P-Type Liquid Crystal Panel with Lateral Electric Field
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Solution Overview
Problem
Liquid crystal display devices face challenges in achieving simultaneously high-speed response, wide viewing angle, and high contrast, with existing modes either having slow response speeds, complex production processes, or requiring high driving voltages and complex configurations.
Innovation Solution
A liquid crystal panel with a p-type liquid crystal material sandwiched between substrates, utilizing a lateral electric field with electrode widths of 5 μm or less and spacings of 15 μm or less, and a dielectric constant anisotropy (Δε) and refractive index anisotropy (Δn) product in the range of 1.3 to 3.1, allowing for controlled bend alignment and high light transmittance with practical driving voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If MVA mode is used to achieve wide viewing angle and high contrast, then viewing angle and contrast are improved, but production process becomes complex and response speed remains slow
Solution Approach 1:
The patent extracts and eliminates the complex rib structure and multi-domain alignment control mechanisms from the MVA mode, achieving high contrast through vertical alignment of p-type liquid crystal molecules without requiring complex production processes. The solution removes unnecessary structural elements while maintaining the core function of high contrast display.
Solution Approach 2:
The patent changes the alignment mode parameter from multi-domain horizontal alignment to vertical alignment, and uses p-type liquid crystal material with specific dielectric constant anisotropy (Δε) and refractive index anisotropy (Δn) values. This parameter change simplifies the production process while maintaining high contrast and enabling faster response speeds.
2Speed
If OCB mode is used to achieve high-speed response, then response speed is improved, but viewing angle characteristic deteriorates and initial transition driving circuit is required increasing cost
Solution Approach 1:
The patent changes the liquid crystal material parameter to p-type material with specific Δε and Δn values, and adopts vertical alignment instead of splay alignment. This eliminates the need for initial transition driving circuits while achieving both high-speed response and wide viewing angle characteristics simultaneously.
Solution Approach 2:
The patent inverts the conventional OCB mode approach by using vertical alignment instead of splay alignment, and p-type liquid crystal instead of nematic liquid crystal. This inversion eliminates the need for initial transition driving and achieves wide viewing angle without sacrificing response speed.
3Illumination intensity
If electrode width is reduced to 5 μm or less and electrode spacing to 15 μm or less to improve light transmittance, then light transmittance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the electrode geometry parameters (width and spacing) to specific values (5 μm or less and 15 μm or less) that balance light transmittance improvement with manufacturability. The vertical alignment mode and p-type liquid crystal material compensate for the tighter tolerances, making the process feasible.
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 enables a liquid crystal panel to achieve high-speed response, wide viewing angles, and high contrast, comparable to or exceeding those of MVA and IPS modes, while reducing production complexity and driving voltage requirements, thus providing a practical display device.
Implementation Method 1
a liquid crystal panel and a liquid crystal display device each controlling transmission of light by causing bend distortion of a liquid crystal layer by voltage application
Implementation Method 2
electrodes for applying, to the liquid crystal material, an electric field parallel to a substrate surface
Implementation Method 3
the p-type liquid crystal material being vertically aligned with respect to the substrate surface at the time when no electric field is applied
Implementation Method 4
controlling transmission of light by causing bend distortion of a liquid crystal layer
Data Source
AI summary
A liquid crystal panel includes: a p-type liquid crystal material sandwiched by a pair of substrates and comb-teeth shape electrodes for applying, to the p-type liquid crystal material, an electric field parallel to a substrate surface. The p-type liquid crystal material is aligned vertically with respect to the substrate surface at the time when no electric field is applied. The comb-teeth shape electrodes have an electrode width of 5 μm or less, and an electrode spacing of 15 μm or less. A product of a dielectric constant anisotropy Δε and a refractive index anisotropy Δn of the p-type liquid crystal material is 1.3 or more and 3.1 or less.