Flexible Circuit Board Covering Test Pads in Display Substrates
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Solution Overview
Problem
The existing display panel manufacturing process is inefficient due to the need for UV adhesive coating of test pads to prevent corrosion, which reduces production efficiency and increases thickness.
Innovation Solution
A display substrate design where a flexible circuit board covers the test pads, eliminating the need for UV adhesive coating and preventing corrosion, thereby improving production efficiency and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If test pads are coated with UV adhesive to prevent corrosion, then reliability of test points is improved, but productivity is reduced and thickness increases
Solution Approach 1:
The protective function previously performed by UV adhesive coating is merged into the flexible circuit board structure itself. The flexible circuit board is designed to cover and protect the test pads while providing structural support, eliminating the need for separate UV adhesive coating process.
Solution Approach 2:
The UV adhesive coating process is extracted and removed from the manufacturing process. The protective function is achieved through the flexible circuit board's physical coverage rather than chemical coating, thereby eliminating the coating step and improving productivity.
2Reliability
If test pads are coated with UV adhesive to prevent corrosion, then reliability of test points is improved, but thickness of display substrate increases
Solution Approach 1:
The protective function previously requiring additional UV adhesive layer is merged into the flexible circuit board's inherent structure. The flexible circuit board provides both mechanical support and corrosion protection without requiring additional coating thickness.
Solution Approach 2:
The flexible circuit board acts as a thin film structure that provides protective coverage over the test pads. This flexible protective layer prevents corrosion while maintaining minimal thickness compared to rigid UV adhesive coatings.
3Reliability
If UV adhesive coating process is applied to test pads, then corrosion protection is achieved, but process complexity increases
Solution Approach 1:
The protective function is merged into the flexible circuit board assembly process. By integrating test pad coverage into the flexible circuit board design, the separate UV adhesive coating step is eliminated, simplifying the overall manufacturing process.
Solution Approach 2:
The UV adhesive coating process is extracted and removed from the manufacturing sequence. Protection is achieved through the flexible circuit board's physical presence rather than chemical treatment, reducing process complexity.
Data Source
AI summary
A display substrate, a display panel including the display substrate and a display device including the display panel are provided. The display substrate comprises a flexible circuit board and test pads, wherein the flexible circuit board covers an area of the test pads. In the aforesaid display substrate, the flexible circuit board covers the area of the test pads, so that test points on the test pads can be prevented from contacting the outside, and corrosion of the test points and signal abnormity in signal lines resulting therefrom during testing are prevented; compared with the prior art, the process of coating the test pads with UV adhesive is omitted, thus the process flow is reduced, and the production efficiency and the productivity are improved; moreover, the thickness of the display substrate can be reduced, which is conducive for the display panel including the display substrate to be lighter and thinner.