Display Substrate Slit Patterns for Rubbing Alignment Control
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Solution Overview
Problem
The rubbing alignment process in display substrate fabrication often results in defects such as Mura due to morphological differences in the substrate, leading to poor alignment and reduced quality, especially in high-end products like ADS panels.
Innovation Solution
Incorporating slit patterns arranged in the rubbing direction between pixels on functional layers of the display substrate, such as on the gate metal layer, semiconductor lines, or passivation layers, to guide the rubbing cloth and maintain alignment during the rubbing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional rubbing process is used without slit patterns, then manufacturing process is simple, but rubbing alignment is poor and Mura defects occur
Solution Approach 1:
The substrate surface is segmented into multiple regions by introducing slit patterns between pixel regions. These slits divide the continuous substrate surface into distinct segments that guide the rubbing cloth movement, ensuring consistent rubbing direction and preventing alignment deviations that cause Mura defects.
Solution Approach 2:
Slit patterns serve as intermediary structures between pixel regions. These slits act as physical guides that mediate the interaction between the rubbing cloth and substrate, ensuring the rubbing cloth follows the intended path and maintains proper alignment throughout the rubbing process.
2Reliability
If substrate morphology is uniform, then rubbing alignment is good, but various defects (Peripheral block, V-Block, Cell pollution) still occur due to external factors
Solution Approach 1:
Slit patterns are introduced in advance to prevent alignment deviations before they occur. By providing physical guides on the substrate surface, the rubbing cloth is pre-directed to follow the correct path, preventing Peripheral block, V-Block, and Cell pollution defects that would otherwise occur due to misalignment or external interference during the rubbing process.
3Manufacturing precision
If rubbing alignment is improved by process optimization, then picture quality improves, but material and equipment waste increases and quality problems persist
Solution Approach 1:
The slit patterns are formed on the substrate during the fabrication process, establishing alignment guides before the rubbing process begins. This preliminary action ensures that subsequent rubbing operations proceed with proper alignment from the start, preventing defects that would lead to material waste and rework, thereby improving both picture quality and manufacturing efficiency.
Data Source
AI summary
A display substrate, a method for fabricating the same, and a display device are disclosed. The display substrate comprises a plurality of pixels; and a plurality of slit patterns, which are arranged between at least two of the plurality of pixels, and comprise a plurality of slits arranged in a rubbing direction. Slit patterns are provided, and each of slit patterns comprises slits in the rubbing direction. Thus, during a rubbing alignment process, the slit patterns can guide a rubbing cloth to move in the rubbing direction. Accordingly, the alignment of the rubbing cloth is prevented from changing in the rubbing process, a good alignment layer is formed, rubbing Mura is avoided, and the lifetime of the rubbing cloth is extended.