IPS Liquid Crystal Display Common Electrode Slit Design
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Solution Overview
Problem
In IPS mode liquid crystal display devices, the transmittance and brightness are insufficient due to incomplete utilization of liquid crystal molecules around the pixel electrode, as the electric field lines do not effectively reach the outer regions of the pixel electrode, leading to reduced light control.
Innovation Solution
A liquid crystal display device design featuring a common electrode with slit-like openings on both sides of the pixel electrode, allowing electric field lines to extend further and control liquid crystal molecules more effectively, increasing transmittance and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common electrode is formed in a planar shape below the pixel electrode, then the device structure is simple and easy to manufacture, but the electric field lines do not reach the outer regions of the pixel electrode effectively, resulting in insufficient transmittance and brightness
Solution Approach 1:
The common electrode is divided into multiple regions: a first common electrode region overlapping the pixel electrode and a second common electrode region extending beyond the pixel electrode in the horizontal direction. This segmentation allows different parts of the common electrode to serve different functions, with the second region specifically designed to extend electric field lines to the outer regions of the pixel electrode, thereby improving brightness without complicating the overall manufacturing process
Solution Approach 2:
The common electrode extends not only in the vertical direction (overlapping the pixel electrode) but also in the horizontal direction beyond the pixel electrode boundaries. This dimensional extension creates additional electric field pathways that reach the outer regions of the pixel electrode, enhancing light control and brightness while maintaining a relatively simple planar structure
2Illumination intensity
If the common electrode is extended beyond the pixel electrode in the horizontal direction, then electric field lines reach outer regions improving transmittance, but the device complexity increases
Solution Approach 1:
The extended common electrode serves multiple functions: it maintains the standard capacitive coupling function in the overlapping region while simultaneously acting as an electric field extension mechanism in the non-overlapping horizontal regions. This multi-functionality improves transmittance without requiring additional separate components or complex structures
Solution Approach 2:
The invention merges the common electrode function with the electric field extension function into a single continuous electrode structure. By forming the common electrode as one integrated element that spans both the overlapping and non-overlapping regions, the design avoids the complexity of multiple separate components while achieving improved transmittance
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 enhances pixel transmittance by up to 7% compared to conventional structures, improving the overall brightness and viewing angle characteristics of the display.
Implementation Method 1
When a voltage is applied to the pixel electrode 110, electric field lines are generated from the pixel electrode 110 towards the common electrode, passing through the liquid crystal layer
Implementation Method 2
The liquid crystal molecules are rotated by the components of the electric field lines in the direction parallel to the plane of the substrate, to control the transmittance of light through the liquid crystal layer
Data Source
AI summary
In order to increase the transmittance around a pixel and to increase the brightness of the screen in an IPS mode liquid crystal display device, a pixel electrode with a slit is formed on a common electrode through an interlayer insulating film. An opening is formed in the common electrode on the outside of the end portion of the pixel electrode as seen in a plane view. Because of the presence of the opening, the electric field lines from the end portion of the pixel electrode reach the layer above the liquid crystal layer and reach further away from the end portion of the pixel electrode, so that it is possible to increase the control ability to the liquid crystal around the pixel. As a result, the pixel transmittance can be increased as a whole and the brightness of the screen can be increased.