Transparent Display Device Viewing Angle Control
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Solution Overview
Problem
Existing display devices require security films to control viewing angles, which are inconvenient for users and difficult to manage, especially when partial obscuration or selective image sharing with third parties is needed.
Innovation Solution
A display device with a display panel comprising sub-pixels that can switch between two viewing angles using different light emitting elements and control transistors, allowing for time-divided display driving periods to control the visibility of image information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a security film is attached to control viewing angle, then image information privacy is improved, but user convenience and device complexity deteriorate due to separate film management
Solution Approach 1:
The patent merges the security film function with the display panel by integrating multiple light emitting elements (first and second light emitting elements with different viewing angles) directly into the display structure. This eliminates the need for separate security films while maintaining viewing angle control, thereby improving user convenience without sacrificing information privacy.
Solution Approach 2:
The display panel is designed to perform multiple functions: it displays images normally and simultaneously controls viewing angles through selective activation of different light emitting elements. The first and second light emitting elements serve dual purposes of image display and privacy control, eliminating the need for dedicated security films.
2Loss of information
If a security film is attached to control viewing angle, then image information privacy is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent combines the privacy control function with the display panel by integrating multiple light emitting elements and control transistors directly into the display structure. This eliminates separate security film components and reduces overall device complexity while maintaining privacy control capability.
Solution Approach 2:
The display panel structure is designed to perform both image display and viewing angle control functions through its integrated light emitting elements, eliminating the need for additional security film components and reducing device complexity.
3Adaptability or versatility
If multiple light emitting elements are used for viewing angle control, then viewing angle flexibility is improved, but manufacturing complexity increases
Solution Approach 1:
The patent segments the light emitting structure into multiple independent light emitting elements (first and second light emitting elements) with different viewing angles within each sub-pixel. This segmentation enables flexible viewing angle control while using standard manufacturing processes for creating multiple similar structures in an array.
Solution Approach 2:
The patent changes the physical parameters of light emitting elements by using elements with different viewing angle characteristics (first and second light emitting elements having different viewing angles). This allows viewing angle flexibility to be achieved through parameter variation rather than structural complexity.
Data Source
AI summary
In a display device, each sub-pixel may include a first mode sub-pixel with a first viewing angle having a first light emitting element, a second mode sub-pixel with a second viewing angle having a second light emitting element, a driving transistor connected to the first or second light emitting element, mode selection lines providing a first mode selection signal and a second mode selection signal, a first transistor controlling a connection between the first light emitting element and the driving transistor based on the first mode selection signal, and a second transistor controlling a connection between the second light emitting element and the driving transistor based on the second mode selection signal. The first light emitting element is connected to the driving transistor in a first display driving period. The second light emitting element is connected to the driving transistor in a second display driving period.