Same-Layer Pixel and Common Electrodes for IPS LCD Viewing Angle
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Solution Overview
Problem
In-plane switching mode liquid crystal display devices have narrow viewing angles in the up-down and diagonal directions due to misalignment of common and pixel electrodes formed in different layers, leading to uneven image quality and low brightness.
Innovation Solution
The solution involves forming a pixel electrode and a common electrode on the same layer, with horizontal parts and portions respectively, to ensure uniform alignment and increased aperture ratio, using transparent conductive materials to improve brightness and viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If common electrode and pixel electrode are formed in different layers, then the device structure is established, but misalignment occurs leading to narrow viewing angles and uneven image quality
Solution Approach 1:
The patent merges the common electrode and pixel electrode into the same layer, eliminating the misalignment issues that occur when they are formed in different layers. This single-layer configuration ensures precise alignment between the electrodes while reducing the overall device complexity of the multi-layer structure.
2Illumination intensity
If traditional multi-layer electrode structure is used, then device fabrication is established, but aperture ratio is reduced and brightness is low
Solution Approach 1:
By combining the common electrode and pixel electrode into a single layer, the patent increases the aperture ratio as there is no need for multiple overlapping layers. This merger also simplifies the device structure while improving brightness through the larger light-transmitting area.
3Adaptability or versatility
If electrodes are formed in different layers, then manufacturing process is established, but viewing angles are narrow in up-down and diagonal directions
Solution Approach 1:
The patent merges both electrodes into the same layer, which inherently provides precise alignment and enables the liquid crystal molecules to be properly aligned for wide viewing angles in both up-down and diagonal directions, overcoming the limitations of the traditional multi-layer approach.
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 approach enhances the viewing angles in the up-down and diagonal directions, improves image quality by preventing misalignment, and increases the brightness of the liquid crystal display device.
Implementation Method 1
An electric field is induced between the electrodes by applying a voltage to each electrode. The alignment direction of liquid crystal molecules changes in accordance with a variation in the intensity or the direction of the electric field.
Implementation Method 2
The liquid crystal material has an intermediate state between a solid crystal and an isotropic liquid. The liquid crystal material is fluid like the isotropic liquid, and molecules of the liquid crystal material are regularly arranged like the solid crystal. An alignment direction of the liquid crystal molecules depends on the intensity or the direction of an electric field applied to the liquid crystal molecules.
Data Source
AI summary
An array substrate for an in-plane switching mode liquid crystal display device includes a substrate, a gate line along a first direction on the substrate, a data line along a second direction and crossing the gate line to define a pixel region, a common line on the substrate, a thin film transistor connected to the gate and data lines, a pixel electrode in the pixel region and connected to the thin film transistor, the pixel electrode including horizontal parts along the first direction, and a common electrode in the pixel region and connected to the common line, the common electrode including horizontal portions along the first direction, wherein the pixel electrode and the common electrode are formed on a same layer.