Glass Sheet Stress Control for LCD Light Leakage
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Solution Overview
Problem
Glass sheets used in LCDs often suffer from distortion due to residual stress, leading to light leakage and defects, especially as sheet size increases, causing differences in dimensions between front and rear glass substrates.
Innovation Solution
A method and apparatus for glass manufacturing that involve determining stress values and light leakage degrees in glass sheets, modifying stress values based on leakage data, and adjusting manufacturing process conditions to reduce stress and improve sheet quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If glass sheets are manufactured with larger sizes to meet display demands, then productivity and market requirements are improved, but residual stress causes increased distortion and light leakage
Solution Approach 1:
The patent applies preliminary action by performing stress measurement and light leakage evaluation on glass sheets during the manufacturing process, before final cutting and assembly. This allows stress distribution to be mapped and process conditions to be adjusted in advance, preventing distortion issues from developing in the final product. The control device measures stress values at multiple locations and uses this information to modify manufacturing parameters before the glass sheet is cut into smaller components.
Solution Approach 2:
The patent implements feedback control by continuously monitoring stress values and light leakage degrees, then using this information to adjust manufacturing process conditions. The control device receives stress measurement data, determines light leakage degrees based on polarization display characteristics, modifies stress values accordingly, and feeds this information back to adjust the glass manufacturing process. This closed-loop feedback system enables real-time optimization of stress distribution in large-sized glass sheets.
2Ease of manufacture
If conventional glass manufacturing processes are used, then manufacturing simplicity is maintained, but residual stress leads to light leakage and screen defects
Solution Approach 1:
The patent introduces feedback control into the glass manufacturing process by measuring stress values at multiple locations on the glass sheet, determining light leakage degrees based on polarization display characteristics, and using this information to adjust manufacturing parameters. This feedback mechanism enables the system to automatically compensate for stress-induced light leakage without requiring complete process redesign, thus maintaining relative manufacturing simplicity while eliminating the harmful light leakage effect.
Solution Approach 2:
The patent applies parameter changes by modifying manufacturing process conditions based on measured stress values. The control device adjusts parameters such as heating temperature, cooling rate, or annealing conditions according to the stress distribution map and light leakage degree measurements. This dynamic parameter adjustment allows the manufacturing process to adapt to variations in stress distribution, effectively reducing light leakage while maintaining process feasibility.
3Object-affected harmful factors
If stress measurement and control are implemented, then light leakage is reduced, but manufacturing process complexity increases
Solution Approach 1:
The patent uses feedback control to manage the complexity of stress measurement and control. By implementing a systematic feedback loop that automatically processes stress measurement data, calculates light leakage degrees, and adjusts manufacturing parameters, the patent reduces the need for complex manual interventions. The control device integrates multiple functions (stress measurement, light leakage calculation, parameter modification) into a unified automated system, making the enhanced process more manageable despite the added complexity.
Solution Approach 2:
The patent applies universality by designing a control device that performs multiple functions: measuring stress values at multiple locations, calculating light leakage degrees based on polarization display characteristics, modifying stress values, and adjusting manufacturing parameters. This multi-functional integrated system reduces overall process complexity compared to having separate systems for each function, as the control device serves as a universal platform that coordinates all stress control activities throughout the manufacturing process.
Data Source
AI summary
A glass manufacturing method. A plurality of stress values in a glass sheet are determined in a plurality of locations of the glass sheet respectively. A plurality of light leakage degrees are determined in the plurality of locations of a polarization-based display provided with the glass sheet, when the polarization-based display is in a state to block light transmissions. The plurality of determined stress values are modified based on the plurality of determined light leakage degrees. At least one additional glass sheet is manufactured in a glass sheet manufacturing process with at least one process condition of the glass sheet manufacturing process being adjusted based on the plurality of modified stress values.