Flexible Film Window for Nondestructive ACF Curing Measurement
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Solution Overview
Problem
Existing display devices lack a non-destructive method to measure the degree of cure of anisotropic conductive films bonding printed circuit films to display panels, leading to yield reduction and increased measurement time.
Innovation Solution
A display device with a window portion on the flexible film allows for non-destructive measurement of the anisotropic conductive film's curing status by using a high light transmittance material and an optically opaque insulating resin, enabling the measurement of the curing process without peeling off the printed circuit film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the flexible film is made opaque to ensure structural integrity and protection, then the reliability and protection are improved, but the ability to measure curing status nondestructively deteriorates
Solution Approach 1:
The flexible film is segmented into two distinct regions: a first region with high light transmittance (60% or more) for nondestructive measurement, and a second region with lower light transmittance for structural integrity and protection. This segmentation allows each region to fulfill its specific function without compromising the other.
Solution Approach 2:
Different regions of the flexible film are assigned different optical properties tailored to their specific functions. The first region (measurement area) has high light transmittance to enable curing status measurement, while the second region (protective area) has lower light transmittance to provide structural protection, creating local quality differentiation.
2Measurement precision
If the printed circuit film is peeled off to measure the anisotropic conductive film curing status, then the measurement accuracy is improved, but the productivity and yield deteriorate
Solution Approach 1:
The measurement function is extracted from the protective function by creating a dedicated first region with high light transmittance properties. This extracted measurement region allows curing status assessment without requiring removal of the printed circuit film, thereby maintaining productivity while achieving measurement accuracy.
Solution Approach 2:
The first region of the flexible film acts as an intermediary medium that transmits light from the measurement device to the anisotropic conductive film while the printed circuit film remains in place. This intermediary region enables indirect measurement without direct contact or removal, preserving both measurement accuracy and production efficiency.
3Difficulty of detecting and measuring
If a light transmittance of 60% or more is required for the flexible film to enable measurement, then the measurement capability is improved, but the protection and structural integrity deteriorate
Solution Approach 1:
The flexible film is divided into functional segments: a first region optimized for light transmittance (60% or more) to enable measurement, and a second region optimized for structural protection with appropriate light blocking properties. This segmentation resolves the contradiction by allowing each region to specialize in its primary function.
Solution Approach 2:
The flexible film exhibits spatially varying optical properties, with the first region having high light transmittance quality for measurement purposes and the second region having lower light transmittance quality for protection purposes. This local quality differentiation enables simultaneous achievement of measurement capability and structural reliability.
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
Enables accurate measurement of the anisotropic conductive film's curing status without reducing yield or increasing measurement time, ensuring reliable bonding and efficient production processes.
Implementation Method 1
The flexible film has a light transmittance of 60% or more with respect to a visible light wavelength range
Implementation Method 2
The anisotropic conductive film is prepared through an ultraviolet curing or thermal curing process
Implementation Method 3
The anisotropic conductive film is prepared through an ultraviolet curing or thermal curing process
Data Source
AI summary
A display device includes a display substrate including a display area and a pad area located around the display area, a plurality of light emitting elements located on the display area of the display substrate, a plurality of pads located on the pad area of the display substrate and connected to the plurality of light emitting elements, a flexible film attached to the display substrate, a plurality of lead wires disposed on the flexible film, and an anisotropic conductive film disposed between the display substrate and the flexible film. The anisotropic conductive film is disposed between each of the plurality of pads and a corresponding one of the plurality of lead wires overlapping each other to form an electrical connection therebetween. The flexible film has a light transmittance of 60% or more with respect to a visible light wavelength range.