Viewing Angle Control Liquid Crystal Panel with Multi-Layer Polarizers
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Solution Overview
Problem
Existing viewing angle-controlling liquid crystal panels do not effectively narrow the viewing angle range in the narrow viewing angle mode, leading to insufficient light blocking capabilities.
Innovation Solution
A viewing angle-controlling liquid crystal panel configuration comprising multiple polarizing plates and liquid crystal panels with specific electrode structures and retardation values, along with a display device design that includes a backlight and a display-providing liquid crystal panel, to enhance light-shielding intensity and angle range in the narrow viewing angle mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single liquid crystal panel with basic polarizing plates is used, then the device structure remains simple, but the light-shielding intensity and angle range in narrow viewing angle mode are insufficient
Solution Approach 1:
The patent combines multiple liquid crystal panels (first and second liquid crystal panels) with multiple polarizing plates into a single integrated viewing angle control panel. This merging approach achieves enhanced light-shielding intensity and broader light-shielding angle range in narrow viewing angle mode, while maintaining a unified panel structure that does not significantly increase overall device complexity
Solution Approach 2:
The viewing angle control function is segmented into multiple independent liquid crystal panels, each with specific electrode structures and retardation values. The first liquid crystal panel has a first electrode and second electrode with specific orientations, while the second liquid crystal panel has corresponding electrodes. This segmentation allows each panel to contribute differently to the overall light-shielding performance, achieving superior privacy protection through coordinated operation of multiple functional segments
2Reliability
If conventional liquid crystal panel configuration is used, then manufacturing remains straightforward, but the light-shielding angle range is too wide and privacy protection is insufficient
Solution Approach 1:
The patent employs specific parameter configurations including precise retardation values for each liquid crystal panel, specific electrode orientation angles (e.g., first electrode at 0°, second electrode at 90°), and controlled thickness dimensions. These parameter optimizations enable the panel to achieve narrow viewing angle control with enhanced privacy protection while maintaining manufacturability through well-defined specification ranges
Solution Approach 2:
The patent uses a composite structure combining multiple liquid crystal panels with different optical properties, multiple polarizing plates with specific transmission axes, and various electrode materials. This composite construction allows each layer to contribute its unique properties to the overall system, achieving superior light-shielding performance across different viewing angles while maintaining a manufacturable integrated structure
3Reliability
If multiple polarizing plates and liquid crystal panels are combined with specific configurations, then light-shielding angle range expands and privacy protection enhances, but the panel structure becomes more complex
Solution Approach 1:
The patent extends the viewing angle control from a single-plane approach to a multi-dimensional configuration by stacking multiple liquid crystal panels and polarizing plates in the thickness direction. This dimensional extension creates independent control layers that can selectively block light from different viewing angles, achieving comprehensive privacy protection through three-dimensional optical path management
Solution Approach 2:
The patent introduces intermediary optical elements including multiple polarizing plates positioned between the liquid crystal panels, and optical compensation films with specific retardation values. These intermediary components mediate the optical interaction between the liquid crystal panels, enabling precise control over light transmission and shielding characteristics while maintaining a cohesive integrated panel 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 solution achieves improved light-shielding intensity and expanded light-shielding angle range in the narrow viewing angle mode, providing enhanced privacy protection by effectively blocking light at specific polar angles.
Implementation Method 1
voltage is applied to a liquid crystal composition sealed between paired substrates such that the alignment of liquid crystal molecules in the liquid crystal composition is changed according to the applied voltage, whereby the amount of light passing through the panel is controlled
Implementation Method 2
a polarizing plate that transmits only light components parallel to the polarization axis of the linearly polarized light incident on the liquid crystal layer, among the light components emitted from the liquid crystal layer
Data Source
AI summary
A viewing angle-controlling liquid crystal panel sequentially includes a first polarizing plate; a first liquid crystal panel; a second polarizing plate; a second liquid crystal panel; and a third polarizing plate, wherein an azimuthal angle φP1 of the absorption axis of the first polarizing plate, an azimuthal angle φ1 of a director of liquid crystal molecules near the first substrate and an azimuthal angle φ2 of a director of liquid crystal molecules near the second substrate in the first liquid crystal panel, an azimuthal angle φP2 of the absorption axis of the second polarizing plate, an azimuthal angle φ3 of a director of liquid crystal molecules near the third substrate and an azimuthal angle φ4 of a director of liquid crystal molecules near the fourth substrate in the second liquid crystal panel, and an azimuthal angle φP3 of the absorption axis of the third polarizing plate satisfy specific formulas.