In-Plane Switching LCD Viewing Angle Control via Sub-Pixel Integration
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Solution Overview
Problem
In-plane switching mode liquid crystal display devices face challenges in maintaining user privacy and security in public places due to wide viewing angles, which can lead to light leakage and reduced front brightness when additional panels are used for viewing angle control, resulting in increased thickness, weight, and potential misalignment.
Innovation Solution
The integration of red, green, and blue sub-pixels with viewing angle controlling sub-pixels on a single substrate, allowing for adjustable viewing angles by controlling voltage levels, enabling operation in both wide and narrow viewing angle modes without additional external panels, thus maintaining privacy and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional panels are used for viewing angle control, then user privacy and security are improved, but device thickness and weight increase
Solution Approach 1:
The patent merges the viewing angle control function with the existing liquid crystal display panel by integrating additional electrodes and control circuits within the same panel structure. This allows the panel to perform both display and viewing angle control functions simultaneously, eliminating the need for separate additional panels and thereby avoiding increased device weight.
Solution Approach 2:
The liquid crystal display panel is designed to perform multiple functions: it serves as both the primary display element and the viewing angle control mechanism. By incorporating additional electrodes and utilizing the liquid crystal material's properties, the same panel structure achieves both image display and viewing angle adjustment, making the system more universal and eliminating the need for separate components.
2Reliability
If additional panels are used for viewing angle control, then user privacy and security are improved, but device thickness increases
Solution Approach 1:
The patent merges the viewing angle control function with the existing liquid crystal display panel by integrating additional electrodes and control circuits within the same panel structure. This allows the panel to perform both display and viewing angle control functions simultaneously, eliminating the need for separate additional panels and thereby avoiding increased device thickness.
Solution Approach 2:
The viewing angle control electrodes and control circuits are nested within the existing panel structure, utilizing the same space and layers as the display function. This nested integration allows the panel to achieve dual functionality without adding external layers or components, thereby maintaining compact device thickness.
3Adaptability or versatility
If additional panels are used for viewing angle control, then viewing angle control is achieved, but alignment precision deteriorates
Solution Approach 1:
The patent merges the viewing angle control function with the existing liquid crystal display panel by integrating additional electrodes and control circuits within the same panel structure. This allows the panel to perform both display and viewing angle control functions simultaneously, eliminating the need for separate additional panels and thereby avoiding increased device thickness.
Solution Approach 2:
The viewing angle control electrodes and control circuits are nested within the existing panel structure, utilizing the same space and layers as the display function. This nested integration allows the panel to achieve dual functionality without adding external layers or components, thereby maintaining compact device thickness.
4Illumination intensity
If in-plane switching mode is used, then wide viewing angle is achieved, but light leakage increases
Solution Approach 1:
The patent implements dynamic viewing angle control by applying different voltages to the liquid crystal molecules, allowing them to reorient themselves. This dynamic adjustment enables the display to switch between wide viewing angle mode and narrow viewing angle mode, providing flexibility to optimize both viewing angle and privacy protection as needed.
Solution Approach 2:
The patent changes the electrical parameters (voltage levels) applied to the liquid crystal material to control the viewing angle. By adjusting the voltage, the liquid crystal molecules change their orientation, which dynamically alters the viewing angle and light leakage characteristics, allowing optimization of both display quality and privacy protection.
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
This solution allows for flexible viewing angle control, enhancing user privacy and security in public places by selectively switching between wide and narrow viewing angles without increasing device thickness or weight, while maintaining high definition and brightness.
Implementation Method 1
A liquid crystal display device is operated by changing optical anisotropy through electric fields applied to liquid crystal having both mobility of liquid and optical characteristics of crystal
Implementation Method 2
changing optical anisotropy through electric fields applied to liquid crystal
Implementation Method 3
A liquid crystal display device is operated by changing optical anisotropy through electric fields applied to liquid crystal having both mobility of liquid and optical characteristics of crystal
Data Source
AI summary
An in-plane switching mode liquid crystal display device includes a first substrate and a second substrate, gate lines and data lines intersecting each other on the first substrate and defining red, green, blue sub-pixels, and viewing angle controlling sub-pixels, thin film transistors at the intersections of the gate lines and the data lines, first pixel electrodes and first common electrodes spaced apart from each other and alternately disposed at the red, green, and blue sub-pixels, second pixel electrodes at the viewing angle controlling sub-pixels, second common electrodes on the second substrate and at positions corresponding to the second pixel electrodes, and a liquid crystal layer between the first substrate and the second substrate.