Display Substrate Segment Difference Padding Layer
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Solution Overview
Problem
Liquid crystal display panels suffer from 'rubbing mura' due to inconsistent rubbing processes, leading to poor groove formation and impaired display quality, particularly around data lines.
Innovation Solution
A display substrate with a segment difference padding layer in the sealing region, featuring through holes that smooth out fluffs on the rubbing cloth and ensure adhesive strength, eliminating segment differences and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rubbing alignment is performed on the liquid crystal display substrate, then the liquid crystal orientation is maintained, but rubbing mura occurs due to poor consistency of rubbing
Solution Approach 1:
The patent introduces a segment difference padding layer as an intermediary structure between the display region and non-display region. This padding layer includes through holes that act as mediators to smooth out fluffs on the rubbing cloth, ensuring consistent rubbing pressure and groove formation across different regions of the substrate, thereby eliminating rubbing mura while maintaining reliable liquid crystal orientation
Solution Approach 2:
The segment difference padding layer is designed with through holes creating a porous structure. This porous configuration allows the padding layer to effectively comb and smooth fluffs on the rubbing cloth during the rubbing alignment process, ensuring uniform rubbing pressure distribution and consistent groove formation, thus resolving the inconsistency in groove formation while maintaining orientation reliability
2Manufacturing precision
If a segment difference padding layer is applied in the sealing region, then rubbing mura is eliminated, but the manufacturing process becomes more complex
Solution Approach 1:
The segment difference padding layer is applied locally only in the sealing region where segment difference exists, rather than across the entire substrate. This localized application eliminates rubbing mura at the critical sealing area without requiring complex full-substrate modifications, thus improving rubbing alignment consistency while minimizing added process complexity
Solution Approach 2:
The patent segments the substrate into display region and non-display region with the sealing region in between. The segment difference padding layer is specifically applied in the sealing region to address the segment difference issue. This segmentation approach allows targeted treatment of the problem area without complicating the entire manufacturing process
3Manufacturing precision
If the segment difference padding layer includes through holes, then fluffs on the rubbing cloth are smoothed, but adhesive strength may be compromised
Solution Approach 1:
The patent optimizes parameters of the through holes including their diameter, distribution density, and cross-sectional area. By carefully controlling these parameters, the padding layer achieves effective fluff smoothing while maintaining sufficient adhesive strength. The through holes are designed with specific dimensions and patterns that balance the competing requirements of surface smoothing and bonding strength
Data Source
AI summary
The embodiments of the present invention provide a display substrate, a method for manufacturing the same and a liquid crystal display device. The display substrate includes a display region and a non-display region. The non-display region includes at least a sealing region surrounding the display region. The sealing region includes a segment difference padding layer, and the segment difference padding layer includes several through holes. The display substrate, the method for manufacturing the same and the liquid crystal display device provided by the embodiments of the invention can eliminate the mura phenomenon, simplify the process and prevent the resin layer from being peeled off from the substrate.