Shield Electrode Array Substrate for Display Panel Light Leakage
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Solution Overview
Problem
In display technology, fringe electric fields between pixel electrodes and common electrodes can cause chaos in the electric field, leading to light leakage, which is often mitigated by using a black matrix that decreases the aperture ratio of pixel regions.
Innovation Solution
The introduction of shield electrodes in the same layer as the pixel electrodes, electrically coupled to the common electrode lines, creates a planar electric field that shields the fringe electric field, reducing its impact on liquid crystal molecules and minimizing light leakage while increasing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is used to mitigate light leakage caused by fringe electric fields, then light leakage is reduced, but the aperture ratio of pixel regions decreases
Solution Approach 1:
The patent introduces a shield electrode as an intermediary element between the pixel electrode and the common electrode. This shield electrode, positioned in the same layer as the pixel electrode and electrically coupled to the common electrode line, acts as a mediator to counteract the harmful fringe electric field effects, thereby reducing light leakage without requiring a black matrix that would reduce the aperture ratio
Solution Approach 2:
The patent segments the electrode structure by introducing a shield electrode that is divided into multiple parts: a first shield sub-electrode coupled to the common electrode line, and a second shield sub-electrode coupled to the first shield sub-electrode. This segmentation allows the shield electrode to effectively cover and counteract fringe electric fields in different regions without requiring a continuous black matrix across the entire pixel region, thus maintaining higher aperture ratio
2Stability of the object's composition
If the array substrate uses shield electrodes to reduce light leakage, then light transmittance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the shield electrode function with the existing common electrode line by electrically coupling the first shield sub-electrode to the common electrode line. This merging approach allows the shield electrode to leverage the existing common electrode line structure, reducing the need for completely independent electrode systems and thereby limiting the increase in device complexity while still achieving improved light transmittance uniformity
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 solution effectively reduces light leakage and enhances the uniformity of light transmittance across pixel regions, improving the display's overall performance by maintaining a higher aperture ratio.
Implementation Method 1
The introduction of shield electrodes in the same layer as the pixel electrodes, electrically coupled to the common electrode lines, creates a planar electric field that shields the fringe electric field
Data Source
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AI summary
The present disclosure provides an array substrate and a display panel, where the array substrate includes: a plurality of pixel structures, each of the pixel structures comprises at least one pixel region, wherein a signal wire is provided at a side of the pixel region, and a pixel electrode is provided in the pixel region, a shield electrode being in a same layer as the pixel electrode is provided at a side of the pixel electrode proximal to the signal wire, and the shield electrode is electrically coupled to a common electrode line. The technical solution of the present disclosure provides a shield electrode between the pixel electrode and the signal wire, the shield electrode being disposed in a same layer as the pixel electrode and electrically coupled to the common electrode line, a planar electric field can be formed between the shield electrode and the pixel electrode, the planar electric field can effectively eliminate the fringe electric field formed between the pixel electrode and the signal wire to avoid the influence of the fringe electric field on the liquid crystal molecules, thereby improving the chaos in electric field at the edge of the area of the pixel region between the pixel electrode and the signal wire, and it is beneficial to reduce light leakage and increase the aperture ratio.