Rubbing Roller Opening for Uniform LCD Polyimide Orientation
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Solution Overview
Problem
The existing rubbing processes for liquid crystal display (LCD) apparatuses often result in non-uniform polyimide layer orientation due to end portions or seams of the rubbing cloth, leading to image quality deterioration and potential scratches from impurities.
Innovation Solution
A rubbing apparatus with a circumferentially opening portion on the rubbing roller, a groove for reduced pressure, and an elastic member to ensure uniform rubbing and impurity absorption, preventing image quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a rubbing cloth surrounds the entire circumferential surface of the rubbing roller, then the rubbing coverage is maximized, but end portions or seams of the rubbing cloth cause non-uniform rubbing and image quality deterioration
Solution Approach 1:
The circumferential surface of the rubbing roller is segmented into two functional zones: a rubbing section covered by the rubbing cloth and a non-rubbing section (opening portion) left uncovered. This segmentation allows the rubbing cloth to cover only the necessary area without its end portions or seams contacting the polyimide layer, thus maintaining uniform rubbing quality while still providing adequate rubbing coverage.
2Force
If the rubbing cloth is tightly stretched around the rubbing roller, then rubbing intensity is increased, but impurities generated during rubbing cannot be removed and may cause scratches
Solution Approach 1:
The opening portion on the rubbing roller serves to extract or remove impurities generated during the rubbing process. By providing an uncovered section, impurities can be discharged from between the rubbing cloth and the polyimide layer, preventing their accumulation and subsequent causation of scratches on the LCD panel.
3Stability of the object's composition
If the rubbing roller is completely covered by rubbing cloth, then rubbing uniformity is maintained, but the structure becomes complex and harder to clean
Solution Approach 1:
The rubbing roller structure is segmented into a rubbing section and a non-rubbing opening portion. This simple segmentation reduces device complexity by eliminating the need for complete cloth coverage while maintaining rubbing uniformity through the properly designed rubbing section. The opening portion also facilitates easier cleaning and maintenance.
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 solution effectively prevents image quality deterioration by ensuring uniform rubbing and impurity removal, maintaining high image quality in LCDs.
Implementation Method 1
A pressure in the groove portion may be less than a pressure outside of the rubbing roller
Data Source
AI summary
A rubbing apparatus including a rubbing roller including an opening portion at a region of a circumferential surface of the rubbing roller, an outlet portion connected to the opening portion and open to an outside of the rubbing roller, and a groove portion connected to the opening portion and penetrating into the rubbing roller along the opening portion; and a rubbing cloth substantially surrounding the circumferential surface of the rubbing roller.