Kerr Effect Display Element With Protruding Electrodes
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Solution Overview
Problem
Conventional liquid crystal display elements face limitations in response speed, viewing angle, and driving voltage, with TN mode exhibiting slow response and narrow viewing angles, while FLC and AFLC modes offer high-speed response and wide viewing angles but are poor in shock resistance and temperature stability, and polymer dispersion type modes struggle with response time and viewing angle control.
Innovation Solution
A display element with a pair of transparent substrates and a medium whose optical anisotropy is changed by an electric field, featuring electrodes that apply a parallel electric field to increase the thickness of the medium layer and separate the maximal electric field region from the substrate interfaces, allowing for high-speed response and wide viewing angles without the limitations of traditional liquid crystal display elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If TN mode liquid crystal display elements are used, then the display element is widely adopted in practical use, but the response speed is slow and viewing angle is narrow
Solution Approach 1:
The patent changes the fundamental operating parameter from liquid crystal molecule rotation (TN mode) to electronic polarization (Kerr effect), where the refractive index is changed by external electric field without molecular reorientation. This parameter change enables high-speed response while maintaining wide viewing angles and resolves the contradiction between practical adoption and response speed.
Solution Approach 2:
The patent replaces the mechanical rotation of liquid crystal molecules with an electronic field effect (Kerr effect). Instead of mechanically rotating molecules to change optical properties, the invention uses electric field-induced electronic polarization to change refractive index, achieving faster response and wider viewing angles while maintaining practical usability.
2Speed
If FLC or AFLC display modes are used, then high-speed response and wide viewing angles are achieved, but shock-resistant property and temperature property are significantly poor
Solution Approach 1:
The patent replaces the mechanical alignment and rotation of liquid crystal molecules (FLC/AFLC mode) with an electronic field effect (Kerr effect). The electronic polarization mechanism does not rely on physical molecular alignment, making the display element resistant to shock and temperature variations while maintaining high-speed response and wide viewing angles.
3Illumination intensity
If polymer dispersion type liquid crystal display mode is used, then polarizer is not required and bright display is achieved, but response property is poor and viewing angle cannot be controlled
Solution Approach 1:
The patent replaces the polymer dispersion mechanism (which relies on scattering and lacks response control) with the Kerr effect mechanism. The electronic field-induced polarization change provides both fast response property and controllable viewing angle while maintaining the advantage of bright display without requiring polarizers.
4Ease of operation
If liquid crystal molecules are orientated in a certain direction to enable display, then the displayed image looks different depending on viewing angle, but the viewing angle is limited
Solution Approach 1:
The patent replaces the directional molecular orientation mechanism with electronic polarization induced by electric field. The Kerr effect changes refractive index through electronic cloud distortion rather than molecular reorientation, eliminating viewing angle limitations while maintaining display functionality and enabling wide viewing angles.
5Ease of operation
If liquid crystal molecules are rotated in alignment by applying electric field, then display operation is achieved, but time is taken to respond
Solution Approach 1:
The patent replaces the slow mechanical rotation of aligned liquid crystal molecules with the rapid electronic polarization effect (Kerr effect). The electric field directly induces changes in electronic cloud distribution, changing refractive index almost instantaneously without requiring molecular rotation, thus achieving fast response time while maintaining display operation capability.
6Device complexity
If conventional electrode structures are used, then the electric field is applied to the medium layer, but the maximal electric field region is close to substrate interfaces reducing practical thickness
Solution Approach 1:
The patent introduces a third dimension (vertical height) to the electrode structure by forming protruding portions that extend into the medium layer. This dimensional change creates a maximal electric field region separated from substrate interfaces, increasing the practical thickness of the medium layer that experiences the electric field while maintaining a relatively simple overall electrode structure.
Solution Approach 2:
The patent performs preliminary action by pre-forming protruding portions on the electrode surfaces before applying the electric field. These protruding portions are positioned in advance to create the maximal electric field region at an optimal distance from substrate interfaces, ensuring that the electric field is effectively applied to the thickest possible portion of the medium layer.
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 a high-speed response, wide viewing angles, and reduced driving voltage, while preventing contrast deterioration and printing afterimages, making it suitable for field sequential color mode displays.
Implementation Method 1
The electro-optic effect is a phenomenon in which a refractive index of a material is changed by an external electric field
Implementation Method 2
Especially Kerr effect (secondary electro-optic effect) has been adopted in high-speed optical shutters early on
Data Source
AI summary
A display element of the present invention includes: a pair of substrates at least one of which is transparent; a medium layer, made of a medium sandwiched between the substrates 1 and 2, whose magnitude of an optical anisotropy is changed by applying an electric field; and at least a pair of electrodes applying to the medium layer an electric field which is substantially parallel to the substrates. The electrodes are provided above the substrate via insulating layers each of which is formed in a convex shape. Therefore, a maximal electric field region generated by the electrodes is separated from interfaces of the substrates.