integrating the viewing angle control mechanism into the display panel's optical stack. The same optical elements that control viewing angle also provide the security function, merging two previously separate functions into one integrated system.
2Reliability
If a security film is attached to the display device to prevent information leakage, then viewing angle control is improved, but device complexity increases due to separate film management
Solution Approach 1:
The patent extracts the security function from the separate physical security film and integrates it directly into the display panel structure. The viewing angle control is achieved through the optical properties of the display panel itself (using elements like circular polarizers and beam splitting films) rather than an attached film, thereby eliminating the need for additional bezel space for film management.
Solution Approach 2:
The display panel itself provides the security function through its integrated optical structure, eliminating the need for external security films that require separate management. The panel's own optical elements (polarizers, beam splitting films) perform both display and security functions, making the system self-sufficient.
3Device complexity
If traditional display structures are used without viewing angle control, then device complexity is reduced, but information security deteriorates
Solution Approach 1:
The patent introduces dynamic viewing angle control into the display structure by using switchable optical elements (such as electrochromic layers or liquid crystal elements) that can change their optical properties based on control signals. This allows the display to dynamically adjust its viewing characteristics to prevent information leakage when needed, adding security functionality without requiring a completely different display architecture.
Solution Approach 2:
The patent changes the optical parameters of the display structure by introducing elements that can alter light transmission properties (such as circular polarizers and beam splitting films) to control viewing angle. These parameter changes enable viewing angle restriction to prevent information leakage while maintaining the basic display structure.
Data Source
AI summary
A display device may include sub-pixels, each sub-pixel including: 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; a first emitting control line supplying a first emitting control signal; a second emitting control line supplying a second emitting control signal; a first switching transistor supplying a reference voltage to a storage capacitor by being controlled by the first emitting control signal; a second switching transistor supplying a reference voltage to a storage capacitor by being controlled by the second emitting control signal; a first control transistor connecting the first emitting element and the driving transistor by being controlled by the first emitting control signal; and a second control transistor connecting the second emitting element and the driving transistor controlled by the second emitting control signal.