Display Bonding Test Pad Layout for FPCB Connection Quality
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Solution Overview
Problem
As display apparatuses increase in resolution, the precise bonding between the flexible circuit board and the display panel, as well as the printed circuit board, becomes crucial for accurate electrical signal transmission, but existing methods lack effective quality testing of these bonds.
Innovation Solution
A display apparatus is designed with specific pad configurations and wiring connections that allow for the application of a test current to check the bonding quality between the flexible circuit board and the display panel, and between the flexible circuit board and the printed circuit board, using a system of panel test pads, PCB test pads, and integrated circuit test pads to facilitate electrical connectivity and resistance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the resolution of display apparatuses increases, then the display quality is improved, but the bonding precision requirement between flexible circuit board and display panel increases
Solution Approach 1:
The patent implements preliminary bonding quality testing by incorporating test pads and test current paths into the bonding structure before final product completion. This allows bonding quality to be verified in advance, preventing defects from reaching the final product stage.
Solution Approach 2:
The patent introduces an intermediary testing mechanism using test pads and measurement circuits that mediate between the bonding interface and the final product. This intermediary system enables indirect measurement of bonding quality through electrical resistance measurements without directly interfering with the bonding process.
2Reliability
If the bonding precision between flexible circuit board and display panel is improved, then the electrical signal transmission accuracy is improved, but the testing complexity increases
Solution Approach 1:
The patent extracts the testing function from the main product structure by separating test pads and measurement circuits as distinct, dedicated components. This extraction allows testing to be performed independently without affecting the main product functionality, simplifying the overall system while enabling comprehensive testing.
Solution Approach 2:
The bonding structure itself provides the testing capability through integrated test pads and measurement paths that are part of the bonding assembly. The system tests itself using its own electrical pathways, eliminating the need for external complex testing equipment.
3Reliability
If the bonding quality testing is implemented, then the reliability of electrical signal transmission is improved, but the device complexity increases
Solution Approach 1:
The patent merges the testing function with the bonding structure by integrating test pads and measurement circuits into the existing bonding assembly. This combining approach allows testing capabilities to be added without creating separate, independent testing systems, thereby minimizing the increase in device complexity.
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 design enables reliable testing of bonding quality, ensuring accurate electrical signal transmission by identifying and correcting any issues in the bonding process, thereby enhancing the overall performance of the display apparatus.
Implementation Method 1
When a test current is applied to the first input terminal, the first PCB pad, the test current may flow through a current path including the first panel pad, the second panel pad, and the second PCB pad
Data Source
AI summary
A display apparatus includes a display panel including a panel test pad portion, a printed circuit board including a PCB test pad portion and test terminals, and a flexible circuit board including a first transmission pad portion electrically connected to the panel test pad portion and a second transmission pad portion electrically connected to the PCB test pad portion, wherein the panel test pad portion includes first to third panel pads, the PCB test pad portion includes a first PCB pad electrically connected to the first panel pad, second and third PCB pads electrically connected to the second panel pad, and a fourth PCB pad electrically connected to the third panel pad, and the test terminals include first and second input terminals respectively electrically connected to the first and second PCB pads, and first to third measurement terminals respectively electrically connected to the second to fourth PCB pads.