Liquid Crystal Display Common Electrode Slit Shielding
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in effectively shielding undesirable electric fields from source lines and gate lines, which can lead to display degradation and mixed colors, especially when pixels are in different states, and there is a need to improve the transmissive domains and reduce power consumption.
Innovation Solution
The liquid crystal display device incorporates a first common electrode with a slit extending in the second direction, a second common electrode set to the same potential as the first common electrode, and a main pixel electrode facing the slit, along with a sub-pixel electrode electrically coupled to the main pixel electrode, to form a lateral electric field that controls liquid crystal molecule alignment and shields unwanted electric fields, thereby improving display quality and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wide black matrix is used to shield undesirable electric fields, then display quality is improved, but the transmissive domain is reduced and power consumption increases
Solution Approach 1:
The black matrix is divided into multiple regions with different widths: a first black matrix region with a first width and a second black matrix region with a second width. This segmentation allows the black matrix to provide adequate shielding in critical areas while minimizing the overall area occupied, thus preserving more transmissive domain without compromising display quality.
Solution Approach 2:
Different regions of the black matrix are assigned different widths based on their specific functional requirements. The first black matrix region has a different width than the second black matrix region, optimizing the shielding effect locally where needed while reducing the black matrix area in other regions, thereby increasing the transmissive domain.
2Object-affected harmful factors
If the black matrix is made wider to shield electric fields from source lines, then shielding effectiveness is improved, but power consumption increases
Solution Approach 1:
The black matrix is segmented into regions with different widths, allowing adequate shielding effectiveness in areas where electric field interference from source lines is most problematic, while minimizing the total black matrix area to reduce power consumption associated with driving the display.
Solution Approach 2:
The black matrix width is optimized locally: the first black matrix region has a width sufficient to shield against source line electric fields, while the second black matrix region has a different width appropriate for its specific location, achieving effective shielding without unnecessarily increasing overall power consumption.
3Ease of manufacture
If conventional common electrode structures are used, then manufacturing is simplified, but undesirable electric fields from source lines leak to the liquid crystal layer causing display degradation
Solution Approach 1:
The common electrode is divided into multiple regions: a first common electrode region and a second common electrode region, with the source line positioned between them. This segmentation creates an electrical configuration that prevents electric field leakage from the source line to the liquid crystal layer, while still maintaining a relatively simple manufacturing process.
Solution Approach 2:
The source line acts as an intermediary element positioned between the first and second common electrode regions. This configuration uses the source line's position and potential to shield the liquid crystal layer from undesirable electric fields, preventing field leakage while maintaining manufacturing simplicity.
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 enhances display clarity by controlling liquid crystal molecule alignment, reducing the impact of undesirable electric fields, and maintaining display quality even when adjacent pixels are in different states, while also minimizing power consumption and the need for a wide black matrix.
Implementation Method 1
a first common electrode including a first sub-common electrode facing the gate line and a first main common electrode facing the source line extending on the first interlayer insulating film, the first common electrode having a slit extending in the second direction, a second common electrode including a second sub-common electrode facing the first sub-common electrode and a second main common electrode facing the first main common electrode extending on the second interlayer insulating film, the second common electrode being set to the same potential as the first common electrode
Implementation Method 2
a technique to align liquid crystal molecules is proposed by forming lateral electric field or oblique electric field between pixel electrodes arranged in an array substrate and common electrodes arranged in a counter substrate
Data Source
AI summary
A first interlayer insulating film is arranged on a gate line and a source line. A first common electrode includes a first sub-common electrode extending in a first direction so as to face the gate line and a first main common electrode extending in a second direction so as to face the source line on the first interlayer insulating film. The first common electrode has a slit extending in the second direction. A second interlayer insulating film covers the first common electrode. A main pixel electrode extends in the second direction on the second interlayer insulating film so as to face the slit. A second common electrode includes a second sub-common electrode extending on the second interlayer insulating film so as to face the first sub-common electrode and a second main common electrode facing the first main common electrode.