Friction Roller With Pattern-Variable Module For Liquid Crystal Alignment
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Solution Overview
Problem
Inconsistent alignment grooves on liquid crystal display substrates caused by surface steps lead to stripe formation, affecting the display effect due to varying pressure exerted by friction rollers with fibers of different deformations.
Innovation Solution
A friction roller with a pattern-variable module and controller that adjusts deformation based on surface step information, ensuring consistent groove depths by controlling deformation units radially or through pressure sensing, maintaining uniform pressure across the substrate surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a friction roller with fixed fibers is used to align liquid crystal molecules, then alignment grooves are formed on the substrate surface, but inconsistent groove depths occur due to surface steps causing stripe defects
Solution Approach 1:
The friction roller employs a dynamic fiber layer that can radially expand and contract based on real-time substrate surface detection. When surface steps are detected, the control system adjusts the fiber layer's radial position to maintain consistent contact pressure across varying substrate heights, ensuring uniform alignment groove depths and eliminating stripe defects
Solution Approach 2:
The system incorporates a detection device that continuously monitors substrate surface topography and feeds this information to a control system. The control system processes the surface step data and dynamically adjusts the fiber layer's radial expansion/contraction accordingly, creating a closed-loop feedback mechanism that maintains optimal alignment conditions across the entire substrate surface
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 ensures alignment grooves of consistent depth, reducing stripe formation and enhancing the display effect by maintaining uniform pressure and alignment of liquid crystal molecules.
Implementation Method 1
the fibers on the friction cloth can exert to the substrate surface a pressure perpendicular to the substrate surface and a friction force along the direction in which the friction roller is rolling
Implementation Method 2
a deformation perception layer comprising a plurality of perception units corresponding to the plurality of second deformation units one to one, the second deformation layer and the deformation perception layer successively wrapped outside the inner cylinder. The controller is connected with the deformation perception layer and configured to acquire pressure sensing signals generated by the plurality of perception units according to magnitudes of undergone pressures
Data Source
AI summary
The disclosure discloses a friction roller comprising: a friction roller body comprising an inner cylinder and a pattern-variable module wrapped outside the inner cylinder; and a controller connected with the pattern-variable module. The controller controls the pattern-variable module to deform according to step information of a surface for friction. Also disclosed is a method for using the friction roller. Embodiments of the disclosure enable alignment grooves with the same depth to be formed on the surface for friction by way of the friction roller, thereby reducing stripes on the surface for friction and enhancing the display effect.