Liquid Crystal Panel Azimuthal Angle Control for Privacy
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Solution Overview
Problem
Existing liquid crystal panels fail to achieve a small light-shielding angle in the narrow viewing angle mode and exhibit significant color shift in the front view, limiting their privacy and display performance.
Innovation Solution
A liquid crystal panel design incorporating a first polarizing plate, substrates with electrodes, and a liquid crystal layer, where the azimuthal angles of the liquid crystal molecules and polarizing plate axes are strategically aligned to achieve a small light-shielding angle and reduced color shift, with specific retardation values and electrode configurations to control light transmission and blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional liquid crystal panel designs are used, then the structure is simple and manufacturing is easy, but the light-shielding angle is large and color shift occurs in front view
Solution Approach 1:
The patent applies parameter changes by precisely controlling the azimuthal angles of liquid crystal molecules at different substrates (φ1 and φ2) and their relationship with the polarizing plate absorption axis (φP1). By setting specific angular relationships (|φ1-φ2| between 5-20 degrees, and |φP1-φ2| between 5-20 or 65-80 degrees), the invention achieves small light-shielding angles and reduced color shift without requiring fundamental structural changes to the liquid crystal panel.
Solution Approach 2:
The patent employs asymmetry by creating intentional angular misalignment between the liquid crystal molecule directors at the first and second substrates. The azimuthal angles φ1 and φ2 are set to be different, breaking the symmetric alignment that would otherwise cause color shift. This asymmetric configuration, combined with specific retardation values, enables the panel to achieve narrow viewing angle in privacy mode while minimizing color shift in front view.
2Adaptability or versatility
If the viewing angle is widened for public mode, then the image can be observed from wider angles, but the privacy protection capability is reduced
Solution Approach 1:
The patent applies dynamics by enabling the liquid crystal panel to switch between different viewing angle modes through voltage control. In public mode, the liquid crystal molecules are aligned to provide wide viewing angle for image observation. In privacy mode, the molecular alignment is changed to restrict viewing angle and block oblique light. This dynamic reconfigurability allows the same panel to serve both public accessibility and privacy protection needs.
Solution Approach 2:
The patent implements universality by designing a single liquid crystal panel structure that performs multiple functions: it provides wide viewing angle for public mode image observation, narrow viewing angle for privacy mode protection, and minimal color shift for display quality. The same panel structure with controlled azimuthal angles and retardation values achieves all these functions without requiring separate panels for different modes.
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 effectively narrows the viewing angle range in privacy mode while minimizing color shift, enhancing privacy protection and display performance by achieving a small light-shielding angle and maintaining production efficiency and reliability.
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
Implementation Method 3
The liquid crystal molecules in the liquid crystal layer tilt in the direction parallel or perpendicular to the polarization axis of linearly polarized light incident on the liquid crystal layer when voltage is applied to the liquid crystal layer
Data Source
AI summary
Provided is a liquid crystal panel sequentially including: a first polarizing plate with a first absorption axis; a first substrate including a first electrode; a liquid crystal layer containing liquid crystal molecules; and a second substrate including a second electrode. The liquid crystal panel satisfies the following Formula (1) as well as the following Formula (2-1) or Formula (2-2):5°≤|φ1−φ2|≤20° (Formula 1)5°≤|φP1−φ2|≤20° (Formula 2-1)65°≤|φP1−φ2|≤80° (Formula 2-2)wherein φ1 represents an azimuthal angle of a director of liquid crystal molecules near the first substrate, φ2 represents an azimuthal angle of a director of liquid crystal molecules near the second substrate, and φP1 represents an azimuthal angle of the first absorption axis of the first polarizing plate, each with no voltage applied.