IPS Array Substrate Transparent Electrodes Viewing Angles
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Solution Overview
Problem
In-plane switching (IPS) mode liquid crystal display devices suffer from narrow viewing angles in the up-down and diagonal directions, misalignment issues during manufacturing leading to non-uniform image quality, and low brightness due to opaque common electrodes and misaligned pixel electrodes.
Innovation Solution
The design includes a substrate with a gate line and data line forming pixel regions with specific vertical and horizontal electrode configurations, where the common and pixel electrodes are formed in the same layer using transparent conductive materials, ensuring uniform distances and preventing overlap to enhance viewing angles and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the common electrode is formed as an opaque structure, then the electrode pattern can be clearly defined, but the brightness of the display decreases
Solution Approach 1:
The common electrode is changed from an opaque material to a transparent conductive material (such as ITO - indium tin oxide). This material change allows light to pass through the electrode, significantly improving the brightness of the display while maintaining the electrode's functional properties for generating electric fields to control liquid crystal molecules.
2Manufacturing precision
If the common electrode and pixel electrode are formed in different layers, then the manufacturing process is more flexible, but misalignment occurs leading to non-uniform image quality
Solution Approach 1:
The common electrode and pixel electrode are merged into the same layer structure. Both electrodes are formed simultaneously in the same transparent conductive material layer, ensuring perfect alignment and uniform spacing between them. This eliminates misalignment issues and ensures uniform image quality across the display, while the manufacturing process remains feasible through standard thin-film deposition and patterning techniques.
3Area of stationary object
If the pixel electrode and common electrode overlap, then the aperture ratio increases, but parasitic capacitance causes flicker and vertical line defects
Solution Approach 1:
The pixel electrode and common electrode are segmented into distinct regions within the same layer. The pixel electrode is positioned in the pixel region while the common electrode is positioned in the non-pixel region, separated by insulating structures. This segmentation prevents overlapping that would create parasitic capacitance, eliminating flicker and vertical line defects, while still maintaining a high aperture ratio through optimized electrode geometry and spacing.
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 increases viewing angles, improves brightness by using transparent conductive materials, and prevents flicker and vertical line defects by maintaining equal parasitic capacitances, resulting in high-quality, uniform images.
Implementation Method 1
formed of transparent conductive materials, ensuring uniform distances and preventing overlap to enhance viewing angles and image quality
Implementation Method 2
liquid crystal molecules of the liquid crystal layer LC are driven by a horizontal electric field 35 induced between the common electrode 18 and the pixel electrodes 30
Implementation Method 3
An electric field is induced between the electrodes by applying a voltage to each electrode. An alignment direction of liquid crystal molecules changes in accordance with a variation in the intensity or the direction of the electric field.
Data Source
AI summary
A substrate for a liquid crystal display device includes a gate line along a first direction on a substrate, a data line along a second direction and crossing the gate line to define a pixel region, a thin film transistor on the substrate and electrically connected to the gate and data lines, a pixel electrode in the pixel region and connected to the thin film transistor, and a common electrode in the pixel region, a first capacitance between the data line and the common and pixel electrodes at a first side of the data line being substantially equal to a second capacitance between the data line and the common and pixel electrodes at a second side of the data line.