Bonding Pressure Sheet Inspection for Uniform LED Transfer
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Solution Overview
Problem
Current methods for bonding light emitting elements in display devices lack effective means to ensure uniform pressure application, which is crucial for reducing electrical resistance and achieving optimal bonding, but existing techniques fail to accurately detect and verify uniform pressure distribution.
Innovation Solution
A pressure detection method and system that involves forming a backplane substrate with a light emitting element, disposing a pressure detection sheet, and using a bonding device to apply pressure while photographing the sheet with a high-resolution microscope to detect color-developed areas, allowing for the identification of uniform pressure distribution by analyzing the ratio of color-developed pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure detection sheet is used to monitor bonding pressure, then pressure distribution can be visualized, but the bonding process becomes more complex
Solution Approach 1:
A pressure detection sheet is introduced as an intermediary component between the bonding device and the light emitting element. This sheet contains pressure-sensitive color capsules that change color when pressed, providing visual feedback on pressure distribution without requiring complex electronic sensors or measurement systems. The sheet acts as a mediator that translates mechanical pressure into observable color changes.
Solution Approach 2:
The pressure detection sheet utilizes color-changing capsules that transition from one color to another when subjected to pressure. This allows the bonding pressure distribution to be visualized through color patterns, eliminating the need for complex electronic detection systems. The color change provides immediate, intuitive feedback on whether uniform pressure is applied during bonding.
2Measurement precision
If high-resolution microscope is used to photograph the pressure detection sheet, then color developing area can be precisely detected, but the equipment cost and complexity increase
Solution Approach 1:
The invention replaces complex electronic image analysis systems with a simpler optical approach. A microscope photographs the pressure detection sheet, and the color developing areas are detected by comparing the photographed image with a reference image. This substitution of mechanical/optical methods for electronic processing reduces system complexity while maintaining detection precision.
Solution Approach 2:
The detection process creates a visual copy (photograph) of the pressure detection sheet's color pattern. By comparing this photographic copy with a reference image, the system can precisely detect color developing areas without requiring complex real-time analysis equipment. The copying approach simplifies the detection mechanism while preserving measurement accuracy.
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 enables precise detection of uniform pressure application, ensuring optimal bonding and reduced electrical resistance between light emitting elements and the substrate, thereby improving the performance and reliability of display devices.
Implementation Method 1
The pressure detection sheet may include a first sheet including a color capsule, and a second sheet including a color developer. In the bonding of the light emitting element by pressurizing the pressure detection sheet, a color component of the color capsule may be mixed with the color developer.
Data Source
AI summary
The disclosure provides a pressure detection method of a bonding device and a bonding system. The pressure detection method of a bonding device includes forming a backplane substrate including a light emitting element, disposing a pressure detection sheet on the backplane substrate, transferring the backplane substrate and the pressure detection sheet into a chamber, bonding the light emitting element by pressurizing the pressure detection sheet, photographing the pressure detection sheet, and detecting a color developing area of the pressure detection sheet. In the pressure detection method of the bonding device and the bonding system, it can be inspected whether uniform pressure is applied to a pressure detection sheet.