Liquid Crystal Display Common Electrode Segmentation
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Solution Overview
Problem
Conventional liquid crystal display devices with a transverse electric field mode, such as IPS mode, experience image quality degradation due to parasitic capacitance between the common electrode and signal lines, leading to insufficient brightness caused by potential changes in the signal lines affecting the common electrode.
Innovation Solution
The liquid crystal display device incorporates a one-side opening part and interlayer insulation film to reduce contact resistance between the common electrode and the electrode part, allowing the common electrode to be less susceptible to signal line potential changes, thereby maintaining a stable potential difference between pixel and counter electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the common electrode is disposed on the array substrate to generate transverse electric field, then the liquid crystal display device can achieve IPS mode operation, but the common electrode forms parasitic capacitance with signal lines causing potential changes that degrade image quality
Solution Approach 1:
The patent divides the common electrode into two separate parts: one on the array substrate and another on the counter substrate. This segmentation reduces the parasitic capacitance between the common electrode and signal lines by distributing the electrode areas, thereby maintaining IPS mode functionality while improving image quality and reducing noise.
2Force
If the common electrode is located on the array substrate, then transverse electric field can be generated, but the potential difference between pixel electrode and counter electrode decreases due to potential change of common electrode
Solution Approach 1:
By segmenting the common electrode into two parts located on different substrates, the patent reduces the parasitic capacitance effect that causes potential changes. This maintains the potential difference between pixel and counter electrodes, ensuring sufficient brightness while preserving the transverse electric field generation capability.
3Device complexity
If the common electrode is disposed on the array substrate, then the device structure can be simplified, but the common electrode becomes susceptible to potential change of signal line
Solution Approach 1:
The patent segments the common electrode into two parts on different substrates, which reduces parasitic capacitance and makes the common electrode less susceptible to signal line potential changes. This segmentation approach maintains structural simplicity while reducing harmful electromagnetic interference.
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 image quality by maintaining desired brightness and reducing noise, while maintaining manufacturing process simplicity and cost-effectiveness by minimizing changes to existing manufacturing processes.
Implementation Method 1
pixel electrodes and a common electrode which form an electric field to drive the liquid crystal layer
Implementation Method 2
it tends to form parasitic capacitance with respect to a signal line, thus also receiving potential change interlocking with the potential change of the signal line
Data Source
AI summary
According to one embodiment, provide is a liquid crystal display device that suppresses potential change of a common electrode caused by potential change of a signal line. An electrode part is provided on an array substrate so as to surround a display region. A signal line is provided on the array substrate so as to be located in the display region. A passivation film is provided on the array substrate so as to cover at least the signal line and the electrode part. A one-side opening part is provided continuously along an edge part of the display region on the passivation film so that the electrode part is disposed. The common electrode is provided on the array substrate so that a part of the common electrode is located at the one-side opening part and another part of the common electrode is located facing the signal line on the passivation film.