Liquid Crystal Display Element With High Dielectric Insulating Layer
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Solution Overview
Problem
The existing liquid crystal display elements, particularly in the MVA mode, face challenges in achieving high contrast ratio and wide viewing angle due to the limitations of slit structures, which result in reduced transmittance and increased susceptibility to director orientation disturbances, especially when the slit width is minimized to reduce luminance in black displays.
Innovation Solution
The implementation of a liquid crystal display element with a slit structure in the counter electrode and lacking portions in the pixel electrode, combined with a high dielectric constant insulating layer exposed to the liquid crystal layer, controls the falling directions of liquid crystal molecules, maintaining optimal transmittance and contrast ratio while enhancing the viewing angle by setting an electric field that aligns the liquid crystal molecules at 45° to the polarizing plate transmission axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a slit structure is used in the counter electrode to divide the liquid crystal layer into multiple domains, then the viewing angle is improved, but the transmittance decreases and the contrast ratio is reduced
Solution Approach 1:
The patent applies local quality by creating different structural features at different locations: slit structures in the counter electrode and lacking portions in the pixel electrode are positioned specifically to control director orientation in different domains, while the high dielectric constant insulating layer is strategically placed at the lacking portions to enhance the electric field effect locally without affecting the entire electrode structure
Solution Approach 2:
The patent employs asymmetry by making the slit width in the counter electrode different from the width of lacking portions in the pixel electrode, and by positioning them at different locations within the pixel electrode area. This asymmetric design allows optimization of domain division and director orientation while minimizing the impact on overall transmittance
2Manufacturing precision
If the slit width is minimized to reduce luminance in black display, then the contrast ratio is improved, but the director orientation becomes more susceptible to disturbances
Solution Approach 1:
The patent merges two structural approaches: the slit structure in the counter electrode and the lacking portions in the pixel electrode. By combining these features, the patent achieves both precise director orientation control for high contrast ratio and sufficient structural support for orientation stability, as the dual-structure provides multiple anchoring points for the liquid crystal directors
Solution Approach 2:
The high dielectric constant insulating layer acts as an intermediary element that enhances the electric field effect at the lacking portions. This intermediary structure strengthens the orientation control mechanism, ensuring that the minimized slit widths maintain stable director orientation by providing enhanced electrostatic control without requiring larger structural features
3Stability of the object's composition
If rib-shaped projections are used for orientation division, then the director orientation is well-controlled, but the luminance in black display increases due to non-zero birefringence
Solution Approach 1:
The patent inverts the conventional approach by using lacking portions (slits) instead of rib-shaped projections. Rather than adding material to control orientation, the patent removes material to create slit structures that allow the liquid crystal directors to align perpendicular to the substrate, achieving both good orientation control and zero birefringence in the black state
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
This configuration secures high transmittance and contrast ratio while achieving an excellent wide viewing angle range by minimizing the decrease in transmittance caused by the falling direction of liquid crystal molecules and maintaining a high dielectric constant insulating layer, which is transparent in the visible light region and has a relative dielectric constant higher than the substrate bodies.
Implementation Method 1
a high dielectric constant insulating layer which is exposed to the liquid crystal layer through the lacking portions, is transparent in a visible light region and has a relative dielectric constant higher than that of at least either the array substrate body or counter substrate body. By the high dielectric constant insulating layer, an electric field of each domain is set
Implementation Method 2
a high dielectric constant insulating layer which is exposed to the liquid crystal layer through the lacking portions, is transparent in a visible light region and has a relative dielectric constant higher than that of at least either the array substrate body or counter substrate body
Implementation Method 3
a liquid crystal layer including a liquid crystal material having negative dielectric anisotropy and interposed between the array substrate and the counter substrate
Data Source
AI summary
Electrode slit portions are formed in a pixel electrode in a direction of crossing a slit for dividing a liquid crystal layer into a plurality of domains. A titanium oxide film is formed so as to be exposed to the liquid crystal layer side via the electrode slit portions, the titanium oxide film having a relative dielectric constant higher than that of an organic film formed at positions corresponding to the electrode slit portions. By the titanium oxide film, an electric field of each domain is set, angles between the director in the vicinity of the electrode slit portion and transmission axes of polarizing plates are made to approximately 45°, and a decrease in transmittance caused by the falling direction of the director can be suppressed. The transmittance and contrast ratio are secured, and simultaneously an excellent wide viewing angle range can be obtained.