Liquid Crystal Display Shielding Leaked Electric Fields
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Solution Overview
Problem
Existing liquid crystal display devices using lateral electric field modes face challenges in minimizing the influence of leaked electric fields from source lines, which can lead to display degradation and increased power consumption due to unwanted capacitance and crosstalk.
Innovation Solution
The liquid crystal display device incorporates a specific electrode structure with a first common electrode arranged between source lines and a second common electrode set to the same potential, forming an equipotential surface that shields leaked electric fields and reduces capacitance, along with a sub-pixel electrode configuration to control the alignment of liquid crystal molecules and enhance transmissivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a double layer pixel electrode is arranged between adjacent source lines to influence leaked electric field, then the shielding effect against leaked electric field is improved, but the device complexity increases
Solution Approach 1:
The common electrode is divided into two separate layers (first common electrode and second common electrode) positioned at different heights. This segmentation allows each layer to independently contribute to shielding against leaked electric fields from source lines, achieving better protection without requiring a completely redesigned complex electrode structure
Solution Approach 2:
The first common electrode acts as an intermediary shielding layer between the source lines and the pixel electrode. By introducing this intermediate common electrode layer, the harmful leaked electric field is blocked before reaching the pixel electrode, reducing direct influence while maintaining a relatively simple overall structure
2Reliability
If conventional electrode structures are used, then the device complexity is low, but display degradation occurs due to leaked electric field from source lines
Solution Approach 1:
Both the first common electrode and the second common electrode are maintained at the same potential (common potential). This equipotential configuration creates a shielding effect that blocks leaked electric fields from source lines while maintaining structural simplicity. The equipotential surfaces prevent harmful electric field penetration without requiring complex potential control circuits
Solution Approach 2:
The shielding solution is implemented by adding a vertical dimension to the electrode structure. The second common electrode is positioned above the first common electrode in the vertical direction, creating a three-dimensional shielding configuration. This dimensional approach improves reliability against leaked electric fields without significantly increasing planar complexity
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 improves display quality by reducing the impact of leaked electric fields, minimizing display degradation, and increasing transmissivity while maintaining the initial alignment of liquid crystal molecules, thus enhancing the overall performance and efficiency of the liquid crystal display.
Implementation Method 1
a second common electrode including a second main common electrode extending in the second direction on the third interlayer insulating film and facing the source line, the second common electrode set to the same potential as the first common electrode
Implementation Method 2
a structure using lateral electric field, such as IPS (In-Plane Switching) mode and FFS (Fringe Field Switching) mode is put to practical use. Liquid crystal molecules are switched by the lateral electric field substantially in parallel with the principal surface of the array substrate
Data Source
AI summary
A first substrate includes a gate line extending in a first direction, a first interlayer insulating film covering the gate line, a first common electrode formed on the first interlayer insulating film extending in a second direction crossing the first direction, a second interlayer insulating film covering the first common electrode, a source line extending in the second direction, and a third interlayer insulating film covering the source line. A pixel electrode includes a main pixel electrode extending in the second direction on the third interlayer insulating film. A second common electrode includes a second main common electrode extending in the second direction on the third interlayer insulating film and facing the source line. The second common electrode is set to the same potential as the first common electrode. A first alignment film covers the pixel electrode and the second common electrode.