Dot Array Alignment Mark Reduces Rubbing Mura
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Solution Overview
Problem
The Mura phenomenon, caused by the rubbing alignment process in liquid crystal display devices, particularly in the fixing region of the display substrate where alignment marks are located, is difficult to remove and adversely affects the display effect, with prior solutions offering limited improvement and resource wastage.
Innovation Solution
A display substrate with a dot array alignment mark that reduces the step or height difference between the alignment mark and surrounding areas, minimizing adverse influences on rubbing alignment and eliminating Mura by optimizing dot arrangement, spacing, and shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional alignment mark is used in the fixing region, then the alignment mark can be clearly formed, but rubbing Mura phenomenon occurs and adversely affects display quality
Solution Approach 1:
The alignment mark is segmented into a dot array structure, where multiple discrete dots are arranged in a pattern. This segmentation reduces the continuous height difference between the alignment mark and surrounding areas, minimizing the adverse effect on rubbing alignment while maintaining alignment mark functionality for positioning and measurement purposes
Solution Approach 2:
The dot array structure creates local variations in the alignment mark region, where each dot provides localized alignment reference while the spaces between dots reduce the overall height difference. This local quality approach allows the alignment mark to function effectively without causing widespread rubbing Mura phenomenon in the fixing region
2Object-affected harmful factors
If the rubbing cloth lifetime is reduced to improve rubbing Mura, then some improvement in display quality is achieved, but resource waste increases and improvement effect is not ideal
Solution Approach 1:
The alignment mark is designed with a dot array structure that preliminarily reduces the height difference before the rubbing alignment process. This preliminary action prevents the generation of severe rubbing Mura phenomenon, allowing the rubbing cloth to maintain its effectiveness for longer periods without requiring frequent replacement
Data Source
AI summary
The present disclosure provides a display substrate, a display panel and a display device. The display substrate includes a base substrate and at least one layer formed on the base substrate, and the layer is formed with an alignment mark, which includes a dot array composed of a plurality of dots. With such dot array composed of the plurality of dots, a step or height difference between the alignment mark and portions of the layer around the alignment mark can be reduced, and adverse influence on the rubbing alignment caused by alignment mark can be reduced or eliminated, thereby reducing or eliminating rubbing Mura in the region where the alignment mark is located.