Viewing Angle Control Panel for Liquid Crystal Display Privacy
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Solution Overview
Problem
Existing display devices, particularly liquid crystal display devices, fail to effectively switch between wide and narrow viewing angles, resulting in insufficient privacy protection as content can still be seen from wide angles in narrow viewing mode.
Innovation Solution
A liquid crystal display device with a viewing angle control panel comprising a first polarizing plate, a liquid crystal layer, and a second polarizing plate, along with phase difference plates, which adjusts retardation values to restrict viewing angles, ensuring content is only visible from specific directions in narrow mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a phase difference control device is provided to switch between wide and narrow viewing angles, then the viewing angle can be adjusted, but the privacy protection effect is insufficient as content can still be seen from wide angles in narrow viewing mode
Solution Approach 1:
The patent changes the optical parameters of the liquid crystal layer by applying different voltages to achieve different viewing angle states. In wide viewing angle mode, the liquid crystal molecules are oriented to allow light passage from multiple angles. In narrow viewing angle mode, the voltage is adjusted to reorient the molecules, restricting light emission to a narrow angular range, thereby preventing side viewing and enhancing privacy protection.
Solution Approach 2:
The patent implements dynamic control of the liquid crystal orientation through voltage application. The system can switch between different viewing angle states (wide and narrow) by dynamically adjusting the electric field applied to the liquid crystal layer, allowing real-time adaptation of the viewing characteristics based on privacy requirements.
2Object-affected harmful factors
If the viewing angle is narrowed to protect privacy, then privacy protection is improved, but the usability for multiple users simultaneously is reduced
Solution Approach 1:
The patent enables dynamic switching between wide and narrow viewing angle modes, allowing the system to adapt to different usage scenarios. When multiple users need to view simultaneously, the wide viewing angle mode is activated. When privacy is prioritized, the narrow viewing angle mode is engaged, providing flexible adaptation to varying operational requirements.
Solution Approach 2:
By changing the voltage parameter applied to the liquid crystal layer, the system transitions between different viewing angle characteristics. This parameter control allows the same display device to serve both multi-user collaboration needs and private viewing needs without requiring separate devices.
3Device complexity
If conventional liquid crystal modes are used for viewing angle control, then the device structure is simple, but the blocking effect in narrow viewing angle mode is insufficient
Solution Approach 1:
The patent achieves enhanced blocking effect by optimizing the voltage parameter applied to the liquid crystal layer in narrow viewing angle mode. By carefully controlling the voltage to achieve specific molecular orientations, the system maximizes light blocking in unwanted directions while maintaining a simple single-layer liquid crystal structure, avoiding the need for complex multi-panel configurations.
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 provides enhanced privacy and security by limiting the viewing angle range, preventing content from being seen from directions other than a specific direction, thus improving the blocking effect in narrow viewing angle mode.
Implementation Method 1
the liquid crystal display panel has a retardation value Re1 of nλ/2−λ/4
Implementation Method 2
the viewing angle control panel includes a first polarizing plate, a liquid crystal layer and a second polarizing plate stacked in this order
Implementation Method 3
the viewing angle control panel includes a first polarizing plate, a liquid crystal layer and a second polarizing plate stacked in this order
Data Source
AI summary
A liquid crystal display device (10) of the present invention includes a backlight (3), a display liquid crystal panel (1) and a viewing angle control panel (2) for switching a viewing angle of the display liquid crystal panel (1) between a wide viewing angle mode and a narrow viewing angle mode. The viewing angle control panel (2) includes a control panel upper polarizing plate (22), a liquid crystal cell (21) and a control panel lower polarizing plate (23) stacked in this order, and phase difference plates (24, 25) are provided between the polarizing plates (22, 23) and the liquid crystal cell (21), respectively. The viewing angle control panel (2) is arranged such that Re1 in a white display portion in the wide viewing angle mode is nλ/2 (n is an integer of 1 or more), Re2 in a white display portion in the narrow viewing angle mode is nλ/2 (n is an integer of 1 or more), and Re3 in a black display portion in the narrow viewing angle mode is nλ (n is an integer of 1 or more).