Rubbing Roller Deformation Compensation for TFT-LCD Homogeneity
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Solution Overview
Problem
The deformation of rubbing rollers during the rubbing process in TFT-LCD display technology leads to display defects such as rubbing mura and rubbing block, which cannot be eliminated by regulating the pressing amount, affecting yield rate and display quality.
Innovation Solution
A rubbing roller design featuring a cylindrical roller mandrel with a rubbing fabric that has a decreasing distance from the axial line, allowing for deformation compensation through variations in the roller mandrel, rubbing fabric, and adhesive tape, ensuring uniform pressing and improved homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional rubbing roller with uniform structure is used, then the rubbing process can be performed, but deformation occurs during rubbing leading to rubbing mura and rubbing block defects
Solution Approach 1:
The roller mandrel is designed with non-uniform cross-sectional dimensions along its axial direction, creating local structural variations. Specifically, the cross-sectional dimensions vary to provide deformation compensation, with different sections having different dimensional characteristics to counteract rubbing-induced deformation and ensure uniform pressing throughout the rubbing process
Solution Approach 2:
The cross-sectional dimensions of the roller mandrel are deliberately varied along the axial direction rather than maintaining constant dimensions. This parameter change in the roller structure allows for compensation of deformation that occurs during rubbing, preventing pressing amount variation and the associated display defects
2Manufacturing precision
If the pressing amount is regulated to compensate for deformation, then some defects may be reduced, but rubbing homogeneity cannot be achieved due to deformation variation
Solution Approach 1:
The roller mandrel incorporates local structural variations through non-uniform cross-sectional dimensions. This local quality variation is designed to compensate for the non-uniform deformation that occurs during rubbing, ensuring that the pressing amount remains uniform across different regions of the rubbing surface
3Ease of manufacture
If a uniform cross-sectional roller mandrel is used, then manufacturing is simpler, but deformation compensation is insufficient leading to pressing amount variation
Solution Approach 1:
The roller mandrel is designed with local structural variations through non-uniform cross-sectional dimensions along its axial direction. While this increases manufacturing complexity compared to a uniform structure, it provides the necessary deformation compensation to achieve uniform pressing amount and rubbing homogeneity
Data Source
AI summary
A rubbing roller is disclosed, which includes a cylindrical roller mandrel and a rubbing fabric in close contact with an outer surface of the roller mandrel; the rubbing fabric includes a first end face, an outer side face and a second end face in this order along an axial direction of the roller mandrel, and the first end face and the second end face are connected through the outer side; the outer side face of the rubbing fabric, at the first and second end faces, has a distance d1 from an axial line of the roller mandrel; the outer side face of the rubbing fabric, at a first cross section between the first and second end faces, has a distance d2 from the axial line of the roller mandrel, and d1>d2.