Parallax Barrier with Dynamic Liquid Crystal Control
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Solution Overview
Problem
The reliability of privacy protection in display devices with parallax barriers is low due to a fixed direction of privacy protection, which does not effectively prevent others from viewing private information from various angles.
Innovation Solution
A parallax barrier system with a sealed cavity containing a liquid crystal layer and transparent electrode blocks arranged in arrays, allowing for dynamic control of liquid crystal deflection to adjust transparency based on the content display direction, enabling flexible privacy protection in two directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed direction parallax barrier is used, then the device complexity is reduced, but the reliability of privacy protection deteriorates
Solution Approach 1:
The parallax barrier is segmented into multiple independent transparent electrode blocks arranged in arrays along first and second directions. Each electrode block can be independently controlled to deflect liquid crystal molecules, creating multiple shielding directions. This segmentation enables the barrier to protect privacy in both horizontal and vertical directions simultaneously, resolving the contradiction between fixed-direction simplicity and multi-directional reliability.
Solution Approach 2:
The parallax barrier transitions from a fixed static structure to a dynamic controllable system. By applying different voltages to different transparent electrode blocks, the liquid crystal deflection angle and shielding direction can be dynamically adjusted. This allows the system to adaptively change privacy protection directions based on viewing angles, improving reliability while maintaining manageable complexity through electronic control.
2Adaptability or versatility
If transparent electrode blocks are arranged in arrays along two directions, then the adaptability of privacy protection is improved, but the device complexity increases
Solution Approach 1:
The transparent electrode blocks serve multiple functions: they act as both the structural framework and the active control elements for liquid crystal deflection. The same electrode blocks that define the grid structure also generate the electric fields necessary for liquid crystal manipulation. This multi-functionality reduces the need for separate control mechanisms, balancing adaptability with device complexity.
Solution Approach 2:
Different regions of the transparent electrode blocks can be controlled independently with different voltages, creating local variations in liquid crystal deflection. This local quality control allows specific areas to provide shielding in different directions, enabling the parallax barrier to adapt to different viewing scenarios while maintaining a relatively simple overall structure.
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 system enhances the flexibility and reliability of privacy protection by dynamically adjusting the parallax barrier's transparency in response to different content display directions, effectively shielding private information from unwanted views.
Implementation Method 1
a voltage difference to deflect liquid crystal in the liquid crystal layer is capable of forming between the second transparent electrode layer and the transparent electrode block
Implementation Method 2
The liquid crystal layer controls whether a linearly-polarized light incident from a light entering side of the sealed cavity passes through the first polarizer or is filtered by the first polarizer
Data Source
Figure 1A~1B
Figure 1C~2
Figure 3
AI summary
A parallax barrier, a display device and a display state control method belong to the field of display technology. The parallax barrier (01) includes: a sealed cavity (10) and a first polarizer (20) disposed on a light exiting side of the sealed cavity (10), wherein the sealed cavity (10) includes: a first substrate (11) and a second substrate (12) and a liquid crystal layer (13) provided between the two substrates (11, 12), a first transparent electrode layer (14) is provided on a surface of the first substrate (11), and the first transparent electrode layer (14) is a plurality of transparent electrode blocks (141) arranged in an array, and a second transparent electrode layer (15) is provided on a surface of the second substrate (12), and a voltage difference to deflect liquid crystal is capable of forming between the second transparent electrode layer (15) and the transparent electrode block (141). By controlling different transparent electrode blocks (141), the parallax barrier (01) can protect privacy in two directions.