Auxiliary Retaining Wall for Display Panel Ion Control
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Solution Overview
Problem
Existing liquid crystal display panels face issues with image sticking due to impurity ions precipitated by support members, which are attracted to the display area by electric fields, leading to reduced display quality.
Innovation Solution
A display panel design featuring an auxiliary retaining wall with specific sub-portions and configurations between substrates, including first, second, and third retaining walls, strategically positioned to avoid leads and reduce ion precipitation, thereby minimizing image sticking and ensuring display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If support members are symmetrically disposed centering on a center of the substrate to maintain uniformity of cell thickness, then cell thickness uniformity is improved, but impurity ion precipitation increases leading to image sticking
Solution Approach 1:
The patent applies asymmetry by positioning the support member offset from the center of the substrate toward the bonding area. This asymmetric placement moves the support member away from the display area center, reducing the concentration of impurity ions in the display area while maintaining cell thickness uniformity through strategic positioning near the bonding region where electric fields are present.
2Manufacturing precision
If support members are placed near bonding area leads to maintain cell thickness, then cell thickness control is improved, but electric field attraction of impurity ions to display area increases
Solution Approach 1:
The patent introduces a groove structure as an intermediary element between the support member and the display area. The groove, with specific depth and width parameters, acts as a barrier that prevents impurity ions precipitated by the support member from migrating into the display area, thus mediating between the need for cell thickness control and the harmful effect of ion attraction.
3Object-generated harmful factors
If multiple retaining walls are added to prevent ion precipitation, then image sticking is reduced, but device complexity increases
Solution Approach 1:
The patent segments the retaining wall structure into multiple functional components: a support member for cell thickness control, a groove structure for ion barrier function, and optional additional retaining walls at specific positions. This segmentation allows each component to perform its specific function efficiently, reducing image sticking while maintaining manageable device complexity through modular design.
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 auxiliary retaining wall effectively reduces impurity ion precipitation in the display area, addressing image sticking issues and enhancing display quality by avoiding ion attraction from electric fields, thus maintaining uniformity and improving the overall display effect.
Implementation Method 1
an auxiliary retaining wall located between the first and second substrates in an edge area of a facing portion of the first and second substrates
Implementation Method 2
A thickness of the liquid crystal layer (i.e., cell thickness), which has a significant influence on the structure and display uniformity of the liquid crystal panel, is mainly controlled by a spacer between the array substrate and the color filter substrate
Data Source
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AI summary
The present disclosure provides a display panel and a display device. The display panel includes: a first substrate; a second substrate in a superposed arrangement with the first substrate; and an auxiliary retaining wall located between the first and second substrates in an edge area of a facing portion of the first and second substrates. The auxiliary retaining wall includes a first retaining wall having a first sub-portion and a second sub-portion disposed opposite to each other, the second substrate comprises a bonding area outside of and adjoined by the facing portion, and the first and second sub-portions are located in areas corresponding to two opposite edges adjacent to an edge where the bonding area is located, respectively.