Bent Display Substrate Electrical Coupling via Conductive Adhesive
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Solution Overview
Problem
The existing display devices with touch screens face contact failures due to size deviations in conductive balls used for electrical coupling between the touch screen and signal input terminals, leading to unreliable connections.
Innovation Solution
The display device design includes a first substrate with a display area and a non-display area that is bent to electrically couple connection pads with touch pads, using conductive balls of specific sizes and adhesive layers to ensure consistent contact, reducing the likelihood of contact failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the size of the conductive ball is increased to correspond to the distance between the touch screen and the substrate, then the electrical coupling between the touch screen and signal input terminal is improved, but the deviation in size of the conductive ball is increased, causing contact failure
Solution Approach 1:
The patent changes the physical state and material composition of the conductive element from discrete conductive balls to a conductive adhesive layer with controlled viscosity and conductivity parameters. This allows the conductive material to flow and adapt to varying distances between substrates, maintaining reliable electrical coupling without the size deviation problems of fixed-size conductive balls
Solution Approach 2:
The patent introduces a conductive adhesive layer as an intermediary material between the touch screen and substrate. This adhesive layer serves as a flexible mediator that can accommodate distance variations and positioning tolerances, transferring electrical signals reliably without the rigid size constraints of conductive balls
2Adaptability or versatility
If the touch screen is disposed at a position spaced apart from the substrate, then the touch screen can be separately attached, but the conductive ball size must be precisely controlled to prevent contact failure
Solution Approach 1:
The patent transforms the conductive connection from fixed-size discrete balls to a viscous conductive adhesive layer that can flow and conform to different positioning scenarios. This parameter change in material state enables flexible touch screen positioning while eliminating the need for precise conductive ball size control
Solution Approach 2:
The conductive adhesive layer acts as a flexible thin film that can deform and adapt to positioning variations between the touch screen and substrate. This flexibility allows the touch screen to be disposed at spaced positions without requiring precise conductive element dimensions
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 configuration reduces the size deviation of conductive balls, preventing contact failures and ensuring reliable electrical coupling between the touch screen and signal input terminals, thereby enhancing the stability and performance of the display device.
Implementation Method 1
the touch screen and the signal input terminal may be electrically coupled to each other by an ACF (Anisotropic conductive film) including a conductive ball
Implementation Method 2
using conductive balls of specific sizes and adhesive layers to ensure consistent contact
Data Source
AI summary
A display device includes a first substrate and a second substrate. The first substrate includes a first base substrate, a drive layer, and an optical layer, and is divided into a display area, and a non-display area. A first connection pad and a second connection pad are disposed in the non-display area. The second substrate is disposed facing the first substrate, and includes: a second base substrate including a sensing area, and a non-sensing area; and a touch sensor disposed on the second base substrate. The touch sensor includes a touch sensing electrode, a touch pad, and a sensing line electrically coupling the touch sensing electrode with the touch pad. The non-display area of the first substrate is bent so that the first connection pad is electrically coupled with the second connection pad, and the second connection pad is electrically coupled with the touch pad.