Lateral Electric Field LCD Shielding Dark Lines
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Solution Overview
Problem
In liquid crystal display devices using lateral electric field modes, there is a challenge in maintaining optimal alignment of liquid crystal molecules to prevent unwanted electric fields that can lead to decreased transmittance and display quality, particularly due to the presence of storage capacitance lines and sub-pixel electrodes.
Innovation Solution
The introduction of a drain electrode or auxiliary electrode, which is interposed between the storage capacitance line and the pixel electrode, acts as a shield to suppress the formation of undesired electric fields, ensuring proper alignment of liquid crystal molecules and enhancing transmittance by overlapping the storage capacitance line, thereby preventing disturbances in the transmissive region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If storage capacitance lines and sub-pixel electrodes are present in lateral electric field mode LCD, then device functionality is achieved, but unwanted electric fields form causing decreased transmittance and display quality
Solution Approach 1:
A drain electrode or auxiliary electrode is introduced as an intermediary component between the storage capacitance line and the pixel electrode. This intermediate electrode acts as a shield to suppress unwanted electric fields while maintaining the necessary electrical connections and device functionality.
Solution Approach 2:
The harmful electric field effect is extracted and isolated by positioning the drain/auxiliary electrode specifically between the storage capacitance line and pixel electrode, removing the harmful interaction while preserving the functional electrical connections.
2Illumination intensity
If drain electrode or auxiliary electrode is introduced to shield unwanted electric fields, then transmittance is improved, but device structure becomes more complex
Solution Approach 1:
The drain electrode or auxiliary electrode serves multiple functions simultaneously: it acts as a shield against unwanted electric fields, maintains electrical connections, and supports the overall pixel structure. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The shielding function is merged into the existing electrode structure by introducing the drain/auxiliary electrode as part of the pixel electrode assembly, combining the shielding capability with the electrical connection function in a single integrated component.
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 effectively suppresses the formation of dark lines near storage capacitance lines, improving transmittance per pixel and maintaining high display quality by shielding unwanted electric fields, resulting in a transmittance of 1.1 compared to 1.0 in comparative examples without this feature.
Implementation Method 1
The introduction of a drain electrode or auxiliary electrode, which is interposed between the storage capacitance line and the pixel electrode, acts as a shield to suppress the formation of undesired electric fields
Implementation Method 2
liquid crystal molecules are switched by a lateral electric field which is substantially parallel to a major surface of the array substrate
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes, a first substrate including a switching element which is electrically connected to a gate line and a source line and includes a drain electrode opposed to a storage capacitance line, a pixel electrode which includes a main pixel electrode extending in a second direction and a sub-pixel electrode which extends in a first direction at a position inside a position above an edge of the drain electrode and is put in contact with the drain electrode, a second substrate including a common electrode, and a liquid crystal layer.