Auxiliary Electrode Edge Reverse Suppression in LCD
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Solution Overview
Problem
Liquid crystal display devices using the line-inversion drive scheme suffer from alignment defects known as edge reverse, leading to non-uniform luminance and display quality deterioration, with existing solutions either reducing luminance or increasing the light-shielding area.
Innovation Solution
Incorporating auxiliary electrodes between pixel electrodes, which are spaced apart and supplied with a voltage of the same polarity as the video signal, to prevent edge reverse alignment defects without reducing the optically reflective area or increasing light-shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the line-inversion drive scheme is used, then the display response speed is improved, but alignment defects (edge reverse) occur leading to non-uniform luminance
Solution Approach 1:
A dummy electrode is introduced as an intermediary element between adjacent pixel electrodes. This dummy electrode serves as a mediator that modifies the electric field distribution in the liquid crystal layer, preventing the edge reverse alignment defect caused by the line-inversion drive scheme while maintaining the fast response speed benefit
Solution Approach 2:
The dummy electrode is strategically positioned only at specific locations (between adjacent pixel electrodes in alternating rows) rather than uniformly across the entire display. This localized approach addresses the alignment defect problem in critical areas without affecting the overall display performance or requiring extensive light-shielding
2Manufacturing precision
If light-shielding structures are added to prevent edge reverse, then alignment uniformity is improved, but the optically reflective area is reduced
Solution Approach 1:
The dummy electrode acts as an active intermediary that eliminates the need for passive light-shielding structures. By modifying the electric field through the dummy electrode, alignment uniformity is achieved without blocking light, thereby preserving the optically reflective area
Solution Approach 2:
The patent replaces the mechanical/light-blocking approach (light-shielding structures) with an electric field control approach (dummy electrode). This substitution allows alignment correction without physically blocking light paths, maintaining display brightness and reflective area
3Illumination intensity
If the optically reflective area is increased, then luminance is improved, but alignment defects become more pronounced
Solution Approach 1:
The dummy electrode serves as a protective intermediary that enables larger optically reflective areas without suffering from edge reverse defects. It creates a controlled electric field environment that maintains alignment uniformity even when pixel electrodes are extended to maximize light reflection
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 solution effectively suppresses edge reverse defects, maintaining high display quality and luminance levels without the need for extensive light-shielding, thereby enhancing the overall performance of liquid crystal display devices.
Implementation Method 1
to which a voltage of the same polarity as the polarity of the first video signal is supplied
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes a liquid crystal layer, a first pixel electrode, a second pixel electrode and an auxiliary electrode. The first pixel electrode includes a first corner portion, a second corner portion and a side edge portion. A first video signal is input in the first pixel electrode. A second video signal of polarity different from polarity of the first video signal is input in the second pixel electrode. The auxiliary electrode includes a first region and a second region. A voltage of the same polarity as the polarity of the first video signal is supplied to the auxiliary electrode.