Liquid Crystal Display Viewing Angle Control via Multi-Electrode Fields
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Solution Overview
Problem
Existing liquid crystal display devices with wide viewing angle technologies, such as IPS and FFS, cannot adjust viewing angles to be narrow for personal or secure information display while maintaining security and contrast.
Innovation Solution
A liquid crystal display device with a first and second electrode on one substrate and a third electrode on a facing substrate, where a horizontal electric field is generated between the first and second electrodes, and a longitudinal electric field is generated between the third electrode and the first and second electrodes, allowing for adjustable viewing angles by controlling the voltage applied to the third electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If IPS or FFS technology is used to improve viewing angle characteristics, then wide viewing angle is achieved, but the viewing angle cannot be adjusted to be narrow for security purposes
Solution Approach 1:
The electrode system is segmented into multiple independent electrodes (first electrode, second electrode, third electrode) that can be controlled separately. This allows different electric field configurations to be created by selectively activating specific electrodes, enabling both wide and narrow viewing angle modes without requiring a completely different structure for each mode.
Solution Approach 2:
The electrode configuration is made dynamic by allowing voltage to be applied to different electrodes based on the desired viewing angle mode. The system can switch between wide viewing angle (activating first and second electrodes) and narrow viewing angle (activating third electrode) configurations, providing adaptability without permanent structural changes.
2Adaptability or versatility
If a third electrode is added to control viewing angle, then viewing angle adjustability is improved, but device complexity increases
Solution Approach 1:
The third electrode is designed to serve multiple functions: it can create narrow viewing angle mode when activated alone, work in combination with first and second electrodes to enhance wide viewing angle mode, and be integrated into the existing IPS/FFS electrode structure without requiring completely separate control circuits for each mode.
3Adaptability or versatility
If voltage is applied to third electrode to generate longitudinal electric field, then narrow viewing angle is achieved, but contrast ratio may deteriorate
Solution Approach 1:
The system controls the voltage parameter applied to the third electrode to optimize the balance between achieving narrow viewing angle and maintaining contrast ratio. By adjusting the voltage magnitude and timing, the longitudinal electric field strength is controlled to create the desired liquid crystal orientation for security mode while minimizing negative effects on contrast performance.
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
Enables switching between wide and narrow viewing angles, maintaining high contrast and security, with the option to form a dielectric film on the third electrode to enhance viewing angle control and contrast ratio.
Implementation Method 1
a horizontal electric field is generated between the first and second electrodes
Implementation Method 2
a longitudinal electric field is generated between the third electrode and the first and second electrodes
Data Source
AI summary
A liquid crystal display device includes a first electrode and a second electrode on a first substrate, wherein a horizontal electric field is generated between the first and second electrodes, and a third electrode on a second substrate, wherein a longitudinal electric field is generated between the third electrode and the first and second electrodes. In the liquid crystal display device, control of a wide viewing angle and a narrow viewing angle is enabled.