Camera Module Lens Hole Guide for LCD Substrate Drilling
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Solution Overview
Problem
The challenge in manufacturing liquid-crystal display (LCD) devices with integrated camera modules is the risk of substrate damage during hole drilling, particularly due to inaccurate thickness measurements and the need for precise drilling through multiple transparent layers with different refractive indexes, which can lead to over-drilling, under-drilling, and surface roughness.
Innovation Solution
The solution involves using a confocal sensor with a measurement pattern to accurately measure the substrate thickness, forming a groove, attaching a glass core, and separating it to create a lens hole, while a lens hole guide minimizes substrate damage and supports the camera module insertion, reducing defects and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a drill or similar equipment is used to form a lens hole in the array substrate, then the camera module can be integrated into the LCD device, but the substrate may be damaged during the drilling process due to inaccurate thickness measurements
Solution Approach 1:
The patent applies preliminary action by measuring the substrate thickness at the lens hole formation location before drilling begins. This advance measurement allows the drilling process to be adjusted based on actual thickness data, preventing both over-drilling and under-drilling that could damage the substrate or fail to accommodate the camera module.
Solution Approach 2:
The patent replaces the conventional mechanical drilling method with a combination of precision measurement (confocal sensor) and controlled material removal. The measurement system provides real-time feedback about substrate thickness, allowing the drilling process to be dynamically adjusted, thus substituting blind mechanical drilling with a measured and controlled process.
2Adaptability or versatility
If the substrate thickness is measured inaccurately due to multiple transparent layers with different refractive indexes, then the desired hole depth cannot be achieved, leading to over-drilling or under-drilling
Solution Approach 1:
The patent introduces a confocal sensor as an intermediary measurement tool that can accurately measure substrate thickness through multiple transparent layers with different refractive indexes. This sensor acts as a mediator between the measurement system and the substrate, providing accurate thickness data despite the optical challenges posed by the layered transparent structure.
Solution Approach 2:
The patent addresses measurement inaccuracies by changing the measurement parameters - using a confocal sensor that can focus through transparent layers with different refractive indexes. This allows accurate depth measurement by adjusting the focal plane to the specific location where the lens hole needs to be formed, overcoming the optical interference caused by multiple transparent layers.
3Length of moving object
If the substrate is drilled to achieve minimal thickness for the LCD device, then the overall device thickness is reduced, but the substrate becomes more susceptible to damage during drilling
Solution Approach 1:
The patent applies preliminary action by measuring the exact substrate thickness at the drilling location before the drilling process begins. This advance knowledge allows the drilling parameters to be precisely adjusted, enabling minimal substrate removal while maintaining structural integrity, thus achieving thin device profile without compromising substrate strength.
Solution Approach 2:
The patent implements feedback by using real-time thickness measurement data from the confocal sensor to adjust the drilling process. The measurement system provides continuous feedback about the substrate thickness, allowing the drilling depth and speed to be dynamically controlled, thus removing only the necessary amount of material while preserving substrate strength.
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
This method effectively reduces substrate damage, minimizes defects, and allows for precise camera module integration, maintaining the LCD's minimal thickness and optimal functionality.
Implementation Method 1
measuring a thickness of an array substrate with a confocal sensor by using a measurement pattern on the array substrate
Data Source
AI summary
A liquid-crystal display (LCD) device includes: an array substrate on which a sub-pixel is disposed; a color filter substrate on which a color filter corresponding to the sub-pixel is disposed; and a liquid-crystal layer between the array substrate and the color filter substrate. The array substrate comprises a lens hole, the color filter substrate comprises a lens hole guide, and a diameter of the lens hole is smaller than an inner diameter of the lens hole guide.