LCD Electrode Surface Structure for Uniform Liquid Crystal Alignment
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Solution Overview
Problem
In liquid crystal displays with fine slit structures, uneven electric fields can lead to non-uniform orientation of liquid crystal molecules, causing image quality deterioration and reduced light transmissivity due to forward-tapered uneven portions and potential level disconnections in the transparent conductive material layer.
Innovation Solution
A liquid crystal display design featuring a first electrode with projecting and recessed portions formed on a foundation layer, where transparent conductive material layers are connected on the projecting and recessed surfaces, ensuring uniform electric field application and stable liquid crystal orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fine slit structures are used to control liquid crystal molecule orientation, then viewing angle is improved, but light transmissivity deteriorates due to uneven electric fields and non-uniform orientation in slit regions
Solution Approach 1:
The patent removes the slit structures from the electrode design, extracting the problematic region that caused non-uniform electric fields. Instead of using fine slits to control liquid crystal orientation, the invention uses a solid electrode surface with controlled surface roughness, eliminating the root cause of the light transmissivity deterioration while maintaining the viewing angle advantage.
Solution Approach 2:
The patent applies local quality by controlling the surface roughness of the electrode in specific regions. The electrode surface is designed with controlled protrusions and recesses that create localized electric field variations, enabling uniform liquid crystal orientation without needing slit structures. This localized surface modification achieves the desired orientation control while maintaining high light transmissivity.
2Manufacturing precision
If forward-tapered uneven portions are formed on the electrode, then liquid crystal orientation is controlled, but image quality deteriorates due to non-uniform electric fields and level disconnections
Solution Approach 1:
Instead of using forward-tapered uneven portions that cause level disconnections and non-uniform fields, the patent inverts the approach by using backward-tapered or vertically-walled protrusions. These inverted structures maintain electric field uniformity while still providing the necessary surface roughness for liquid crystal orientation control, thereby improving image quality while preserving orientation control capability.
Solution Approach 2:
The patent changes the geometric parameters of the electrode surface irregularities from forward-tapered to backward-tapered or vertical configurations. By modifying the shape parameters of the protrusions (changing from forward-tapered to other configurations), the electric field distribution is improved while maintaining the surface roughness necessary for liquid crystal orientation, thus resolving the image quality deterioration.
3Manufacturing precision
If vertical side surfaces are formed on uneven portions to align liquid crystal molecules, then orientation control is improved, but level disconnection occurs in the transparent conductive material layer
Solution Approach 1:
The patent employs asymmetric side surface configurations on the electrode protrusions, using backward-tapered or vertical walls instead of symmetric forward-tapered structures. This asymmetric design allows the surface roughness to effectively control liquid crystal orientation while avoiding the level disconnection problem that occurs with vertical sides in forward-tapered structures. The asymmetric geometry ensures smooth electric field distribution.
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 design ensures uniform electric field distribution, preventing image quality deterioration and enhancing light transmissivity by aligning liquid crystal molecules effectively, thus improving display quality.
Implementation Method 1
In the VA mode, the liquid crystal molecule has a property in which the negative dielectric constant anisotropy, namely, the dielectric constant in the long axis direction of the liquid crystal molecule is smaller compared to that in the short axis direction
Implementation Method 2
when voltage is applied, the liquid crystal molecules oriented in a direction vertical to the substrates make a response to the voltage so as to fall down in a direction parallel to the substrates due to the negative dielectric constant anisotropy
Data Source
AI summary
A liquid crystal display is formed by arraying a plurality of pixels 10, and the pixel 10 includes a first substrate 20, a second substrate 50, a first electrode 120 formed on the first substrate 20, a second electrode 52 formed on the second substrate 50, and a liquid crystal layer 60. A pretilt angle is provided to a liquid crystal molecule 61, and the first electrode 120 is formed of a transparent conductive material layer and a foundation layer 150 including a plurality of projecting portions 130 and recessed portions 140. A first transparent conductive material layer 135 connected to a first power feeding unit is formed on a projecting portion top surface 151 of the foundation layer 150, and a second transparent conductive material layer 145 connected to a second power feeding unit is formed on a recessed portion bottom surface 152 of the foundation layer 150.