Display Panel Adhesive Connection Stability Under Pressure
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Solution Overview
Problem
The connection between a printed circuit board and a sensing electrode on a display panel can be disrupted when pressure is applied, causing the conductive tape to detach and preventing normal signal detection due to the stiffness of the printed circuit board and deformation of the display panel.
Innovation Solution
An improved connection structure is implemented using a combination of adhesives, including a conductive tape and a non-conductive tape with a filler, to securely attach the display panel and printed circuit board, enhancing the adhesive force and preventing detachment during pressure application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive tape is used to connect the sensing electrode and printed circuit board, then electrical connection is achieved, but the connection becomes unstable under pressure causing detachment
Solution Approach 1:
The patent uses a composite adhesive structure combining conductive tape with non-conductive adhesive tapes having different adhesive strengths. The first non-conductive adhesive tape has stronger adhesive strength to the display panel than the conductive tape, while the second non-conductive adhesive tape has stronger adhesive strength to the printed circuit board than the conductive tape, creating a composite connection system that prevents detachment under pressure.
2Stability of the object's composition
If the printed circuit board is made stiff for structural stability, then structural integrity is improved, but deformation under pressure prevents proper signal transmission
Solution Approach 1:
The patent segments the adhesive connection into multiple functional layers: conductive tape for electrical connection, first non-conductive adhesive tape for mechanical bonding to display panel, and second non-conductive adhesive tape for mechanical bonding to printed circuit board. This segmentation allows each layer to perform its specific function independently, maintaining structural integrity while enabling proper deformation for signal transmission.
3Ease of operation
If the display panel is made flexible for touch sensitivity, then touch detection capability is improved, but deformation under pressure causes connection disruption
Solution Approach 1:
The patent applies beforehand cushioning by using the first non-conductive adhesive tape with adhesive strength stronger than the conductive tape to the display panel. This pre-established strong mechanical bond compensates for the panel's flexibility and deformation under touch pressure, preventing connection disruption while maintaining touch sensitivity.
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 solution ensures stable signal transmission by maintaining the connection between the sensor and printed circuit board even under pressure, reducing signal interference and enhancing the durability of the display device.
Implementation Method 1
a first adhesive contacting the first pad and the first printed circuit board; and a second adhesive contacting the display panel and the first printed circuit board
Data Source
AI summary
A display device includes: a display panel; a bracket opposite the display panel; a sensing electrode to form a capacitance with the bracket; a first pad connected to the sensing electrode; a first printed circuit board overlapping with the first pad; a first adhesive contacting the first pad and the first printed circuit board; and a second adhesive contacting the display panel and the first printed circuit board.