Adjustable Viewing Angle LCD with Voltage-Controlled Liquid Crystal Layer
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Solution Overview
Problem
Conventional LCDs fail to effectively protect user privacy and maintain data security due to limitations in their viewing angle technology, as bystanders can still see the screen's content from a squint direction, even in narrow-viewing-angle mode, and the brightness is compromised when switching between viewing modes.
Innovation Solution
An adjustable-viewing-angle LCD design incorporating a viewing-angle-adjusting device with a liquid crystal layer between substrates, allowing for switching between wide and narrow viewing angles by applying specific voltage differences, maintaining constant contrast and brightness for front viewers while preventing side views from seeing the content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional LCD uses narrow-viewing-angle technology to protect privacy, then bystanders in squint direction cannot see the content, but the viewing angle becomes too limited for normal use
Solution Approach 1:
The patent applies a liquid crystal layer that can dynamically change its molecular orientation in response to voltage changes. This allows the viewing angle characteristic to be dynamically adjusted between narrow (for privacy) and wide (for normal use) modes, resolving the contradiction between fixed privacy protection and flexible viewing angle needs
Solution Approach 2:
The patent changes the physical state parameter of the liquid crystal molecules from a fixed orientation to a voltage-controlled variable orientation. By applying different voltage levels, the molecular alignment changes, which in turn changes the viewing angle characteristic, enabling both privacy protection and wide viewing angle capability
2Object-affected harmful factors
If the LCD switches between wide and narrow viewing angle modes, then privacy can be protected, but the brightness and contrast change affecting display quality
Solution Approach 1:
The patent incorporates a feedback mechanism where the liquid crystal layer's molecular orientation is continuously monitored and adjusted based on voltage input. This feedback control ensures that the brightness and contrast remain stable while the viewing angle characteristic changes, preventing display quality degradation during mode switching
Solution Approach 2:
The patent pre-adjusts the liquid crystal layer's molecular orientation before mode switching occurs. By applying the appropriate voltage in advance, the system prepares the display in the target state, ensuring smooth transitions without sudden brightness or contrast changes that would affect display quality
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 solution allows users to adjust the LCD's viewing angle seamlessly between wide and narrow modes without altering contrast or brightness for front viewers, enhancing privacy and data security while maintaining display quality.
Implementation Method 1
The liquid crystal molecules and the macromolecules are sealed between the upper substrate and the lower substrate
Implementation Method 2
the light transmission line of the upper polarizer and that of the lower polarizer are perpendicular to each other
Implementation Method 3
n0, the refractive index of the short axis of the liquid crystal molecules in the PDLC device 11, is equal to the refractive index of the macromolecules enabling the PDLC device 11 to be at a transparent state
Implementation Method 4
the PDLC device 11 is at a scattering state. Meanwhile, the parallel backlight 12a will become the non-parallel backlight 12b after passing through the PDLC device 1
Data Source
AI summary
An LCD includes a backlight module, two polarizers, an LCD panel and a viewing-angle-adjustable device. The polarizers are disposed over the backlight module. The LCD panel and the first viewing-angle-adjusting device are disposed between the polarizers. The viewing-angle-adjusting device comprises a first substrate, a first electrode, a liquid crystal layer, a second electrode and a second substrate. The first electrode is disposed on the first substrate. The liquid crystal layer is disposed on the first electrode. The second electrode and the second substrate are disposed on the liquid crystal layer. The first liquid crystal layer is sealed between the first substrate and the second substrate. The second electrode is disposed on the bottom surface of the second substrate.